192 resultados para Turbulência quântica
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Física - FEG
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Pós-graduação em Ciência e Tecnologia de Materiais - FC
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This work aims to examine, the behavior of a combustion chamber in pilot scale, coupled to a regenerative burner. The objective is to obtain a computational domain capable of supporting a simulation of conventional combustion and flameless combustion regimes. The objective is to obtain independence of mesh, analysis of the velocity fields of the fluid within the chamber, temperature and concentration profiles of the species emitted during the combustion process
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A protonterapia é um tipo de tratamento promissor quanto a diminuição de dose nos tecidos adjacentes ao tumor, devido às suas característica de deposição de energia ao interagir com a matéria. Para aumentar a acurácia do tratamento é necessário que as simulações sejam feitas a partir de um sistema de formação de imagem que utilize também um feixe de prótons, como a tomografia por feixe de prótons (pCT). Essa área atualmente está em desenvolvimento e se defronta com inúmeros problemas na formação de uma imagem precisa. Este trabalho tem o intuito de analisar a viabilidade de simulações computacionais para este tipo de feixe. O código computacional SRIM é um conjunto de programas que calcula o freamento e o alcance de íons ao interagir com a matéria. Esse cálculo baseia-se em ferramentas oriundas da mecânica quântica e também no método de Monte Carlo, para determinar, de modo probabilístico, trajetórias, colisões e ângulos. Foram realizadas simulações no programa SRIM para um alvo heterogêneo envolvendo água e osso cortical. Para analisar o comportamento do feixe transmitido, foram feitas alterações na posição e no tamanho da heterogeneidade. A partir dos dados obtidos pode-se obter valores médios, histogramas e gaussianas dos mesmos para cada simulação e tirar conclusões sobre a viabilidade e as dependências desse tipo de simulação
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This work research and analyses the formulations and concepts of heat and temperature presented in Physics textbooks. These issues are deemed important because students often have difficulties differentiating and understanding such concepts, which compromises their education. The goal is to show that well-established relationships between Physical quantities such as energy, pressure, heat and temperature, even in different theories of Classical and Quantum Physics are not enough to define either temperature or heat. It also presents simple experiments that complement the teaching and learning of these concepts
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The present work has as its goal to treat well known and interesting unidimensional cases from quantum mechanics through an unusual approach within this eld of physics. The operational method of Laplace transform, in spite of its use by Erwin Schrödinger in 1926 when treating the radial equation for the hydrogen atom, turned out to be forgotten for decades. However, the method has gained attention again for its use as a powerful tool from mathematical physics applied to the quantum mechanics, appearing in recent works. The method is specially suitable to the approach of cases where we have potential functions with even parity, because this implies in eigenfunctions with de ned parity, and since the domain of this transform ranges from 0 to ∞, it su ces that we nd the eigenfunction in the positive semi axis and, with the boundary conditions imposed over the eigenfunction at the origin plus the continuity (discontinuity) of the eigenfunction and its derivative, we make the odd, even or both parity extensions so we can get the eigenfunction along all the axis. Factoring the eigenfunction behavior at in nity and origin, we take the due care with the points that might bring us problems in the later steps of the solving process, thus we can manipulate the Schrödinger's Equation regardless of time, so that way we make it convenient to the application of Laplace transform. The Chapter 3 shows the methodology that must be followed in order to search for the solutions to each problem
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Since the priors, man has been trying to understand the concept of time. From myth to quantum physics, time is something that inspires reflections on our own lives. Do we exist in time or for time? Literature, a peculiar form of knowledge, deals with the experience of time in many ways. By avoiding categorizations, literature converges time and space in a dimension in which labyrinth and compass converge: at the reading time, in the reader’s space, in the universe of the book, where Cronos, Kairos, and their heir, by excellence, the literary word, constellate. In this way, in this essay, I discuss some aspects of the relationship between literature and time, or still, what literature can teach us about the time.
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Na literatura da área de Ensino de Física encontramos diversos argumentos em defesa da inclusão, nos currículos escolares do Ensino Médio, de conteúdos de Física Moderna e Contemporânea. A Teoria da Relatividade Especial e Geral (ao lado da Mecânica Quântica) é um dos pilares da Física Moderna. Consideramos significativo e oportuno obter um panorama da produção acadêmica sobre o ensino e aprendizagem deste tópico. Nosso objetivo é sintetizar os avanços, as convergências e sinalizar perspectivas, com o intuito de contribuir para um avanço e defesa dos trabalhos futuros. Assim, procuramos resposta para a questão: Quais as contribuições da pesquisa em Ensino de Física para que a Teoria da Relatividade Especial e Geral (TREG) possa ser abordada no Ensino Médio?
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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This article analyzes the results of three different field research, carried out simultaneously in small technology-based sectors, metal-mechanical industry and hotel in the city of São Carlos - SP, with goals, concepts and methods of similar research. The studies were classified as quantitative and descriptive and conducted through a survey of opinion with the main leader of the company. It were considered valid for analyses, the responses of 57 leaders, it were 33 technology-based sector, 13 of the metal-mechanic industry and 11 in the hospitality sector. The main results: the formalization of planning has not led to better performance, considering the indicator growth in sales in the three sectors studied and that the degree of formalization of the planning of the companies in the technologybased sector was higher, while the hospitality sector had a percentage smaller. The dynamic aspect of technology-based sector and stability in the hotel sector in the region studied, leads to assume that the turbulence of the environment is a predominant factor, contradicting the proposal of some authors, in which the formal planning is inappropriate for small companies that operate in environments that change quickly.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Física - FEG
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)