Panindicuaro de la Reforma, Mexico

Ibero-American University of Mexico
Panindicuaro de la Reforma, Mexico

The Ibero-American University is a prestigious Mexican private institution of higher education sponsored by the Society of Jesus. Its flagship campus is located in the Santa Fe district of Mexico City but there are others located in Guadalajara, León, Torreón, Puebla and Playas de Tijuana. Its main library, Biblioteca Francisco Xavier Clavigero, holds more than 250,000 books and journals. It is one of the largest law libraries in Mexico and as of 2007, it is one of the largest university libraries in the country. Wikipedia.

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Mulia-Soto J.F.,National Autonomous University of Mexico | Flores-Tlacuahuac A.,Ibero-American University of Mexico
Computers and Chemical Engineering | Year: 2011

Ethanol produced from biomass is one of the most promising renewable fuels. However, most of the proposed separation methods use volatile organic compounds as solvents. Because such solvents are environmentally hazardous, new, efficient and sustainable ways of alcohol purification process ought to be developed. Ideally, no solvent should be required for the high purity purification of alcohol aqueous solutions. Therefore, in this work the modeling, simulation and control of an internally heat integrated pressure-swing distillation (IHIPSD) process to separate the ethanol/water azeotropic binary system into a high purity ethanol stream are addressed. By means of the proposed separation process, high-purity ethanol, suitable for use in the transportation sector, is obtained. Despite the high interaction between the column sections, the results show that the proposed separation process can be operated smoothly with an array of PI controllers. Moreover, the purity of ethanol is maintained with the control structure proposed in the face of upsets. © 2011 Elsevier Ltd.

Positive psychology studies peoplés optimal functioning. It uses the scientific method to research positive experiences, traits and institutions. "Constructive therapies" include solution focused, narrative and collaborative therapies. These approaches focus on building upon exceptions to problems, inquire about clients strengths and resources and are based on the premise that people want to have good relationships and full lives. This article discusses why and how positive psychology and constructive therapies, despite coming from different intellectual traditions, can enrich each other and be integrated in clinical work. © 2013 by Sociedad Chilena de Psicología Clínica.

Tejero M.E.,Instituto Nacional Of Medicina Genomica | Tejero M.E.,Ibero-American University of Mexico
Nutrition, Metabolism and Cardiovascular Diseases | Year: 2010

Cardiovascular disease is a leading cause of death and disability in adults in Latin America. Women are more affected by these diseases than by all forms of cancer. Latin American countries have experienced rapid and uneven socioeconomic changes with a significant effect on lifestyle, demographic and health-related indicators. Differences in methodological approaches make it difficult to compare studies and health statistics across countries in the region. According to available statistics, female population in Latin American countries have lower mortality rate from coronary heart disease and higher mortality rate from cerebrovascular disease than North America. Current rates of obesity and type 2 diabetes are alarming in female in some countries. The high prevalence of risk factors forecasts an increase in cardiovascular disease for the coming decades in this region of the world. More systematic and sustained efforts for research, education, surveillance, prevention, early detection and affordable treatment are required across all Latin American countries to improve health conditions for adult population and particularly for women, who are more affected by obesity and diabetes. This article reviews the available information on cardiovascular disease and related risk factors in Latin American countries with a focus on female and to provide a brief description of selected multinational and national efforts to study and prevent this threat. © 2010 Elsevier B.V.

Molina-Thierry D.P.,Ibero-American University of Mexico | Flores-Tlacuahuac A.,Ibero-American University of Mexico
Industrial and Engineering Chemistry Research | Year: 2015

Because of pollution issues and a forecasted scarcity of fossil fuels, there exists a strong need to consider alternative and sustainable energy sources. Among all the types of alternative energies, normally heat recovery from low-temperature sources is not considered seriously for this purpose because of the poor performance of the conversion to power method. The conventional Rankine cycle that uses water as the working fluid is the most simple way for heat to power conversion. But for low-temperature applications, the conventional Rankine cycle will not achieve good results. In this work, we propose to replace water with a proper optimal combination of a priori selected set of organic fluids as the working fluid. Therefore, the determination of the right type of organic components and the composition of the mixture become decision variables. Moreover, because strong interactions exist between the selection of the type and composition of the organic components and the operating conditions of the Rankine cycle for a given fixed process flowsheet configuration, a simultaneous solution approach will be sought. Hence, by approaching the design problem in a simultaneous rather than in a sequential manner, improved optimal solutions were achieved. The sequential design problem is posed as a nonlinear optimization problem. The proposed methodology is illustrated using three case studies. © 2015 American Chemical Society.

Flores-Tlacuahuac A.,Ibero-American University of Mexico | Grossmann I.E.,Carnegie Mellon University
Industrial and Engineering Chemistry Research | Year: 2010

In this work, we propose a simultaneous scheduling and control optimization formulation to address both optimal steady-state production and dynamic product transitions in continuous multiproduct tubular reactors. The simultaneous scheduling and control problem for continuous multiproduct tubular reactors is cast as a Mixed-Integer Dynamic Optimization (MIDO) problem. The dynamic behavior of the tubular reactor is represented by a set of nonlinear partial differential equations that are merged with the set of algebraic equations representing the optimal schedule production model. By using the method of lines, the process dynamic behavior is approximated by a set of nonlinear ordinary differential equations. Moreover, time discretization of the underlying system allows us to transform the problem into a Mixed-Integer Nonlinear Programming (MINLP) problem. Three multiproduct continuous tubular reactors are used as examples for testing the simultaneous scheduling and control optimization formulation. © 2010 American Chemical Society.

Flores-Tlacuahuac A.,Ibero-American University of Mexico | Grossmann I.E.,Carnegie Mellon University
Industrial and Engineering Chemistry Research | Year: 2011

In this work we propose a simultaneous scheduling and control optimization formulation to address both optimal steady-state production and dynamic product transitions in multiproduct tubular reactors working in several parallel production lines. Because the problem involves integer and continuous variables and the dynamic behavior of the underlying system the resulting optimization problem is cast as a mixed-integer dynamic optimization (MIDO) problem. Moreover, because spatial and temporal variations are considered when modeling the addressed systems, the dynamic systems give rise to a system of one-dimensional partial differential equations. For solving the MIDO problems we transform them into a mixed-integer nonlinear programs (MINLP). We use the method of lines for spatial discretization, whereas orthogonal collocation on finite elements was used for temporal discretization. The proposed simultaneous scheduling and control formulation is tested using three multiproduct continuous tubular reactors featuring complex nonlinear behavior. © 2011 American Chemical Society.

Adams R.H.,The World Bank | Cuecuecha A.,Ibero-American University of Mexico
World Development | Year: 2010

This paper uses a nationally-representative household data set from Guatemala to analyze how the receipt of internal remittances (from Guatemala) and international remittances (from United States) affects the marginal spending behavior of households. Two findings emerge. First, controlling for selection and endogeneity, households receiving international remittances spend less at the margin on one key consumption good-food-compared to what they would have spent on this good without remittances. Second, households receiving either internal or international remittances spend more at the margin on two investment goods-education and housing-compared to what they would have spent on these goods without remittances. These findings support the growing view that remittances can help increase the level of investment in human and physical capital in remittance-receiving countries. © 2010 Elsevier Ltd.

Hernandez-Martinez E.G.,Ibero-American University of Mexico | Aranda-Bricaire E.,CINVESTAV
Studies in Informatics and Control | Year: 2012

Formation control is an important issue of motion coordination of Multi-agent Robots Systems. The goal is to coordinate a group of agents to achieve a desired formation pattern. The control strategies are decentralized because every robot does not possess information about the positions and goals of all the other robots. Based on the formation graphs properties and the local potential functions approach, we obtain a formal result about global convergence to the desired pattern for any formation graph. Also, we characterize the topologies of the formation graphs where the centroid of positions remains stationary. Finally, the control approach is extended to the case of unicycle-type robots.

Palma-Flores O.,Ibero-American University of Mexico | Flores-Tlacuahuac A.,Ibero-American University of Mexico | Canseco-Melchor G.,Ibero-American University of Mexico
Computers and Chemical Engineering | Year: 2015

The practical development of sustainable energy sources is presently one of the key research topics due to its strong social and economic impact. Among the sources of sustainable energy, the use of low-temperature energy reservoirs has attracted interest. Normally, because of their low energy content, those processing streams are considered as non-profitable, especially when water is used as the working fluid in the thermodynamic cycles used for energy recovery from low-temperature energy sources. However, the efficiency of energy recovery can be increased using working fluids featuring low-temperature boiling points under the proper processing conditions. In this work we propose the optimal molecular design of a new family of organic fluids whose aim is to increase energy recovery from low-temperature energy sources. The design problem is cast as a mixed-integer non-linear programming problem, where binary variables are used to define the molecular structure of the working fluids and continuous variables permit the computation of physical and thermodynamic properties. The results indicate that optimal molecular design techniques permit the design of new organic compounds which increase energy recovery. Moreover, the toxicity of the new working fluids was reduced in comparison to other organic fluids used for the same purpose. © 2014 .

Zavala V.M.,Argonne National Laboratory | Flores-Tlacuahuac A.,Ibero-American University of Mexico
Automatica | Year: 2012

We propose a utopia-tracking strategy to handle multiple conflicting objectives in model predictive control. The controller minimizes the distance of its vector of objectives to that of the compromise solution: the point along the steady-state Pareto front closest to the utopia point, where all the objectives are independently minimized. We establish conditions for asymptotic stability and propose numerical implementation variants. One of the key advantages of the approach is that it avoids the computation of Pareto fronts in real-time environments. In addition, the approach can handle general objectives of different nature such as economic and regularization. © 2012 Elsevier Ltd. All rights reserved.

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