Transient Currents
Mostrando 1-12 de 477 artigos, teses e dissertações.
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1. Cardiomyocyte dysfunction during the chronic phase of Chagas disease
Chagas disease, which is caused by the parasite Trypanosoma cruzi, is an important cause of heart failure. We investigated modifications in the cellular electrophysiological and calcium-handling characteristics of an infected mouse heart during the chronic phase of the disease. The patch-clamp technique was used to record action potentials (APs) and L-type C
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-04
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2. Distributed generators performance during short-circuits considering fault ride-through requirements / Desempenho de geradores distribuídos durante curtos-circuitos considerando requisitos de suportabilidade a afundamentos de tensão = : Distributed generators performance during short-circuits considering fault ride-through requirements
The increase of distributed generation penetration in distribution systems not only helps to diversify the electrical matrix but also brings both technical and economic benefits. Yet, it also raises worries related to energy supply reliability. For wind power plants into the medium and high voltage networks there are the grid codes for "Fault Ride-Through" w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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3. Simplified Mathematical Modeling for an Electromagnetic Forming System with Flat Spiral Coil as Actuator
This study presents mathematical modeling and calculation procedure for problems of electromagnetic forming of thin circular metal sheets using a flat spiral coil as actuator. The methodbased on the Biot-Savart Law focuses specifically on the calculation of the electromagnetic field generated by the flat coil and analysis of the circuit that models the elect
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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4. EFFECT OF AQUEOUS FRACTION OF LEAVES DE COSTUS SPIRALIS (JACQ.) ROSCOE CONTRACTILE FUNCTION ON HEART MAMMALS. / EFEITO DA FRAÇÃO AQUOSA DAS FOLHAS DE COSTUS SPIRALIS (JACQ.) ROSCOE SOBRE A FUNÇÃO CONTRÁTIL DO CORAÇÃO DE MAMÍFEROS.
Teas and infusions from C. spiralis leaf have largely been used by folk medicine as diuretic, hypotensor, cytotoxic, immunomodulator, antilithiasic, antidiarrheic, antispasmodic, antiurolitic, antimicrobian, antifungic, antioxidant, antileishmania activity, antiinflamatory, and antiedematogenic activity. In spite of these biological effects attributed to the
Publicado em: 2011
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5. A proposal for optimized analysis of transient currents in conductive materials. / Uma proposta para análise otimizada de correntes transitórias em materiais condutores.
In this work, a methodology is developed, based on the application of the moment method associated to a finite difference approximation, for time domain analysis of transient current distribution in conducting media. The computational procedure allows that long conductors with any cross section can be considered, approximated by filamentary elements. Thus, t
Publicado em: 2010
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6. Investigação teórico-experimental sobre a resposta de aterramentos elétricos frente a correntes de descargas atmosféricas
This work presents the results of an experimental investigation about the behavior of grounding electrodes subjected to low intensity impulsive currents, whose waveforms are similar to the lightning ones. Basically the results consist in the response of electrodes, in terms of developed voltage, to the injection of impulsive currents, considering soils with
Publicado em: 2008
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7. Resposta da Plataforma Continental Sudeste a ventos sazonais e sinóticos de verão: estudos numéricos / Response of the South Brazil bight to summer seasonal and synoptic winds: numerical studie
In order to study the pertubations caused on the South Brazil Bigth (SBB) caused by the passage of a cold front during Summer, a mean basic state for currents was obtained using the POM (Princeton Ocean Model) through diagnostic simulation, followed by a short round prognostic. The mean currents modeled are in certain instancies similar to the currents measu
Publicado em: 2008
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8. Avaliação de filtros eletromagnéticos e sintonizados LC para minimização de correntes de seqüência zero em sistemas de distribuição a quatro fios
A qualidade da energia elétrica se apresenta como uma área de grande interesse para os consumidores e concessionárias de energia elétrica. O aumento deste interesse é explicado pelo aprimoramento da legislação pertinente a esta área e ao nível de esclarecimento dos consumidores, cada vez mais conscientes de seus direitos. Em se tratando do tema qual
Publicado em: 2007
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9. AvaliaÃÃo de filtros eletromagnÃticos e sintonizados LC para minimizaÃÃo de correntes de seqÃÃncia zero em sistemas de distribuiÃÃo a quatro fios
A qualidade da energia elÃtrica se apresenta como uma Ãrea de grande interesse para os consumidores e concessionÃrias de energia elÃtrica. O aumento deste interesse à explicado pelo aprimoramento da legislaÃÃo pertinente a esta Ãrea e ao nÃvel de esclarecimento dos consumidores, cada vez mais conscientes de seus direitos. Em se tratando do tema qual
Publicado em: 2007
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10. INTERACTION BETWEEN LOW-RIPPLE SWITCHED CONVERTERS AND FUEL CEL LS / INTERAÇÃO ENTRE CONVERSORES CHAVEADOS COM BAIXA ONDULAÇÃO E CÉLULAS DE COMBUSTÍVEL
This dissertation discusses the interaction between fuel cells and the DC-DC converter just connected across its terminals. For that, it presents a modified algorithm to represent the dynamic behavior of fuel cell stacks as much the current ripple effects from power converters on such cells. PEM type fuel cells (Proton Exchange Membrane) are studied to get a
Publicado em: 2007
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11. Efeito neurodegenerativos causados pela deficiência de vitamina B1
Oxidative stress, selective neuronal loss, and diminished activity of thiaminedependent enzymes is assumed to characterize most of the neurodegenerative diseases. Thiamine deficiency (TD) models have been used to produce selective neurodegeneration basically because of the mild impairment of oxidative metabolism. In the present study, we report that TD elici
Publicado em: 2006
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12. "Determinação de características da circulação marítima forçada por ventos no litoral norte do Estado de São Paulo através de modelagem numérica hidrodinâmica" / Hydroynamics Numerical Model, northern coastal area of São Paulo state, surface winds, Wind driven currentes, seasonal and monthly variations, winds transient effects.
Uma versão do POM - Princeton Ocean Model foi implementada no litoral norte do Estado de São Paulo, região compreendida entre as longitudes 46o e 44o30W e latitudes 24o30e 23o18S, abrangendo as cidades de Bertioga, São Sebastião, Caraguatatuba e Ubatuba, da linha da costa até aproximadamente a isóbata de 100 m, para estudos da resposta do mar ao vento
Publicado em: 2006