538 resultados para Distribuição altitudinal


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This work is to analyze the behavior of context concentrated stresses generated around a nozzle connected to a pressure vessel. For this analysis we used the finite element method via a computer interface, the software ANSYS WORKBENCH. It was first necessary to study and intensive training of the software used, and also a study of the ASME Code, Section VIII, which is responsible for the standards used in pressure vessels. We analyzed three cases, which differ primarily in the variation of the diameter of the nozzle in order to analyze the variation of the stresses according to the variation of the diameters. The nozzle diameters were 35, 75 and 105 mm. After the model designed vessel, a pressure was applied on the innervessel of 0.5 MPa. For the smallest diameter, was found the lowest tensions concentrated. Varying between 1 and 223 MPa. Increasing the diameter of the nozzle resulted in increased tensions concentrated around the junction nozzle /vessel. The maximum stresses increased by 78% when the value was increased in diameter from 35 to 75 mm. Since the increase in diameter from 75 to 105 mm, the values of the tensions increased around 43%. These figures emphasize that stress concentrations increased with increasing the diameter of the nozzles, but not linearly

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A coruja-buraqueira (Athene cunicularia) nidififica no chão e, com frequência, ocorre em ambientes bastante urbanizados como no campus universitário da UNESP em Botucatu, SP região centro-oeste paulista. Os objetivos do estudo foram descrever as características físicas das escavações, distribuição espacial, formas de utilização e avaliar que elementos presentes nas áreas urbanas são importantes para a seleção dos sítios de nidificação. Foram monitorados 6 grupos familiares desde 2011, cuja população e o número de ninhos foram contabilizados e a localização, georeferenciados. Os dados comportamentais foram registrados em caderno de campo, fotografados e filmados. A densidade populacional no câmpus foi de 0,03 indivíduos por Km² com os sítios de nidificação vizinhos tendo a distância mínima de 140,0 metros e máxima de 378 metros. As tocas apresentaram 50,6± 5,6cm de diâmetro, a maioria construída em terreno com declive. As corujas selecionaram sítios de nidificação em áreas abertas e gramadas contendo no entorno poleiros naturais (árvores, arvoretas, arbustos) e artificiais (placas, postes, peitoral de janelas, etc) e próximos a bueiros e postes com iluminação artificial. Estes dois últimos constituíram atrativos paras as suas presas (artrópodes e roedores) e a análise de ergagrópilas revelou a ocorrência de 5 grupos taxonômicos de artrópodes: 65,4% de Coleóptera, 27,2% de Orthoptera, 4,6% de Blatodea, 1,4% de Aranae, 0,9% de Hymenoptra e 0,4% de Mantodea. Os resultados obtidos mostraram que as corujas-buraqueiras levaram em consideração características como oferta abundante de alimento, principalmente, de artrópodes que se concentravam nas área iluminadas e nos bueiros. A estabilidade temporal dos sítios de nidificação nestes três anos de monitoramento acompanhada de sucesso reprodutivo de 50% revela que a despeito do intenso tráfego de veículos e transeuntes no campus, o ambiente ...

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Due to the high level of service required by customers and the constant need to reduce costs, the logistics can be considered as a strategic area for a company. In particular, the order picking is responsible for most of the operating costs in a warehouse. Therefore it’s necessary to plan the materials storage in order to maximize the space available and minimize the total distance traveled to meet customer orders. For these reasons, this study aims to examine and propose a way to organize the electrical materials storage in distribution centers through a study on an electronics company in Cajamar

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Ce document présente l'analyse de la qualité de l'énergie dans une centrale solaire photovoltaïque - avec une capacité installée de 1 MWpico, relié au réseau de distribution d’électricité en 11,9 kV, qui a comme but connaître et également de comparer à la norme nationale actuelle, les effets de la qualité de l'énergie électrique résultant de l'utilisation de cette type matrice génératrice. Le rapport a été basé sur des niveaux spécifiés dans le module 8 des Procédures de distribution d'électricité dans le réseau national d'électricité - PRODIST, qui précise les directrices sur la question de la qualité de l'énergie électrique sur le territoire brésilien. Il a été considéré aussi les recommandations internationales 929 et 1547, qui proposent des pratiques recommandées concernant des systèmes de génération de l'énergie solaire PV (photovoltaïque), et également des normes pour le raccordement de ces types de sources au réseau de distributions d'électricité, tous deux établis par l'Institut des ingénieurs électriciens et électroniciens, largement connu comme IEEE. Le développement et le travail sur le terrain a eu lieu de manière continué, et non dans des moments spécifiques, assurant de cette manière, la fiabilité des données obtenues

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Distribution networks are formed by long lines that carry electricity substations to homes and industries. These lines have associated impedance and depending on operating conditions of the network these impedances may vary. This paper provides a detailed analysis of the effects observed in studies of voltage drop, short circuit and electrical losses, when considered the drivers sequence impedances used in primary distribution network at different temperatures. Therefore, it is initially presented a calculation methodology and details the factors that influence the final values. The methodology presented tackles in a practical way the main factors that directly or indirectly influence the values of the impedances as an emblematic example and will be properly dealt with throughout the paper is the effect of temperature on the values of the sequence impedances. More specifically is dealt with the case of XLPE cables protected, by having a higher maximum operating temperature than the operating temperature of the network. The effects observed in the power flow generated when considering the impedance values at both temperatures were analyzed. The impedance drivers tend to increase with increasing temperature. Thus the impedance of the conductor XLPE protected will tend to be greater for the maximum operating temperature for which the operating temperature of the network, resulting in greater voltage drop and higher electrical losses

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Engenharia Elétrica - FEIS

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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

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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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Pós-graduação em Engenharia Elétrica - FEIS