954 resultados para Electric corona


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The challenge of reducing carbon emission and achieving emission target until 2050, has become a key development strategy of energy distribution for each country. The automotive industries, as the important portion of implementing energy requirements, are making some related researches to meet energy requirements and customer requirements. For modern energy requirements, it should be clean, green and renewable. For customer requirements, it should be economic, reliable and long life time. Regarding increasing requirements on the market and enlarged customer quantity, EVs and PHEV are more and more important for automotive manufactures. Normally for EVs and PHEV there are two important key parts, which are battery package and power electronics composing of critical components. A rechargeable battery is a quite important element for achieving cost competitiveness, which is mainly used to story energy and provide continue energy to drive an electric motor. In order to recharge battery and drive the electric motor, power electronics group is an essential bridge to convert different energy types for both of them. In modern power electronics there are many different topologies such as non-isolated and isolated power converters which can be used to implement for charging battery. One of most used converter topology is multiphase interleaved power converter, pri- marily due to its prominent advantages, which is frequently employed to obtain optimal dynamic response, high effciency and compact converter size. Concerning its usage, many detailed investigations regarding topology, control strategy and devices have been done. In this thesis, the core research is to investigate some branched contents in term of issues analysis and optimization approaches of building magnetic component. This work starts with an introduction of reasons of developing EVs and PEHV and an overview of different possible topologies regarding specific application requirements. Because of less components, high reliability, high effciency and also no special safety requirement, non-isolated multiphase interleaved converter is selected as the basic research topology of founded W-charge project for investigating its advantages and potential branches on using optimized magnetic components. Following, all those proposed aspects and approaches are investigated and analyzed in details in order to verify constrains and advantages through using integrated coupled inductors. Furthermore, digital controller concept and a novel tapped-inductor topology is proposed for multiphase power converter and electric vehicle application.

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Les dones medievals es van relacionar amb tot tipus d’objectes i edificacions què avui considerem obres d’art. Un dels àmbits privilegiats en aquest espai de relació és el que es denomina de manera genèrica “promoció artística”, concepte que comprèn la possibilitat de pensar, edificar, contractar i comprar produccions artístiques. Aquest estudi es centre en els territoris de la Corona d’Aragó entre els segles XIII i XV, en ple gòtic català. Tracta de perfilar diversos perfils de dona amb diferents estatus socials, actituds vitals i àmbits d’actuació. Hi ha un ventall entre el públic i el privat, el laïcisme i la religiositat, entre elles i el seu temps

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This paper focus on the problem of locating single-phase faults in mixed distribution electric systems, with overhead lines and underground cables, using voltage and current measurements at the sending-end and sequence model of the network. Since calculating series impedance for underground cables is not as simple as in the case of overhead lines, the paper proposes a methodology to obtain an estimation of zero-sequence impedance of underground cables starting from previous single-faults occurred in the system, in which an electric arc occurred at the fault location. For this reason, the signal is previously pretreated to eliminate its peaks voltage and the analysis can be done working with a signal as close as a sinus wave as possible

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En un mundo hiperconectado, dinámico y cargado de incertidumbre como el actual, los métodos y modelos analíticos convencionales están mostrando sus limitaciones. Las organizaciones requieren, por tanto, herramientas útiles que empleen tecnología de información y modelos de simulación computacional como mecanismos para la toma de decisiones y la resolución de problemas. Una de las más recientes, potentes y prometedoras es el modelamiento y la simulación basados en agentes (MSBA). Muchas organizaciones, incluidas empresas consultoras, emplean esta técnica para comprender fenómenos, hacer evaluación de estrategias y resolver problemas de diversa índole. Pese a ello, no existe (hasta donde conocemos) un estado situacional acerca del MSBA y su aplicación a la investigación organizacional. Cabe anotar, además, que por su novedad no es un tema suficientemente difundido y trabajado en Latinoamérica. En consecuencia, este proyecto pretende elaborar un estado situacional sobre el MSBA y su impacto sobre la investigación organizacional.

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This paper offers a productivity growth estimate for electric energy commercialization firms in Colombia, using a non-parametric Malmquist bootstrap methodology. The estimation and methodology serve two main purposes. First, in Colombia Commercialization firms are subject to a price-cap regulation scheme, a non-common arrangement in the international experience for this part of the industry. Therefore the paper’s result suggest an estimate of the productivity factor to be used by the regulator, not only in Colombia but in other countries where commercialization is a growing part of the industry (renewable energy, for instance). Second, because of poor data collection from regulators and firms themselves, regulation based on a single estimation of productivity seems inappropriate and error-prone. The nonparametric Malmquist bootstrap estimation allows an assessment of the result in contrast to a single one estimation. This would open an opportunity for the regulator to adopt a narrower and more accurate productivity estimation or override an implausible result and impose a productivity factor in the price-cap to foster the development of the industry.

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Este articulo tiene como objetivo principal describir el área de Sostenibilidad de la Organización Corona en Colombia como parte de un proyecto de investigación, que abordar los conceptos claves de Responsabilidad Social Empresarial, y a su vez los asocia con la realidad del área de Sostenibilidad de esta empresa. Esta Investigación hace parte de la implementación de un proyecto de investigación aplicada que tiene como fin consolidar la documentación existente sobre las áreas de Responsabilidad Social y Sostenibilidad de empresas con operación en Colombia. A su vez, busca observar la aplicación del concepto de estructura organizacional y gestión ambiental dentro del área para estudiar, conocer y evaluar a profundidad su funcionamiento. Se describió la situación actual y funcionamiento del área de sostenibilidad, y para ello se procedió con la elaboración de entrevistas y estudio de los documentos públicos y privados del área, mediante los cuales se analiza, organiza y presenta la información. Esto tiene como resultado presentar el funcionamiento del área de sostenibilidad en Corona y su interrelación con las demás áreas de la compañía.

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A partir de diferentes leyendas y aspectos históricos, se estudian conceptos de astronomía y de matemáticas. Se plantean diferentes problemas en los que se recorren temáticas como el calendario o las eclipses. Las soluciones a estos problemas se incluyen en el número posterior de la revista .

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Expediente que incluye un informe del fiscal del Consejo Real Pedro Rodríguez Campomanes y dos cédulas reales, que reglamentan y ordenan la existencia de una persona en cada villa de los Reinos de la Corona española, encargada de llevar los libros en los que se registran contratos, pleitos, fraudes e inconvenientes relacionados con negocios de hipotecas. Se enumeran las funciones del escribano encargado de realizar dichos registros, así como las instrucciones para realizar copias de los documentos y para la organización de los mismos.

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Se hace referencia al homenaje a Gerardo Diego con motivo de su jubilación docente. Se incluyen, además, versos dedicados a Gerardo firmados por varios Catedráticos-poetas.

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Resumen basado en el de la publicación

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Título anterior de la publicación : Boletín de la Comisión Española de la UNESCO

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Two common methods of accounting for electric-field-induced perturbations to molecular vibration are analyzed and compared. The first method is based on a perturbation-theoretic treatment and the second on a finite-field treatment. The relationship between the two, which is not immediately apparent, is made by developing an algebraic formalism for the latter. Some of the higher-order terms in this development are documented here for the first time. As well as considering vibrational dipole polarizabilities and hyperpolarizabilities, we also make mention of the vibrational Stark effec

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Quantum molecular similarity (QMS) techniques are used to assess the response of the electron density of various small molecules to application of a static, uniform electric field. Likewise, QMS is used to analyze the changes in electron density generated by the process of floating a basis set. The results obtained show an interrelation between the floating process, the optimum geometry, and the presence of an external field. Cases involving the Le Chatelier principle are discussed, and an insight on the changes of bond critical point properties, self-similarity values and density differences is performed