7 research outputs found
Generación de calor por inducción magnética
Get PDFThe induction heating source is based on the Joule effect, which is that a driver will induce an electrical current, producing the motion of electrons due to the kinetic energy stored in these, resulting in heat shock that experience between them. The high-frequency electromagnetic waves are manipulated by a PWM is to generate a pulse train that varies its width. Our input power is 1000 watts, with a voltage of 110V and a current of 9.09A. We also use copper tube of 0.003 m for the coil surrounding the material to be heated.Público en genera
Aplicación de la Optimización por Enjambre de Partículas a un Problema Inverso de Conducción de Calor
Get PDFEn el presente trabajo se utiliza la optimización por enjambre de partículas (PSO) para estimar la función de generación de calor de un aparato de placa caliente con guarda (APCG). Este aparato sirve para la determinación de la conductividad térmica de materiales aislantes. La aplicación se desarrolla en una dimensión y en coordenadas cilíndricas. Las geometrías aplicadas son: un disco —para la placa caliente— y una corona —para la guarda. Se emplean desde uno hasta cinco parámetros. Los resultados se comparan con los obtenidos con el método de Levenberg-Marquardt. De esta manera, la capacidad de este método para recuperar la función analítica se prueba. Los resultados exhiben un buen ajuste con los valores
experimentales.In this work, a Particle Swarm Optimization (PSO) scheme is used to estimate the heat generation function of a Guarded Hot-Plate Apparatus (GHPA). This device is used in thermal conductivity estimation of isolant materials. Application is developed in one dimensional cylindrical coordinates. Geometries are a disc (for Hot Plate) and an annulus (for the Guard) with estimated paremeters from one to five. Results are compared with Levenberg-Marquardt method. This shows that PSO has a great capacity to recover the analytic function. Results exhibits a good agreement with experimental values
Desarrollo integral de una prótesis de brazo manufacturada con tecnología aditiva y controlada por señal mioeléctrica
Get PDFSe presenta el diseño completo de una prótesis de miembro superior para una persona con lesión por arriba de codo. La prótesis está diseñada para ser impresa en su totalidad, así pueda ser reproducida y empleada con personas de bajos recursos y su velocidad de manufactura sea rápida y simple. La prótesis cuenta con diferentes accesorios intercambiables de forma que puede ser mecánica o incluir accesorios que presentan motores para su control por señales mioeléctricas superficiales. La adquisición de la señal mioeléctrica se hace mediante 4 canales diferenciales, el procesamiento en un procesador de gama alta que entrega un resultado en menos de 256ms, así como un FPGA para diferentes procesamientos alternativos para la extracción de características y clasificación. Los comandos reclutados son básicos, solo para abrir, cerrar, flexionar y extender
Development and Integration of Automated Systems Aimed to the Comfort of Seniors and People with Disabilities
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Global human footprint on the linkage between biodiversity and ecosystem functioning in reef fishes
Get PDFCopyright: © 2011 Mora et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Difficulties in scaling up theoretical and experimental results have raised controversy over the consequences of biodiversity loss for the functioning of natural ecosystems. Using a global survey of reef fish assemblages, we show that in contrast to previous theoretical and experimental studies, ecosystem functioning (as measured by standing biomass) scales in a non-saturating manner with biodiversity (as measured by species and functional richness) in this ecosystem. Our field study also shows a significant and negative interaction between human population density and biodiversity on ecosystem functioning (i.e., for the same human density there were larger reductions in standing biomass at more diverse reefs). Human effects were found to be related to fishing, coastal development, and land use stressors, and currently affect over 75% of the world's coral reefs. Our results indicate that the consequences of biodiversity loss in coral reefs have been considerably underestimated based on existing knowledge and that reef fish assemblages, particularly the most diverse, are greatly vulnerable to the expansion and intensity of anthropogenic stressors in coastal areas
