Wave Excitation
Mostrando 25-36 de 94 artigos, teses e dissertações.
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25. The analysis of Alfvén wave antenna implementation in the ETE spherical tokamak
The preliminary design study of the Alfvén wave system for the ETE spherical tokamak is presented. The main objective of the proposed RF system is generation of travelling Alfvén waves, which can be used for the study of the non-inductive current drive and the plasma heating in a wide range of operational regimes, which are specific for tokamaks with small
Brazilian Journal of Physics. Publicado em: 2004-12
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26. Analysis of the nuclear fusion process based on potential barriers modified by coupling effects
Partial wave analysis and the decoupling of the wave equations based on potential barriers modifi ed by coupling effects are applied in the study of the fusion process in medium heavy nuclei. Several relevant physical quantities are calculated in order to provide evidence of underline reaction mechanisms that determine characteristics of fusion excitation fu
Brazilian Journal of Physics. Publicado em: 2004-09
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27. Coulomb nuclear interference with deuterons in even palladium isotopes
Angular distributions for the inelastic scattering of 13.0 MeV deuterons on 104;106;108;110Pd were measured with the Sao Paulo Pelletron-Enge-Spectrograph facility in the range of 12(0) < thetalab < 64(0). A Coulomb-Nuclear Interference analysis, employing the Distorted Wave Born Approximation with the Deformed Optical Model as transition potential, under we
Brazilian Journal of Physics. Publicado em: 2004-09
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28. Considerations on undistorted-progressive X-waves and Davydov solitons, Fröhlich-Bose-Einstein condensation, and Cherenkov-like effect in biosystems
Research in ultrasonography has evidenced the propagation of a peculiar kind of excitation in fluids. Such excitation, dubbed a X-wave, has characteristics resembling that of a solitary-wave type. We reconsider the problem in a medium consisting of a biological material of the like of alpha-helix proteins. It can be shown that in this case is expected an exc
Brazilian Journal of Physics. Publicado em: 2004-06
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29. Estudo e Aperfeiçoamento do Vocoder de Transformada Senoidal
The basic sinusoidal analysis/synthesis system is presented and recent parameters codification techniques are studied. In addition, new methods for improving the speech quality of Sinusoidal Transform Vocoders at 2,4 and 4,8 Kbps are presented. One of them is a refinement in the pitch estimation, since pitch accuracy is essential for the efficiency of the ha
Publicado em: 2004
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30. {Kinetic simulations to modeling events in space plasmas} / Simulação cinéticas para modelagens de fenômenos em plasma espaciais
- The purpose of this doctoral thesis is to study some phenomena in space plasma using theoretical models and computer simulation via particles. Firstly, we concentrate on studying the process involving nonlinear interactions among Langmuir, electromagnetic and ion acoustic waves, associated with type III solar radio bursts. Starting from the generalized Zak
Publicado em: 2004
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31. Estudo do efeito da correlação do alvo no espalhamento de elétrons por moléculas pequenas na faixa de energias baixas e intermediária.
In this present work, we have carried out a theoretical investigation on the influence of the target electronic correlation on electron elastic scattering by molecules. Calculated differential, integral and momentum-transfer cross sections on electron elastic scattering by nitrous oxide (N2O) and carbon dioxide (CO2), in low energy range (0.1-20 eV), and car
Publicado em: 2004
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32. Study of optical properties of crystalline fibers of CVO:nd3+ and CMO: nd3+/nb5+ / Estudo das propriedades ópticas de fibras cristalinas de CVO:Nd3+ e CMO:Nd3+/Nb5
The present work release an extensive study of spectroscopic properties on CMO:NdNbO4 and CVO:Nd3+ single crystal fibers, in searching for new laser materials activated with diode laser. The fibers were grown by LHPG (laser Heated Pedestal Growth) technique that permits a fast production of fibers with appropriate dimension for mini laser construction, witho
Publicado em: 2003
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33. Modelagem matemática do comportamento mecânico do detector de ondas gravitacionais "Mario Schenberg" / A mathematical model for the mechanical behavior of Mario Schenberg gravitational wave detector
O objetivo principal deste trabalho é modelar matematicamente o comportamento mecânico do detector de ondas gravitacionais Mario Schenberg. São estudados os parâmetros físicos que afetam este comportamento. O modelo prevê as frequências de ressonância do sistema, quando são acoplados ressonadores mecânicos unidimensionais de dois modos, obedecendo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2002
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34. The role of alpha particles in the emission of plasma waves inside solar ejecta
The enhancement of the resonant instability of right-hand polarized electromagnetic ion cyclotron waves by alpha particles for physical parameters corresponding to coronal mass ejections is studied. We focus on the effects of alpha thermal anisotropy and relative He++/H+ abundance on growth and absorption rates. The first parameter governs directly wave emis
Brazilian Journal of Physics. Publicado em: 2002-06
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35. Response of Grilage-Like Structures by the Mobility Approach
This work presents an application of the Mobility Approach to the analysis of the power flow through grillage-like structures. Such structures are usually found in offshore platforms, supporting large and heavy machines. Different wave kinds (longitudinal, flexural and torsional) were initially considered in the power flow analysis between two beams joined i
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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36. Analise numerica e experimental de fluxo de energia em estruturas
This work deals with the theoretical, numerical and experimental aspects of energy flow in structures. The mathematical formulation for computation of power flow maps is presented for beams (Euler-Bernoulli and Timoshenko) and plates (Kirchhoff and Mindlin) The physical meaning of active and reactive power is discussed. The reactive intensity is related with
Publicado em: 2001