Materials Literature
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Transmission electron microscopy is used to characterize the hole-formation process due to laser writing in evaporated and sputtered Te thin films and in a Se-Te bilayer. Bilayers, with Se as the top layer, combine the effect of an antireflective coating with protection against oxidation and provide the advantage of a…
Abstract Anodic protection makes it possible to keep materials which can be passivated in a “passive” state or to bring them into this state, even in unfavourable conditions. With sulphuric acid concentrations of 93–99% this method permits the use of inexpensive, stainless austenitic steels, e.g. 1.4541 and 1.4591, at…
This letter presents data on the release of He from Ni at temperatures between 18 and 300 K after ion implantation of He at 18 K. The release occurred in two stages, a sharply peaked release near 50 K and a broad release that extended from 80 to 300 K. For He doses in the range of 5×1014–1.4×1016 cm−2 and shallow impl…
The so called ‘constant-Q’ models of Becker and Lomnitz are shown to be two special cases of a ‘constant-Q’ hypergeometric model. The Becker and Lomnitz cases appear to be the extreme cases of our more general model, and these special cases yield essentially the same mechanical behaviour over all frequencies. However,…
Raman spectroscopy has been used to distinguish structural differences between α-12-heteropoly anions and β-12-heteropoly anions in solution. The results are consistent with the Keggin structure for the α-isomers and a modified Keggin structure for the β-isomers. Reduced 12-molybdophosphates and molybdovanadophosphate…
The behaviors of hydrogen in β-vanadium hydride VH0.59 were studied by the 1H NMR spectroscopy. Fourier-transformed spectra, spin-spin relaxation times, and spin-lattice relaxation times were measured in the temperature range between 77 and 420 K, and it was found that there are two kinds of hydrogen which occupy diff…
Wilkinson's catalyst, RhCl(PPh 3 ) 3 is a well known and widely used homogeneous hydrogenation catalyst. This catalyst was analyzed by ESCA which revealed that two rhodium species [Rh(I) and Rh(III)] were present, both for commercial preparations and for catalysts prepared in this laboratory. The ratio of Rh(I) to Rh(…
Poly(vinyl chloride) degrades thermally by an acceleratory reaction in which the rate of hydrogen chloride evolution is slow at the beginning, increases with time (passing through a maximum), and then decreases. A kinetic model based on the zipper mechanism shows excellent agreement with observed data from the initial…
(1982). Histological Differentiation of Wool Fibres in Formic Acid. The Journal of The Textile Institute: Vol. 73, No. 3, pp. 149-151.
The effect of MgO and ZrO 2 dopants, added separeately or simultaneously, on the grain size, denisity, and toughness of Al 2 O 3 was studied. Small ZrO 2 addotoopms (<100 ppm) had little effect, whereas larger amounts decreased the sintered density. Additions of Mgo Up to the solubility limit (∼ 300 ppm) increased…
Indium-rich alloys containing solute atoms such as Cd, Hg, Tl, Sn and Pb undergo four kinds of phase transformation: (1) fcc→fct ( c / a >1), (2) fcc→fct ( c / a <1), (3) fct ( c / a <1)→fco→fct ( c / a >1) and (4) fct ( c / a <1)→fct ( c / a >1). We have investigated these phase transformations usin…
ABSTRACT Frankfurters were made in a nonvacuum bowl chopper. Batter samples were taken after 2, 6, 9, 12, and 15 min of chopping and after 30, 60, and 90 min of cooking. Both raw and cooked batter samples were fixed in solutions of glutaraldehyde and paraformaldehyde, OsO 4 , and then embedded in SPURR (low‐viscosity…
The performance of TRISO‐coated high‐enriched uranium/ low‐enriched uranium fissile and ThO 2 fertile fuel particles was studied under simulated accident conditions at temperatures up to 2700°C. A total of 1663 fuel particles from eight irradiation capsules with burnups covering the range of design conditions was test…
Amorphous silicon containing fluorine and carbon, pure and doped with boron or phosphorus, was deposited cathodically from solutions of K 2 SiF 6 in acetone with HF . The conditions for optimum deposition were determined, and the deposits were characterized by electron microprobe x‐ray emission, electrical conductivit…
Threshold switching is observed in n+-i-n+ sandwich structures of hydrogenated amorphous silicon after an initial forming process. At the threshold voltage the device switches from a low conductance to a high conductance state. The devices remain stable after more than 109 switching operations at a pulse frequency of…
Anodic leveling of a triangular surface profile under secondary and tertiary current distribution conditions has been studied both theoretically and experimentally. Numerical simulation of the leveling process was carried out using the finite element method (FEM). Experiments were performed in a flow cell with advanci…
It has been shown that stress corrosion cracking can be induced in 70/30 brass by solutions of sodium acetate, formate and hydroxide, and by a tartrate solution, of which only the latter has previously been reported as a potent environment for the cracking of brass. The stress corrosion cracking tests were conducted a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphazene high polymers with bioactive substituent groups: prospective anesthetic aminophosphazenesHarry R. Allcock, Paul E. Austin, and Thomas X. NeenanCite this: Macromolecules 1982, 15, 3, 689–693Publication Date (Print):May 1, 1982Publication History Published online1…
The primary steps involved in a heterogeneously catalyzed reaction are illustrated schematically by Figure 1. These include adsorption and desorption steps of the particles involved as well as surface migration and reactive and nonreactive interactions. Thus a reaction path may be offered to the overall chemical trans…
This is the first of a series of papers dealing with work on the surface structure of yarns, which formed the basis for the development of the Sirospun process. The paper explains that untreated single yarns are generally unsuitable for use as warp yarn in weaving, mainly because the surface fibres are not adequately…