Materials Literature
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Calcium is a member of the Alkaline Earth Family, members of which have atoms with well‐shielded nucleii and two valence electrons which are readily lost thereby forming divalent cations. The basic cation, Ca++, neutralizes acids, is essential for plants, and acts as a flocculator and precursor of granular structure o…
Polarized low-frequency Raman spectra of imidazole single crystals were measured with a He-Ne laser source. A new band at 172 cm−1 (Bg) was observed. An assignment for the lattice vibrations of imidazole crystals is proposed on the bases of this Raman data and far-infrared spectral data of Perchard and Novak, as well…
This paper highlights new prototype development work using copper-nickel alloys for vessel hulls and seawater intake piping systems. Initially, maintenance-free performance and economies that can be realized through the use of copper-nickel alloys in salt water environments are described. Data presented shows performa…
Abstract
Brittle fracture propagation-arrest characteristics of low C-Mn steel plates containing 0-5%Ni have been investigated by newly developed Tapered Double Cantilever Beam Test, which is a small size test having good correlation to large size Double Tension Test. The results obtained are as follows:1) Brittle fracture pro…
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…