We performed detailed H isotope diffusion measurements in the upper 3 m of firn at Summit, Greenland. Using a small snow gun, a thin snow layer was formed from H-enriched water over a 6× 6 m area. We followed the diffusion process, quantified as the increase of the δH diffusion length, over a 4-year period, by retrieving the layer once per year by drilling a firn core and slicing it into 1 cm l...

The diffusion of Ag in CdTe exhibits anomalous concentration profiles, which essentially reflect the profile of the deviation from stoichiometry. At a diffusion temperature of about 800 K, the Ag dopant atoms are present as charged interstitials. The deviation from stoichiometry at diffusion temperature substantially changes upon an external source of Cd atoms. Such an external source can be re...

terbutaline sulfate exhibits extensive first pass metabolism and a short elimination half life which makes frequent oral administration of the drug inevitable. a novel buccoadhesive controlled delivery system of the drug can easily overcome the problem. a two-layered core tablet composed of a fast release layer made of mannitol, lactose, peg and the drug attached to a sustained release layer co...

We report the growth of high density silicon Oxide (SiOx) nanowires at an elevated temperature. The nanowires density is enhanced by inserting a thin layer of chromium metal in gold/Si catalyst system. The SiOx nanowires were grown with gold/chromium catalysts stack layer on the Si substrate at different temperatures ranging from 1050oC to 1150oC. Under the catalysis reaction of the gold/chromi...

Interdiffusion studies on high-T, superconducting YBasCu,O,_s thin films with thicknes~s in the range of 2000-3000 A, on a Si(ll1) substrate with a buffer layer have been performed. The buffer layer consists of a 400 A thick epitaxial Nisi, layer, covered with 1200 A of polycrystalline 210,. YBa,Cu,O,_s films were prepared using laser ablation. The YBa,Cu,O,_, films on the Si/NiSi,/ZrOs substra...

In this research, we propose the new type two-layer cellular neural networks. In our two-layer cellular neural networks, calculation start time of each layer have difference. In particular, the first layer is calculated in first, and output of the first layer is inputted to the second layer. By using diffusion processing in this structure, we expect that the complex image processing using the C...

Using simulations of hard rods in smectic-A states, we find stringlike clusters of up to 10 interlayer rods exhibiting dynamic cooperativity. We also find non-gaussian diffusion and heterogeneous dynamics due to the equilibrium periodic smectic density profiles, which give rise to permanent barriers for layer-to-layer diffusion. This relaxation behavior is surprisingly similar to that of nonequ...

The primary removal of product water in proton exchange membrane (PEM) fuel cells is through the cathode gas diffusion layer (GDL) which necessitates the understanding of vapor and liquid transport of water through porous media. In this investigation, the effect of microporous layer (MPL) coatings, GDL thickness, and polytetrafluorethylene (PTFE) loading on the effective water vapor diffusion c...

Abstract: titanium sheets in pure molten aluminum at 750 and X-Ray Diffraction Analysis results, TiAlintermetallic layer thickness increases slowly at primary stages. After that an enhanced growth rate occurs due to layercracking and disruption. Presumably, reaction starts with solving titanium into the molten aluminum causing intitanium super saturation and TiAlintermetallic layer which conseq...