Materials Literature
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The oxidation of NO toNO2 and CO to CO2 in quartz gas-sampling microprobes drawing gases from fuel-lean flames of CH4/air and CO/air has been modeled and measured. The kinetic model includes surface recombination of O- and H-atoms. Confirming measurements were obtained by gas-sampling a jet-stirred reactor. It was pre…
The index of refraction of oxides grown on silicon in dry oxygen has been found to be a function of the growth temperature. There is an orientation effect for oxides grown at low temperatures. The index decreases with temperature, saturating above 1190°C at 1.4620, a value consistent with the index of fused quartz whe…
Chicken gizzard filamin has been digested with purified Ca2+-activated protease. The subunits of (Mr = 250,000) of the protein are cleaved asymmetrically into two fragments, heavy merofilamin, Mr = 240,000, and light merofilamin, Mr = 9,500. Digestion is complete at substrate to enzyme ratios of 100:1 and requires Ca2…
The physical and nuclear properties of EU2O3 were reviewed, evaluated, and compared with those of the other potential control materials for breeder reactors. Europia with a 90% theoretical density has approximately the same amount of europium atoms per unit volume as the pure metal. Consequently, the reactivity worth…
A new Sn II O compound , the first oxostannate( II ) of defined structure, has been obtained as brownish‐yellow single crystals. X‐Ray structure analysis reveals a complicated perovskite variant (Sn 1 O 3 Sn 2 double layers) in which half of the anions are missing in a regular manner.
Polybenzimidazole (PBI) is the only textile fiber, either commercial or developmental, which under normal conditions is nonflammable in air, emits little or no smoke, and produces virtually no toxic offgases up to a temperature of 560°C. PBI also has the textile processing properties of polyester, and garments made fr…
Abstract A new EPR spectrum of V 2 O 5 is reported which is related to the non‐stoichiometry of the crystals. Its intensity increases on reduction and decreases on reoxidation. The spectrum is labelled El. El can be described by an S = 1 spin Hamiltonian with parameters g x = 1.33, g y = 2.51, g z = 1.01 ( y ‖ b , x a…
Summary The high-temperature transformation of andalusite (Al 2 SiO 5 ) into 3/2-mullite ( 3 A 2 O 3 2SiO 2 ) plus vitreous silica (SiO 2 ) has been studied within the temperature interval from 1300 to 1600 °C by means of X-ray powder and single-crystal techniques and by infrared spectroscopy. Results are interpreted…
The well known breakdown theories, Townsend's generation mechanism and the streamer mechanism, are reviewed and applied to the results of breakdown in the strongly electronegative gas, sulphur-hexafluoride. Experimental results reported in the literature on the breakdown behavior of sulphur-hexafluoride are examined i…
La conformation et l'ordre dans les solutions de polyélectrolytes sont étudiés d'abord pour une chaîne isolée puis pour plusieurs chaînes chargées enchevêtrées correspondant au régime semi-dilué. L'effet de changement de conformation dû à une variation de la densité de charge sur le polyion et à l'écran électrostatiqu…
The crimped structure of wool fibres is generally associated with a bilateral arrangement of ortho- and paracortical cells. The most obvious difference between these cell types is in the arrangement and relative proportions of microfibril and matrix proteins that constitute the fibre cortex. In the low-crimp fibres ex…
The paper considers the elastostatic axisymmetric problem for a long thick-walled cylinder containing a ring-shaped internal or edge crack. Using the standard transform technique the problem is formulated in terms of an integral equation which has a simple Cauchy kernel for the internal crack and a generalized Cauchy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParametric and Durability Studies of NOx Reduction with NH3 on V2O5 CatalystsGeorge L. Bauerle, S. C. Wu, and Ken NobeCite this: Ind. Eng. Chem. Prod. Res. Dev. 1978, 17, 2, 117–122Publication Date (Print):June 1, 1978Publication History Published online1 May 2002Published i…
The anodization of evaporated aluminum/copper alloy films has been investigated using Rutherford backscattering. It has been shown that the copper, initially distributed uniformly through the aluminum film, is not incorporated in the anodic oxide but accumulated at the metal oxide interface. At high potentials this in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelenium substitution in [Fe4S4(SR)4]2-: synthesis and comparative properties of [Fe4X4(YC6H5)4]2- (X, Y = sulfur, selenium) and the structure of [(CH3)4N]2[Fe4Se4(SC6H5)4]M. A. Bobrik, E. J. Laskowski, Richard W. Johnson, W. O. Gillum, J. M. Berg, Keith O. Hodgson, and R. H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction between orthogonal magnetic orbitals in a copper(II)-oxovanadium(II) heterobinuclear complexO. Kahn, P. Tola, J. Galy, and H. CoudanneCite this: J. Am. Chem. Soc. 1978, 100, 12, 3931–3933Publication Date (Print):June 1, 1978Publication History Published online1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleChemistry of multilayered cyclophanesSoichi Misumi and Tetsuo OtsuboCite this: Acc. Chem. Res. 1978, 11, 6, 251–256Publication Date (Print):June 1, 1978Publication History Published online1 May 2002Published inissue 1 June 1978https://pubs.acs.org/doi/10.1021/ar50126a005https://…
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A series of Heusler alloys, with composition Ni 2 Mn(Mn x Sn 1−x ) has been studied. X-Ray and neutron diffraction techniques have been used to investigate the chemical order. Well-ordered alloys were prepared with compositions corresponding to x = 0.1. 0.2, 0.3, and 0.4. The magnetic properties of these ordered alloy…
The single-crystal elastic constants of tetragonal Al2Cu have been measured over the temperature range 4.2–300 K by the pulse-echo-overlap technique. The directly measured constants show a normal monotonic decrease in magnitude with increasing temperature but with C44 showing the least change. The anisotropy ratios C3…