2958 research outputs found
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Analytical switching loss model for superjunction MOSFET with capacitive nonlinearities and displacement currents for DC–DC power converters
Get PDFA new analytical model is presented in this study to predict power losses and waveforms of high-voltage silicon superjunction MOSFET during hard-switching operation. This model depends on datasheet parameters of the semiconductors, as well as the parasitics obtained from the printed circuit board characterization. It is important to note that it also includes original features accounting for strong capacitive nonlinearities and displacement currents. Moreover, these features demand unusual extraction of electrical characteristics from regular datasheets. A detailed analysis on how to obtain this electrical characteristic is included in this study. Finally, the high accuracy of the model is validated with experimental measurements in a double-pulse buck converter setup by using commercial SJ MOSFET, as well as advanced device prototypes under development.This work was supported by the Asturian Gobernment through the grant Beca Predoctoral “Severo Ochoa” BP14–140. This work was also supported by the project E2 SG, cofunded by grants from Belgium, Italy, Austria, Germany, Spain, The Netherlands, Portugal, Slovakia, The U.K., and the ECSEL
Evaluación de sensores hiperespectrales para la estimación del carbono orgánico del suelo
Get PDFThe aim of this work is to identify the most suitable sensors and regions of the spectrum for estimation of soil organic carbon in southwest Asturias (northwest Spain). Three hyperspectral sensors (Hyperion, CASI, and AHS) and one multispectral, Landsat-5 TM, are evaluated. The reflectance spectra of a set of soil samples are resampled for the different sensors and PLSR (Partial Least Squares Regression) models of TOC are calibrated for several regions of the spectrum. The results are compared and the most important regions of the spectrum for estimation of TOC are determined.Gobierno del Principado de Asturias (Proyecto SV-PA-13-ECOEMP-40 y ayuda predoctoral del Programa “Severo Ochoa” BP14-104).
Universidad de Oviedo (contrato predoctoral 2013 para la formación en investigación y docencia).El objetivo de este trabajo es la identificación de los sensores y regiones del espectro más adecuados para la estimación del carbono orgánico del suelo (TOC) en el suroccidente de Asturias (noroeste de España). Se evalúan tres sensores hiperespectrales (Hyperion, CASI y AHS) y uno multiespectral, Landsat-5 TM. Los espectros de reflectividad de un conjunto de muestras de suelo se remuestrean para los distintos sensores y se calibran modelos PLSR (Partial Least Squares Regression) de TOC para varias regiones del espectro. Se comparan los resultados y se determinan las regiones del espectro más importantes para la estimación de TOC
Informe Actividad Comercial en Asturias 2015
Get PDFDescripción de la actividad comercial en Asturias durante el año 2015
La enfermedad de Rendu-Osler-Weber en Asturias, 1996-2013
Get PDFsupport actions improve strategic information and resources necessary for their care. Improve system ER epidemiological surveillance based on records
Innovación Sanitaria
No full textConsejería de Sanidad. Gobierno del Principado de AsturiasII Jornadas e-Health en Asturias. Gestión Sanitaria en la era del e-Pacient
La atrofia muscular espinal en Asturias, 1996-2013
Get PDFIncrease information and improve epidemiological surveillance of this type of pathology. Deepen the knowledge and facilitate the planning of health policies in the Principality of Asturias
Voltammetric determination of size and particle concentration of Cd-based quantum dots
Get PDFIn this article, we present two novel methodologies, using a simple electrochemical approach, for the
determination of the size and particle concentration of Cd-based Quantum Dots (QDs), nanoparticles
widely used as photoluminescent labels in many bioanalytical applications. Such QDs were analyzed
directly in organic medium and in water after derivatization with an amphiphilic polymer. Screenprinted
carbon electrodes modified with a bismuth film were employed as the electrochemical platform.
The herein proposed methodologies allow the reliable determination of very low nanoparticle
concentrations. Detection limits achieved with the selected experimental conditions were of 3.0 1012
nanoparticles mL1 for CdSe QDs dispersed in organic medium and of 6.0 1012 nanoparticles mL1 for
water-solubilized CdSe/ZnS QDs (both with a core size of 3.26 nm). However, detection limits could be
improved increasing the QDs sample volume or the voltammetric deposition time. Furthermore, the
proposed methodologies allowed the determination of the CdSe QDs diameters. Results obtained were
validated after comparison with standard spectroscopic approaches.
The electrochemical characterization of QDs, disclosed in this work, allows to perform a synthesis
control with a simple, inexpensive and fast approach
La interpretación jurisprudencial del artículo 41.3 LJCA: un obstáculo en el acceso a la casación y apelación tributaria
Get PDFTowards archaeology of colonization: living in-between continents in the Early Modern period
No full textOf all the archaeology topics addressed by European historiography of the 20th century, the period following the 15th century is the most neglected. And currently it still is. In the 21st century, it thrives more dynamically even if not in a cohesive way but rather through a scattered and sometimes confusing process. Furthermore, currently there is such a range of semantics to address this period that it is almost impossible to provide a concise overview that comprise all existing perspectives. Additionally, the most interesting works developed in Europe are coincidentally those that present a clear and progressive approach towards the interpretative models of historical archaeology.Investigación subvencionada por el Gobierno del Principado de Asturias a través del Programa “Severo Ochoa” de Ayudas Predoctorales para la investigación y docencia del Principado de Asturias
Sobre el uso de herramientas informáticas para la cuantificación cerámica: el EVE 2.0
Get PDFIn the following lines, a renewal of the quantification index EVE («estimated vessel equivalent») ispresented. Using the Geoespatial Information Technologies, especially the GIS, CAD and 3D modelling,we propose the EVE 2.0. This method of quantification is able to asign to each pottery fragmentsa percentage value with respect to entirety, regardless of other elements or variables whichcould modify this measurement. In this sense, we are able to relate this units of analysis (potteryfragments) with a specific artefact or vessel. From a quantitative point of view, the EVE 2.0 is an impartial measurement, not affected by fracturability. It can obtain information about the proportions of a specific type inside a group, and allows us to compare proportions among groups. Finally,the use of the percentage value is a required procedure which allow us to plan more sophisticated methods of quantification.Vicerrectorado de Investigación y Campus de Excelencia Internacional de la Universidad de Oviedo en convenio con la Università di Bologna. Programa “Severo Ochoa”de Ayudas Predoctorales, Universidad de Oviedo.En el presente trabajo abordamos la renovación del índice de cuantificación cerámica EVE («equivalentede vasija estimado»). Mediante el uso de las Tecnologías de Información Geoespacial:concretamente el SIG, CAD y modelado 3D, hemos formulado el EVE 2.0. Esta metodología de cuantificación es capaz de asignar a cada uno de los fragmentos un valor porcentual con respecto a una totalidad, independientemente de otros factores o variables que puedan alterar esta medida.Conseguimos por tanto relacionar esas unidades de análisis (o fragmentos cerámicos) con un artefacto básico o recipiente cerámico. Desde el punto de vista cuantitativo el EVE 2.0 es una medida imparcial, no afectada por la fracturabilidad, capaz de obtener datos acerca de las proporciones de determinado tipo dentro de un conjunto al mismo tiempo que permite comparar las proporciones que obtengamos entre éste y otros grupos. El uso de un valor porcentual es un procedimiento necesario que permite poner en marcha métodos cuantitativos más sofisticados.Palabras clave: cerámica, cuantificación, EVE, CAD, modelado 3D