Tori
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Bibliotecas virtuais/digitais :suas ferramentase contribuições na educação superior - o caso da PUCPR
Com o presente estudo pretende-se identificar as contribuições que a Biblioteca Virtual/Digital traz ao processo ensino-aprendizagem na Pontifícia Universidade Católica do Paraná - PUCPR. Buscando na literatura científica informações sobre este tipo de biblioteca a fim de estabelecer parâmetros de comparação com o cenário atual da Biblioteca Virt
Publicado em: 2008
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14. Galerkin-method approach to nonlinear soliton classical stability
We examine the evolution of perturbations on the kink configuration in l f4 theory and of the Nielsen-Olesen vortex in scalar electrodynamics through the Galerkin method. The problem is reduced to a finite dynamical system for which the linear and nonlinear regimes are studied. The linear stability of both is associated to a motion i
Brazilian Journal of Physics. Publicado em: 2007-06
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15. From binary codes to lattices and spherical codes / De codigos binarios a reticulados e codigos esfericos
In this work it is presented through examples a connection between inary codes, lattices and spherical codes. A brief introduction to coding theory, properties and examples is included in the first chapter. In Chapter 2 lattices are approached with focus on the quotient of lattices, graphs on flat tori and connections with circulant graphs. An introduction t
Publicado em: 2007
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16. As relações entre as características antropométricas e a eficiência na realização de técnicas de mão, quadril e perna no judô / The relationships between the antropometrics characteristics and efficiency in the accomplishment of techniques of hand, hip and leg in the judo
Este estudo descreve as relações entre as características antropométricas e a eficiência na realização de técnicas de mão, quadril e perna no Judô. Para tanto, foram analisadas através de cinemetria, três judocas da Grande Florianópolis com características antropométricas diferentes para a estatura, que foram projetados por um mesmo judoca de
Publicado em: 2007
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17. Spherical codes with cyclic symmetries / Codigos esfericos com simetrias ciclicas
Euclidean spherical codes with symmetries are orbits of finite orthogonal matrix groups. These codes are also known as group codes. ln this work, the commutative group codes in even dimensions are viewed on flat tori, which are submanifolds of the sphere. Also, if the matrix group is cyclic, the generated code lies on a knot which wraps around a torus. If th
Publicado em: 2006
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18. Nonlinear resonance in bouncing universes
The dynamics of closed LFRW universes with a massive inflaton field is examined where Friedmann equations are corrected by the introduction of a potential term arising from quantum gravity corrections to cosmological scenarios near the singularity. This extra term implements nonsingular bounces in the early evolution of the universe. For certain windows in t
Brazilian Journal of Physics. Publicado em: 2005-12
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19. A relation between the right triangle and circular tori with constant mean curvature in the unit 3-sphere
Neste artigo mostraremos que a imagem inversa pela projeção estereográfica de um toro circular de revolução no espaço euclidiano de dimensão 3 tem curvatura média constante se e somente se os seus raios são o cateto e a hipotenusa de um triângulo retângulo apropriado.
Anais da Academia Brasileira de Ciências. Publicado em: 2004-12
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20. On reconnection phenomena in the standard nontwist map
Separatrix reconnection in the standard nontwist map is described, including exact methods for determining the reconnection threshold in parameter space. These methods are implemented numerically for the case of oddperiod orbit reconnection, where meanders (invariant tori that are not graphs) appear. Nested meander structure is numerically demonstrated, and
Brazilian Journal of Physics. Publicado em: 2004-12
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21. Spherical tokamak development in Brazil
This paper describes the general characteristics of spherical tokamaks, or spherical tori, with a brief overview of work in this area already performed or in progress at several institutions worldwide. The paper presents also the steps in the development of the ETE (Experimento Tokamak Esférico) project, its research program, technical characteristics and o
Brazilian Journal of Physics. Publicado em: 2003-12
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22. Symplectic integrators revisited
This paper is a survey on Symplectic Integrator Algorithms (SIA): numerical integrators designed for Hamiltonian systems. As it is well known, n degrees of freedom Hamiltonian systems have an important property: their ows preserve not only the total volume of the phase space, which is only one of the Poincaré invariants, but also the volume of sub-spaces le
Brazilian Journal of Physics. Publicado em: 2002-12
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23. Aplicações harmonicas, estruturas-f, toros e superficies de Riemann nas variedades homogeneas
In this work we study the geometry of invariant f-structures and f-holomorphic curves on flag manifolds, and the construction of the equiharmonic tori on full complex flag manifolds which are not f-holomophic for any invariant f-estructure. Moreover we relate the tournament theory with the almost-complex on a flag manifolds. We compute the second variation o
Publicado em: 2002
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24. Emaranhamento e caos em um sistema de dois spins
In this project we have studied a two spin system under an anisotropic Heisenberg interaction and external magnetic fields acting on each spin separately. We have been able to relate fast decoherence of a quantum subsystem with the presence of chaos in the corresponding classical system. Such an association has been done making use of the coherent state repr
Publicado em: 2002