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Interação da matéria de vórtices com estruturas de defeitos : detecção das primeiras penetrações
(Universidade Federal de São Carlos, 2009-08-07)
This thesis results from a systematic study of the interactions between penetrated vortices and pinning centers carried out on structured superconductors films of YBCO, Nb and Pb. A regular array of pinning centers (antidots, ...
Simulação por dinâmica molecular de óxidos alcalino-terrosos
(Universidade Federal de São Carlos, 2006-05-04)
The main subject of this work is to simulate structural and dynamical properties
of MeO type alkaline-earth oxides, where Me is an element of the family 2 (Me = Ca,
Sr and Ba). The use of the Molecular Dynamics method (MD) ...
Estudo das transições de fase em cerâmicas ferroelétricas de PZT e PLZT através de espectroscopia mecânica
(Universidade Federal de São Carlos, 2008-10-08)
Lead titanate zirconate (PZT) and lanthanum-modified lead titanate zirconate (PLZT) ferroelectric ceramics have been great scientific and technologic interest, due to the possibility
of your physics properties can be ...
Fases geométricas e invariantes dinâmicos em mecânica quântica
(Universidade Federal de São Carlos, 2007-05-16)
The increasing interest to understand the geometric phases (mainly due to the possi-
bility to achieve geometric quantum computation robust against some kind of errors) and
the search for new techniques to solve time-dependent ...
Sistemas eletrônicos em duas dimensões : desordem e resposta dinâmica
(Universidade Federal de São Carlos, 2009-01-28)
In disordered systems the pinning strength on the carriers due to impurities or defects is one of the most important mechanisms that produce insulator behavior. A transition to a metal phase should occur if a driving field ...
Engenharia de interações e de reservatórios
(Universidade Federal de São Carlos, 2008-05-17)
In this work we first present a protocol to build effective interactions between two cavity modes, considering a two-level atom under the action of classical fields. Bilinear Hamiltonians associated with parametric up- and ...
Ordenamento ferromagnético em poli(3-hexiltiofeno) à temperatura ambiente
(Universidade Federal de São Carlos, 2009-07-14)
In this work we present, for the first time, a systematic study of magnetic properties of an alkyl derivative of thiophene: the poly(3-hexylthiophene) prepared in acetonitrile. This polymer was investigated in different ...
Transição ordem-desordem da matéria de vórtices em supercondutores detectada através do terceiro harmônico da suscetibilidade AC
(Universidade Federal de São Carlos, 2008-12-01)
Although a vortex state, in type II superconductors, has been anticipated more than 50 years ago, a great deal of theoretical and experimental efforts has still been done in an attempt to investigate how the dynamics of ...
Seções de choque diferenciais absolutas para o espalhamento elástico de elétrons de energias baixas e intermediárias por moléculas poliatômicas em fase gasosa
(Universidade Federal de São Carlos, 2002-05-27)
In this work we report absolute elastic differential cross sections (DCS) measurements for electron collisions with OCS, CO2, CH4, NO, N2O, CHF3 e C2F6 molecules in gas phase. The measurements cover the angular range from ...
Estudos de propriedades de muitos corpos em sistemas confinados : simulacões via Monte Carlo Quântico
(Universidade Federal de São Carlos, 2009-08-28)
The Quantum Monte Carlo Method has been constituted in a powerful ab-initio tool which can afford accurate estimates of the ground-state properties of quantum many-body systems. With this subject in mind, we first present ...