Materials Literature
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Powder XRD defined α-AlF3 has been investigated by XPS and XAES using the Au 4f7/2 orbital for static charge referencing. This feature originates from well-defined and chemically inert 20 nm gold particles deposited in a highly dispersed pattern on the sample surface. The particles, with a sharp particle size distribu…
We have studied the electron emission characteristics of Mo field emitter arrays (FEAs) using a diamond-like carbon (DLC) film deposited by a layer-by-layer technique using plasma enhanced chemical vapor deposition. The turn-on voltage was lowered from 55 to 30 V by a 20 nm thick hydrogen-free DLC coating and maximum…
We have followed the evolution of the superconductingTc on intercalation of Li in ZrSe2 by means of magnetization studies at very low temperatures. To interpret the electronic structure and instabilities, we present the results of extensive LMTO-ASA band structure calculations on ZrSe2 and the idealized compound LiZrS…
The formation of spontaneous gratings in thin waveguide AgClAg photosensitive films was studied under elliptically polarized laser radiation. New peculiarities of the gratings growth were found (i) a deviation in angular position of the wave vectors of the most probable microgratings from π / 2 about the major axis o…
Abstract A method for enhanced nucleation of diamond growth on non‐diamond substrates is introduced via the results obtained in a wide variety of applications. The exact details of the method are still proprietary, but the outcome, as demonstrated in this paper, is unique and promises to be of great practical use. The…
In late 1993, Air Products and Chemicals, Inc. began operating a new steam-methane reformer at the Tosco Refining Co.'s Avon refinery in Martinez, CA, to provide hydrogen and steam to the refinery under a long-term supply agreement. The hydrogen plant--owned, operated, and maintained by Air Products--includes a select…
This paper discusses the electromagnetic field distribution in phase grating and the rate of diffraction for different diffraction orders by using a rigorous modal theory. Piece wise analytical function is used to express the eigen functions instead of the infinite series in other methods. Stable, fast and accurate re…
The oxidation of UO2 powder and ceramic has been studied in the (Li–Na–K)2CO3 eutectic melt containing added potassium chlorate between 723 and 873 K. Complete oxidation of the powder could be achieved at 723 K and with KClO3:UO2 mole ratios between 0.25 and 0.3. Potassium monouranate was formed in the reaction and no…
One of the shortcomings of ferritic stainless steels is their limited toughness. By modifying the steel chemistry to include vanadium, some improvement is obtained in this regard. In this work, the influence of different stabilizers and thermomechanical treatments on the toughness of an experimental 18Cr–4V alloy have…
Biosynthetic incorporation of isotopically labelled serines into pramanicin 1 in Stagonospora sp. ATCC 74235 shows that L-serine is incorporated as an intact entity with all four bonds to the α-carbon retained; thus 1 is assigned the 5S absolute configuration.
Abstract Surface tension is a parameter of decisive importance for characterizing painted and unpainted surfaces related to wetting and adhesion phenomena. This article presents measurements of the surface tension of solids by means of an automatic contact angle measurement device. The evaluation of the surface tensio…
The melting behavior of β-SiC with diamond structure was investigated under high pressures up to about 10 GPa using a flash-heating device. The peritectic temperature, at which the SiC decomposes into two phases of carbon saturated liquid Si and solid carbon (graphite) by a peritectic reaction, increases with pressure…
We have observed high-speed third-order nonlinear optical response using organic solutions of π-conjugated low-molecular-weight compounds. Optical Kerr shutter (OKS) measurement, third-harmonic generation (THG) measurement, and a degenerate four-wave mixing (DFWM) experiment were carried out to examine the high-speed…
A phosphor based on potassium aluminosilicophosphate glass activated with europium (III) and copper (II) has been synthesized. It has been shown that the europium luminescence is quenched by copper ions in the glass.
The application of variable-frequency drives (VFDs) in industrial and commercial facilities has seen a tremendous increase. However, when multiple VFDs are fed from one dedicated power transformer, care should be taken not to drive the transformer into saturation. At one industrial location, nine VFDs rated at 200 HP…
The Mn 2+ -containing oxide Mn 3 Ta 2 O 8 has been synthesised at 1200°C in Ar atmosphere, and its structure has been solved from X-ray synchrotron powder data (λ0.65 Å) by direct methods. The structure was refined by the Rietveld method to R F =6.3%, with space group I4 1 /a, a=11.2728(2), c=9.8030(3) Å, V=1243.47 Å…
X-ray powder diffraction studies revealed that Ag3Ga5Te9 and Ag3In5Se9 crystallize in orthorhombic and tetragonal systems, respectively. The temperature dependent conductivity and Hall effect measurements have been carried out between 65—480 K. Ag3Ga5Te9 exhibits p-type conduction with a room temperature conductivity…
More environmentally acceptable blowing agents, such as hydrochlorofluoro-carbons (HCFCs), hydrofluorocarbons (HFCs), hydrocarbons, and carbon dioxide have now replaced chlorofluorocarbon (CFC) blowing agents in many rigid polyurethane (PUR) and polyisocyanurate-modified polyurethane (PIR) foam applications. However,…
Crack growth behaviors in continuous fiber-reinforced ceramic matrix composites have been analyzed in termes of stress intensity factors using the finite-element method. Namely, the effects of Young's modulus ratio, Em/Ef, and fiber volume fraction, Vf, on the stress intensity factors have been investigated. As a resu…
To obtain an improved understanding of the production, development, and transport of crystal fragments during directional solidification of binary alloys, experiments have been performed for an aqueous ammonium chloride solution. For vertical directional solidification (VDS) induced by cooling from below, fragmentatio…