Materials Literature
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We give an extensive theoretical and experimental discussion of the statics and dynamics of the Freedericks transition of nematic MBBA films in a magnetic field. The experimental data are obtained from measurements of the anisotropy of the thermal conductivity across the film both in the « planar » and « homeotropic »…
A detailed description is given of certain results of domain structure theory which have been obtained recently and which have not, so far, been treated in monographs or reviews. A large part of the article consists of an analysis of the fundamentals of the theory; the properties of domain structures which are indepen…
Research Article| March 01, 1972 Authigenic Aluminosilicate Minerals in the Tuffaceous Rocks of the Green River Formation, Wyoming RONALD C SURDAM; RONALD C SURDAM Department of Geology, University of Wyoming, P.O. Box 3006, Laramie, Wyoming 82070 Search for other works by this author on: GSW Google Scholar RONALD D P…
A general expression for the local field in anisotropic crystals is derived and applied to crystals of iodoform, benzene, naphthalene, anthracene, bi-phenyl and phenanthrene. The principal refractive indices of anisotropic crystals are related to components of an effective molecular polarizability tensor via anisotrop…
Abstract Organic‐free specimens of 5 metals were prepared and characterized by parameters indicating their relative surface charge, surface texture, and surface energy prior to evaluation of their degree of thromboresistance. For the materials studied, there was no predictive correlation between the pre‐implatation el…
Macrocyclic polyethers: Dibenzo-18-crown-6 polyether and dicyclohexyl-18-crown-6 polyether reactant: 222 g. (1.55 moles) of bis(2-chloroethyl) ether product: Dibenzo-18-crown-6 polyether product: dicyclohexyl-18-crown-6 polyethers solvent: petroleum ether (b.p. 30–60°, approximately 200 ml. was required) solvent: dich…
Creep tests on pure copper and single-phase copper-aluminium alloys (5.8, 11.5, and 16.0 at.-% Al) have been made at 450, 550, and 650° C (723, 823, and 923K) and 19.6, 39.2 and 58.8 MN/m2 (2.0, 4.0, and 6.0 kgf/mm2). Both normal and sigmoidal transient-creep curves were observed, according to the creep-stress and tem…
Based on combined x-ray and neutron-diffraction data, an inference for the coexistence of the B2(CsCl) and P3̄m1 structures in the TiNi-II phase is made. Other experimental evidence indicates the proportion of the B2 to P3̄m1 structures to depend critically on the thermal and mechanical history of the alloy. Through a…
Abstract not Available.
Single‐crystal layers of ZnSe , ZnS , and CdS have been grown epitaxially on GaAs , GaP , and sapphire substrates in an open‐tube system by reaction of the metal vapors with the nonmetal hydride gases. Various factors are discussed which were found to affect the epitaxial growth. These include the role of vapor compos…
Après avoir revu la géométrie des cyclides de Dupin, plusieurs problèmes concernant leur application aux mésophases smectiques sont étudiés. Les résultats de Friedel et Grandjean [8], [9], [12] sont discutés. Si nous supposons que les coniques focales sont les seules singularités de la structure lamellaire, nous pouvo…
Prolongeant une récente théorie élastique des smectiques C, nous établissons une forme de cette énergie de type Frank, en fonction de deux vecteurs unitaires liés aux axes locaux du matériau. Puis, nous utilisons cette théorie pour déterminer le champ magnétique critique des instabilités de Freederichs d'une lamelle d…
Direct time correspondence between crystal growth behavior and the thermal characteristics of the melt under destabilizing gradients was established by means of “time markers” which were introduced into the growing crystals and simultaneously registered on the continuous recording of the thermal behavior of the melt.…
"The Corrosion of Copper, Tin and their Alloys." British Corrosion Journal, 7(1), p. 6
Mechanisms proposed to describe electromigration damage in thin film stripes are based on the observations that mass transport in films is controlled mainly by grain boundary diffusion and that irregularities in the boundary network give rise to divergencies in the mass flux. Two such irregularities, for example, are…
Lors de la transition de Freedericks, deux configurations (+) et (-) également stables sont permises. Nous étudions la structure et l'énergie des parois qui relient les zones (+) et (-), ainsi que leur mouvement lorsqu'on lève la dégénérescence des solutions. Nous déterminons la vitesse d'évanescence des parois entour…
Abstract Ordered regions ranging in size between 15 and 45 A have been established in several atactic polystyrenes of various molecular weights (4800; 51,000; and 1,800,000) as well as in an amorphous isotactic polystyrene by means of electron diffraction and high-resolution diffraction microscopy. The order is due to…
An analytical model of saturation NRZ recording is used to calculate transition lengths in media with hysteresis curves which are not square. The maximum gradient of transition magnetization is computed, including the field gradients of the major hysteresis curve and the spatial gradients of the recording‐head field a…
The problem of resistance to abrasion exists all around us—on floors, walls, furniture, automobiles, highways, signs, military gear, spacecraft, etc. Because abrasion or wear resistance is a basic factor in the durability of a coating, its measurement is of practical importance to both producer and consumer.
In order to obtain the collapse strength data on the spherical shells suitable to the pressure capsule of DSSV, collapsing tests were conducted using spherical shell models by means of MHI 1, 200 kg/cm2 hydrostatic tank. These models were made from several kinds of materials including ultra-high yield strength steels…