Dissertações em Física (Mestrado) - PPGF/UNICAMP
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/9736
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Item Acesso aberto (Open Access) Processos de relaxação em sistemas longe do equilíbrio termodinâmico(Universidade Estadual de Campinas, 1985-08-16) MACHADO, Carlos José Freire; VASCONCELLOS, Aurea Rosas; http://lattes.cnpq.br/0475932786473160Item Acesso aberto (Open Access) Relações de dispersão derivativas e amplitudes elementares em interações hadrônicas e altas energias(Universidade Estadual de Campinas, 1998-10-30) SILVA NETO, Manoel Januário da; MENON, Marcio José; http://lattes.cnpq.br/2904099489779348The Glauber multiple diffraction formalism connects the hadronic elastic scattering amplitude (hadron-hadron interactions) with the elementary scattering amplitude (constituent-constituent ). In this thesis the central point is a first investigation on the applicability of the derivative dispersion relations in the determination of the real part of the elementary amplitude, from suitable parametrizations for its imaginary part. With this approach, in the context of a phenomenological model previously developed, a satisfactory description of the physical quantities that characterize the elastic hadron scattering is achived, namely, the differential cross section, the total cross section and the r parameter (the ratio of the forward real and imaginary parts of the hadronic amplitude ). It is also presented a critical discussion concerning the model previously developed and, in some detail, a review of the multiple diffraction formalism and how to deduce the derivative dispersion relations from the integral ones, in the high energy region.Item Acesso aberto (Open Access) Estudo por espectroscopia Raman da desidratação e reidratação do clorato de bário monohidratado Ba (ClO3) 2 H2O(Universidade Estadual de Campinas, 1977-07-15) CANCELA, Luiz Sérgio Guimarães; VARGAS, Helion; http://lattes.cnpq.br/1898007894731106Item Acesso aberto (Open Access) Estudo cristalográfico da deformação plástica em monocristais de cobre(Universidade Estadual de Campinas, 1977-07-15) GOMES, José de Ribamar Seguins; MEDRANO, Ricardo EnriquePrevious results in Aluminum have show that the Critical Resolved Shear Stress is not the same for different slip system when flat single crystals are deformed. This is consequence either different stress is necessary to move edge screw dislocation or surface effect (aluminum have a oxide layer attached). In the present work similar analysis have been done in copper. Flat single crystals of special orientation have beem grown Under inert atmosphere in a graphite mould. The slip system is determined by following the tensile orientation with this purpose a deformation frame is attached to the X-Rays difractomer and movement of the tensile axis is measured by using the LAUE technique. It is found similar results than in aluminum which means that differences in flow stress are mainly tested to dislocations.