Now showing items 41-50 of 1444
Effective diffusion coefficients behavior in osmotic dehydration of apple slices considering shrinking and local concentration dependence
(Blackwell Publishing, 2008-04-01)
The mass transfer during osmotic dehydration of apple slices immersed in 40, 50 and 60% (w/w) aqueous sucrose solutions was investigated to evaluate the influence of solution concentration on diffusivities. In the mathematical ...
Diffusion analysis of one photosensitizer in bovine teeth using fluorescence optical imaging
(Spie - Int Soc Optical Engineering, 2012-01-01)
Some photosensitizers (PSs) used for PACT (Antimicrobial Photodynamic Therapy) show an affinity for bacterial walls and can be photo-activated to cause the desired damage. However, on dentine bacterias may be less susceptible ...
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient
(Public Library Of Science, 2014-04)
The gradient of Bicoid (Bcd) is key for the establishment of the anterior-posterior axis in Drosophila embryos. The gradient properties are compatible with the SDD model in which Bcd is synthesized at the anterior pole and ...
Quantum statistics of classical particles derived from the condition of a free diffusion coefficient
(American Physical Society, 2016-12)
We derive an equation for the current of particles in energy space; particles are subject to a mean-field effective potential that may represent quantum effects. From the assumption that noninteracting particles imply a ...
Rescaling of diffusion coefficients in two-time scale chemical systems
(American Institute of Physics, 2000-12)
We study reaction-diffusion systems which involve processes that occur on different time scales. In particular, we apply a multiscale analysis to obtain a reduced description of the slow dynamics. Under certain assumptions ...
Effect of particle-hole symmetry on the behavior of tracer and jump diffusion coefficients
(Amer Physical Soc, 2013-05)
This paper analyzes the effect of particle-hole symmetry on the behavior of the tracer diffusion coefficient as well as the jump diffusion coefficient. The coefficients are obtained by performing a random walk of individual ...
Isothermal sintering kinetic of 3YTZ and 8YSZ: Cation diffusion
We have studied the sintering kinetic of 3 and 8 mol% of yttria stabilized zirconia under isothermal conditions. Sintering was performed in the temperature range between 1200 and 1450 °C. The sintering kinetic process was ...
Diffusion coefficient of K+ in ion exchanged glasses calculated from the refractive index and the Vickers hardness profiles
(Elsevier B.V., 2006-09-15)
The top faces of float glass samples were exposed to vapors resulting from the decomposition of KNO3 at 565 degrees C for up to 32 h. X-ray dispersive spectra (EDS) show that K+ ions migrate into the glass. The K+ concentration ...
Stability analysis of Crank-Nicolson and Euler schemes for time-dependent diffusion equations
In this paper, we study the stability of the Crank-Nicolson and Euler schemes for time-dependent diffusion coefficient equations on a staggered grid with explicit and implicit approximations to the Dirichlet boundary ...
CITT and inverse analyses applied to the study of the mushroom drying process
(Elsevier Sci LtdOxfordInglaterra, 2010)