Materials Literature
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Abstract Microprobe analyses of optically homogeneous detrital biotites from sandstones of the Visingsö Group and the Dala Sandstone, Sweden, revealed a consistently low K content (generally <0.75 atom/formula unit) and variable amounts of Fe, Mg, Al, and Si. Electron probe profiles of some biotite grains indicated…
The short- and long-range spin correlations in the quasi-one-dimensional S=(1/2) system (${\mathrm{C}}_{6}$${\mathrm{D}}_{11}$${\mathrm{ND}}_{3}$)${\mathrm{CuBr}}_{3}$ (CHAB-D14) have been investigated by (quasi) elastic neutron scattering experiments. The temperature dependence of the sublattice magnetization below $…
In order to stimulate further thought and research within the science of dielectrics, this paper discusses the remarkable correlation between acoustic theory and the physics of electrical breakdown in dielectrics. Following a brief, simplified fied review of acoustic theory and the propagation and attenuation ation of…
Ytterbium-DTPA was evaluated as a potential intravascular contrast agent. Ytterbium-DTPA was synthesized from ytterbium oxide and diethylene triamine penta-acetic acid (DTPA). CT scans of increasing concentrations of ytterbium and iodine showed that at 125 kVp, ytterbium was denser than an equal concentration of iodin…
Abstract By impregnating cotton fiber with alkaline swelling agents and reacting with some chemical agents which can be substituted for the hydroxyl groups on cellulose molecules in the presence of alkali, highly accessible or decrystallized cotton fibers can be obtained. As the effective substitution reactions, acety…
Although monolithic ceramic materials have been widely used in the past in nonstructural applications - such as electrical insulators, crucibles, microwave windows, and pump and valve components for the chemical industry - it has been only in recent times that major efforts have been made to use ceramics in structural…
Abstract Polymers with different compositions of vinyl alcohol and vinyl acetate units (P(VA‐VAc)), obtained by alcoholysis of poly(vinyl acetate) with sodium methoxide, were mixed with poly( N ‐vinyl‐2‐pyrrolidone) (PVP). The miscibility was studied observing glass transition temperatures by differential scanning cal…
The Garton effect has been observed in PET films in the low-frequency range from 0.0003 to 0.1 Hz. The current wave manifests a remarkable deformation which depends on the temperature, the applied voltage, the frequency and the sample thickness. Tan delta evaluated from the power loss decreases with the increase in ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of transition-metal tetracoordinated complexes. 1. Theoretical ab initio and UV-photoelectron spectroscopy study of palladium(II) and platinum(II) square-planar acetylacetonate complexesSanto Di Bella, Ignazio Fragala, and Gaetano GranozziCite this: Inor…
Transformers and reactors used in the electric power transmission systems show non-linear magnetization characteristics, the exact knowledge of which is essential to the study of system transient operation. This paper describes a measurement method for these characteristics, based on D.C. EXCITATION. During such excit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleProton NMR investigation of iron(III) 5,10,15,20-tetrakis(2,6-disubstituted phenyl)porphyrins. Isolation and characterization of hydroxy-ligated (5,10,15,20-tetrakis(2,6-difluorophenyl)porphinato)iron(III)T. C. Woon, A. Shirazi, and Thomas C. BruiceCite this: Inorg. Chem. 1986,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent selection and batch crystallizationAllan S. Myerson, Stefanie E. Decker, and Weiping FanCite this: Ind. Eng. Chem. Process Des. Dev. 1986, 25, 4, 925–929Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Published inissue 1 October…
Abstract not Available.
Abstract The diagenetic conversion of smectite to illite in shales has been proposed as a mechanism for generating overpressure (fluid pressure above hydrostatic) in sedimentary basins. However, the mechanism and rate-controlling factors of the reaction and the magnitude of the resulting volume change are not known. I…
Optical diffraction patterns are presented which illustrate the effect of multi-site correlations on the diffraction pattern of a model disordered alloy consisting of different sized atoms placed on a simple square lattice. Monte Carlo methods were used to apply size-effect distortions to a number of example lattices…
Thermomechanical properties of aluminum titanate‐mullite composites were studied for a wide composition range to develop material having high thermal shock resistance. The thermal shock resistance tended to increase with increasing aluminum titanate content. Composite having 82 vol% aluminum titanate can withstand wat…
We consider a model based on the Maier and Saupe theory in order to explain the reentrant nematic-isotropic transition observed in lyotropic liquid crystals. By assuming a linear dependence of the micellar shape anisotropy with temperature, we show that it is possible to obtain a reentrant transition.
In this work we study CaF2:Ce,Mn and use optical absorption, photoluminescence (excitation and emission), and x-ray-induced luminescence to characterize the role played by Ce in various lattice sites during these processes. The data indicate that energy transfer takes place from Ce to Mn, predominantly from Ce3+ in te…
Studies of the oxidation of Ni(111) in the temperature range 30–275°C by low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and ellipsometry have shown that the epitaxy of the oxide is dependent on the growth temperature. Below 150°C the commonly reported hexagonal p(2×2)-O and NiO(111) patterns…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew polyheterocyclic 4n.pi.-electron dianions. Paratropicity, charge delocalization, and reactionsYoram. Cohen, Amatzya Y. Meyer, and Mordecai. RabinovitzCite this: J. Am. Chem. Soc. 1986, 108, 22, 7039–7044Publication Date (Print):October 1, 1986Publication History Publishe…