Materials Literature
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The direct analysis of dissolved spent nuclear fuel by inductively coupled plasma mass spectrometry (ICP-MS) allows the elemental and isotopic composition of the irradiated fuel to be determined without any chemical separation. A qualitative evaluation was carried out on the effects of fission, β-decay and neutron-cap…
The variation of the linear electro-optic effect in (-)-2-(α-methylbenzylamino)-5-nitropyridine with the wavelength of the incident light at room temperature has been measured. The reduced half-wave voltages have been found to have the values 2.1, 2.8, and 6.0 kV at 488, 514.5, and 632.8 nm respectively and the corres…
The crystal structure of hexylheptahydrooctasilasesquioxane C6H13(H7Si8O12) has been determined by single-crystal X-ray diffraction and compared with the structures of H8Si8O12, [Co(CO)4(H7Si8O12)] and (CH3Si8O12. The monosubstituted Silasesquioxane molecules have a crystallographic C1symmetry. The local symmetry of t…
Abstract This paper presents information on the preparation of the network polyester films from glycerol (Y g ) and aromatic dicarboxylic acids of phthalic anhydride (P), dimethyl isophthalate (I) and dimethyl terephthalate (T), as well as aliphatic dicarboxylic acids of adipic, sebacic, 1, 10‐decanedicarboxylic and 1…
Many methods have been proposed for the determination of the hysteresis loops of magnetic materials, and many mathematical approaches have been proposed to find a good model for the hysteresis phenomenon. However, very few attempts have been made to determine the parameters of the hysteresis model experimentally. This…
The syntheses and X-ray crystal structures of the isoleptic ytterbium complexes [Yb(tdmp)2]O3SCF3, 1, and [Yb(tdmp)2], 2, are reported [tdmp = hydridotris(3,5-dimethylpyrazol-1-yl)borate]; the average metal to ligand distance increases by 0.16 Å(ca. 7%) upon reduction.
The reaction of oxoiron(IV) tetra(2-N-methylpyridyl)porphyrin (OFeIVT2MPyP), generated from iron(III) tetra(2-N-methylpyridyl)porphyrin and tert-butyl hydroperoxide, with 3-cyanophenol in aqueous solution (pH 7.7) shows first-order dependence on the concentration of the phenol and the oxidant. The pH dependence of the…
The kinetics and mechanism of the oxygenation of Mn(TMP)Cl, Mn(TDCPP)Cl and Mn(Br8TMP)Cl by Ph4PhSO5 has been investigated in 1,2-dichloroethane and acetonitrile. In both solvents the reaction takes place only in the presence of species acting as axial ligands of the manganese porphyrins, e.g. imidazole or 4-tert-buty…
Because of the wide variety of phenomena associated with the split of two-phase flow at junction, the problem has been approached from two extreme ends. High quality annular or stratified flow and low quality, stratified or bubbly flow are considered separately. Data, phenomena and models are considered for each case.
Protein kinase CK2 subunits alpha and beta were expressed either separately or together in a bacterial expression system (pT7-7/BL21(DE3)) and purified to homogeneity. After mixing the subunits, a CK2 holoenzyme (alpha 2 beta 2) was spontaneously reconstituted, which displays identical features as the native enzyme. T…
Several diffractive optical elements that operate in the infrared are presented. The microrelief structure is either a V-groove or binary lamellar and the features are of the size of one wavelength or below. The applications of these elements are beam deflectors, beamsplitters, beam attenuators, and polarizers.
Abstract Phospham is an iminophosphazene polymer of unusually high thermal stability. We have found that phospham imparts a substantial level of flame retardancy to nylon‐4,6, a high‐melting crystalline engineering thermoplastic. It did not appear to produce degradation of the polyamide in the processing temperature r…
Abstract Daß Mikroorganismen organische Werkstoffe angreifen, ist seit langem bekannt. Daß sie auch mineralische, metallische und synthetisch‐organische Werkstoffe angreifen können, ist eine relativ neue Erkenntnis. Es wird geschätzt, daß mindestens 20% aller Korrosionsschäden an Metallen und Baustoffen mikrobiell bee…
An inversion in the cholesteric phase has been found to occur with change in temperature. Additionally, the material under investigation was found to exhibit unusual ferroelectric properties on cooling from the chiral nematic phase. We report the synthesis and physical properties, including pitch and polarization data…
In this study, compositional dependence of age hardening characteristics and high temperature tensile properties is investigated in binary magnesium alloys with 5, 10, 15 and 20 mass%Gd or Dy. Considerable age hardening is recognized in alloys with higher content of Gd or Dy. In case of equal rare earth metal contents…
31 P MAS and 11 B NMR have been used to investigate the structure of glass samples with the chemical composition (1-x)NaPO 3 -xNa 2 B 4 O 7 . The 31 P resonance spectra present several Gaussian lines which are due to different environments around the PO 4 units. In addition to the phosphate units occuring for R≥1 in t…
The electrochemistry of polyaniline (PANI) films deposited on platinum microelectrodes has been studied in a wide pH region, at constant ionic strength. Cyclic voltammograms, recorded at a sweep rate of 100 V s–1 indicate that the films remain electroactive at pH values as high as 9 provided that the films are only sw…
The decrease in efficiency of ZnS:Ag,Al phosphor powders under high cathode-ray excitation densities has been investigated in a wide range of Ag concentrations (18–1560 ppm) with the Al/Ag ratio fixed at 1.5. Two distinct regions have been observed in this saturation behavior. For low Ag concentrations up to some 100…
Abstract To produce reaction products with 100% chemical selectivity, and to attain much higher turnover rates and number of turnovers, the development of new methods of catalyst preparation are necessary. Precise control of particle size, the separation between catalyst particles and their superior chemical and therm…
Modeling of sacrificial layer etching can be done by combining the diffusion rates of etchants in solution and the chemical reaction rate. Steady‐state diffusion is estimated for diffusion coefficients in water on the range of as observed from an independent experiment. Likewise, the chemical reaction rates (or initia…