Materials Literature
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Abstract The ab initio self‐consistent energy band structure of trigonal selenium based on the Hartree‐Fock‐Slater formalism has been determined with the self‐consistent symmetrized OPW method (SCSOPW). The influence of lattice constants, exchange potential, and relativistic effects is discussed. The density of states…
A measurement of the dielectric breakdown strength in low- and high-density polyethylene was carried out under the condition of elongation by tensile stress. The wave forms of applied voltages were a.c., d.c. and impulse (1×40 µs) voltages, and the thickness of films of polyethylene was ca. 50 µm. In the case of low-d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal complexes containing an optically active macrocyclic ligand. Manganese(III), nickel(II), and copper(II)Philip S. Bryan and James C. DabrowiakCite this: Inorg. Chem. 1975, 14, 2, 299–302Publication Date (Print):February 1, 1975Publication History Published on…
Multiple melting behavior in nylon 6 is analyzed by means of a high temperature X-ray camera (HTXC) and a differential scanning calorimeter (DSC). Melting in the intermediate phase between crystalline and amorphous ones is supposed to contribute to the higher temperature peak in DSC. The recrystallization process is c…
The effect of hydrostatic pressure on structural phase transition temperatures above room temperature in CsPbCl 3 and CsPbBr 3 was studied by dielectric measurements at high pressures up to about 8 kbar. The initial pressure coefficients of the transition temperatures are 7.65 deg kbar -1 , 5.2 deg kbar -1 , and 5.4 d…
Motion of a screw dislocation in a model b.c.c. crystal has been analyzed through the following procedure: (1) Peierls potentials for translations between stable and metastable positions of a screw dislocation are computed atomistically for a model crystal under various shear stresses on various planes, (2) activation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of manganese complexes containing a synthetic macrocyclic ligandPhilip S. Bryan and James C. DabrowiakCite this: Inorg. Chem. 1975, 14, 2, 296–299Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published i…
Abstract A comparison is made of the ion exchange behavior, towards the cobalt ion, of five sodium montmorillonite clays. The selectivity for the bivalent ion at low cobalt loading is correlated with the average dimensions of the particles in the various clays, as characterized by several methods. The data are interpr…
The tapeta lucida and the organization of the visual cells of the walleye and the sauger are studied. The reflecting material of the tapeta is demonstrated to be a reduced pteridine, 7, 8-dihydroxanthopterin, which occurs in the epithelial processes as densely packed anisometric granules about 0.5 μm long.The organiza…
Abstract Fabric refers to the spacial arrangement of clay particles in a sample relative to a reference plane. X-ray diffraction data yield an ‘amount of orientation’ ( AO ) that varies from zero for ideal random to 100 for ideally oriented fabric. The AO has been related to the average angle of inclination of clay pa…
Abstract not Available.
Two aromatic polysulfones, poly(oxy-1,4-phenylenesulfonyl-1,4-phenyleneoxy-1,4-phenyleneisopropylidene-1,4-phenylene) (I) and poly (oxy-1,4-phenylenesulfonyl-1,4-phenylene) (II), undergo crosslinking and chain scission at 30°C during γ-irradiation, the former being predominant in vacuum and the latter in air. Both pro…
Cathodic electrolysis of 2H⋅⋅⋅TaS2 in a dilute sulfuric acid electrolyte results in intercalation of hydrogen and water. The water content increases as the ionic strength of the electrolyte is decreased. Addition of neutral surfactants (1%−10% Triton X−705 or glycerol) followed by high−speed stirring gave TaS2 layers…
The reactivity and the mode of activation of the essential--SH group (Cys-149) of D-glyceraldehyde-3-phosphate dehydrogenase have been studied by means of a spectrophotometric method [Polgár, L., FEBS Lett. 38, 187-190 (1974)], capable of detecting the dissociated form of the thiol group in proteins. Alkylations of Cy…
Cell extracts of Brucella abortus (British 19) catabolized erythritol through a series of phosphorylated intermediates to dihydroxyacetonephosphate and CO-2. Cell extracts required adenosine 5'-triphosphate (ATP), nicotinamide adenine dinucleotide (NAD), Mg2+, inorganic orthophosphate, and reduced glutathione for acti…
The conduction mechanisms of ultrathin (10−100 Å) metal films are investigated. The electrical conductivity and activation energy of discontinuous Au films grown in UHV are correlated with island size and separation and average film thickness. The relationship between film conductivity and deposition rate and substrat…
To investigate the mechanism of the killer effect of iron group ions (M 2+ ) on the green luminescence in ZnS:Cu, Al phosphors, the dependences of the intensity and decay rate of the green luminescence on the M 2+ concentrations, the relation of the green luminescence intensity vs. excitation intensity, and some other…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of tetramethylammonium tetrachloroferrate(II). Comparison of iron(II) and iron(III) bond lengths in high-spin tetrahedral environmentsJoseph W. Lauher and James A. IbersCite this: Inorg. Chem. 1975, 14, 2, 348–352Publication Date (Print):February 1, 1975Publication…
We show that for certain liquid crystals, characterized by very small nematic/smectic−A latent heats, the transition from a nematic phase, held firmly in a bent state, to a smectic−A phase takes place via an intermediate state which is stable in a given temperature range and which we have called ’’striped texture’’. T…
The poling of certain compositions of PLZT ceramic is shown to cause a phase transition (α→β). The polar β phase can be rhombohedral, tetragonal, or orthorhombic depending upon composition, while phase α is always cubic. Characteristic subgrain domain structure is observed in the β phase for orthorhombic and rhombohed…