Materials Literature
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Abstract The expressions for matrix elements of spin‐independent operators F and G with the use of Young operators are obtained in the case of arbitrary nonorthogonalized orbital configuration, including both singly and doubly filled orbitals and corresponding to the definite value of total spin. The formulas obtained…
SUMMARY Rabbits given lead acetate, cadmium chloride, or mercuric chloride in their drinking water for 70 days and then inoculated with pseudorabies virus (3 doses, 7 days between doses) as antigen had significantly lower neutralizing antibody titers than did the controls. The titers were determined by the plaque assa…
Twinning has been studied in several samples of VO2 containing in substitution solid solution 0.5 and 2.5 at.% Cr. The twinning is by reticular pseudo-merohedry and it is controlled by the tetragonal pseudo-symmetry of a superlattice obtained from the original monoclinic cell (a ≃ 9.1, b ≃ 5.8, c ≃ 4.5 Å, β ≃ 90°) by…
Abstract The chemistry of the cement‐forming reaction between a fluorine‐containing calcium aluminosilicate glass and aqueous solutions of poly(acrylic acid) has been studied using infrared spectroscopy and classical chemical procedures. It was concluded that calcium, aluminium and fluoride ions were leached from the…
Groups that are a generalization of magnetic groups, and called 'spin groups', are defined. Among the spin groups those called 'spin translation groups' are tabulated and described in some detail. The possible magnetic reflexions of unpolarized neutrons elastically scattered from a single crystal whose spin arrangemen…
S>From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). See CONF-731101-.
Abstract Methyl oleate was hydroformylated to methyl formylstearate at 120 C and 850–900 psig with a 1:1 mol mixture of hydrogen and carbon monoxide. In the presence of triphenylphosphite, an activated rhodium‐on‐alumina catalyst produced an essentially quantitative conversion in about 40 min. Filtration followed by d…
Abstract Von der monoklinen Modifikation der Verbindung CaGa 2 O 4 wurden Einkristalle dargestellt und ihre Kristallstruktur mit Diffraktometer‐Röntgendaten bestimmt; a = 7,992, b = 8,830, c = 10,585 Å, β = 94,72°, Raumgruppe C —P2 1 /C. Ebenso wie die orthorhombische stellt auch die monokline Modifikation einen weite…
The components of the maltose‐utilizing system in Escherichia coli ML, i.e. maltose permease, amylomaltase and maltodextrin phosphorylase, were re‐investigated, with the following findings: The concentrating mechanism (permease) is the rate‐limiting step in the maltose‐utilizing system. Maltose and higher maltodextrin…
Stress corrosion cracking (SCC) of iron and nickel base alloys in aqueous solutions at 289 C (552 F) has been studied using a straining electrode apparatus. Cracking susceptibility decreases in the order sensitized stainless steel, cold worked stainless steel containing martensite, sensitized Inconel 600, annealed sta…
Certain Ti and Zr solid solutions containing the ω phase exhibit intensity distributions in reciprocal space which are partly diffuse. In an effort to understand the structural meaning of these diffraction patterns, we have developed new methods for the evaluation of the kinematic intensity sum for certain kinds of at…
RÉSUMÉ Sur le plateau continental du Congo et du Gabon, on constate la formation de goethite, de berthiérine et de glauconies (smectite et glauconite). La berthiérine caractérise un milieu deltaïque a sedimentation active; les glauconies se forment sur le plateau continental à plus grande profondeur (—50à—300m). Dans…
Alumina powders with varying iron oxide contents were prepared by coprecipitation. The powders were spheroidized by passing them through an oxygen‐acetylene flame. The spheres were sized, annealed, and sintered in air and in N 2 with 132 ppm O 2 . Isothermal studies were combined with constant‐rate‐of‐heating studies…
Abstract An attempt was made to evaluate stresses on chemical bonds in axially stressed polymers from the shift of skeletal vibration frequencies in chain molecules. The maximum stress on chemical bonds was found to be at least ten times the average stress on the specimen.
Domain structures in the (010) plane are investigated in the secondary electron mode of S.E.M. The long axis of typical lenticular domains in crystals as grown is along the direction nearly perpendicular to the crystallographic c -axis. Fine lamellar structures appearing in annealed crystals are also along the same di…
Laser action has been observed for the following rare-earth ions in YAlO3:Ho3+(sensitized with Er3+and Tm3+), Er3+, and Tm3+(sensitized with Er3+) at wavelengths of 2.123, 0.851, and 1.861 μm, respectively. Measurements of spectroscopic properties, fluorescence kinetics, and laser performance of these ions in YAlO3are…
An homeotropic cell is built with a thin layer (5–25 μm) of nematic liquid crystal such as MBBA sandwiched between two indium oxide coated glass plates. The transient behavior of the cooperative angular variation of molecules submitted to an electric field step is studied theoretically. Experimental results are obtain…
Abstract Efficiencies of polymer radical production by thermal decomposition of di‐ tert ‐butylperoxy oxalate (DBPO) have been measured in bulk atactic polypropylene (PP) at 25–55°C; they range from 1 to 26%, depending on [DBPO], temperature, and presence of oxygen. Most of the polymer radicals thus produced dispropor…
Auger spectroscopy has progressed from its initial use as a purely research tool to that of an analytical technique of general application wherever information about the composition of non-volatile surfaces is important. This, article describes the underlying physics of the Auger process and the instrumentation involv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCambridge Crystallographic Data Centre. IV. Preparation of "Interatomic Distances 1960-65"F. H. Allen, N. W. Isaacs, Olga. Kennard, W. D. S. Motherwell, R. C. Petterson, W. G. Town, and D. G. WatsonCite this: J. Chem. Doc. 1973, 13, 4, 211–218Publication Date (Print):Novembe…