Materials Literature
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Abstract Polarized Raman and IR spectra of a single KY(MoO 4 ) 2 crystal were measured in the 10–4000 cm −1 region and discussed in relation to the molecular and crystal structures. Spectroscopic data enabled us to reveal additional intermolecular interactions due to pair coupling of the molybdate tetrahedra verifying…
The variation with heat flow geometry of minimum heat source temperature which causes smolder initiation in cellulosic insulation has been examined for eight configurations. These configurations range from a wire-like source, to a flat planar source, to a corner formed by planar sources; they simulate such heat source…
Different values are reported in the literature for the intrinsic birefringence of the crystalline (Δn) and the amorphous (Δn) phases in nylon 6. Mostly, these values have either been determined by extrapolation (and then it is assumed that Δn = Δn) or calculated theoretically. In this study, intrinsic birefringence v…
Delayed failure tests, in which the samples were cathodically charged with hydrogen while under sustained tensile loads, were conducted upon two medium carbon alloy steels which had been quenched, tempered, and cold drawn to very high strength levels. The results were correlated with the microstructure and fractograph…
Several bioclastic and oolitic carbonates have been studied with the transmission electron microscope. Aragonite has been distinguished from calcite on the basis of the SAD patterns and the morphology. The aragonite occurred either as microscopic crystals varying in length from 0.3 to I mm, or as larger masses twinned…
An example of the possible uses of the newly obtained, surprisingly stable title compound (1) is in the synthesis of the unsymmetric siloxane (2). At ca. 240°C (!) (1) forms the new, sterically very crowded cyclotrisiloxane (tBu2SiO)3.
A new technique has been developed to study the surface energy characteristics of small diameter fibres. This method is tensiometric and based on wetting properties in a two phase liquid system. Two types of carbon fibre have been investigated under both static and dynamic conditions in immersion and emersion. The hig…
Abstract The glass transition, rubbery modulus, and tensile behavior of poly(n‐butyl acrylate)/polystyrene interpenetrating polymer networks (IPN's), semi‐1 IPN's, and their corresponding random copolymer networks were studied as a function of both composition ratio and crosslink density. Two temperatures were selecte…
Abstract The sand and silt fractions of soils derived from Tertiary basalt in northeastern Ireland exhibit unusually high cation-exchange capacities. Smectite was identified by X-ray powder diffraction in all size fractions and was selectively dissolved by treatment with 1 N HCl and 0.5 N NaOH. Structural formulae, ba…
The influence of boundary conditions on the smectic A-C * phase transition has been studied. From a consideration of the free energy under the anchoring condition with planar orientation of moelcules on two boundaries, it is shown that the phase transition temperature from the smectic-A to smectic-C phases decreases w…
The siliceous valve of Hantzschia is briefly described, preparatory to following its morphogenesis. While Hantzschia is morphologically very different to Pinnularia, there are several subtle but important similarities in detail. Bundles of microfilaments, significant in generating the gliding motion of these cells, li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of metalloporphyrins. 1. Experimental electron density distribution of (meso-tetraphenylporphinato)cobalt(II)Edwin D. StevensCite this: J. Am. Chem. Soc. 1981, 103, 17, 5087–5095Publication Date (Print):August 1, 1981Publication History Published online1…
Magnetic field dependences of the first and the second uniaxial magnetocrystalline anisotropy constants K u1 and K u2 for hcp Co were obtained at various temperatures between 4.2 and 616 K by using the 90-points least mean square routine. It was found that the contribution of the Fermi level-dependent term to d K u1 /…
Abstract In Anlehnung an eine phänomenologische thermokinetische Fluktuationstheorie des Glasübergans wird ein Ansatz zur Beschreibung des Einfriervorgangs und von Nachwirkungserscheinungen im Rahmen der linearen Reaktion vorgestellt. Anhand der Auswertung von Thermogrammen \documentclass{article}\pagestyle{empty}\beg…
Abstract The release of norethindrone from a poly(ortho ester) derived from 3,9‐bis(methylene)2,4,8,10‐tetraoxaspiro[5,5] undecane and 1,6‐hexanediol was studied. Thin circular devices containing incorporated drug and a water soluble salt, such as sodium carbonate, sodium sulfate, or sodium chloride, were placed in wa…
The theory of inelastic electron tunnelling spectroscopy (IETS) and the suitability of this technique for examining adhesive-aluminium oxide interfaces are discussed. IET spectra are presented of an epoxide resin (the diglycidyl ether of bisphenol A), two aliphatic amine hardeners (di-[1 -aminopropyl-3-ethoxy] ether a…
Transport and phosphorylation of glucose via enzymes II-A/II-B and II-BGlc of the phosphoenolpyruvate:sugar phosphotransferase system are tightly coupled in Salmonella typhimurium. Mutant strains (pts) that lack the phosphorylating proteins of this system, enzyme I and HPr, are unable to transport or to grow on glucos…
Cathodic electrochromism of lutetium diphthalocyanine films on insulating substrates was investigated by a moving‐boundary technique. Reduction occurred by injection of electrons from a gold contact and cations from a liquid electrolyte. Light blue products formed with aqueous or organic solutions of alkali metal salt…
X-ray and neutron scattering techniques have been used to investigate the spin Peierl's transition in $N$-methyl-$N$-ethyl-morpholinium bistetracyanoquinodimethane [MEM ${(\mathrm{TCNQ})}_{2}$]. Both techniques reveal a doubling of the $c$-axis stacking of the TCNQ molecules below the transition. Diffuse x-ray scatter…
(1981). Mixed Valency Chemistry: A Survey of 10 Years Progress. International Reviews in Physical Chemistry: Vol. 1, No. 2, pp. 149-193.