899 resultados para Matriz laplaciana


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Pós-graduação em Engenharia Mecânica - FEB

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Seeking alternatives for the total or partial substitution of synthetic fibers for natural fibers, with reinforcement in polymeric materials, this work was conducted with the objective of evaluating the treatment with corona discharge on the adherence of juta fibers with resin. The fibers were exposed to corona discharge for 1, 5, 10 and 15 minutes, as well as after treatment with hot water, molding composites fiber-reinforced with filaments treated for 10 and 15 minutes, and without the treatment. The chemical structures were evaluated by spectrometry in the region of Fourier transform infrared with attenuated total reflection (FTIR/ATR), observing the formation of a new band and the increase in the absorption of groupings with oxygen. The thermal analyses, such as thermogravimetry (TG) and differential scanning calorimetry (DSC) revealed the degradation of cellulose, hemicellulose and lignin. The microstructural characterization by scanning electron microscopy (SEM) showed changes in the surface of the fiber, such as roughness, superficial depressions, surface degradation and cavity formation. The adhesion of the fibers was evaluated by the pullout test, allowing us to verify the increase in adhesion strength after treatment with corona discharge. In conclusion, the treatment with corona discharge changes the surface of the juta fibers, resulting in better adherence with the resin.

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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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En este trabajo se presenta un análisis sistémico del sector de salud en el Brasil, basado en el estudio de la estructura productiva sectorial y sus interacciones con los demás sectores de la economía. Se utilizan datos inéditos divulgados por el Instituto Brasileño de Geografía y Estadística (ibge) sobre las Cuentas Nacionales de Salud y se propone una metodología de compatibilización del Sistema de Cuentas Nacionales (matriz de insumo-producto) con las Cuentas Satélite de Salud relativas a los años 2000 y 2005. Esa compatibilización permite entender las relaciones entre el sector de salud y los demás sectores de la economía por medio de indicadores de insumo-producto.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)