Ricardo Torres Gaitán. Maestro emérito de la UNAM

Especialista en múltiples terrenos, el maestro Ricardo Torres Gaitán destaca como un conocedor profundo de las finanzas, el comercio internacional y el sector agropecuario. Preocupado por la crisis que agobia la economía nacional, desarrolla un importante análisis sobre la inflación que golpea a las grandes mayorías, definiendo con la claridad y lucidez características en el, su posición respecto a las causas de la inflación en México. Considera que la urgencia de atacar y resolver los problemas de la inflación y el desempleo deben iniciarse mediante la puesta en marcha de nuevas estrategias de desarrollo redistributivas del ingreso que impulsen una reactivación decidida del sector primario y de la pequeña y mediana industria

Aos olhos de Santa Lucía: arte urbana e organização comunitária no centro histórico de San Salvador

A arte urbana tem sido e continua a ser uma componente transformadora nos processos de renovação urbana, por meio do fortalecimento da memória, da recuperação do sentido do lugar e da redução da estigmatização. Este artigo analisa em profundidade o papel da arte urbana nos processos de requalificação (físico-espacial) e ressignificação (simbólica) em favelas urbanas, avaliando como estes processos estão relacionados com o reforço do apego ao lugar, o sentido de pertencimento, o sentido de segurança e a organização comunitária, e buscando refletir sobre como estes processos podem influenciar questões mais profundas, tais como o risco social e ambiental. A metodologia utilizada é a investigação de ação participativa, desenvolvida em conjunto com a Comunidade de Santa Lucía, no Centro Histórico de San Salvador. Embora as limitações da arte urbana sejam claras face a problemas complexos como a violência urbana e o risco ambiental, o caso de Santa Lucía reflete o potencial destas intervenções quando emergem como uma expressão coletiva e consensual, tornando-se um instrumento de reivindicação do cidadão, reforçando os laços e a organização da comunidade.El arte urbano ha sido y sigue siendo un componente transformador dentro de los procesos de renovación urbana, a través del fortalecimiento de la memoria, la recuperación del sentido del lugar y la reducción de la estigmatización. El presente artículo ahonda en el rol del arte urbano dentro de los procesos de recualificación (física-espacial) y resignificación (simbólica), analizando cómo se relacionan estos procesos con el fortalecimiento del apego del lugar, el sentido de pertenencia, el sentido de seguridad y la organización comunitaria, y apuntando a reflexionar en cómo estos procesos pueden incidir en problemáticas más profundas como el riesgo social y ambiental en Asentamientos Populares Urbanos. En términos metodológicos, se trata de una investigación-acción participativa, desarrollada junto a la Comunidad Santa Lucía en el Centro Histórico de San Salvador. Si bien las limitantes del arte urbano son claras de cara a problemáticas complejas como la violencia urbana y el riesgo ambiental, el caso de Santa Lucía refleja el potencial de estas intervenciones cuando surgen como una expresión colectiva y consensuada, llegando a convertirse en un instrumento de reivindicación ciudadana y fortaleciendo los lazos y la organización comunitaria.Urban art has been and continues to be a transforming component within urban renewal processes, reinforcing memory, recovering the sense of place, and reducing stigmatization. This article delves into the role of urban art within the (physical-spatial) requalification and (symbolic) resignification processes in Urban Working-Class Settlements, analyzing how these processes are related to strengthening place attachment, sense of belonging, sense of security, and community organization, and trying to reflect on how they can affect deeper lying issues such as social and environmental risk. The methodology used is participatory action research, which was developed with the Santa Lucía Community in the Historic Center of San Salvador. Although the limitations of urban art are clear in the face of complex problems such as urban violence and environmental risk, the case of Santa Lucía reflects the potential of these interventions when they emerge as a collective and consensual expression, becoming an instrument of citizen vindication, strengthening community ties and organization

A detailed look at the Szczarba map

We explain how to derive an explicit formula for a natural transformation relating the (left adjoints of) the homotopy coherent nerve and the Dwyer-Kan simplicial classifying space functor. The formula is derived using a method introduced by Szczarba when comparing two different chain models of a fibration. This note may be taken as a companion to section 3 of our previous article "Categorical models for path spaces"

«Burla burlando, van los dos delante»: distanciamiento declarado y acercamientos inconfesos de Jorge Luis Borges con san Juan de la Cruz

Estudio de la visión particular de Jorge Luis Borges sobre la mística y algunas congruencias con san Juan de la Cruz, en especial el fenómeno extraordinario al margen de la tradición religiosa hispánica

La Andalucía de Ávila : (impresiones recogidas en... Arenas de San Pedro)

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-201

Diagnostic system failure functional fuel cells through virtual instrumentation and signal processing

Emilio Contreras, Universidad APEC, República Dominicana; Yrvin Rivera, Universidad APEC, República Dominicana; Alvin Rodríguez, Universidad APEC, República Dominicana.Este proyecto de investigación se fundamenta en las Celdas de Combustibles (CC) de membrana de intercambio protónico (PEM), como elemento de producción de energía renovable limpia. En este trabajo de investigación se espera desarrollar algoritmos y técnicas que permitan hacer diagnósticos sobre los fallos que presentan en su funcionamiento las celdas, los cuales no son predecibles. Se plantea que, mediante el uso de software y hardware, se puede caracterizar y generar un modelo capaz de simular el comportamiento electroquímico de la celda de combustible. Para lograr estos objetivos formulados se instalará una celda de 4.5 kW en un área dedicada exclusivamente para estudiar el comportamiento bajo condiciones controlables de los parámetros de funcionamiento de la celda. Los resultados de las pruebas serán capturados utilizando instrumentación virtual y registrada en una base de datos integrada a un sistema computacional, los cuales servirán para diseñar y validar el modelo que define la celda. Como estrategia metodología esta investigación se divide en tres etapas; de las cuales, este trabajo aborda las dos primeras etapas con sus resultados y se plantea la tercera como una expansión futura. Los resultados esperados son: la creación de un Centro de energía renovable localizado en el Campus de Ingeniería de la Universidad APEC, la instalación de la celda de combustible instalada y el diseño de la instrumentación virtual para la captura de información que permitan validar los hallazgos de los estudios sobre las fallas funcionales de la celda PEM. // Abstract: This research project is based on fuel cells (FC) of proton exchange membrane (PEM), as an element of production of clean renewable energy. In this research is expected to develop algorithms and techniques to make diagnoses on the failures that occur in the cells operation, which are not predictable. It is stated that by using software and hardware, can be characterized and generate a model that can simulate the electrochemical behavior of the fuel cell. To achieve these objectives formulated a cell of 4.5 kw will be installed on a dedicated exclusively to study the behavior under controlled conditions of the operating parameters of the cell area. The test results will be captured using virtual instrumentation and recorded in a database integrated with a computer system which will be used to design and validate the model that defines the cell. As a strategy this research methodology is divided into three stages, this paper addresses the first two stages with their results and the third is planned as a future expansion. Expected results at this stage are: the establishment of a Renewable Energy Center located on the campus of Engineering at the University APEC, the installation of the fuel cell, the design and installation of virtual instrumentation to capture information to validate the findings of studies on the functional failures of the PEM cell.Universidad APEC (UNAPEC)

Lexical Derivation of the PINT Taxonomy of Goals: Prominence, Inclusiveness, Negativity Prevention, and Tradition

What do people want? Few questions are more fundamental to psychological science than this. Yet, existing taxonomies disagree on both the number and content of goals. We thus adopted a lexical approach and investigated the structure of goal-relevant words from the natural English lexicon. Through an intensive rating process, 1,060 goal-relevant English words were first located. In Studies 1-2, two relatively large and diverse samples (total n = 1,026) rated their commitment to approaching or avoiding these goals. Principal component analyses yielded 4 replicable components: Prominence, Inclusiveness, Negativity prevention, and Tradition (the PINT Taxonomy). Study 3-7 (total n = 1,396) supported the 4-factor structure of an abbreviated scale and found systematic differences in their relationships with past goal-content measures, the Big 5 traits, affect, and need satisfaction. This investigation thus provides a data-driven taxonomy of higher-order goal-content and opens up a wide variety of fascinating lines for future research

Comportement en flexion-compression des poteaux en béton ordinaire renforcés avec fibres synthétiques de polypropylène/polyéthylène

The goal of this research project is to analyze the behavior of columns made with plain concrete and synthetic polypropylene/polyethylene fiber addition. In order to supplement the current data base, an experimental study was carried out on six columns of real size and ordinary concrete resistance confined by circular stirrups and subjected to constant axial loads and cyclic flexure. Three columns were built with concrete of normal resistance with 0% of synthetic fibers and three columns were built of concrete with 1% by volume of synthetic fibers.The used concrete strength varied from 25 to 42 MPa, the resistance of longitudinal steel was 510 MPa, that of the stirrups of 468 and 510 MPa and the axial factor load around 25% Ag f'c . Today, it is possible to explore the behavior in the plastic range of the structural elements under seismic loading. Predictions of behaviour of moment vs curvature as well as predictions of force vs displacement relationship were accomplished. Indeed, the comparison between the experimental results and the prediction made for the specimens with and without fibers shows a very good agreement. In the case of the prediction of the moment vs curvature relationship, the MNPHi software developed by [PAULTRE, 1996] was used and in the case of the prediction of force vs displacement relationship, software DISP96 developed by [LÉGERON, 1998] was used. Finally, the influence of tie spacement as well as addition of fibers were clearly observed.The results show that the presence of polypropylene/polyethylene fibers in the concrete matrix improves ductility, tenacity, and the capacity to dissipate energy. Also, they help to retain the cover concrete

On the Challenges of Implementing Machine Learning Systems in Industry

RÉSUMÉ : Dans l’optique de ce mémoire, nous nous concentrons sur les défis de l’implantation de sys-tèmes d’apprentissage automatique dans le contexte de l’industrie. Notre travail est réparti sur deux volets: dans un premier temps, nous explorons des considérations fondamentales sur le processus d’ingénierie de systèmes d’apprentissage automatique et dans un second temps, nous explorons l’aspect pratique de l’ingénierie de tels systèmes dans un cadre industriel. Pour le premier volet, nous explorons un des défis récemment mis en évidence par la com-munauté scientifique: la reproducibilité. Nous expliquons les défis qui s’y rattachent et, à la lueur de cette nouvelle compréhension, nous explorons un des effets rattachés, omniprésent dans l’ingénierie logicielle: la présence de défaut logiciels. À l’aide d’une méthodologie rigoureuse nous cherchons à savoir si la présence de défauts logiciels, parmis un échantillon de taille fixe, dans un cadriciel d’apprentissage automatique impacte le résultat d’un processus d’apprentissage.----------ABSTRACT : Software engineering projects face a number of challenges, ranging from managing their life-cycle to ensuring proper testing methodologies, dealing with defects, building, deploying, among others. As machine learning is becoming more prominent, introducing machine learn-ing in new environments requires skills and considerations from software engineering, machine learning and computer engineering, while also sharing their challenges from these disciplines. As democratization of machine learning has increased by the presence of open-source projects led by both academia and industry, industry practitioners and researchers share one thing in common: the tools they use. In machine learning, tools are represented by libraries and frameworks used as software for the various steps necessary in a machine learning project. In this work, we investigate the challenges in implementing machine learning systems in the industry