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Mostrando ítems 61-70 de 186
Regras de ocupação e influência de dopantes trivalentes em matrizes cerâmicas transparentes de PLZT 9/65/35
(Universidade Federal de São Carlos, 2009-10-01)
In this work, were investigated the occupancy of rare-earth ions in lattice site of the ferroelectric system (Pb,La)(Zr,Ti)O3, or PLZT. The influence on the structural, microestructural, dielectric, ferroelectric, optical ...
O efeito Casimir dinâmico e decoerência
(Universidade Federal de São Carlos, 2008-07-03)
In this thesis we first demonstrate that the inevitable action of the environment can be substantially weakened when considering appropriate nonstationary quantum systems. Beyond protecting quantum states against decoherence, ...
Estudo de efeitos quânticos em redes de junções Josephson SNS e SIS com composição Nb-CuxAlyOz-Nb através da indução de vórtices por conseqüência do tamanho de rede
(Universidade Federal de São Carlos, 2009-10-16)
In this thesis we studied the quantum effects in networks of Josephson junctions under the induction of vortices and as a consequence of the size of the sample itself. For this, it also was carried out all the instrumentation ...
Síntese e caracterização de compósitos magnetoelétricos particulados de ferritas de Co e Ni e ferroelétricos no CFM
(Universidade Federal de São Carlos, 2010-08-15)
Nowadays, the optimized magnetoelectric coupling in particulate composites is based on the optimization of the processing techniques, which support an integrity interface between the phases, and on the novel combinations ...
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco
(Universidade Federal de São Carlos, 2010-11-25)
Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and normal ferroelectric PbTiO3 (PT) [PFW-PT] has been synthesized by a modified B-site precursor method and characterized by ...
Modelos magnéticos com frustração e diluição
(Universidade Federal de São Carlos, 2006-12-08)
In this work, we investigate the effect of dilution and frustration in the thermodynamic properties and the phase diagrams using the quasi-two-dimensional Heisenberg and Ising models. We use the Zubarev Green´s function ...
Dinâmica de coerência e decoerência de estados em redes de osciladores quânticos dissipativos.
(Universidade Federal de São Carlos, 2004-07-02)
In this thesis we studied the coherence and decoherence dynamics of states in
a network of dissipative quantum oscillators. The coherence dynamics refers to
the swap and recurrence process of states between the oscillators ...
Efeitos da interação de plasma na absorção ótica em super-rede randômica de pontos quânticos.
(Universidade Federal de São Carlos, 2004-09-13)
In this work the ground and first excited states of the electron are calculated
in interacting one-dimensional, two-dimensional lattices and multilayers
of cylindrical quantum dots containing at the most an electron and ...
Ansatz de Bethe para cadeias quânticas de spin-1 com condições de contorno
(Universidade Federal de São Carlos, 2002-03-21)
The procedure for obtaining integrable open spin chain Hamiltonians via reflection
matrices explicitly carried out for some three-state vertex models. We have considered
the 19-vertex models of Zamolodchikov-Fateev and ...
Medições destrutivas e não-destrutivas em campos eletromagnéticos e processos não-estacionários em eletrodinâmica quântica de circuitos
(Universidade Federal de São Carlos, 2009-02-10)