Materials Literature
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Abstract The elastoviscous behavior of polyisobutylene may be interpreted in terms of a mechanical model consisting of a distribution of Maxwell elements connected in parallel. The structure of this “generalized Maxwell model” is specified by the distribution of relaxation times of the component elements. The relaxati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Oxidation of Oxalate Ion by Peroxydisulfate1Thomas L. AllenCite this: J. Am. Chem. Soc. 1951, 73, 8, 3589–3593Publication Date (Print):August 1, 1951Publication History Published online1 May 2002Published inissue 1 August 1951https://doi.org/10.1021/ja01152a012RIGHTS & P…
The binary compounds Li 2 O.5Al 2 O 3 and Li 2 O.Al 2 O 3 can be formed easily by reaction of pure materials at 1500°C. The ternary compounds βeucryptite and βT‐spodumene and solid solutions involving these two compounds can be prepared by reaction of Li 2 CO 3 , Al 2 O 3 , and SiO 2 at 1300°C. The thermal expansions…
Magnesium carbonate, basic carbonate, and hydroxide were calcined at temperatures of 300° to 2000°C. for periods ranging from 120 hours at the low temperatures to a few minutes at the higher ones. The resulting magnesium oxides were studied by means of X‐ray powder diffraction and electron and petrographic microscopy.…
Summary The elementary concepts of crystal dislocation theory—in particular the Burgers vector, perfect and imperfect dislocations, sessile dislocations, extended dislocations, twin and twinning dislocations—are defined in a manner independent of particular crystal lattices or models or special orientations of the dis…
Abstract The paper describes how measurements of the spontaneous magnetization of pure specimens of single-crystal close-packed hexagonal and polycrystalline face-centred cubic cobalt have been made over the temperature range -183 to 1121° C. A single crystal of cobalt possessing a close-packed hexagonal structure was…
Neutron scattering and diffraction studies on a series of paramagnetic and antiferromagnetic substances are reported in the present paper. The paramagnetic diffuse scattering predicted by Halpern and Johnson has been studied, resulting in the determination of the magnetic form factor for ${\mathrm{Mn}}^{++}$ ions. Fro…
A new method of inspection of impregnation of solid-type cable insulation was developed. This method is based on the property of oils and waxes to fluoresce when activated by ultraviolet light. This method reveals details of impregnation in new cables and wax formation in old cables that are not apparent with ordinary…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemoval of Submicron Aerosol Particles from Moving Gas StreamP. J. SchauerCite this: Ind. Eng. Chem. 1951, 43, 7, 1532–1538Publication Date (Print):July 1, 1951Publication History Published online1 May 2002Published inissue 1 July 1951https://pubs.acs.org/doi/10.1021/ie50499…
This paper is primarily concerned with the mechanics of textile fabric abrasion. However, considerable attention is devoted to the theory of friction and the theory of cutting of crystalline solids. This is intended as a framework for the study of visco-elastic fibrous materials. Such an approach seems logical in view…
This paper reports the development of a new synthetic resin bonded mica tape insulation for high-voltage stator windings. It reviews the problems associated with earlier forms of high-voltage machine insulation. The general construction and processing of the insulation are described briefly. Comprehensive test data ar…
From the intensities of powder diffraction lines the positions of the deuterons in N${\mathrm{D}}_{4}$Cl have been determined at liquid nitrogen and room temperatures. The experimental results confirm at low temperature the space group $T_{d}^{}{}_{}{}^{1}$ and the tetrahedral structure of the ammonium ion with an $N\…
Corrosion damage can be classified into: 1) General (unlocalized) corrosion, 2) Pitting, 3) General intergranular corrosion, 4) Stress corrosion, 5) Corrosion fatigue. Of these, the first causes least weakening, while the last two cause the most weakening. Stress corrosion, differs from corrosion fatigue in requiring…
The structures of highand low-boracite have been analysed using powder and Weissenberg photographs (Me Ka, A = 0.71 A., Cu Ka, h--1.54 A.). The unit cells and space groups are: No. of molecules a (A.) b (A.) c (A.) in the unit cell High-boracite 12.1 8 (CIMg3BTOla) (at 300 ° C.) Low-boracite 8.54 8.54 12.07 4 (C1Mg3BT…
It can be shown that the dissolution of titanium in sulfuric, hydrochloric, hydrobromic and hydroiodic acids must proceed according to the reaction Ti0 → Ti3+ 3e, exactly as when titanium dissolves in hydrofluoric acid. The rate of dissolution of Bureau of Mines titanium in sulfuric and hydrochloric acids below 2 N is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVolumetric and Phase Behavior of Propene-Propane SystemH. H. Reamer and B. H. SageCite this: Ind. Eng. Chem. 1951, 43, 7, 1628–1634Publication Date (Print):July 1, 1951Publication History Published online1 May 2002Published inissue 1 July 1951https://pubs.acs.org/doi/10.1021…
A study has been made of phase equilibria in the system $$A1_{2}O_{3}-H_{2}O$$. Results are expressed in the form of a pressure-temperature diagram, showing regions of stability for the crystalline phases gibbsite, boehmite, diaspore, and corundum. The diagram shows pressure and temperature minima ($$2,000 lb/in^{2},…
A modified slot discharge detection method, which permits tests without Shutting down the machine or using auxilliary high-voltage test equipment, was investigated. The method involves connection of frequency sensitive equipment across all or part of the ntral impedance. Tests on eight vertical water wheel generators…
Measurements of the dark electrical conductivity σ, and Hall coefficient were made on sintered spectroscopically pure zinc oxide powder samples over a temperature range from 100°K to 625°K and at room temperature on zinc oxide crystals containing lead impurities, using both the usual dc potentiometer-probe method and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting and Glassy State Transitions in Cellulose Esters and their Mixtures with Diluents1,2Leo Mandelkern and Paul J. FloryCite this: J. Am. Chem. Soc. 1951, 73, 7, 3206–3212Publication Date (Print):July 1, 1951Publication History Published online1 May 2002Published inissue…