948 resultados para Ary Oswaldo Mattos Filho


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We investigate the cosmology of the vacuum energy decaying into cold dark matter according to thermodynamics description of Alcaniz & Lima. We apply this model to analyze the evolution of primordial density perturbations in the matter that gave rise to the first generation of structures bounded by gravity in the Universe, called Population III Objects. The analysis of the dynamics of those systems will involve the calculation of a differential equation system governing the evolution of perturbations to the case of two coupled fluids (dark matter and baryonic matter), modeled with a Top-Hat profile based in the perturbation of the hydrodynamics equations, an efficient analytical tool to study the properties of dark energy models such as the behavior of the linear growth factor and the linear growth index, physical quantities closely related to the fields of peculiar velocities at any time, for different models of dark energy. The properties and the dynamics of current Universe are analyzed through the exact analytical form of the linear growth factor of density fluctuations, taking into account the influence of several physical cooling mechanisms acting on the density fluctuations of the baryonic component of matter during the evolution of the clouds of matter, studied from the primordial hydrogen recombination. This study is naturally extended to more general models of dark energy with constant equation of state parameter in a flat Universe

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

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Pós-graduação em Ciência Florestal - FCA

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Pós-graduação em Ciência Florestal - FCA

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A novel m-ary tree based approach is presented to solve asset management decisions which are combinatorial in nature. The approach introduces a new dynamic constraint based control mechanism which is capable of excluding infeasible solutions from the solution space. The approach also provides a solution to the challenges with ordering of assets decisions.

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The high species richness of tropical forests has long been recognized, yet there remains substantial uncertainty regarding the actual number of tropical tree species. Using a pantropical tree inventory database from closed canopy forests, consisting of 657,630 trees belonging to 11,371 species, we use a fitted value of Fisher's alpha and an approximate pantropical stem total to estimate the minimum number of tropical forest tree species to fall between similar to 40,000 and similar to 53,000, i.e., at the high end of previous estimates. Contrary to common assumption, the Indo-Pacific region was found to be as species-rich as the Neotropics, with both regions having a minimum of similar to 19,000-25,000 tree species. Continental Africa is relatively depauperate with a minimum of similar to 4,500-6,000 tree species. Very few species are shared among the African, American, and the Indo-Pacific regions. We provide a methodological framework for estimating species richness in trees that may help refine species richness estimates of tree-dependent taxa.

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Apresenta as contribuições do ex-Deputado e ex-Senador Arthur Virgílio Filho no âmbito do Congresso Nacional. Inclui a sua biografia, atuação política e seus discursos mais significativos.

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Aborda o movimento em favor da representação política para Brasília, apresenta e apoia documento divulgado pela Associação Comercial do Distrito Federal que alinha argumentos em defesa da autonomia política do Distrito Federal com a participação do eleitor brasiliense no processo eleitoral.

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Discurso proferido durante a 1ª Sessão da Câmara dos Deputados na nova capital do país. Ressalta a necessidade de que os discursos na tribuna se refiram ao debate dos grandes problemas do país e à elaboração legislativa de matérias urgentes. Apresenta apelo para que os deputados dirijam à Secretaria da Casa os problemas pessoais que tenham.

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Comenta a realização do I Seminário de Planejamento Governamental para Brasília, que concluiu pela necessidade de uma participação mais direta da população local nas decisões administrativas. Comenta as propostas discutidas no encontro, ressaltando as relativas à representação política para Brasília, a ampliação da área física do Distrito Federal e a criação de região metropolitana. Lê editorial publicado na imprensa brasiliense sob o título "Visão Realista de Brasília", que analisa as palestras proferidas no encontro. Afirma que a falta de representação política tem marginalizado o eleitorado do Distrito Federal.

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v. 1. 1813-1857 -- v. 2. 1857-1866 -- v. 3. 1866-1878