Migration regime

Migrational regime, when electric fields are applied... 

Figure 2 Schematic view of DNA migration regimes (A) Ogston sieving (B) biased reptation and (C) reptation with permanent stretching. Rg - radius of hydrodynamic equivaient sphere of DNA coii S - average mesh size.

Migration regime with Vp Vp Uj. 0 assumes very slow crystal growth. If the diffusion proceeds quicker than the growth, solution of these stationary conditions leads [47,141] to the logarithmic distribution law. 

A diffusion pump needs a forepump (usually a rotary pump). Oil can also migrate from the forepump into the vacuum chamber through the diffusion pump, when the rotary pump works in the molecular regime ( 10 2torr). 

Cage Effect in Solid Polymers Migration of Free Valence in Solid Polymers Initiated Polymer Oxidation Diffusion of Dioxygen in Polymer Diffusion Regime of Polymer Oxidation Isomerization of Alkyl and Peroxyl Radicals of Polypropylene... 

The extrinsic case applies at low temperatures or large doping levels. The site fraction of cation vacancies is equal to the solute-atom site-fraction and is therefore temperature independent. In the extrinsic regime, no thermal defect formation is necessary for cation self-diffusion and the activation energy consists only of the activation energy for cation vacancy migration. 

An Arrhenius plot of the cation self-diffusivity will then possess two linear regions. In the high-temperature intrinsic regime, the slope will be — Hg/3 + Hm)/k in the low-temperature extrinsic regime, the slope will be simply Hm/k, where Hm is the migration enthalpy of a cation vacancy. 

Fig. 4.9. Discrimination of migration-controlled reactions [81]. D - diffusion (x < 1), I - intermediate regime (lies between abscissa axis and full line), and H - hopping reaction (below this line). The cases r = const and D = const are marked by lines--------------------------------and---------— respectively.

When Rgdiffusion coefficient, Df. is described by the Zimin Model (Doi and Edwards, 1986). 

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