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Estudo da anisotropia unidirecional e da histerese rotacional em sistemas com exchange bias
(Universidade Federal de Santa Maria, 2014-08-18)
The exchange bias (EB) phenomen occurs due to the coupling between ferromagnetic and
antiferromagnetic material and the main characteristics are the rise of unidirectional anisotropy
and the rotational hysteresis in torque ...
Simulação ab initio de nanotubos de carbono funcionalizados via adsorção e deformação estrutural
(Universidade Federal de Santa Maria, 2014-08-29)
In this thesis the behavior of functionalized carbon nanotubes via chemical and physical
adsorption and estrural deformation is studied through ab initio calculations based
on the DFT formalism, using the SIESTA program. ...
Cálculos de primeiros princípios em isolantes topológicos: HgTe/CdTe
(Universidade Federal de Santa Maria, 2014-12-15)
The observation of the quantum spin Hall effect in the HgTe/CdTe heterostructure triggered
the study of materials exhibiting a spin polarized electronic current at their surfaces/
interfaces. These states are topologically ...
Investigação teórica sobre possíveis aplicações na eletrônica de nanofios de AlN, GaN e InN: um estudo de primeiros princípios
(Universidade Federal de Santa Maria, 2012-07-30)
Using the formalism of Density Functional Theory with spin polarization and the Generalized
Gradient Approximation for exchange and correlation term, we studied the stability
and electronic properties of substitutional ...
Susceptibilidade magnética de um modelo de Hubbard estendido com interação ao atrativa
(Universidade Federal de Santa Maria, 2012-01-17)
Anomalous properties of the normal state of a strongly correlated electron system described
by an attractive extended Hubbard model are investigated. The equations of motion
of the Green s functions are calculated with the ...
Derivação de coeficientes de difusão turbulenta em condições de vento norte: aplicação em um modelo analítico euleriano de dispersão de poluentes
(Universidade Federal de Santa Maria, 2012-06-15)
The advection-diffusion equation has been extensively used in air pollution models to simulate mean contaminant concentrations in the planetary boundary layer (PBL). Therefore, in a Eulerian framework, it is possible to ...
Um estudo do hidrogênio neutro e rádio contínuo em galáxias seyfert com mopra e atca
(Universidade Federal de Santa Maria, 2006-12-01)
In this work 21-cm observations of a sample of 27 southern nearby galaxies (z < 0:018) are presented with a detected Hi line with the Mopra/ATNF radiotelescope. The total
neutral hydrogen gas content has been derived and ...
Dinâmica da transição pré-câncer para câncer: estudo da expressão de vias de manutenção do genoma
(Universidade Federal de Santa Maria, 2012-07-09)
The loss of genomic stability associated with genetic deterioration is one of the many important aspects for the development of carcinomas. The genome maintenance mechanisms (GMM) ensure the integrity of DNA and cell ...
Um modelo euleriano de dispersão de contaminantes aplicado em diferentes condições de estabilidade atmosférica
(Universidade Federal de Santa Maria, 2004-04-23)
This work describes a model for contaminant dispersion under
different atmospheric stability conditions. It can be used to simulate the concentration of contaminants released from sources located at different heights in ...
Estudo de primeiros princípios de nanofios em arseneto de índio e fosfeto de índio
(Universidade Federal de Santa Maria, 2011-07-29)
In this work we used the density functional theory to study InAs and InP nanowires
and InAs/InP nanowire heterostructures. Initially we studied the structural, electronic
and mechanical properties of InAs and InP nanowires ...