diffusion gradient

diffusion gradient

[də′fyü·zhən ‚grād·ē·ənt]
(physics)
The graphed distance of penetration (diffusion) versus concentration of the material (or effect) diffusing through a second material; applies to heat, liquids, solids, or gases.
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we aimed to test whether the geographic diffusion gradient evident for prazosin prescribing reflected regional variations in the delivery of other PTSD pharmacotherapy care as measured by three quality prescribing indicators: (1) SSRI/SNRI use, (2) benzodiazepine use, or (3) minimal threshold prazosin daily dosing.
Second, we hypothesized that the geographical diffusion gradient of prazosin would be inversely correlated with benzodiazepine use, presumably because prazosin is a more selective and effective agent for PTSD-related symptoms (e.
Contract notice: Delivery: 1 piece petrofizycznego mri scanner; diffusion gradient system; set to simulate the conditions of deposit; system and the mri scanner; imaging gradient system; imaging software for 1d, 2d and 3d, and to analyze the petrophysical parameters.
1Delivery: Scanner petrofizycznego NMR diffusion gradient system, set up to simulate the conditions of deposit and imaging software for the analysis of 1D and petrophysical parametersTask No.
3) Essentially, DWI uses the application of a diffusion gradient to make the MRI signal sensitive to the amount of diffusion that occurs parallel to the direction of the diffusion gradient.
A cross flow/secondary force is applied to the channel that creates a diffusion gradient, which moves larger particles toward the wall.
Plasma imbibition is the passive exchange of nutrients across a diffusion gradient.
S_0 is the signal intensity when no diffusion gradients are used.
Research on optimal operation of a CC/DV system assumed that the thermal plume stratification height (fresh-zone height) coincides with the pollutant stratification height, on the basis that both the heat source and carbon dioxide have the same origin and both are transported by velocity and diffusion gradients (Mossolly et al.
Diffusion tensor imaging was performed with a modified 2-dimensional dual spin echo type echo planar imaging acquisition window and two pair of diffusion gradients symmetrically positioned around each 180[degrees]-radiofrequency pulse with ramped sampling read-out gradients.
Unlike the microscope, which has only one focus/unfocus direction, the scanner can focus and refocus in multiple dimensions by applying diffusion gradients in different directions.
Sets of DW-EPI images are collected with diffusion gradients applied sequentially along at least 6 predetermined directions.
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