Scattering Theory
Mostrando 25-36 de 113 artigos, teses e dissertações.
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25. Desenvolvimento de metodologias para o estudo do efeito Raman normal e ressonante utilizando modelos Ab initio dependentes do tempo / Development of methodologies for the study of normal and resonance Raman effect using Ab initio time-dependent models
In this work new methodologies for the calculation of absolute vibrational Raman intensities of gaseous systems are presented. In order to reduce the computational requirements in these calculations two families of compact basis functions were generated from the effective core potential valence basis sets SBKJC and Stuttgart-Cologne through the Sadlej s elec
Publicado em: 2009
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26. Filmes compositos de fosfato de aluminio e latex : morfologia e propriedades oticas / Aluminum phosphate latex composite films : morphology and optical properties
A morfologia de filmes compósitos preparados com fosfato de alumínio e látexes de poli(metacrilato de metila-co-acrilato de butila) e de poli(estireno-co-acrilato de butila) foi caracterizada por técnicas de microscopia eletrônica de transmissão e de varredura (TEM, SEM) e por técnicas de microscopia de varredura por sonda (AFM, DPFM). O grau de opaci
Publicado em: 2009
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27. The role of crossing symmetry for a low energy pion-nucleon scattering from dispersive method
The slow convergence of chiral perturbation theory for heavy baryons (HBChPT) suggests that any attempt to unitarize the amplitude following from this method will fail to describe the experimental phase shifts. However, it was possible to obtain a ChPT pion nucleon amplitudes respecting exact unitarity relation by using the Inverse Amplitude Method (IAM), bu
Brazilian Journal of Physics. Publicado em: 2008-09
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28. Espalhamento de raios-X a baixo ângulo aplicado ao estudo estrutural de proteínas / Small Angle X ray Scattering applied to protein characterization studies
Small angle X-ray scattering has been proven to be a powerful tool in the structural analysis of proteins in solution. This technique permits the three-dimensional visualization of native proteins envelop at the level of nanometers. In this study we discuss the small angle X-ray scattering theory and we proposed a new methodology to determine the molecular w
Publicado em: 2008
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29. Excesso de ruído no oscilador paramétrico ótico / Excess noise in optical parametric oscillator
In spite of the fact that the Optical Parametric Oscillator (OPO) is one of the most known experiments related with quantum information research, its experimental results did not have a good agreement with the theory, in the above threshold regime, because of an unexpected excess noise in the phase quadrature on its beams. In this work we sistematicaly prese
Publicado em: 2008
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30. Radiative transfer model for regular and discontinuous canopies (GRART): application in tree coffee canopies / Modelo de transferência radiativa para dosséis descontínuos regulares (GRART): aplicação para dosséis de café
Regularly displaced discontinuous plant stands such as coffee tree stands, citrus orchards, eucalyptus forests and annual crops at the beginning of their phenological cycle (row structured) are known as highly anisotropic remote sensing targets. Operational parameter estimate upon this kind of remote sensing targets requires a physically-based canopy reflect
Publicado em: 2008
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31. Espectroscopia Ãptica nÃo linear de vidros especiais e colÃides
Nonlinear optical properties of special glasses and colloids were studied using the zscan technique. This technique aalows to calculate the nonlinear refraction index and the nonlinear absorption coefficient using the self-focusing or defocusing effect that appears when the incident laser pass through a nonlinear medium. Orthophosphate and polyphosphate anti
Publicado em: 2008
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32. On model-independent analyses of elastic hadron scattering
By means of an almost model-independent parametrization for the elastic hadron-hadron amplitude, as a function of the energy and the momentum transfer, we obtain good descriptions of the physical quantities that characterize elastic proton-proton and antiproton-proton scattering (total cross section, r parameter and differential cross section). The parametri
Brazilian Journal of Physics. Publicado em: 2007-07
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33. NLO QCD corrections to inclusive jet and hadron production in DIS
We analyze the order alphas² corrections to the single inclusive jet and hadron cross sections in lepton-nucleon deep inelastic scattering. The full calculations are done analytically, obtaining finite NLO partonic level cross sections for these processes. We show that in both cases the dominant partonic mechanism starts at order alphas², being effectively
Brazilian Journal of Physics. Publicado em: 2007-07
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34. Multiple scattering theory for pion-nucleus elastic scattering and the in-medium piN amplitude
Elastic scattering of positive and/or negative pions (pi+ and/or pi-) by nuclei has been studied by means of Glauber's multiple scattering theory (GMST). The differential, total and total elastic cross sections using both the full series expansion and the first order correction (called optical limit results, OLA) of the Glauber amplitude, have been calculate
Brazilian Journal of Physics. Publicado em: 2007-06
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35. Inverse problem of approximated analytical reconstruction of the solution for the equation of monoenergetic neutral particle transport in cartesian unidimensional geometry with isotropic scattering / Problema inverso de reconstrução analítica aproximada da solução da equação de transporte de partículas neutras monoenergéticas em geometria unidimensional cartesiana com espalhamento isotrópico
Nesta tese mostraremos uma aplicação do método SGF, cf., spectral Greens function, para gerar fluxos angulares nas interfaces dos nodos na formulação de ordenadas discretas (SN) para equação de transporte de partículas neutras em geometria cartesiana unidimensional e a uma velocidade, usando quadraturas de alta ordem. Utilizando o método de malha gr
Publicado em: 2007
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36. Teoria de espalhamento em variedades assintoticamente hiperbÃlicas
Nesta DissertaÃÃo de mestrado descrevemos aspectos da Teoria clÃssica dos operadores pseudodiferenciais, apresentando suas definiÃÃes bÃsicas e o cÃlculo pseudodiferencial clÃssico. Em seguida introduzimos as variedades assintoticamente hiperbÃlicas, e damos importantes resultados obtidos por R. Melrose e R. Mazzeo sobre extensÃes meromorfas do res
Publicado em: 2006