MOOC. El nuevo fenómeno de Educación y formación a distancia

[SPA] Los MOOC (Massive Open Online Course) son un fenómeno en alza dentro de los cursos de formación en línea. Esta comunicación es fruto del marco teórico realizado como proyecto de Tesis Doctoral sobre la formación a distancia. Donde se realiza una introducción al concepto MOOC y su historia. Se exponen las tendencias MOOC, en referencia a su finalidad y estructura. Además, se explican las características generales comunes a todas las plataformas MOOC. Por otro lado, se analizan las posibilidades de futuro de este tipo de formación. Así pues, en esta comunicación se expone una visión general de los MOOC como herramienta de enseñanza y aprendizaje. [ENG] The MOOC (Massive Open Online Course) are a growing phenomenon within the online training courses. This communication is the result of the theoretical framework conducted as thesis project on distance learning. Where an introduction to the MOOC concept and history is made. The MOOC trends are discussed in reference to its purpose and structure. Besides the general characteristics common to all platforms MOOC explained. On the other hand the future possibilities of this type of training are discussed. Thus, in this paper an overview of the MOOC is exposed as a tool for teaching and learning

Valoración preliminar del valor pedagógico del software educativo (Apps) para tabletas digitales (iPad) en Educación Primaria

[SPA] En este trabajo se presentan parte de los resultados de la investigación llevada a cabo en el TFM (Trabajo Fin de Máster) del Máster de Investigación e Innovación en Educación Infantil y Primaría, sobre una valoración previa del valor pedagógico de las Apps para el iPad en el ámbito de Educación Primaria. La investigación fue de corte descriptivo con un enfoque exploratorio. Para ello se evaluaron 50 Apps Educativas de Apple, a través del instrumento EEAPP.es. Consideramos que los resultados obtenidos pueden ser de mucha utilidad y que las conclusiones e implicaciones que aquí se presentan son de gran interés para la comunidad educativa. [ENG] Presents part of the results of research conducted in the TFM (Master's Thesis) Master of Research and Innovation in Early Childhood and Elementary, on a prior assessment of the educational value of the Apps for the iPad in this work the field of primary education. The research was descriptive cutting an exploratory approach. For this purpose we evaluated 50 Apps Educational Apple through EEAPP.es instrument. We believe that the results can be very useful and that the conclusions and implications presented here are of great interest to the educational community

Variable speed liquid chiller drop-in modeling for predicting energy performance of R1234yf as low-GWP refrigerant

This paper presents a model for a variable-speed liquid chiller integrating a compressor model based on Buckingham π-theorem to accurately predict the system performance when R134a is replaced with R1234yf, using a wide range of data obtained from an experimental setup. Relevant variables such as temperature, pressure, mass and volumetric flow rates, compressor power consumption and rotation speed were measured at several positions along the refrigeration and secondary circuits and were used to validate the developed model. Model results show that cooling capacity and power consumption predicted values are in good agreement with experimental data, within ±5%, being slightly higher for the deviation obtained for R134a than for R1234yf. Moreover, model results indicate that R1234yf has a reduction of coefficient of performance (COP) compared with R134a (between 2 and 11.3%), and that R1234yf COP reduction is diminished at intermediate volumetric flow rate and higher inlet temperature for the evaporator secondary fluid, respectively. On the other hand, an environmental analysis based on TEWI (total equivalent warming impact) method showed that direct emissions are almost negligible for R1234yf. However, there are no environmental benefits in terms of indirect greenhouse gas emissions using R1234yf without system modifications (as for instance the addition of internal heat exchanger or R1234yf new design components), which are required to reduce the liquid chiller climate change contribution using it as low GWP alternative in comparison with the typically used R134a refrigerant

La bellota de Quercus insignis Martens & Galeotti, 1843, la más grande del mundo

Quercus insignis M. Martens & Galeotti, better known as “chicalaba” in Mexico is a critically endangered oak species and it is characterized by producing the biggest acorns in the world. Despite of its ecological importance as a dominant component in cloud forests in Veracruz, Mexico, its habitat is facing high deforestation rates. In this review, we describe the chicalaba, its distribution, uses and some ecological aspects to promote its propagation and management including ecological restoration programs

Core saturation effects of geomagnetic induced currents in power transformers-NC-ND 4.0

Abstract Saturation of the magnetic core of transformers in a power system is an important effect that can be attributed to solar Geomagnetic Induced Currents (GICs). This saturation can conduce to voltage-control problems, generating harmonic currents, and heating of the transformer internal components, leading to gas relay alarm/operation and possible damage. This paper presents an analog physical reduced scale model of GICs in power transformers. The instrumentation employed to carry out this study consists of a single-phase reduced scale transformer, a controllable current source, a resistive load and a data acquisition system. The work establishes not only that it is possible to model the behavior of magnetic variables and to extrapolate the results to large full size power transformers, but also provides insight into GICs generation and their effects on power transformers. Obtained results are related to the non-linear behavior of GICs due to asymmetric saturation of the magnetic core in the power transformer, where computational model simulation is not able to give acceptable outcomes. Results are discussed for several GICs magnitudes, which include voltage, current, harmonics waveforms, magnetic core point of operation, the behavior of the stray flow, instantaneous power and core temperature. All Rights Reserve

Population structure and spatial distribution of the gastropod molluscs Osilinus atrata and Osilinus sauciatus in the rocky intertidal zone of the Canary Islands (Central East Atlantic)

Por medio de un diseño de muestreo jerárquico se estudió la estructura poblacional y los patrones espaciales de variabilidad horizontal (diferencias entre las islas, las localidades dentro de las islas y los sitios dentro de localidades) y vertical (diferencias entre bandas de la zona intermareal) de los moluscos gasterópodos Osilinus atrata y O. sauciatus a lo largo del intermareal rocoso de las Islas Canarias. Se observaron diferencias en los patrones espaciales de distribución, abundancia y tamaño para ambas especies. Osilinus atrata fue más abundante que O. sauciatus en todo el Archipiélago Canario. Su abundancia varió entre las islas, presentando una distribución heterogénea entre las bandas intermareales de una isla a otra, si bien fue más frecuente en las bandas intermedia y superior. Osilinus sauciatus sólo se encontró en las islas orientales y no exhibió diferencias significativas entre las bandas, a pesar de que 91.35% de los individuos aparecieron en la banda superior y el resto en la banda intermedia. Osilinus sauciatus mostró una talla mayor que las de O. atrata. A su vez, ambas especies presentaron en general las mayores tallas medias en la banda superior.A hierarchical sampling design was used to study the population structure and the horizontal (differences among islands, locations within islands and sites within locations) and vertical (differences among intertidal bands) distribution patterns of the gastropod molluscs Osilinus atrata and O. sauciatus along the rocky intertidal zone of the Canary Islands. Differences in the spatial patterns of abundance, size and distribution were recorded for both species. Osilinus atrata was more abundant than O. sauciatus throughout the archipelago. Its abundance varied among islands and it presented a heterogeneous distribution in the bands from one island to another, though it was more frequent in the middle and high bands. Osilinus sauciatus was only found at the eastern islands and did not exhibit significant differences between the bands, even though 91.35% of the individuals appeared in the high band and the rest in the middle band. On the other hand, O. sauciatus had a larger mean size than O. atrata, but both species presented the largest mean sizes in the high band.Este estudio se realizó dentro del proyecto “Canarias, por una Costa Viva” del Ministerio de Medio Ambiente (Secretaría General de Costas) y la Universidad de Las Palmas de Gran Canaria (http://www.canariasporunacostaviva.org)

VISUALIZACIÓN DE MODELOS 3D DE TRANSFORMADORES TIPO SECO EN REALIDAD AUMENTADA (VIEWING 3D MODELS OF DRY-TYPE TRANSFORMERS IN AUGMENTED REALITY)

Resumen En la actualidad existen técnicas de visualización en realidad virtual para simular y evaluar el ensamble de partes de un nuevo producto en una etapa temprana de diseño, pero con el avance de la tecnología, es posible realizar los mismos procesos en un entorno real gracias a la realidad aumentada. El proyecto aquí propuesto pretende hacer uso de la realidad aumentada en dispositivos móviles inteligentes con el fin de mejorar y agilizar los procesos de fabricación y ventas de los transformadores de distribución tipo seco reduciendo errores en la etapa de validación dimensional de piezas, bajando los tiempos de fabricación y ofrecer este tipo de visualización a clientes finales con el objetivo de que comprendan como estará construido su transformador antes de que esté fabricado. Palabras clave: Diseño CAD, Modelos 3D, Realidad aumentada, Unity. Abstract Currently there are virtual reality visualization techniques to simulate and evaluate the assembly of parts of a new product at an early design stage, but with the advancement of technology, it is possible to carry out the same processes in a real environment thanks to the augmented reality. The project proposed here aims to make use of augmented reality in smart mobile devices in order to improve and streamline the manufacturing and sales processes of dry-type distribution transformers, reducing errors in the dimensional validation stage of parts, lowering the time of manufacture and offer this type of visualization to end customers in order to understand how their transformer will be built before it is manufactured. Keywords: CAD Design, 3D Models, Augmented Reality, Unity

Sistema de visión sinérgico para detección de movimiento

La detección de movimiento en sistemas de vigilancia y monitoreo se ve favorecida por la combinación sinérgica de diferentes tipos de cámaras y su óptima distribución sobre el área de interés. Se propone un modelo de optimización para un sistema de visión sinérgico basado en programación lineal entera. Los objetivos son encontrar la posición y orientación óptima de cada una de las cámaras direccionales y omnidireccionales con el fin de maximizar la cobertura del espacio de trabajo y detectar los objetos en movimiento presentes. Para detectar eficientemente el movimiento, incluso ante cambios de luminosidad globales, se utiliza un algoritmo de substracción de fondo que usa la información espacial de la textura. El método propuesto se evalúa en un conjunto representativo de escenarios reales utilizando una red de cámaras. Los resultados muestran que nuestro algoritmo es capaz de determinar el número mínimo de cámaras necesario para cubrir un área determinada

Sostenibilidad de la producción de camarón en la Unidad Empresarial de Base Calisur del municipio Río Cauto (Original)

The article responds to the need and the interest to maintain of sustainable way shrimp's production of cultivation in the Unidad Empresarial de Base (UEB) Calisur in front of the accelerated climatic change. The investigation accomplished in 2019 prioritizes measures and actions to raise the perception of risk, to increase the level of knowledge and the inhabitants' grade of participation and the workers in the confrontation to the climatic change, giving opportune answer to the Task Life. They expose the principal environmental problems diagnosed, that they need an attention prioritized in the intensive production of the shrimp of cultivation, food highly demanded on the market international. They gather the principal aspects once the benefits that you contribute this line in the cost-reducing social order and his impact in the local development were related to. You reveal the feasibility of the applied actions in terms of solving the identified problems and maintaining the production to short, medium and long term, making the fulfilment possible and over-fulfilment of the production schedules of the cultivation of this shellfish in the area in addition to get better and to recover the water bodies and the coastal ecosystem that has been impacted by promotion of the half level of the sea and the advance of the saline wedge at the municipality, I Laugh Cautious.El artículo responde a la necesidad y el interés de mantener, de manera sostenible, la producción de camarón de cultivo en la Unidad Empresarial de Base (UEB) Calisur, ante el acelerado cambio climático. La investigación realizada en el 2019 prioriza las medidas y acciones para elevar la percepción del riesgo, aumentar el nivel de conocimiento y el grado de participación de los pobladores y los trabajadores en el enfrentamiento al cambio climático, dando respuesta oportuna a la Tarea Vida. Se exponen las principales problemáticas ambientales diagnosticadas, que precisan de una atención priorizada en la producción intensiva del camarón de cultivo, alimento altamente demandado en el mercado internacional. Se recogen los principales aspectos relacionados con los beneficios que aportan este renglón en el orden económico social y su impacto en el desarrollo local. Revela la factibilidad de las acciones aplicadas en función de solucionar los problemas identificados y mantener la producción a corto, mediano y largo plazo, haciendo posible el cumplimiento y sobrecumplimiento de los planes de producción del cultivo de este crustáceo en el área, además de mejorar y recuperar los cuerpos de agua y el ecosistema costero que ha sido impactado por ascenso del nivel medio del mar y el avance de la cuña salina en el municipio Río Cauto

Comparative evaluation of R1234yf, R1234ze(E) and R450A as alternatives to R134a in a variable speed reciprocating compressor

A comparative energetic evaluation of R1234yf, R1234ze(E) and R450A as alternatives to R134a in a variable speed compressor is carried out. A compressor model based on dimensionless numbers was obtained using the Buckingham p -theorem, which was validated with experimental data; showing that the prediction error of the model is lower than ± 10% and ± 2 K for temperature. The experimental data were obtained by testing R134a, R1234yf, R1234ze(E) and R450A for a wide range of operating condi- tions. Results obtained with the validated model, show that the dimensionless approach provides a similar estimation of energy parameters compared with the experimental results, such as power con- sumption, refrigerant mass fl ow rate, cooling capacity, COP, discharge temperature and compressor ef- fi ciencies for each refrigerant tested using the dimensionless approach proposed. The comparative evaluation of the compressor predictions shows a reduction in the cooling capacity obtained with R1234yf, R450A and R1234ze(E), in comparison with R134a. Also, COP values for R1234yf, R450A, and R1234ze(E) are lower than those obtained from R134a. Finally, results shows that the dimensionless correlation compressor model can be used to predict the performance of other reciprocating compres- sors, at similar operating conditions for a wide range of compressor rotation speed, with a reasonable accuracy.The authors thankfully acknowledge to the "Consejo Nacional deCiencia y Tecnología (CONACYT)” for their support to this study, and to the “Ministerio de Educación, Cultura y Deporte” (Grant number FPU12/02841) for sponsoring this work through “Becas y Contratosde Formación de Profesorado Universitario del Programa Nacional de Formación de Recursos Humanos de Investigación del ejercicio 2012”