Mathematical Physics
Mostrando 37-48 de 85 artigos, teses e dissertações.
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37. Organização de episodios de ensino sobre a "questão nuclear" para o ensino medio : foco no imaginario de licenciados / Production of theach episodes above "nuclear question" for high school : focus in the future of physics teacher imaginary
In this dissertation, we are attempting to understand the under-degree physics student?s imaginary related to the inclusion of Modern and Contemporary Physics in high school. A class of future Physics teachers was monitored during the discipline Practice of Physics Teaching and Supervised Internship in the first half of 2005, at the Education Faculty of the
Publicado em: 2008
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38. A equação de Lane-Emden-Fowler em teoria classica de campos e astrofisica estelar / The Lane-Emden-Fowler equation in classical field theory and stellar astrophysics
Neste trabalho buscamos soluções exatas não-triviais da Equação de LaneEmden-Fowler. Esta equação tem aplicações importantes em Teoria de Campos não-linear, bem como em Astrofísica Estelar. Inicialmente, a partir do formalismo da Integral Primeira, obtemos soluções para um modelo >.~n+1 com n = 2,3,5, utilizando Integrais Elípticas de Jacobi. S
Publicado em: 2008
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39. Saddle point systems with an application to the acceleration of the Augmented Lagrangian / Sistemas ponto de sela com uma aplicação a aceleração do Lagrangiano Aumentado
Saddle point systems arise in wide areas of research fields like physics, chemistry and engineering and images reconstructions, etc. Then, the properties of these systems and solving methods have been subjects of intense study in the last years. Depending upon the system properties, several methods were developed; some of these, exhibit the property of prese
Publicado em: 2008
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40. A constraint-based model to support electronic TV network design
Electronic Television Network Design is well established when electronic physics concepts and computer techniques joint trough mathematical equations and geometrics concepts, to represent real effects. Even though, the two fields have significant different concepts. This research has as objective to propose one approach constraint-based data model, to suppor
Publicado em: 2008
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41. Desenvolvimento de um sistema on-line para a avaliação de doses fetais em radiologia diagnóstica / Development of on line system for the evaluation of fetal doses in diagnostic radilogy
In this work, an online system called Dose Fetal Web was developed for the evaluation of fetal doses in diagnostic radiology. The methodology used in this system estimates the fetal dose from data related to radiologic diagnostic examinations of a pregnant patient, or from the routine individual monitoring dosimetry of a pregnant worker. The input data of th
Publicado em: 2008
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42. Comparison of turbulent particle dispersion models in turbulent shear flows
This work compares the performance of two Lagrangian turbulent particle dispersion models: the standard model (e.g., that presented in Sommerfeld et al. (1993)), in which the fluctuating fluid velocity experienced by the particle is composed of two components, one correlated with the previous time step and a second one randomly sampled from a Wiener process,
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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43. Study of the (2+1)D noncommutative supersymmetric CP^(N-1) model with the basic field in the fundamental representation. / Estudo do modelo CPN-1em (2+1)D não comutativo supersimétrico com o campo básico na representação fundamental
Nesta tese estudamos o modelo CP^(N-1) em (2+1) dimensões do espaco-tempo, onde o campo básico está na representacão fundamental. Diferentemente do caso em que o campo básico está na representacão adjunta, já estudado na literatura, o modelo por nós estudado se reduz ao modelo supersimétrico usual no limite comutativo. Analisamos a estrutura de fas
Publicado em: 2007
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44. Desenvolvimento e validação de um modelo conceitual de aeração em vertedores. / Development and validation of a conceptual model of aeration in spillways.
This study adress prompt aeration in spillways reaching to reduce the cavitation effects on them. References were based on introduction to cavitation machanism and, state of art survey, to leave on not only earlier studies, but also on classical and most recent ones. Based on principles of Physics, such as Mass Conservation and the First Law of Thermodynamic
Publicado em: 2007
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45. Numerical simulations of the gravitational collapse of a massless scalar field / Simulações numericas do colapso gravitacional de um campo escalar sem massa
Esta dissertação trata de um problema de colapso gravitacional do campo escalar sem massa com simetria esférica, de acordo com as equações de Einstein com acoplamento mínimo. Desenvolvemos algoritmos simples mas com ajuste automático de refinamento para obter soluções numéricas. O refinamento é necessário para descrever os fenômenos do colapso.
Publicado em: 2007
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46. Desenvolvimento de um simulador para problemas multi-fÃsicas
Simulation of coupled natural phenomena, such as the evolution of material damage due to mechanical and chemical loads, are becoming more and more important in the engineering pratice. This was influenced by the growth of Computational Mechanics software industry. Despite the computational advance, it still applies software engiheering development techniques
Publicado em: 2007
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47. Methods for transport equations with random data / Metodos para equações do transporte com dados aleatorios
Mathematical models for real-world processes often take the form of systems of artial differential equations. Such models usually involve certain parameters, for example, the coefficients in the differential operator, and the initial and boundary conditions. Usually, all the model parameters are assumed to be known exactly. However, in realistic situations m
Publicado em: 2007
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48. Local and global symmetries in gauge theories / Simetrias globais e locais em teorias de calibre
This thesis deals with the geometric formulation of classical gauge theories, or Yang-Mills theories, regarded as an important class of models that must be included in any attempt to establish a general mathematical framework for classical field theory. Such a formulation must come in (at least) two variants: the hamiltonian version which has gone through a
Publicado em: 2007