Materials Literature
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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…
We made the measurements of dielectric constant, pyroelectricity, magnetoelectric effect and magnetization of SmMn2O5 single crystals. From the results, we conclude that SmMn2O5 is ferroelectric below 35.5 K, and that it undergoes another phase transition at 28.8 K. The change in both electric and magnetic structures…
Abstract Double networks of a black-filled natural rubber composition have been prepared by partially curing a sheet, stretching it, and then completing cure. Upon release, a double network retracts to a residual extension ratio, α r . Samples cut perpendicular to the stretch direction have stress—strain responses lik…
Misorientations and grain boundary planes of twin boundaries are determined by the TEM technique in annealed copper with a nearly random texture. Straight segments on the long sides of twins are associated with {111} planes. The potential of TEM and SEM methods for determination of GB planes is discussed.
A simple physical model of ≈1 eV–35 keV electron scattering in insulating polymers was proposed. A new correction to Slater's exchange potential was used for the description of low-energy elastic electron scattering. The simulation of electron trajectories was performed using the Monte Carlo technique. The integral an…
The electronic and nuclear contributions to the third-order nonlinearity of glasses are separated by use of 100-fs pulses in a time-resolved heterodyne optical Kerr effect technique. A direct estimate of the relative strengths of electronic and nuclear contributions was made by the comparison between the nuclear contr…
Kristalline Proben der tieffarbigen Titelverbindungen können, ausgehend von stöchiometrischen Ansätzen, direkt aus den Elementen dargestellt werden. Sie unterscheiden sich von den bisher bekannten Alkalimetallthioindaten insbesondere dadurch, daß sie bezüglich Indium gemischtvalent sind. Das heißt Indium liegt in ihne…
The effects of various vulcanization systems and fillers in epoxidized natural rubber (ENR) at 50% epoxidation (ENR 50 compounds) were examined. ENR compounds cured with the semi-EV (efficient vulcanization) system showed the shortest cure and scorch times but the highest torque values. White rice husk ash (WRHA) fill…
Manganese(II)chloride, bromide, acetate and L-lactate were used as catalysts for the polymerization of L-lactide. All polymerizations were performed in bulk and despite a high reaction temperature (150°C), long reaction times (192 hours) were needed to achieve nearly complete conversions. Mn L-lactate was found to be…
The dielectric propereties of smectic liquid crystal mixtures containing chiral dopants derived from trifluoromethylated pyranose were studied. In every mixture, a large dielectric response due to the Goldstone mode was observed, indicating the smectic C * phase, although two switching current peaks indicative of the…
Materials used for spacecraft and space structures in near-Earth orbit are subject to severe environmental effects including high vacuum conditions, hot and cold extremes temperature, strongly oxidizing atomic oxygen environments, and high fluxes of energetic electrons, ions, neutrals and photons. Instrumentation deve…