Mass Transport Physics
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Development of an Acquisition System and Data Analysis for Measurements of Electron Transport Parameters in Gases / Desenvolvimento de sistema de aquisição e tratamento de dados para medidas de parâmetros de transporte de elétrons em gases
This thesis describes a pulsed Townsend experiment whose purpose was to obtain experimentally the transport parameters of electron in gases, particularly nitrogen and isobutane, within a range of reduced electric field between 130 Td and 210 Td. The transport parameters obtained were the average speed of center of mass of the electron cloud, the ionization r
Publicado em: 2010
-
2. Desempenho de plantas de cobertura no controle da erosão hídrica no Sul de Minas Gerais / Performance of cover crops to control erosion in the South of Minas Gerais
The erosion initiates with the impact of the raindrop on the soil surface, causing the transport of sediment, nutrients and organic matter. To reduce this erosion, the use of conservation practices, such as proper management and planting of cover crops that reduce these losses, is essential. The objective of this study was to evaluate the potential of plant
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2009
-
3. Uma nova abordagem numérica para a injeção de traçadores em reservatórios de petróleo / A new numerical approach for the injection of tracers in petroleum reservoirs
The injection of tracers are used in the investigation of ows in heterogeneous porous media, in studies related to the simulation of miscible dispacements in petroleum reservoirs and the dispersion of contaminants in aquifers. In this work we present new algorithms for the numerical approximation of tracer injection problems. We discuss recent developments o
Publicado em: 2008
-
4. Teoria de cojuntos fuzzi no estudo da dinamica da agua e de solutos no solo / Fuzzi sets theory applied in the soil s water and solutes dynamics
Conhecer a dinâmica da água e de solutos no solo é condição imprescindível para a produção agrícola sustentável. O sucesso destes modelos numéricos em descrever a dinâmica da água e de solutos no solo está intimamente ligado à precisão com que os parâmetros físicohídricos, envolvidos nestes processos são determinados. De uma maneira geral
Publicado em: 2007
-
5. Magnetotransport and Hall ferromagnetism in magnetic semiconductor heterostructures / Magneto-transporte e ferromagnetismo Hall em heteroestruturas semicondutoras magnéticas
Digital magnetic heterostructures (DMHs) are semiconductor structures with magnetic impurities (Mn) restricted to some planar arrangements (monolayers) regularly spaced. In the presence of an external magnetic field, the sp-d exchange interaction between the localized magnetic moments and the itinerant carriers is responsible for a giant spin splitting, of t
Publicado em: 2004
-
6. Non-newtonian carriers in a batch electrophoretic cell with joule heating: hydrodynamic considerations and mathematical aspects
The Joule heating effects on hydrodynamics are examined for the case of a non-Newtonian fluid flowing in a batch electrophoretic cell. The potential benefits of using non-Newtonian fluids in electrophoretic separations could lead, for example, to an increase in the efficiency of separations and to a better scale-up of the operation for the processing of larg
Brazilian Journal of Chemical Engineering. Publicado em: 2001-03
-
7. Modelling of the transport phenomena in the gas circuit of a triple fluid ( N H IND. 3 - H IND. 2 O - H IND.2 absorption refrigeration system / Modelagem dos fenomenos de transporte no circuito de gas de um sistema de refrigeração por absorção de amonia com hidrogenio como gas inerte
This work presents a simulation of the flow, heat and mass transfer of a gaseous ammonia hydrogen mixture in natural convection inside an absorption reftigeration system with inert gas. The transport phenomena involved in each equipment ofthe circuit were described by the conservation equations of mass, momentum, energyand chemicalspecies. By using the bound
Publicado em: 1996
-
8. Outlining social physics for modern societies—locating culture, economics, and politics: The Enlightenment reconsidered
A groundwork is laid for a formulation of the modern human social system as a field continuum. As in a simple material physical field, the independent implied relationships of materials or processes in flux have to be based on local conservations of mass, energy, and momentum. In complex fields, the transport fluctuations of momentum are transformed into act