Ingeniería y Ciencia
http://publicaciones.eafit.edu.co/index.php/ingciencia
<p>The Ingeniería y Ciencia journal targets the academic, scientific and industrial communities involved in the fields of Science and Engineering. </p>en-US<span>Authors who publish with this journal agree to the following terms:</span><br /><ul><li>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a <a href="http://creativecommons.org/licenses/by/3.0/" target="_new">Creative Commons Attribution License</a> that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</li><li>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.</li><li>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 <a href="http://opcit.eprints.org/oacitation-biblio.html" target="_new">The Effect of Open Access</a>).</li></ul>ingciencia@eafit.edu.co (Heiner José Mercado Percia)ingciencia@eafit.edu.co (Sara Acevedo)Tue, 14 Nov 2017 00:00:00 -0500OJS 3.0.2.0http://blogs.law.harvard.edu/tech/rss60 Solving the Kirsch Problem with Mesh-free Elements Using Radial Base Interpolation Functions
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4641
<p>The problem of Kirsch published in 1898, is used as a basis for corroborating the relative precision of numerical methods developed in the mechanics of solids. For this reason, the solution of this problem is used to evaluate the accuracy of the Mfree numerical method with a function of form using the radial points of interpolation, in the mesh-free numerical method. The radial points of interpolation method (RPIM) is an interpolation technique used to construct form functions with locally distributed nodes in a weak formulation that allows the representation of the problem as a system of equations. The most common type of functions are the polynomial functions or MQ radial basis functions (RBF), which was used for the stability it presents at the moment of solving the problem numerically. The most common type of functions are the polynomial functions or radial basis functions (RBF), which was used for the stability it presents at the moment of solving the problem numerically. To make the comparison we used the analytical solution given by Kirsch and the numerical solution developed in the present work, obtained an error of 0.00899%, which shows that the Mfree technique with radial bases of interpolation MQ are accurate and reliable when used as a numerical method of analysis. </p>Fabio H Realpe, Yasser H Ochoa, Francisco Franco, Pedro J Díaz
Copyright (c) 2017 Fabio Hernán Realpe, Pedro José Díaz, Yasser Halil Ochoa Muñoz, Francisco Franco
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4641Tue, 14 Nov 2017 00:00:00 -0500 Solving a Classical Optimization Problem Using GAMS Optimizer Package: Economic Dispatch Problem Implementation
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4691
<p>This paper presents an effectiveness strategy to model and solve nonlinear mathematical optimization problems in electrical engineering using General Algebraic Modeling System (GAMS) for undergraduate students. A classical problem known as economic dispatch has been selected to show the need of using mathematical tools to solve a large scale optimization problem related with engineering. The economic dispatch is a classical optimization problem in operation of thermal electric systems, being the main idea to find an economical operation for thermal generators. This operation is based on a quadratic cost curve with some operating constraints, i.e., power balance and generation capacities. A numerical simulation is implemented using GAMS optimization package in demo version. This research has been developed with the support of 36 students of the course of Regulation and Operation of Electrical Systems (ROES) in the program<br>of Electrical Engineering at Universidad Tecnológica de Pereira (UTP).</p>Oscar Danilo Montoya Giraldo, Mag.
Copyright (c) 2017 Oscar Danilo Montoya Giraldo
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4691Tue, 07 Nov 2017 00:00:00 -0500 Numerical Methods Coupled with Richardson Extrapolation for Computation of Transient Power Systems
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4808
<p>The numerical solution of transient stability problems is a key element for electrical power system operation. The classical model for multi-machine systems is defined as a set of non-linear differential equations for the rotor speed and the generator angle for each electrical machine, this mathematical model is usually known as the swing equations. This paper presents how to use direct Richardson extrapolation of several orders for the numerical solution of the swing equations and compares it with other commonly used implicit and explicit solvers such as Runge-Kutta, trapezoidal, Shampine and Radau methods. A numerical study on a simple three machine system is used to illustrate the performance and implementation of algebraic Richardson extrapolation coupled to several solution methods. Normally, the order of accuracy of any numerical solution can be increased when Richardson Extrapolation is used. A numerical example is provided for an electrical grid consisting of three machines and nine buses undergoing a disturbance. It is shown that in this case Richardson extrapolation effectively increases the order of accuracy of the explicit methods making them competitive with the implicit methods. </p>Whady Felipe Florez, Jorge W Gonzalez, Alan F Hill, Gabriel J Lopez, Juan D Lopez
Copyright (c) 2017 Whady Felipe Florez, Jorge W Gonzalez, Alan F Hill, Juan D Lopez, Gabriel J Lopez
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4808Tue, 14 Nov 2017 00:00:00 -0500 Design of a Network of Reverse Logistics: Case Study Usochicamocha - Boyacá
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4665
<p>This paper presents the final results of an advance investigation in the Usochicamocha irrigation district of the Department of Boyacá - Colombia, which faces a problem because of the non - return and collection of al the empty packaging and packaging of pesticides that generate the farmers. Due to the above, the research proposes a configuration and operation of the reverse logistics network (LI) for the collection, collection and final disposal of pesticide residues in that area, for which a linear programming model was developed mixed in order to define both the quantities to be collected and transported to final disposal and to evaluate the possibility of opening new collection centers. The results of the mathematical model show that, on average, 5 kg of waste are collected on each farm and 1106.58 kg are sent to safe disposal and 1292.31 kg to be recycled.</p>Julián David Silva Rodríguez
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4665Tue, 14 Nov 2017 00:00:00 -0500 Integration of Renewable Energies and its Impact on Electricity Price
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4651
<p>Non-conventional sources of renewable energy (NCER) are energy sources considered as a clean alternative for the energy supply versus an electric generation based on fossil fuels. In addition, they are a way by which<br>the concentration level in the market is reduced and the participation of the demand can be given. This article presents different mechanisms of integration of these sources in the market, and analyzes their effect on the electricity price in Colombia. Under defined simulation conditions, the results indicate that a 20% hare of the USRE in the coverage of demand on a distributed basis generates a 22% reduction in the electricity price for a long term. </p>Santiago Hoyos, Carlos Jaime Franco; Isaac Dyner
Copyright (c) 2017 Santiago Hoyos, Carlos Jaime Franco, Isaac Dyner
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4651Tue, 14 Nov 2017 00:00:00 -0500 A Generalized Model and Control for Supermagnetic and Supercapacitor Energy Storage
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4813
<p>This paper presents a generalized linear model based on LMI state-feedback with integral action, applicable to the control of Electric Energy Storage Systems (EESS) such as Superconducting Magnetic Energy Storage<br>(SMES) and Supercapacitor Energy Storage (SCES). A Voltage Source Converter (VSC) and a Pulse-Width modulated Current Source Converter (PWM-CSC) are respectively used to integrate the SCES and the SMES<br>systems to the electrical distribution system. To represent the dynamics between the EESS and the power distribution system a reduced general linear model in the state-space representation is introduced. The proposed control scheme regulates independently the active and reactive power ow between the EESS and ac the grid. Three case scenarios comparing a conventional PI controller and the proposed technique are conducted considering grid voltage uctuations. Extensive time-domain simulations demonstrate the robustness and proper performance of the proposed controller to operate the EESS as power compensator, in order to improve the operative conditions of electrical distribution systems. </p>Walter Julián Gil González, Alejandro Garcés, Andrés Escobar
Copyright (c) 2017 Walter Julián Gil González, Alejandro Garcés, Andrés Escobar
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4813Wed, 08 Nov 2017 00:00:00 -0500 Methodology for Landslide Susceptibility Assessment Along Linear Projects
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4668
<p>Landslides are characterized by their capacity to generate losses. In Colombia, a considerable percentage of those are associated with linear projects; between 2010-2011, 575 municipalities were affected by damage to the infrastructure of water supply network and sanitation. Considering this serious problem related to linear projects, the present work proposes the combination of heuristic, statistical and physical based methods to evaluate the susceptibility and hazard of landslides, under different scales of analysis. In addition to the construction of a critical unit map, using as the unit of analysis the Independent Morphodynamic Unit. The obtained model is validated using the success curves and the Area Under the Curve (AUC). The proposed methodology was implemented in the pipeline of the municipal aqueduct of the municipality of Fredonia in the Antioquia region. It was identified 6% of areas, both unstable and very high and high susceptibility; and 13% of areas corresponding to both cataclinal over dip and pure dip slope, as well as areas of very high and high susceptibility. The AUC for the conditional analysis and the criticality map showed a value of 0.81 and 0.73 indicating a very good fit and performance of the models.</p>Juliana Mendoza Ramirez, Edier Vicente Aristizábal Giraldo
Copyright (c) 2017 Juliana Mendoza Ramirez, Edier Vicente Aristizábal Giraldo
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4668Wed, 08 Nov 2017 00:00:00 -0500A Guide to Study Iron Oxide Magnetic Nanoparticles with Biomedical Applications. Part II
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4921
<p>In this second part, the magnetic nanoparticles characterization is studied, doing special emphasys in the properties interpretation in order to define the nanosystems applications. In the case of the iron oxide magnetic nanoparticles, the influence of its properties in the heat dissipation under radiofrequency fields is analyzed, this answer is usefull in the cancer treatment by magnetic hyperthermia. In the magnetic hyperthermia treatment, particles absorb energy from a radio frequency magnetic field and dissipate it as heat. For in-vivo test and human assays, frequency ranges between 50 and 1000 kHz and field amplitudes ranges between 5 and 150 kHz are usually used. The main properties, such as magnetization, interactions between particles and particles structuring are studied using experimental data, computational simulations and suitable models for each case studied in the part I of this article. Finally, a correlation<br>between these properties with heat dissipation, measured by calorimetric methods, which is the merit parameter to quantify the electromagnetic energy transduction into heat, is pointed out. </p>Diego F Coral, Jenny A Mera
Copyright (c) 2017 Diego F Coral, Jenny A Mera
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4921Tue, 07 Nov 2017 00:00:00 -0500 Role of Mitochondrial Function in the Heart and its Impications in Cardiac Dysfunctions
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4601
<p>In this review article, we examined the role of mitochondria in the good functioning of the heart, and in the generation of various cardiac conditions, which are characterized by low energy production by the mitochondria and therefore, there is an increase in the loss of cardiomyocytes that leads to malfunction of the heart. It has been determined that certain mitochondrial dysfunctions associated with cardiac disorders are related to alterations of the oxidative phosphorylation system, as well as to the reduction of certain structural components such as cardiolipin and the formation of supercomplexes. It is estimated that about 2.3% of the Colombian population may present prevalence to heart failure. The objective of the present<br>review is to present the investigative advances related to cardiac diseases caused by mitochondrial dysfunction, as well the identification of different investigations directed at the creation of treatment alternatives for these pathologies, all in order to contribute to the construction of lines of work that take the mitochondria as a therapeutic target.</p>Mariana Cañas Arboleda, Nicolás D Franco-Sierra
Copyright (c) 2017 Mariana Cañas Arboleda, Nicolás D. Franco-Sierra
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4601Tue, 07 Nov 2017 00:00:00 -0500 From Obtaining to Degradation of PHB: Material Properties. Part I
http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4652
<p>This paper presents a review of the chemical, physical and morphological characteristics, as well as the existing applications and mechanisms for the production of poly (3-hydroxybutyrate). This biopolymer, which is obtained from renewable sources, degrades when exposed in biologically active environments and is biocompatible, that is, it is not rejected by the human body in health applications. However, in spite of presenting similar properties with some conventional plastics, the PHB exhibits fragile behavior and thermal instability when processed. The literature proposes the use of blends, the development of copolymers or the insertion of additives in an attempt to improve the mechanical and thermal properties of PHB.</p>Antonio José dos Santos, Luiz Veriano Oliveira Dalla Valentina, Andrey Alayo Hidalgo Schulz, Márcia Adriana Tomaz Duarte
Copyright (c) 2017 Antonio José Santos, Luiz Veriano Oliveira Dalla Valentina, Andrey Alayo Hidalgo Schulz, Márcia Adriana Tomaz Duarte
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http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4652Tue, 07 Nov 2017 00:00:00 -0500