Materials Literature
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Fission product release tests and control tests recently conducted at Oak Ridge National Laboratory have provided new experimental data that help characterize the mechanism of fission product tellurium release behavior under severe light water reactor accident conditions. Release of tellurium from the fuel rod segment…
Abstract We present a theoretical treatment of nematic‐isotropic phase equilibria in mixtures which consist of random coils and comblike polymers, the latter components being composed of a rigid backbone and flexible side chains. The mixing partition function is evaluated by using the Flory lattice model. The comblike…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure and barrier to inversion of tetrasilabicyclo[1.1.0]butane. Comparison to bicyclo[1.1.0]butaneScott Collins, Remo Dutler, and Arvi RaukCite this: J. Am. Chem. Soc. 1987, 109, 9, 2564–2569Publication Date (Print):April 1, 1987Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnimolecular decomposition of oxalic acidTerumitsu. Kakumoto, Ko. Saito, and Akira. ImamuraCite this: J. Phys. Chem. 1987, 91, 9, 2366–2371Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/d…
Abstract The crystal and molecular structures of the title complexes were determined by the single-crystal X-ray diffraction method. Both of them are triclinic, with the space group P\bar1. The crystallographic data: 2-methylpyridine (α-pic) adduct, a=11.076(3), b=18.478(8), c=9.299(3)Å, α=104.60(3), β=114.84(2), γ=81…
Abstract Through replacement of cations with neutral molecules of similar shape and polarizability in a highly conducting “metal‐like” change‐transfer organic conductor, the deliberate control of the electronic structure from a quarter to a half‐filled band is possible. This goal has been achieved with the N ‐methylph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of acylpolysilanes containing .alpha.-hydrogens. Formation of linear head-to-head silene dimersKim M. Baines and A. G. BrookCite this: Organometallics 1987, 6, 4, 692–696Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published…
Monolithic alumina ceramics and alumina matrix ceramic composites show considerable promise as structural materials in a number of energy conversion and utilization applications. The ability to join these materials to themselves and to metals is vital to the successful use of these ceramics in advanced devices. Metall…
The varistor properties were examined in porous ZnO. The sample used contained no dopants such as Bi 2 O 3 or Pr 6 O 11 , which are usually considered to be useful in developing varistors. Comparison of I‐V curves for the oxidized and unoxidized samples indicated that oxygen, which had chemisorbed and diffused into th…
We study the influence of nonlinear effects on the electrohydrodynamics of uniaxial nematic liquid crystals. To measure a novel reversible nonlinear coupling between an electric field, distortions of the director, and the stress tensor, we suggest an experimental setup and predict the occurrence of a flow in an initia…
The preparation of sodium phosphate oxynitride (Na‐P‐O‐N) glasses was investigated in dry ammonia, forming gas and 90% N 2 + 10% CO atmospheres. Significant nitrogen dissolution, up to 13 wt% in a NaPO 3 melt, occurred only in ammonia. The kinetics of nitrogen dissolution was studied as a function of remelting time (1…
Abstract Auger electron spectroscopy has been used to characterize the oxidation of polycrystalline zirconium in an oxygen atmosphere at low pressures (10 −8 ≤ P ≤ 10 −5 Torr) and room temperature after cleaning the surface by Ar + ‐ion bombardment. Quantitative analysis of the oxidation process was performed by using…
Stress relaxation measurements in tension have been made on nitrile rubber vulcanizates containing short jute fibers. The effects of strain level, bonding system (silica-resorcinol-hexa), fiber orientation, fiber content, temperature, and prestraining on the rate of stress relaxation have been investigated. Existence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe question of Friedel-Crafts transformylations. Acid-catalyzed reactions of aromatic aldehydes with arenesRoyston M. Roberts, Ahmed M. El-Khawaga, Kevin M. Sweeney, and Maher F. El-ZohryCite this: J. Org. Chem. 1987, 52, 8, 1591–1599Publication Date (Print):April 1, 1987Pu…
Two phase transitions have previously been identified in ${\mathrm{K}}_{3}$${\mathrm{Cu}}_{8}$${\mathrm{S}}_{6}$, a second-order transition at 153 K and a first-order transition at 55 K. In this x-ray scattering study we show that the 153-K transition, which is associated with a decrease in the conductivity, correspon…
Abstract A monoclinic II b -2 clinochlore from Washington, D.C., contrary to previous studies, is primarily a ferroan rather than a ferrian chlorite. Disorder of tetrahedral Si,Al cations is indicated because of unsuccessful structural refinements in subgroup symmetries. The true space group is C 2/ m . Slight orderin…
Polymerization of pyrrole occurred on an irradiated surface of n ‐ TiO 2 semiconductor electrode in aqueous solutions of pyrrole, when the electrode potential was set between −0.6 and +1.5V vs. SCE. The conductivity of deposited polypyrrole film (as grown, in the doped state) was ca. 1S cm −1 . Electrochemical undopin…
Microstructural evolution of a 7.8 mol% Ca‐PSZ, fired at 1870°C and subsequently aged at 1300°C, was studied and correlated with the mechanical properties. The morphology, rafting, and subsequent coarsening of the tetragonal ( t ) ZrO 2 precipitates were of particular interest, as was the instability of some of the t…
It is shown that the degradation of XLPE, resulting from its exposure to partial discharges, leads to the formation of solid, liquid and gaseous products that result directly from the discharge synthesis reactions taking place within the intervening electrode gap space. The prime reagents in the discharge synthesis pr…
Abstract Trifunctional hydroxy‐terminated oligomeric polyesters, M n 500, 1000, and 2000, were prepared by initiating ring‐opening copolymerization of δ‐valerolactone and ε‐caprolactone with glycerol. The prepolymers were converted to crosslinked polyester‐urethanes by their reaction with hexane‐1,6‐diisocyanate in pr…