Materials Literature
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Postirradiation annealing tests were performed to obtain the 133Xe diffusion coefficients in uranium dioxide (UO2) and mixed thorium-uranium dioxide [(Th-U)O2] fuels. Specimens were a single-grained UO2, a polycrystalline UO2, and a polycrystalline (Th-U)O2. The (Th-U)O2 specimen was a mixture of 35% ThO2 and 65% UO2.…
Bacterial uridine monophosphate (UMP) kinases are essential enzymes encoded by pyrH genes, and conditional-lethal or other pyrH mutants were analysed with respect to structure-function relationships. A set of thermosensitive pyrH mutants from Escherichia coli was generated and studied, along with already described pyr…
Electrical steel with a Si content up to 6.5 wt% is a good soft magnetic material, because the power losses are reduced through the increased electrical resistivity of the bulk material by the presence of alloying elements like Si and Al. Nevertheless, with the increasing of the alloying elements, the concentration of…
A new mechanism of the intraband carrier relaxation in quantum dots embedded into a heterostructure at a relatively large distance from its doped elements is proposed. The relaxation process is related to the coupling between the electronic subsystem of a quantum dot and surface plasmon-phonon excitations of the doped…
The relationship between yarn structure and abrasion resistance is studied. Yarn abrasion resistant properties are measured on a Shirley abrasion tester. A new yarn structural parameter, the average surface length (average segment length of a fiber on the yarn surface), is proposed. Experimental work determines the re…
Ultrathin SiO2 layers are of importance for the semiconductor industry. One of the techniques that can be used to determine the chemical composition and thickness of this type of layers is x-ray photoelectron spectroscopy (XPS). As shown by Seah and Spencer [Surf. Interface Anal. 33, 640 (2002)], it is not trivial to…
Hemidesmus indicus root in the form of suspension in water (10 mg/ml) containing 15.5 mM NaCl, 3 mM KCl and 12 mM glucose, when injected into the ligated jejunal sac (1 ml/sac) of rat, increased the absorption of water, Na(+) and K(+) (but not glucose) from the sac. This bioactivity was present in the water extract (5…
Dramatic improvements in the selective separation and purification of NO x in exhaust gases by an electrochemical reactor have been achieved. The novel electrochemical cells for NO x decomposition were developed by nano‐scale control of penetrating pores from the catalytic electrode surface to the bottom of the cataly…
Porous polymeric materials offer a great versatility in most of the promising fields of applications. This article affords a critically selected overview of the recent synthetic strategies developed to design porous polymers and their potential applications in emerging areas of science and technology, such as analytic…
The thermal, mechanical, and chemical behavior of both thorium and uranium dioxide (ThO2-UO2) and thorium and plutonium dioxide (ThO2-PuO2)-based fuels during in-service and hypothetical accident conditions in light water reactors (LWRs) is described. These fuels offer the possibility for increased proliferation resis…
Ceramic nuclear fuel fabrication is an important step in the production of cheap nuclear power. Sol-gel processes are used to produce ceramic fuel in the form of microspheres of controlled size and properties. This paper describes a complete flow sheet of internal gelation process, one of the prominent sol-gel routes…
Vertical fissures (sandcracks) affect approximately 20% of adult beef cattle in western Canada. The risk factors associated with the formation of these lesions are not well understood. This paper describes a case-control study that identifies the role of increased claw size (claw volume > 390 cm3, odds ratio 7.8) in t…
Abstract Seeking a solution to the problem of disposing scrap tires, we attempted to depolymerize or degrade vulcanized rubber scrap such that the resulting pseudo‐liquid material could be used as an extender/plasticizer in virgin rubber compounds. As degraded natural rubber (DNR) and degraded styrene‐butadiene rubber…
Experiments of annealing effect of boron-doped homoepitaxial diamond film on Schottky junction properties have been conducted to investigate the origin of the “pinning” states in oxidized surface of diamond. Metals of Al, Ni, Au, and Pt are evaporated onto boron-doped diamond films with post thermal annealing less tha…
Composites of iPP with flax fibers in amounts 5 or 10 wt. %, either unmodified or modified with acetic anhydride, were obtained by extrusion. The samples were then injection molded from granulated products of composites (Table 1). Effects of temperature of extrusion head and injection mold as well as the effects of fi…
The feasibility of determining surface stress distribution in magnetic materials by magnetic measurements has been studied using a newly developed magnetic imaging system. The results indicate that magnetic measurements can be usefully used for detecting stress concentration in magnetic materials nondestructively. The…
Surface relief holograms are fabricated by irradiation of laser intensity pattern on the azo-benzene functionalized polymer films. The diffraction efficiency and the surface relief depth depend on the writing energy and the polarization of the laser beam. This structure is very stable at temperatures below the glass t…
Recent advances in electron transfer chemistry of supramolecular electron donor-acceptor assemblies – containing porphyrins and metalloporphyrins – in connection with ICPP-3 are reviewed briefly by focusing on aspects of electron and energy transfer reactions.
We have investigated the recording characteristics of the dual-layer phase-change recording media for a system that uses the blue-violet laser (wavelength of 405 nm), with the numerical aperture of 0.65 and light incidence on 0.6-mm-thick substrate having the land and groove format (HD DVD). In order to achieve higher…
The crystal structure, magnetization, and spontaneous magnetostriction of Tb/sub 1-x/Nd/sub x/(Fe/sub 0.9/B/sub 0.1/)/sub 2/ alloys have been investigated. X-ray diffraction (XRD) analysis shows that the alloys consist predominantly of the cubic Laves phase with a MgCu/sub 2/-type structure for x/spl les/0.55. Increas…