Materials Literature
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Predictive calculations of the physical properties of fibrous preforms and composite parts require an appropriate description of the preform geometry. Most internal dimensions of a preform are set during its manufacturing through mechanical interactions occurring between the tows and threads. However, the global shape…
Optical characteristics of quartz glass KU-1 were investigated after irradiation in a water-pull nuclear reactor IR-8 up lo the fluence of 6 × 1019n/cm2. Quartz samples - cylinders with diameters 16 mm and heights 8 mm - were placed in two aluminum containers active zone in one of the central channel of the reactor IR…
Abstract Siltstones from the Precambrian Freda Formation in Wisconsin have been studied by scanning, scanning-transmission and analytical electron microscopy (SEM, STEM and AEM), and X-ray diffraction (XRD). XRD data for drill core samples show a change from smectite-rich Illite-Smectite (I-S) in shallow samples to il…
Slow electron transfer to manganese(iii) porphyrins results when the macrocycle deviates from planarity. This was demonstrated by measuring the kinetics of homogeneous electron transfer from a series of semiquinone radical anions to synthetic manganese porphyrins (shown schematically; R1=H, Cl, F; R2=H, F). Three of t…
A schematic model is proposed for understanding the boson peak as a consequence of the coupling between slowly decaying density fluctuations and the transverse sound modes that develop in the amorphous solid. The present analysis demonstrates that the nature of the dynamics of defect densities in the disordered system…
Results from the crystalline and microstructure study of the φ′- and δ-AlON spinel phases by X-ray diffraction, neutron diffraction and standard-resolution transmission electron microscopy techniques are reported. Several samples having different compositions in mol % AlN were considered. A structural model is propose…
This paper reports the application of image analysis methods we developed previ ously to characterize fiber diameter distribution in nonwovens using a "distance trans form." The method is verified by a series of simulated nonwoven images as well as some real web images used previously, including a carded web, a relati…
The crystal structure of the yellow pigment 2,5-dihydroxybenzo[ de ]benzo[4,5]imidazo[2,1- a ]isoquinolin-7-one (C 18 H 10 N 2 O 3 ) was determined from powder data. The crystal structure was solved by minimizing the intermolecular energy starting from random packings. Subsequently, the structure was refined by rigid-…
The glass transition temperatures of binary mixtures of polyamines and polyalcohols are investigated by differential scanning calorimetry (DSC). For all systems, the composition dependence of the glass transition temperature T g shows clear maxima, in stark contrast to those of polyalcohol−polyalcohol mixtures reporte…
Studies on fabrication and thermal conductivity of B4C/Cu cermet were made to obtain high performance neutron absorber materials for Liquid Metal-cooled Fast Breeder Reactor (LMFBR). A mixed powder of B4C and Cu was mechanically blended at high speed thereby a coating layer of Cu was formed on the surface of B4C powde…
Abstract The catalytic hydroxylation of aliphatic hydrocarbons by m-chloroperbenzoic acid (MCPBA) has been studied in the presence of elecrtron-deficient iron(III) porphyrin complexes. High yields of alcohol products were obtained with small amounts of ketone formation under mild reaction conditions. The stereospecifi…
Over-end unwinding involves pulling yam from a fixed package to be used in textile processes such as knitting, sewing, twisting, weft insertion in weaving, and doubling. During unwinding, the yam slides on the package surface and lifts off into the balloon formed between the package and the guide eyelet. Variations in…
The electrical properties such as water tree length, electrical conduction, ac breakdown strength and space charge of silane crosslinked polyethylene (SXLPE) were investigated, with a purpose to compare this material with ordinary dicumyl peroxide (DCP) crosslinked polyethylene (XLPE). Experimental results show that S…
We have detected an intermediate in the process of singlet-oxygen-sensitized delayed fluorescence (SOSDF) using tetra- tert -butylphthalocyanine (Pc) as the fluorescer and C 60 as the sensitizer. The observed intermediate is dependent on the concentrations of Pc, 1 O 2, and 3 O 2, as is SOSDF. By modeling the kinetics…
We present a simple two-dimensional model system which tends to organize itself in the form of a quasiperiodic state. The system is composed of one sort of particles only, with mutual interactions that strongly deviate from the standard Lennard-Jones-type of potentials at intermediate distances. The dynamics of this s…
Magnetic properties of the Laves phase compounds $\mathrm{Lu}({\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{)}_{2}$ $(0.10\ensuremath{\leqq}x\ensuremath{\leqq}0.22)$ have been investigated under the duplicate conditions, i.e., high magnetic fields with high pressures. The pressure effect on the Curie temperature $…
Time domain energy dispersive X-ray absorption spectroscopy provides a powerful probe of changes in molecular structure that occur during photoinduced electron transfer reactions. In this study a diporphyrin model for electron transfer within modified heme proteins is examined using this technique. Transient optical a…
The structure of lead hafnate has been accurately determined at 10 K and at room temperature by two different diffraction methods: neutron powder and electron diffraction. Results from the two methods are in good agreement. The structure is shown to be isomorphic to the lead zirconate structure, although its behaviour…
In this paper, an heuristic algorithm is presented for the evaluation of the parameters of additive-Weibull distributions having more than two elementary functions, which is a necessary condition when testing complex insulating structures with different partial discharge (PD) sources. The algorithm has, in principle,…
The influence of the strain rate on the superelastic behaviour associated with the martensitic transformation is investigated by tensile tests for TiNi shape memory alloy. The results are summarized as follows. The increase in the temperature due to the stress-induced martensitic transformation measured by a non-conta…