The c is conductance or diffusivity
function and it must be close to 1 in each region and 0 at the edge of the image, I(x,y).
In this way, the lipid content works as a limiting factor during the drying process, acting as a physical barrier to heat transfer, which is responsible for water evaporation as well as its diffusivity
from the interior to the surface of the food.
FSL's dtifit tool was used to generate a diffusion tensor model that was fit at each voxel and thereafter used to generate maps for each of the diffusivity
measures (MDs, axial diffusivity
, radial diffusivity
[RD], and FA).
Calculation of Effective Moisture Diffusivity
. Weibull distribution can be used to calculate the effective moisture diffusivity
, regardless of the characteristics of moisture migration during drying process.
The intercept of the straight line fitting the measured pressure data with the time axis, according to (4), defines a parameter called time lag given by [[tau].sub.lag] = [L.sup.2]/6 D: this characteristic time is a measure of the lasting of transient transport conditions and permits the evaluation of the gas diffusivity
Recently, some techniques have been developed for measuring and elucidating the thermal conductivity and thermal diffusivity
of nanofluids [15-17], as well as observing the influence of particle nanostructures on their thermal properties.
The specimens for the test of CET, thermal diffusivity
, and conductivity were machined with two orthogonal orientations, specimen length in the axial and transverse directions.
The photothermal technique employed in this work to measure the thermal diffusivity
is the time-resolved mode-mismatched dual-beam thermal lens technique, which is based in the thermal lens effect.
The shape of the C(z) profile, for a specified hydrogen concentration at the sample surface, depends  on a single material parameter [D.sup.+]K where [D.sup.+] is the diffusivity
Since microbial biofilms can significantly affect the hydrodynamics (porosity, permeability, diffusivity
, etc.) of a porous medium, cf.
DTI analysis revealed a significant increase in mean, radial, and axial diffusivity
, mainly of the fibers of bilateral anterior thalamic radiation and superior longitudinal fasciculus with left predominance, which intersected with bilateral subinsular white matter (P < 0.05).