Materials Literature
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This paper describes the structure of bovine pancreatic ribonuclease A, refined by a restrained parameter least squares procedure at 2.0 A resolution, and rebuilt using computer graphics. The final agreement factor (formula see text) is 0.159. The positions of the 951 main chain atoms have been determined with an esti…
Abstract Acetyl sulfate was used as sulfonating agent for the sulfonation of cis ‐1,4‐polyisoprene. IR and NMR spectra showed that the sulfonation was accompanied by extensive cyclization. A series of DSC and loss tangent studies of both the sodium salts and the methyl esters was undertaken. It was found that cyclizat…
Experiments on the Mössbauer effect of 125 Te and the X-ray diffraction for antiferromagnetic MnTe 2 were performed. Temperature dependence of the spin direction has been observed for a magnetic ordering of the first kind fcc lattice. The angle between the spin direction of Mn and the principal axis of electric field…
The electric-field-induced liquid-crystal (LC) cholesteric-to-nematic (C-N) phase transformation and its relaxation (N-C) are examined using the anisotropic color absorption properties of a dichroic dye dopant. A tristability is observed. The stable memory associated with the tristability has potential application to…
Abstract Raman spectra of two hydroxy azoic model compounds: 3,5‐dimethoxy‐4‐hydroxyazobenzene and 2,6‐dimethoxy‐4‐hydroxyazobenzene are compared. These compounds exist as the pure azo and pure hydrazone forms respectively, thus allowing the assignment of numerous Raman Bands characteristic of each tautomer. The usefu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination and reduction of nitric oxide on a cobalt tetraphenylporphyrin imidazole complexKazuhiko Tsuji, Masahiko Imaizumi, Akira Oyoshi, Isao Mochida, Hiroshi Fujitsu, and Kenjiro TakeshitaCite this: Inorg. Chem. 1982, 21, 2, 721–725Publication Date (Print):February 1,…
Abstract A pilot-size brine handling system was operated from Magmamax Well 1 in southern California to study the characteristics of siliceous scale deposition and to evaluate the possibility of treating the brine with chemical additives to control scaling. The rates of formation, chemical constitution, and morphology…
With a view to examining the embrittlement behavior of Zircaloy due to inner surface oxidation occurring in an LWR loss-of-coolant accident, ring-like Zircaloy-4 cladding specimens were heated at the isothermal oxidation temperature ranging 890~1,194°C in an environment of stagnant steam, which simulated the atmospher…
The properties of p-Zn3P2/n-ZnO heterojunctions prepared by sputter deposition of ZnO onto Zn3P2 substrate are investigated. Analysis of the experimental data indicates an interface state density greater than 1012 cm−2 and a capture cross section on the order of 10−13 cm2. Using the experimental data a band diagram fo…
Ag- and Cu-doped amorphous As 2 Se 3 and GeSe 2 were studied by XPS. The binding energies and/or Auger kinetic energies were determined for films of Ag and Cu, and amorphous films of Ge, As, Se, GeSe 2 , As 2 Se 3 , Ag-doped GeSe 2 , Ag- and Cu-doped As 2 Se 3 . The chemical shifts revealed that electrons are transfer…
Abstract The Mössbauer effect of Fe 57 was used to probe and characterize iron ions adsorbed on the interlayer surfaces of montmorillonite. Measurements were performed with Fe- and Ca-saturated mont-morillonites. At 210°K the intensity of the Fe 2+ line was greatly reduced, apparently due to the melting of interlayer…
Thermally stimulated conductivity (TSC) and thermally stimulated luminescence (TSL) of spinel single crystals exposed to ionizing radiation have been studied. TSC exhibits peaks at 70, 125, and 340 °C whereas TSL peaks occur at 70 and 260 °C. The 70 °C peak has an activation energy of 0.95 eV and is due to electron re…
Crystals of glycylglycylglycine (C6H-11N3O4), grown from an aqueous methanol solution, are triclinic, space group P1, with the unit cell dimensions (at 22 +/- 3 degrees) a = 11.656(3), b = 14.817(3), c = 4.823(2) A, alpha = 88.45(3), beta = 95.96(3), gamma = 105.42(3) degrees, Z = 4 (with two molecules in the asymmetr…
The effectiveness of deposits for decreasing hydrogen absorption by the substrate is discussed in terms of a surface or "catalytic" effect and the well‐known barrier effect. Data are presented on the extent of hydrogen absorption during electrodeposition of Sn or Cd onto an Fe substrate, and, subsequently during elect…
The effect of pressure on dc breakdown voltage of contaminated porcelain insulators and glass models was investigated in the range of 13 to 100 kPa. The study revealed that flashover voltage decreases nonlinearly with lowering of pressure. Arc characteristics under different pressure conditions were studied and the th…
The Warren–Averbach profile analysis was modified to study the deformed state of Al. The X-ray diffraction effect of dislocations locating on cell boundaries may be treated as `size broadening', while that of dislocations inside cells is `strain broadening', which may be treated with Wilkens's theory. X-ray Debye prof…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation in pyrosulfate melts. 1. Potentiometric, cryoscopic, and spectrophotometric investigations of the systems potassium disulfate-potassium sulfate and potassium disulfate-potassium sulfate-vanadium pentoxide in the temperature range 410-450.degree.CNiels Holge…
The first unambiguous evidence is presented that ${\mathrm{H}}^{\ensuremath{-}}$ ions are the main electron traps responsible for the long-lived phosphorescence observed at 2.3 eV near room temperature in thermochemically reduced MgO.
The elastic moduli and fracture toughnesses of a series of PbO‐ZnO‐B 2 O 3 glasses were measured for different PbO/ZnO ratios and for B 2 O 3 contents from 30 to 70 mol%. Substituting ZnO for PbO increased both the elastic modulus and fracture toughness at all B 2 O 3 levels with the fracture toughness being related t…
Abstract The number of commercial blends has skyrocketed in the past several years and the trend toward blending—in preference to the creation of new polymer structures—has been firmly established. This paper analyzes the reasons for this growth; the types of commercial products, their manufacturer, and their applicat…