999 resultados para Modal decomposition


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Modal analysis is widely approached in the classic theory of power systems modelling. This technique is also applied to model multiconductor transmission lines and their self and mutual electrical parameters. However, this methodology has some particularities and inaccuracies for specific applications, which are not clearly described in the technical literature. This study provides a brief review on modal decoupling applied in transmission line digital models and thereafter a novel and simplified computational routine is proposed to overcome the possible errors embedded by the modal decoupling in the simulation/ modelling computational algorithm. © The Institution of Engineering and Technology 2013.

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The propulsion of most of the operating satellites comprises monopropellant (hydrazine - N2H4) or bipropellant (monometilydrazine - MMH and nitrogen tetroxide) chemical systems. When some sample of the propellant tested fails, the entire sample lot shall be rejected, and this action has turned into a health problem due to the high toxicity of N2H 4. Thus, it is interesting to know hydrazine thermal behavior in several storage conditions. The kinetic parameters for thermal decomposition of hydrazine in oxygen and nitrogen atmospheres were determined by Capela-Ribeiro nonlinear isoconversional method. From TG data at heating rates of 5, 10, and 20 C min-1, kinetic parameters could be determined in nitrogen (E = 47.3 ± 3.1 kJ mol-1, lnA = 14.2 ± 0.9 and T b = 69 C) and oxygen (E = 64.9 ± 8.6 kJ mol-1, lnA = 20.7 ± 3.1 and T b = 75 C) atmospheres. It was not possible to identify a specific kinetic model for hydrazine thermal decomposition due to high heterogeneity in reaction; however, experimental f(α)g(α) master-plot curves were closed to F 1/3 model. © 2013 Akadémiai Kiadó, Budapest, Hungary.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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El presente boletín FAL, analiza la participación histórica que el ferrocarril ha tenido en la distribución modal de América Latina y presenta algunas recomendaciones para mejorar su funcionamiento y convertirlo en una opción real, competitiva y sostenible.

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This FAL bulletin analyzes data for commodities traded and transportation used between nine South American countries, during the years 2000, 2006, and 2010.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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En este Boletín FAL se analizan los datos relativos a los productos comercializados y a los modos de transporte utilizados entre ocho países sudamericanos en los años 2000, 2006 y 2010.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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This FAL Bulletin analyzes data on commodities traded and the modes of transport used between nine South American countries, during 2000, 2006, 2010 and 2013. The aim is to identify the current modal split in intraregional freight transport in South America, and to ascertain the level and evolution of trade flows, imbalances and the burden of transport and insurance costs. The authors conclude with some policy recommendations.

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En el presente Boletín FAL se analizan datos sobre el comercio de productos básicos entre nueve países de América del Sur en 2000, 2006, 2010 y 2013 y los modos de transporte utilizados para ello. El objetivo es determinar la distribución modal del transporte de mercancías intrarregional e identificar el nivel y la evolución de los flujos comerciales, los desequilibrios y la incidencia de los costos de transporte y seguros. Para concluir, los autores presentan algunas recomendacionesde políticas.