Industrial Fieldbus Improvements in Power Distribution and Conducted Noise Immunity With No Extra Costs

Industrial distributed control continues the move toward networks at all levels. At lower levels, control networks provide flexibility, reliability, and low cost, although perhaps the simplest but most important advantage is the reduced volume of wiring. Powered fieldbuses offer particular notable benefits in system wiring simplification. Nevertheless, very few papers are dealing with the potentials and limitations in power distribution through the bus cable. Only a few of the existent fieldbus standards consider this possibility but often simply as an option without enough technical specifications. In fact, nobody talks about it, but power distribution through the bus and conducted noise disturbances are strongly related. This paper points out and analyzes these limitations and proposes a new low-cost fieldbus physical layer that enlarges power distribution capability of the bus and improves system robustness. We show an industrial application on water desalination plants and the very good results obtained owing to the fieldbus. Finally, we present electromagnetic compatibility test results that verify improvements against electrical fast transients on the sensor/actuator connection side as disturbances usually encountered in harsh-environment industrial applications

Propuesta de Problemas: Una Actividad Matemática Creativa

Desde la enseñanza básica los estudiantes presentan dificultades al resolver problemas, ésta situación ha sido estudiada desde múltiples enfoques y diferentes niveles, pero las investigaciones concuerdan en el que los actores del proceso educativo deben implementar estrategias que aminoren dichos inconvenientes. Estudios recientes y relevantes mostraron la importancia del planteamiento de problemas para el desarrollo de la creatividad matemática, indican también que los problemas planteados pueden ofrecer una variedad de contextos para estudiar y desarrollar habilidades matemáticas. En base a lo anterior y debido a que en la asignatura de Precálculo, se plantean problemas de aplicación con la finalidad de guiar a los estudiantes para que propongan problemas y con ello se motiven a resolverlos, desarrollen su creatividad e implementen los aprendizajes aprendidos en los cursos. Since basic education students are facing difficulties in solving problems, this study was carried out based on multiple approaches and at different levels. Research supports the view that the actors in the educational process should implement strategies to alleviate the problem faced by basic education students. Recent and relevant studies showed the importance of posing problems for the development of mathematical creativity. They also indicate that the problems posed can offer a variety of contexts to study and develop mathematical skills. Based on the above and in the subject of Precalculus, problems of application have risen up so as to guide students on how to solve problems. Student’s ability to solve problems would make them feel motivated, develop their creativity, and help them apply the lessons learned in the courses

Returns to education in Argentina: a regional analysis

The study of regional differences in Argentina in terms of returns to education is highly relevant, primarily due to the existence of deep inequalities in the configuration of regional structures in this country. The main differences are based on several economic and demographic characteristics across regions that have an impact on the social dynamics of such regions.This issue has been acknowledged in the literature, in order to get a full understanding of the dynamics that might explain those dissimilarities, especially in the educational and labour fields. However, empirical literature or the case of Argentina is still limited.The analysis of regional differences in human capital, as well as their impact on private returns to education - i.e. income levels of individuals - has been addressed in a number of studies, such as Winters (2012), Lopez-Bazo and Motellón (2012), and Ciccone et al. (2004), for the cases of the United States, Spain, and Italy, respectively. For the Argentinean case, no attention has been paid to differences in the returns to education by region. Only a few recent studies, such as Giovagnoli et al. (2005), have approached this issue by using Mincerian equations as the methodological strategy to estimate the returns to education, combined with a quantile regression analysis to detect differences in the returns across the distribution of wages. However, the regional perspective was not incorporated in this study, even when wage differences between regions are remarkable.On the other hand López Bóo (2010) quantify the returns to education in Argentina according different macroeconomic shocks from 1992 to 2003 but not including the regional perspective neither.Several literature across the Latin-American countries quantifies the rates of the returns to education using - most of them - quintile regression or time series, such as: Psacharopoulos & Velez (1992) who estimate the returns of education in Colombia for a ten years period; López-Acevedo (2004) that analyse the contribution of educational inequality as a key variable for understanding earnings inequality in Mexico and Patrinos & Sakellariou (2010) who study the relation between the returns to education and the effect of the swings in economic activity on the demand and supply of education and skills in Venezuela for the period 1992 to 2002. Nevertheless none of them use the regional perspective in their analysis, even when the different levels of returns to education can be explained through regional characteristics as a determinant of those differences.It is surprising that being this issue greatly relevant in order to understand the heterogeneity among geographic regions in Argentina, no previous studies have considered the role played by human capital in order to explain the substantive regional differences within the national labour market. This paper seeks to contribute to the study of regional labour markets in terms of their returns to education in Argentina. For that aim we firstly quantify the returns to education for every region using a typical Mincerian equation and then analyse the wage gap through the Oaxaca-Blinder decomposition.The paper is organized in five sections, as follow: the next one describe the regional structure in Argentina, as well as the main characteristics of the labour market and the endowment of human capital. Then we explain the methodological strategy so as to estimate the empirical wage model in the second section. A description and summary of the data set is briefly presented in third section. Before that we present the results for different specifications of the model by region in section fourth. Finally, in the last section the conclusions and future extensions.https://rdu.unc.edu.ar/handle/11086/4528Fil: Quiroga Martínez, Facundo. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas; Argentina.Fil: Fernández-Vázquez, Esteban. Universidad de Oviedo. Department of Applied Economics; España.Fil: Alberto, Catalina Lucía. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas; Argentina.Matemática Aplicad

Las Representaciones Sociales De Profesores Acerca Del Aprendizaje De La Matemática: El Caso De Profesores Inmigrantes

Esta investigación aborda las representaciones sociales (RS), ideas y percepciones que tienen dos profesores de matemáticas, uno originario de Europa Oriental, y otro de un país caribeño, acerca del aprendizaje de la matemática, a partir de sus experiencias didácticas con sus estudiantes de las licenciaturas a quienes han impartido clases de manera presencial en una universidad pública en México. Para la recolección de información se empleó como instrumento un cuestionario abierto. Se establecieron diez dimensiones que consideran las preguntas del cuestionario como elementos de observación y recopilación para los propósitos de la investigación; además se establecieron las categorías de cada dimensión, las cuales son las respuestas, las RS que cada profesor tuvo sobre las preguntas. En particular se presentan los resultados de las respuestas que los profesores han manifestado y ambos coinciden que ha sido grato trabajar en México y consideran que ha sido importante su aportación para la educación, sin embargo consideran que la formación en matemática debe ser más rigurosa y los estudiantes deben dedicar más tiempo a su estudio. La idea de conocer las opiniones de los profesores pretende que en alguna investigación futura se puedan comparar sus opiniones con las de profesores de México y el impacto que han tenido en los estudiantes. This paper focuses on addressing the Social Representations (SR), ideas, and perceptions that two math teachers, one from Eastern Europe and one from a Caribbean country, have about learning mathematics. The study was carried out based on their teaching experiences with their students to the degree of those who have taught in person at a public university in Mexico. For the collection of information, an open questionnaire was used as an instrument. Ten dimensions were established that considered the questions of the questionnaire as elements of observation and compilation for the specifics of the investigation; In addition, the categories of each dimension were established, which are the answers, the SR that each teacher had on the questions. In particular, the results of the answers that the professors have expressed and both agree that it has been pleasant to work in Mexico and consider that their contribution to education has been important, however they consider that mathematics training should be more rigorous and students should devote more time to their study. The idea of knowing the opinions of the professors intends that in some future research their opinions can be compared with those professors in Mexico and the impact they have had on student

Derecho del trabajo

2ª ed.[Resumen] Este manual universitario de Derecho del Trabajo expone, con toda claridad pero también con todo rigor académico, lo que normalmente suele integrar el contenido de hasta cuatro manuales distintos: la introducción al Derecho del Trabajo (con su historia), el Derecho del contrato de trabajo, el Derecho sindical y el Derecho procesal del Trabajo.Su cuidada tipografía, con tres niveles de conocimiento distintos marcados por tres tamaños distintos de letra, se ha ideado con la finalidad de separar en el texto lo que el alumno universitario realmente debe conocer y estudiar, desgajando de este nivel de conocimiento otros temas que interesan más inmediantamente al profesorado en formación, a los profesionales del laboralismo (jueces, abogados y graduados sociales), a los sindicalistas. Esta segmentación de niveles de conocimiento lo convierte en una herramienta docente útil no sólo en las Facultades de Derecho, sino también en otros centros universitarios distintos (Escuelas Universitarias de Relaciones Laborales, Escuelas Universitarias de Estudios Empresariales, Facultades de Administración y Dirección de Empresas, etc.) en los que también se imparte Derecho del Trabajo

Derecho de la Seguridad Social

[Resumen] Este manual universitario completamente actualizado y puesto al dia, pues incorpora todas las recientes reformas habidas hasta la promulgacion de la Ley 40/2007, incluida esta expone con toda claridad el conjunto de las instituciones que conforman el Derecho español de la Seguridad Social, habiendo sido concebido para poder ser explicado con absoluto rigor academico, incluso sin rebasar el espacio temporal de un trimestre, en el curso academico correspondiente. Su cuidada tipografia, con tres niveles de conocimiento distintos marcados por tres tamaños distintos de letra, pretende separar en el texto lo que el alumno universitario realmente debe conocer y estudiar, desgajando de este nivel de conocimiento primordial otros temas que interesan mas inmediatamente al profesorado en formacion o a los profesionales implicados en la llevanza de asuntos juridicos de Seguridad Social (jueces, abogados, graduados sociales, etc.). Esta segmentacion de niveles de conocimiento lo convierte en una herramienta docente util no solo en las Facultades de Derecho, sino tambien en otros centros universitarios distintos (Escuelas Universitarias de Relaciones Laborales, Escuelas Universitarias de Estudios Empresariales, Facultades de Administracion y Direccion de Empresas, etc.) en los que tambien se imparte Derecho de la Seguridad Social

Biotecnología

El ejercicio profesional del Médico Veterinario Zootecnista esta relacionado con muchos procesos biotecnológicos. La biotecnología en su definición más amplia, incluye la idea del uso de organismos biológicos con la finalidad de facilitar o mejorar la obtención de productos derivados de ellos, podríamos decir que ésta ha acompañado al hombre desde los inicios de la civilización y que ha alcanzado a diversas áreas de interés humano como son los alimentos, la medicina, procesos industriales, la agricultura y la medicina veterinaria y la zootecnia. Por lo que el presente curso pretende dar al alumno un panorama generadle algunos de los aspectos más relevantes de la biotecnología que tienen un impacto en el área del conocimiento profesional de un médico Veterinario Zootecnista, con un enfoque teórico práctico en algunas áreas, y teórico en otras; tales como la ingeniería genética, Proteómica, inmunología, la reproducción y producción animal y diagnóstico de enfermedades infecciosas y genéticas. Así como, los aspectos bioéticos esenciales en la manipulación y manejo sanitario de los animales de laboratorio

VANEDELA’s Test Screening, Comparison Low, Middle, and High Risk in Mexican Population

The neurodevelopment screening test Valoración Neuroconductual del Lactante (VANEDELA’s) allows the professional to follow the rapid and economic application development in which high- and moderate-risk children who do not reach their optimum development potential during the first 2 years of life can be detected in a timely manner. It also provides a tracking tool to follow-up the recommendations and interventions of children who had developmental delays to see how adaptive strategies work

Production of pectinases by <i>A. niger</i>: Influence of fermentation conditions

Response surface methodology was used for optimization of polygalacturonase (PG) and pectinesterase (PE) production in submerged fermentation by A.niger. A Central Composite Experimental Design was applied, consisting of 22 experiments, including eight central points. Variables studied were: fermentation time (24 to 120 h), pH (3.5 to 6.5) and initial concentration of pectin (5 to 20 g/l). Maximum PE production was 220 U/l, after 74 h of culture, in a medium containing 20 g/l of pectin (pH 6.5). The optimal conditions for PG production were pH: 4.1, 20 g/l of pectin and 94 h of fermentation with a maximum value of 1032 U/l. Under these conditions, the PE production was low (15 U/l). A liquid extract with high PG activity and low PE activity could be suitable to be used in food processing in order to reduce the production of methanol.Facultad de Ciencias Exacta

On-site forest fire smoke detection by low-power autonomous vision sensor

Early detection plays a crucial role to prevent forest fires from spreading. Wireless vision sensor networks deployed throughout high-risk areas can perform fine-grained surveillance and thereby very early detection and precise location of forest fires. One of the fundamental requirements that need to be met at the network nodes is reliable low-power on-site image processing. It greatly simplifies the communication infrastructure of the network as only alarm signals instead of complete images are transmitted, anticipating thus a very competitive cost. As a first approximation to fulfill such a requirement, this paper reports the results achieved from field tests carried out in collaboration with the Andalusian Fire-Fighting Service (INFOCA). Two controlled burns of forest debris were realized (www.youtube.com/user/vmoteProject). Smoke was successfully detected on-site by the EyeRISTM v1.2, a general-purpose autonomous vision system, built by AnaFocus Ltd., in which a vision algorithm was programmed. No false alarm was triggered despite the significant motion other than smoke present in the scene. Finally, as a further step, we describe the preliminary laboratory results obtained from a prototype vision chip which implements, at very low energy cost, some image processing primitives oriented to environmental monitoring.Ministerio de Ciencia e Innovación 2006-TIC-2352, TEC2009-1181