998 resultados para Tensão Concentração


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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)

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Ps-graduao em Engenharia Eltrica - FEIS

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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)

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The relationship between the microstructure and the magnetic properties of soft magnetic materials, have been studied by different researchers who seek to employ electrical systems, increasing their life span and reduce their energy consumption. Following this same line the Brazilian Synchrotron Light Laboratory developed a new synchrotron light source, the Sirius, where magnetic materials with high magnetic permeability values are being studied for use in accelerator dipoles. The low carbon steel is a ferromagnetic material that has a great relationship between cost and magnetic permeability. Aiming to raise the values of permeability of the material, heat treatments were done and evaluated the magnetic properties, microstructure and mechanical properties to correlate them. It was noted that the thermal annealing were the most effective, and the annealing performed with a small time threshold, which only phenomenon observed was the primary recrystallisation, was the most elevated values of magnetic permeability of the material, due to the average grain size ideal achieved. The heat treatments do not guide the magnetic domains of the material and not influence the mechanical properties of the material due to lack of carbon in the microstructure. The annealing treatments were shown to be an alternative to raising the values of the magnetic permeability of the material and facilitate the implementation of ultra low carbon steel in the dipoles of Sirius

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The study of the generation of landfill gas contributes to the understanding of the relationship between gas production and other parameters, such as time of disposal of waste and moisture (rainfall) and, thus, can subsidize the viability study for energy. This study aims to evaluate the interference of the time of disposal of waste and moisture (rainfall) in the production and composition of biogas generated at the landfill in Rio Claro - SP. As a result it was observed that for the landfill studied, the average percentage of methane in biogas ranged from 49.9% to 54.7%. It was found that moisture (rainfall) and the time of waste disposal are parameters which do not cause significant changes in methane concentration in biogas. However, when analyzed the flow of biogas, which had the maximum average value of 152.86m3/h and minimum average value of 15.47m3/h was observed great interference of moisture (rainfall) and the time of disposal of waste, because well of gas located in newer areas of the landfill showed higher values of flow rate than the areas where the landfill was the beginning of the arrangement. The same way, it was observed that in the dry season flow of biogas decreased in all drains gas analyzed

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Atmospheric Discharges are responsible for several lost in the electrical system therefore its done studies to find ways to reduce the problem caused by discharges. This branch of engineering is necessary the gathering, stock and analysis of large quantity of data to validate or refuse the many studies produced about it The CENDAT proposed a project to collect data on induced voltages in distribution lines and current waveform of the lightning, but a difficulty that arose was the accumulation of data due to lack of manpower available to catalog all the data collected. Thinking in this difficulty, the engineer Acacio Silva Neto CENDATs researcher with trainees began to develop a program to solve this problem. This work keeps the development of this program in order to solve the problem of accumulation of data

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No perodo da menopausa, a incidncia de doenas cardiovasculares em mulheres equivalente a dos homens, e assim os gastos pblicos com sade nesta populao em particular, aumentam significativamente, uma vez que as mulheres possuem maior longevidade se comparadas aos homens. Os mecanismos celulares e/ou moleculares pelos quais ocorre maior incidncia de hipertensão arterial em mulheres aps a menopausa ainda no so claros. Uma variedade de fatores parece contribuir para a elevao de presso arterial na menopausa, entre eles destacam-se a deficincia de estrognio, o aumento do estresse oxidativo, a disfuno endotelial, a elevao da atividade do sistema renina-angiotensina, a elevao nos nveis plasmticos de testosterona, as alteraes no perfil lipdico e o aumento no ganho de peso. Trabalhos prvios mostram que os efeitos benficos do exerccio fsico sobre o sistema cardiovascular esto relacionados a maior produo de xido ntrico e/ou sua biodisponibilidade para o msculo liso vascular. Este ltimo mecanismo tem sido relacionado com elevao da atividade da enzima antioxidante superxido dismutase (SOD), que representa um importante mecanismo de defesa celular contra a formao de radicais livres. Objetivo: avaliar os nveis plasmticos da enzima superxido dismutase em resposta a um programa de treinamento fsico aerbio por 8 semanas realizado em mulheres no climatrio. Mtodos: A amostra foi constituda por 31 mulheres normotensas (49,31,2 anos) e 15 hipertensas (52,21,6 anos) todas diagnosticadas no perodo do climatrio e sedentrias... (Resumo completo, clicar acesso eletrnico abaixo)

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Inflammatory bowel disease (IBD) is a chronic and relapsing disease caused by exaggerated response of the immune system. It represents a significant health problem by limiting the quality of life and being the main risk factor for colorectal cancer. Despite of its importance, the high worldwide incidence and being the object of research for several decades, the etiology remains unknown. Studies indicates an interaction between genetic and environmental factors which together with the intestinal microbiota, leads to an uncontrolled immune response. One of the aggravating environmental factors often discussed is stress, as the daily life of the population in general is increasingly rushed. In order to demonstrate the influence of stress on IBD, this study aimed to standardize an experimental model of colitis induced by instillation of a trinitrobenzene sulfonic acid (TNBS) noninflammatory concentration plus exposure to stress that intensify the inflammation. Therefore, an experiment was done to determine what would be the noninflammatory concentration. In this step, four different concentrations of TNBS (1, 6, 12.5 or 40mg/ml) were tested and the lowest concentration capable of inducing a noninflammatory response in the gut was defined as 1 mg/ml. Then, a second experiment was performed which induced colitis and exposed the animals to restraint stress. The results, however, showed that this stimulus was not enough to exacerbate the damage caused by the 1 mg/ml concentration of TNBS in the colon. With some changes in the protocol, the third experiment associated cold and restraint, as well as changes on the day of euthanasia, which occurred immediately after the stress session. The results of myeloperoxidase activity measurement were unexpected due to the noninflammatory concentration of TNBS caused an intestinal inflammation similar to the concentration of 40 mg/ml. However, the results of glutathione quantification and the corticosterone ...