Orbits
Mostrando 25-36 de 185 artigos, teses e dissertações.
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25. Color Doppler imaging of the superior ophthalmic vein in patients with Graves' orbitopathy before and after treatment of congestive disease
OBJECTIVE: To compare superior ophthalmic vein blood flow parameters measured with color Doppler imaging in patients with congestive Graves' orbitopathy before and after treatment and in normal controls. METHODS: Twenty-two orbits from 12 patients with Graves' orbitopathy in the congestive stage and 32 orbits from 16 normal controls underwent color Doppler i
Clinics. Publicado em: 2011
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26. Equações diferenciais : reversibilidade e bifurcações / Differential equations : reversibility and bifurcations
Na primeira parte desta tese, estudamos a semelhança entre sistemas dinâmicos reversíveis e Hamiltonianos, sob um ponto de vista formal. Nos restringimos a sistemas definidos ao redor de pontos de equilíbrio simples e simétricos. Mostramos que, sob algumas hipóteses, tais sistemas são formalmente orbitalmente equivalentes. Na segunda parte, estudamos
Publicado em: 2011
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27. Propriedades de dinâmica hamiltoniana em níveis de energia convexos de R4 / Properties of the hamiltonian dynamics in convex energy levels of R4
The existence of global surfaces of section to ows is of central importance in the theory of dynamical systems, as a global surface of section simplies the study of the dynamics of a ow reducing it to the study of the dynamics of a dieomorphism. We present in detail the construction due to Hofer, Wysocki and Zehnder (in The dynamics on a strictly convex ener
Publicado em: 2011
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28. The algorithmic weak stability boundary in earth-to-moon mission design: dynamical aspects and applicability.
This thesis consists of an extensive study of the Weak Stability Boundary (WSB) concept in low-energy Earth-to-Moon mission design within the mathematical structure provided by the Planar Circular Restricted Three-Body Problem (PCR3BP). By employing the patched three-body approach to approximate the Sun-Earth-Moon-spacecraft system, we examine and characteri
Publicado em: 2011
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29. Evolução da excentricidade dos sistemas binários com componente evoluída
On this study we have revisited the predicted tidal circularization theory in close binary systems with a evolved component. Close binaries suffer tidal interactions that tend to synchronize periods and circularize the orbits (Zahn 1977, 1989, 1992). According to Zahns theory we compute the integral that give us the variation of the eccentricity in a binary
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/12/2010
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30. Development of access-based metrics for site location of ground segment in LEO missions
Abstract: The classical metrics of ground segment site location do not take account of the pattern of ground segment access to the satellite. In this paper, based on the pattern of access between the ground segment and the satellite, two metrics for site location of ground segments in Low Earth Orbits (LEO) missions were developed. The two developed access-b
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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31. About 3-manifolds supporting some actions of R POT. 2and a Morses conjecture / Sobre 3-variedades suportando certas ações de R POT. 2e uma Conjectura de Morse
First we consider a family of C POT. 2actions of R POT. 2on a closed 3-manifold. One of the conditions of this family is that it admits only a finite number of singular orbits, which are all diffeomorphic to circle. For this family we will give a description of the structure of the orbits as well the 3-manifolds supporting this actions. This generalizes resu
Publicado em: 2010
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32. Sistemas dinamicos em espaços metricos fuzzy : aplicações em biomatematica / Dynamical systems in fuzzy metric spaces : applications in biomathematics
Neste trabalho desenvolvemos ferramentas de análise qualitativa para sistemas dinâmicos definidos sobre o espaço formado pelos conjuntos fuzzy com a níveis compactos e não vazios. São propostas condições para existência de pontos de equilíbrio para o fluxo fuzzy cuja função de pertinência é sobrejetiva, generalizando alguns resultados já conhe
Publicado em: 2010
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33. Análise de geometrias com curvas fechadas no tempo / Analysis of Geometries with Closed Timelike Curves.
This work deals with the analysis of cylindrically symmetric and stationary space-times Ct with closed timelike curves. The equation of motion describing the evolution of a massive scalar field in a Ct space-time is obtained. A class of space-times with closed timelike curves describing cosmic strings and cylinders is studied in detail. In such space-times,
Publicado em: 2010
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34. Matrizes de conexão para as dinamicas continua e discreta / Connectiion matrices for the continuous and discrete dynamics
The goal of this work is to present the connection matrix by establishing a parallel between the continuous and discrete settings. The homological Conley index, the main element in the definition of the connection matrix, has a diferent form for flows or continuous maps. This index is a graded vector space in the continuous case whereas in the discrete case
Publicado em: 2010
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35. Microlasers de cavidades estadio aplicados a detecção nanovolumetrica / Stadium cavities microlasers applied to the nanovolumetric detection
This work presents the development of resonant cavities based on chaotic billiard geometries built with semiconductor active optical medium for sensing applications. In spite of the classically chaotic behavior of the stadium, the quantum description of the problem in the semi-classical limit shows unexpected accumulations of the density of probability on cl
Publicado em: 2010
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36. Desenvolvimento de uma metodologia para a estimativa de biomassa e de carbono em sistemas agroflorestais por meio de imagens orbitais / Development of a methodology to the estimation of biomass and of carbon in agroforestry systems for middle of orbits
Remarks indicate that naturals systems of the Earth are being affected for transformation about the ability of diverse region. Within the causes these changes, detach the emission of CO2 (Carbon Dioxide) way alteration in land use and land cover. The Amazonian region, in function of the occupation trajectory has received attention of the scientific community
Publicado em: 2010