139 resultados para Permeabilidade Modelosmatemáticos
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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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The disadvantages generated by the acid etching of the dentin, such as an increase in its permeability, in the surface moisture and in the potential to denature the external dentinal collagen, the formation of a fragility zone and the citotoxicity of the adhesive monomers; which are all aggravated by the depth of the dentin, have stimulated new and different treatment philosophies of the dentin. The purpose of the present study, therefore, was to investigate the effects of three dentin treatments: laser irradiation, acid etching and hypermineralization, in the shear bond strength of the SMP Plus bonding system. Sixty bovine incisors were extracted and randomly selected immediatly alter the animal's death. They were kept frozen (-18C) for no longer than 14 days. After buccal dentinal surface had been exposed, X-Rays were taken to control the dentin thickness. The specimens were separated into two groups: (1) Control, kept in distilled water at 4C; (2) Mineralized, kept in hypermineralized solution at 4C for 14 days. Each group was divided into three sub-groups according to the type of dentin treatment used: group F - followed the manufacturer instructions (acid-etching + primer + bond), group AL (acid-etching + primer + bond + laser) and group LA (laser + (laser + acid-etching + primer + bond). A composite resin standard cylinder (Z100-3M) was bond to the dentinal surface and the shear bond strength performed on a Universal lnstron machine 4301, with 500 Kg load and at 0,5mm/min. speed. The analysis of variance (ANOVA) determined that the treatments influenced the shear bond strength values (p<0,05) with the following average shearing load at failure: AL (9,96 MPa), F (7,28MPa) e LA (4,87 MPa). The interaction between the two factors analyzed Group (control and mineralized) and treatment (F, AL, LA) also influenced the shear bond strength (p<0,05). The highest values were obtained...
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A presente inveno apresenta a sntese do peptdeo AcWahxKTTKS, onde foi adicionada sequncia me (KTTKS) uma molcula de cido caprico, que um cido graxo insaturado composto por 6 tomos de carbono, encontrado naturalmente nas gorduras e leos minerais, para conferir um grau de lipofilicidade ao peptdeo e favorecer na permeabilidade do mesmo na pele. Adicionou-se tambm o triptofano, que um aminocido aromtico essencial para a nutrio humana, visando proporcionar fluorescncia ao peptdeo e assim quantific-lo na pele atravs de um mtodo mais eficiente e sensvel. O triptofano foi acetilado para diminuir a interao do peptdeo com a gua, a fim de ajudar na penetrao do peptdeo na pele. O peptdeo AcWahxKTTKS estimula a sntese de colgeno nos fibroblastos, reduzindo ou eliminando, desta forma, as rugas e linhas de expresso na pele.
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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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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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The geophysical methods may be employed in aquifer system studies, as determination of groundwater level, soil/rock contact, beyond estimative of the aquifer thickness horizon. The geoeletric methods are particularly relevant in evaluations of the oilfields systems, due to directs relations between porosity and electrical resistivity, which allow inferences about oil and gas production. The indirect estimative of the productions in free aquifers system is something complex before of the diverse variables responsible for factors or physical phenomena, as clays minerals, which conditioned the physical parameters by electric geophysical methods. This paper present analyzed correlation among electrical resistivity, chargeability and direct measure flow in shallow wells, for determination of statistical relationships between parameters and evaluation of the geological constraints evolved. The study count with the 23 shallow wells located in free aquifer, constituted by alteration materials of the granites localized in Caapava do Sul (RS). The geophysical data are acquired by vertical electric sounding in Schlumberger array. The correlations between electrical resistivity and flow, chargeability and flow, thickness of the soil/saprolite and flow indicated relationships between physical and hydrogeologic parameters, with variations conditioned by factors as porosity, permeability, besides intrinsic geological heterogeneities such soil variable thickness and rock fragments with several alteration degrees.
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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A anlise morfomtrica de uma microbacia uma importante ferramenta de diagnstico da susceptibilidade degradao ambiental, pois os resultados nortearo o planejamento, o manejo e a implementao de medidas mitigadoras para conservao dos recursos hdricos. O presente trabalho teve como objetivo a caracterizao morfomtrica da microbacia do Ribeiro Tabuleta Piquete (SP) atravs do Sistema de Informaes Geogrficas Arcview e da Carta Planialtimtrica de Lorena SP e Delfim Moreira - MG, editadas pelo IBGE (1970), em escala 1:50000. As variveis avaliadas foram as dimensionais, da composio da rede de Drenagem e do padro de drenagem. As bases cartogrficas utilizadas foram a carta planialtimtrica de Lorena SP e Delfim Moreira - MG, editadas pelo IBGE (1970), em escala 1:50000, para a hierarquizao da rede de drenagem e a anlise morfomtrica. Os resultados permitiram concluir que a microbacia apresenta altos riscos de susceptibilidade a eroso e degradao ambiental, sendo fundamental a manuteno da cobertura vegetal e as zonas riprias para conservao dos servios ambientais. O fator de forma e a densidade de drenagem alta permitiram inferir que o substrato tem permeabilidade baixa com menor infiltrao e maior escoamento da gua. A alta declividade das encostas (montanhoso) indica se no for conservada pode haver alterao na regulao do sistema hidrolgico e consequentemente na produo de gua. O Sistema de Informaes Geogrficas ArcGis 9.3 foi excelente na digitalizao e anlise dos dados.
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A morfometria uma ferramenta de grande importncia como diagnstico de suscetibilidade a degradao ambiental, delimitao da zona ripria, planejamento e manejo da microbacia. O presente trabalho teve como objetivo a caracterizao morfomtrica da microbacia do Ribeiro Benfica Piquete (SP) atravs do Sistema de Informaes Geogrficas Arcview e da Carta Planialtimtrica de Lorena SP e Delfim Moreira - MG, editadas pelo IBGE (1970), em escala 1:50000. As variveis avaliadas foram as dimensionais, do padro de drenagem e do relevo. A base cartogrfica utilizada foi as cartas planialtimtricas de Lorena SP e Delfim Moreira - MG, editadas pelo IBGE (1970), em escala 1:50000, para a hierarquizao da rede de drenagem e a anlise morfomtrica. Os resultados permitiram concluir que a microbacia apresenta altos riscos de susceptibilidade a eroso e degradao ambiental, sendo fundamental a manuteno da cobertura vegetal e as zonas riprias para conservao dos servios ambientais. O fator de forma e a densidade de drenagem alta permitiram inferir que o substrato tem permeabilidade baixa com menor infiltrao e maior escoamento da gua. A alta declividade das encostas (montanhoso) indica que se a microbacia no for conservada pode haver alterao na regulao do sistema hidrolgico e consequentemente na produo de gua. O Sistema de Informaes Geogrficas ArcGis 9.3 foi excelente na digitalizao e anlise dos dados.
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The study aimed mapping of the land use capacity classes for the Rio das Pedras watershed, Itatinga-SP in order to provide another mechanism of environmental planning for the studied area. It was used 1:10,000 topographic letters for the slope map generation which was overlaid with the studied area soil map. It was applied the judgment table criteria method, for generation of land use capacity map of the studied area. It were identified the following results: First, class III with constraints in relation of low fertility and restrictions about erosion risks on high slope areas. Second, class VI with the same characteristics of class III however with the presence of an aggravating factor of sand texture in all horizons, resulting in high risks of erosion events, especially in high slopes areas, and contamination by pollutants due the high soil permeability. Conclusions: It was verified that the more critical regions for land use capacity classes were VIs and mainly VIes class. The last one has more high relief areas and the presence of Neossolo Quartzarenico soil, with a big erosion propensity. The land use capacity map allow making different decisions for each region of the watershed respecting their individual characteristics.
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Conselho Nacional de Desenvolvimento Cientfico e Tecnolgico (CNPq)
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Ps-graduao em Cincia dos Materiais - FEIS