Materials Literature
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Undoped p-GaSe layered single crystals were grown using Bridgman technique. Thermally stimulated current measurements in the temperature range of 10-300 K were performed at a heating rate of 0.18 K/s. The analysis of the data revealed three trap levels at 0.02 , 0.10 and 0.26 eV. The calculation for these traps yielde…
The low-temperature thermally stimulated luminescence (TSL) in both porous silicon (PS) layers on Si substrate and PS powder has been found in the 4.2–300 K temperature range. The dependence of the TSL effect on the wavelength and temperature of an excitation was studied in detail. The shape of TSL glow curves display…
Abstract Further investigation of the synergistic effect of smoke suppression between cuprous oxide and molybdenum trioxide in rigid poly(vinyl chloride) (PVC) was carried out by using a cone calorimeter (cone) at a high incident heat flux of 50 kW m −2 . Experimental data derived from the cone calorimeter indicated t…
A new method is demonstrated for the quantification of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides. It is based on the linear combination of two reference X-ray absorption near-edge structure (XANES) spectra at the Ti K edge. The proper selection of a Ti-O-Si reference material is most important for the successfu…
Novel dinuclear lanthanide complexes, [REL 3(phen)]2 (where RE = La, Ce, Pr, Nd, Sm, Eu, Gd; HL = trans-2,3-dimethylacrylic acid, phen = 1,10-phenanthroline), have been synthesized. The single crystal structures of [LaL3phen]2 and [GdL3phen]2 have been determined by X-ray crystallography, which shows that they are iso…
High-resolution transmission electron microscopy (HRTEM) was used to characterize the cross-sectional and planar atomic structures and bonding states of highly tetrahedrally bonded amorphous carbon (ta-C) films, particularly concentrating on the surface layer and interface between substrate and pure ta-C film. A ``san…
The objective of this project is to gain insight in the behavior of the non-woven felt commercially know as Dyneema Fraglight. The following activities were performed during the period covered by this report: 1) Tests at different temperatures and orientations. 2) Search of characteristic length of fiber and fabric. 3…
Fluorine-chlorine-doped silicon-dioxide films have been deposited at 200 °C by the remote plasma-enhanced chemical-vapor-deposition technique using SiF4 and SiCl4 as silicon precursors in combination with O2/He/H2 mixtures. The behavior of the deposition rate and structural properties of the films as a function of SiF…
The pitting potential Epit of 18/8 CrNi stainless steels with different sulfur content (0.003, 0.017 and 0.29%) has been determined from potentiodynamic polarization curves in deaerated neutral solutions (0.1 M NaCl and 1 M Na2SO4 + 0.1 M NaCl) with nominally identical chloride content. Epit decreased with increasing…
Lithium or any lithium alloy like the lithium lead alloy Pb-17Li is an attractive breeder material used in blankets of fusion power reactors because it allows the breeding of tritium and, in the case of self-cooled blankets, the transfer of the heat generated within the liquid metal and the walls of the cooling ducts…
Abstract Poly(ethylene terephthalate) (PET) and poly (butylene terephthalate) have been modified by diamide units (0.1–1 mol%) in an extrusion process and the crystallization behavior studied. The diamides used were: for PET, T2T‐dimethyl (N, N′‐bis( p ‐carbomethoxybenzoyl)ethanediamine) and for PBT, T4T‐dimethyl (N,…
Crystal structures of(Ba1-xLax)2In2O5+x (x=0.00, 0.20, 0.30, 0.40, 0.50) were analyzed by EXAFS and the powder X-ray Rietveld method. A Fourier transform of In K-edge EXAFS data from (Ba1-xLax)2In2O5+x showed a peak between 1.2 and 2.0 A attributed to the nearest oxide ions around In3+ cation. The peak as back-Fourier…
Abstract The synthesis of a new cylindrical macrotricyclic ligand (L) based upon two 1,4,7,13-tetramethyl-1,4,7,10,13,16-hexaazacyclooctadecane rings connected via two azobenzene pillars is described. The ligands displays photoelastic properties: light absorption at 366 nm produces trans→cis isomerization of the azobe…
In situ Young's modulus measurements and synchrotron radiation‐energy dispersive diffraction have been used to study changes in high‐alumina castables subjected to heat treatment from room temperature to 1600°C. Particular attention was paid to the hydrate “conversion” process and the effects of high temperature.
We have studied the temperature variations of the EXAFS spectra of three Fe(II)/triazole-based spin transition polymeric compounds compared to a monomer belonging to the same family. These compounds have various temperatures of transition and hysteresis loop widths. In the three polymers, the Fe-Fe-Fe alignment, detec…
The computer systems for planning and management of reactor decommissioning were developed for effective implementation of a decommissioning project. The systems are intended to be applied to construction of work breakdown structures and estimation of manpower needs, worker doses, etc. based on the unit productivity a…
Residues 1--10 of porcine fructose-1,6-bisphosphatase (FBPase) are poorly ordered or are in different conformations, sensitive to the state of ligation of the enzyme. Deletion of the first 10 residues of FBPase reduces k(cat) by 30-fold and Mg(2+) affinity by 20-fold and eliminates cooperativity in Mg(2+) activation.…
The present work was initiated to measure and compare tensile strengths (i.e., spall thresholds) of five different types/varieties of silicon carbide materials. Two of these materials were sintered, and the remaining three were hot-pressed. Three types of silicon carbides (one sintered by Sohio and. the other two hot-…
A comparison on the molecular heterogeneity of two whole metallocene short-chain branched polyethylenes (SCBPEs) with different hexene comonomer (butyl branching) content and their Cross-Fractionated (CF) fractions has been made. As elucidated by differential scanning calorimetry (DSC) thermal segregation experiments…
We report the results obtained from the studies of cholesteric gratings doped with a dichroic guest-host dye, G206. First, a dye-doped planar cholesteric texture was switched to a fingerprint texture. Using the pump (Ar + laser)–probe (He–Ne laser) technique, we then studied the diffraction characteristics of the Rama…