Materials Literature
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Nanocrystalline aluminum nitride powders obtained from gas condensation and in situ nitridation in a forced‐flow reactor have been sintered successfully without pressure or additives. The resulting densified pellets showed good thermal conductivity and low oxygen content. A comparison of the improvement in densificati…
PURPOSE: To determine whether combined intravenous liposomal doxorubicin and radio-frequency (RF) ablation decreases tumor growth and increases endpoint survival over those with RF or liposomal doxorubicin alone in an animal tumor model. MATERIALS AND METHODS: Subcutaneous R3230 mammary adenocarcinoma (1.1-1.4 cm) was…
Thin films of polypropylene have been irradiated with different doses of gamma radiation from a 60Co source. IR, UV-VIS spectra of this polymer before and after irradiation have been recorded and from the spectral data some modifications in the properties have been investigated. The spectra indicated that polypropylen…
Composites consisting of icosahedral (i) phase and ductile α-Mg can be fabricated by controlling the alloy composition. With increasing Mg content, the primary solidification phase changed from the i phase to the α-Mg phase and single eutectic structure can be obtained at a composition of Mg72Zn23.5Y3.5. The i phase s…
Mechanical properties of silicon carbide composites reinforced with highly crystalline fibers and fabricated by the chemical vapor infiltration method were evaluated. Materials used were SiC/SiC composites reinforced with unidirectional Hi-Nicalon Type-S fibers and unidirectional Tyranno SA fibers with various fiber/m…
Abstract An all‐solid actuator, consisting of a polyaniline (PANI) film and a solid polymer electrolyte (SPE) of poly(ethylene oxide) derivative (STO288), clearly showed a reversible displacement in an atmosphere when a voltage was applied between the PANI film and the SPE layer. The displacement and the response rate…
At neutral-grounded substations, ferroresonance may happen upon switching a circuit breaker or disconnector, due to the saturated magnetizing characteristics of the bus PT. In this paper, a systematical method is presented to analyze and suppress the phenomenon. The scheme for suppressing the ferroresonance is to inse…
A procedure for the preparation of high-quality single crystals from concentrated glyme mixtures is presented. Anhydrous single crystals of LiNO(3) and LiClO(4) were prepared in this manner, and the single-crystal structure of LiClO(4) (orthorhombic, Pnma, a = 8.6447(12) A, b = 6.8512(10) A, c = 4.8254(7) A, Z = 4) wa…
Liquid-crystal phases are typical examples of soft and complex materials that exhibit an abundance of different phenomena. In this paper we present some of our results contributing to the understanding of the physics of defects in nematic liquid crystals. The examples presented exhibit many features that are also of i…
This paper is a review of the present status of research activities on the divertor and the first wall for fusion power plants in Japan. There are several key issues as follows; 1) plasma facing materials, 2) fabrication techniques, 3) thermal hydraulics, and 4) component design. It can be said that solid surface plas…
We have fabricated a light-emitting diode on a Si(100) p+ substrate operating at room temperature close to 1.6 μm. The growth of the structure was performed by molecular beam epitaxy. The active zone of the p–i–n diode consists of 20 layers of Ge/Si self-assembled quantum dots. The growth parameters of the active zone…
Abstract Two series of segmented polyurethanes were prepared with systematic variation in soft and hard segment length. The soft segment was constituted by polycaprolactone (PCL) blocks of molecular masses 530 or 2000 and the hard segment (HS) by urethane blocks, in a concentration that varied from 12% to 44% in weigh…
Thin‐walled (wall thickness, 100–2000 μm) mono‐ and bilayered ceramic tubes in the system Si–O–C–(N) were obtained by centrifugal casting of a polysiloxane/filler suspension. Si and SiC powders were dispersed in polyorganosiloxane/triethoxysilane solutions. After centrifugal casting in a Teflon tube with a rotational…
Materials for organic photovoltaic cells and light-emitting devices are reviewed. Dye-sensitized systems represent the most studied of these materials as they offer high efficiency of photoelectric energy conversion. Systems demonstrating efficient luminescence were identified; they are based on conjugated polymers, c…
Mixing a smectite clay with some dendritic surfactants shows that despite the large size of some of these molecules, a property that frustrates complete intercalation into the gallery of the clay, organoclay materials are obtained. X-ray powder diffraction (XPD) reveals no significant increases in lattice spacing as t…
Ammonium polyphosphate (APP) shows fire retardant activity in poly(butylene terephthalate (PBT), as the LOI values increase and the UL94 rating improves. TG, FT-IR and GC/MS data provide evidence that APP interacts with PBT. Addition of APP changes the composition of the solid, high and low boiling decomposition produ…
Abstract This paper reports a method to produce networks of crystalline gallium oxide comprised of one‐dimensional (1D) nanostructures. Because of the unique arrangement of wires, these crystalline networks are termed as ‘nanowebs’. Nanowebs are of great technological interest since they contain wire densities of the…
An ionized physical vapor deposition, negative sputter ion beam (NSIB) technology, is described for the deposition of super-smooth indium–tin oxide (ITO) thin films with highly transparent and conductive properties at near-room temperature deposition. A negatively charged sputter ion beam is produced by retrofitting a…
Trivalent Pu can be incorporated in the silicate apatite structure to form Ca 2 Pu 8 (SiO 4 ) 6 O 2 by sintering under reducing conditions, while the incorporation of tetravalent Pu in the Ca/rare earth sites in oxidizing or neutral conditions is limited to only 0.6 formula units (f.u.). The d ‐spacings and intensitie…
Abstract Previous work has shown that prebreakdown, electrical aging, and breakdown phenomena are directly associated with charge carriers injected from electrical contacts and their subsequent dissociative trapping and recombination. In addition, the energy released from each trapping or recombination event is dissip…