Materials Literature
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The oxidation kinetics of HF-etched n- and p-doped silicon in air at room temperature have been studied by electron spectroscopy for chemical analysis. No great differences have been found between the n- and p-type oxidation kinetics at the low doping level of the studied samples. The rate of oxide growth on the HF-et…
Electrodes can be coated with electrochemically reactive polymers in several microstructural formats called sandwich, array, bilayer, micro-, and ion-gate electrodes. These microstructures can be used to study the transport of electrons and ions through the polymers as a function of the polymer oxidation state, which…
形状記憶合金を用いたアクチュエータの応答を改善する冷却の一方式が提案された.この方式のアルミニウム製のヒートシンクを用いることによって, 形状記憶合金の冷却速度が著しく増加することが示されている.またこのアクチュエータの性能及び制御法について検討を行った.
The coordination structure of ZnII ions in HCONH2–HCOONH4–ZnO solution, where the molar ratio of HCOONH4 and ZnO is ca. 2.0, has been investigated using EXAFS (extended X-ray absorption fine structure) and RDF (radial distribution function) methods. From both results we found that ZnII ions from mononuclear Zn(HCOO)2(…
The characteristics of Ag–Al2O3 films electrodeposited from silver thiocyanate solutions containing Al2O3 particles were investigated. The following results were obtained. As the amount of added Al2O3 particles was increased, the amount of Al2O3 codeposition in the Ag electrodeposited film increased, with a subsequent…
A eutectic alloy of GaSb-CrSb has been unidirectionally solidified at various rates of solidification, in order to investigate the structural change with the solidification condition.The results are as follows:(1) The spacing λ of CrSb rods was expressed to be linear to R−1⁄2, where R was the rate of solidification, a…
It has been reported that a unique polytype transformation (6H→4H) in the sintering process of SiC ceramics with BeO addition was observed by means of analytical electron microscopy, in which α-SiC powder was used as a starting material. In this report, the sintering process of β-SiC was investigated. It was expected…
In order to obtain highly conductive glass-ceramics containing vanadium bronze, MxV2O5 (M=alkali metal, etc), which is known to have high electronic conductivity, Na2O-V2O5-P2O5 glasses were heat treated to perform crystallization. The dc conductivities of the glasses containing 60 to 77mol% V2O5, in which [Na2O]/[V2O…
Relationship between wet adhesion of paint coating film (paint film) on coated steel (wet adhesion) and stress changes in paint film has been investigated. At the same time, the creation mechanism of ZnO under paint film has been examined.Zn3(PO4)2•4H2O under paint film dehydrates to Zn3(PO4) 2•2H2O with cathodic elec…
The effects of various additives on pH and rates of setting reactions of a commercial zinc phosphate cement system were examined. While the addition of various organic materials to the cement powderproduced no effect on the pH changes, addition of both calcium oxide and calcium hydroxide to the cement powder increased…
Powders containing perovskite type double oxides of the series Pb(Mg1/3Nb2/3)O3-Pb(Zn1/3Nb2/3)O3 as a main constituent have been prepared by firing the batch mixture according to the chemical formulae. It is interesting to know the substitutional solid solubility of ZnO for MgO in this series because the latter end me…
Each of the pale yellow title compounds (1), in toluene and other appropriate organic solvents, cyclises on irradiation at 366 nm to give purple solutions containing a mixture of a thermally unstable, blue 4-substituted 1,8a-dihydro-5,8-dimethoxy-1,1-dimethylnaphthalene-2,3-dicarboxylic anhydride (5) and a thermally s…
To improve an electrical capability of aluminum electrolytic capacitor, a new electrode material of large dielectric constant and high dielectric strength. This thin film electrode of titanium rich aluminum alloy is made with a rapid quench method and has very small grain size of a few micrometers and high toughness.…
The effect of colloidal silica on the [Ru(bpy)3]2+-sensitized photochemical cis-trans isomerization of N-methyl-4-β-styrylpyridinium (cis-MSP+) ion induced by one-electron transfer has been studied. An efficient electron-relay chain reaction has been shown to take place on the colloidal surface, on the basis of remark…
Abstract Electron penetration into the sample in the scanning electron microscope can give rise to bright fringes close to sharp edges in the secondary electron image. This can make it difficult to see details close to the edge. These fringes can be considerably reduced by putting a positive control electrode (CE) bet…
Because the locally favourable structure is globally unfavourable, choles teric liquid crystals are frustrated. Near the isotopic transition, blue phases (BP) appear as compromise structures to relieve this frustration. BPI and BPII are soft, cubic crystals with giant unit cells.
The local hydrogen concentration in the heat-affected-zone where the root cracking occurred has been investigated using the finite difference method. The effect of groove and weld metal shapes on the local hydrogen concentration was basically examined. It is clear that the local hydrogen related with the cold cracking…
The corrosion of cobalt-nickel alloys at ambient temperatures is reviewed. In the aqueous phase, data for the anodic and cathodic half-cell reactions are reported, as also for free corrosion. Under most conditions, corrosion resistance increases with nickel content, although in certain circumstances, the 50–50 wt-% al…
The lattice sites occupied by carbon in B12C3 and B9C are examined in terms of their boron‐carbon nuclear dipolar couplings and chemical shielding anisotropies as revealed by 13C nuclear magnetic resonance spectroscopy. The 13C spin‐echo decays for B9C is more rapid than that of B12C3, which is interpreted as stronger…
In order to clarify the contribution of grain boundary effect on the work-hardening rate without recovery effect, h, and the recovery rate without work-hardening effect, r, these two parameters in pure aluminum single crystals have been measured and compared with those in aluminum polycrystals reported so far. The mea…