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Itens para a visualização no momento 11-20 of 1660
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 ...
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 ...
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 ...
Estimativas das trocas líquidas de carbono em duas áreas de cultivo de arroz irrigado na região central do RS
(Universidade Federal de Santa Maria, 2012-07-26)
The turbulent fluxes of carbon dioxide (CO2 ) were investigated in two sites of
irrigated rice in southern Brazil, using the eddy covariance technique over 385 days
of analysis at the site of Paraiso do Sul and 683 days ...
Variações espaciais de temperatura e densidade eletrônica de regiões HII nas Nuvens de Magalhães
(Universidade Federal de Santa Maria, 2010-04-02)
The aim of this work had to estimate the physical proprieties of the HII region NGC 346 (belonging the Small Magellanic Cloud) and the estimation of electron density
at point-to-point to 17 other ionized nebulae, in ...
Transicões inversas em modelos fermiônicos de vidro de spin
(Universidade Federal de Santa Maria, 2010-08-26)
The present work studies inverse transitions by using two spin glass models: the infinite-range fermionic Ising spin glass (FISG) in the presence of a transverse magnetic field
¡ and Hopfield fermionic Ising spin glass ...
Novos polímeros de coordenação e complexos moleculares envolvendo seleninatos e selenonatos
(Universidade Federal de Santa Maria, 2012-07-03)
In this work thirteen new compounds were synthesized and characterized using the
two acids, phenylseleninic (1) and 4-bromophenylseleninic (2) as ligands precursors.
Reactions were carried out using ammonium salts of ...
Prospecção fitoquímica e atividade biológica de plantas medicinais da família asteraceae do bioma pampa
(Universidade Federal de Santa Maria, 2012-04-09)
The species selected for this study were: Pluchea sagittalis, Baccharis
pentodonta and Baccharidastrum triplinervium, all belonging to the Asteraceae
family. The extracts and fractions from leaves and roots of three species ...