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Itens para a visualização no momento 31-40 of 45
Fluxos turbulentos de CO2 em uma área de arroz irrigado no RS
(Universidade Federal de Santa Maria, 2007-11-28)
This thesis quantifies the net change of CO2 (NEE) in an irrigated rice crop cultivation in
RS (Brazil). The research is part of the project CT-HIDRO, which presents as main purpose the
description of surface conditions ...
Transições de primeira ordem no modelo vidro de spin ising fermiônico em um campo transverso
(Universidade Federal de Santa Maria, 2006-10-31)
The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic ...
Modos quase-normais de buracos negros plano-simétricos anti-de sitter em d dimensões
(Universidade Federal de Santa Maria, 2007-08-22)
Quasinormal modes of plane-symmetric anti-de Sitter (AdS) black holes in d spacetime dimensions are investigated. Following the gauge invariant prescription developed by Kodama, Ishibashi and Seto (2000), fundamental ...
Filmes finos de óxidos de vanádio depositados por sputtering reativo
(Universidade Federal de Santa Maria, 2006-05-18)
We have produced thin film samples of vanadium oxide, with different stoichiometry, by reactive magnetron sputtering from a metallic vanadium target. The thickness of the samples were maintained under 100 nm and glass or ...
Fotometria CCD UBVRI de aglomerados de estrelas das Nuvens de Magalhães
(Universidade Federal de Santa Maria, 2006-05-19)
We present UBVRI CCD photometry in the Johnson-Cousins photometric system for a sample of twenty nine Magellanic Cloud star clusters (Lindsay 16, 26, 29, 48, 53, 61, 66, 67, 72, 76, 79, 82, 83, 85 of the Small Cloud ...
Deposição de nano-grãos de Co em uma matriz de CoO/Al2O3 por Magnetron Sputtering
(Universidade Federal de Santa Maria, 2007-10-20)
Granular magnetic systems can be composed by magnetic particles or clusters with size of some nanometers. These magnetic nanoparticles present different magnetic order phases, as superparamagnetic, and they can be embedded ...
Deposição de nano-camadas de VO2 por Magnetron Sputtering
(Universidade Federal de Santa Maria, 2007-04-13)
The vanadium dioxide (VO2) shows a metal-insulator transition (MIT) near the room temperature with huge changes in its electrical and optical behavior. Both the
electrical and optic properties, and even the transition ...
Estudo do parâmetro de ordem e do momento magnético em borocarbetos pseudoquaternários
(Universidade Federal de Santa Maria, 2007-03-27)
Experimental data show that the dissolved impurities of the Mn presents a magnetic moment when substitute the Ni atom in pseudoquaternary borocarbide Y (Ni(1−x)Mx)2B2C, this is not observed if the impurities are Fe and Co. ...
Nanotubos de carbono interagindo com selênio: uma simulação de primeiros princípios
(Universidade Federal de Santa Maria, 2009-01-15)
This work presents a theoretical study about the interaction between semiconducting carbon nanotubes (8,0) single-wall (SWNT), with selenium nanostructures by first principles calculations using the density functional ...
Escala temporal da turbulência para escoamento noturno acima da copa de uma floresta tropical úmida na Amazônia
(Universidade Federal de Santa Maria, 2008-09-12)
The LBA (Large Scale Biosphere-Atmosphere in Amazônia) project has been using
the eddy covariance technique since 1998 to continuously monitor the surface fluxes of
energy, water vapor and carbon over Amazônia. The results ...