Materials Literature
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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…
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…
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…
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…
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…
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…
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…
Abstract not Available.
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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand field spectra of some tris(1,3-diketonato)iron(III) chelates. Electronic repulsion parameters and the nephelauxetic effectAngelo M. Fatta and Richard L. LintvedtCite this: Inorg. Chem. 1972, 11, 1, 88–92Publication Date (Print):January 1, 1972Publication History Publi…
The lower yield and flow stresses of polycrystalline pure iron specimens with a wide range of grain sizes from 10.3 μ to 102 μ were measured by tensile test at the temperatures between 77°K and 473°K at the strain rates from 10-7 sec-1 to 1 sec-1. The observed stress was decomposed into a friction part (al) and grain…
A study has been made of precipitation processes in selected magnesium-base alloys by means of electron microscopy. The principal part of the investigation was concerned with the effect of manganese precipitation in a Mg-Th alloy. It is shown that the sequence of precipitation in a Mg–2.0percnt; Th–1.0% Mn alloy (HM21…