Materials Literature
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The OH-stretching fundamental, and the first, second, and third OH overtone vibrations have been examined using pure, GeO2-doped, graded index, fused silica optical fibers having OH contents from <1 ppm to ≳103 ppm. The previously reported component substructure of the fundamental OH-stretching contour was foun…
A coupled Hartree–Fock method with individual gauge for localized orbitals (IGLO) proposed previously is reformulated and applied to the calculation of the magnetic susceptibility χ and the chemical NMR-shifts σ of various small molecules. The agreement with experiment is usually very good. Unlike in traditional metho…
Spin waves, elastic waves and their magnetostrictive coupling in KNiF 3 are studied as functions of temperature and of applied magnetic field by Brillouin scattering and ultrasonic measurements. The light scattering data provide the magnetic and elastic coefficients; in addition, they enable magnetostrictive coefficie…
From measurements of ultrasonic wave velocities the elastic constants of mercury selenide, HgSe, have been obtained as a function of hydrostatic pressure up to that (P t =9.5*10 8 Pa=9.5 kbar) at which the densification phase transition to the cinnabar structure takes place. At room temperature the elastic constants a…
A simple theoretical study of the linear electro-optic effect is presented. This semiclassical approach is based on the single-energy-gap model, the dielectric theory and the concepts of bond charge and effective ionic charge. A general expression is obtained for the electro-optic coefficient of a crystal and is appli…
Abstract Die Halbstufenpotentialefür die Redoxpaare der Phthalocyaninatokomplexe von Mg(II), Zn(II), Cd(II), Hg(II), Pb(II) und von Al(III), Ga(III) und In(III) mit axialem Cl‐Liganden sowie von Si(IV) mit zwei axialen t‐Amyloxy‐Liganden wurden bestimmt.
Abstract The plasticity and viscoplasticity of polycrystalline materials are studied analytically in terms of lattice dislocations, with the principal effects attributed to non-extended obstacles. Non-equilibrium statistical mechanics is used to describe the evolution of the dislocation structures during loading and…
The correct postal code is Edinburgh EH93JZ.Equation (2) should read 8 R' $(R)dR =P(T,R ') ""' 'exp -' + [1+O(e,T,R ')], To El d R «+'&~d «+ & (2p) &" +'& =2/&[
A single heat transfer measurement technique was used to determine the thermal insulating capabilities of four materials used in outdoor clothing-goose down, wool, polyester, and polyolefin. It was found that all provide very similar degrees of insulation.
Asahi Chemical started research and development of the ion-exchange membrane chlor-alkali process in 1966. Research was carried out on the effects of the type of ion-exchange group, ion exchange capacity, degree of crosslinking, membrane structure, caustic concentration, and many other parameters on current efficiency…
The past 15 years have witnessed an explosive growth in the literature on ionomers, i.e. ion-containing copolymers in which up to 15 mol % of the repeat units contain ionic groups. Two monographs have appeared on the subject(1,2), as well as proceedings of several symposia(3), in addition to a large number of individu…
Two approaches are proposed to describe a system of interacting rotors. The version developed of the self-consistent-field approximation, explicitly including simplifications related to the quasi-oscillatory nature of molecular motion in the orientationally ordered phase, makes it possible to consider anharmonic effec…
Abstract Two techniques for eliminating the unsiderable effect of anodic protection on installations connected to the protected equipment were tested. Model measurements were carried out in a 50% solution of sulfuric acid at 20°C with a type FeCr 18 Ni9 Ti stainless steel under potentiostatic conditions. The use of an…
Abstract Chain extension of partially neutralized carboxyl‐terminated liquid polybutadiene (PB) with bisepoxide was investigated by the carboxyl–epoxide reaction. The partially neutralized liquid PB were prepared, by the partial neutralization with MgO and CaO, from a carboxyl‐terminated liquid PB (Hycar CTB 2000X162)…
The measurement of the dielectric loss of insulating material or electrical apparatus with the Schering bridge at power frequency is one of the most fundamental dielectric tests for evaluating insulation behavior. It has been pointed out that a negative error or even an apparent negative reading of tanδ may result if…
Abstract Four laboratory prepared catalysts (Ni/Al 2 O 3 , NiNaY‐uncalcined, NiNaY‐calcined, NiCaY‐calcined) and a commercially available catalyst G‐87 were studied for their deactivation behavior over a period of 24 h at 573 k for various H 2 /CO ratios (3.1, 3.8, 6.4 and 24.5). The results indicated that the activit…
Abstract The formation of polyelectrolyte complexes of glycol chitosan (GlChi) with sodium salts of dextran sulfate (DS), carboxymethyl cellulose (CMC), polygalacturonic acid (GalUA) n , and alginic acid (AlgA) has been studied. The number of ionizable groups per pyranose ring and the degree of dissociation as a funct…
<div class="htmlview paragraph">The purpose of this paper is to describe the advantages and validity of substituting the high-performance zinc casting alloys, ZA-12 and ZA-27, for bronze in selected low-speed, medium temperature bearing and bushing applications.</div> <div class="htmlview paragraph">…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase-dependent stereochemistry and chemical activation in the thermal decomposition of 2,3-diazabicyclo[2.1.1]hexeneMoon Ho Chang and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1982, 104, 4, 1131–1132Publication Date (Print):February 1, 1982Publication History Publishe…
The ground-state transition is observed in the double-charge-exchange reaction $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $^{18}\mathrm{C}$) $^{48}\mathrm{Ti}$ at 100 MeV. A mass excess of 24.82 \ifmmode\pm\else\textpm\fi{} 0.30 MeV is measured for $^{18}\mathrm{C}$.NUCLEAR REACTIONS $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $…