Search results for "lcsh:T"
showing 10 items of 2832 documents
Mexican journals of educational research towards mainstream dissemination of science
2014
The purpose of this study is to analyze the Electronic Journal of Educational Research (REDIE) on its path towards the common manner of scientific dissemination. This research presents the evolution of Mexican policy with regards to the journals, the situation of the Educational Research Mexican journals, and its profundity relating to REDIE. In its evolution, there were three moments that stood out the most: the standardization of quality criteria, the digitalization and open access of the scientific journals, those that came together with REDIE like REDALYC and LATINDEX , and the individual initiatives of those journals that motivated the development of the scientific dissemination in Mex…
Historia desde el cine [y con la literatura] para la educación
2012
Vivimos en un mundo en el que las imágenes conforman las distintas memorias de nuestro tiempo. El historiador, en su tarea docente, acepta esa preponderancia de las imágenes y las integra en su tarea profesional mediante el uso de lo que denominamos documentos en soporte de vídeo (DSV). Además, el docente puede (y debe) incorporar otro tipo de fuente como es la literatura, para hacer más accesible el conocimiento histórico. Por cuanto respecta al trabajo con los DSV, establecemos tres categorías entre ellos, y proponemos un abordaje en cuatro etapas: identificación, contextualización, disección y análisis. Entendemos que el trabajo con los DSV nos permite un doble plano formativo: el desarr…
MOOCEP: Un método para construir cursos masivos para Adultos Mayores: Usando una creación MOOCEP
2018
Hoy en día, la población de adultos mayores se ha incrementado significativamente en relación al total de la población mundial, así también este segmento en los últimos años ha mostrado una mayor adherencia e interés a los avances tecnológicos, entre ellos el Internet y sus servicios con la finalidad de desarrollar diferentes actividades tales como entretenimiento, información de actualidad, aprendizaje de diferentes tópicos, entre otros. Sin embargo, las aplicaciones y sitios web no tienen en cuenta los requisitos específicos de las personas de la tercera edad. De ahí, es necesario contar con metodologías, procesos y herramientas, las mismas que tengan en cuenta formas apropiadas de intera…
On the Substitutability between Paid-employment and Self-employment: Evidence from the Period 1969–2014 in the United States
2019
This paper provides estimates of the elasticity of substitution between operational and managerial jobs in the US economy during the years 1969–2014, derived from an aggregate CES production function. Estimating the long-term relationship between (the log of) the aggregate employment/self-employment ratio and (the log of) the returns from paid-employment relative to self-employment and testing for structural breaks, we report different estimates of the elasticity of substitution in each of the two regimes identified. To this end we apply the methodology on instability tests proposed in Kejriwal and Perron (2008, 2010) as well as the cointegration tests developed in Arai and Kurozumi (2007) …
Application of Electronic Nose for Evaluation of Wastewater Treatment Process Effects at Full-Scale WWTP
2019
This paper presents the results of studies aiming at the assessment and classification of wastewater using an electronic nose. During the experiment, an attempt was made to classify the medium based on an analysis of signals from a gas sensor array, the intensity of which depended on the levels of volatile compounds in the headspace gas mixture above the wastewater table. The research involved samples collected from the mechanical and biological treatment devices of a full-scale wastewater treatment plant (WWTP), as well as wastewater analysis. The measurements were carried out with a metal-oxide-semiconductor (MOS) gas sensor array, when coupled with a computing unit (e.g., a computer with…
Instrumental Odour Monitoring System Classification Performance Optimization by Analysis of Different Pattern-Recognition and Feature Extraction Tech…
2020
Instrumental odour monitoring systems (IOMS) are intelligent electronic sensing tools for which the primary application is the generation of odour metrics that are indicators of odour as perceived by human observers. The quality of the odour sensor signal, the mathematical treatment of the acquired data, and the validation of the correlation of the odour metric are key topics to control in order to ensure a robust and reliable measurement. The research presents and discusses the use of different pattern recognition and feature extraction techniques in the elaboration and effectiveness of the odour classification monitoring model (OCMM). The effect of the rise, intermediate, and peak period …
Influence of Polymer Electrospun Nanofibers on Thermal Properties of Epoxy Resins
2019
Electrospinning of polymers has gained surging interest in the last decades due to its wide range of applications in different fields, such as sensors, electronic devices, separation systems, biomedical materials. Still there are only few reports on the use of these nanofibers as reinforcement in polymer composites. In this paper, solution electrospinning was employed to produce nanofibrous mats impregnating two epoxy resins to form “monolayer“ systems, with the aim to study the influence of the nanofibers on both the curing behaviour and the morphology of the resin systems. Three polymers were chosen for producing electrospun mats, a polysulfone (PSF), a polyamide Nylon 6,6 (Ny66) and a po…
Coupled Electric and Hydraulic Control of a PRS Turbine in a Real Transport Water Network
2019
Although many devices have recently been proposed for pressure regulation and energy harvesting in water distribution and transport networks, very few applications are still documented in the scientific literature. A new in-line Banki turbine with positive outflow pressure and a mobile regulating flap, named Power Recovery System (PRS), was installed and tested in a real water transport network for the regulation of pressure and flow rate. The PRS turbine was directly connected to a 55 kW asynchronous generator with variable rotational velocity, and coupled to an inverter. The start-up tests showed how automatic adjustment of the flap position and the runner velocity variation are able to c…
Review on Life Cycle Assessment of Solar Photovoltaic Panels
2020
The photovoltaic (PV) sector has undergone both major expansion and evolution over the last decades, and currently, the technologies already marketed or still in the laboratory/research phase are numerous and very different. Likewise, in order to assess the energy and environmental impacts of these devices, life cycle assessment (LCA) studies related to these systems are always increasing. The objective of this paper is to summarize and update the current literature of LCA applied to different types of grid-connected PV, as well as to critically analyze the results related to energy and environmental impacts generated during the life cycle of PV technologies, from 1st generation (traditiona…
Propedeutics and practice of research in Methodology programs of undergraduate Sociology degrees in Argentina and other Latin American countries
2020
Los programas de materias de Metodología de la Investigación en carreras universitarias de grado en Sociología, principalmente de Argentina (2018), constituyen el objeto de análisis del presente artículo. Partiendo de interrogantes en torno a los modos en que se enseña a investigar, se escogió analizar programas en tanto documentos que cristalizan y brindan indicios de prácticas y discursos formativos. Si bien los programas distan de las prácticas en las aulas, ofrecen información significativa y permiten ampliar la muestra respecto a la observación in situ. Los resultados del relevamiento se organizaron en dos ejes: las variantes en las propuestas de enseñanza y las maneras de entender las…