Materials Literature
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It has been possible to identify two critical compositions in the IV-VI chalcogenide glassy system ${\mathrm{Ge}}_{x}{\mathrm{Se}}_{100\ensuremath{-}x}$ by the anomalous variations of the high-pressure electrical resistivity behavior. The first critical composition, the chemical threshold, refers to the stoichiometric…
This book will be useful to those involved in optical transmission and scanning electron microscopy (SEM) studies of polymers. The chapters include methods for morphological investigations and determination of fine structure (crystallinity, orientation) in various types of polymers and polymer blends. The effects of p…
ABSTRACT In order to protect production tubing from corrosion during acidic stimulation treatments at temperatures above 250°F (121°C), inhibitors containing heavy metals (copper, arsenic or antimony) have been employed. These metallic inhibitors are the subject of increasing regulatory control in the US and abroad. A…
Abstract Five structurally different scale inhibitors were studied using a kinetic adsorption-desorption technique. Adsorption was fast. All inhibitors adsorbed to a similar degree. Desorption was slow. There were large differences in the degree to which different inhibitors desorbed. The kinetic desorption characteri…
Abstract The occurrence of calcium sulfate scale in wells has recently become a sporadic major problem in producing wells in some CO2 floods.1 The problem has also been observed in wells where a potential scaling factor exists and the produced water has more than a fraction of a percent of carbon dioxide gas. Where ca…
An approach to the theory of unstable bound states of electrons in the nuclear field is suggested. This approach permits the determination of unstable bound states when a quasistationary approximation is unjustified and, therefore, methods normally used for this purpose in the atomic theory cannot be applied. The equa…
Mercuric reductase, with FAD and a reducible disulfide at the active site, catalyzes the two-electron reduction of Hg(II) by NADPH. Addition of reducing equivalents rapidly produces a spectrally distinct EH2 form of the enzyme containing oxidized FAD and reduced active site thiols. Formation of EH2 has previously been…
The mean asphericities (A d ) of open and closed Gaussian polymer chains are computed exactly and analytically (up to simple quadratures) for arbitrary space dimensions d. Excellent agreement is found with existing simulation data for d=2, 3, and 4. The authors' technique can also be used to compute other averages of…
Many glasses and liquids exhibit a first sharp diffraction peak that is evidence for intermediate-range order caused by regularities in the packing of structural units. These tend to cluster around particular values of the wavevector when scaled by the nearest-neighbour distance or the mean inter-atomic spacing. The f…
Vibrations of amorphous Si are represented by the network model of Wooten, Winer, and Weaire and the forces of Stillinger and Weber. It is shown how the Kubo formula for thermal conductivity can be evaluated "exactly" assuming harmonic vibrations, making only finite-system-size errors. The results support a "shunt-res…
The salts (HL)2[MoOC]5] where L = 2-aminobenzothiazo], 2-amino-4-chlorobenzothiazol or 2-amino-6-methoxybenzothiazol have been prepared. Dehydrohalogenation of the salts gave complexes of formula [MoOCl3L2], and hydrolysis of the salts gave dinuclear complexes with formula [Mo2O4Cl2L4].
The possibilities of electron microscopy for the study of phase transitions are briefly outlined and illustrated by some particular aspects of phase transitions in Pb3V2O8, Ba2NaNb5O15 and Au3+xZn. Lead orthovanadate is used as an example for the application of a procedure to distinguish between the static or dynamic…
Article Use of Laser-Raman Spectroscopy for Studies of Hydrogen Isotope Exchange over Metals* was published on February 1, 1989 in the journal Zeitschrift für Physikalische Chemie (volume 164, issue 2).
<div class="htmlview paragraph">An accelerated multifactor laboratory corrosion test with high correlation with respect to outdoor Volvo scab and field exposure is under way. It uses a mixture of SO<sub>2</sub> and NO<sub>2</sub> in ppm amounts at high humidity, combined with periodic soa…
Abstract dioxo-bis(phthaIocyaninato-niob(V))tribromid, [(PcNb)20 2Br]+BrJ, einem zweikernigen Phthalocyaninatokomplex Synthesis and Structure of i w-Bromo-/ i/-dioxo-bis(phthalocyaninato-niobium(V))tribromide, [(PcNb)20 2Br]~Br3 , i w -Brom o-^-dioxo-bis(phthalocyaninato-niobium (V))tribrom ide. Synthesis. Crystal Str…
Abstract An in situ X-ray diffraction (XRD) technique reported earlier was improved and employed to study the hydride formation in Pd and Pd–Au alloy foils and amorphous Pd–Zr alloy ribbons during cathodic hydrogen charging or its reverse process. The phase transformation from α- to β-PdHx in the Pd electrode, accompa…
Abstract The influence of high pressure up to 13 GPa on the optical transmission spectra of layered A III B III C crystals was investigated. The value of the pressure coefficient of the transmission spectra at 30% transmission is reported. Results indicate that these materials undergo a series of phase transitions in…
IR spectra of soluble poly-o-toluidine (POT) and poly-m-toluidine (PMT) have been studied. Preliminary assignment of their IR spectra is given by comparing their spectra in HCl and I2, doped states and in subsequently NH3 dedoped state with that in intrinsic state.
Article Cu Precipitations at the Surface of Crystalline Cu — Zr Alloys after Annealing in Hydrogen* was published on February 1, 1989 in the journal Zeitschrift für Physikalische Chemie (volume 164, issue 2).
Differential and total cross sections for the elastic scattering of electrons from gound-state silicon atoms have been calculated using the optical model. The optical potential includes the static potential, and the effects of exchange and polarization. The results are compared with the first Born approximation and sc…