Materials Literature
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Abstract The complex compliance in extension of gels of poly(vinyl chloride) (PVC) in di(2‐ethylhexyl) phthalate (DOP) and in tricresyl phosphate (TCP) was measured over the frequency range from 0.6 to 0.006 cps and the temperature range from −66 to 65°C: the weight fractions of DOP and TCP in the gels were 0.32, 0.40…
Abstract The dielectric properties of natural rubber, synthetic polyisoprene, and polybutadiene samples crosslinked with sulfur and of natural rubber samples crosslinked simultaneously with sulfur and dicumyl peroxide were studied. In the investigated systems, the number of polar groups in unit volume and the crosslin…
The magnetization and anisotropy properties of single crystals CuNi‐18H, (Ba5.1(Ni1.1Cu0.4)Ti2.7Fe12.3Mn0.4O 31) and MgZn‐18H, (Ba5.4(Mg1.3Zn0.7)Ti2.9Fe11.7 O31) solid solution hexagonal ferrites have been investigated in fields up to 16 kOe and temperatures from 4.2 to Tc. Both compositions exhibit an easy plane of m…
Japan Synthetic Rubber (JSR) Co. has developed a new method to obtain 1,2-polybutadiene in which the 1,3-butadiene monomer is polymerized with special catalysts in a polar solvent [1]. The 1,2-vinyl structure content exceeds 90% [2,3] with a molecular weight of approximately 150,000 [4].
1,19-Di-iodo-1,19-dideoxybiladienes-a,c bearing acetic and propionic acid residues at the β-positions have been prepared for the first time, and transformed into corroles and aza-porphyrins whose substitution pattern corresponds to those of uroporphyrin III and 12-decarboxyuroporphyrin III; nickel tetradehydro-corrins…
Thermal-shock resistance of hard porcelain samples are dependent on the concentrations of the crystalline phases (mullite and quartz) and the glassy phase and also on the size of mullite crystals. Internal stresses originating in the samples from the thermal expansion mismatch between the phases also influence the the…
We have had the opportunity to apply the most widely used methods of inclusion rating; and, from our experience, it appears that all metallographic methods, including the use of the quantitative television microscope, give roughly equivalent results as far as heat to heat comparison is concerned. In this respect, the…
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.