The transport of pure gases and of binary gas mixtures through a microporous composite membrane is discussed. The membrane consists of an alumina support with a mean pore diameter of 160 nm and an alumina top (separation) layer with pores of 2-4 nm. The theory of Knudsen diffusion, laminar flow and surface diffusion is used to describe the transport mechanisms. It appears for the composite memb...

This paper “Part 2: Surface Adsorption, Electric Double Layer, and Diffusion Layer” is the applicational part a continuation of 1: Fundamentals” (https://doi.org/10.5796/electrochemistry.22-66082). explains principles cyclic voltammetry on adsorption, electric double layer, diffusion layer with microelectrodes. Moreover, recent trends, such as polymer electrolyte fuel cells (PEFCs), capacitors ...

The surface mixed layer of the ocean is often characterized by density compensation between the horizontal temperature and salinity gradients. In this contribution we present a combination of theoretical arguments and numerical simulations to investigate how compensation might emerge as a result of processes at work within the mixed layer. The dynamics of the mixed layer are investigated throug...

Using molecular dynamics simulation, the effect of Pb surfactant for the thin film growth of Co atoms on Cu 111 substrate was investigated. Specifically, the behavior of Co atoms being deposited on Cu 111 substrate with predeposited Pb layer was extensively investigated and compared with the case of without Pb layer to explain the effect of Pb surfactant. It was observed that Pb layer was float...

The evolution of copper-based interconnects requires the realization of an ultrathin diffusion barrier layer between the Cu interconnect and insulating layers. The present work reports the use of atomically thin layer graphene as a diffusion barrier to Cu metallization. The diffusion barrier performance is investigated by varying the grain size and thickness of the graphene layer; single-layer ...

The size of the shock-layer governed by a conservation law is studied. The conservation law is a parabolic reaction-convection-diffusion equation with a small parameter multiplying the diffusion term and convex flux. Rigorous upper and lower bounding functions for the solution of the conservation law are established based on maximum-principle arguments. The bounding functions demonstrate that t...

2014 The effects on fast surface state density due to high-temperature hydrogen anneals through windows in the silicon nitride layer next to the active MNOS regions are presented. A marked geometry effect is observed as a result of the occurring lateral hydrogen diffusion mechanism. Besides this lateral diffusion process, a vertical hydrogen diffusion through the nitride layer is observed at te...

The present work introduces a modified scheme for the solution of compressible 2-D full Navier-Stokes equations, using Flux Vector Splitting method. As a result of this modification, numerical diffusion is reduced. The computer code which is developed based on this algorithm can be used easily and accurately to analyze complex flow fields with discontinuity in properties, in cases such as shock...

In a note on the shape of the mammalian red cell, Hartridge (1) has suggested that the erythrocyte has a form which is a compromise between that of a sphere and that of an infinitely thin disc. Gas diffusing from the surface of either of these figures would reach the central regions at the same time. The sphere, however, offers a small surface compared to its volume, while in the thin disc, the...