diffusion coefficient

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diffusion coefficient

or

diffusion constant

n
(General Physics) the rate at which a diffusing substance is transported between opposite faces of a unit cube of a system when there is unit concentration difference between them. Symbol: D Also called: diffusivity
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Where intraparticle diffusion constant is represented by ki and C gives an idea of the degree of the boundary layer thickness.
reported that atypical and malignant meningiomas tend to be markedly hyperintense on diffusion-weighted MR images and exhibit marked decreases in the diffusion constant ( D [sub]av) or apparent diffusion coefficient values when compared with normal brain parenchyma.
During homogenization process, effective diffusion constant and effective reaction rates as summarized in table- 2.
Depending on the diffusion constant of an analyte, the system becomes equilibrated in a matter of minutes," says Wheeler, explaining that passive diffusion does all the work.
In true, it is an imaginary diffusion constant because there is no effective dislocation of matter in all directions (this is a single-particle description).
Bulk water diffusion is characterized by one constant, the apparent diffusion constant (ADC).
p] is the overall diffusion constant, and C is an empirical constant and would represent ion released from surface sites at t = 0 provided that it be a positive value (Jopony and Young 1987).
It increases the diffusion rate of oxygen into the polymer via the temperature dependence of the diffusion constant D
varies]] = mass of fluid that could possibly diffuse into the seal at time = infinity; R = outer maximum radius of the seal; r = the radius of the diffusing fluid front at any time t; D = the diffusion constant for the fluid; [alpha] = a constant; and [J.
Adapted from Paul and Clark, 1996) Diffusion Constant ([cm.
infinity]] is the mass of ammonia available, 1 is the thickness of the film, and D is the diffusion constant.

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