959 resultados para Fluido frigorigéneo
Efeito dos parâmetros de retificação no acabamento superficial de cerâmicas aplicadas à biomateriais
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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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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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Pós-graduação em Física - IFT
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Pós-graduação em Engenharia Mecânica - FEIS
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Geociências e Meio Ambiente - IGCE
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This study aims to analyze the capacity of a helical coil heat exchanger to reach the requested heat transfer rates by a sodium hypochlorite production process. This heat exchanger was installed in an experimental way in order to reuse a source of low-temperatures water in such a way to become a more economical alternative than the existing cooling tower. Firstly, the concepts related to the theory of heat transfer applicable to the case were introduced. Then, the mapping of the main information about the production process and the technical specification of the current cooling system equipment's was realized. Using the dimensions of the heat exchanger installed today as reference, the calculations for determining the ideal length of the coil to different flows of hot fluid were performed. Finally, it was concluded that the heat exchanger currently employed does not provide heat transfer rates required for the maximum flow rate value supported by the cooling tower
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Geociências e Meio Ambiente - IGCE
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This study aims to analyze the capacity of a helical coil heat exchanger to reach the requested heat transfer rates by a sodium hypochlorite production process. This heat exchanger was installed in an experimental way in order to reuse a source of low-temperatures water in such a way to become a more economical alternative than the existing cooling tower. Firstly, the concepts related to the theory of heat transfer applicable to the case were introduced. Then, the mapping of the main information about the production process and the technical specification of the current cooling system equipment's was realized. Using the dimensions of the heat exchanger installed today as reference, the calculations for determining the ideal length of the coil to different flows of hot fluid were performed. Finally, it was concluded that the heat exchanger currently employed does not provide heat transfer rates required for the maximum flow rate value supported by the cooling tower
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PURPOSE: To evaluate the effect of N-acetylcysteine (NAC) combined with fluid resuscitation on pulmonary cell death in rats induced with controlled hemorrhagic shock (HS). METHODS: Two arteries (MAP calculation and exsanguination) and one vein (treatments) were catheterized in 22 anesthetized rats. Two groups of male albino rats were induced with controlled HS at 35mmHg MAP for 60 min. After this period, the RL group was resuscitated with Ringer's lactate and the RL+NAC group was resuscitated with Ringer's lactate combined with 150mg/Kg NAC. The control group animals were cannulated only. The animals were euthanized after 120 min of fluid resuscitation. Lung tissue samples were collected to evaluate the following: histopathology, TUNEL and imunohistochemical expression of caspase 3. RESULTS: RL showed a greater number of cells stained by TUNEL than RL + NAC, but there was no change in caspase 3 expression in any group. CONCLUSION: N-acetylcysteine associate to fluid resuscitation, after hemorrhagic shock, decreased cell death attenuating lung injury.
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OBJETIVO: Descrever os itens alimentares mais representativos para o consumo total de energia, carboidratos, proteínas e lipídios de crianças de 7 a 10 anos. MÉTODOS: Elaborou-se uma lista com todos os alimentos consumidos com suas respectivas quantidades e quantificou-se a composição da dieta em energia e macronutrientes. A lista foi baseada em informações fornecidas pelo preenchimento de três Diários Alimentares (DA) por 85 escolares de 7 a 10 anos que frequentavam uma escola pública na cidade de São Paulo. Obteve-se o agrupamento dos alimentos em 129 itens, calculou-se o percentual de contribuição de cada item no consumo alimentar dos nutrientes e identificaram-se aqueles que contribuíram com até 95% da ingestão total de calorias e dos nutrientes selecionados. RESULTADOS: Os itens "Arroz branco, arroz à grega, arroz com legumes" e "Feijão marrom, preto, branco, lentilha" contribuíram de forma importante para o consumo de energia e carboidratos. O item "Leite integral fluido, leite integral em pó" foi representativo para o consumo de lipídios, além de proteínas e energia. Ressalta-se a importância no consumo em energia e carboidratos das bebidas doces (refrigerantes e sucos industrializados) na dieta deste grupo populacional. CONCLUSÕES: É evidente a participação do arroz no consumo alimentar total de energia e carboidratos; do feijão em energia, carboidratos e proteínas; do leite em energia, proteínas e lipídios; carnes em energia, proteínas e lipídios; e pão em energia e carboidratos. Merece destaque a participação das bebidas doces no consumo total de energia e carboidratos e das guloseimas no consumo total de lipídios.