Materials Literature
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Abstract An experimental study of the solution properties of poly( m ‐phenyleneisophthalamide) (MPD‐I) in dimethylacetamide (DMA)/LiCl solutions is presented. Differential refractometry, light scattering photometry, dilute and concentrated solution viscometry, and normal stress experiments are reported and interpreted…
The static field breakdown and corona characteristics of SF6-N2 mixtures in non-uniform field gaps for applied voltages of positive and negative polarities are discussed. Mixtures containing 0 to 100% SF6 are studied over a pressure range of 100 to 500 kPa. The results show that for such gaps, the dielectric behavior…
Abstract Pure silicon carbide and silicon nitride have valuable properties in bulk pore‐free form; however, their industrial exploitation has hardly been possible so far. Neither compound can be melted or sintered in pure form; hot pressing or sintering at normal pressure requires the presence of additives; and the re…
Compact as possible difference schemes for systems of nth order equations are developed. Generalizations of the Mehrstellenverfahren and simple theoretically sound implementations of deferred corrections are given. It is shown that higher order systems are more efficiently solved as given rather than as reduced to lar…
The study of moisture induced aluminium corrosion in the presence of passivation layers and plastic encapsulants has shown that the corrosion rate is determined by the surface conductivity of the water layer that forms on the die surface. The surface conductivity is determined by the external environment and the adhes…
The torque generated during yarn-twisting is considered to have three components, due, respectively, to fibre torsion, fibre-bending, and the internal fibre tensile and compressive stresses within the yarn. An analysis of the yarn torque generated by fibre torsion will be given in a later paper, and the component due…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance investigation of copper(II) complexes with reversed g values in A and Y zeolitesRichard G. HermanCite this: Inorg. Chem. 1979, 18, 4, 995–1000Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue…
To understand the extent of the cross-linking of proteins by the bifunctional reagent p-NN'-phenylenebismaleimide, a quantitative study of competing reactions has been undertaken. The two reactive maleimide rings of the bismaleimide are hydrolysed in mildly alkaline aqueous solutions much more rapidly than is the sing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrito-nitro linkage isomerization in the solid state. 1. X-ray crystallographic studies of trans-bis(ethylenediamine)(isothiocyanato)nitrito- and trans-bis(ethylenediamine)(isothiocyanato)nitrocobalt(III) perchlorate and iodideIngmar Grenthe and Ellika NordinCite this: Ino…
In this article we apply the theory developed in the previous publication to the uniaxial displacive ferroelectrics ${\mathrm{Pb}}_{5}$${\mathrm{Ge}}_{3}$${\mathrm{O}}_{11}$ and SbSI. We show that the parameters of our model can be determined from available experimental data for these substances. The values obtained a…
The macroscopic third-order nonlinearity Γ of a nematic liquid crystal has been measured for the first time with the technique of dc electric-field-induced optical second-harmonic generation. The effect of nematic ordering on Γ is observed. Results are in good agreement with theoretical calculations.
The dynamical properties of a model describing the structural phase transitions in (C${\mathrm{H}}_{3}$N${\mathrm{H}}_{3}$)$_{2}\mathrm{CdCl}_{4}$ perovskite-type layer compounds as orientional order-disorder transitions of the C${\mathrm{H}}_{3}$N${\mathrm{H}}_{3}$ groups, are investigated. It is shown that the soft…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption of Lean NOx in Aqueous Solutions of NaClO2 and NaOHElzo Sada, Hidehiro Kumazawa, Ichibei Kudo, and Takashi KondoCite this: Ind. Eng. Chem. Process Des. Dev. 1979, 18, 2, 275–278Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Pub…
Dislocations in LED's were studied and found to have a pronounced effect upon the external quantum efficiency of the diodes. A simple theoretical model, based on the postulation that the dislocations act as effective nonradiative recombination centers, is proposed to explain the experimental results. It is observed th…
Abstract Comparisons were made of differential scanning‐calorimetric (DSC) thermograms of both liquid and powdered commercial phenol–formaldehyde resins. By a combination of the results from analyses under a variety of conditions, such as ambient pressure, high pressure, using freeze‐dried samples, and also by direct…
Conditions are discussed under which an interface, possibly containing an adsorbed species, is capable of sustaining an atomistically sharp cleavage crack, rather than having any such crack blunt out via dislocation nucleation. Two models for ductile versus brittle interface response are discussed. One of these is app…
There are close similarities between conodont elements and teeth both in general shape and in that they possess pointed tips and have expanded bases with more porous tissue. A number of examples of conodont elements which parallel specific kinds of tooth shapes and organizations are added to earlier known similarities…
Abstract. — Measurements are reported of densities as a function of temperature for the homo-logous series of alkyl-cyano-biphenyl liquid crystals C„H2 „ + 1. 0. 0. C N for n = 5 to 9. Cubic B-splines have been fitted to the experimental results and their derivatives have given the coefficients of thermal expansivity.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilyl ketone chemistry. A new regiospecific route to silyl enol ethersHans J. Reich, Jay J. Rusek, and Richard E. OlsonCite this: J. Am. Chem. Soc. 1979, 101, 8, 2225–2227Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1…
Abstract The transformation of a spun isotactic polypropylene fiber into a high strength elastic fiber has been followed structurally. By examining each stage of the transformation separately, it has been possible to identify the different structural mechanisms that occur as the process proceeds. The recognition of th…