970 resultados para São Miguel do Tocantins (TO)
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The southwestern region of the São Luís-Grajaú Basin has a rare outcrop of the Codó Formation (upper Aptian) with seven outstanding microbialite bioherms along the left margin of the Tocantins river, near Imperatriz (MA). Resting on sandstones of the Grajaú Formation, the Codó Formation presents: 1) a 20 cm thick basal calcilutite with gypsite pseudomorphs and some fossil tree stems; 2) metric dark shales with carbonate nodules and thin intercalated carbonate layers, enclosing some microbial laminites; 3) a 2 cm thick upper breccia composed of microbialite fragments and other carbonate clasts, with halite hoppers on the top; 4) the carbonate bioherms, which partially overlie the extensive shales and interrupt them laterally, as well as the breccia. The bioherms in the northern part of the outcrop are thicker (<2 m) and have interbedded dark shales, whereas the southern are thinner and continuous in the vertical direction. In general, they are composed of irregular gently to strongly wavy microbial laminites, sometimes with pseudocolumnar to conical lamination. All microbialites with highest synoptic relief (<20 cm) look like columnar stromatolites on weathered lateral expositions. In plan view, the horizontal sections of these microbialites are circular to slightly elliptic, sometimes forming very small channels (N60W) filled with fine breccia. The highest bed of the northern bioherm has mixed microbial laminites and columnar stromatolites, where intercolumnar spaces were filled with microbialite clasts, fish bones, plant fragments and very small probable crustacean coprolites. Several fractures and deformation in this upper bed indicate an initial brecciation process probably caused by subaerial exposure. In microscopic scale, the lamination is smooth, diffuse, defined by subtle granulation differences of very fine granular calcite crystals within micrite, but oxide levels, dissolution surfaces or thin precipitated calcite veneers...
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Most of small islands around the world today, are dependent on imported fossil fuels for the majority of their energy needs especially for transport activities and electricity production. The use of locally renewable energy resources and the implementation of energy efficiency measures could make a significant contribution to their economic development by reducing fossil fuel imports. An electrification of vehicles has been suggested as a way to both reduce pollutant emissions and increase security of supply of the transportation sector by reducing the dependence on oil products imports and facilitate the accommodation of renewable electricity generation, such as wind and, in the case of volcanic islands like Sao Miguel (Azores) of the geothermal energy whose penetration has been limited by the valley electricity consumption level. In this research, three scenarios of EV penetration were studied and it was verified that, for a 15% LD fleet replacement by EVs with 90% of all energy needs occurring during the night, the accommodation of 10 MW of new geothermal capacity becomes viable. Under this scenario, reductions of 8% in electricity costs, 14% in energy, 23% in fossil fuels use and CO2 emissions for the transportation and electricity production sectors could be expected.
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Tese de Doutoramento, Geologia (Riscos Geológicos), 4 de Abril de 2014, Universidade dos Açores.
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Tese de Doutoramento, Geologia (Vulcanologia), 21 de Março de 2014, Universidade dos Açores.
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Dissertação de Mestrado, Vulcanologia e Riscos Geológicos, 10 de Novembro de 2005, Universidade dos Açores.
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Dissertação de Mestrado, Engenharia Agronómica, 16 de Junho de 2014, Universidade dos Açores.
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Dissertação de Mestrado, Ciências Sociais, 20 de Maio de 2014, Universidade dos Açores.
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Dissertação de Mestrado em Vulcanologia e Riscos Geológicos
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Dissertação de Mestrado em Ciências Económicas e Empresariais
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Dissertação de Mestrado em Ciências Sociais, especialidade em Migrações e Sociedade.
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Dissertação de Mestrado em Psicologia da Educação, especialidade em Contextos Educativos.
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Dissertação de Mestrado em Gestão de Empresas/MBA.
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Dissertação de Mestrado em Ambiente, Saúde e Segurança.
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Dissertação de Mestrado em Ambiente, Saúde e Segurança.
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Dissertação de Mestrado em Ambiente, Saúde e Segurança.