Materials Literature
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Sorption kinetics of the jute—water-vapor system have been followed gravimetrically using a sorption balance under controlled temperature and humidity conditions and absorption isotherms determined from the equilibrium water ' contents. The sorption kinetics are dependent on the initial water content of the jute sampl…
The volume change due to substitutional and interstitial helium atoms : n V, Fe, Mo, Ta, and W has been determined using the displacement fields from previously reported model calculations. Interstitial He produces a lattice expansion of less than one atomic volume in all metals studied, ranging from 0.4 to 0.9 Ω. The…
Abstract
Davydov splitting of the abosrption spectra of molecular crystal is considered from the standpoint of the law of conservation of the first spectrum moment. Various models of states of crystal excitations are applied to the analysis of the law: Davydov one-particle model of rigid lattice, Rashba two-particle model of v…
Kinetic analysis demonstrated that the irreversible inhibition of nucleoside diphosphate kinase of Escherichia coli by desdanine proceeds via a reversible Enzyme-Inhibitor complex. It is known that pyruvate kinase of E. coli becomes inactive upon prolonged dialysis in the absence of a reducing reagent, such as dithiot…
Abstract The precipitation of magnesium, calcium, strontium and barium oxalates and of manganous, ferrous, cobalt, nickel and copper oxalates was studied from equivalent aqueous solutions at 22°C: the initial overall concentrations (C) generally varied from 0.001 to 0.2 M and the saturation ratios ( S mox ) varied fro…
Nuclear-acoustic-resonance studies of the absolute intensity of the signals and of the angular dependence of their second moments have been made in single crystals of niobium for the electric quadrupole transitions $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\fi{}1$ and $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\f…
Dielectric properties of (K 1/3 Pb 2/3 )(Zn 2/9 Nb 7/9 )O 3 with perovskite type are investigated in the frequency range from 1 kHz to 80 MHz. The dielectric constant measured at 1 kHz is 500 at –200°C, and reaches a peak of 3300 at –70°C. With an increase in frequency, the maximum of the dielectric constant is observ…
La résonance en intensité Raman a été étudiée pour plusieurs phonons du spectre de SbSI dans les phases ferro-électrique et para-électrique. Les intensités ont été corrigées par des mesures directes du coefficient d'absorption et calibrées par un cristal de référence. L'allure de la courbe de résonance est en très bon…
K α And KβX-ray emission spectra of V (metal), [V(pd)3](pd = pentane-2,4-dionate), VF3, VO2, V2O5, [VO][SO4], [NH4][VO3], and [NH4][V3O8] are reported. It is argued that peaks of higher energy than Kβ1,3 are due to transitions involving molecular orbitals with Vp character rather than V 3d. The relative intensities an…
In the 60 years since its discovery, X-ray diffraction has become established as one of the most important techniques in the study of crystalline materials for fundamental and applied research and for routine analyses. Perusal of the literature in scientific fields such as chemistry, metallurgy, mineralogy, and pharma…
The photo-oxide of 1,3-diphenylisobenzofuran, obtained by dye-sensitised photo-oxidation in ether, has several isomers including an arene oxide and an oxepin, formed in a new peroxide rearrangement.
Optimum fiber orientations in symmetrically laminated cylindrical shells under combined loadings are investigated. The theory of maximum work is used as the strength criterion. A modified golden section method is employed for the optimization. The glass-epoxy composite is taken for numerical examples.
La structure cristalline de la zéolite barrérite [(Ca₁,₇ Mg₀,₃ Na₁₀,₉ K₂,₁) (Al₁₆,₄Si₅₅,₄) O₁₄₄] • 51,6H₂O a été étudiée au moyen des rayons X : le groupe spatial est Amma avec a = 13,643 (2), b = 18,200 (3), c = 17,842 (3) Å. La charpente de la barrérite est identique à celles de la stilbite et de la stellérite. L'ab…
for the transformation energy. Electrical resistivity is found to decrease by 17 percent during the transformation. Estimated inaccuracies of the measured properties are: 10 K for the transformation temperature, 5 percent for the transformation energy, and 2 percent for the electrical resistivity.
Purely instrumental contributions to the angular dependence of XPS peak intensities are considered theoretically and experimentally, and it is found that peak-ratio angular distributions should be free of all instrumental effects, and thus amenable to more direct analysis in terms of specimen-related properties. This…
Invar alloys are widely used as materials for precision instruments. The practical Invar alloys are all ferromagnetic, and the ferromagnetism of these alloys often limits the scope of their application.In recent years, therefore, considerable attention has been directed to the research and development of nonferromagne…
The major components of gas turbines and their materials requirements are outlined. The properties, advantages, and limitations of materials which have been and are being used in gas turbines are then described in the following groups: aluminium alloys, magnesium alloys, titanium and its alloys, steels, and finally ni…
The crystal structure and internal defects of the banded martensite in a quenched Cu-24.5 wt%Sn alloy have already been investigated by Nishiyama et al. However, since their results are rather unexpected in some respects, the crystal structure and the morphology were reexamined by means of electron microscopy and sele…
Effects of alloying elements on the pitting corrosion resistance of 17Cr-16Ni steels with and without 4% Mo were evaluated by the corrosion rate in 10% FeCl3·6H2O and 4% NaCl added with hydrogen peroxide and by the polarization measurement in 0.1N NaCl+0.1-0.25N Na2SO4 at 40°C. The elements, the content of which was v…