Materials Literature
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The high-operating-temperature fuel duty, 18-month and longer-cycle lengths, and higher burnups have put increased demands on PWR fuel during recent years. As a result of these demanding operating conditions, the corrosion and dimensional stability of PWR fuel assembly skeletons are being challenged. To understand the…
An investigation into the shock sensitivity of hexanitrostilbene (HNS) has been carried out. A Q‐switched Nd:YAG laser was used to launch miniature flyer plates from substrate‐backed aluminium films. The impact produces a shock with duration of the order of 1 ns and pressure of the order of 10 GPa. The explosive sampl…
Dendrimers are globular, hyperbranched polymers possessing a high concentration of surface functional groups and internal cavities. These unique features make them very useful in many biomedical applications, especially as carrier molecules. In this study, the interaction of tryptophan and 1-anilinonaphthalene-8-sulfo…
A near-room temperature active magnetic regenerative refrigerator (AMRR) was designed and built using a high-temperature superconducting (HTS) magnet in a charge-discharge cycle and a gadolinium-packed regenerative bed as the magnetocaloric component. Current to the HTS magnet was ramped periodically from zero to 100…
Sediments contaminated with organics compounds due to past disposal practices threaten the environment and require remediation. This study was an attempt to develop a technology to decontaminate organics in dredged sediments using ultrasound coupled with vacuum pressure. A set of laboratory scale experiments were carr…
Pale blue, lath-shaped single crystals of K2NdP2S7 (≡ K4Nd2[PS4]2[P2S6]; monoclinic, P21/n, a = 904.76(8), b = 677.38(6), c = 1988.7(2) pm, β = 97.295(5)°, Z = 2) are obtained by the reaction of Nd, S and P2S5 with an excess of KCl as a flux in evacuated silica tubes at 750 °C (7 d) which should produce Nd[PS4] instea…
We propose a model, translated into an algorithm, to simulate nonisothermal sintering of polydispersed glass undergoing concurrent crystallisation. The model is based on the two classical sintering stages proposed by Frenkel and Mackenzie–Shuttleworth. The input parameters are green density, particle size distribution…
Among porous ceramic with unidirectionally aligned pores, synthesized from a water-based slurry using unidirectional freezing and freeze-drying process, porous silicon nitride showed a characteristic microstructure wherein the macroscopically aligned open pores contained many fibrous grains protruding from their inter…
Combinations of different yarn components are useful for improving yarn structure and properties. In this research, we describe a new method of combining filament yarns and staple fibers on a modified open-end rotor spinning frame. By changing filament over-feed, we have produced three kinds of hybrid yarns while keep…
A waveguide can be self-written by a beam of light propagating in a photosensitive material. We report the first observation of self-writing effects in bulk chalcogenide glass and investigate the influences of different writing beam sizes and powers. We observe increases in refractive index of 2.5/spl times/10/sup -4/…
Optical diffraction has been demonstrated to be a useful method with which to noninvasively examine materials and structures that result from lithographic processes used in the semiconductor indus- try to create integrated circuits. The process of inferring the geometry of the lithographically created structures from…
A surface-structure study of human tooth enamel crystals has been carried out by high-resolution electron microscopy (HREM). The surfaces of several crystals have been examined and the surfaces of a single crystal are described here. The observations made on this crystal are similar to the observations made on the oth…
A first-principles-derived approach is used to study structural, piezoelectric and dielectric properties of Pb(Zr 1 m x Ti x )O 3 (PZT) solid solutions near the morphotropic phase boundary at low temperature. Three ferroelectric phases are found to exist: a tetragonal phase for larger x compositions, a rhombohedral ph…
The dynamic rheological behaviour of gamma-irradiated 12.8 wt% poly(vinyl alcohol) (PVA), 12.8 wt% poly(vinyl pyrrolidone) (PVP), and a blend of 8 wt% PVA and 4.8 wt% PVP aqueous solutions have been studied pre- and post-gelation. The non-irradiated solutions displayed rheological behaviour typical of dilute to semi-d…
A decoction of leaves and stems of Anisomeles indica (Lamiaceae) is claimed to possess anti-inflammatory activity in Sri Lankan traditional medicine. The plants at both preflowering and flowering stages are used as an anti-inflammatory agent. However, the anti-inflammatory activity of the plant has not been scientific…
Optical scatterometry by use of a neural network is now recognized as an efficient method for retrieving dimensions of gratings in semiconductors or glasses. For an on-line control, a small number of measurements and a rapid data treatment are needed. We demonstrate that these requirements can be met by combining data…
PET fabric/polypyrrole composites with high electrical conductivity were prepared by polymerization of polypyrrole on a PET fabric through both chemical and electrochemical oxidation of pyrrole monomer. We investigated environmental stability of the composite and measured activation energy using the Arrhenius Equation.
The influence of trace amounts of transition metals (Cr, Mn, Fe, Co) on the structural and catalytic properties of silica and 1 wt% titania–silica nanoparticles prepared by flame synthesis has been investigated. The transition metal concentration was varied from 40 to about 2000 ppm by admixing the corresponding trans…
The study on thermal energy transport system by synthesis and decomposition reactions of methanol was reviewed. To promote energy conservation and global environment protection, a two-step liquid-phase methanol synthesis process, which starts with carbonylation of methanol to methyl formate, then followed by the hydro…
In this paper, we develop a fully automatic mesh filtering method that adaptively smoothes a noisy mesh and preserves sharp features and features consisting of only few triangle strips. In addition, it outperforms other conventional smoothing methods in terms of accuracy.