POLÍTICAS PÚBLICAS PARA UNA POBLACIÓN VULNERABLE: EVALUACIÓN DEL PLAN “VUELVO A ESTUDIAR” EN ROSARIO, ARGENTINA

The aim of this research is to analyze and asses the implementation of the program called “Vuelvo a Estudiar”, managed by the government of the province of Santa Fe, at La Tablada. The above mention program is a comprehensive socio-educational policy, a drop-out recovery program developed, as a priority, in impoverished neighborhoods. It is also presented as policy instrument craftily developed and increasingly implemented according to the persons responsible for the field work and a network structure approach. The analysis is based on the policy network approach. It starts locally, taking into consideration the players, their relationship at field work, their instruments and backgrounds, as well as the interrelationship or tensions between their rationalities during the hands-on work.El presente trabajo de investigación propone un análisis y evaluación de la implementación del Plan “Vuelvo a Estudiar” de la provincia de Santa Fe en el Barrio La Tablada. El mismo, se presenta como una política socioeducativa inclusiva que pretende reinsertar escolarmente a jóvenes que hayan abandonado la escuela secundaria, circunscribiéndose en barrios vulnerables considerados como prioritarios. Asimismo, se plantea como un instrumento de política desarrollado artesanalmente e implementado de manera incremental de acuerdo a los responsables territoriales, y bajo una estructura en red. Para analizarlo, desarrollamos un estudio a partir del enfoque de policy network o gestión en redes partiendo desde lo local considerando a los diferentes actores, las relaciones entre los mismos en el territorio, sus instrumentos y saberes en juego como las racionalidades que se interrelacionan y/o tensionan en el momento de la puesta en práctica

Determinación de propiedades mecánicas en materiales laminares a partir de un ensayo vibroacústico

Una de las limitaciones que nos encontramos al trabajar con materiales laminares (tipo film) es la correcta determinación de sus propiedades mecánicas. Los ensayos experimentales usuales como el de tracción no son siempre adecuados para evaluarlas, existiendo casos donde el propio procedimiento del ensayo afecta a la validez de los resultados. En este trabajo se propone una metodología no destructiva para caracterizar estos materiales a partir de ensayos vibro-acústicos. En general una membrana de un material dado responde a una excitación acústica (presión sonora) vibrando en un rango de pequeñas deformaciones. La vibración de la membrana es función de sus características dinámicas, a nivel de frecuencias y de modos de vibración propios. Esta respuesta, controlada la excitación a la que se somete la membrana, es medible, y por tanto puede ayudarnos a inferir sus características mecánicas. Sin embargo, esto no es inmediato. La interacción entre las ondas sonoras y la respuesta de la membrana (acoplamiento mecánico-acústico) es compleja y requiere un estudio cuidadoso, ya que puede verse afectada por multitud de factores como las fuentes de sonido, los puntos de toma de medida o las magnitudes de las mismas, entre otros. En este artículo se desarrolla una propuesta de ensayo experimental en la cual, analizados estos factores, nos permite dar respuesta al problema y obtener las propiedades mecánicas con una precisión mayor que en la de los ensayos clásicos. Se presentan además algunos ensayos preliminares que justifican la propuesta de trabajo.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.TEP-6604 Junta de Andalucia

Diversas concepción en torno a la naturaleza como sujeto político: de la necesidad de cambio de paradigmas

The present paper relates perspectives around the discourse that about nature have been built, with special emphasis on the need to recognize it (nature) the category of subject, as opposed to the modern, industrial, post-industrial inheritance, which considers it to be a mere object, raw material, base input for the production system within the framework of the capitalist system.El presente texto relacionan perspectivas en torno al discurso que sobre la Naturaleza se han construido, haciendo especial énfasis en la necesidad de reconocerle (a la naturaleza) la categoría de sujeto, en oposición a la herencia moderna, industrial, post industrial, que la considera un mero objeto, materia prima, insumo base para el sistema de producción en el marco del sistema capitalista

Kinetic Study of Oxidative Dehydrogenation of Ethane over MoVTeNb Mixed-Oxide Catalyst

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial & Engineering Chemistry Research, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://doi.org/10.1021/ie402447h[EN] A MoVTeNb multimetallic mixed oxide was studied for the oxidative dehydrogenation of ethane, a promising alternative for catalytic ethylene production. Lab-scale steady-state experimental reaction data were obtained according to a 3(k) experimental design to investigate the simultaneous effect of temperature (400-480 degrees C) and space time [23-70 g(cat) h (mol of ethane) I]. A fixed-bed reactor at atmospheric pressure was employed, feeding a mixture of ethane, oxygen, and nitrogen. Ethane conversion varied from 17 to 85%, whereas selectivity for ethylene and COx varied from 94 to 76% and from 4.0 to 24%, respectively. These types of analyses are useful for determining the optimum reaction conditions to enhance the catalytic performance of the mixed oxides presented herein.This work was financially supported by the Instituto Mexicano del Petroleo. Technical support from Eng. G. Alonso-Ramirez is gratefully acknowledged.Valente, J.; Quintana-Solorzano, R.; Armendariz-Herrera, H.; Barragan-Rodriguez, G.; López Nieto, JM. (2014). Kinetic Study of Oxidative Dehydrogenation of Ethane over MoVTeNb Mixed-Oxide Catalyst. Industrial and Engineering Chemistry Research. 53(5):1775-1786. doi:10.1021/ie402447hS1775178653

Understanding the kinetic behavior of a Mo-V-Te-Nb mixed oxide in the oxydehydrogenation of ethane

Two kinetic models based on Langmuir-Hinshelwood (LH) and Eley-Rideal (ER) mechanisms were developed to describe the oxydehydrogenation of ethane to yield ethylene over a Mo-V-Te-Nb catalyst. Obtained in a lab-scale fixed-bed reactor, experimental data at the steady-state were used to estimate the kinetic models parameters via a nonisothermal regression. Experiments were performed using an ethane, oxygen and nitrogen mixture as feedstock, spanning temperatures from 673 to 753 K, inlet partial pressures of oxygen and ethane between 5.0 and 22.0 kPa, and space-time from 10 to 70 g(cat) h(molethane)- (1). Ethylene, CO and CO2 were the only detected products, the selectivity for ethylene ranged from 76% to 96% for an ethane conversion interval 4-85%. A series of tests feeding ethylene instead of ethane were also performed at 713 K, varying inlet partial pressures and space-time in the same ranges as was done for ethane. Ethylene conversion was relatively low, 3-14%, the dominant product being CO with CO/CO2 ratios from 0.73 to 0.79. The LH mechanism was found to represent better the experimental data. The oxydehydrogenation of ethane was the reaction with the lowest activation energy, 108-115 kJ mol (1). Except for the conversion of ethane into CO2, deep oxidations were detected as very energetically demanding steps, 156-193 kJ mol (1). Competitive adsorption between reagents and products occurred in the two mechanisms particularly at relatively high reaction severity, water re-adsorption being weaker in comparison with COx re-adsorption. (C) 2014 Elsevier Ltd. All rights reserved.This work was financially supported by the Instituto Mexicano del Petroleo.Quintana-Solorzano, R.; Barragan-Rodriguez, G.; Armendariz-Herrera, H.; López Nieto, JM.; Valente, JS. (2014). Understanding the kinetic behavior of a Mo-V-Te-Nb mixed oxide in the oxydehydrogenation of ethane. Fuel. 138:15-26. doi:10.1016/j.fuel.2014.07.051152613

Slag Substitution as a Cementing Material in Concrete: Mechanical, Physical and Environmental Properties

A circular economy is a current tenet that must be implemented in the field of construction. That would imply the study of the possibilities of the use of waste generated, for obtaining materials the used in construction as replacements for the raw material used. One of these possibilities is the substitution of the cement by slag, which contributes to the reduction of cement consumption, decreasing CO2 emissions, while solving a waste management problem. In the present paper, di erent types of concrete made by cement substitution with di erent type of slags have been studied in order to evaluate the properties of these materials. Cement is replaced by slag from di erent steel mills, both blast furnace and ladle furnace slag. The percentages of slag substitution by cement are 30%, 40% and 50% by weight. Mechanical, physical and environmental properties have been evaluated. Compressive and flexural strength have been analysed as the main mechanical properties. As far as physical properties go, density and porosity tests were be reported and analysed, and from an environmental point of view, a leachate study was performed. It has been found that some kinds of slag (blast furnace slag) are very suitable as substitutes for cement, providing properties above those of the reference concrete, while other types (ladle furnace slag) could be valid for non-structural applications, contributing in both cases to a circular econom

Comportamiento agronómico de poblaciones de maíz (Zea mays L.) que segregan al mutante poliembrionía

The maize polyembryony (PEm) is phenotypically expressed when the seed germinates in two or more seedlings simultaneously, which in turn develops the capacity to overcome the close competition among sisters and neighboring plants. Because of that, it is thought that the inclusion of PEm in some new maize varieties can be useful looking for high yields and corn grain quality as a response to the global food demand. This research is about the PEm inheritance, the inclusion, recovery of polyembryony in segregating populations, and exploring their performance capacity. The foundation populations were the progenies from crosses among polyembryonic sources and inbred lines, producing several F1 groups, and from each the proper F2, and G3 and G4 generations. The latter two were developed through successive positive assortative matings (AM+). G3 populations were used to generate diallel crossings, Griffing’s method 4, and part of them were evaluated in a performance assay, using a complete block design with a split-split plot arrangement. Results supported a validation of the inheritance model proposed for this sort of polyembryony, which states that the trait is controlled by two independent loci, under epistatic interaction of the type "duplicate gene action". Moreover, the arbitrarily handling of sexual reproduction in F2 plants and in G3 and G4 generations through positive assortative matings (AM+) increased the PEm frequency on an average up to 40 % in G4, departing from the 4.9 % in F2. Also, the performance assay shown a yield potential of the trait. The PEm mutant might be useful in maize production.La poliembrionía de maíz (PEm) se expresa fenotípicamente cuando la semilla germina en dos o más plántulas simultáneamente, lo que a su vez desarrolla la capacidad de superar la competencia cercana entre hermanas y plantas vecinas. Por eso, se cree que la inclusión de PEm en algunas variedades de maíz nuevas puede ser útil en busca de altos rendimientos y calidad de grano de maíz como respuesta a la demanda global de alimentos. Esta investigación trata sobre la herencia de PEm, la inclusión, la recuperación de la poliembrionía en poblaciones segregantes y la exploración de su capacidad de rendimiento. Las poblaciones de base fueron las progenies de cruzamientos entre fuentes poliembriónicas y líneas puras, produciendo varios grupos F1, F2, G3 y G4 apropiados. Los dos últimos se desarrollaron a través de apareamiento preferencial positivo (AM +). Las poblaciones G3 se utilizaron para generar cruzas dialélicas, método 4 de Griffing, y parte de ellas fueron evaluadas en un ensayo de rendimiento, utilizando un diseño de bloques completos al azar con arreglo en parcelas subdivididas. Los resultados respaldaron una validación del modelo de herencia propuesto para este tipo de poliembrionía, en el cual se establece que el rasgo está controlado por dos loci independientes, bajo una interacción epistática del tipo "acción genética duplicada". Además, el manejo arbitrario de la reproducción sexual en plantas F2 y en generaciones G3 y G4 mediante apareamiento preferencial positivo (AM +) aumentó la frecuencia de PEm en un promedio de hasta 40% en G4, partiendo del 4,9% en F2. Además, el ensayo de rendimiento mostró potencial en los rasgos relacionados con el rendimiento. El mutante PEm podría ser útil en la producción de maíz.Fil: Alcalá-Rico, Juan Samuel Guadalupe Jesús. Universidad Autónoma Agraria Antonio Narro (México)Fil: Espinoza-Velázquez, José. Universidad Autónoma Agraria Antonio Narro (México)Fil: López-Benítez, Alfonso. Colegio de Postgraduados. Campus Puebla (México)Fil: Borrego-Escalante, Fernando. Universidad Autónoma Agraria Antonio Narro (México)Fil: Rodriguez-Herrera, Raul. Universidad Autónoma de Coahuila (México)Fil: Hernández-Martínez, Rosendo. Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (México

Supervisión y monitoreo remoto basada en protocolos de enrutamiento de internet de un sistema de control continuo o discreto

Con la realización del proyecto se pretende desarrollar una interface mediante la cual un usuario pueda supervisar y monitorear un determinado proceso industrial tanto local como remotamente desde cualquier lugar con acceso a internet. Con esto ayudamos a cambiar la percepción que se tiene sobre un sistema de control industrial y vamos un poco más lejos de lo que normalmente encontramos en los procesos colombianos. Con miras a cumplir los objetivos planteados, se diseño una estructura de Software y Comunicación, abarcando cada punto a tener en cuenta durante la implementación de este tipo de proyectos, teniendo como producto final un paso a paso detallado del diseño realizado y de la configuración de todos los componentes utilizados, además de una serie de recomendaciones y soluciones a problemas encontrados que ayudarán al lector a implementar este tipo de sistemas de una forma práctica y sencilla.Ingeniero de Telecomunicacionespregrad

Aplicación de la NIC 17 en los contratos de arrendamiento financieros tratados como contratos de arrendamiento operativo de la empresa JMC S.A. en el distrito de San Isidro del periodo 2015

El presente trabajo, se basó en la Norma internacional de contabilidad NIC 17 Arrendamientos . La información materia de estudió, se realizó en la empresa JMC S.A. quien nos brindó acceso a su información contable del ejercicio 2015. La empresa al cierre de su ejercicio, contaba con 28 contratos clasificados y contabilizados como contratos de Arrendamientos Operativos. Para la determinación de su tratamiento contable, no consideró la esencia económica de la transacción en lugar de la forma legal del contrato. El tratamiento contable que utiliza la empresa, no está alineado bajo la NIC 17 arrendamientos, sus contratos cumplen con más de un indicar que determina que sus contratos son Arrendamientos Financieros. Los valores presentes de sus cuotas de alquiler superan el 90% del valor del activo, la vida económica de la maquina supera el 75% utilizada por sus clientes. La empresa viene presentando una información financiera con falta de transparencia y objetividad, la cual impacta en sus resultados y en la toma de decisiones, se le recomienda la adopción de la NIC 17 en su tratamiento contable, para valorar la real dimensión de la situación financiera de la empresa.Trabajo de suficiencia profesionalCampus Lima Centr

A food web approach reveals the vulnerability of biocontrol services by birds and bats to landscape modification at regional scale

Pest control services provided by naturally occurring species (the so-called biocontrol services) are widely recognized to provide key incentives for biodiversity conservation. This is particularly relevant for vertebrate-mediated biocontrol services as many vertebrate species are of conservation concern, with most of their decline associated to landscape modification for agricultural purposes. Yet, we still lack rigorous approaches evaluating landscape-level correlates of biocontrol potential by vertebrates over broad spatial extents to better inform land-use and management decisions. We performed a spatially-explicit interaction-based assessment of potential biocontrol services in Portugal, using 1853 pairwise trophic interactions between 78 flying vertebrate species (birds and bats) and 53 insect pests associated to two widespread and economically valuable crops in the Euro-Mediterranean region, olive groves (Olea europaea subsp. europaea) and vineyards (Vitis vinifera subsp. vinifera). The study area was framed using 1004 square cells, each 10 × 10 km in size. Potential biocontrol services were determined at all those 10 × 10 km grid-cells in which each crop was present as the proportion of the realized out of all potential pairwise interactions between vertebrates and pests. Landscape correlates of biocontrol potential were also explored. Our work suggests that both birds and bats can effectively provide biocontrol services in olive groves and vineyards as they prey many insect pest species associated to both crops. Moreover, it demonstrates that these potential services are impacted by landscape-scale features and that this impact is consistent when evaluated over broad spatial extents. Thus, biocontrol potential by vertebrates significantly increases with increasing amount of natural area, while decreases with increasing area devoted to target crops, particularly olive groves. Overall, our study highlights the suitability of our interaction-based approach to perform spatially-explicit assessments of potential biocontrol services by vertebrates at local spatial scales and suggest its utility for integrating biodiversity and ecosystem services in conservation planning over broad spatial extents.This work was supported by the projects ECOLIVES (PTDC/AAG-REC/6480/2014) and OLEAdapt (PTDC/ BIA-CBI/1365/2020) both funded by the Portuguese National Public Agency for Science, Technology and Innovation, and the project SHOWCASE (ref. 862480) funded by the Horizon 2020 Research and Innovation programme from the European Union. and the project NORTE 01-0246-FEDER-000063, funded by Norte Portugal Regional Operational Programme (NORTE2020),under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) JMH and FM were supported, respectively, by the contracts IF/00001/2015 and IF/01053/2015 funded by the FCT. JRP was supported by ‘la Caixa’ and ‘Caja Navarra’ Foundations, under agreement LCF/PR/PR13/51080004 in the framework of UPNA’s ‘Captación de Talento’ program. BS, GJ-N, SV and RM were supported, respectively, by the PhD studentships SFRH/BD/137803/2018, SFRH/BD/133017/2017, SFRH/BD/121388/2016 and SFRH/BD/99746/2014 funded by the FCT