Results 291 to 300 of about 8,075,923 (324)

Diffusion Isotope Effects in Isotope Mixtures

Berichte der Bunsengesellschaft für physikalische Chemie, 1972
AbstractThe tracer diffusion of deuterium and tritium in the β‐phase of PdHn has been measured by means of special techniques, the time lag method with mass spectrometer or counter tube as detector, and the decay function of isotope exchange. It has been found that D atoms as tracer in β‐PdHn, i.e.
B. Bonn, E. Gans, G. Sicking, E. Wicke
openaire   +1 more source

Explaining Effective Diffusivities within Diffusive Oceanic Staircases

1988
Abstract Before parameterizing double-diffusive fluxes as functions of large-scale vertical gradients of S and T we must first parameterize the thickness H of the layers within the staircases.It has been shown (Kelley, 1984) that is possible for diffusive-case thermohaline staircases: oceanographic variability in H is collapsed onto a ...
openaire   +1 more source

Inertial effects and diffusion

Journal of Non-Crystalline Solids, 2004
Abstract Fick’s law of diffusion is equivalent to an equation of motion for an ideal substance in which the thermodynamic driving force is assumed to be balanced by a drag force proportional to drift velocity. Neglect of the inertial force required by Newton’s second law leads to anomalous short-time predictions such as infinite speeds of propagation.
openaire   +1 more source

Isotope Effect in Diffusion

Physical Review, 1969
A derivation of the classical jump rate $\ensuremath{\Gamma}$ for tracer diffusion aimed at a clear expression for the mass dependence of the frequency factor $\overline{\ensuremath{\nu}}$ is presented. The derivation is effected without using the usual collective normal coordinates which usually combine the masses in a complicated way.
openaire   +1 more source

Self-diffusion, Solute Diffusion, Diffusion in Ionic Crystals and Correlation Effects

2015
Self-diffusion, solute diffusion, diffusion in ionic crystals and correlation effects are the topic of this chapter. Ionic crystals are included in this chapter since many, if not all, ceramics have some iconicity in their nature. Unlike pure metals, ceramics include at least two different species, such that vacancy formation is not of a single ...
openaire   +1 more source

Diffusion of Intervention Effects

Journal of Adolescent Health, 2016
Dennis M. Gorman, John S. Searles, Scott E. Robinson   +2 more
openaire   +2 more sources

The Cooperative Diffusion Effect

Journal of Applied Physics, 1966
The mechanisms governing the abnormal diffusion of base dopant impurities (boron and phosphorus) in shallow double-diffused structures in silicon have been investigated. The cooperative diffusion effect is manifest in an enhanced or retarded penetration of the base region beneath a diffused emitter. The enhanced diffusion of acceptors in npn structures
openaire   +1 more source

effective diffusivity

Catalysis from A to Z, 2020
H. Kral
semanticscholar   +1 more source

A Versatile Effective Thermal Diffusivity Model for Porous Materials

International journal of thermophysics, 2021
J. Carson
semanticscholar   +1 more source

Effective Diffusivity of Porous Materials with Microcracks: Self-Similar Mean-Field Homogenization and Pixel Finite Element Simulations

Transport in Porous Media, 2018
J. Timothy, G. Meschke
semanticscholar   +1 more source