Materials Literature
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Two related and not thoroughly resolved issues in biochemistry concern the role, if any, of enzyme surfaces in routine metabolism and the method by which metabolic intermediates move between enzyme active sites during multi-step degradation or synthesis. An important enzyme for which a detailed three-dimensional struc…
Calculations of the phonon spectrum of crystalline In 4 Se 3 in a model of central-pair interactions with neglect of the long-range forces are presented. The model developed contains five unknown parameters, which are determined from experimental values of the elastic moduli without consideration of the internal displ…
A study of cathodoluminescence spectra of silicon oxide films grown thermally on silicon is reported. It has been established that the cathodoluminescence properties of thermal films are nonuniform in depth and depend on the growth conditions and characteristics of the silicon substrate.
Seedless crystallization of Ge and GaSb melts was achieved under microgravity occurring in a drop-shaft capsule. It was observed that melts levitated in Ar atmosphere, formed into a spherical shape and were solidified instantaneously when they collided with the container quartz wall. X-ray diffraction pattern of these…
2-Diphenylphosphino-phenol was chosen as an ambivalent (hard/soft) chelating ligand for biologically important first row transition metals. The expected mode of complexation is relevant to trapping of metal ions in humic acids and related environmental ion exchange systems with phenolate functions. The 1:2 complex wit…
A polymer electrolyte membrane (PEM) reactor is described for use in Kolbe electrolysis: the anodic oxidation of an alkyl carboxylic acid with subsequent decarboxylation and coupling to yield a dimer, 2 RCOOH → R ‐ R + 2 CO 2 + 2 e − + 2 H + . Platinized Nafion® 117 is the PEM and functions simultaneously as the elect…
Abstract From a study on nitrogenation and hydrogenation characteristics of Laves phase-type intermetallic compound (TiFe2) and its surface modified composite (Ru/Al2O3/TiFe2), nitrogen molecule was found to be converted to ammonia via formation of TiFe2Nx at ambient pressure.
Experimental investigations on the removal of Cd(II) from aqueous solution were carried out using a foam separation technique with sodium lauryl sulfate and sodium laurate. The effects of pH, surfactant, and foreign ions on the efficiency of Cd(II) removal are discussed. Foam flotation with sodium laurate gave better…
The crystallization rate of two vinylidene fluoride(VF2)-tetrafluoroethylene(VF4) copolymers (VF2/VF4 90/10) (Cop-1), (VF2/VF4 86/14) (Cop-2) and their cocrystals of different compositions was measured by differential scanning calorimetry (DSC). At same undercooling (ΔT) the crystallization rate of cocrystals is faste…
High-temperature NiTi1−xHfx shape memory alloy thin films with Hf contents up to 29.9 at. % were obtained by laser ablation of different composite targets. The crystal structures and phase transformation behavior of the annealed thin films were characterized by x-ray diffraction and differential scanning calorimeter,…
A model including an isotopic exchange reaction of T+, HT, H2 and H+ dissolved in Flibe is proposed to explain the tritium release behavior from Flibe in an in-pile experiment. The temporal change of HT release rate for about two hours after the start of tritium generation observed by the experiment was well reproduce…
The kinetics of the formation of impurity complexes associated with selenium is investigated. The stationary density of complexes is obtained as a function of temperature and the density of selenium atoms that occupy silicon lattice sites. It is established that in the process of interconversions of electrically activ…
The syntheses are reported of the “extended reach” ligand 2,3,5,6-tetrafluoro-1,4-bis(2-pyridylsulfenyl)benzene (L 1 ), its 4-pyridylsulfenyl analogue (L 2 ), and their copper(II) complexes CuLX 2 (X = Cl or Br). X-ray studies have been carried out on L 1, L 2, and the complexes Cu(L 1 )Cl 2 ·2CHCl 3 ( 1 ) and [Cu(L 2…
The potential of palm oil fatty acid as an activator in natural rubber gum compounds has been studied. The curing characteristics and mechanical properties of natural rubber gum compounds with palm oil fatty acid as an activator were not much different compared to commercial stearic acid, especially at concentrations…
Correlations between the cohesive energy per mole and a crystallographic ratio in alkali chalcogenides are presented. The linear relationship is found to be valid so far for crystals with NaCl and antifluorite structure. This work highlights the significance of the anion radius in determining the cohesive energy in al…
Cleverly designed molecular building blocks provide chemists with the tools of a powerful molecular-scale construction set. They enable them to engineer materials having a predictable order and useful solid-state properties. Hence, it is in the realm of supramolecular chemistry to follow a strategy for synthesizing ma…
A system of diffusion equations is formulated for component and point defect concentrations near grain boundary (GB) in irradiated ternary alloy, in which a minor component has a small atomic size. A possibility of GB migration is taken into account. It is assumed that undersized atoms migrate via interstitial mechani…
A thermal-capillary dynamic model for Czochralski (Cz) growth of silicon single crystal is presented that accounts for convection in the melt, conduction in the crystal, and radiation from the melt free surface and crystal. The shapes of the crystal/melt interface, moving crystal, and free surface are governed by the…
A large-scale numerical simulation of a system of inelastic, rough, hard spheres of volume fraction ${\ensuremath{\varphi}}_{S}=0.565,$ starting from a disordered configuration in a Couette geometry, shows a transition to a layered state, which possesses long-range orientation order, after long run times. This phase t…
The toxicity to rats of Saudi Francoeuria crispa used in traditional medicine for the treatment of various disorders was investigated. Francoeuria crispa leaves were fed to rats at 2% and 10% of the diet for 8 weeks. In rats on the 10% F. crispa diet, there was a decrease in average body weight gain and feed efficienc…