2024-03-29T13:31:01Z
https://publicaciones.eafit.edu.co/index.php/index/oai
oai:ojs.publicaciones.eafit.edu.co:article/53
2018-12-13T16:21:43Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/53
2018-12-13T16:21:43Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 11-32
One hundred and fyfty years of combustion of fossil hydrocarbons: the emergent alternatives
Laine, Jorge; Instituto Venezolano de Investigaciones Científicas (IVIC)
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/53
combustion
fossil hydrocarbons
petroleum
energy alternatives
bioenergy
es_ES
After one hundred fifty years of drilling first commercial petroleum wells that led to the intensive use of liquid fuels to move transport vehicles, we are arriving at the peak of the world-wide petroleum reserves. Yet, we still have a good portion for spending, with the hope that the consequences will be better than in the first part, which has implied several wars and deteriorations of the environment. This assay brings a review about the history of fossil fuels and with the prospective of the emergent energetic alternatives, placing emphasis on bioenergy as an alternative for the transition between the actual combustion age and the new age of clean energy.PACS: 89.30.A-, 88.20.D-, 88.20.Yq
oai:ojs.publicaciones.eafit.edu.co:article/54
2018-12-13T16:21:42Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/54
2018-12-13T16:21:42Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 33-48
The relation between Puelche wind and the occurrence of forest fires in Bío Bío region, Chile
Inzunza, Juan Carlos; Universidad de Concepción
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/54
Puelche wind
forest fires
correlation coefficients
statistical tests
fire frequency
es_ES
This paper presents a study of the relation between Puelche wind and forest fires in the Bío Bío Region, Chile. To establish a relationship between Puelche wind and forest fire generation, different data analysis methods and statistics test were applied. The relation between the total number of fires in the season and the days with Puelche wind were not statistically significant. When analyzing daily averages of fires produced with and without Puelche wind for each season, the highest daily fire occurrence values were found when there is Puelche wind, indicating that this event produces a strong effect on the daily occurrence of fires since these increased by 90% in comparison to the days without Puelche wind. The results of the difference between the number of fires with and without Puelche wind with respect to the average number of total fires indicate that the days with Puelche wind surpass both the total and the average values for days without Puelche wind, confirming the strong effect that a Puelche wind day has on forest fires. The greatest number of fires produced with Puelche wind occurs in the Province of Concepción. This Province is the most affected by Puelche wind conditions despite having the smallest surface area for the region studied. Still, it is the most populous province of the region and has the greatest surface area with forests and plantations with respect to its size. Consequently, Puelche wind is a factor that increases the occurrence of forest fires and favors their propagation.PACS: 92.60.Gn, 92.60.WcMSC: 70C20
oai:ojs.publicaciones.eafit.edu.co:article/55
2018-12-13T16:21:41Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/55
2018-12-13T16:21:41Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 49-74
Characterization of physical parameters of the terminals of container of Spanish harbor system
González-Cancelas, Nicoletta; Universidad Politécnica de Madrid
Camarero Orive, Alberto; Universidad Politécnica de Madrid
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/55
spanish port system
container terminals
port planning and operation
physical parameters of operation of seaports
port operating ratios
es_ES
The widespread use of management and operating ratios taken from international literature that do not conform to the reality of the Spanish port system makes it difficult to plan and manage the operation of Spanish container terminals. This is due to the lack of characterization of the physical parameters of the container terminals necessary for the operation. Container terminals in the Spanish port system is very heterogeneous and can not be characterized from international operating ratios, so we need a proper study to obtain general Spanish stage container port. The contribution of this article in the field of exploitation is characterized port Spanish container terminals port system from the values taken physical parameters (depth, size, number of cranes, etc´etera). Basic operation of a terminal, allowing to know the reality of the Spanish port system. This study allows us to characterize, at present, the main physical parameters of operation of container terminals by establishing a management and operating ratios own reality characteristic of the port system in Spain that no previous study reported to date.PACS: 89.40.-aMSC: 62-07, 90B06
oai:ojs.publicaciones.eafit.edu.co:article/56
2018-12-13T16:21:40Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/56
2018-12-13T16:21:40Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 75-92
Job Shop problem solution with an intelligent agent
Castrillón, Omar Danilo; Universidad Nacional de Colombia, Manizales
Giraldo, Jaime Alberto; Universidad Nacional de Colombia, Manizales
Sarache, William Ariel; Universidad Nacional de Colombia, Manizales
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/56
makespan time
Idle time
intelligent agents
production sequencing
Job Shop
evolutionary algorithms
multiobjective optimization
es_ES
In this paper, is defines a new and effective methodology based on intelligent agents for production sequencing Job Shop Environments; especially for small and medium enterprises in the metal mechanics sector, where these techniques have not been employed , due to the high resistance to change. This work is developed in two phases. In the first one, the different techniques used are defined. In the second step, statistical tests are executed in order to determine the approximation percentage solutions’ to the optimal or sub optimal solution. This work’s results show that the intelligent agents techniques don’t produce an optimal result every single time; but in few seconds, these techniques, can find sub optimal solutions with an approximation of 97.81% and 90.43%, to the optimal or sub optimal solution, in the variables total time process and total idle time, respectively. This contrasts with the little effectiveness of traditional techniques.MSC: 68Txx, 68Uxx
oai:ojs.publicaciones.eafit.edu.co:article/57
2018-12-13T16:21:39Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/57
2018-12-13T16:21:39Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 93-106
Product of independent random variables involving inverted hypergeometric function type I variables
Zarrazola, Edwin; Universidad de Antioquia
Nagar, Daya Krishna; Universidad de Antioquia
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/57
appell's first hypergeometric function
beta distribution
Gauss hypergeometric function
Humbert’s confluent hypergeometric function
product
transformation
es_ES
The inverted hypergeometric function type I distribution has the probability density function proportional to [formula] where 2F1 is the Gauss hypergeometric function. In this article, we derive the probability density function of the product of two independent random variables having inverted hypergeometric function type I distribution. We also consider several other products involving inverted hypergeometric function type I, beta type I, beta type II, beta type III, Kummer-beta and hypergeometric function type I variables.MSC: 33Cxx
oai:ojs.publicaciones.eafit.edu.co:article/58
2018-12-13T16:21:37Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/58
2018-12-13T16:21:37Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 107-132
Model Bone of Komarova Implementation for the sensitivity study of the process of remodelling bony before changes in local factors
Fonseca-Velásquez, Aldemar; Universidad Distrital Francisco José de Caldas, Bogotá
Garzón–Alvarado, Diego Alexander; Univesidad Nacional de Colombia, Bogotá
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/58
remodeling
compact bone
bone metastasis
osteoclast
osteoblast
osteoprotegerin
PTH
TGF
es_ES
In this article the cellular level model of bone remodeling implementation raised by Komarova is carried out, using like tool a functional block diagram. The objective of this implementation is to make an analysis of sensitivity with respect to the variation of the model parameters and to determine the influence of the paracrine and autocrine factors in the osteoclasts and osteoblasts formation. The model was implemented in the commercial package Simulink with Matlab R2007b. We found that each parameter has a rank of determined operation and that outside him, the stability is lost and they establish gains or losses of bony mass that can be attributed to systemics abnormalitys of the bones. This work constitutes an improve about bony remodeling thanks to, unlike previous works, it includes variations of the own parameters of the remodeling process that takes to possible alterations of the bony metabolism processes, which constitutes a departure point for the study of diseases and alterations of the density of the bone, and allows to start the modeled of new diseases related to the bones, like, the bone metastasis. Then, this study is an improve with respect to the works previously presented and can explain phenomena of metastasis, and metabolic alterations like the described ones in Manolagas work.PACS: 87.85.gj
oai:ojs.publicaciones.eafit.edu.co:article/60
2018-12-13T16:21:36Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/60
2018-12-13T16:21:36Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 155-170
Mechanical and thermal properties optimization of a synthetic agglomerate by using the Taguchi Method
Bedoya Hincapié, C. M.; Universidad Nacional de Colombia, Manizales
Pineda–Gómez, P.; Universidad Nacional de Colombia, Manizales
Rosales Rivera, A.; Universidad Nacional de Colombia, Manizales
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/60
agglomerate
rice husk
vegetable fibers
thermal stability
mechanical properties
es_ES
In this work, the experimental design of Taguchi model was applied in order to obtain the most appropriate parameters to elaborate an agglomerate material which presents a good mechanical and thermal behavior. The raw materials used were rice husk, common clay, sand and aloe gel. The importance of the development of the synthetic agglomerates is in the use of agricultural wastes to give them an useful employment when replacing materials of great demand. The experimental combinations were done varying the control factors values: rice husk percentage (R), temperature (T) and thermal treatment time(t). Via to the optimization properties according Taguchi’s Methodology, the elasticity modulus, the absorbed energy in the impact, break maximum module and initial decomposition temperature to each experimental combination were selected. The Qualitek-4 software was used below the biggest the better quality characteristic. The optimum parameters obtained to each control level were: R = 15%, T = 120oC and t = 3 h. These results were confirmed with a new experiment, where similar properties to the wood species were obtained. The developing of this will be useful as substitute of the wood and could improve the environment impact due residual materials.PACS: 88.30.mj, 81.70.Bt, 82.35.PqMSC: 91B82
oai:ojs.publicaciones.eafit.edu.co:article/61
2018-12-13T16:21:35Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/61
2018-12-13T16:21:35Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 171-182
Approximated solution of differentials mixed systems
Castaño–Bedoya, Jorge I.; Universidad EAFIT
García–Jaimes, Orlando; Universidad EAFIT
Sánchez–Cano, José A.; Universidad EAFIT
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/61
differential equations
problems of initial value
approximate solution
developments of Fer
es_ES
In this paper we propose to find an approximate solution to boundary value problems and initial value differential system problems using the method of Fer developments.MSC: 35M10, 35C10, 35A20
oai:ojs.publicaciones.eafit.edu.co:article/62
2018-12-13T16:21:34Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/62
2018-12-13T16:21:34Z
Universidad EAFIT
Vol. 5 No. 10 (2009); 133-154
Finite Element Modeling of Composite Materials using Kinematic Constraints
Ruiz, Oscar E.; Universidad EAFIT
Barschke, Merlin; University of Applied Sciences
Uribe, David; Universidad EAFIT
Jensen, Jens; University of Applied Sciences
López, Carlos; Universidad EAFIT
2009-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/62
Composite Materials
Geometric Constraints
Kinematic Constraints
es_ES
The purpose of this article is to present simulations of the behavior of composite materials based on kinematic restrictions among the fibers themselves and among fibers and the surrounding resine. In the literature review the authors have found that the kinematic restrictions have not been fully exploited for modeling composite materials, probably due to their high computational expense. The purpose of this article is to show the implementation and results of such a model, by using a Finite Element Analysis of geometric restrictions prescribed to the resine and fiber nodes. Closed analytic descriptions on behavior of layered composite materials are very rare. Many approaches to describe layered composite material are based on the theory of functions [formula] and [fórmula], such as the Classic Layer Theory (CLT). These theories of functions contain strong simplifications of the material, in particular for woven composites. A hybrid approximation to model composite materials with Finite Elements (FEA) was developed by Sidhu and Averill and adapted by Li and Sherwood for composite materials woven with glass polypropylene. The present article presents a method to obtain values for the properties of the composed materials. Such values are used to simulate the reinforced woven fibers by applying layered elements in the ANSYS software. Our model requires less simplifications as compared with the theories [formula] and [fórmula]. In the present article, differing from the model Li and Sherwood, the weaving model is geometrically simulated. A Boundary Representation (B-Rep "Hand" model) with genus 1 (with complex geometry) was used to apply geometric restrictions to the layers resine, fiber, etc., showing to be appropriate to simulate complex structures. In the future, non linear properties of materials are to be considered, as well as to perform the required experimental work.PACS: 88.30.mj, 81.05.LgMSC: 65L60, 53A17
oai:ojs.publicaciones.eafit.edu.co:article/63
2018-12-13T16:21:45Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/63
2018-12-13T16:21:45Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 9-23
Optimal placement of distributed generation in electric power system
López–Lezama, Jesús María; Universidad Estadual Paulista (UNESP)
Padilha–Feltrin, Antonio; Universidad Estadual Paulista (UNESP)
Gallego Pareja, Luis Alfonso; Universidade Estadual Paulista
2009-06-22
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/63
optimal power flow
distributed generation
locational marginal prices.
es_ES
This paper presents a methodology for optimal placement of distributed generation (DG) in electric power system. The candidate buses for DG placementare identified on the bases of locational marginal prices. These prices are obtained by solving an optimal power flow (OPF) and correspond to the Lagrange multipliers of the active power balance equations in every bus of the system.In order to consider the distributed generation in the OPF model, the DG was modeled as a negative injection of active power. The methodology consists ofa nonlinear iterative process in which DG is allocated in the bus with the highest locational marginal price. Three types of DG were considered in the model: 1) internal combustion engines, 2) gas turbines and 3) microturbines.The proposed methodology is tested on the IEEE 30 bus test system. The results obtained show that DG contributes to the reduction of nodal prices, and it can help to alleviate congestion problems in the transmission network.PACS: 88.80.H-, 88.50.Mp
oai:ojs.publicaciones.eafit.edu.co:article/208
2018-12-13T16:22:00Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/208
2018-12-13T16:22:00Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 9-25
Following the titration monoprotic acid–strong base with High Performance Liquid Chromatography –HPLC–
Correa Maya, Carlos Arturo; Universidad EAFIT
Arbeláez, Edgar Darío; Universidad EAFIT
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/208
titration
chromatographic titration curves
monoprotic organic acids
HPLC.
es_ES
This article proposes the High Performance Liquid Chromatography as an alternative to realize the follow up of the weak acids with strong bases titrations. Taking advantage of the kindness of this powerful instrumental technology it is possible to visualize in real time all the substances involved in the process to quantify with extraordinary precision the variation of its concentration and to generate new graphs that allow analyzing the advance of the neutralization process from different perspectives. It is studied the titration case of the acetic one as weak monoprotic acid by a strong base, sodium hydroxide, applying a specific chromatographic method for organic acids.
oai:ojs.publicaciones.eafit.edu.co:article/211
2018-12-13T16:21:59Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/211
2018-12-13T16:21:59Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 27-43
Rapid prototyping of craniofacial structures
Isaza, Juan Felipe; Universidad EAFIT - Universidad CES
Naranjo, Mauricio; Universidad EAFIT - Universidad CES
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/211
rapid prototyping
craniofacial structures
biomedical images
cloud points
3D reconstruction
fixed prosthesis
implant supported
es_ES
This article presents a description of Rapid Prototipyng (RP) technology applied to medicine, especially to craniofacial problems, which can produce solid 3D models by adding material. At the same time, describes a specific application from the simulation surgery to insert four screws, which are the basis of a fixed prosthesis supported by implants. The surgical procedure simulation, started with obtaining the mandibular geometry from biomedical image processing of computerized axial tomography (TAC) of an adult woman, totally edentulous. This process was carried out using GIB Points 3D software, developed in this work, with which A 3D cloud point of jaw was obtained, and subsequently exported to ProEngineer Wildfire 3.0. From here, a STL file compatible with most RP machines was created. The technology used for 3D printing, was Fused Deposition Modeling (FDM). A 3D plastic model of jaw, with anatomical and dimensional high quality, using technology available in Colombia was obtained. In addition, it successfully simulated surgical procedure for the installation of four implants using the tools to be used in real surgery. In general, the implemented methodology can be used for surgical planning procedures and thus avoid trial and error test, that might put the patient’s health at risk. Also as a communication tool to explain to the patient surgical procedures to be submitted. In addition, it can be used for educational purposes, for training students, making more effective learning processes in the clinical field, which in turn would result in better outcomes for patientsPACS: 87.57.C-, 87.57.N-, 87.85.Pq, 87.85.OxMSC: 92C55, 68Nxx, 68U07
oai:ojs.publicaciones.eafit.edu.co:article/213
2018-12-13T16:21:58Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/213
2018-12-13T16:21:58Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 45-63
Short run hydrothermal coordination with network constraints using an interior point method
López Lezama, Jesús María; Universidad de Antioquia
Gallego Pareja, Luis Alfonso; Universidade Estadual Paulista
Mejía Giraldo, Diego; Universidad de Antioquia
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/213
hydrothermal coordination
generation scheduling
linear pro- gramming
interior point methods
en_US
This paper presents a lineal optimization model to solve the hydrothermal coordination problem. The main contribution of this work is the inclusion of the network constraints to the hydrothermal coordination problem and its solution using an interior point method. The proposed model allows working with a system that can be completely hydraulic, thermal or mixed. Results are presented on the IEEE 14 bus test system.PACS: 84.60.Rb, 88.60.-mMSC: 90C05, 90C51, 49M15
oai:ojs.publicaciones.eafit.edu.co:article/214
2018-12-13T16:21:56Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/214
2018-12-13T16:21:56Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 65-84
CFD Analysis of the Effect on Buoyancy Due to Terrain Temperature Based on an Integrated DEM and Landsat Infrared Imagery
García, Manuel Julio; EAFIT University
Boulanger, Pierre; University of Alberta
Duque, Juan; EAFIT University
Giraldo, Santiago; EAFIT University
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/214
Buoyancy
Landsat
Digital Elevation Models
Computational Fluid Dynamics
en_US
This paper deals with the influence of concrete structures on atmospheric temperatureand the convection winds generated in the Aburra Valley in Medell´ın,Colombia. This area is characterised by low wind velocities with a high industrydensity. A digital elevation model was used from the Radar ShuttleTopography Mission and post-processed in order to obtain a valid volumetricCFD domain. The construction process includes hole-filling due to imperfectionsin the original radar data, decimation of the original cloud-of-points to reduce the excess of detail in regions with low curvature, and the introductionof a volume of air over the terrain surface (CFD domain). Landsat satellitedata was used to set the terrain temperatures for various material compositions.The converted infrared image was then registered into the CFD domainusing an interpolation technique.Navier–Stokes Equations were solved for buoyant, turbulent flow of compressiblefluids accounting for convection and heat transfer effects. Simulationincludes buoyancy and turbulence flow through the k–epsilon model using thehigh-performance computing facilities of Westgrid (Western Canada ResearchGrid). Preliminary results show wind distributions that compare to the oneobserved at low–altitude in the region.PACS: 47, 95.55.Rg, 07.57.KpMSC: 76, 97M50
oai:ojs.publicaciones.eafit.edu.co:article/216
2018-12-13T16:21:55Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/216
2018-12-13T16:21:55Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 85-98
Nanoindentation based on force spectroscopy with an atomic force
Arroyave Franco, Mauricio; Universidad EAFIT
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/216
atomic force
force spectroscopy
nanoindentation.
es_ES
An implementation of the method for surface indentation based on Atomic Force Microscopy (AFM), is presented. The implementation was done using the Force Spectroscopy (FS) usually enabled on this instruments which allow vertical movement of the AFM tip without lateral displacement. Determination of the sensitive factor of the AFM cantilever was necessary to know the applied forces in the indentation process. Force versus depth curves similar to Depth–Sensing Indentation (DSI) curves were obtained however these cannot be used for mechanical diagnostics with Oliver & Pharr method. Indentations about 1 nm and 50 nm of depth on polycrystalline Silicon and 6261 Aluminium alloy respectively were produced. These open important applicationsin materials nanotechnology.PACS: 07.79.Lh,34.20.Cf, 07.75.+h
oai:ojs.publicaciones.eafit.edu.co:article/218
2018-12-13T16:21:54Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/218
2018-12-13T16:21:54Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 99-128
Numerical treatment of cosserat based rate independent strain gradient plasticity theories
Gómez C., Juan David; EAFIT University
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/218
non–classical continuum theories
Cosserat continuum medium theory
couple stress theory
small scale inelastic response
finite element analysis
constitutive modeling
integration algorithms
en_US
The current trend towards miniaturization in the microelectronics industryhas pushed for the development of theories intended to explain the behaviorof materials at small scales. In the particular case of metals, a class ofavailable non–classical continuum mechanics theories has been recently employedin order to explain the wide range of observed behavior at the micronscale. The practical use of the proposed theories remains limited due to issuesin its numerical implementation. First, in displacement–based finite elementformulations the need appears for higher orders of continuity in the interpolationshape functions in order to maintain the convergence rate upon meshrefinement. This limitation places strong restrictions in the geometries of theavailable elements. Second, the available inelastic constitutive models for smallscale applications have been cast into deformation theory formulations limitingthe set of problems to those exhibiting proportional loading only. In thisarticle two contributions are made for the particular case of a Cosserat couplestress continuum. First it describes a numerical scheme based on a penaltyfunction/reduced integration approach that allows for the proper treatment ofthe higher order terms present in Cosserat like theories. This scheme results in a new finite element that can be directly implemented into commercial finiteelement codes. Second, a flow theory of plasticity incorporating size effects isproposed for the case of rate independent materials overcoming the limitationsin the deformation theory formulations. The constitutive model and its correspondingtime–integration algorithm are coupled to the new proposed finiteelement and implemented in the form of a user element subroutine into thecommercial code ABAQUS. The validity of the approach is shown via numericalsimulations of the microbending experiment on thin Nickel foils reportedin the literature.PACS: 81.40.Lm, 81.40.Jj, 46MSC: 82B21, 65N30
oai:ojs.publicaciones.eafit.edu.co:article/220
2018-12-13T16:21:48Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/220
2018-12-13T16:21:48Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 129-174
CWLFM high range resolution radar for ISAR imaging without motion compensation
Asensio López, Alberto; Universidad Politécnica de Madrid
Gismero Menoyo, Javier; Universidad Politécnica de Madrid
Carretero Moya, Javier; Universidad Politécnica de Madrid
Blanco del Campo, Alvaro; Universidad Politécnica de Madrid
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/220
CWLFM
radar images
ISAR
doppler
ships
motion compensation
es_ES
Over the last years new radar systems uses have been arisen, both civil and military field. These further uses demand more data about the radar targets. Up to now, was enough to know its location, rough velocity and an approximate motion direction, even though, now there is a growing need of security and control, which requires higher accuracy measuring these targets’s characteristics, even to obtain a “radar image” trying to classify or identify it.This article explains how to obtain ISAR radar images, especially using a Continuous Wave Linear Frequency Modulated Radar (CWLFM), not only in a theoretical way but also showing the results achieved in a lot of different experiments made during a four years research–project sponsored by the Spanish Ministry of Science and Technology, emphasizing the high quality of the images obtained, and also, that any kind of control or collaboration was expected from the target. Making the result more important from a practical point of view, opening up much more possible applications to radar systems.PACS: 84.40.XbMSC: 65T50
oai:ojs.publicaciones.eafit.edu.co:article/222
2018-12-13T16:21:47Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/222
2018-12-13T16:21:47Z
Universidad EAFIT
Vol. 4 No. 8 (2008); 175-202
Multi-modal systems of restricted depth
Sierra A., Manuel; Universidad EAFIT
2008-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/222
multi-modal logic
reasoners with restrictions
language with restrictions.
es_ES
They are presented as extensions of the classical propositional logic, the hierarchy of deductive systems SMM–n with n > 1. SMM–n is the multi–modal system of depth–n. The system SMM–1 is the classical propositional logic. The system SMM–(n + 1) it can be seen as the result of applying the necesariedad rule, associated to the reasoners with enough reasoning capacity, once to the theorems of the system SMM–n. The system SMM is of the union of the systems of the hierarchy, and it can be seen as the system of logic multimodal Km with restrictions. The systems SMM–n are characterized with a semantics to the style Kripke, in the one which, the longitude of the chains of possible worlds is restricted.MSC: 03BXX, 03B05, 03B45
oai:ojs.publicaciones.eafit.edu.co:article/224
2018-12-13T16:23:56Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/224
2018-12-13T16:23:56Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 7-22
Some Integrals involving generalized hypergeometric function
Castillo Pérez, Jaime; Universidad de la Guajira
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/224
generalized hypergeometric function
generalized gamma function
es_ES
Recently Virchenko et al have treated a generalized gamma function (see pdf article) is the generalized hypergeometric function presented for Dotsenko in 1991. The object of this paper is to obtain some more results involving especial case of this function and computational forms as obtained.
oai:ojs.publicaciones.eafit.edu.co:article/226
2018-12-13T16:23:55Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/226
2018-12-13T16:23:55Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 23-45
Some modal logics associated to the reasoning of intelligent agents
Rúa M., Gloria; Universidad EAFIT
Sierra A., Manuel; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/226
agent
reasoner
belief
modal logic
logical omniscience
doxastic logic
epistemic logic
kripke models
es_ES
The hierarchies of systems SCR–nT4, SCR–nT5 and SCR–nD45 with n > 3 are presented. In these systems the belief notion is formalized in the sense of justified belief, of knowledge and of conviction respectively, giving systems of doxastic and epistemic logics as a result where the problem of the logical omniscience can be partially controlled. The systems are characterized with Kripke-style semantics. In these semantics, the length of the possible world chains is restricted in function of reasoner’s type. Moreover, the depth of a model corresponds to the maxim length of the possible world chains that they figure in the model, being that the models of depth n are associated to the deductive systems SCR-nT4, SCR-nT5 and SCR-nD45.
oai:ojs.publicaciones.eafit.edu.co:article/228
2018-12-13T16:23:53Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/228
2018-12-13T16:23:53Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 47-69
Analytic expressions for interface terms in general dispersed two–phase flow laden with arbitrary–shaped dispersed elements
Laín, Santiago; Universidad Autónoma de Occidente
Aliod, Ricardo; University of Zaragoza
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/228
dispersed two–phase flow
arbitrary shaped elements
probability density function
indicator function
en_US
This paper presents the methodology of the indicator function–discrete elementsprobability density function statistical average applied to Two–phaseflow modelling. This formulation allows to consider particles of arbitrary shapeand size and it can be applied to any laminar or turbulent flow. In the case ofequal sized spherical dispersed elements, the most common case found in theliterature, the final expression for the interaction terms (contributions thatdescribe the effect of the second phase on the continuous one) are obtainedwithout great difficulties due to the high isotropy of the spherical shape. Thistask, in the general case of non–spherical non–equal particles is no longerstraightforward and the derivation of the appropriate general interaction termsis presented in §4. In the case that the dispersed elements are small enough,some simplifications can be further introduced leading to a final presentation that remembers that obtained for the simplest case of spherical particles, butwhere some of the quantities must be adequately redefined. PACS: 47.50.Cd
oai:ojs.publicaciones.eafit.edu.co:article/230
2018-12-13T16:23:52Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/230
2018-12-13T16:23:52Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 71-85
Optimal power flow using the gradient method to reduce electrical losses in power systems
López Lezama, Jesús María; Universidad de Antioquia
Gallego Pareja, Luis Alfonso; Universidade Estadual Paulista
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/230
optimal power flow
active power losses reduction
optimization in power systems
es_ES
This paper presents an optimal power flow model using the gradient method for the reduction of losses in power systems. The algorithm allows adjusting a set of control variables to find an operation point that minimizes active power losses. The method is based on the power flow solution by Newton’s method. Limits on idependent variables are handled using penalty functions. The algorithm performance is tested using two different approaches to calculate the step size along the feasible direction: a constant step size and a variable step size using the parable adjustment method.
oai:ojs.publicaciones.eafit.edu.co:article/232
2018-12-13T16:23:51Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/232
2018-12-13T16:23:51Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 87-111
Multiobjective Optimization for Multicast Routing in Overlay Networks using Evolutionary Algorithms
Montoya M., Juan Carlos; Universidad EAFIT
Donoso M., Yezid Enrique; Universidad de los Andes
Fabregat G., Ramón; Universitat de Girona
Montoya M., Edwin; Universidad EAFIT
Echeverri S., Diego; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/232
multicast
overlay networks
multiobjective optimization
MOEA
es_ES
Multicast plays an important role in supporting a new generation of applications. At present and for different reasons, technical and non–technical, multicast IP hasn’t yet been totally adopted for Internet. During recent years, an active area of research is that of implementing this kind of traffic in the application layer where the multicast functionality isn´t a responsibility of the routers but that of the hosts, which we know as Multicast Overlay Networks (MON). In this article, routing in an MON is put forward as a multiobjective optimization problem (MOP) where two functions are optimized: 1) the total end to end delay of the multicast tree and 2) the maximum link utilization. The simultaneous optimization of these two functions is an NP–Complete problem and to solve this we suggest using Multiobjective Evolutionary Algorithms (MOEA), specifically NSGA–II.
oai:ojs.publicaciones.eafit.edu.co:article/234
2018-12-13T16:23:49Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/234
2018-12-13T16:23:49Z
Universidad EAFIT
Vol. 4 No. 7 (2008); 113-128
Correlation factor between standard surge waves for testing transient overvoltage suppressor devices
Guillermo Zola, Julio; Universidad de Buenos Aires
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/234
impulse current
transient overvoltage
surge arrester
es_ES
A wide number of standard surge waves current for testing the behavior of transient overvoltage suppressor devices are currently being used. The value of pick surge current is one of the most important tests. The ratio between the surge waves to obtain a correlation factor between them, so they can be applied to get equivalent results is analyzed in this paper. The theoretical conclusions are verified by simulation and laboratory measurements.
oai:ojs.publicaciones.eafit.edu.co:article/237
2018-12-13T16:21:33Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/237
2018-12-13T16:21:33Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 9-33
Hepatitis C virus dynamics with viral load and T killer cells and hepatic damage monitoring without liver biopsies
Alavez-Ramírez, Justino; UJAT
López López, Jorge; UJAT
2010-06-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/237
hepatitis C
viral load
cytotoxic T cells
threshold parameter
parameter estimation.
es_ES
In this work is shown the possibility to predict the stage of a person infected by hepatitis C virus, and the monitoring of the viral load and hepatic damage, without liver biopsies. This is done by numerically estimating the parameters of a mathematical model involving four populations (uninfected liver cells, infected liver cells, viral load and T killer cells) and using a few measurements of viral load and T killer cells. Also, is shown that the influence of the T killer cells population is insignificant in this process, concluding that measurements of viral load and the reduced model of three populations (uninfected liver cells, infected liver cells and viral load) is enough to predict the evolution of an infected person.PACS: 87.19.xd, 87.55.kdMSC: 93A30
oai:ojs.publicaciones.eafit.edu.co:article/240
2018-12-13T16:23:48Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/240
2018-12-13T16:23:48Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 35-45
Microdeformation measurement of concrete roadway slabs using fiber Bragg gratings
Vélez Hoyos, Francisco Javier; Universidad EAFIT
Serpa Imbet, Claudia Milena; Instituto Tecnoógico Metropolitano (ITM)
Gómez Cardona, Nelson Darío; Instituto Tecnoógico Metropolitano (ITM)
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/240
fiber optic sensors
optical fiber Bragg gratings
concrete roadway slabs
finite element method
es_ES
This work shows a non–invasive method for micro–deformation measurements of concrete structures using Bragg grating sensors in optical fibers adhered to the surface. Measurements on roadway slabs under a 10 kN static load are made, finding an approximated ratio of 2 : 1 between the deformation registered by the sensors and the values from a computational simulation with the finite element method. We propose the use of these sensors for slab structural monitoring in a road network employing distributed and wavelength multiplexed sensors. This is a first report in Colombia of roadway slabs microdeformation measurement using fiber optic sensors.PACS: 42.81.-i, 47.11.Fg, 42.79.DjMSC: 76M10
oai:ojs.publicaciones.eafit.edu.co:article/242
2018-12-13T16:23:47Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/242
2018-12-13T16:23:47Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 47-56
Conformal transformation for prescribing scalar curvature on sphere
Granados-Pinzón, Claudia; Universidad Industrial de Santander
Olaya-León, Wilson; Universidad Industrial de Santander
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/242
conformal metric
scalar curvature
Hilbert space
conformal transformation.
es_ES
In [1], Granados proved the existence of a whole family of conformal metrics to the Euclidean metric on Sn having scalar curvature n(n−1). In this paper, we find another solution to the problem of prescribing scalar curvature on Sn. Furthermore, if a family of solutions of the general problem is known, we get a new family of solutions.MSC: 53.A30; 53.A10
oai:ojs.publicaciones.eafit.edu.co:article/244
2018-12-13T16:23:46Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/244
2018-12-13T16:23:46Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 57-73
Determination of ceramic microstructure by using optical–digital image processing of SEM images
García Palencia, Oscar; Universidad del Cauca
Pencue, Leonairo; Universidad del Cauca
Villacrez Pastas, Cristian; Universidad del Cauca
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/244
SEM microscopy
particle size
image processing
es_ES
This paper reports the design and implementation of software to ceramographic analysis and quality control in materials science, through image study obtained by scanning electronic microscopy (SEM), of samples polished surface of different ceramics systems. The system is supported on optics-digital image processing to determine: the size of each grain and pore, it roundness and eccentricity as shape factor. This work stands out the use of more efficient techniques of adaptive filtering and edge detection, to the calculus realization for the particle size with high precision, compared with traditional methods encapsulated inside the norms ASTM E112 and E1382. The most outstanding results of this analysis, as the possible application of this system in other investigation areas such as granulometry, oil exploration, geotechnical engineering and thin films are presented in this paper, with superior effectiveness with other commercial software.PACS: 42.30.Va, 81.20.EvMSC: 68U10, 65D19
oai:ojs.publicaciones.eafit.edu.co:article/247
2018-12-13T16:23:44Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/247
2018-12-13T16:23:44Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 75-90
Sand as thermoluminescent dosimeter to therapeutic doses
Ricaurte, Daniel; Departamento de Física y Electrónica, Universidad de Córdoba
Salcedo, Juana; Universidad de Córdoba
Cogollo, Rafael; Departamento de Física y Electrónica, Universidad de Córdoba
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/247
sands
thermoluminescence
dosimetry
en_US
This work describes the characteristic thermoluminiscent of sand coming from Coveñas beaches, for its use as therapeutic dose dosimeter. The selected samples, annealed at 400oC during 1 hour, were irradiated to different doses using an unit of 60Co Theratron 780C in air to ambient temperature. The reading was carried out in a Harshaw TLD 4500. The main dosimetric properties of the material (glow curve, response reproducibility, reutilization, linearity and thermal decay) have been studied in detail. The glow curve of the sand samples presents a peaks TL at about 145◦C. The results show that the material has a linear response to the dose from 50 cGy until 1000 cGy. The studied sand samples can be used as thermoluminescent dosimeters for applications in different areas. The importance of this work is that the sand is a natural substance available in large quantities, low cost and can be used in clinical physics to evaluate the dose received by the patient during medical treatment.PACS: 29.40.-n, 81.40.Wx
oai:ojs.publicaciones.eafit.edu.co:article/248
2018-12-13T16:23:43Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/248
2018-12-13T16:23:43Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 91-104
Simulation of mechanical properties of Zr/ZrN and TiN/ZrN multilayers using the finite elements method
Aristizábal–Soto, H. D.; Universidad Nacional de Colombia
Agudelo, L. C.; Universidad Nacional de Colombia
Bedoya Hincapié, C. M.; Universidad Nacional de Colombia
Restrepo Parra, E.; Universidad Nacional de Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/248
Zr/ZrN
TiN/ZrN
ANSYS
mechanical properties
finite elements.
es_ES
In this work mechanical properties of Zr/ZrN and TiN/ZrN multilayers varying the bilayerd number in 1, 2, 5 and 10, that is, multilayer periods of 2, 1, 0.4 y 0.2 μm, with thickness constant of 2 μm in a ratio 1:1 y 1:3 were studied. For the simulation the ANSYS software was employed, based on the finite elements method. Strain–stress curves, the hardness and Young’s Modulus were obtained as function of the bilayer numbers. According, the analysis carried out, the TiN/ZrN bilayers with 1:3 ratio presented the highest hardness (31±1 GPa) regarding the others and a Young’s modulus approximately of 460 GPa. Results obtained from the mechanical properties simulations of materials |based on Ti and Zr, by using methods like finite elements are promising in the new materials field, in order to predict their performance in industrial and technological applications as hard coatings grown on several tools and machine pieces and from this way reducing the production costs. Moreover, simulations presented in this work can be extended to systems composed by other materials with great utilization.PACS: 47.11.Fg, 73.21.Ac, 87.15.La, 81.40.Lm, 81.70.Bt, 81.70.PgMSC: 76M10
oai:ojs.publicaciones.eafit.edu.co:article/250
2018-12-13T16:23:42Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/250
2018-12-13T16:23:42Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 105-127
Review of the state of art of IR-Ultra-Wideband and simulation of Impulse Responce of the IEEE 802.15.4a channel
Suárez Páez, Julio; Universidad Santo Tomás
Llano Ramírez, Gonzalo; Universidad Politécnica de Valencia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/250
Ultra–Wideband (UWB)
Impulse Radio Power
Dalay Profile
Saleh–Venezuela Model
Nakagami–m Fading
Statistical modeling of IR–UWB channels.
es_ES
This paper reviews the state of the art of the technology based in channels of Ultra Wide band (UWB Ultra–Wideband) focusing on its regulation, standardization, basic applications, IEEE 802.15.4a channel model and simulation of the impulsive response of this type of channel. Also, it aims to introduce the reader to the technologies based on IR–UWB channels and the parameters for modeling and simulation of IEEE 802.15.4a UWB channel.PACS: 41.20.Jb, 42.25.Dd
oai:ojs.publicaciones.eafit.edu.co:article/252
2018-12-13T16:23:41Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/252
2018-12-13T16:23:41Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 129-141
Role of water in maize starch gelatinization: an study by Differential Scanning Calorimetry
Pineda–Gómez, P.; Universidad Nacional de Colombia
Coral, D F; Universidad Nacional de Colombia
Arciniegas, M. L.; Universidad Nacional de Colombia
Rorales Rivera, A.; Universidad Nacional de Colombia
Rodríguez García, M. E.; Universidad Nacional Autónoma de México
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/252
Maize starch
gelatinization enthalpy
DSC.
es_ES
The thermal behavior of corn starch (Sigma Aldrich) was studied by differential scanning calorimetry (DSC). The endothermic peak in the DSC thermogram is associated to the starch gelatinization transition process. Initial phase of process and range in which it occurs is governed mainly by starch concentration in the solution, and the botanical source. This study demonstrates that the parameters associated to the observation method, in the DSC analysis, are influential in the determination of the maize starch gelatinization. In this way, the transition peak temperature, gelatinization enthalpy, and range of temperature are parameters that have to be considered when the moisture of sample and heating rate are changed with a homogenous grain size. For the DSC analysis, samples were prepared whit moisture values of 60, 65, 70, 75 and 80% (w/w), and heated at r = 2, 5, and 10◦C/min. Similarly, for fixed values of moisture (80%), the values of the heating rate were 2, 5, 7, 10 y 15◦C/min. Results indicate that the amount of water has influence over the enthalpy transition; however the peak temperature Tp remains invariable. The variation also depends of rate which transformation is made. Analysis allowed corroborating, that starch transition depends on extrinsic factors during the process. This knowledege about starch gelatinization is very useful for optimizing industrial process derivate of it.PACS: 64.60.-i, 61.25.hk, 61.25.hp, 83.10.Tv
oai:ojs.publicaciones.eafit.edu.co:article/254
2018-12-13T16:23:39Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/254
2018-12-13T16:23:39Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 143-158
Over the non-extensivity parameter for some superadditives systems
Borja–Tamayo, R.; Universidad EAFIT
Cartagena Marín, C.; Universidad EAFIT
Loaiza Ossa, Gabriel Ignacio; Universidad EAFIT
Molina Vélez, G.; Universidad EAFIT
Puerta Yepes, María Eugenia; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/254
entropy
thermostatistics non expansive
super–additives systems
es_ES
In this paper one introduces a bijective relation between the non–extensivity parameter q and the stationary probability density function f corresponding to an observable u for some super–additive systems for which the notion of Tsallis entropy applies. This relation is given as a comparison of linking functions characterizing memoryless of certain random variables associated to parameter q and the stationary density f. Then these results are used to formulate a method for approximating the parameter q based on an estimation of f, provided that the effective energy associated to u equals the effective kinetic energy.PACS: 05.20.Jj , 05.70.CeMSC: 46N55, 28D20
oai:ojs.publicaciones.eafit.edu.co:article/256
2018-12-13T16:23:38Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/256
2018-12-13T16:23:38Z
Universidad EAFIT
Vol. 6 No. 11 (2010); 159-176
Growth, structure and friction behavior of the nanocomposite hard coatings WS2-Ti
W. Scharf, Thomas; The University of North Texas
Sequeda Osorio, Federico; Universidad del Valle
González Carmona, Juan Manuel; Universidad del Valle
Ruden, Alexander; Universidad del Valle
Restrepo, Johan; Universidad Nacional Autónoma de México
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/256
Superlubrication
WS2-Ti
Raman
Pin on disk.
es_ES
Tungsten disulphide (WS2) and titanium doped tungsten disulphide (Ti-WS2) nanocomposites were deposited on silicon substrates, varying substrate temperature and target power, using magnetron co–sputtering in order to obtain different Ti contents in the nanocomposite. The films were analyzed using X-ray difraction (XRD), high resolution scanning electron micrscopy (HRSEM/EDS) and high resolution transmision electron microscopy (HRTEM) to observe the crystallinity and morphology behavior respect the induced Ti percentage and the substrate temperature variation. The inclusion of Ti on the co–sputtering process prevents the WS2 crystallization forming dispersed amorphous nanocrystals (1-3 nm). The friction tests performed in a Pin on Disk (POD) at low temperatures, shows that the room temperature and low Ti concentrations films (between 5 and 14%at) possesses higher life times that pure WS2 films but no significant changes in friction coefficients (COF) were observed. The same effect is determined in high temperature POD tests (500◦C) with higher changes in COF. To study solid lubricant mechanisms, samples prepared by focus ion bean (FIB), were analyzed by Raman spectroscopy, determining surface deformation and tribo-chemical compounds formation in the wear track. The formation of WO3 in the surface during wear (tribo–oxidation) and transfer to the counterface (third body generation) was observed. Ti doping, producing a nanocomposite, is a procedure that improves tribological properties of the material in humid and high temperature environments. Obtaining these improvements by means of element doping has been poorly studied in detail and a reaction mechanism is presented allowing the phenomena explanation using advanced novel analysis techniques like FIB.PACS: 31.15.E, 81.15.-z
oai:ojs.publicaciones.eafit.edu.co:article/326
2018-12-13T16:23:37Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/326
2018-12-13T16:23:37Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 11-41
Local atractivity in zip bifurcation
Escobar–Callejas, Carlos Mario; Universidad Tecnológica de Pereira
González–Granada, José Rodrigo; Universidad Tecnológica de Pereira
Posso Agudelo, Abel Enrique; Universidad Tecnológica de Pereira
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/326
zip bifurcation
k–strategist
r–strategist
functional response
dinamical population
competitive exclusion principle.
es_ES
In this paper the local segment attractiveness equilibrium that forms on the phenomenon of zip bifurcation for a three–dimensional system of differential equations nonlinear is studied. This work may be regarded as a generalization as a result on Farkas’s zip bifurcation in competition models.MSC: 34K18
oai:ojs.publicaciones.eafit.edu.co:article/331
2018-12-13T16:23:35Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/331
2018-12-13T16:23:35Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 43-49
A simple proof of Abel’s theorem on the lemniscate
Solanilla, Leonardo; Universidad del Tolima
Palacio, Óscar; Universidad del Tolima
Hernández, Uriel; Universidad del Tolima
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/331
Abel’s theorem on the lemniscate
Gauss lemniscatic functions
geometric constructions.
es_ES
Since Abel’s original paper of 1827, his remarkable theorem on the constructibilityof the lemniscate splitting has been proven with the aid of Elliptic Functions. Nowadays, Rosen’s proof of 1981 is considered definitive. He also makesuse of (modern and more elaborate) Class Field Theory. Here we present anovel, short and simple proof of Abel’s Theorem on the lemniscate and itsconverse. Our only ingredients are the addition formulas of Gauss lemniscaticfunctions and some basic facts of Galois Theory.MSC: 11J89, 33E05
oai:ojs.publicaciones.eafit.edu.co:article/332
2018-12-13T16:23:34Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/332
2018-12-13T16:23:34Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 51-64
Fraccional Fourier transform in the case of an inclined image plane
Torres, C O; Grupo LOI, Universidad Popular del Cesar
Mattos, L; Grupo LOI, Universidad Popular del Cesar
Jiménez, C; docente, grupo GIMA, Universidad de La Guajira
Castillo Pérez, Jaime; docente, grupo GIMA, Universidad de La Guajira
Torres, Y; Docente investigador, grupo GOTS, Universidad Industrial de Santander
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/332
Fresnel diffraction
inclined image plane
fractional Fourier transform.
es_ES
The well-known Fresnel integral relates a known complex wave defined in the object plane (the input wave field) to the observable complex wave (the output wave field) defined in the image plane after free-space propagation; this means that if the object and image plane are parallel to each other, corresponding imaging system is said to be linear-shift-invariant (LSI). This advantageous property was essential for the development of phase sensitive imaging techniques; however, if the image plane is inclined with respect to the incident beam, the effective propagation distance will vary over the image plane, consequently, the imaging system is not shiftinvariant. In this paper an extension of the theoretical formalism of Fresnel diffraction to the case of an inclined image plane is proposed using the fractional Fourier transform.MSC: 33D15, 33D90, 33D60, 34M03, 62E15
oai:ojs.publicaciones.eafit.edu.co:article/333
2018-12-13T16:23:33Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/333
2018-12-13T16:23:33Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 65-80
Motion equation of a finite dynamic elastic plane lineal element plane lineal element
Hossne, Américo G; Universidad de Oriente, Núcleo de Monagas.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/333
Hamilton principle
elastic dynamic planar element
four barplanar mechanism
lagrangian
mass matrix
rigid matrix and gyroscopic matrix.
es_ES
A lineal finite element with constant traverse section, it can adopt any orientation in the plane, and their ends or nodes tie it to the rest of the elements. The kinetic energy (T ) and potential (V ) of a dynamic elastic element are the basement in the implementation of the Hamilton principle for the definition of a finite element. The definition of the kinetic energy and potential is the first step for the preliminary variational formulation to the enunciation for finite elements that it is used to solve, say, the problems of mechanisms that move in the plane using the Hamilton equation. The general objective consisted on defining the equation of the movement of a finite lineal dynamic elastic plane element using the equation of Hamilton, starting from the lagrangiana (T − V ) obtained with the use of a polynomial of fifth and first degree, with eight degrees of freedom, four in each node that represented the deformations: axial (u(x)), traverse (w(x)), slope ((dw(x)/dx)) and bend ((d2w(x)/dx2)). The deformation due to traverse shearing, insignificant with respect to flexional and axial deformations, the rotational inertia and the frictional forces in the nodes, were underrated with the purpose of producing a friendly element. The specific objectives were to take place: (a) the translational mass matrix [MD], (b) the translational gyroscopic matrix [AD], (c) the translational total rigidity matrix [KD], and (d) the deformation vector (S). As a result the movement equation of a finite lineal dynamic elastic plane element was forged [MD]( ¨ S) − 2¨[AD]( ˙S ) + {[K] − ˙2[MD] − ¨[AD]}(S) = (Q) . On concluded that the equation obtained variationally with the application of the Hamilton Principle is the state–of–the–art pattern, and that the procedure can be used when it is required to increase the number of the pattern freedom degrees. PACS. 45.20.Jj, 47.10.DfMSC: 37Jxx
oai:ojs.publicaciones.eafit.edu.co:article/335
2018-12-13T16:23:32Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/335
2018-12-13T16:23:32Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 81-115
Epistemic and doxastic logic with restrictions
Sierra A., Manuel; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/335
multi–modal logic
possible worlds embedded
epistemic logic
doxastic logic
logical omniscience.
es_ES
Are presented as extensions of classical propositional calculus hierarchies of deductive systems LDR–n and LER–n with n > 1. LER–n is the epistemic logic with restrictions, LDR–n is the doxastic logic with restrictions. The systems LER–1 and LDR–1 are the classical propositional calculus. System LER–(n + 1) can be seen as the result of applying the rule: if X is theorem of LER–n then +X is theorem of LER–(n + 1). Systems also restricts the validity of the axioms +(X → Y ) → (+X → +Y ) and +X → X, in terms of depth (complexity with respect to the operator +) of X and Y , and also includes restricted versions of the axioms of positive and negative introspection. LER system results from the union of LER–n systems, and can be seen as the S5 modal logic system with different types of restrictions. Changing +X → X by +X →∼+∼X are built LDR–n and the LDR systems. LDR can be seen as the KD45 modal logic system with different types of restrictions. The systems are characterized with a embedded worlds semantics, with which the ‘omniscience logical problem’ is limited.MSC: 03B42, 03B45
oai:ojs.publicaciones.eafit.edu.co:article/336
2018-12-13T16:23:30Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/336
2018-12-13T16:23:30Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 117-144
Dynamics in systems of pipes with different movements in its ends
Luévanos-Rojas, Arnulfo; Profesor–investigador, Universidad Juárez del Estado de Durango, Victoria de Durango–México
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/336
influence matrix
modal analysis
spectral analysis
characteristic values and vectors
factor of modal participation
spectral acceleration and vector of normal coordinates principles
es_ES
In this document a method of dynamic analysis of systems of pipes with different movements in the ends sets out. This methodology takes the response spectrum corresponding to each one of the supports, and to compare it with the method of simple answer, that it uses a surrounding one in the response spectrum of the different supports is the classic one, in this last one they are not preservative, as it is possible to be noticed in the table of results of the considered problem. Therefore, the usual practice to consider the surrounding one of spectrum will not be a recommendable solution. Also the use of the consistent masses or distributed, and not discreet or concentrated them, as normally it is made, and in addition it is become attached but to the reality.PACS: 93.85.Tf, *91.30.P-, 91.30.Px
oai:ojs.publicaciones.eafit.edu.co:article/337
2018-12-13T16:23:29Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/337
2018-12-13T16:23:29Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 145-170
Binomial tree for option valuation process derived from stochastic autonomous differential equation
Marín-Sánchez, Freddy; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/337
stochastic differential equations
binomial trees
transition probabilities
pricing of options.
es_ES
In this paper we propose a multiplicative generalized binomial trees recombination associated with the autonomous equation in terms of the initial condition and the product of non-constant upwards and downwards jumps from the discretized process. We present a formal technique for finding the dynamic transition probabilities involving the first two moments of the solution to the differential equation, which incorporate the factor of growth and volatility in terms of the parameters and the underlying process along its branching. Some experimental numerical results are shown for European option pricing for lognormal process and the processes of mean reversion with additive noise and proportional noise for different expiration dates.MSC: 91Gxx, 91G80
oai:ojs.publicaciones.eafit.edu.co:article/338
2018-12-13T16:23:28Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/338
2018-12-13T16:23:28Z
Universidad EAFIT
Vol. 6 No. 12 (2010); 171-202
Light measurement model to assess software development process improvement
Vásquez, Diana; Estudiante de doctorado, Universidad Carlos III de Madrid, Madrid–España.
Pardo, César; Estudiante de doctorado, Universidad de Castilla–La Mancha, Ciudad Real–España
collazos, César A; profesor titular, Universidad del Cauca, Popayán–Colombia
Pino, Francisco J; profesor titular, Universidad del Cauca, Popayán–Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/338
programming and software engineering
software process improvement (SPI)
small and medium enterprises (SME’s)
measurement process
peasure podels
indicators.
es_ES
Companies in software development in Colombia face a number of problems such as the construction of software in a artesian, empirical and disorganized way. Therefore, it is necessary for these companies to implement projects to improve their development processes, because ensure the quality of products, by improving their software processes, is a step that should give to be able to compete in the market. To implement process improvement models, it is not enough to say whether a company is actually getting benefits, definitely one of the first actions in a to improvement project is to be able to determine the current status of the process. Only by measuring it is possible to know the state of a process in an objective ay, and only through this it is possible to plan strategies and solutions, about improvements to make, depending on the objectives of the organization. This paper proposes a light model to assess software development process, which seeks to help the Colombian software development companies to determine whether the process of implementing improvements, being effective in achieving the objectives and goals set to implement this, through the use of measures to evaluate the process of improving their development processes, allowing characterize the current practices of the company, identifying weaknesses, strengths and abilities of the processes that are carried out within this and thus control or prevent the causes of low quality, or deviations in costs or planning.MSC: 68Uxx, 68Nxx
oai:ojs.publicaciones.eafit.edu.co:article/398
2018-12-13T16:21:31Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/398
2018-12-13T16:21:31Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 7-28
A combined pool/bilateral dispatch model for electricity markets with security constraints
López Lezama, Jesús María; Universidad de Antioquia
Granada–Echeverri, Mauricio; Universidad Tecnológica de Pereira
Gallego Pareja, Luis Alfonso; UNESP–Ilna Solteira
2011-12-05
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/398
optimal dispatch
bilateral contracts
energy markets.
es_ES
The secure operation of the electric power system is a challenging task for the system operator which is responsible of its coordination, control and monitoring. In most power systems security is typically handled on a multi–stateapproach. In which case, security criteria are incorporated by means of additional constraints, modifying the initial dispatch calculation. In this papera generation dispatch model for competitive energy markets considering security constraints is presented. The proposed approach combines the generationdispatch related to pool and bilateral markets with coupled post–contingency optimal power flows into a single optimal dispatch model, avoiding economic inefficiencies that appear in conventional multi–stage dispatch approaches.The proposed model is linear, and as such, it is based on a DC model of the network. A 6–bus didactic system and the IEEE RTS–24 bus test systemare used in order to show the operation and effectiveness of the proposed approach and to compare it with the basic pool/bilateral dispatch with no security constraints. Results show that the inclusion of security constraints leadto a higher dispatch cost. Furthermore, it was found that the enforcement offirmed bilateral contracts might lead to system congestion.PACS. 88.80.H-, 88.50.Mp, 88.05.Lg
oai:ojs.publicaciones.eafit.edu.co:article/399
2018-12-13T16:23:27Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/399
2018-12-13T16:23:27Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 29-45
Simulation operations and line of balance: integrated tools for decision making
Botero Botero, Luis Fernando; Universidad EAFIT
Acevedo, Harlem; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/399
simulation
line of balance
construction
lean construction.
es_ES
This paper presents the joint implementation of the simulation of operations and lines of balance, as tools that help to improve the efficiency in construction project planning, where the integration of these tools has been scarce in the national and international field. This paper expounds the simulation results of the activities associated with the construction works of structure, assembly and casting of walls and slab, in a multi–story building. The construction system is modeled, according to the way it is done by the company, and with the help of the lines of balance, generating two alternative scenarios in order to compare the times and the average costs of project completion. The first scenario takes advantage of the slack found in the current system in relation to the time of initiation of activities, without changing the amount of human resources and equipment. In second scenario, the amount of human resources is slightly increased, and the amount of forms for walls and slab increases by 25%. From the results, companies have a methodology for planning and selecting the appropriate scenario, according to their convenience.MSC: 90B50, 93C65
oai:ojs.publicaciones.eafit.edu.co:article/400
2018-12-13T16:23:25Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/400
2018-12-13T16:23:25Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 47-64
Secondary distribution system planning using branch and bound
Tapias-Isaza, Carlos Javier; Universidad Tecnológica de Pereira (UTP), Pereira.
Galeano-Ossa, Andrés Alberto; Universidad Tecnológica de Pereira (UTP), Pereira.
Hincapie Isaza, Ricardo Alberto; Universidad Tecnológica de Pereira (UTP), Pereira.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/400
branch and bound
mixed integer linear programming
distribution
es_ES
This paper presents a methodology for solving secondary distribution systems planning problem as a mixed integer linear programming problem (MILP). The algorithm takes into account several design issues such as the capacity and location of distribution transformers and secondary feeders. Variable costs of secondary feeders are also considered. The problem is solved using branch and bound algorithm. Numerical results show that the mathematical model and the solution technique are effective for this kind of problems.PACS: 88.80.H-, 88.50.Mp,MSC: 90C11, 90C57
oai:ojs.publicaciones.eafit.edu.co:article/401
2018-12-13T16:21:30Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/401
2018-12-13T16:21:30Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 65-86
Integral evaluation process for obtaining pectin and essential oil
Cerón-Salazar, Ivonne; Universidad Nacional de Colombia, sede Manizales, Manizales.
Cardona-Alzate, Carlos; profesor asociado, Departamento de Ingeniería Química, Universidad Nacional de Colombia, sede Manizales, Manizales.
2011-12-05
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/401
Orange peel
essential oil
pectin
simulation
extraction.
es_ES
In this paper, an alternative for essential oil and pectin extraction from orange peel (Citrus sinensis) as an integral process was presented. The extraction units were simulated using commercial simulator software for real process conditions. Experimental tests were carried out with a kilogram of orange peel with the same conditions used in of the simulation with the aim of comparing the experimental and calculated yields. Subsequently, the process was scaled to 1000 kg. Advantages of the integrated process and its possibilities of implementation at industrial level were showed. Moreover, it was concluded that simulation techniques are powerful tools that allows minimizing time, costs and experimentation in the design of processes such as essential oil extraction and pectin extraction.PACS: 82.80.Bg, 88.20.ft
oai:ojs.publicaciones.eafit.edu.co:article/402
2018-12-13T16:23:24Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/402
2018-12-13T16:23:24Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 87-110
Supply channel coordination in a newsvendor model with two allocation quotas
Arango Ospina, Gerardo; Universidad EAFIT
Escalante Coterio, César; Risks Consultant, Delima Marsh, Medellín.
Rendón Aguirre, Carolina
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/402
channel coordination
newsvendor model
limited reserve
es_ES
The motivation for this paper arises from an article written by Jianli Li and Liwen Liu in 2007, extending the classical newsvendor model to a supply chain where the dealer, after depletion of an initial order, is given the option of a second order within an allocation quota prescribed and conditioned by the manufacturer. The paper analyzes coordination of the channel in order to improve the expected benefits of the system.This paper extends the model to allow the newsvendor a second allocation quota at the end of the period, under similar conditions. The possibilities andincentives for channel coordination are studied.MSC: 90C15
oai:ojs.publicaciones.eafit.edu.co:article/403
2018-12-13T16:23:23Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/403
2018-12-13T16:23:23Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 111-130
A Proposal to increase by genetic algorithm the discriminatory
Martínez, Dúber; Universidad del Valle
Loaiza C, Humberto; Universidad del Valle
Caicedo B, Eduardo; Universidad del Valle
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/403
Faces recognition
infrared images
genetic algorithm
Principal
es_ES
PCA and LDA are two of most widely used techniques for face recognition with IR images. In this paper we report the results obtained by using Genetics Algorithms for optimization the characteristic vector generated by these techniques, by assignation of weights to each vector according its performance in the classification task. It shows that, under the proposed scheme, is able to obtain a lower classification error compared to conventional method.PACS: 07.05.Pj, 07.57.Kp, 85.25.Pb,MSC: 68T05
oai:ojs.publicaciones.eafit.edu.co:article/404
2018-12-13T16:23:21Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/404
2018-12-13T16:23:21Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 131-150
Theoretical study of the elastic properties of the minerals Cu3TMSe4 (TM = V, Nb, Ta) by means of atomistic first-principles calculations
Ruiz, Carlos Mario
Osorio-Gillén, Jorge M; Profesor-Asistente, Instituto de Física, Universidad de Antioquia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/404
elastic properties
elastic constants
mechanical properties
density functional theory.
es_ES
The elastic properties of the family of isostructural minerals Cu3VSe4, Cu3NbSe4 and Cu3TaSe4 have been calculated for the first time using the state of the art in first-principles atomistic calculations, using Density Functional Theory and the Generalized Gradient Approximation for the exchangecorrelation energy functional. The elastic properties calculated are bulk modulus (B), the elastic constants (c11, c12 and c44), the Zener anisotropy factor (A), the isotropic shear modulus (G), the Young modulus (Y ), and the Poisson ratio (). By means of these quantities we also computed other thermodynamic properties such as the average transversal (st) and longitudinal (sl) sound velocities and the Debye temperature (D). The calculated values of B, c11, c12 and c44, G, Y and lead us to the conclusion that these compounds are compressible, fragile and brittle.PACS: 91.60.Ba
oai:ojs.publicaciones.eafit.edu.co:article/405
2018-12-13T16:23:20Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/405
2018-12-13T16:23:20Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 151-159
A differential equation for the calculation of the functions de jost for regular potentials Application to the system e‾+ H(1s)
Alcalá, Luis Arturo; Grupo de Física Teórica y Aplicada, Universidad de Córdoba (Unicor), Montería
Maya Taboada, Héctor; Grupo de Física Teórica y Aplicada, Universidad de Córdoba (Unicor), Montería
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/405
Jost function
differential equation
scattering matrix
phase shifts.
es_ES
The function of Jost Fl is the theoretical concept that allows to study in an unified way the bound, virtual, scattered and resonant states that can originate in the interactions between two quantum systems. In theory of collisions the function of Jost Fl plays a very important role, since it is related in a direct way with the scattering matrix S. In most of the existent methods in theory of collisions for the calculation of the function Fl first is necessary to know the regular solution of the treated system, which is obtained of the solution of the radial equation of Schrodinger, to be able to find the function Fl later. With the methodology proposed in this work an ordinary lineal differential equation of second order it is obtained whose solution in the asymptotic boundary coincides with the function Fl. The advantage of the present work is that solving the differential equation mentioned before one can obtain in a direct way the function Fl without having to find the regular solution of the problem. Another advantage is that not caring the initial conditions (real) that are chosen for the solution of the differential equation, the same elements of the matrix S, are always obtained. As an example and test of the methodology, it is solved this differential equation numerically for the elastic scattering of electrons by hydrogen atoms in the ground state to low energy (e− + H(1s)), obtaining for this system the function Fl, the elements of the matrix S and the phase shifts. The data obtained for the phase shifts are compared with the calculated by Klaus Bartschat.PACS: 11.55.-m
oai:ojs.publicaciones.eafit.edu.co:article/406
2018-12-13T16:23:19Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/406
2018-12-13T16:23:19Z
Universidad EAFIT
Vol. 7 No. 13 (2011); 161-183
Solution of a simplified advertising model using optimal control techniques
Tuchnolobova, Ekaterina; Universidad Estatal de Irkutsk, Irkutsk.
Terletskii, Viktor; Universidad Estatal de Irkutsk, Irkutsk.
Vasilieva, O; Universidad del Valle
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/406
advertising model
optimal control
concentrated parameters
Pontryagin maximum principle.
es_ES
In this article we present a simplification of the distributed model of advertising by formulating it as a family of optimal control problems with concentrated parameters. We consider two simplified models: linear and non-linear. Linear model is solved analytically using the maximum principle. To solve non-linear model, we construct a numerical algorithm based on two nonconventional increment formulae for the objective functional.MSC : 49N05
oai:ojs.publicaciones.eafit.edu.co:article/425
2018-12-13T16:23:18Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/425
2018-12-13T16:23:18Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 11-27
Influence of processing parameters on micro-perforated with ultrashort pulses
Ceballos P, S; Universidad Nacional de Colombia, sede Bogotá
Moreno, P; Universidad de Salamanca
García, A; Universidad de Salamanca
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/425
ablation
micromachining
ultrashort laser pulses
helical drilling optics.
es_ES
In this work, ultra short laser pulses (110 fs, 1 kHz; up to 1.1 mJ/pulse) were used for micromachining steel samples. Processing with ultra-short laserpulses allowed achieving circular micro holes, with precise measurements and no signi cant chemical or mechanical disruption of adjacent areas. The heli-cal drilling optics system by TGSW-Stuttgart is used to generate the holes.This system allowed producing high aspect ratio and complex structures with variable diameter throughout the hole. To did this, up to three processing pa-rameters may be changed at the same time (beam rotation speed, angle and of the beam) and during the processing. We study the influence of the laserwavelength on the holes geometry. Speci c optics for both the fundamental ( = 790nm) and second harmonic wavelength ( = 395nm) were used tomicrostructure steel, comparing the results. From the study we can conclude that there arent advantage when using the second harmonic. Weaknesses inthe experimental device had been detected, to nd the solution at this topics allow precisely evaluate the influence of wavelength.PACS: 79.20.Eb
oai:ojs.publicaciones.eafit.edu.co:article/426
2018-12-13T16:23:16Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/426
2018-12-13T16:23:16Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 71-82
Influence of substrate temperature on the microstructure of TiN/TiC
Devia, D M; Universidad Tecnológica de Pereira
Mesa, Fernando; Universidad Tecnológica de Pereira
Arango, Pedro José; Universidad Nacional de Colombia, sede Manizales
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/426
Pulsed Arc
Microstructure
TiN/TiC
XPS
XRD.
es_ES
TiN/TiC bilayers were deposited using Plasma Assisted Physical Vapor Deposition technique PAPVD)-Pulsed Arc, varying the substrate temperature ina range of 100-120◦C, with intervals of 5◦C. Coatings were analyzed throughXPS and XRD. From signal processing narrow spectrum of XPS and the XRD patterns, was determined the formation of TiN (Titanium Nitride), TiC (Titanium Carbide) and TiCN (Titanium Carbide Nitride) compounds in thecrystallographic.PACS: 68.35.Ct, 68.55.A-, 68.65.Ac
oai:ojs.publicaciones.eafit.edu.co:article/427
2018-12-13T16:23:15Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/427
2018-12-13T16:23:15Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 29-48
Product and Quotient of Independent Gauss Hypergeometric Variables
Nagar, Daya Krishna; Universidad de Antioquia
Bedoya Valencia, Danilo
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/427
Appell's first hypergeometric function
beta distribution
Gauss hypergeometric distribution
quotient
transformation
en_US
In this article, we have derived the probability density functions of the productand the quotient of two independent random variables having Gauss hypergeometricdistribution. These densities have been expressed in terms of Appell'srst hypergeometric function F1. Further, Renyi and Shannon entropies havealso been derived for the Gauss hypergeometric distribution.MSC: 33Cxx, 33C65
oai:ojs.publicaciones.eafit.edu.co:article/429
2018-12-13T16:23:14Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/429
2018-12-13T16:23:14Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 49-70
Optical Properties of Ldpe Films with different Additives Mixtures
Aperador Chaparro, W; Departamento de Ingeniería Mecatronica, Universidad Militar Nueva Granada
Delgado, A E; Departamento de Ingeniería Mecatronica, Universidad Militar Nueva Granada y Escuela de Ingeniería Julio Garavito (Bogotá)
Bautista Ruiz, J H; Departamento de Física, Universidad Francisco de Paula Santander
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/429
linear low density polyethylene (LDPE)
additives
optical properties
plasticulture
en_US
In this paper were processed dierent linear low density polyethylene (LDPE)formulations, mixed it with ve kind of dierent additives whose objectivewas analyzing the additives eects in the optical properties of LDPE lms ongreenhouse cover structure in protected cultivation for tropical environments.The results of ultra violet and visible region showed that the light transmissionfrom the reference lm was higher than additives lms mixtures in thevisible region, eect of some elements and synergistic action from additivescontributing to decrease the light transmission in the ultra violet and visibleregion.PACS: 78.66.Bz
oai:ojs.publicaciones.eafit.edu.co:article/430
2018-12-13T16:23:13Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/430
2018-12-13T16:23:13Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 83-103
Estimation of mechanical properties of rock using artificial intelligence
Galvis, Laura Viviana; Universidad Industrial de Santander (UIS)
Ochoa, César Augusto
Arguello Fuentes, Henry
Carvajal Jiménez, Jenny Mabel
Calderón Carrillo, Zuly Himelda
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/430
artificial intelligence
artificial neural network
genetic algorithm
petrophysical properties
mechanical properties.
es_ES
This paper discusses how two artificial intelligence techniques were combined, neural networks and genetic algorithms for the development of a computational tool used for the estimation of mechanical properties such as tensile strength, uniaxial compressive strength and triaxial compressive strength in sandstones, from petrophysical properties using data from tests of Rock Mechanics Laboratory of the Colombian Petroleum Institute - Ecopetrol SA as training data, to improve the design of non-destructive testing with some degree of confidence and resulting in cost reduction.PACS: 91.60.Ba, 91.60.DcMSC: 82C32
oai:ojs.publicaciones.eafit.edu.co:article/431
2018-12-13T16:23:11Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/431
2018-12-13T16:23:11Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 105-117
α-MoO3 thin films prepared by spray pyrolysis
Martínez, H M; Universidad Nacional de Colombia
Torres, J; Universidad Nacional de Colombia
López-Carreño, L D; Universidad Nacional de Colombia
Alfonso, J E; Universidad Nacional de Colombia
Moreno, Luis; Universidad Nacional de Colombia
Pardo, A; Universidad Nacional de Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/431
MoO3
Spray Pyrolysis
sensor CO
SEM
RX.
es_ES
MoO3 thin films have been deposited on clean glass slides using the spray pyrolysis technique. The samples were grown with different thicknesses by spraying on common glass substrates a solution of(ammoniummolybdatetetrahydrate) ((NH3)6Mo7O244H2O). The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy, scanning electron microscopy (SEM) and electrically through electrical resistivity measurements as a function of temperature. It was found that samples present crystalline structure associated with the alpha phase of MoO3 grown with preferential direction of growth along the planes (0k0). As result of increasing the volume of precursor solution sample surface becomes porous. The change in electrical resistance of MoO3 films by exposure to carbon monoxide (CO) at room temperature, makes the films obtained by this technique could be promising in its use in gas sensing devices at room temperature.PACS: 81.05.Hd 72.80.Jc
oai:ojs.publicaciones.eafit.edu.co:article/438
2018-12-13T16:23:10Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/438
2018-12-13T16:23:10Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 7-22
Microcomputer based sliding regime discrete control for synchronous AC motors
Palomar–Lever, Eduardo; Universidad de Guadalajara
Ryvkin, Sergey; Trapeznikov Institute of Control Sciences RAS
Izosimov, Dimitri; Trapeznikov Institute of Control Sciences RAS
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/438
Sliding mode
observer based control
simulation
limitation algorithms
es_ES
The basic ideas to design discrete algorithms used to calculate unmeasured mechanical or electrical variables, in order to control electrical motors in mechanical systems are presented. The main point of the paper is to simplify the algorithms by using a linear discrete time model without any variable limitations and to reduce the computing capacity requirements of the controller. Limited references, based on the discrete sliding mode for the exception of the influences of variable limitations, are proposed and designed. The main advantage of the controller presented in this paper is that a large control error does not bestow any problems. In such a case, the system always works in an area without the limitations. Original observation algorithms of both position and rotational velocity for exterior permanent magnet synchronous motors are designed. A computer simulation was performed and the results are presented, showing high dynamic accuracy.
oai:ojs.publicaciones.eafit.edu.co:article/439
2018-12-13T16:23:09Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/439
2018-12-13T16:23:09Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 23-39
Production evaluation of Lentinula edodes Pegler fungi in synthetic logs based on agricultural wastes
Villegas Escobar, Valeska; Universidad EAFIT
Milena Pérez, Ana; Universidad EAFIT
Arredondo, Clara; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/439
Lentinula edodes
shiitake
agroindustrial wastes
medicinal and gourmet mushrooms.
es_ES
Production of Lentinula edodes, medicinal and gourmet mushroom commonly known as shiitake, was evaluated in synthetic blocks with the aim of using agroindustrial wastes not jet studied quantitatively and environmentally problematical for many industries. Fifty five different combinations of substrates were analyzed using two agroindustrial wastes (cocoa husk and cotton waste), one wood supplement (oak), one nitrogen source (wheat bran), one pH controller (CaCO3), and one growth stimulator (CaSO4). It was found that the substrate formulation has a considerable effect upon the colonization time of the block (P < 0.05), being the oak supplement essential for the time colonization reduction. Furthermore, the cocoa husk was not a good waste for shiitake production. The treatments that gave the best conditions for shiitake culture contained 75% of oak, and 20 to 25% of wheat bran or 25% of cotton waste. Depending on the treatment evaluated, the biological efficiency achieved were between 5.3 to 21.5%, the pileo size from 4.7 to 9.3 cm for the first flush and the colonization precocity between 69 to 125 days with C/N relationship superior to 110 and with better nutritional value to those reported by other researchers.
oai:ojs.publicaciones.eafit.edu.co:article/440
2018-12-13T16:23:07Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/440
2018-12-13T16:23:07Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 41-62
Usage of the common mango agroindustrial waste (mangifera indica L.) in the destraction of fermentables sugars
Mejía Giraldo, L. F.; Universidad de San Buenventura
Martínez Correa, H. A.; Universidad Nacional de Colombia
Betancourt Gutiérrez, J. E.; Universidad Nacional de Colombia
Castrillón Castaño, C. E.; Universidad Nacional de Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/440
mangos waste
sugars
cellulose
hemicellulose
acid hydrolysis
enzimatic hydrolysis
thermic hydrolysis
alcoholic fermentation.
es_ES
The common mango waste (Mangifera indica L.) is a vegetable material containing a high level of lignocelluloses tissue which can be used to obtain fermentable metabolites and fermentation products. In this study hydrolysis treatments were applied to the common mango in order to make the conversion of its polysaccharides to fermentable sugar units. Acid hydrolysis was applied to three different concentrations of dilute sulphuric acid. An enzymatic hydrolysis with two types of commercial enzymes to different concentrations in standard work conditions, was also applied. In addition, a thermic hydrolysis was applied at two different temperatures. At each treatment, the following tests were applied: total sugar concentration, reduced sugar concentration, and percentage of cellulose and hemicellulose residuals. Based on the data obtained from the tests, the best treatments were identified and so the best combinations of the best hydrolysis treatments were carried out. The most significant treatment for individual tests was acid hydrolysis at 0, 50% v/v sulphuric acid at 80◦C for one hour. In the combined treatments the most relevant result was the treatment that combined the enzymatic hydrolysis (as pretreatment) plus a thermic hydrolysis and acid hydrolysis. For security reasons in the reagents use, as well as in the elimination of collateral adverse effects for further alcoholic fermentation, a procedure involving thermic hydrolysis as pretreatment and enzymatic hydrolysis, was chosen as the main treatment with the most appropriate application in the fermentable metabolites production from common mango waste in order to produce alcohol. Further studies have allowed approaching the hydrolysis via microbial with Aspergillus niger and Trichoderma viride, as well as the alcoholic fermentation post-treatment hydrolytic using previous studies. The simultaneous hydrolysis and alcoholic fermentation, and recently performing the simultaneity of the processes, adding a recombining yeast that has the capacity to ferment sugars from five carbons.
oai:ojs.publicaciones.eafit.edu.co:article/441
2018-12-13T16:23:06Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/441
2018-12-13T16:23:06Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 63-89
On a minimal operator ideals defined by means of interpolation spaces
Puerta Yepes, María Eugenia; Universidad EAFIT
Loaiza Ossa, Gabriel Ignacio; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/441
tensor products
operators
ideals
interpolation spaces.
es_ES
In this paper we introduce a tensonorm defined by interpolation spaces of p spaces and characterize the minimal operator associated in the sense of [1].
oai:ojs.publicaciones.eafit.edu.co:article/444
2018-12-13T16:23:05Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/444
2018-12-13T16:23:05Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 107-134
Displacement based finite elements for acoustic fluid–structure interaction
Correa V, Santiago; Universidad CES–EAFIT, Medellín–Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/444
Acoustic
Finite element
Fluid–structure interaction.
es_ES
This paper compares two finite elements formulations used for solving fluid structure interaction problems in acoustics. In this case the displacement is used as variable for representing the behavior of the acoustic fluid. Finite element codes are writing for each formulation and typical fluid structure interaction problems are solved. The results obtained with each formulation are compared and advantages and disadvantages are obtained.
oai:ojs.publicaciones.eafit.edu.co:article/445
2018-12-13T16:23:04Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/445
2018-12-13T16:23:04Z
Universidad EAFIT
Vol. 3 No. 6 (2007); 135-171
Basic logic for true and false LBVF
Sierra A., Manuel; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/445
truth
falsity
alternating affirmation
alternating negation
paracomplete
good foundation
liar’s paradox.
es_ES
System LBVF is an extension of the classical positive logic, the system includes operators of alternating affirmation, alternating negation and determinability, and the operators of classical negation and good foundation are defined as from them. The system is characterized by a semantic of traditional valuations. Respect to the negation and affirmation operators the system is paracomplete.In the system the definitions of truth and falsity presented by Aristotle are really characterized, representing the Aristotelian falsity with the operator of alternating negation and the Aristotelian truth with the operator of alternating affirmation. This interpretation gives solution to a variant of the liar’s paradox.
oai:ojs.publicaciones.eafit.edu.co:article/446
2018-12-13T16:23:02Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/446
2018-12-13T16:23:02Z
Universidad EAFIT
Vol. 7 No. 14 (2011); 119-142
Study of the thermal properties of corn flours produced by thermal-alkaline treatment
Pineda–Gómez, P.; Universidad Nacional de Colombia
Coral, Diego F; Universidad Nacional de Colombia
Ramos-Rivera, D; Universidad Nacional de Colombia
Rosales Rivera, A.; Universidad Nacional de Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/446
corn fluor
Ca(OH)2
thermo-alkaline treatment
gelatinization.
es_ES
A design of a controlled cooking system (CCS) for corn flours production is presented. The system allows reproducibility in the samples preparation withcontrol of the time and the temperature. The treatment of corn was performed with a cooking time of 120 minutes at 92.5◦C, by adding calcium hydroxide (Ca(OH)2) in concentration between 0 and 0.5% compared to the corn weight.The cooking process was monitored via measures of moisture absorbed by the corn kernels and pH of the solution. The samples were manufactured by operation steps like wet milling, dehydration, dry milling and sieving. The samples were analyzed using modulated differential scanning calorimetry (MDSC)and thermogravimetric analysis (TGA) techniques, which were focused in the thermal stability of the flours and their physical variables: gelatinization range (∆T), enthalpy (∆H), change in heat capacity (∆Cp), temperature decomposition of maximum decomposition rate (Tmd) and residue after decomposition (Rs). The adding of Ca(OH)2 moves the peak gelatinization and the maximum peak of decomposition towards higher temperature. The TGA analysis showed that the addition of calcium hydroxide improves the thermal stability of the flour, since the degradation temperature shifts to higher temperatures as the amount of calcium hydroxide increases. The results were compared with the same analysis performed on raw corn. This study proposes an experimental method, including a controlled cooking system for the production of flour enriched with calcium, which could have a major impact in the field of nutrition. PACS: 64.60.-i, 61.25.hk, 61.25.hp, 83.10.Tv
oai:ojs.publicaciones.eafit.edu.co:article/453
2018-12-13T16:23:01Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/453
2018-12-13T16:23:01Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 7-27
A simulated annealing algorithm for the robust decomposition of temporal horizons in production planning problems
Torres Delgado, José Fidel; Universidad de los Andes
Vélez Gallego, Mario César; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/453
production planning
simulated annealing.
es_ES
The problem of robust decomposition of temporal horizons in production planning was first introduced by Torres [1]. Later, in [2], Torres suggests to start with an integer solution found by dynamic programming, and then to use a simulated annealing algorithm to improve it. According to [2], more needs to be known about the impact of the control parameters in the simulated annealing algorithm, and their sensitivity with respect to the quality of the solutions. In this work we develop this idea and analyze in depth the ability of the simulated annealing algorithm to improve the initial solution. As a result of the computational experiments conducted, we determined that the cooling scheme and the cooling rate have significant effect on the quality of the final solution. It was also established that the solution found depends strongly on the characteristics of the operations plan, finding better solutions for plans with shorter temporal horizons.MSC: 62-XX, 62Kxx, 68Uxx, 65Kxx
oai:ojs.publicaciones.eafit.edu.co:article/454
2018-12-13T16:23:00Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/454
2018-12-13T16:23:00Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 29-42
Design and construction of an instrumented meteorological tethersonde
Gutiérrez L., Wilfrido; Centro de Ciencias de la Atmósfera –UNAM
García E., Manuel; Centro de Ciencias de la Atmósfera –UNAM
Magaña R., Victor O.; Centro de Ciencias de la Atmósfera –UNAM
Escalante G., Jorge A.; Centro de Ciencias de la Atmósfera –UNAM
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/454
tethersonde
boundary layer.
es_ES
Observations of the planetary boundary layer are essential for in numerical weather prediction. However, such observations are usually expensive, which makes them inaccessible for a majority of projects. Therefore, the need of less expensive instruments for boundary layer measurements has led to the design and construction of an instrumented meteorological captive balloon comparable with various existing systems such as radiosondes, wind profilers, SODARS, or commercial tethersondes, among others. Lower cost instruments open the possibility of obtaining more quality data, useful for atmospheric processes studies and in numerical weather prediction activities. This paper describes the design of a low cost tethersonde useful in maintaining the continuous monitoring of boundary layer for processes studies and weather prediction. The viability of the instrument has been shown in meteorological field campaigns on board of an oceanographic vessel.PACS: 92.60.Wc, 92.60.Ry, 92.60.-e
oai:ojs.publicaciones.eafit.edu.co:article/455
2018-12-13T16:22:59Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/455
2018-12-13T16:22:59Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 43-66
Application to visualize an ontology for the human semen analysis domain
Ramos, Esmeralda; Universidad Central de Venezuela
Pereira, Yimmy; Universidad Central de Venezuela
Núñez, Haydemar; Universidad Central de Venezuela
Castro, Marcel; Universidad Central de Venezuela
Casañas, Roberto; Universidad Central de Venezuela
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/455
ontology
ontology visualization
Methontology
Protégé
human semen.
es_ES
The following work presents the design and implementation of an ontology for human semen analysis whose objective is to present, organize, formalize and standardize the domain knowledge, in order to be shared and reused by different groups of people and software applications. To visualize this ontology, a Web application based on a client/server architecture was developed, which is constituted by an administration and a public access module. The ontology web site is maintained throughout the administration module whereas the public access module allows users to access the stored knowledge and a group of resources such as images, videos, domain related articles, tutorials and laboratory protocols. The proposed architecture facilitates the observation and recovering of complex knowledge structures as well as the navigation and administration of the information presented in the ontology. The approach used for the design of the information retrieval mechanisms is oriented to both expert and inexpert users. This functionality is of special interest given the heterogeneous of the audience towards this ontology is oriented which includes, among others, health sciences students and professionals. Methontology methodology was selected in order to develop this ontology, using Protégé editor for its implementation.PACS: 07.05.Rm, 07.05.Pj, 07.05.TpMSC: 68Txx, 68Uxx
oai:ojs.publicaciones.eafit.edu.co:article/456
2018-12-13T16:22:57Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/456
2018-12-13T16:22:57Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 67-85
Some improper integrals with integration infinity limit involving generalizad hypergeometric function 2R1(a, b; c; τ ; z)
Castillo Pérez, Jaime; Universidad de la Guajira
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/456
generalized hypergeometric function
improper integrals.
es_ES
In 1991 M. Dotsenko presented a generalization of Gauss’ hypergeometric function refered as 2Rτ1(z), and established its representation in series and integral. It is important to remark that in 1999 Nina Virchenko and, later in 2003, Leda Galu´e considered this function by introducing a set of recurrence and differentiation formulas; they permit simplify some complicated calculus. Kalla et al estudied this function and they presented a new unified form of the gamma function. Later in 2006, Castillo et al present some simple representation for this function. Along this paper work some improper integrals with integration infinity limit involving generalized hypergeometric function2R1(a, b; c; τ ; z) are displayed.MSC: 33D15, 33D90, 33D60, 34M03, 62E15
oai:ojs.publicaciones.eafit.edu.co:article/457
2018-12-13T16:22:56Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/457
2018-12-13T16:22:56Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 5-28
Obtención y caracterización de un polímero biodegradable a partir del almidón de yuca
Ruiz Avilés, Gladys; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/457
biodegradable polymers
tapioca starch
polymer characterization
extrusion.
es_ES
This study focuses on the preparation of tapioca starch biodegradable polymer,processed by blends of starch modified with glycerine and water as plasticizers, by using roll mill and a single–screw extruder in the process. During extrusion, there is a series of variables to control namely: the barrel temperature profile, screw torque and screw rotation speed. Tensile test, Differential Scanning Calorimetric (DSC), Thermogravimetric Analysis (TGA), Fourier Transformer Infrared Spectroscopy (FTIR) and morphology were used in the process.PACS: 81.70.Pg, 87.85.J-
oai:ojs.publicaciones.eafit.edu.co:article/458
2018-12-13T16:22:55Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/458
2018-12-13T16:22:55Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 29-41
Optimal reinforcing of reticular structures
García, Manuel Julio; Universidad EAFIT
Mejía, Juan Santiago; Research Assistant, Department of Industrial and Enterprise Systems, University of Illinois at Urbana-Champaign
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/458
Structural optimisation
reticular structures
reinforced struc- tures
genetic algorithms
es_ES
This article presents an application of Genetic Algorithms (GA) and Finite Element Analysis (FEA) to solve a structural optimisation problem on reticular plastic structures. Structural optimisation is used to modify the original shape by placing reinforcements at optimum locations. As a result, a reduction in the maximum stress by 14,70% for a structure with a final volume increase of 8,36% was achieved. This procedure solves the structural optimisation problem by adjusting the original mold and thereby avoiding the re-construction of a new one.PACS: 02.60.PnMSC: 65-XX
oai:ojs.publicaciones.eafit.edu.co:article/459
2018-12-13T16:22:54Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/459
2018-12-13T16:22:54Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 87-110
System of acquisition of information for measurement of radioelectric parameters in linear antennas in the band of VHF and UHF’s television
Montes Granada, Willer Ferney; Universidad de Ibagué–Coruniversitaria
Celemín, María del Pilar; Universidad de Ibagué–Coruniversitaria
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/459
linear antenna
system of automatic laying
bands of VHF and UHF
radioelectric level of intensity of electric field
parameters
pattern of radiation.
es_ES
This project develops a data acquisition and processing system for measuring and adjusting lineal-antenna radioelectric parameters in VHF and UHF. Television signals are used as test signal. They can be found in radio electric spectrum, as they come from commercial transmitters that broadcast signals of national channels. The achieved receptor includes a television commercial tuner for obtaining video signal. Later, this signal is conditioning to be read from a personal computer through the serial port. A software developed under Visual Basic 6.0 process the acquired data by an A/D converter of the one microcontroller PIC. At the same time, the microcontroller controls the antenna positioning mechanism. The mentioned blocks form a system for determining the optimal antenna orientation for maximum signal reception, automatically. Also, this system determines antenna’s parameters such as radiation pattern in both horizontal plane and vertical plane, maximum directive gain, gain on each point of the principal plane. Others parameters necessary to a real lineal antennas analysis are take into account as well.PACS: 84.40.BaMSC: 93C85
oai:ojs.publicaciones.eafit.edu.co:article/460
2018-12-13T16:22:52Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/460
2018-12-13T16:22:52Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 43-57
Poschl-Teller potentials based solution to Hilbert's tenth problem
Sicard, Andrés; Universidad EAFIT
Ospina, Juan
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/460
Hypercomputation
adiabatic quantum computation
Hilbert’s tenth problem.
es_ES
Hypercomputers compute functions or numbers, or more generally solve problems or carry out tasks, that cannot be computed or solved by a Turing machine. An adaptation of Tien D. Kieu¿s quantum hypercomputational algorithm is carried out for the dynamical algebra su(1, 1) of the Poschl-Teller potentials. The classically incomputable problem that is resolved with this hypercomputational algorithm is Hilbert¿s tenth problem. We indicated that an essential mathematical condition of these algorithms is the existence of infinitedimensional unitary irreducible representations of low dimensional dynamical algebras that allow the construction of coherent states of the Barut-Girardello type. In addition, we presented as a particular case of our hypercomputational algorithm on Poschl-Teller potentials, the hypercomputational algorithm on an infinite square well presented previously by the authors.PACS: 03.67.LxMSC: 35Q15, 68Q12
oai:ojs.publicaciones.eafit.edu.co:article/461
2018-12-13T16:22:51Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/461
2018-12-13T16:22:51Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 111-133
Error Model in Wavelet-compressed Images
Villegas G., Jairo; Universidad EAFIT
Puetamán G., Gloria; Universidad de San Buenaventura
Salazar E., Hernán; Universidad de San Buenaventura
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/461
wavelet
compression of images
observed image
compression linear and nonlinear.
es_ES
In this paper we study image compression as a way to compare Wavelet and Fourier models, by minimizing the error function. The particular problem we consider is to determine basis {ei} minimizing the error function between the original image and the recovered one after compression. It is to be noted or remarked that there are many applications in such diverse fields as for example medicine and astronomy, where no image deteriorating is acceptable since even noise is considered essential.MSC: 30H25, 65Txx, 65T60
oai:ojs.publicaciones.eafit.edu.co:article/462
2018-12-13T16:22:50Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/462
2018-12-13T16:22:50Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 59-74
Alternative proposal for including a risk-equalizing criterion in the computation of the power dispatch for the colombian electricity market
López Lezama, Jesús María; Universidad de Antioquia
Murillo S., Carlos E.; Universidad Autónoma de Manizales.
Zuluaga L., Luis J.; Proyectos–Gerencia Centro Nacional de Despacho, ISA.
Gutierrez G., Jorge F.; Universidad Nacional de Colombia, sede Manizales.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/462
optimal power flow
power systems optimization
power systems modeling.
es_ES
The energy dispatch process in Colombia is carried out in four different stages. Electrical and reliability constraints are added at each stage. One of the most important characteristics of the dispatch process is the inclusion of a balanced risk policy. The dispatch must be calculated so that the expected relative load sheddings in the different sub-areas of the system are minimized and equalized. This paper presents a lineal optimization model that solves the dispatch problem in one single stage and incorporates the balanced risk policy mentioned above.PACS: 88.80.H-
oai:ojs.publicaciones.eafit.edu.co:article/463
2018-12-13T16:22:48Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/463
2018-12-13T16:22:48Z
Universidad EAFIT
Vol. 3 No. 5 (2007); 135-144
Implementation of the parametric representation of the Fourier transform in fabrics
Cárdenas, L. J.; Universidad Industrial de Santander
Cifuentes, L. E.; Universidad Industrial de Santander
Torres Moreno, Yezid; Universidad Industrial de Santander
Escofet, J.; Universitat Politècnica de Catalunya
Millán García-Varela, María Sagrario; Universitat Politècnica de Catalunya
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/463
fabrics
Fourier transform
parametric representation
textures.
es_ES
The periodic nature of the fabric images allows using fast Fourier transform techniques in image processing for its characterization. Due to the repetition of patterns inside the images of textile, is possible to find a form relatively easy of description in their energy spectrum. A recent work outlines a group of geometric descriptors for the Fourier spectrum of the images; looking for this efficiency to rotation, translation and scale change invariance [1]. These descriptors showed to be very effective to represent a textile fabric and can be used to characterize the quasi periodic textures in real time and in situ non destructive techniques. Samples of textile textures are tested to this technique of parametric representation with the purpose of analyzing their robustness and reproducibility. Finally, a set of textile fabrics is subjected to this model with the aim of evaluating the possibilities to carry out classification, verification and pattern recognition.PACS: 42.30.Kq
oai:ojs.publicaciones.eafit.edu.co:article/464
2018-12-13T16:22:47Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/464
2018-12-13T16:22:47Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 75-94
Algunas representaciones simples de la función hipergeométrica generalizada 2R1 (a, b; c; τ ; x)
Castillo Pérez, Jaime; Universidad de la Guajira
Jiménez Ruiz, Carlos; Universidad de la Guajira
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/464
generalized hypergeometric function
simple representations.
es_ES
The field of especial functions have had a remarkable development during the last deacades because there are many phenomena that can be studied through ont the use of these functions themselves, such as related stochastics processes, operational research, queuing theory, functional equations, vibrations of plates, heat conduction, elasticity, and radiation. Along this paper work, an extension of the theories presented by M. Dotsenko en 1991 is considered. M. Dotsenko introduced the generalization of the hypergeometric function of Gauss referred as 2Rτ1 (z), and he established it representation in series and integral. It is important to remark that in 1999 Nina Virchenko and, later in 2003, Leda Galu´e considered this function by introducing a set of recurrence and differentiation formulas. Along this paper work some simple representations of the function 2R1(a, b; c; τ ; z) are displayed, which will be very useful for future researchers since they permit simplify calculus at the time of solving problems involving this function.MSC: 33D15, 33D90, 33D60, 34M03, 62E15
oai:ojs.publicaciones.eafit.edu.co:article/465
2018-12-13T16:22:46Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/465
2018-12-13T16:22:46Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 95-123
Una solución económica a los problemas de calidad del servicio del suministro de energía eléctrica
Barrera Núñez, Víctor; Asesor Programa Nacional de Investigaciones en Energía y Minería, Colciencias, Asistente de Investigación GISEL.
Mora Flórez, Juan José; Universidad Tecnológica de Pereira
Carrillo, Gilberto; Universidad Industrial de Santander
Ordóñez Plata, Gabriel; Universidad Industrial de Santander
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/465
power quality
multivariable classification
electric energy service continuity
quality indexes
artificial intelligence
faults location
LAMDA technique.
es_ES
This paper proposes a methodology to build hybrid models to fault location in power distribution systems, this methodology will allow to the utilities improve their quality indexes corresponding energy service continuity (DES and FES indexes). The hybrid model in methodology is composed by a technique based on knowledge (LAMDA tecnique) and other based on model (Ratan Das algorithm). The LAMDA technique is a technique based on artificial intelligence inheriting characteristics of the fuzzy logic and neural networks. The Rantan Das algorithm, is fault location algorithm that estimate the fault location from voltage and current phasors in the moment of fault and moreover some electric parameters of the distribution system. The novel thing of the methodology is centred in which with the implementation of the hybrid model is improved the precision in the estimation of the fault location, due to that is reduced the multiple estimation of the fault location algorithm by the technique based on knowledge. Finally, are presented the results obtained in test realized with a distribution circuit of 24 kV and length 60 km, approximately.PACS: 02., 02.10.-vMSC: 03-XX, 03B52, 62-xx, 68Txx
oai:ojs.publicaciones.eafit.edu.co:article/466
2018-12-13T16:21:46Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/466
2018-12-13T16:21:46Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 25-43
Symmetry and new solutions of the equation for vibrations of an elastic beam
Sukhomlin, Nykolay; Universidad Autónoma de Santo Domingo
Alvarez, José R.; Universidad de Puerto Rico
2009-06-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/466
operators of symmetry
Cauchy problem and symmetry
parallelism between equations
Ansatz method.
es_ES
In this short paper it is studied the “not Lie” symmetry of the beam equation. All operators of symmetry linear differential until third order are constructed. It is noted that the resolution of this equation reduces to finding solutions of two Kolmogorov equations. Several class of new solutions of the beam equation are found, particularly those that verify the law of conservation of the initial areolar speed and other that verify the law of conservation of the initial elasticity. It is showed the equivalence between the solution of the problem Cauchy and the existence of a specific symmetry. It is found a parallelism between the beam equation and the wave equation. Using the Ansatz method a wide new family of exact solutions is built. This family includes particularly the solutions which describe the propagation of damped waves. All results of this paper are new.PACS: 43.40.+sMSC: 83C05, 82B23
oai:ojs.publicaciones.eafit.edu.co:article/467
2018-12-13T16:22:45Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/467
2018-12-13T16:22:45Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 45-54
Some indefined integrals containing to the generalized hypergeometric function
Castillo Pérez, Jaime; Universidad de la Guajira
Galué, Leda; Universidad del Zulia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/467
generalized hypergeometric function
recurrence relations
indefined integrals.
es_ES
In 1999 Nina Virchenko have considered the τ-generalization of Gauss hypergeometric function 2R1(a, b; c; τ ; z) with a set of recurrence relations and differentiation formulas. In this paper is obtained some indefined integrals associated with the generalized hypergeometric function and some particular cases.MSC: 33D15, 33D90, 33D60, 34M03, 62E15
oai:ojs.publicaciones.eafit.edu.co:article/468
2018-12-13T16:22:43Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/468
2018-12-13T16:22:43Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 55-89
Questions on the logic of the argumentation
Gómez-Marín, Raúl; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/468
non–classical logics
argumentation
rule
validity.
es_ES
In the argumentative theory field is usually said that the logic has not the necessary elements to found the logical bases for the most relevant arguments in use in the juridical, political, and human theories, even the scientific ones. If the term “logic” refers only to the classical logic, of course, the author agrees. But if one takes into account the contributions of the families of non–classical logics, the author does not believe relevant to state categorically that.One can understand why the question that guides this research is the following:Given a theory which has some pretension of objectivity, is it possible to find a“non–classical logical system” having the elements and the structure necessary to model its underlying logic? In this research, it is offered a intermediate answer: yes, it is possible, because the “non–classical logical system” open a way to research the foundation of pragmatic reason. And, no, it is not possible, because it is recognized that in a rational argument are used rules that are not purely logical.MSC: 03Axx, 03B60,
oai:ojs.publicaciones.eafit.edu.co:article/469
2018-12-13T16:22:42Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/469
2018-12-13T16:22:42Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 91-122
The π-geography problem and the Hurwitz problem
Cadavid, Carlos; Universidad EAFIT
Vélez-C., Juan D.; Universidad Nacional de Colombia, Medellín
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/469
branched cover
critical value
Euler characteristic
Riemann–Hurwtiz formula
Hurwitz problem
π–geography
monodromy
es_ES
Let d > 2 be an integer and let π be a partition of d. This article aims to determine for which pairs of integers (a, b) there exists a branched cover F : Σ → D 2 = {z ∈ C : |z| 6 1} with χ(Σ) = −b and having a critical values, such that the monodromy obtained when traversing the boundary of D 2 once and positively belongs to the conjugacy class in the symmetric group Sd determined by π. Four variants of this question are studied: i) without requiring the connectedness of the domain, ii) requiring the connectedness of the domain, iii) without requiring the connectedness of the domain but requiring the semistability of the map, iv) requiring the connectedness of the domain and the semistability of the map. Complete solutions are obtained of the first two variants, and partial solutions are obtained of the remaining variants. The article also explains how these questions arise when analogous questions for maps whose domain is four dimensional are studied.MSC: 11M35
oai:ojs.publicaciones.eafit.edu.co:article/470
2018-12-13T16:22:41Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/470
2018-12-13T16:22:41Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 123-143
Estimation of software projects: a practical case
Salazar-B, Gabriela; Universidad de Costa Rica
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/470
measurements
estimation
planning
software engineering.
es_ES
This article describes a methodology to estimate and plan software projects,as well as the experience in the estimation processes. This experience was realized with the participation of undergraduate students of the Software Engineering course at the university of Costa Rica computer science school. This course focuses on software engineering methodologies, techniques and tools and the students implement a practical project. To estimate the duration of their projects, they use the Function Points technique to measure the size of the application. Afterwards they apply different estimation techniques of the duration to plan their projects. The collected information from this investigation shows the certitude of the applied estimation techniques, when comparing the estimated duration against real duration in two important life cycle milestones (the beginning and the end of the project). The described points in this article can interest leaders, professors, and instructors that want to form future software engineers in the area of software project estimation and planning.PACS: 00, 01
oai:ojs.publicaciones.eafit.edu.co:article/471
2018-12-13T16:22:40Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/471
2018-12-13T16:22:40Z
Universidad EAFIT
Vol. 5 No. 9 (2009); 145-165
Detection of epileptic spikes in electroencephalographic signals for patients with temporal lobe epilepsy using wavelets
Castaño, Nelson Eduardo; Instituto Tecnológico Metropolitano
Zapata, José Fernando; Instituto Tecnológico Metropolitano
Villegas G., Jairo; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/471
multiresolution analysis
biorthogonal wavelet
detection of epileptic spikes.
es_ES
This paper describes a method for detecting epileptic spikes in a record electroencephalographic (EEG) surface by taking a single channel. We identified a pattern using multiresolution analysis with a biorthogonal wavelet after processing and analyzing the Wavelet Toolbox of Matlab, 207 records and 132 records of tips tricks previously classified by Neurophysiologist. This pattern enabled an algorithm for detecting spikes in patients with refractory temporal lobe epilepsy, based on the maximum voltage in each of the six levels of reconstruction using biorthogonal 3.7 wavelet. The algorithm was applied on records of patients with epilepsy, getting a sensitivity of 92% and a specificity of 80% in the diagnosis of epileptic spikes.PACS: 87.57.-sMSC: 65T60, 42C40
oai:ojs.publicaciones.eafit.edu.co:article/472
2018-12-13T16:22:39Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/472
2018-12-13T16:22:39Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 125-144
Dinámica del virus de la hepatitis C con carga viral y ALT y monitoreo del daño hepático libre de biopsias
Alavez-Ramírez, Justino; Universidad Juárez Autónoma de Tabasco
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/472
hepatitis C
viral load
hepatic damage
biopsies
parameters
threshold parameter.
es_ES
The standard model of three populations (healthy and unhealthy hepatocytes, and viral load) for the study of the dynamics of hepatitis C virus (HCV), is compared with viral dynamic model with alanine aminotransferase (ALT). In terms of the threshold parameter that it’s the same for both models, the existence and local asymptotic stability of the endemically infected equilibrium steady state, and the global stability of the healthy individual equilibrium steady state are established. Furthermore, an experimental study is presented showing that it’s possible to carry out the monitoring of hepatic damage biopsies free by numerical parameter estimation, considering only viral load and ALT levels measurements and a reasonable assessment of pretreatment hepatic damage.PACS: 87.19.xdMSC: 97M60
oai:ojs.publicaciones.eafit.edu.co:article/473
2018-12-13T16:22:37Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/473
2018-12-13T16:22:37Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 145-162
Optimización simultánea para la mejora continua y reducción de costos en procesos
Domínguez Domínguez, Jorge; CIMAT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/473
designs of experiments
models
loss function
optimization multi–response
graphic method.
es_ES
Many problems of optimization are characterized by the flexibility to establish the utility among the functions objectives. Experimental strategy plays a very important part for generating theses functions. This specific strategy has also been applied in an important way to reduce costs when desiring quality and its continuous improvement in processes and products. It is common to find many industrial applications with several responses whose purpose is to reach the global level of quality of a product. Therefore it is necessary to simultaneously optimize in a simultaneous the responses that the researcher desires. In essence, the problem of optimization of various responses involves the selection of a set of conditions or independent variables such that give a product or some convenient service an ideal result. The wish is to select the levels of independent variables that optimize all the responses at the same time. Two procedures will be displayed here in order to build a function that represents a combination of the objectives of the individual responses. The first method is a model of optimization multiplicativo and the second additive. These will be applied to two cases of study which will be carried out in the industry for the purpose of pointing out the processes of continuous improvement and the decrease in costs. The simultaneous optimization, using these two procedures, will be illustrated by graphical means. This will allow a generation of several scenarios showing possible optimum solutions. In these examples it was observed that both methods produce similar results when generating the optimum one, however when comparing them in a global way by means of the loss function a slight difference it exists among them.MSC: 62-XX, 62Kxx
oai:ojs.publicaciones.eafit.edu.co:article/475
2018-12-13T16:22:36Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/475
2018-12-13T16:22:36Z
Universidad EAFIT
Vol. 2 No. 4 (2006); 163-178
Sistema paraconsistente LBPc¬I
Sierra A., Manuel; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/475
incompatibility
weak negation
paraconsistent deductive system.
es_ES
The language of the LBPc¬I system extends the language of the classical positive logic when including an operator of weak negation and an operator of incompatibility, and permit to define an operator of strong negation; this last one has all the characteristics of the classical negation. The system is characterized by a traditional semantics with which test that, with respect to the operator of weak negation, the system is paraconsistent. When the formulas involved in an argument behave classically, that is to say, are incompatible with his weak negation, then the weak negation behaves like the classical negation, but this requirement not always is necessary, the weak negation can precise be as powerful as the classical negation although the involved formulas do not behave classically.MSC: 03Bxx, 03B53
oai:ojs.publicaciones.eafit.edu.co:article/476
2018-12-13T16:22:35Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/476
2018-12-13T16:22:35Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 5-27
Método de medicíon de combustible en una embarcacíon fluvial
Pardo González, Mauricio; Universidad del Norte
Manotas Angulo, Vïctor; Universidad del Norte
Campanella Pineda, Humberto; Universidad del Norte
Páez Saavedra, Javier; Universidad del Norte
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/476
level measurement
centroid
test point
pressure sensors.
es_ES
This paper exposes a way to improve the method of fuel measurement in a river vessel, specifically a tugboat. The framework of this article is the need of a strategy to establish the amount of fuel volume that is contained in the tanks of the tugboat. The method, that have been used so far, produces errors influenced by disturbance factors such as the inclination and the shape of the tanks of the tugboat. It is needed to develop an alternative method that reduces the error between the fuel which is provided by the suppliers and the measured one in the tugboat. This new method tries to be independent of the inclination of the boat with no need of using a clinometer or instrument of angle measurement.PACS: 47.10.-g, 46.05.+bMSC: 28Bxx, 44-02, 44A30
oai:ojs.publicaciones.eafit.edu.co:article/477
2018-12-13T16:22:34Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/477
2018-12-13T16:22:34Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 29-38
Proteasas alcalinas de una cepa nativa de Bacillus sp Alcalofílico
Sáez Vega, A.; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/477
Bacillus
proteases
enzymes.
es_ES
The effect of four nitrogen sources on the enzymatic activity of alkaline proteases from a wild strain of Alkalophilic Bacillus sp cultivated to different concentrations from CSL (Corn Steep Liquor). was evaluated. The growth of the strain is not affected by pH of inoculation of 7,0, 8,5 and 9,5, in contrast to the enzymatic activity and true protein production, that had their better results to initial pH of 8,5. To this initial pH of 8,5; two organic nitrogen sources (yeast extract and peptone) and two inorganic ones were evaluated (NH4Cl and NaNO3). With peptone the best enzymatic activity to a relation appeared to molar C/N between 1 and 2 was found. For the studied interval of % CSL (0,5 to 2% p/v) the concentration of the CSL does not affect the enzymatic activity.PACS: 87.17.Uv
oai:ojs.publicaciones.eafit.edu.co:article/478
2018-12-13T16:22:32Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/478
2018-12-13T16:22:32Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 39-50
Método heurístico para restauración del servicio en sistemas de distribución de energía eléctrica
Arango Lemoine, César; Universidad Nacional de Colombia, sede Manizales
López Lezama, Jesús María; Universidad Nacional de Colombia, sede Manizales
González Londoño, Mónica Alejandra; Universidad Nacional de Colombia, sede Manizales
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/478
service restoration
feeder reconfiguration
optimization of distribution systems
reliability of distribution systems.
es_ES
When there is an outage in a radial electrical distribution system, the isolation of the faulted section will result in the isolation of some portions of the feeder downstream from the affected area. Therefore, the next step will be to restore the service to the affected users. This restoration must be done as quickly as possible considering topology and feeder capacity restrictions. This paper describes an algorithm for service restoration via feeder reconfiguration. Results are shown under a distribution system with 11 buses and 3 main feeders.MSC: 78M32
oai:ojs.publicaciones.eafit.edu.co:article/484
2018-12-13T16:22:31Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/484
2018-12-13T16:22:31Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 51-64
Modelo de producción–inventario con tiempo de espera proporcional al tiempo de producción
Laniado, Henry; Universidad de Antioquia
García Suaza, Andrés F.; Universidad de Antioquia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/484
inventory
production
demand
cycles.
es_ES
In this paper is studied an inventory–production model with demand and production rates constants over time. One hypothesis is that waiting time, refereed to the time which the productive unit is off, is proportional to the working time of the same unit. The objective is to develop a mathematical model and to determine optimal number of cycles either minimizing cost or maximizing profit.MSC: 62Mxx, 91B82
oai:ojs.publicaciones.eafit.edu.co:article/486
2018-12-13T16:22:30Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/486
2018-12-13T16:22:30Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 65-71
Identification by force modulation microscopy of nanoparticles generated in vacuum arcs
Arroyave Franco, Mauricio; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/486
force modulation
atomic force
nanoparticle
TiN
Ti. 1
es_ES
An alternative method based on force modulation microscopy (FMM) for identification of nanoparticles produced in the plasma generated by the cathode spots of vacuum arcs is presented. FMM technique is enabled for the detection of variations in the mechanical properties of a surface with high sensitiveness. Titanium nitride (TiN) coatings deposited on oriented silicon by pulsed vacuum arc process have been analyzed. AFM (Atomic Force Microscopy) and FMM images were simultaneously obtained, and in all cases it was possible to identify nanoparticle presence. Further X-ray Diffraction spectra of sample coating were taken. Existence of contaminant particles of 47 nanometers in diameter was reported.PACS: 42.79.Wc, 68.35.Gy
oai:ojs.publicaciones.eafit.edu.co:article/487
2018-12-13T16:22:29Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/487
2018-12-13T16:22:29Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 73-102
Caracterización deductiva de los árboles de forzamiento semántico
Sierra A., Manuel; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/487
tree of forcing
valuation
semantics
deductive system.
es_ES
The classic propositional calculus is characterized by a tool of visual inference called trees of semantic forcing. With this tool the associated nodes of the formula are marked, and with base in these marks it determines if the formula is valid or no. In case of invalidity, the valuation that refutes the validity of the formula is determines by the marks of the leaves in its tree of forcing. In case of validity, a formal deduction of the associated formula to the root of the tree can be constructed, this is possible because each used rule to mark the nodes in the tree is associate to a rule of inference in the deductive system.MSC: 03BXX, 03B10
oai:ojs.publicaciones.eafit.edu.co:article/489
2018-12-13T16:22:27Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/489
2018-12-13T16:22:27Z
Universidad EAFIT
Vol. 2 No. 3 (2006); 103-137
Geometric constraint subsets and subgraphs in the analysis of assemblies and mechanisms
Ruiz, Oscar E.; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/489
graph cycle
Groebner basis
constraint graph
mechanisms
assemblies.
es_ES
Geometric Reasoning ability is central to many applications in CAD/CAM/CAPP environments. An increasing demand exists for Geometric Reasoning systems which evaluate the feasibility of virtual scenes specified by geometric relations. Thus, the Geometric Constraint Satisfaction or Scene Feasibility (GCS/SF) problem consists of a basic scenario containing geometric entities, whose context is used to propose constraining relations among still undefined entities. If the constraint specification is consistent, the answer of the problem is one of finitely or infinitely many solution scenarios satisfying the prescribed constraints. Otherwise, a diagnostic of inconsistency is expected. The three main approaches used for this problem are numerical, procedural or operational and mathematical. Numerical and procedural approaches answer only part of the problem, and are not complete in the sense that a failure to provide an answer does not preclude the existence of one. The mathematical approach previously presented by the authors describes the problem using a set of polynomial equations. The common roots to this set of polynomials characterizes the solution space for such a problem. That work presents the use of Groebner basis techniques for verifying the consistency of the constraints. It also integrates subgroups of the Special Euclidean Group of Displacements SE(3) in the problem formulation to exploit the structure implied by geometric relations. Although theoretically sound, these techniques require large amounts of computing resources. This work proposes Divide-and-Conquer techniques applied to local GCS/SF subproblems to identify strongly constrained clusters of geometric entities. The identification and preprocessing of these clusters generally reduces the effort required in solving the overall problem. Cluster identification can be related to identifying short cycles in the Spatial Constraint graph for the GCS/SF problem. Their preprocessing uses the aforementioned Algebraic Geometry and Group theoretical techniques on the local GCS/SF problems that correspond to these cycles. Besides improving the efficiency of the solution approach, the Divide-and-Conquer techniques capture the physical essence of the problem. This is illustrated by applying the discussed techniques to the analysis of the degrees of freedom of mechanisms.MSC: 68U07
oai:ojs.publicaciones.eafit.edu.co:article/492
2018-12-13T16:22:25Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/492
2018-12-13T16:22:25Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 5-23
Edge and corner identification for tracking the line of sight
Orozco, María S; Universidad de Vigo
Ruiz Salguero, Oscar Eduardo; Universidad EAFIT
Jasnoch, Uwe; GIStec
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/492
image synthesis techniques
computer vision
edge detection
feature detection.
es_ES
This article presents an edge-corner detector, implemented in the realm of the GEIST project (an Computer Aided Touristic Information System) to extract the information of straight edges and their intersections (image corners) from camera-captured (real world) and computer-generated images (from the database of Historical Monuments, using ob- server position and orientation data). Camera and computer-generated images are processed for reduction of detail, skeletonization and corner-edge detection. The corners surviving the detection and skeletonization process from both images are treated as landmarks and fed to a matching algorithm, which estimates the sampling errors which usually contaminate GPS and pose tracking data (fed to the computer-image generatator).PACS: 07.05.PjMSC: 68Uxx, 68U05, 68U10
oai:ojs.publicaciones.eafit.edu.co:article/493
2018-12-13T16:22:02Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/493
2018-12-13T16:22:02Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 25-40
Oxidación fotocatalítica de aguas residuales de la industria de lavandería utilizando TiO2 como catalizador y luz UV1
Gil Pavas, Edison; Universidad EAFIT
2005-12-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/493
Advanced oxidation processes
photocatalysis
photo-oxidation
COD
waste-water
UV
titanium dioxide.
es_ES
The catalytic photodegradation of the waste water of the laundry industry in a Parabolic Composite Cylinder (PCC) photo-reactor is studied in this work. The technology of pho-tocatalysis was used with artificial sources of radiation (lamps UV) and TiO2 as catalyst. The study was with Industrial waste water with the objective to begin to carry out an investigation with real liquid effluents and not with prepared synthetic mixtures in the laboratory, since what it looks for with this project it is to take a first step towards the use of these new technologies on industrial scale. The experimental results were process statistically by model of response surface. The concentration of catalyst, pH and the recirculation time were the parameters that affected the final concentration of COD, variable of response. The degradation obtained was 26.49% without H2O2 and 41.8%. with addition of H2O2.PACS: 81.16.Hc, 89.60.-k, 92.20.Ny
oai:ojs.publicaciones.eafit.edu.co:article/494
2018-12-13T16:22:24Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/494
2018-12-13T16:22:24Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 41-51
Descripción del diseño y construcción de un torno de control numérico
Londoño Ospina,, Nelson; Universidad de Antioquia
León Simanca, Pedro; Universidad de Antioquia
Alvarez Díaz, Jairo; Tecnológico de Antioquia
Marín Zapata, Edwin; POLCO S.A.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/494
CAD
CNC
interface man-machine
lathe
microcontroller.
es_ES
Here we present the implementation and results of a numerical control system locally built and the electronic system are explained. With further detail it is explored the software used to make chess pieces, based on drawings created with any graphic designs software. Additionaly, we describe basic algorithms and concepts refering to the conversion displacement units of the system actuator, besides of the graphic interface that cases the inter-relation between the user (designer) and the CAD system.MSC: 68Nxx, 68U07
oai:ojs.publicaciones.eafit.edu.co:article/495
2018-12-13T16:22:22Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/495
2018-12-13T16:22:22Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 53-66
Metodología para la manufactura de implantes craneales a partir de imágenes DICOM y tecnologías CAD/CAM/CNC
Rodríguez López, Carlos; Universidad EAFIT
López, Iván; Universidad EAFIT
Sierra, Alejandro; Representaciones C.G.S.A.
Maya, Jairo; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/495
medical cranial implants
CAD/CAM/CNC systems
DICOM.
es_ES
It’s proposed a methodology in order to design and manufacture cranial implants using DICOM and CAD/CAM/CNC technologies. This methodology begins when the designer makes a three-dimensional cranial reconstruction using the Axial Computer Tomographies (ACT) of the patient’s cranium. Next, using a CAD system, the designer rebuilds the implant varying the used technique depending on the affected region. Finally, the designer builds the assembling and manufactures the implant.MSC: 68Nxx, 68U07
oai:ojs.publicaciones.eafit.edu.co:article/496
2018-12-13T16:22:21Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/496
2018-12-13T16:22:21Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 67-81
Una primera lección de Geometría Algebraica
Cadavid, Carlos; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/496
Algebraic systems
change of variable methods
equivalence of algebraic systems
Gröbner basis
affine varieties and their morphisms
equivalence of affine varieties.
es_ES
This paper explains how Algebraic Geometry originated from the study of solution sets of algebraic systems.MSC: 14-XX,
oai:ojs.publicaciones.eafit.edu.co:article/497
2018-12-13T16:22:20Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/497
2018-12-13T16:22:20Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 83-96
Transformación bainítica en aleaciones Fe-C
Viáfara, Cristian; Universidad Nacional de Colombia
Vélez, Juan Manuel; Universidad Nacional de Colombia
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/497
bainite
austempering ductile iron
retained austenite
incomplete reaction phenomenon.
es_ES
Some alloys Fe-C have an excellent combination of toughness and strength, related to bainitic reaction products, being useful in manufacturing of machine components subjected to high stresses. However, in our medium the knowledge of this transformation is reduced; it makes difficult a competition of industrial sector in the global economy. In this work it has been made a summary of basic issues of bainitic reaction, further to the review of classic books of phase transformations and considering last advances that it has been realized in its study. In addition, it’s compiled the issues more important of bainite as in steels as much as in ductile irons. It is discussed the reaction mechanisms, reaction kinetic, microstructure characteristics and mechanical properties. The goal is diffuse notions and techniques required to implantation of this phase transformation, promoting the bainitic products development.PACS: 81.05.Bx
oai:ojs.publicaciones.eafit.edu.co:article/498
2018-12-13T16:22:19Z
ingciencia:ART
driver
v2
https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/498
2018-12-13T16:22:19Z
Universidad EAFIT
Vol. 1 No. 2 (2005); 97-103
Análisis de falla en cable de acero
Ossa, E. A.; University of Nottingham
Paniagua, M A.; Universidad EAFIT
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/498
wire ropes
failure analysis
mechanical testing
metallography
fractography.
es_ES
This paper describes the failure analysis of two wire ropes fractured during normal working conditions. The failure was caused by a load well below the nominal maximum resistance of the ropes. Optical microscopy indicated fatigue failure of one of the cables.MSC: 81.70.Bt
3eb0735ba25a3261253d621c447cc152