Results 271 to 280 of about 4,529,073 (321)

Fractional Diffusion with Time-Dependent Diffusion Coefficient

Reports on Mathematical Physics, 2021
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Costa, F. S., de Oliveira, E. Capelas, Plata, Adrian R. G.   +2 more
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Diffusion coefficients

The Journal of the Acoustical Society of America, 1998
For nearly a century, the absorption coefficient has been used as a measure for the amount of energy lost when sound reflects from a surface. There is now a need for a diffusion coefficient which measures the angular distribution of the reflected energy.
Tristan J. Hargreaves, Trevor J. Cox, Y. W. Lam, Peter D’Antonio   +3 more
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Diffusion coefficients of retinoids

Current Eye Research, 2002
Diffusion coefficients of various retinoids have not been measured previously. It is important to know the diffusion coefficients of the retinoids because this property might be rate-limiting in dark adaptation. Also, retinoid diffusion is important to explore given that rhodopsin regeneration is not impaired in IRBP knockout mice.Measurements of ...
Christopher S, Dodson, Andrey V, Peresypkin, Kalpana, Rengarajan, Shaoxiong, Wu, John M, Nickerson   +4 more
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Diffusion coefficient in photon diffusion theory

Optics Letters, 2000
The choice of the diffusion coefficient to be used in photon diffusion theory has been a subject of discussion in recent publications on tissue optics. We compared several diffusion coefficients with the apparent diffusion coefficient from the more fundamental transport theory, D(app).
Graaff, R, Ten Bosch, JJ
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Gaseous Diffusion Coefficients

Journal of Physical and Chemical Reference Data, 1972
Diffusion coefficients of binary mixtures of dilute gases are comprehensively compiled, critically evaluated, and correlated by new semi-empirical expressions. There are seventy-four systems for which the data are sufficiently extensive, consistent and accurate to allow diffusion coefficients to be recommended with confidence. Deviation plots are given
T. R. Marrero, E. A. Mason
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Determination of thermal diffusion coefficient and diffusion coefficient

Journal of Crystal Growth, 1977
Abstract A new technique is described to determine the thermal diffusion coefficient, D', and the difusion, D, of Fe, Si and Al in liquid Mg. This technique is based on a boundary condition, formulated by including contributions of temperature and cocentration gradients in the liquid to the advancing solid-liquid interface during unidirectional ...
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Diffusion Constant and Diffusion Coefficient

Science, 1955
Max Kleiber, P. Brandt Rehberg
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Phase-diffusion coefficients and phase-diffusion rate

Physical Review A, 1990
We point out that the phase-diffusion rate in an amplifier or attenuator is not proportional to the phase-diffusion coefficient in the Glauber P nor the antinormal-ordering Q distribution. It is only proportional to the phase-diffusion coefficient in the Wigner (W) distribution.
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Diffusion Coefficients of Metabolites

2001
The conversion rate of most immobilized cells depends not only on the availability of substrates and microbial kinetics, the diffusion rate of metabolites through the immobilized cell system is of major importance as well. Therefore, characterization of the internal mass transfer properties may be considered essential for the modelling, design and ...
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Thermodynamic Diffusion Coefficients

Defect and Diffusion Forum, 2008
A new form of diffusion coefficient termed as thermodynamic diffusion coefficient is introduced in this paper. Conventionally, diffusion coefficients are evaluated using concentration gradient as driving force. But truly, chemical potential gradient is the actual driving force that determines the material flow in any part of the system.
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