Oxygen transport through dense La0.6Sr0.4Fe0.8Co0.2O3-d perovskite-type permeation membranes
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Light propagation in two-layered turbid media having an infinitely thick second layer is investigated in the steady-state, frequency, and time domains. A solution of the diffusion approximation to the transport equation is derived by employing the extrapol ...
Ag aggregation on Ag(111), Pt(111), and 1 ML Ag pseudomorphically grown on Pt(111), has been studied with variable temperature STM. These systems all have in common that dendritic patterns with trigonal symmetry rather than randomly ramified aggregates, wh ...
A one-step procedure for the preparation of ion-selective membranes is described. The method employs the thermally induced gel crystallization of ultrahigh molecular weight poly(ethylene) (UHMW-PE) from a dilute xylene solution. After evaporation of the xy ...
In a recent paper we measured the lateral hole diffusion in a GaAs/AlGaAs single quantum well (SQW) by a novel method. At helium temperature, we estimate a lateral hole diffusion length in the QW of 1.5 mum. However, the assumption that diffusion takes pla ...
Although a rigorous definition of growth-limiting substrate relies on a kinetic anal., a simple stoichiometric anal. based on the calcn. of the conversion is more applicable. Anal. of single and dual limitations is based on a simulated example for a substr ...
A new method was presented to investigate the interactions between membrane receptors and their ligands in an artificial, reconstituted membrane system. Lipid bilayers were anchored via covalently attached thiolipids to TiO2/SiO2 waveguide surfaces to prod ...
We present a critical view of the analysis of experimental island densities acquired as a function of temperature in terms of barriers and prefactors for tracer diffusion at surfaces. We investigate the achievable precision for methods ranging from simple ...
Bubble-free aeration is applied in animal cell culture processes for oxygenation to avoid shear stress and foaming assocd. with direct sparging into the culture. Oxygen mass transfer across PTFE-membranes was detd. in three different reactor systems that m ...
The feasibility of removing water from azeotropic mixts. is explored. Although the selectivity of membrane distn. processes is largely detd. by vapor liq. equil. (VLE), differences in diffusion rates across the membrane and an eventual addnl. gas gap may s ...
Insertion of some protein toxins into membranes proceeds through an unfolding step. The unfolding trigger can be the low pH in endosomes, exposure to body temperature, reduction of disulphide bonds or proteolytic cleavage occurring at the membrane surface. ...