97 resultados para Layout de instalações
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Mestrado em Segurança e Higiene do Trabalho.
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Mestrado em Segurança e Higiene do Trabalho.
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Considering ancient monuments and historical buildings, it seems that these mortars have proved to be durable and reliable materials. The restoration and maintenance of old renders is one of the key aspects of correct rehabilitation practice. The ideal course of action is to replace the damaged material by a material with compatible characteristics.The study in development presents the chemical, physical and morphologic analysis performed for ancient air lime mortars belonging to historical monuments: Santa Marta Fortress in the coast line Lisbon-Cascais dated from XVII century and Defense Wall of Lisbon dated from XI century, which layout could be associated to roman period. It is important to underline that the studied samples of ancient portuguese air lime mortars, have been submitted during centuries to very severe maritime environment that includes daily cycles of wet/dry, wind, friction and the constant presence of salts, generally aggressive. However, they show very good performance and conservation state, unlike most of the new air lime mortars, which are generally considered weak, not very durable, materials. This work is included in a study intending to determine key factors to the durability of these ancient materials in presence of water. Visible reaction rims around some aggregates suggests the occurrence of pozzolanic reactions between aggregates and the lime binder that creates neoformation products, such as calcium-silico-aluminates, which seems be, besides the pores filling, the responsible for the resistance and cohesion of these ancient mortars submitted to aggressive humid environments.
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A voltage limiter circuit for indoor light energy harvesting applications is presented. This circuit is a part of a bigger system, whose function is to harvest indoor light energy, process it and store it, so that it can be used at a later time. This processing consists on maximum power point tracking (MPPT) and stepping-up, of the voltage from the photovoltaic (PV) harvester cell. The circuit here described, ensures that even under strong illumination, the generated voltage will not exceed the limit allowed by the technology, avoiding the degradation, or destruction, of the integrated die. A prototype of the limiter circuit was designed in a 130 nm CMOS technology. The layout of the circuit has a total area of 23414 mu m(2). Simulation results, using Spectre, are presented.
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Mestrado em Higiene e Segurança no Trabalho
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Trabalho Final de mestrado para obtenção do grau de Mestre em Engenharia Civil
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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica com especialização em Energia, Climatização e Refrigeração
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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica
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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica
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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica
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Relatório de Estágio para obtenção de grau de Mestre em Engenharia Civil Perfil de Edificações
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Trabalho de Dissertação de natureza científica para obtenção do grau de Mestre em Engenharia Civil do Ramo Hidráulica
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Trabalho de Projecto para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização de Estruturas
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Trabalho de Dissertação de Natureza Científica para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização em Hidráulica
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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Área de Especialização em Vias de Comunicação e Transportes