Materials Literature
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The crystal structure of ktenasite from Miniera Trentin (space group P 2 1 / c , a = 5.589, b = 6.166, c = 23.751 Å, β = 95.55°) was determined by Patterson and Fourier methods and refined to a final R value of 0.058. The structure is characterized by corrugated sheets ∞ 2 [(Cu, Zn) 2 (OH) 3 O] − of distorted copper-z…
The asymmetri cis→trans photoisomerization of cyclo-octene (1) in the presence of the chiral aromatic esters, (–)-menthyl benzoate (2), cholesteryl benzoate (3), or di-(–)-menthyl isophthalate (4) gave (R)-(–)-trans-cyclo-octene with a maximum enantiomeric excess of 4·0%.
Suggestions are g ive n on how to e xpress magne ti c q ua ntities in 51
The crystal structure of the title compound (C10H9N2) [Fe(C10H8N2)3] (ClO4)4 has been determined at c. 295 K from diffractometer data and refined by least squares to R 0.056 (7018 reflections with I > 3s(I)). Crystals are triclinic, Pi, a 16.607(3), b 13.496(3), c 10.254(2) ?, a 101.13(2), ß 92.08(2), ? 102.77(…
The effect of decreasing dissolution rate of nickel oxide per unit surface area in acid solution with increasing prior annealing temperature (700–1450°C) has been shown to occur over a wide range of pH. The linear dependence of log (rate) on pH may be explained on a model of non-oxidative dissolution in which the pH v…
Abstract Two monomeric N ‐substituted bisitaconimides, N , N ′‐bisitaconimido‐ p , p ′‐diphenylmethane and N , N ′‐bis(itaconimido‐ p , p ′‐diphenyl ether), were synthesized from the corresponding diamines. The synthesis was accomplished by reaction of the diamine with itaconic anhydride and cyclocondensation of the r…
The effect of bumetanide upon the endocochlear potential (EP) was examined in 46 guinea pigs. The EP was reduced with dosages of 5 mg/kg or more. The maximum depression of the EP (reduction to -30 to -40 mV) was obtained at a dosage of 30 mg/kg. The recovery of the potential was incomplete at any dosage within three h…
(1978). Fracture Toughness of Powder Metallurgy and Conventionally Produced High-Speed Steels. Powder Metallurgy: Vol. 21, No. 1, pp. 13-28.
This paper shows how capacitance-voltage curves can be used to determine nematic liquid crystal dielectric and elastic constants and surface tilt angles. Careful analysis of the C-V curves reveals that distortion free energy theory is useful up to a V/Vc of about two. A detailed curve of tilt angle as a function of Si…
Conditions and catalyst have been found that cause the hydrometallation of terminal olefins with MgH2 in nearly quantitative yield.
Nous présentons une méthode de calcul qui permet de determiner le nombre de défauts ponctuels créés dans une cascade de déplacements initiée par un ion lourd se ralentissant dans une cible diatomique. La méthode est utilisée pour déterminer le nombre d'atomes uranium et oxygéne places par une fission dans UO2. A compu…
Part 3 describes the solving of water‐conditioning problems that cannot be entirely worked on the Caldwell‐Lawrence diagrams. Some practical aspects of plant operations are discussed as well.
Abstract The secondary electron emission induced by electrons in the energy range 2.5–25 keV was measured in a SEM. Values of the emission coefficient for C, Al, Cu, Mo, Ag and Au are presented showing that it varies systematically with atomic number. The coefficient is still appreciable at 25 keV beam energy. The sig…
Abstract Polarized Raman intensities have been obtained from thin films of oriented low‐density polyethylene (PE) immersed in silicone oil to minimize surface scattering. Studies were made using the 1170 cm −1 crystalline band and the 1081 cm −1 amorphous band, and from these the orientation averages 〈cos 2 θ〉 and 〈co…
Starch microspheres, degradable by endogenous blood amylase were selectively injected into the femoral and superior mesenteric arteries, respectively, to obtain temporary local ischemia in foot and gut of the rat. The experimental models are described. Studies with tracer microspheres demonstrated, that the blood flow…
Abstract
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure and magnetic properties of trans-bis(L-methioninato)copper(II), Cu(C5H10NO2S)2Chia-Chih Ou, Dana A. Powers, John A. Thich, Timothy R. Felthouse, David N. Hendrickson, Joseph A. Potenza, and Harvey J. SchugarCite this: Inorg. Chem. 1978, 17, 1, 34–40Public…
The first evaluation methods for stainless steels, the 65 percent nitric acid and the copper sulfate-sulfuric acid tests, were originally simulated service tests. Later, when the results obtained with these tests were used to prevent failures by intergranular attack in other media, they were transformed into methods o…
The symmetry aspects of probable distortions in perovskite-like crystals are discussed. Four soft modes of the lattice which are condensed at different conditions lead to the distortions. The superpositions of the independent distortions (tilts and polar displacements) are considered and the symmetry of the phases is…
A theory of melting is developed based on the dislocation model, in which liquid is regarded as a crystal saturated with dislocations. It is shown that introduction of dislocations is accompanied with lattice dilatation due to lattice anharmonicity. The dilatation makes the dislocation energy per unit length a decreas…