Dispersive Transport
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Comparison of 1D and 3D reservoir heat transport models and temperature effects on mass transport
RESUMO Modelos 1D e 3D de transporte de calor são comparados em um reservatório dentrítico no Brasil. Os períodos de estratificação para ambos modelos foram estimados usando índices físicos e gradientes de temperatura. O modelo tridimensional reproduz a temperatura da coluna d'água com mais acurácia, no entanto, o cálculo de índices físicos (nú
RBRH. Publicado em: 01/07/2019
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2. Removal of Cd+2 from aqueous solutions onto polypyrrole coated reticulated vitreous carbon eletrodes
The development of simple methods for removal of heavy metals from aqueous samples is a relevant field of research. In this connection, the electrodeposition of the Cd+2 ion, one of the most toxic species for animals and human beings, was investigated in aerated pH 4.8 sulfuric-sulfate solutions. In potentiostatic conditions, the maximum rate of cadmium depo
Publicado em: 2010
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3. Study of oxygen reduction reaction in acidic media on platinum and palladium electrocatalysts supported on carbon / Estudo da reação de redução de oxigênio em meio ácido em eletrocatalisadores de platina e paládio dispersos em carbono
Oxygen reduction reaction (ORR) on platinum-palladium electrocatalysts supported on carbon was studied in H2SO4 electrolyte. The structure of the catalysts was characterized by XRD (X-ray diffractometry) and the composition was determined by EDX (Energy dispersive X-ray spectroscopy). The electronic properties were investigated by in situ XAS (X-ray absorpti
Publicado em: 2009
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4. Estudo do comportamento de corrosão dos intermetálicos presentes na liga AA 2024-T3, por meio de técnicas de microscopia associada a técnicas eletroquímicas / INVESTIGATION ON THE CORROSION BEHAVIOUR OF THE INTERMETALLICS IN THE AA 2024-T3 ALLOY BY MICROSCOPY ASSOCIATED TO ELECTROCHEMICAL TECHNIQUES.
The AA2024-T3 aluminium alloy is largely used in the aerospace industry. It has high mechanical properties due to the presence of alloying elements, mainly copper, that form finely distributed precipitates coherent with the matrix, during controlled aging treatment. However, during this process, large intermetallics (IMs) are also formed with composition and
Publicado em: 2008
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5. Simulação numérica para difusão anisotrópica / Numerical simulation to anisotropic diffusion
The present work build a computational model using the finite volumes method for unstructured meshes, with the purpose of calculating the hydraulic load in a porous medium, considering it material non - homogeneous and anisotropic. The Anisotropy is a characteristic of many materials found in the nature and it depends on the property studied in this material
Publicado em: 2006
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6. Propriedades estruturais, microestruturais e supercondutoras de Ca0,5LaBa1,5[(CuO)1-x(MS)x]3O4-Â com M=Zn e Ni
Since their discovery doping and substitution studies of high temperature superconductors (HTSC) oxides have attracted attention of many researchers. These studies have contributed to the understanding of the superconductivity in these compounds. Studies of 3d -metal doping of HTSC have shown that it is possible to obtain an improvement in the critical curre
Publicado em: 2004
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7. Removal of Cd+2 from aqueous solutions onto polypyrrole coated reticulated vitreous carbon eletrodes
The development of simple methods for removal of heavy metals from aqueous samples is a relevant field of research. In this connection, the electrodeposition of the Cd+2 ion, one of the most toxic species for animals and human beings, was investigated in aerated pH 4.8 sulfuric-sulfate solutions. In potentiostatic conditions, the maximum rate of cadmium depo
Materials Research. Publicado em: 2001-07
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8. The role of the rheological properties of non-newtonian fluids in controlling dispersive mixing in a batch electrophoretic cell with Joule heating
The problem of the effect of Joule heating generation on the hydrodynamic profile and the solute transport found in electrophoretic devices is addressed in this article. The research is focused on the following two problems: The first one is centered around the effect of Joule heating on the hydrodynamic velocity profile and it is referred to as "the carrier
Brazilian Journal of Chemical Engineering. Publicado em: 2001-03
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9. A study of dispersive charge transport in dieletrics. / Estudo de transportes dispersivos em dielétricos.
O contínuo Tempo Randon Walk desenvolvido por Scher e Montroll é generalizado a fim de incluir as transições de taxas de espaço e o tempo. Tomando o limite contínuo, no passeio de equações aleatórias, uma equação geral de uma carga espacial transportada é obtida. A equivalência entre hopping e transporte através de estados expandidos com armadi
Publicado em: 1979
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10. Chaotic mixing deep in the lung
Our current understanding of the transport and deposition of aerosols (viruses, bacteria, air pollutants, aerosolized drugs) deep in the lung has been grounded in dispersive theories based on untested assumptions about the nature of acinar airflow fields. Traditionally, these have been taken to be simple and kinematically reversible. In this article, we appl
The National Academy of Sciences.
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11. Biosorption of dichlorodiphenyltrichloroethane and hexachlorobenzene in groundwater and its implications for facilitated transport.
The potential for enhanced mobility of hydrophobic pollutants by cotransport with bacteria in saturated soils was evaluated from measurements of biosorption of 14C-labeled hexachlorobenzene and dichlorodiphenyltrichloroethane (DDT) to five strains of soil and sewage bacteria. The sorption process could be described by a linear partition equation and appeared
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12. Identification of a New Glucosinolate-Rich Cell Type in Arabidopsis Flower Stalk
Distribution of K, Ca, Cl, S, and P in freeze-dried sections of Arabidopsis flower stalk was analyzed by energy dispersive x-ray imaging. Concentrations of these elements in different cell types were quantified by microanalysis of single-cell samples and phloem exudates. Results showed a differential pattern of distribution for all five elements. K concentra
American Society of Plant Physiologists.