Materials Literature
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The experimental results pertaining to the electronic structure of covalent amorphous semiconductors are briefly reviewed. It is found that three classes of materials exist, depending on the lowest-energy coordination of the predominant chemical component. In each case, the transport properties are ordinarily controll…
Magnetic measurements on the single crystal RGa intermetallic compounds (R=Pr, Nd, Sm, Tb, Dy, Ho and Er) have been carried out in the 4.2 K to 350 K temperature range. All the compounds, except ErGa, are ferromagnetism with high coercive force along the easy direction. ErGa compound is antiferromagnetism. The magneti…
Klebsiella pneumoniae ATCC 25955 (formerly named Aerobacter aerogenes PZH 572, Warsaw), which is known to produce coenzyme-B12-dependent glycerol dehydratase when grown anaerobically in a glycerol medium, formed coenzyme-B12-dependent diol dehydratase in a 1,2-propanediol-containing medium. Both the diol dehydratase a…
Abstract Aluminous hydroxy 2/1 clay minerals (‘intergrades’) can form in two ways: Al can either come externally from the solution, or internally from the mineral itself (octahedral or tetrahedral layers). This study is more concerned with the latter which seems the main source in acid soils. The most common organic a…
The results of an investigation of fluctuation-induced diamagnetism in superconducting layered compounds are presented. These results are used to establish the dimensionality of the superconducting fluctuation effects near ${T}_{c}$. Compounds studied include the intercalated compound $\mathrm{Ta}{\mathrm{S}}_{2}{(\ma…
Abstract Binary mixtures of a linear polyester (poly(ϵ‐caprolactone)) and a crystallizable monomer (trioxane) have been investigated by means of differential scanning calorimetry and optical and electron microscopy. The phase diagram indicates the existence of a eutectic at a temperature T mE = 314°K and for a polymer…
The temperature dependence of the mutual diffusion coefficient at zero solvent concentration for a number of polystyrene–solvent systems is satisfactorily represented by an equation derived from a new version of the free-volume theory of molecular transport. The free-volume parameter which governs the temperature depe…
Thermochemical data for gaseous UF5 and UF4 were obtained from equilibrium and electron impact measurements made by high temperature mass spectrometry. Equilibrium measurements yielded for the gaseous reaction Ag+UF5=AgF+UF4 the enthalpy change ΔH298=16.9±1.5 kcal by second law analysis. Additionally, the sublimation…
No abstract available.
Abstract α-Cyclodextrin (α-CDx) forms a 1 : 1 complex with p-nitrophenol (p-NP) and p-hydroxybenzoic acid (p-HB). The crystal structures were determined by the X-ray method. The crystals of both complexes are orthorhombic, and the space group is P212121 with Z=4. The cell dimensions are a=13.455(1), b=15.296(1), and c…
Abstract Laminated algal mats are well developed at Laguna Mormona, a closed hypersaline lagoonal complex on the west coast of Baja California, Mexico. These mats and underlying organic accumulations attain a maximum thickness of 30 cm. Their morphology is controlled mainly by the degree of desiccation: mound-shaped s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisposition requirements for binding in aqueous solution of polar substrates in the cyclohexaamylose cavityRaymond J. Bergeron, Michael Almy Channing, George J. Gibeily, and David M. PillorCite this: J. Am. Chem. Soc. 1977, 99, 15, 5146–5151Publication Date (Print):June 1, 1…
Intensity and power spectral density of acoustic emission in subcooled nucleate pool boiling of water from boiling inception to the heater burnout was investigated experimentally. Platinum and Ni-Cr wires with dia. 1.0 mm or smaller were used as the heater. The measurements were performed in containers at atmospheric…
The technique of polarized infrared spectroscopy was first used to study the structure of cellulose by Tsuboi( 1 ), Marrinan and Mann( 2,3 ), and Liang and Marchessault( 4-6 ), in the late 1950s. At that time the crystal structures of celluloses I and II were unknown, and the spectroscopic investigations were undertak…
Abstract The thermal expansion of GeS has been studied above room temperature up to the melting point of 658 ± 5°C by X‐ray diffraction techniques using a 190 mm diameter Unicam high temperature camera. The thermal expansion of the crystallographic axes is linear with distinct changes in the rate of expansion at about…
The kinetics of the anodic oxidation of tungsten metal in basic aqueous solution has been investigated using galvanostatic polarization. Anodic Tafel slopes were constant over all concentrations of hydroxide at 0.136 V/decade. Cathodic Tafel slopes ranged from 0.069 to 0.197 V/decade, increasing with hydroxide ion act…
Thermally stimulated currents (TSC) from polyethylene and ethylene–vinyl-acetate copolymers with a variety of vinyl-acetate contents have been investigated using a TSC technique with x-ray irradiation. Five main TSC peaks, which we believe are due to trapped carriers, were observed in these polymers. The detrapping of…
While the ability of the organic coating to conduct corrosion currents may sometimes come into play, primarily the corrosive deterioration of protective organic coatings is brought above by the flow of corrosion currents through a film of electrolyte beneath the organic coating. Any of several specific mechanisms may…
Magnetic and crystallographic properties of the (FeMn) 3 Si system have been studied by X-ray and neutron diffraction magnetization resistivity and magnetoresistivity measurements. The single-phase alloys have been found to crystallize in the L2 1 A structure and to have ferromagnetic properties at low Mn concentratio…
Abstract Examination of the infrared spectra of synthetic kaolinites, with various degrees of substitution of hydroxyls by OD groups, allows a more detailed attribution of the stretching bands due to inner-surface hydroxyls of kaolinite. Among the three innersurface OH groups of the unit cell, two are nearly perpendic…