Particles Acceleration
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. EFFECT OF NON-DARCY FLOW COEFFICIENT VARIATION DUE TO WATER VAPORIZATION ON WELL PRODUCTIVITY OF GAS CONDENSATE RESERVOIRS
Abstract Well productivity of gas condensate reservoirs is highly affected by near-wellbore phenomena. Inertial force resulting from convective acceleration of fluid particles in the medium, as well as viscous force, determines the flow of gas through porous media at high velocity. Pressure drop builds up the molar content of water in gas by water vaporizati
Braz. J. Chem. Eng.. Publicado em: 2015-03
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2. High-time resolution measurements of black carbon particles in the exhaust emissions of a diesel engine during acceleration, deceleration and cruise conditions
Carbono negro (BC) é o componente principal de emissões de motores a diesel. Aethalometer® foi usado nas medições das concentrações de BC (com resolução temporal de 5 s) emitido pelo escapamento de uma caminhonete tipo pick-up a diesel Dodge RAM 2500 1995 equipada com catalisador de oxidação. As medições foram feitas com um dinamômetro de chass
Journal of the Brazilian Chemical Society. Publicado em: 2012-06
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3. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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4. A Mechanism to Accelerate the Late Ablation in Pulsed Plasma Thrusters
Pulsed Plasma Thrusters (PPTs) are long standing electric propulsion thrusters that are reliable, relatively simple and low cost. One of the main issues with the PPT is its poor utilization of the propellant and low efficiency. Typically only 40-60% of the propellant contributes to the production significant impulse and the efficiency is around 8%. The cause
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200902
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5. Estudo de anisotropias de UHECR s em dados do Observatorio Pierre Auger / Study of anisotropies of cosmic rays in data from the Pierre Auger
Almost a century after the discovery of cosmic radiation, their origin, composition, acceleration and propagation mechanisms in the universe is still unknown for the ultra-high energy component ( >~ 1018 eV). The mystery grows due to the suppression (GZK cutoff) in the ux of cosmic rays with energies E >~ 6 × 10 19 eV, caused by the interaction of these par
Publicado em: 2009
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6. Estudo de um sistema de limpeza de gases usando um lavador venturi de seÃÃo Circular
Venturi scrubbers are simples, low cost and highly applicable equipments. They are used in the industry as gas cleaners and in other to control the pollution. The objective of this work was to evaluate a gas cleaning system using Venturi scrubbers with circular section to remove particles off a gas flux. The tests were realized with 2,21 and 9,06 μm par
Publicado em: 2008
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7. Estudo de um sistema de limpeza de gases usando um lavador venturi de seção Circular
Venturi scrubbers are simples, low cost and highly applicable equipments. They are used in the industry as gas cleaners and in other to control the pollution. The objective of this work was to evaluate a gas cleaning system using Venturi scrubbers with circular section to remove particles off a gas flux. The tests were realized with 2,21 and 9,06 μm par
Publicado em: 2008
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8. Acelaração do universo e criação gravitacional de matéria escura fria: novos modelos e testes observacionais
Recent astronomical observations (involving supernovae type Ia, cosmic background radiation anisotropy and galaxy clusters probes) have provided strong evidence that the observed universe is described by an accelerating, flat model whose space-time properties can be represented by the FriedmannRobertsonWalker (FRW) metric. However, the nature of the substanc
Publicado em: 2008
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9. Growing of the inhomogeneities and acceleration phase in a universe with lambda decay
We study a model with decay of dark energy and creation of the dark matter particles. We integrate the field equations and find the transition redshift where the evolution process of the universe change from decelerated to an accelerated phase expansion, and briefly discuss the transition epoch and the broken of the strong energy condition. Finally, we exami
Brazilian Journal of Physics. Publicado em: 2007-12
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10. Issuance of metals by motor vehicles and their effects on public health / Emissão de metais por veículos automotores e seus efeitos à saúde pública
Introduction: The presence of fine metal particles in the urban atmosphere is a big concern considering that a significant accumulation of these elements has been registered during the last decades. Information about metal level in the tailpipe is scarce and specific Brazilian emission references are basically inexistent. Objective. Experimentally characteri
Publicado em: 2007
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11. Queijo Minas artesanal da Canastra maturado à temperatura ambiente e sob refrigeração / Artisanal Minas cheese from the Canastra Mountain Range matured at room temperature and under refrigeration
The purpose of this work was to verify the minimum period of ripening of the artisanal Minas cheese from the Canastra Mountain Range, on the basis of the microbiological criteria demanded by the State Law N. 14,185 from 31st January, 2002, specific for artisanal cheeses. It was evaluated the microbiological and physicochemical characteristics during 64 days
Publicado em: 2007
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12. "MEDIDAS DE ESPALHAMENTO ELÁSTICO RESSONANTE 17O + p" / "MEASUREMENTS OF RESONANT ELASTIC SCATTERING 17O + p"
Foram medidas distribuições angulares do espalhamento elástico 17O + p e da reação de transferência p(17O,a)14N nas energias ECM = 1,39 e 2,33 MeV. Foi utilizado feixe de 17O produzido no Laboratório Pelletron, com energias de 25 e 42 MeV. As medidas foram efetuadas utilizando-se alvos plásticos de mylar aluminizado (C10H10O4) e polietileno (CH2) com
Publicado em: 2006