Distance Fields
Mostrando 25-36 de 104 artigos, teses e dissertações.
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25. Clustering analysis of the data of DFA profiles of eletric induction in oil wells / Análise de agrupamentos dos dados de DFA oriundos de perfis elétricos de indução de poços de petróleo
The main objective of this study is to apply recently developed methods of physical-statistic to time series analysis, particularly in electrical inductions profiles of oil wells data, to study the petrophysical similarity of those wells in a spatial distribution. For this, we used the DFA method in order to know if we can or not use this technique to charac
Publicado em: 2009
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26. Evaluating the risk of leukemia, brain cancer and amyotrophic lateral sclerosis deaths in relation to magnetic field exposure: a case-control study in the city of São Paulo / Avaliação do risco de mortalidade por leucemia, neoplasias do sistema nervoso central e esclerose lateral amiotrófica associado à exposição residencial a campos magnéticos: um estudo do tipo caso-controle no Município de São Paulo
This work aimed at evaluating the risk of death by leukemia, brain tumor and amyotrophic lateral sclerosis in adults in relation to magnetic field exposure, in the city of São Paulo. A population-based case-control study was held, and 6224 subjects were enrolled. Cases and controls were selected from the PROAIM database, and were matched by sex, age and dis
Publicado em: 2009
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27. Effects of buflomedil and pentoxifylline on hamster skin-flap microcirculation: prediction of flap viability using orthogonal polarization spectral imaging
OBJECTIVE: This study investigated the effects of buflomedil and pentoxifylline, both of which are used in reconstructive surgery of hamster skin flap microcirculation, and evaluated the skin flap survival rate by orthogonal polarization spectral imaging. METHOD: Twenty-four adult male Syrian golden hamsters were divided into three groups: a control (C, 0.1
Clinics. Publicado em: 2009
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28. InfluÃncia de variÃveis ambientais e espaciais na distribuiÃÃo geogrÃfica da famÃlia Cactaceae no leste do Brasil. / Influence of environmental and spatial variables on the Cactaceae family distribution in eastern Brazil.
This paper was realized with aim of investigate the influence of climatic-environmental and spatial variables and six different vegetation formations on the cacti flora in eastern Brazil. Species occurrence and variables were extracted from bibliography and data banks and after were submitted to Canonical Correspondence Analysis (CCA), Detrended Corresponden
Publicado em: 2009
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29. Elites e formação nacional: as gerações de 1830 do Brasil e da Argentina
Despite the attempt of ideologists to formulate the nationalist spirit, according to Benedict Anderson, European nationalities were also created by the bombastic and non-intentional interaction between capitalism, the beginning of the editorial effort, and the linguistic diversity. The New World, like Europe, depended on ideologues to build the nations imagi
Publicado em: 2009
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30. Signatures of two distinct driving mechanisms in the evolution of coronal mass ejections in the lower corona / Assinaturas de dois mecanismos distintos na evolução de ejeções de massa coronal na baixa coroa
Coronal mass ejections (CMEs) are the major driver for space weather disturbances. Their physical mechanisms and their influence on the geospace environment are the subject of active research and debate. Our goal is to understand how the initial magnetic configuration of a CME affects its evolution through the lower corona, until 6R⊙. We compare ou
Publicado em: 2009
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31. Estudo da desativação do agente VX usando o MgO por cálculos ab initio
The organophosphates are used in industry, in the fields of dyes, varnishes, artificial leather, electrical insulation, waterproofing, plastics, oil additives and solvents, are also used in medicine to treat diseases such as glaucoma, in the household and in agriculture are applied as insecticides and pesticides. Besides these various civilian facilities, th
Publicado em: 2009
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32. Evolutionary history of Phakopsora pachyrhizi (the Asian soybean rust) in Brazil based on nucleotide sequences of the internal transcribed spacer region of the nuclear ribosomal DNA
Phakopsora pachyrhizi has dispersed globally and brought severe economic losses to soybean growers. The fungus has been established in Brazil since 2002 and is found nationwide. To gather information on the temporal and spatial patterns of genetic variation in P. pachyrhizi , we sequenced the nuclear internal transcribed spacer regions (ITS1 and ITS2). T
Genetics and Molecular Biology. Publicado em: 19/11/2008
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33. Shielded transceiver RF coil array for simultaneous PET-MRI
The complementary information provided by combined MRI-PET modalities promises to facilitate metabolic investigations of complex physiological processes. We developed a radio frequency (RF) coil array that can operate in close proximity (2-mm radial distance) to a miniaturized PET camera insert for simultaneous PET-MRI of a rat brain at high magnetic fields
Brazilian Journal of Physics. Publicado em: 2008-06
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34. Sobre codigos hermitianos generalizados / On generalized hermitian codes
We study Goppa codes (GH codes) based on certain algebraic function fields whose number of rational places is large. These codes generalize the well-known Hermitian codes; thus we might expect that they have good parameters. Bulygin (IEEE Trans. Inform. Theory 52 (10), 46644669 (2006)) initiate the study of GH-codes; while he considered only the even chara
Publicado em: 2008
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35. Reticulados e codigos / Lattices and codes
We approach here some problems related to minimizing the error probability in signals transmission over Gaussian and Rayleigh channels. Algebraic ideal lattice theory is used to construct rotations of the n-dimensional integer lattice via cyclotomic fields. This construction allows to evaluate the minimum product distance of the lattice, parameter which cont
Publicado em: 2008
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36. GPU-ACCELERATED ADAPTIVELY SAMPLED DISTANCE FIELDS / CAMPOS DE DISTÂNCIA AMOSTRADOS ADAPTATIVAMENTE COM ACELERAÇÃO POR PLACA GRÁFICA
A representação de formas é um problema fundamental em Computação Gráfica. Dentre as representações conhecidas para objetos tridimensionais, os campos de distância amostrados adaptativamente (ADFs) destacam-se por sua versatilidade. ADFs combinam os conceitos de geometria com dados volumétricos, permitem representar objetos com precisão arbitrári
Publicado em: 2008