Materials Literature
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The alloy Mn‐Al‐C (magnetic τ‐phase) has a face‐centered tetragonal lattice with the superstructure L 1 0 (Shangurov, Gornostyrev, Teitel et al ., 1990). The tetragonal crystal axes c (the directions of the easy magnetization) of the grain lattices of the polycrystal permanent magnet must be preferably oriented along…
An investigation was carried out to determine the aqueous corrosion performance of the Metco 15F commercial Ni-Fe-Cr-B-Si-C alloy coating. Such coatings are frequently used in engineering applications where a combination of high wear and high corrosion resistance is required. Accordingly, the coating has sometimes bee…
オゾン破壊物質である CFCs (クロロフルオロカーボン類)の分解処理技術の開発が急務となっている。触媒を用いた分解プロセスは,高活性,高寿命の触媒が見いだせれば,他の方法に比べ低い温度で処理することができるため,実用的なプロセスとなりうる。そこで,本研究では CFC113(C2Cl3F3)を用いて水蒸気による分解触媒の探索を行った。その結果, TiO2 触媒が高活性を示した。しかし,反応時間わずか 2 時間で活性低下が見られた。TiO2 に他の酸化物(WO3,zrO2,Nb2O5)を添加すると,WO3を混合した TiO2-WO3 触媒が高活性を維持した。TiO2系触媒の酸強度分布測定の結果,TiO2-W03触媒は TiO2 単独…
By using a needle-plane electrode system, electrical treeing discharges were measured with a computer-aided partial-discharge measurement system. It was found that time derivative of applied voltage (dv/dt) plays an important role in determining the occurrence of partial discharge (PD), while PD intensity is strongly…
In this paper, the system of detecting corona discharges automatically with an artificial neural network is examined and a network which can distinguish between corona and noise patterns occurring in power cables is investigated. A feed-forward type of a neural network with three layers, i.e., input, hidden, and outpu…
Slip casting of high-purity mullite powder produced by coprecipitation method was studied to fabricate mullite engineering ceramic parts with complicated shapes. The characteristics of the slurries were examined by zeta-potential and viscosity measurements. The preparation conditions of well-dispersed slurries were de…
Reactive ion beam etching of diamond chips with oxygen ions using a Kaufman-type ion source has been investigated. Instability of thermionic emission and short life span of the thermionic tungsten filament (cathode) in a Kaufman-type ion source become problems, because the thermionic filament is attacked by the reacti…
In anodization of alminum, electrolyte anions are incorporated into the oxide film from the liquid electrolyte. The anion distribution is related to physical and chemical properties and the mode of film formation. Prompt Gamma-ray Analysis (PGA) has higt sensitivity (2000cps·mg-1) and a low detection limit (0.002μg) f…
Laser surface alloying of duplex 2205 stainless steel with prep laced ruthenium powder has been investigated. The microstructure and corrosion behaviour of the laser surface alloyed layers were examined by scanning electron microscopy, energy dispersive X-ray spectrometry, microhardness, and open circuit corrosion pot…
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Glass formation, structure of glass and some basic and topical properties have been reviewed for gallium oxide based systems which are free from conventional glass-forming oxides. Glass-forming tendency is unexpectedly large for Ga2O3 based systems. In binary and ternary systems, it is especially large for heavier met…
The microstructure and chemical state of Zn-Co-Cr-Al2O3 composite coating before and after the cyclic corrosion test (CCT) were investigated by electron microscope, X-ray photoelectron spectrometer, and electron probe micro analyzer. The coating layer consisted of a Zn matrix containing super-saturated Co and disperse…
The physicochemical properties of the enantiomer and racemates of suplatast tosilate (ST) were investigated by means of infrared spectroscopy, solid-state 13C CP/MAS NMR spectroscopy, thermal analysis, and X-ray diffraction analysis, and by measuring the solubility and hygroscopy. The infrared and NMR spectra and X-ra…
In order to clarify the activated slip systems of β-silicon nitride (Si3N4) during high temperature deformation, we have studied the dislocation structures in hot-pressed β-Si3N4 deformed at temperatures from 1820 to 2020 K with strain rates from 9×10−6 to 2×10−4 s−1.Analysis of the dislocations by transmission electr…
The critical cooling rate for 30Na2O⋅10MgO⋅60SiO2 glass, which exhibits low Rayleigh scattering, was evaluated based on viscosity. To this end, the viscosity and thermal expansion coefficient of this glass were measured using a thermomechanical analyzer. The beam bending and parallel plate methods were effective in me…
Four new molecular-based magnets have been synthesized, and their magnetic properties have been investigated in detail. Their formulae are [M′(C5Me5)2]2M2[Cu(opba)]3·(DMSO)x(H2O)y with M′= Fe, M = Mn, x = 5, y = 4 (1), M′= Fe, M = Co, x = 6, y = 4 (2), M′= Co, M = Mn, x = 5.5, y = 4 (3) and M′= Co, M = Co, x = 5.5, y…
Article Influence of Calcium Phosphates on the Degradation of Poly Lactic Acid for Medical Implants was published on January 1, 1996 in the journal Biomedical Engineering / Biomedizinische Technik (volume 41, issue s1).
The effect of the tin addition on the primary recrystallization of Fe-3%Si containing no inhibitor was investigated. The tin addition increased the product of ND pole densities {110} and {111}. This effect is considered to be favorable for the secondary recrystallization of the silicon steel with such handicaps as hig…
The chemical interaction between plasma-excited nitrogen and the HY (decationated Y-type zeolite) surface has been studied by IR spectroscopy, XPS and temperature-programmed desorption (TPD). When the plasma-excited nitrogen was exposed to the HY sample at room temperature, the decrease in the intensities of the OH ba…
Nitrodisplacement reactions between all ten dihydroxynaphthalenes and 4-nitrophthalodinitrile have been studied. Apart from 1,8-dihydroxynaphthalene, all dihydroxynaphthalenes undergo nitrodisplacement but only 1,5-, 2,3-, 2,6- and 2,7-dihydroxynaphthalenes give high yields of pure bis(ether dinitrile). The bisfether…