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Processamento e propriedades do sistema ferroelétrico livre de chumbo (Bi, Na)TiO3 (Bi, K)TiO3 BaTiO3
(Universidade Federal de São Carlos, 2015-03-09)
In this work, the lead-free ceramic powders of xBi0,5Na0,5TiO3 - (0,7186 - 0,7143x) Bi0,5K0,5TiO3 - (2814 - 2857x) BaTiO with x = 0,8200; 0,8625; 0,8792, 0,9126 and 0,9300 (BNBK1000x) were prepared by the solid state ...
Estudo dos efeitos da orientação do campo magnético sobre a estrutura eletrônica de poços quânticos semicondutores
(Universidade Federal de São Carlos, 2015-03-27)
This work is aimed to theoretically determine, based on the k p method, the energy spectrum
of the minimum of conduction band and the top of valence band, in a quantum well
heterostructure based on gallium arsenide, ...
Simetria de Lie de uma equação KdV com dispersão não-linear
(Universidade Federal de São Carlos, 2015-04-24)
The Rosenau-Hyman, or K(m, n), equations are a generalized version of the Korteweg-de
Vries (KdV) equation where the dipersive term is non-linear. Such partial differential
equations not always have a specific method by ...
Estudo comparativo entre duas teorias de perturbação dependentes do tempo em mecânica quântica
(Universidade Federal de São Carlos, 2016-02-25)
This monograph shows two perturbative methods to determine the time evolution of quantum systems described by time-depependent Hamiltonians. One method is the standard time-dependent perturbation theory usually found in ...
Síntese e caracterização de compósitos multiferroicos de manganita La: Sr e titanatos de Ba e Sr
(Universidade Federal de São Carlos, 2011-03-18)
In this paper, we seek to prepare composite multiferroics extrinsic whose potential for technological applications, especially in the electronics industry, and the possibility of new phenomena of fundamental scientific ...
Estudos de efeitos de spin em diodos de tunelamento ressonante do tipo-p
(Universidade Federal de São Carlos, 2010-03-26)
The aim of this work was to complement the studies of the mechanisms of control of the degree of circular polarization of emission from resonant tunneling diodes p-type (RTD) by analyzing the optical properties and transport ...
Estrutura dos diagramas de fases de um modelo de filmes finos via métodos de Monte Carlo
(Universidade Federal de São Carlos, 2010-12-17)
Multilayer systems consisting of magnetic layers of heterostructures can have a variety of magnetic phases - those dependent on factors such as the exchange parameters, the geometry of the material, the temperature T to ...
A equação de Yang-Baxter para modelos de vértices com três estados
(Universidade Federal de São Carlos, 2011-03-02)
In this work we study the solutions of the Yang-Baxter equation associated to nineteen vertex models invariant by the parity-time symmetry from the perspective of algebraic geometry. We determine the form of the algebraic ...
Caracterização magnética do compósito multiferróico (1-x)Pb(Mg1/3Nb2/3)-xPbTiO3/NiFe2O4
(Universidade Federal de São Carlos, 2010-03-22)
In this work we studied the magnetic properties of nickel ferrite and the (1-x)Pb(Mg1/3Nb2/3)-xPbTiO3/NiFe2O4 (PMN-PT/NFO) multifferroic composite syntherized in different temperatures. The magnetization, magnetostriction ...
Geração e proteção de estados comprimidos do campo e estados atômicos emaranhados em cavidades ópticas
(Universidade Federal de São Carlos, 2010-03-03)
In this work we investigated the engineering of interactions and reservoirs in the context of Cavity Quantum Electrodynamics. The investigated system consists of two identical three-level atoms trapped in two distinct ...