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Mostrando ítems 31-40 de 130
Turbulência de Ondas em condensados de Bose-Einstein
(Universidade Federal de São Carlos, 2018-02-19)
In this work we used as a starting point the theory developed by Zakharov and Nazarenko for treating wave turbulence in systems
with weak non linearity such as atomic Bose-Einstein condensates with low enough temperature ...
Resposta óptica de sistemas atômicos no espaço livre ou aprisionados dentro de cavidades ópticas no regime de armadilhamento coerente de populações
(Universidade Federal de São Carlos, 2018-02-28)
The aim of this work is to study the electromagnetically induced transparency (EIT) and
the coherent population trapping (CPT) phenomena in three-level systems, such as atoms
and quantum dot molecules (QDM). The present ...
Técnicas de difração de elétrons e de caracterizações elétricas e térmicas combinadas para análise de transformações de simetria em estruturas perovskitas distorcidas : caso das soluções sólidas (Pb1-xCax)TiO3
(Universidade Federal de São Carlos, 2017-03-03)
The main objective of this work was the unequivocally determination of the crystal symmetry
of distorted perovskite structure by direct and indirect methods, with the solid solution system
Pb1-xCaxTiO3 (PCT) as the case ...
Emaranhamento intrínseco em sistemas tipo-Dirac
(Universidade Federal de São Carlos, 2018-03-06)
Dirac equation is supported by a $SU(2) \otimes SU(2)$ group structure, such that its solutions describe two discrete degrees of freedom, intrinsic parity and spin, which in general are entangled. In this work we will ...
Termodinâmica de buracos negros de Schwarzschild
(Universidade Federal de São Carlos, 2018-05-28)
This dissertation consists of a review about some aspects of Schwarzschild black hole thermodynamics and includes a discussion related to the temporal evolution of the masses of these black holes in a thermodynamic context. ...
Estudos de vidros fluoroboratos e fluorogermanatos de chumbo, através de técnicas de espectroscopia óptica e de ressonância magnética
(Universidade Federal de São Carlos, 2018-12-04)
In this work two studies on rare earth−doped (Eu3+, Yb3+) lead fluorogermanate (GeO2−PbO−PbF2) and fluoroborate glasses (B2O3 −PbO −PbF2) were investigated. The main advantages of these glasses are their chemical stability ...
Influência do tamanho médio de grão nas propriedades ferroicas de compósitos magnetoelétricos particulados
(Universidade Federal de São Carlos, 2016-04-08)
In the case of composites materials, which presents the magnetoelectric coupling,
there are so many questions about the influence of the microstructure on the coupled
and uncoupled properties. Thereby, this work proposes ...
Matrizes de reflexão com simetria 𝒰𝑞 [osp(2|2𝑚)(2)]
(Universidade Federal de São Carlos, 2012-03-16)
In this thesis we present solutions of the graded boundary YANG-BAXTER equations for vertex models with 𝒰𝑞 [osp(2|2𝑚)(2)] symmethy.
Investigação das propriedades magnetoelásticas da ferrita de níquel : análise teórico-experimental
(Universidade Federal de São Carlos, 2018-02-21)
In this dissertation, we investigate the magnetoelastic properties of nickel ferrite compared
to the pure metal nickel, either by ab-initio calculation or through experiments using the
capactive cell technique. The first ...
Estudo das propriedades estruturais, elétricas e ópticas de filmes finos de Niobato de Sódio e Potássio (KNN), fabricados por deposição a laser pulsado (PLD)
(Universidade Federal de São Carlos, 2017-05-05)
Environmental problems arising from lead toxicity in materials, such as those in lead zirconate titanate (PZT) have stimulate the search for new lead-free ferroelectrics materials with ferroelectric and piezoelectric ...