101 resultados para Polímeros condutores intrínsecos (PCIs)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Ciência e Tecnologia de Materiais - FC
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Pós-graduação em Ciência e Tecnologia de Materiais - FC
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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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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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O livro expõe a trajetória de Stephen Gray (1666‑1736), cientista inglês que dedicou sua vida à Astronomia e à Física, especificamente na área da Eletricidade, e realizou uma série de experimentos que levaram a conclusões inéditas para a época. Sua principal descoberta foi perceber que existem dois tipos de substâncias com propriedades elétricas muito distintas, hoje conhecidas como condutores e isolantes. A obra mostra que Gray foi o primeiro cientista da história a atribuir aos metais e outros condutores a propriedade de atrair corpos leves colocados em suas proximidades, fenômeno que atualmente é conhecido como indução ou polarização elétrica. E também o pioneiro na criação de eletretos, substâncias que apresentam uma eletrização de longa duração, mostrando ainda como preservar temporalmente a eletrização dos corpos. Os autores apresentam uma breve biografia do cientista Stephen Gray, que apesar de sua importância permanece bastante desconhecido dos pesquisadores contemporâneos, principalmente brasileiros, uma vez que seus escritos e experimentos carecem de divulgação no país. Por conta dessa condição, a obra traz a tradução de seus dez artigos sobre eletricidade. Os experimentos de Gray são contextualizados, ilustrados com figuras didáticas e explicados com base nos conhecimentos atuais da Física. O livro mostra também como reproduzir os principais experimentos do cientista inglês com a utilização de materiais de baixo custo. De acordo com os autores, com o objetivo de motivar outros cientistas a se aprofundarem nessas pesquisas e a desenvolverem a obra de Gray de forma que seja utilizada no ensino, o livro busca “resgatar a memória desse grande pesquisador, que tinha um olhar afiado, era bastante preciso em suas explicações, criativo em suas ideias e muito claro em seus textos”
Aplicação de redes NeuroFuzzy ao processamento de peças automotivas por meio de injeção de polímeros
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The injection molding of automotive parts is a complex process due to the many non-linear and multivariable phenomena that occur simultaneously. Commercial software applications exist for modeling the parameters of polymer injection but can be prohibitively expensive. It is possible to identify these parameters analytically, but applying classical theories of transport phenomena requires accurate information about the injection machine, product geometry, and process parameters. However, neurofuzzy networks, which achieve a synergy by combining the learning capabilities of an artificial neural network with a fuzzy set's inference mechanism, have shown success in this field. The purpose of this paper was to use a multilayer perceptron artificial neural network and a radial basis function artificial neural network combined with fuzzy sets to produce an inference mechanism that could predict injection mold cycle times. The results confirmed neurofuzzy networks as an effective alternative to solving such problems.
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Chemical imprinting technology has been widely used as a valuable tool in selective recognition of a given target analyte (molecule or metal ion), yielding a notable advance in the development of new analytical protocols. Since their discovery, molecularly imprinted polymers (MIPs) have been extensively studied with excellent reviews published. However, studies involving ion imprinted polymers (IIPs), in which metal ions are recognized in the presence of closely related inorganic ions, remain scarce. Thus, this review involved a survey of different synthetic approaches for preparing ion imprinted adsorbents and their application for the development of solid phase extraction methods, metal ion sensors (electrodes and optodes) and selective membranes.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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In view of theoretic increase in efficiency of nitrogen fertilizers for controlled release, this study aimed to evaluate the effect of nitrogen, using conventional urea and ureas coated by different polymers, in the leaf N content, leaf chlorophyll index, components production and grain yield of irrigated corn in growing season and second crop in the savannah region. The experiments were conducted at experimental area belonging to UNESP - Ilha Solteira, located in Selviria - MS in a dystrophic Red Latosol (Haplustox), clayey texture. The statistical design was randomized blocks, with four repetitions, in a 4 x 4 factorial arrangement, being four nitrogen doses (0, 40, 80 and 120 kg ha(-1)) applied at sidedressing and four urea sources (a conventional urea and three coated with polymers in different compositions and concentrations). The coated ureas are not efficient under the soil and climate conditions studied of the savanna, because they provided results similar to the conventional urea for the production components and grain yield of corn in the first and second crop. The increment of nitrogen doses increase linearly the leaf N content and grain yield of corn in the first and second crop.
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Technological advances achieved during the twentieth century strongly boosted the scientific research in the area of condensed matter physics, especially in the study and development of new semiconductor materials. In the segment, the development of semiconducting polymers for application in electronic devices promotes the field of organic electronics...(Complete abstract click electronic access below)
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This work was developed in order to reduce the discrepancy found between the stock data of an item in the system and the amount found physically in stock in the company presented on this study case. Therefore, this paper makes a study on system of information that can assist in the collection, control and manipulation of data regarding the company's stock. It is very important to do the inventory management, so we can control the level of this sub-product to meet sales orders and production. In the study discussed below, we used the Six Sigma methodology to identify points that had flaws in the process and thus improve their work where the results show grater process control and provide a reliable database to the point where no further problems of lack of components in stock
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One of society concerns are preserving the environment and the growing energy demand. These two issues are in conflict since most of the energy used today in some way harms the environment. Then is essential to develop and implement ways to clean and renewable energy. In this way, solar energy stands out as a source of clean energy, renewable, abundant and acessible. Solar energy can be harnessed by photovoltaic cells or by solar collectors. The aim of this article is analysethe yield of the solar heather assembled with hydraulic conductive and plastic bottles using three different materials for hydraulic conductors, in order to compare these efficiences and analyze material which has the best cost-benefit in this type of application. The materials analyzed in this study were copper, aluminum and PVC. For this analysis were assembled three alike solar heaters using each one of these materials, and were done several series of measurements of the temperature water output to each heat with flow between 10 and 30 liters per hour. With these data we can analyze the yield and the performance of copper, aluminum and PVC in this application. So we can conclude that aluminum has a higher efficiency, followed by PVC, and the copper had the lowest efficiency. This behavior kept for all values of flow rates examined