Results 281 to 290 of about 5,522,348 (307)

Nonadiabatic Effects in Hydrogen Diffusion in Metals*

Zeitschrift für Physikalische Chemie, 1992
Molecular dynamic simulations for hydrogen diffusion in Pd are perfomed, using a potential based on the embedded-atom method. It is found that a single adiabatic Born-Oppenheimer potential energy surface cannot reproduce the wave-vector dependence of the quasielectric peak obtained in neutron scattering studies.
, Li, , Wahnström
openaire   +2 more sources

A review of experimental measurements of effective diffusive permeabilities and effective diffusion coefficients in biofilms

Biotechnology and Bioengineering, 1998
Experimental measurements of effective diffusive permeabilities and effective diffusion coefficients in biofilms are reviewed. Effective diffusive permeabilities, the parameter appropriate to the analysis of reaction-diffusion interactions, depend on solute type and biofilm density.
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Effect of Diffusion on Dispersion

SPE Annual Technical Conference and Exhibition, 2008
AbstractWe study dispersion in porous media by tracking movement of a swarm of solute particles through a physically representative network model. We developed deterministic rules to trace paths of solute particles through the network. These rules yield flow streamlines through the network comparable to those obtained from a full solution of Stokes ...
Raman K. Jha, Steven L. Bryant, Larry W. Lake   +2 more
openaire   +1 more source

Measurements of the effect of molecular diffusivity in turbulent diffusion

Journal of Fluid Mechanics, 1960
Townsend (1954) has shown that turbulent vorticity may rotate and strain a diffusion wake, thereby increasing the contribution of molecular diffusion to the total mean dispersion over short diffusion times. To test whether any such effect occurs at longer diffusion times, the lateral dispersion of both helium and of carbon dioxide in air were measured ...
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Effects of differential diffusion on unsteady diffusion flames

International Communications in Heat and Mass Transfer, 1998
The effects of differential diffusion on unsteady diffusion flames are considered for one-dimensional geometries. A Stefan problem is obtained for a single planar flame separating two semi-infinite regions containing fuel and oxidizer. Non-unity diffusivity ratio and the stoichiometry affect strongly the flame evolution and determine the conditions to ...
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Diffusion of Intervention Effects

Journal of Adolescent Health, 2016
Dennis M. Gorman, John S. Searles, Scott E. Robinson   +2 more
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The Effect of Diffusion Potentials on Facilitated CO2 Diffusion

1980
Bicarbonate-facilitated CO2 transport is, as described elsewhere in this section, of long-standing biological and industrial interest. It can be said to date back at least half a century to A.V. Hill’s (1928) comment on August Krogh’s (1918–1919) measurements of tissue O2 and CO2 permeabilities: “It seems rather curious that the larger molecule should ...
openaire   +1 more source

Effective moisture diffusivity and drying simulation of walnuts under hot air

International Journal of Heat and Mass Transfer, 2020
Zhongli Pan, Weipeng Zhang, Chang Chen
exaly  

Prediction of effective diffusivity of porous media using deep learning method based on sample structure information self-amplification

Energy and AI, 2020
Ying Yin, Z G Qu
exaly  

Combined effect of substrate concentration and flow velocity on effective diffusivity in biofilms

Water Research, 2000
Haluk Beyenal, Zbigniew Lewandowski
exaly