Materials Literature
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From MnZn ferrite ("6H20" of FDK production), cores having grain size of about 8/spl sim/10 /spl mu/m were produced by controlling the calcination temperature, after-calcination milling time, and sintering conditions. The ferrite powder production conditions and core microstructure were examined to determine their eff…
Abstract Previous research work in our laboratory has indicated that the efficiency of certain flame‐retardant fibres can be further enhanced if certain interactive intumescents are dispersed on their surfaces. In our previously reported work we have successfully observed interactions between certain commercially avai…
Beryllium oxide crystals are studied by time-resolved optical and luminescence vacuum-UV spectroscopy. The low-temperature luminescence spectra and the luminescence decay kinetics (2.5–10 eV, 1–500 ns) upon selective photoexcitation, and also the luminescence excitation and reflectivity spectra (8–35 eV), are analyzed…
Self-passivated copper as a gate electrode in the form of TiO/Cu/TiO/TiN/SiO2 has been obtained by annealing Cu/Ti/TiN/SiO2. The thickness of Ti in Cu/TiTiN was optimized at 150 Å by forming an 80 Å continuous TiO film on the outer surface of the Cu. The multilayer of SiO2/TiO/Cu/TiO/TiN/SiO2 showed stable electrical…
Improvements in the optical switching properties of electrochromic nickel hydroxide/nickel/glass thin film are reported. Nickel metal film was deposited on glass by e-beam evaporation prior to following electrochemical redox cycling to form nickel hydroxide for electrochromic activation. In the absence of the indium t…
The reaction of Eu(tta) 3 (tta = thenoyltrifluoroacetonato) with 4,4'-bipyridine (bipy), trans-1,2-bis(4-pyridyl)ethylene (bipyete), and 4,4'-bipyridine-N,N'- dioxide (bipyo) yielded three distinct complexes [Eu(tta) 3 (bipy)(H 2 O)] (1), [Eu(tta) 3 (bipyete)(CH 3 OH)]·CH 3 OH·bipyete (2), and [Eu(tta) 3 (bipyo)]·CH 3…
X-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and x-ray absorption spectroscopy (XAS) techniques have been applied to characterize the surface composition and structure of a series of CuO–TiO2–CeO2 catalysts. For a small loading of cerium, ceria was mainly dispersed on the titania surface and a mino…
Abstract Blends of two or more polymers having appropriate reactive groups can be crosslinked through condensation or substitution reactions in the absence of crosslinking chemicals when molded at high temperatures for prolonged times. When at least one of the two polymers is a rubber, such blends are called “self-cro…
The temperature dependence of the coercivity of Sm-Co based magnets is investigated by magnetization measurements and model calculations. The Zr-free titanium-substituted Sm-Co material exhibits a positive temperature coefficient dH/sub c//dT of the coercivity (TCC) above room temperature, a reasonable hysteresis-loop…
The temperature dependence of coercivity in Sm(Co/sub bal/Fe/sub 0.1/Cu/sub y/Zr/sub 0.04/)/sub 7.0/ magnets with y=0 to 0.20 has been systematically studied. Two models are discussed with respect to the temperature dependence of coercivity. One model considers only domain wall (DW) pinning and explains the "abnormal"…
Abstract The model system Me/(100) SrTiO 3 (Me: Pd, Pt, Cu, Ni, Cr, Mo, Nb, and Al) was used to show that there exists a simple correlation between the formation of particular epitaxial orientations, the lattice mismatch between metal and SrTiO 3 , and the oxygen affinity of the metal. The growth of the metal films on…
In order to study the compatibility promoted in polyamide 6 (PA6) and ultra low-density polyethylene (ULDPE) blends by grafting polar groups into the ULDPE, several blend compositions were prepared in a twin screw extruder. The grafting agent was diethylmaleate (DEM), and the blend compositions prepared were 0, 20, 50…
Metal bonded cobalt ferrite composites are candidate materials for torque sensor applications because of their high magnetostriction /spl lambda/ and particularly the high value of the derivative d/spl lambda//dH. This paper reports on recent investigations of the magnetomechanical effect under torsional stress in (Co…
Abstract A study on the apparent thermal conductivity of polyurethane foam was carried out. A HCFC (hydrochlorofluorocarbon) gas and carbon dioxide were used as the physical blowing agent and ultrasonic excitation was applied to increase the rate of bubble nucleation. The thermal conductivity of the binary gas mixture…
Abstract An Erratum has been published for this article in Polymers for Advanced Technologies 12(10)2001, 603. Poly(diorganylsilylene)s can be excited within the framework of Si bonds in the polymer backbone as well as within a side group skeleton. An electron transfer from the main chain to a side group or an interch…
Conformation of fabrics to complex molds during composite processing induces significant fabric deformation and local shear, which in turn alter the processability of these preforms from their unsheared, flat configuration. The present work (Parts I and II) establishes that although composite mold processing can often…
Smart electromechanical systems consist mainly of sensors, actuators, and data processing units. Actuators are the responding units of many smart systems including those for active vibration control and noise control. Increased demand for actuators with high-displacement, high generative force, and quick-response time…
A new calculational scheme has been developed for the accurate assessment of gamma heating in fast reactors, its special feature being the determination of the gamma source distribution that is formulated in a near-to-exact manner. The improved methodology, which has been implemented into the ERANOS (European Reactor…
Four diads consisting of a free-base or zinc aryl-porphyrin associated with two ruthenium(II) bis(terdentate) complexes (non-cyclometallated Ru ( N 6) or cylometallated Ru ( N 5 C )) have been synthesized. The strong electron-withdrawing properties of the Ru ( N 6) as compared to the Ru ( N 5 C ) complex have been ill…
Impact ionization process in diamond under extremely high electric fields (EFs) has been investigated. The impact-ionization rate was calculated theoretically from Fermi's golden rule using the full band structure. It is found from Monte Carlo simulations that the impact ionization of carriers occurs at high EFs above…