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Mostrando ítems 11-20 de 81
Influência de solutos intersticiais em nióbio e ligas nióbio-zircônio.
(Universidade Federal de São Carlos, 2005-07-20)
Metals of body-centered cubic structure that contain heavy interstitial solutes, such as oxygen
and nitrogen in solid solution, present anelastic relaxation peaks when submitted to cyclic tensions,
due to the process called ...
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 ...
Engenharia de interações fônon-fóton-matéria mediadas por um campo clássico.
(Universidade Federal de São Carlos, 2004-04-30)
In this work we consider the problem of a three-level trapped ion inside a high-
Q cavity. We study the process of phonon-foton-matter interaction mediated by a
classical field. We are particularly interested in the ...
Simulações computacionais de sistemas eletrônicos em geometrias confinadas
(Universidade Federal de São Carlos, 2008-06-27)
In this work, structural and dynamic properties of a two-dimensional electron system trapped to helium film, deposited on a solid substrate, are determined through molecular dynamics simulation. The influence of the film ...
Efeitos anarmônicos e transições de fase em Pb1¡xLaxTiO3: estudo por espalhamento Raman dos efeitos de substituição catiônica, temperatura e pressão hidrostática
(Universidade Federal de São Carlos, 2008-08-22)
In this work were studied e®ects of cationic substitution, hydrostatic pressure and temperature on the phonon spectra of PLT samples, Pb1¡xLaxTiO3 (PLT), using Raman scattering technique. The samples having La concentration ...
Interação da matéria de vórtices com estruturas de defeitos em filmes de Nb
(Universidade Federal de São Carlos, 2009-03-30)
In this work we have studied the Vortex Matter dynamics in Nb superconducting films with different arrays of columnar defects. For that we studied the order-disorder line H (T) OD , where the melting of the vortex lattice ...
Estudos de avalanches de vórtices em filmes supercondutores de Nb e MgB2
(Universidade Federal de São Carlos, 2008-10-28)
If a type-II superconductor is cooled down in a zero applied field and subsequently an external field, larger than the first critical field, is applied, vortices enter through the sample borders until they are captured by ...
Interação plasmon-fônon LO em superredes semicondutoras
(Universidade Federal de São Carlos, 2008-10-07)
This work presents a Raman investigation of the optical vibrations in highly doped In-GaAs/InP and GaAs/AlGaAs superlattices (SL s). The InGaAs/InP SL s grown with different
periods were analyzed using polarized Raman ...
Origem dos momentos magnéticos localizados em ligas de cromo com metais de transição por oscilações de Friedel
(Universidade Federal de São Carlos, 2006-08-02)
The fundamental magnetic properties of chromium and its alloys Cr(1¡x)Nb(x) and Cr(1¡x)V(x), were investigated with the aim to achieve a better comprehension about the nature of the spin density waves. Was dened the edge ...
O estudo do limite de transporte interfilamentar de supercorrentes em amostras supercondutoras de BSCCO.
(Universidade Federal de São Carlos, 2006-03-15)
In this work, we have studied the behavior of the line H*(T) in filamentary samples of BSCCO, which were grown by the LFZ technique, Laser Floating Zone. Previously studied in other specimens prepared by specific routes ...