Materials Literature
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Five phosphate esters - tri-p-tolyl phosphate, tributyl phosphate, tris(1,3-dichloro-2-propyl)phosphate, tris(2,3-dibromopropyl)phosphate, and tris(2-chloroethyl)phosphate- were subjected to thermal oxidative degradation in air at 370 degrees C. Degradation mechanisms were postulated and the toxic hazards assessed bas…
Self-diffusion of 64Cu in copper single crystals has been measured over the temperature range 737°–1079°C. The curved Arrhenius plot is evaluated together with earlier tracer data according to the least-squares analysis of Morrison (1975), assuming mono-vacancy and divacancy diffusion to be operative. Neglecting possi…
The amino acid sequence of hemerythrin from the sipunculid worm, Themiste dyscritum, was determined by sequenator analyses of the S-pyridylethylated protein and fragments derived by further chemical and enzymatic cleavages. The fragments were obtained by cleavage of the intact protein with hydroxylamine, trypsin diges…
Abstract Durch Tempern der erneut an reinen Proben untersuchten Chalkogenide K 2 S, K 2 Se, Rb 2 S und Rb 2 Se mit HgS bzw. HgSe [360–380°C, 7d, Duranglasampullen unter Argon] wurden neu die mit hexagonalem Na 6 ZnO 4 isotypen Mercurate K 6 [HgS 4 ] [leuchtend zitronengelb a = 9,98 5 , c = 7,65 2 Å], K 6 [HgSe 4 ] [he…
The construction of a heating device for single-crystal diffraction is presented. The device operates with two coaxial gas streams, the central one of which is electrically heated by means of a resistance wire. As a result the crystal temperature is not affected by external factors such as flowing air etc. Temperature…
Abstract A modification of the carrier gas method for measuring permeability of a hollow fiber to a vapor is described with particular application to water vapor permeation through asymmetric cellulose triacetate in hollow fiber from. Conventional methods are inadequate because the high flux of permeation vapor combin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnvironmentally hindered radiationless transitions between states of different orbital parentage in iridium(III) complexes. Application of rigid-matrix induced perturbations of the pseudo-Jahn-Teller potential to the rigidochromic effect in d6 metal complexesRichard J. Watts…
The results of pulse echo measurements on polycrystalline V-Cr samples with approximately 0, 20, 40, 60, 80 and 100 at.% Cr show that the bulk modulus B and the shear modulus G increase nearly linearly with increasing chromium content between 0 and 80 at.% and between 40 and 100 at.% respectively. Due to the Neel poin…
The thermoluminescence of LiF TLD-100 dosimeter crystals has been studied using recently developed equipment for determining simultaneously the emission intensity and the emission spectrum as a function of sample temperature. Measurements were made on numerous samples exposed to 60Co irradiations at room temperature a…
The rate constants for the deactivation of O(1D) by Xe, Kr, and Ar were measured over the range 110–330 K. Only Xe had a significant temperature dependence. Its Arrhenius expression is { (8.5±1.7) ×10−11 exp[(−103±52)/RT] cm3/molecule⋅s} (E in cal/mole). The rate constants for Kr and Ar are (6.4±1.3) ×10−12 and (5.0±1…
Bulk cadmium stannate, Cd2SnO4, normally crystallizes in the orthorhombic system. Cadmium stannate obtained from sputtered thin films and from a high-temperature, high-pressure procedure has now been shown, on the basis of an X-ray diffraction investigation, to crystallize in the cubic system. The lattice parameter of…
The difficulties involved for the measurement of the circular magnetisation as a function of the circular magnetic field in ferromagnetic wires are discussed. An experimental arrangement which allows the study of the M phi -H phi hysteresis loops is shown.
Abstract The structure and behavior of homoionic bentonites was markedly affected by a grinding procedure often applied to clays. The main changes observed on clay powders were the breakage of weakly bound large aggregates, the reduction in the tactoids’ thickness by delamination, the reduction in the plates’ area, an…
Abstract The wetting behavior of human hair in water has been investigated using a technique based on the Wilhelmy balance principle. The experimental technique makes it possible to study the relaxation effects occurring at the solid–liquid–air interface. The results strongly suggest that interactions between the soli…
Upper bounds are derived to the many-electron density ${\ensuremath{\rho}}_{k}({x}_{1}, \dots{}, {x}_{k})$ ($2\ensuremath{\le}k\ensuremath{\le}n$) of an $n$-electron atomic or molecular wave function. The derivation is based on former results on the decay of the one-electron density and on the "Schr\"odinger inequalit…
“True” double bonds between tetravalent silicon and oxygen are present in molecular SiO 2 , now isolated by a novel matrix technique. This was accomplished by cocondensation of SiO (from a Knudsen cell) and O (generated by microwave excitation) in argon on a cold surface.
Abstract The thermal stability and degradation kinetics of several polystyrenes and styrene–alkyl methacrylate copolymers and terpolymers with a number‐average molecular weight ( M̄ n ) of 6000–250,000 g/mole have been studied using dynamic thermogravimetry (TG). The degradation kinetics of each polymer sample have be…
Abstract Small‐angle x‐ray scattering (SAXS) of isotropic or uniaxially oriented nylon 6 was investigated as a function of thermal and mechanical history. In addition to the peak position and linewidth of the SAXS maximum, the integrated SAXS intensity was measured. It was found that the radial intensity distributions…
Abstract Ultraoriented films of high density polyethylene (HDPE) have been prepared in continuous lengths by a new method, solid state coextrusion, through conical dies of extrusion draw ratios up to 36. Preformed HDPE billets ∽7 cm long and ∽1 cm in diameter of duPont Alathon 7050R, M w = 59,000, M n = 19,900, were s…
The thermoluminescence kinetics have been determined for the 13 glow peaks contained in the glow curves obtained from LiF TLD-100 after exposure to 60Co irradiations. The glow curves were constructed from measurements made with recently developed equipment for recording emission spectra at closely spaced temperature i…