Migration phenomenon

Jensen, B. S. RIS-Report on Critical review of available information on migration phenomena of radionuclides into the geosphere, 1981. 

It is not overly difficult to include the effects of interconversion of hydrogen among its charge states if these are equilibrated with the local carrier concentrations and if we continue to neglect complex formation and assume that the spatial scale of the diffusion-migration phenomena is large... 

A possible (so far unjustified) enhancement of the polymer concentration within pores due to molecular migration phenomena. The enhanced pore concentration may result in greater partitioning into the very small pores and in the increased retention volumes. 

Brunn PO (1984) Polymer migration phenomena based on the general bead-spring model for flexible polymers. J Chem Phys 80 5821-5826 Bueche F (1956) Viscosity of polymers in concentrated solutions. J Chem Phys 25 599-600 Chandrasekhar S (1943) Stochastic problems in physics and astronomy. Rev Modern Phys 15(l) l-89... 

B.S. Jensen, Migration Phenomena of Radionuclides into the Geosphere, Harwood Acad. Publ., 1982. 

Tikhonov, Valentin, Russia s Atomic Cities Migration Phenomena, Nuclear Proliferation Journal, Carnegie Moscow Center, No. 28, February 1999. 

In the three sections below we consider important areas of applications of ESCA in migration phenomena, in the synthesis of polymer surfaces by means of plasma techniques and in reactions initiated at the surface of cotton fibrils in the nitration of cellulose. 

Figure 8. Migration phenomena possible extremes for migration of low-molecular...

Embery, G. and Dugrad, P. H. The isolation of DMSO soluble components from human epidermis preparations A possible mechanism of action of dimethylsulf-oxide in effecting percutaneous migration phenomena. Journal of Investigative Dermatology 57 308-311, 1971. 

There is independent physical evidence for non-uniform distribution and restriction from transmembrane diffusion of a-Toc in lipid membranes. Differential scanning calorimetry results indicated that it partitioned into the most fluid domains in lipid vesicles. Fluorescence studies showed that a-Toc has a very high lateral diffusion rate in egg lecithin but it does not take part in transbilayer (flip-flop) migration even over many hours . It is not known if this behavior of a-Toc extends to natural biomembranes where actual structures and conditions may dramatically change migration phenomena. 

As before, the whoie eiectroiyte is the seat for diffusion and migration phenomena after a transient period. Uniike the previous cases, both interfaces are reactive for the eiectroiyte ions. However, the fact that the two eiectrode haif-reactions are different means that different stoichiometries appear in the equations, with therefore different siopes on each side as a resuit of appiying Faraday s iaw. Here again, one cannot obtain a non-zero steady-state current. 

This means that, at steady state, all of the current is carried by the cations, with a half/half distribution of migration and diffusion contributions. This example underlines the difference between the electrochemical transport number and the usual transport number, when the different migration phenomena can be assumed as the only significant phenomena ... 

When the current is low compared to the limiting current, the profile is quasi-linear, as in the case of pure migration phenomena ... 

This means that the entire current is carried by the Ag ions, as in the case with no supporting electrolyte. In the example studied here almost all of the current is due to diffusion. This value corresponds to the electrochemical transport number. If it were possible to consider the migration phenomena as being the only relevant one, then usual transport numbers would be obtained ... 

In phospholipid investigations, P NMR spectra have been used to study micelle formation and to determine pA values. Migration phenomena in lysophospholipids can be studied [87]. 

FIGURE 9.8 Migration phenomena under pH changes in the SIRs based on reactive supports. 

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