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Itens para a visualização no momento 11-20 of 44
Estudo sobre a turbulência na camada limite planetária
(Universidade Federal de Santa Maria, 2008-01-31)
In this research was made a study about the development of the boundary layer in Pedras Altas – RS. This study is made in two parts, fist a theoretician introduction then some datum, collected from a meteorological tower, ...
Propriedades eletrônicas e estruturais de impureza substitucional de silício em nanotubos de BC2N
(Universidade Federal de Santa Maria, 2008-12-10)
Spin polarized density functional theory (SP-DFT) is used to investigate the incorporation of substitutional Si atoms in the zigzag (5,0) and in the armchair (3,3) BC2N nanotubes (NTs). Our results show that the Si impurities ...
Anomalias de traço e radiação de Hawking
(Universidade Federal de Santa Maria, 2007-03-08)
In the present work we obtain the general form for the anomalous stress-energy tensor for static black holes with spherical symmetry, for the three quantum vacuum states of interest in black holes physics. The particular ...
Construindo árvores filogenéticas com o uso de caminhadas aleatórias e geometria fractal
(Universidade Federal de Santa Maria, 2008-11-28)
The purpose of this study is to propose an alternative method to build phylogenetic trees using the fractal dimension calculated from (pseudo) random walks on mitochondrial DNA and ribosomal RNA of some species of living ...
Avanço do periastro e deflexão da luz no campo gravitacional de estrelas e buracos negros carregados e em rotação
(Universidade Federal de Santa Maria, 2007-03-08)
In the present study it is obtained analytic expressions to the periastron advance and light bending in the gravitational field of rotating and electrically charged black holes. First it is made a historical review emphasizing ...
Estudo da variabilidade da aeroluminescência noturna na alta atmosfera terrestre
(Universidade Federal de Santa Maria, 2008-12-18)
This work intends to study the airglow emissions in the Earth's upper atmosphere, between 70 and 300 km of altitude. The study implies a physical understanding of the processes involving airglow phenomenology and its ...
Nanofios de arseneto de gálio e arseneto de alumínio
(Universidade Federal de Santa Maria, 2008-01-30)
We present a first principle study of both bulk e nanowire phases of GaAs and AlAs. We first reproduced the known properties of the bulk materials and then applied the same methodology to study the properties with the ...
Filmes finos supercondutores de alta temperatura crítica
(Universidade Federal de Santa Maria, 2008-12-11)
The recent discoveries of new superconductors materials have attracted huge interest, not only by their technological potential, but also by their contributing to the understanding of basic mechanisms responsible by the ...
Propriedades estruturais e eletrônicas de nanotubos mistos de silício-germânio
(Universidade Federal de Santa Maria, 2008-01-31)
The aim of this work is perform a study about the electronic and structural properties of the mixed silicon germanium (SiGe) nanotubes. This study was performed using two different methods: one through Monte Carlo simulations ...
Nanotubos de nitreto de gálio e nitreto de alumínio
(Universidade Federal de Santa Maria, 2008-01-30)
We performed a study of the electronic structure of gallium nitride (GaN) and aluminium nitride (AlN) nanotubes, Al x Ga 1-x N nanotube alloys, as well as heterojunctions between GaN/AlN and Al x Ga 1-x N/AlN nanotubes. ...