Orientation Tensor
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Tensor baseado em fluxo óptico para descrição global de movimento em vídeos
Movimento é uma das características fundamentais que refletem a informação semântica em vídeos. Uma das técnicas de estimativa do movimento é o cálculo do fluxo óptico. Este é uma representação 2D (bidimensional) das velocidades aparentes de uma sequência de quadros (frames) adjacentes, ou seja, a projeção 2D do movimento 3D (tridimensional)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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2. Decoherence and relaxation time in an ensemble of quantum dots / Tempos de relaxação e decoerencia em ensembles de pontos quanticos
Experimental measurements were carried out to determine the scales of the relaxation and decoherence time for the electronic spin as quantum bit. The structure of the exciton states was investigated with the objective to serve as intermediate states in the spin manipulation. The system studied for the implementation of the quantum computation is an ensemble
Publicado em: 2007
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3. Inferência de orientação de dados esparsos para reconstrução de superfícies
Orientation inference of sparse data for surface reconstruction This work approaches the problem of sparse data spatial organization inference for surface reconstruction. We propose a variant of the voting method developed by Gideon Guy and extended by Mi-Suen Lee. Tensors to represent orientations and spatial infuence ¯elds are the main mathematical instru
Publicado em: 2002
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4. Orientação do corpo humano como um todo a partir do seu elipsoide central de inercia
This research propose a methodology to define the orientation of the human body as a unit trom its central ellipsoid of inertia, which is determined by its central tensor of inertia, calculated trom the body mass distribution. A body local reference system was defined, fixed to the body, in a way that its origin is coincident to the body s center of mass and
Publicado em: 2000
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5. Esquemas de alta resolução para controle da dispersão numerica em simulação de reservatorios
Standard finite-diference reservoir simulation normally uses single-point upstream welghting to approximate the components of the convective flow term at the interfaces between blocks. This procedure stabilizes the numerical solution, but introduces high levels of numerical dispersion, difficulting the correct interpretation of the simulated results. Exponen
Publicado em: 1991
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6. Electronic structure of Q-A in reaction centers from Rhodobacter sphaeroides. I. Electron paramagnetic resonance in single crystals.
The magnitude and orientation of the electronic g-tensor of the primary electron acceptor quinone radical anion, Q-A, has been determined in single crystals of zinc-substituted reaction centers of Rhodobacter sphaeroides R-26 at 275 K and at 80 K. To obtain high spectral resolution, EPR experiments were performed at 35 GHz and the native ubiquinone-10 (UQ10)
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7. Anisotropic magnetic interactions in the primary radical ion-pair of photosynthetic reaction centers
The quantum yield of triplets formed by ion-pair recombination in quinone-depleted photosynthetic reaction centers is found to depend on their orientation in a magnetic field. This new effect is expected to be a general property of radical pair reactions in the solid state. For 0 < H < 1,000 G, the quantum yield anisotropy is caused by anisotropic electron d
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8. Photosystem II single crystals studied by EPR spectroscopy at 94 GHz: The tyrosine radical Y\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{document} \begin{equation*}{\mathrm{_{D}^{{\bullet}}}}\end{equation*}\end{document}
Electron paramagnetic resonance (EPR) spectroscopy at 94 GHz is used to study the dark-stable tyrosine radical Y\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{document} \begin{equation*}{\mathrm{_{D}^{{\b
The National Academy of Sciences.
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9. Displacement of the tyrosyl radical cofactor in ribonucleotide reductase obtained by single-crystal high-field EPR and 1.4-Å x-ray data
The R2 protein of class I ribonucleotide reductase generates and stores a tyrosyl radical essential for ribonucleotide reduction and, thus, DNA synthesis. X-ray structures of the protein have enabled detailed mechanistic suggestions, but no structural information has been available for the active radical-containing state of the protein. Here we report on met
National Academy of Sciences.
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10. A spectroscopic method for observing the domain movement of the Rieske iron–sulfur protein
The g-tensor orientation of the chemically reduced Rieske cluster in cytochrome bc1 complex from Rhodovulum sulfidophilum with respect to the membrane was determined in the presence and absence of inhibitors and in the presence of oxidized and reduced quinone in the quinol-oxidizing-site (Qo-site) by EPR on two-dimensionally ordered samples. Almost identical
The National Academy of Sciences.
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11. Heteronuclear NMR investigations of dynamic regions of intact Escherichia coli ribosomes
15N-1H NMR spectroscopy has been used to probe the dynamic properties of uniformly 15N labeled Escherichia coli ribosomes. Despite the high molecular weight of the complex (≈2.3 MDa), [1H-15N] heteronuclear single-quantum correlation spectra contain ≈100 well resolved resonances, the majority of which arise from two of the four C-terminal domains of the
National Academy of Sciences.
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12. Modeling of polypeptide chains as C alpha chains, C alpha chains with C beta, and C alpha chains with ellipsoidal lateral chains.
In an effort to reduce the number of degrees of freedom necessary to describe a polypeptide chain we analyze the statistical behavior of polypeptide chains when represented as C alpha chains, C alpha chains with C beta atoms attached, and C alpha chains with rotational ellipsoids as models of side chains. A statistical analysis on a restricted data set of 75