Return Stroke
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Clinical swallowing prognostic indicators in patients with acute ischemic stroke
RESUMO Alterações da deglutição são observadas em mais de 50% dos pacientes com acidente vascular cerebral isquêmico (AVCI) agudo. Objetivo Identificar os indicadores de prognóstico clínico da funcionalidade da deglutição na população com AVCI em fase aguda, visando o estabelecimento de indicadores de priorização de atendimento fonoaudiológi
Arq. Neuro-Psiquiatr.. Publicado em: 29/07/2019
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2. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are responsible for most lightning damage associated with thermal effects. In this s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2009
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3. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are responsible for most lightning damage associated with thermal effects. In this s
Publicado em: 2009
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4. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
Este trabalho apresenta o primeiro estudo quantitativo da corrente contínua (Icc) em descarga de retorno de raios nuvem-solo negativos (NS-) naturais no Brasil. A Icc presente em alguns raios é uma corrente de baixa intensidade, mas que pela sua longa duração transfere uma grande quantidade de carga elétrica. É, portanto responsável pelos danos associ
Publicado em: 2009
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5. Evaluation of the Characteristics of Lightning Return Stroke Electromagnetic Fields Generated by Cloud-to-Ground Lightning. / Avaliação do Comportamento dos Campos Eletromagnéticos Gerados por Descargas Atmosféricas Nuvem-Terra
The occurrence of lightning discharges causes a significant amount of unscheduled supply interruptions in overhead lines of electricity systems, contributing to decrease quality indicators of these systems, even in the case of regions with moderated ground flash density. Focusing on the distribution systems, great part of the problems are related to the indu
Publicado em: 2007
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6. "Avaliação de correntes de descargas atmosféricas através de medições diretas em estruturas altas" / Lightning current discharge evaluation through direct measure in tall towers
The characteristics of lightning currents have a fundamental importance on insulation coordination and on the design of transmission and distribution lines equipment. The CIGRE cumulative frequency distribution curves relative to the main parameters of the first and subsequent downward flashes, which are very frequently used for the evaluation of the lightni
Publicado em: 2005
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7. Estudo das características de relâmpagos nuvem-solo negativos através da análise comparativa de observações por múltiplas técnicas. / Study of negative cloud-to-ground lightning features from comparative analysis of observations by multiple techniques.
For the first time in Brazil, an electric field antenna for lightning radiation, with 1.25 µs resolution was developed. From thunderstorms over Sao José dos Campos, between February and March of 2003, information of lightning synchronized to GPS time, were simultaneously obtained by this antenna, by a 1ms resolution high-speed camera and by the Brazilian L
Publicado em: 2004
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8. Estudo das características de relâmpagos nuvem-solo negativos através da análise comparativa de observações por múltiplas técnicas. / Study of negative cloud-to-ground lightning features from comparative analysis of observations by multiple techniques.
For the first time in Brazil, an electric field antenna for lightning radiation, with 1.25 µs resolution was developed. From thunderstorms over Sao José dos Campos, between February and March of 2003, information of lightning synchronized to GPS time, were simultaneously obtained by this antenna, by a 1ms resolution high-speed camera and by the Brazilian L
Publicado em: 2004
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9. Modelagem matemática de correntes na torre da estação Morro do Cachimbo (Brasil). / Mathematical modelling of current in the Morro do Cachimbo station tower (Brazil).
The effect of an elevated strike object on the measured current in the top and the bottom of Morro do Cachimbo (MCS) station instrumented tower is modeled, considering a current divisor applied at the tower top, and that the channel current is supplied by the current source located at the attachment point. The mathematical formulations of the engineering mod
Publicado em: 2003
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10. A study of the lightning characteristics in Brazil based on an analysis of the performance of the lightning location system / Estudo de relâmpagos no Brasil com base na análise de desempenho do sistema de localizacao de tempestades
The harmful lightning effects on the mankind have motivated several investigations on lightning characteristics in the world and, particularly, in Brazil. Many studies on the geographic, seasonal, topographic and demographic features of lightning have been done using lightning location systems (LLS). The LLS, which is located in the southeastern region of Br
Publicado em: 2000
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11. Estudo da forma de onda de campo elétrico de relâmpagos / Study of the electric field waveform of lightning.
Neste trabalho são analisadas formas de onda de campo elétrico da radiação eletromagnética gerada por relâmpagos ocorridos na cidade de São José dos Campos e vizinhança. Para a aquisição das formas de onda de campo elétrico foi utilizado um aparato composto por uma antena ligada a uma eletrnica, a qual processa o sinal proveniente da antena e o
Publicado em: 2000
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12. Analysis and modelling of negative downward lightning current curves between 1985 and 1994 at Morro do Cachimbo research station (MG) / Analise e modelagem de curvas de corrente de relampagos negativos descendentes entre 1985 e 1994, na estacao de pesquisa do Morro do Cachimbo - MG
In this thesis is presented an analysis of 22 negative descendent lightning collected in Brazil from 1985 to 1994 in the Morro do Cachimbo research station (43o 58 26 W, 20o 0039 S) of the Companhia Energética de Minas Gerais (CEMIG). The historic evolution of direct discharge measurements and the thecniques involved are summarised. From the comparation of
Publicado em: 1998