Physics of Electronic Ceramics
Abstract not Available.
Materials Literature
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Vapor-Phase Epitaxial Growth and Some Properties of ZnSe, ZnS, and CdS
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…
Recherches sur les textures des états mésomorphes - 1. Les arrangements focaux dans les smectiques : rappels et considérations théoriques
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…
Instabilités magnétiques d'un smectique C
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…
Crystal Growth from the Melt under Destabilizing Thermal Gradients
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
"The Corrosion of Copper, Tin and their Alloys." British Corrosion Journal, 7(1), p. 6
Inhibition of Electromigration Damage in Thin Films
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…
Mouvements de parois dans une lame mince nématique
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…
Order in amorphous polystyrenes as revealed by electron diffraction and diffraction microscopy
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 THE WRITE PROCESS IN DIGITAL MAGNETIC RECORDING
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…
Abrasion Resistance
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.
Experimental Investigation on the Collapse Strength of Spherical Shells
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…
Interpretation of the low frequency Raman spectra of molten lithium nitrate and molten silver nitrate
Low frequency bands due to librational motions of the nitrate ion are observed in the Raman spectra of molten lithium nitrate (at 143 cm–1) and molten silver nitrate (at 107 cm–1). The peak frequencies, shapes and intensities of these bands were studied as a function of dilution with various other salts. It is conclud…
Anomalous triplet-state behaviour in solid tris(dipivaloylmethanato)terbium(III)
Fluorescent decay times of solid Tb(dpm)3 and its monoadducts with EtOH, EtOD, and pyridine have been determined over the temperature range 77—323 K. The decay time of Tb(dpm)3, in contrast to the adducts, is markedly temperature-dependent. This anomalous behaviour is interpreted as a result of thermal population of a…
Structure cristalline du sulfoarséniure de cérium Ce As S
CeAsS crystallizes in the monoclinic group P2₁/b ; the unit cell dimensions are : a = 4.047 Å ; b = 5.616 Å ; c = 17.450 Å ; γ = 135.85°. There are four formulae per unit cell. The crystals are twinned by reticular pseudomerohedry. The structure (R = 0.093) is closely related to the antitype of Fe₂As. It shows compact…
Reactivity of Modified Starches with Isocyanates
Abstract Various substituents were added onto starch by means of esterification or etherification so that their effect on reactivity of starch with isocyanates in a nonpolar solvent could be studied. Maximum reactivity of the modified starches was achieved when the degree of substitution (D.S.) was about 0.7. Cured ur…
The (Tl,Na,Li)NO3, (Tl,Na,Rb)NO3, (Tl,Na,Cs)NO3 Ternary Systems
Abstract Solid-liquid equilibria were studied by a visual method in order to draw the polythermal pro-jections of the (Tl, Na, Li)NO 3 , (Tl, Na, Rb)NO 3 , and (Tl, Na, Cs)NO 3 ternary systems. The seven pertinent binaries are also discussed and data concerning the invariant points and crystallization regions are give…
Substituent effects on the half-wave potentials of chalcones in dimethylformamide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the half-wave potentials of chalcones in dimethylformamideDavid W. Boykin Jr., Mary L. Ash, and Frank L. O'BrienCite this: J. Org. Chem. 1972, 37, 1, 106–110Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published…
Torsion Effusion Determination of Sodium Partial Pressure Over Na[sub 2]O
Abstract not Available.
Magnetic anisotropy and second-order crystal fields in some tetragonally distorted tetrahedral cobalt(II) ions
The principal and average magnetic moments of Cs3CoX5 and (Et4N)2CoX4, [X = Cl, Br] have been measured in the temperature range 80–300 K. Magnetic transitions showing small hysteresis effects are found for both tetraethylammonium salts. The results are correlated with a point-charge model of D2d symmetry by use of the…