Theory Of Field And Waves
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Theory and computer modelling of Alfvén wave heating in TCABR Tokamak / "Teoria e modelamento computacional de aquecimento de plasma por ondas de alfvén no tokamak TCABR"
In this work we present the study of the determination the best regimes and parameters¶for the heating experiments and current generation and plasma flow in the tokamak TCABR. Study of effects of plasma rotation in low frequency (LF), field penetration, absorption and ponderomotive forces in Tokamak Chauffage Alfvén Brésilien (TCABR)is investigated wi
Publicado em: 2006
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14. Formação de estruturas em cosmologia no regime não-linear: uma aproximação por sistemas dinâmicos
The formation of large scale structure is an outstanding problem in Cosmology. It is a consensus that the observed variety of structures such as galaxies and clusters of galaxies have originated from small fluctuations of the cosmic fluid possibly generated during the inflationary epoch-in the matter dominated era. The early stages of evolution of these fluc
Publicado em: 2006
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15. Aplicação do método LTT às estruturas retangulares e triangulares em multicamadas e empilhadas em substratos PBG para comunicações móveis
Recently the planar antennas have been studied due to their characteristics as well as the advantages that they offers when compared with another types of antennas. In the mobile communications area, the need for this kind of antennas have became each time bigger due to the intense increase of the mobile communications that needs of antennas which operate in
Publicado em: 2005
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16. New theoretical and observational results on transverse magnetic fluctuations near the magnetopause
Electromagnetic ion cyclotron waves in the plasma depletion layer measured by Wind on three inbound passes of the magnetosheath near the stagnation streamline are modeled using theoretical results from Gnavi et al., J. Geophys. Res., 105, 20973, 2000. The kinetic dispersion relation in a plasma composed of electrons, protons, and alpha particles, is solved w
Brazilian Journal of Physics. Publicado em: 2004-12
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17. Surface waves and wave resistance in magnetic fluids
We present here the experimental determination of the dispersion relation of surface waves of a ferrofluid submitted to a steady vertical magnetic field. The results are compared to a linear theory where all the magnetic characteristics of the fluid have been taken into account. The knowledge of the dispersion equation is then used to analyse the capillary-w
Braz. J. Phys.. Publicado em: 2001-09
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18. Ordem e caos em plasmas magnetizados
The objective of this thesis is to present a clear understanding of some important nonlinear phenomena that are common in space and laboratory plasmas. Specifically,the present analytical and numerical studies have focused on the properties of electromagnetic turbulence as well as associated coherent structures and chaotic behaviors in a multi-component magn
Publicado em: 1999
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19. Cordas cosmicas e vortices em relatividade geral : pertubações radiais de soluções estaticas e estacionarias
A linearized theory of the dynamics of small perturbations of certain cylindrically symmetric systems in general relativity is presented. Firstly, we deal with straight, static cosmic strings of finite thickness in the U(l) gauge theory coupled to the Einstein equations. Taking into account the asymptotic behavior of the solution and certain integral ide
Publicado em: 1994
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20. Mistura de ondas ressonante em absorvedores saturaveis
A study of resonant interactions of two or more waves coupled through population modulation in a saturable absorber (SA) is presented. In the case ot two strong, non collinear waves at equal frequencies, the population in the SA is spatially-modulated and the incident waves are scattered into the various orders of the population grating. A non perturbative r
Publicado em: 1984
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21. Geometric visual hallucinations, Euclidean symmetry and the functional architecture of striate cortex.
This paper is concerned with a striking visual experience: that of seeing geometric visual hallucinations. Hallucinatory images were classified by Klüver into four groups called form constants comprising (i) gratings, lattices, fretworks, filigrees, honeycombs and chequer-boards, (ii) cobwebs, (iii) tunnels, funnels, alleys, cones and vessels, and (iv) spir