Materials Literature
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The coherent X-ray diffraction experiment may be used to determine an electron density matrix for a crystal. Equations are displayed whose purpose is to convert measured scattering intensities (or structure factors) into a density matrix corresponding to a single determinant of molecular orbitals. With H and H2 as mod…
Iron-doped single crystals of the zircon-structure orthophosphates LuPO4, YPO4, and ScPO4 have been grown by means of a flux technique. Corresponding powders have been prepared independently by a urea precipitation technique and electron paramagnetic resonance measurements demonstrate that the Fe3+ impurity is situate…
The formation of hyperstoicheiometric oxides of UO2 by the incorporation of additional oxygen atoms in the parent fluorite structure is described in terms of 2 : 2 : 2 oxygen clusters. A 2 : 2 : 2 cluster between two uranium atoms is treated as a co-ordination defect and consideration of electrostatic and polarisation…
An experimental technique has been designed and tested to determine the dynamic yield curve of a rod in compression at high strain rates (∼104−106/sec). The technique involves impacting a gas‐gun accelerated cylindrical rod onto an identical stationary rod at high velocities, and using a high‐speed framing camera to t…
The principles of the use of sterically hindered amines as polymer and monomer stabilizers have been established by M. V. Neiman et al They studied the chemistry of a new class of compounds, the nitroxyl radicals [1-3]. The possibility of the use of these radicals as stabilizers is based on their recombination reactio…
A new dihydrochalcone-glucoside named confusoside (3) was isolated from the leaves of Symplocos confusa. This compound (3) was elucidated to be the 4'-O-β-D-glucoside of davidigenin (4) (2', 4, 4'-trihydroxyldihydrochalcone) by 1H and 13C nuclear magnetic resonance spectroscopy. No dihydrochalcone-glycoside could be i…
The contribution to the absorptance of a semi-infinite metal from electron-hole pair excitations, in terms of the inverse dielectric function of the metal, is discussed. A simple approximation is introduced for the full inverse dielectric function, which only depends on the unperturbed ground state electron density. T…
Bioactivation of carcinogens by peroxidases has received increasing attention since the discovery of the oxidation of carcinogens by prostaglandin hydroperoxidase. Benzidine and 3,5,3',5'-tetramethylbenzidine are oxidized by horseradish peroxidase and prostaglandin synthase to two-electron oxidation products (di-imine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance studies on high-spin iron(III) porphyrinsD. V. Behere, R. Birdy, and S. MitraCite this: Inorg. Chem. 1982, 21, 1, 386–390Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https://pu…
In the hexagonal tungsten bronze ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, the ordering of the vacancies of the Rb sites has been observed by neutron diffraction measurements. This ordering is the cause of the resistivity anomaly observed by Stanley et al. Another type of structural transition has also been found…
Electron diffraction and high resolution electron microscopy have brought to light three new ordered structures in a material of composition CaMnO(2.50 ± 0.02); in all these structures as well as in another analogous oxide, CaMnO2.75, the original features of the perovskite structure are preserved, thus offering an ex…
The existence of the monopoles both with one x (+2) line and two x (+1) lines in cholesteric volumes with spherical shape is shown experimentally by microscopic observations with polarized light. The effect of disapperarnce of x lines near the cholesteric-smectic A transition is discovered.
Using samples from 96 bales of Texas High Plains cotton, multiple regression techniques were used to select the "best" functional expression for the impacts of High-Volume-Instrument-measured fiber properties on the strength of open-end spun yarns. Results indicate that the most important fiber properties are strength…
Temperature variation of the refractive indices, birefringence, density and order parameter of liquid crystalline mixtures E7, E8, N10 and PCH-1132 are reported. The birefringence of PCH-1132 is found to be abnormally low compared to other mixtures.
Hydrothermal Isometric Tension (HIT) relaxation was observed at the boiling point in rat, cat and human skin samples of different ages, after raising the temperature from 37 degrees to 100 degrees C at a rate of 1.15 degrees C/min. A Maxwellian relaxation to nearly zero was observed at the boiling point. A given veloc…
ABSTRACT Oxygen‐sensitive foods are frequently packaged under vacuum or with inert‐gas flushing. This paper describes a method for oxygen removal from air headspaces in transparent packs by a singlet oxygen reaction in a polymer film. Illumination of a package enclosing a coiled film containing a photosensitising dye…
Abstract A reevaluation of the chemical, physical and physicochemical properties of the mineral in tooth enamel and dentine shows that the current models can not adequately account for the observed characteristics. On the basis of thermodynamical and solid state chemical principles an alternative model for the mineral…
Des résultats cristallographiques, concernant la série de conducteurs organiques à radicaux cationiques (TMTTF)2X avec X = Br-, I -, BF-4, ClO-4, NO -3, PF-6, SCN- ont été rassemblés et étudiés comparativement. Différents paramètres anioniques (forme, volume, pouvoir attractif) sont présentés et leur influence est dis…
Thermal degradation of polyethylene was studied under a wide range of oxidative degradation conditions including flaming combustion. The collection techniques described were designed to isolate the product mixtures so that secondary reactions were minimized. Both pyrolytic and oxidative degradation products were gener…
In large motors and generators, the surfaces of the stator coils and bars are finished with a partially conducting coating to suppress discharge activity between the insulation surface and the core. However, slot discharge activity has been reported in some air-cooled motors and generators where significant areas of t…