Materials Literature
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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…
The ultrasonic measurement technique was proven to be an accurate, reproducible, fast, and easy to use technique for the determination of crystal growth kinetics. Desupersaturation curves of various solutions of inorganic and organic substances, e.g., copper sulphate pentahydrate (CuSO 4 · 5 H 2 O) and potash alum (KA…
The photoluminescence properties of mercaptocarboxylic acid-stabilized CdSe nanoparticles were modified by coating with polyelectrolyte. With a concentration of the positively charged polyelectrolyte poly(diallydimethyl-ammonium chloride) (PDDA) of 0.45 and 1.14 g l −1 , the intrinsic emission of CdSe nanoparticles wa…
Yams production from recycled fibers (RF) is limited, and spinners often prefer to produce coarse yams from these fibers. In this research, we attempt to produce middle- count twp-component and three-component yams from RF in such a way that the RF in the yarn core are completely covered by virgin cotton fibers. To im…
Polarization switching and retention of each of the two polarized states in Langmuir—Blodgett (LB) ferroelectric films are studied using nonlinear dielectric spectroscopy. It is found that polarized states can be preserved for a long time, but the polarization dynamics in 10–40-nm-thick LB films is characterized by a…
Silicon dioxide thin films with variable and controlled porosity have been prepared at room temperature by plasma enhanced chemical vapor deposition in an electron cyclotron resonance microwave reactor with a downstream configuration. The procedure consists of the deposition of successive cycles consisting of a sacrif…
The aqueous dissolution of irradiated and unirradiated uranium-thorium dioxide, (U,Th)O2, fuel pellets in Yucca Mountain well water has been investigated. Whole and crushed pellets were reacted at 25 and 90°C for periods of up to 195 days. The fuel dissolution was measured by analyzing the concentrations of soluble ur…
The influence of age hardening temperature and time on the hardness, tensile properties, electrical conductivity, and microstructure of Cu – 4Ti – 0.1Zr and Cu – 3Ti – 0.1Zr alloys has been investigated. The resulting microstructure of these alloys suggests that zirconium addition prohibited the formation of compositi…
The absorption spectra, temperature dependence of light transmission, and dc resistivity of ${\mathrm{La}}_{0.92}{\mathrm{Ca}}_{0.08}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystal are investigated. The volume of the metallic phase in insulating matrix is evaluated by analyzing the temperature dependence of the light abso…