Geometric Phases
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Evaluation via multivariate techniques of scale factor variability in the rietveld method applied to quantitative phase analysis with X ray powder diffraction
The present work uses multivariate statistical analysis as a form of establishing the main sources of error in the Quantitative Phase Analysis (QPA) using the Rietveld method. The quantitative determination of crystalline phases using x ray powder diffraction is a complex measurement process whose results are influenced by several factors. Ternary mixtures o
Materials Research. Publicado em: 2006-12
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14. Molecular simulation of hydrocarbons adsorption in aluminophosphates / Simulação molecular da adsorção de hidrocarbonetos em aluminofosfatos
Molecular simulation techniques were used to study the ortho-selectivity causes of C8 isomers in aluminophosphate molecular sieves structures. Approximated and optimized force fields of the AA type were applied in the grand canonical ensemble with biased and conventional Monte Carlo algorithms (GCMC). We simulated pure-components isotherms, adsorption heats
Publicado em: 2006
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15. O componente espacial da habilidade matematica de alunos do ensino medio e as relações com o desempenho escolar e as atitudes em relação a matematica e a geometria
In considering the influence of cognitive and affective factors in academic achievement of geometry, the objectives of this work were to analyze the spatial component of mathematical ability and to verify the existence of relations among this component, the spatial sense, the attitudes toward Mathematics and Geometry and the academic performance. The subject
Publicado em: 2005
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16. Tiling in the geometric model for water
Hydrogen bonded liquids like water present a rich thermodynamic behaviour due to the strength and directionality of the bonds. In a recent paper a geometric model based on Bernal's model for liquids was proposed to study the effects of the hydrogen bonds on the phase transitions of water, under pressure and temperature variations. Water molecules were assume
Brazilian Journal of Physics. Publicado em: 2004-03
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17. Uso de imagens Radarsat-1 para fins de mapeamento de uso da terra e cobertura do solo em ambiente tropical úmido urbano: o caso de Manaus, Estado do Amazonas. / Use of radarsat-1 data in the identification of targets related to land use and land cover in urban humid tropical region: the case of Manaus, state of the Amazon, Brazil
The use of remote sensing data acquired through Synthetic Aperture Radar has been a recent common trend for land use and land cover mapping purposes. The information derived from this kind of data has been applied to distinct related application fields, such as: urban pattern analysis and mapping, settlements identification, urban change detection and even m
Publicado em: 2002
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18. Estudo e desenvolvimento de um extrator de palhetas rotativas
The growth necessity to get higher separation efficiencies in the minimim space has incentivated the researchers to develop new kinds of equipment. The most employed equipment to carry out liquid-liquid extraction processes are the mechanically agitated ones because they provide better performances. Many other types of equipment are presented in literature.
Publicado em: 1997
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19. Simulação numerica do comportamento mecanico do sal em poços de petroleo
Drilling incidents such as stuck pipe and collapsed casing string take place when some type of salt formations are drilled because of the high pronounced plastic behavior of the salt and the creep behavior as a function of time of this type of rock. The creep behavior becomes faster and more severe if temperature and/or pressure acting on the salt go up. The
Publicado em: 1997
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20. Periodic phenomena in Proteus mirabilis swarm colony development.
Proteus mirabilis colonies exhibit striking geometric regularity. Basic microbiological methods and imaging techniques were used to measure periodic macroscopic events in swarm colony morphogenesis. We distinguished three initial phases (lag phase, first swarming phase, and first consolidation phase) followed by repeating cycles of subsequent swarming plus c
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21. Changes in myelin sheath thickness and internode geometry in the rabbit phrenic nerve during growth.
The rabbit phrenic nerve was studied at seven phases of growth from the newborn to the adult to determine the length of the nerve fibres, the length of the internodes, the fibre calibre, the geometric proportions of the internodes and the thickness of the myelin sheaths. The elongation of the internodes corresponded precisely to the elongation of the nerve,
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22. High resolution of Trypanosoma cruzi amastigote antigen in serodiagnosis of different clinical forms of Chagas' disease.
The serodiagnosis of Chagas' disease, a highly prevalent disorder in South American countries, is usually made by the detection of antibodies to Trypanosoma cruzi epimastigote antigen. In this study, we assess the diagnostic performance of the immunofluorescence test with T. cruzi (Y strain) amastigote antigen from an LLC-MK2-infected cell supernatant in com