52 resultados para Avaliação da porosidade e permeabilidade
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Pós-graduação em Engenharia Civil - FEIS
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Geociências e Meio Ambiente - IGCE
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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This study investigated the following aspects regarding a soakaway, i.e. an infiltration well: i) entrance filter device; ii) permeability of the geotextile; and iii) emptying time. The 3.6 m³ infiltration well drains a roof area of 241.8 m². The entrance device is made up of layers of sand, gravel and geotextile set on a metal structure. The concrete rings that form the lateral walls were covered with geotextile, and bricks were laid between the soil and concrete rings. The infiltration well remained in operation during the entire testing period, and specific events were simulated to measure the emptying time. Permeability and fine particle tests were carried out after eight months of operation. Samples of geotextile taken from the bottom, the walls and the entrance device presented average permeability reductions of approximately 50.7%, 7.7% and 21.2%, respectively. The sand in the entrance device retained around 34.8% of fine particles and the gravel retained 0.13% in the same period. The infiltration rate was approximately 34.7 mm/h. The R2 coefficient for measured and calculated times was 0.97.
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The use of geostatistical techniques allows detection of the existence of dependence and the spatial distribution of soil properties, thus constituting an important tool in the analysis and detailed description of the behavior of soil physical properties. The aim of the present study was to use geostatistics in assessment of physical properties in a Latossolo (Oxisol) dystrophic under native forest and pasture in the Amazon region of Manicore. Grids with of 70 x 70 m were established in native forest and pasture, and points were marked in these grids spaced at every 10 m, for a total of 64 points. These points were then georeferenced and in each one, soil samples (128) were collected at the depths of 0.00-0.20 and 0.40-0.60 m for a survey of their physical properties. These grids are parallel at a distance of 100 m from one another. The following determinations were made: texture, bulk density and particle density, macroporosity, microporosity, total porosity and aggregate stability in water. After tabulating the data, descriptive statistical analysis and geostatistical analysis were performed. The pasture had a slight variation in its physical properties in relation to native forest, with a high coefficient of variation and weak spatial dependence. The scaled semivariograms were able to satisfactorily reproduce the spatial behavior of the properties in the same pattern as the individual semivariograms, and the use of the parameter range of the semivariogram was efficient for determining the optimal sampling density for the environments under study. The geostatistical results indicate that the removal of native forest for establishing pasture altered the natural variability of the physical properties.
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In the present work it was studied the behavior of four water bath curing cycles of heat activated acrylic resin considered as long duration (I – 65ºC for 30 min;50ºC for 23h and 30min; and 100º C for 1h; II- 50ºC for 24h and the rapid cycle), compared to the known long time curing cycle (9 hours for 72ºC) and short curing cycle (1 h for 65ºC; 30 min to elevate at 100º C and 1:00 to 100º C). Analysis consisted of observations and verification of the residual monomer, weight alterations, dimensional, dimensional lineal, porosity and hardness to determine material performance. The results pointed out that residual monomer presented statistical significant differences in the factor storage and interaction among the factors cycle X storage for weight alteration; statistical significant differences for the factor storage for lineal dimensional alterations, without significant differences for hardness. Porosity was verified in minimum degree in the cycle III and in appreciable amount in the cycle IV
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The process of electric arc welding with shielding gas (GMAW) is being increasingly used in various industrial applications. This process occurs by which an electric arc is established between the work piece and a consumable in the form of wire, the arc melts the wire continuously as it is fed to the weld pool. The weld metal is protected from the atmosphere by flowing a gas (or gas mixture) inert or active. This paper presents a study of the welding process GMAW - MIG on aluminum tubes, alloy 6101 - T6, used in the manufacture of armored busbar, intended for driving electric power plants. 5(five) were welded specimens, changing certain welding parameters at each time was monitored welding joint as well as the interpass temperature. Tests were performed bending, tensile and macrographical analysis of body-of-evidence and through its results was possible to reach a better welding condition, which minimizes the appearance of pores, since the porosity has great influence on the mechanical strength and electrical conductivity of welded pipes
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Fármacos com alta permeabilidade intestinal, ampla faixa terapêutica e ausência de evidências documentadas de bioinequivalência ou problemas de biodisponibilidade devido à formulação, foram considerados bioisentos pela ANVISA (RDC 37/2011), ou seja, os fármacos que se encaixam nesta categoria não necessitam de estudos de biodisponibilidade relativa/bioequivalência para serem comercializados. Dentre os catorze produtos que receberam a bioisenção da ANVISA, encontra-se o fluconazol, antifúngico aprovado atualmente para ser comercializado em vários países, inclusive no Brasil, onde inúmeras opções comerciais do produto fluconazol cápsulas, genérico ou similar, podem ser adquiridas. Tendo em vista a bioisenção do produto fluconazol cápsulas e sua larga utilização no mercado brasileiro, o estudo do perfil de dissolução deste produto torna-se relevante. Sendo assim, este trabalho avaliou 2 produtos genéricos e 2 produtos similares frente ao medicamento referência em relação aos seus perfis de dissolução e a similaridade entre eles. Os resultados foram avaliados seguindo a RDC 31/2011 da ANVISA que prevê o cálculo do fator de similaridade entre os perfis de dissolução. E, pôde-se observar que apenas 1 medicamento genérico apresentou o fator de similaridade adequado (entre 50 e 100), sendo 51,60, os demais medicamentos testes apresentaram valores fora do intervalo adotado pela ANVISA. Através desses resultados, conclui-se que intercambialidade do medicamento referência pelo medicamento genérico ou similar não é adequada, uma vez que eles não são considerados iguais, salvo um dos medicamentos genéricos.
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The evaluation of soil permeability throughout the weathering profile is one of the most important features to be considered in environmental studies. This study, developed from field testing and analysis of data obtained by geostatistical methods, aims at mapping the permeability around the Ribeirão Claro river. The intent is to simulate an accident with toxic liquids where soil permeability is of fundamental importance. Another purpose of the research was to determine the minimum time that, in the event of an accident, a possible contaminant to reach the water table level and be routed to the nearest drain, in this case, the Ribeirao V Claro river constitutes fundamental information. The studied area of approximately 4 km² is located within the UNESP-Rio Claro campus, consisting of colluvial soil from Fm. Rio Claro superimposed on residual soil of Fm. Corumbataí. The method used to determine the permeability is the concentric cylinders performed on a sampling grid with 64 points containing spacing of 5 meters EW and 10 meters NS. In the places of permeability tests were collected samples for laboratory determination of the percentage of fines. From particle size analysis was performed and analysis statistical and geostatistical on this data. The histogram was based on the statistical studies, and the semivariograms were based on geostatistical estimation methods. Based on the comparison between the maps and the data obtained, it was determined that the percentage of fines in colluvial surface soil has little influence on permeability, which the proximity to the Ribeirao Claro river, the eastern portion, a factor that influences the distribution of permeability values
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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A importância da agroecologia se dá no sentido de fornecer e ser, base e estrutura de conhecimentos mesclados, incorporando saberes tradicionais aos saberes técnicos científicos atuais, sem excluir ou rejeitar, mas usando ambos a favor da transição para uma pratica agrícola mais sustentável e coerente com os fluxos e com a complexidade natural de um ecossistema, o que não se percebe nas práticas agrícolas modernas e convencionais. Inúmeros estudos constataram que para uma boa efetividade de sistemas agroecológicos é necessário recuperar e manter o equilíbrio biológico do solo, pois isso influenciará em suas características físicas e químicas. O objetivo desse trabalho foi de caracterizar o solo sob Sistema Agroflorestal (SAF) e uma Pastagem, no município de Rio Claro (SP), para a obtenção de atributos do solo, morfológicos, físicos e químicos e também descrever a diversidade do extrato arbóreo presente na área, incluindo as espécies agrícolas, e levantar o histórico de implantação do sistema, de modo a criar e dar início a formação de um banco de dados científicos para o Grupo de Extensão Gira-Sol. Foram escolhidos dois perfis nas seguintes situações: sistema agroflorestal e uma Pastagem para descrição morfológica do solo. Em cada área foi efetuada a coleta de amostras deformadas e indeformadas e caracterizados os atributos granulometria, analises química, densidade do solo, porosidade do solo e resistência à penetração. Para a descrição morfológica dos perfis foi utilizado os procedimentos descritos por Lemos e Santos (2002), para os atributos químicos e de fertilidade do solo, Camargo et al. (1986) e EMBRAPA (1997), para granulometria, densidade e porosidade do solo e argila dispersa em água. A descrição da vegetação foi feita com auxilio de guias de identificação e por meio de parcelas, onde as espécies foram tabeladas e plotadas em um mapa da área para localização das mesmas, e.