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Estudo das propriedades eletrônicas e estruturais da heterojunção dos nanotubos de nitreto de boro e nitreto de alumínio
(Universidade Federal de Santa Maria, 2007-05-18)
In this work we present the study of the electronic and structural properties of the heterojunction formed by (10,0) zig-zag nanotubes of aluminum nitride (AlN) and boron nitride (BN). To simulate the system, we use periodic ...
Consistência no cálculo perturbativo tridimensional em teoria quântica de campos: a eletrodinâmica quântica
(Universidade Federal de Santa Maria, 2005-03-14)
In this work we present a detailed study about the three-dimensional quantum electro-
dynamics QED3, in perturbative solution at the one loop level. A very general method,
concerning the manipulations and calculations ...
Consistência no cálculo perturbativo: a eletrodinâmica quântica e a anomalia
(Universidade Federal de Santa Maria, 2004-12-13)
We use a very general calculational method, concerning the divergences manipulations and calculations, in order to treat the perturbative solution of quantum electrodynamics (QED), at the one loop level, as well as to study ...
Variações espaciais de propriedades físicas do remanescente de supernova RCW 103
(Universidade Federal de Santa Maria, 2008-06-19)
Since the observation of the supernova event SN 1987A, observational research on supernova and supernova remnants, including the ones on the optical spectrum,
has been much explored. However, most of these studies have ...
Estuda da formação de vacância induzida em nanotubos de carbono
(Universidade Federal de Santa Maria, 2004-12-14)
In this work we have performed the study of the single vacancy and the induced vacancy in carbon nanotubes by first-principles calculations using the SIESTA code,
which solves the Kohn-Sham equations via the local density ...
Estudo do ciclo diário da camada limite planetária através da simulação dos grandes turbilhões
(Universidade Federal de Santa Maria, 2008-12-15)
The PBL is the region on the troposphere characterized by existence of turbulence (BUSINGER, 1981). Turbulent flow is that when the fluctuations of the variables that describe the flow are amplified in time and space ...
Modelagem lagrangeana aplicada à dispersão de contaminantes em diferentes condições de estabilidade atmosférica
(Universidade Federal de Santa Maria, 2008-04-25)
In this dissertation, it was estimated contaminants concentration in different stability conditions of the Planetary Boundary Layer. In order to do this, it was used the Lagrangian stochastic model. The experiments by ...
Nanotubos de carbono interagindo com vitaminaS B3 e C: um estudo de primeiros princípios
(Universidade Federal de Santa Maria, 2008-03-18)
This work presents a theoretical study about the interaction between pristine or functionalized B3 and C vitamins with semiconducting carbon nanotubes (8,0) through first principles simulations. We evaluate the structural ...
Vidro de spin e antiferromagnetismo com interacão de pareamento BCS local
(Universidade Federal de Santa Maria, 2005-07-12)
In this work the competition among spin glass(SG), antiferromagnetism (AF) and BCS pairs formation (PAIR) in real space is investigated. The model consists of an Ising spin glass term and a local BCS term that favors double ...
Estudo de primeiros princípios da interacão de monóxido de carbono com nanotubos de carbono semicondutores
(Universidade Federal de Santa Maria, 2004-10-08)
In this work we study the interaction of carbon monoxide with semiconducting (8,0)carbon nanotube through a first principles theoretical approach. Using density functional theory based methods, we show that radial ...