Mobility molecular transport

To summarize, the time needed to cross the border, that is, the border transfer velocity, depends on both the individual mobility on foot (diffusivity) and the quality of the roads (viscosity). Or stated differently the distance from the border where the passengers leave the taxi since the speed of the cars (water movement) drops below the speed of the individual pedestrian (molecular transport), depends on the relative size of pedestrian mobility and car mobility. Transfer velocities are large for fast runners and permeable road systems and small for physically handicapped passengers and narrow streets. 

Together with proteins, phospholipids are the most important structural components of biological membranes. Since mobility of the lipid segments fa vors molecular transport through a membrane and thereby increases its permeability, a marked increase in 7] along a lipid-fatty acid chain also reflects a more efficient molecular diffusion through the lipid layer of a membrane [175]. 

The phase terms Mk2 in (1.2.4) refer to quadratic field profiles. Such a profile is encountered in good approximation in single-sided NMR, for example with the NMR-MOUSE (Mobile Universal Surface Explorer, cf. Section 9.3.4) [Blii6]. Use of nonlinear field profiles appears to be restricted to exceptional cases nevertheless, it also provides access to molecular transport parameters by appropriate manipulation of the moments of FAt) = d B,(t)/dx2. 

Figure 13 displays the self-diffusivities of n-hexane and 2-methylpentane in silicalite-1 and H-ZSM-5 as a function of the ratio of the hydrocarbons. The self-diffusivities of both hexanes linearly decrease with increasing gas-phase fraction of the branched hexane in the gas phase for the non-acidic and acidic zeolite. In H-ZSM-5, the mobility of alkanes is approximately two times slower than in silicalite-1. Obviously, the presence of acid sites strongly affects the molecular transport due to stronger interactions with the n-hexane molecules. A similar effect of Bronsted sites on the single component diffusion of aromatics was observed in MFI zeolites with different concentration of acid sites [63-65]. The frequency response (FR) technique provided similar results... 

Additive molecular mobility and transport in the presence of plasticizers... 

ADDITIVE MOLECULAR MOBILITY AND TRANSPORT IN THE PRESENCE OF PLASTICIZERS... 

Mass Transfer Efficiency. The human kidney acts as a filter to remove metabolic waste products from the blood. A person s kidneys process about 200 quarts of blood daily to remove two quarts of waste and extra water, which are converted into urine and excreted. Without filtration, the waste would build to a toxic level and cause death. Patients with kidney failure may undergo dialysis, in which blood is withdrawn, cleaned, and returned to the body in a periodic, continuous, and time-consuming process that requires the patient to remain relatively stationary. Portable artificial kidneys, which the patient wears, filter the blood while the patient enjoys the freedom of mobility. Filtration systems may involve membranes with a strict pore size to separate molecules based on size or columns of particle-based adsorbents to separate molecules by chemical characteristics. Mass transfer efficiency refers to the quality and quantity of molecular transport. 

Research on industrial areas such as organic light-emitting devices, photovoltaics, and thin film transistors involves investigations about LCs due to their high carrier mobilities, anisotropic transport, and polarized emission resulting from their self-assembling properties and super-molecular structures. 

In the above consideration it has been tacitly assumed that the charge carrier mobility docs not depend on the electric field. This is a good approximation for molecular crystals yet not for disordered systems in which transport occurs via hopping. Abkowitz et al. [37] have solved that problem for a field dependence of ft of the form p-po (FIFU) and trap-free SCL conduction. Their treatment predicts... 

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