Materials Literature
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Polycrystalline α-alumina matrix composite fiber dispersed with YAG (yttrium-aluminum garnet, Al5Y3O12) particles have been prepared by sol-gel process using α-alumina fine seed particles. The α-alumina seed particles accelerated the crystallization of alumina matrix from θ to α phase resulting in composite fibers wit…
The contribution of the unique magneto-optical structure with the MnSb and MMnSb (M=Au, Pd) phases to the magneto-optical spectra of the composites films with various MnSb-MMnSb volume fraction was discussed in connection with the dielectric tensor analysis. As results, it was found; (1) The Mn-Sb-M (M=Au, Pd) films a…
Starting from aluminium rod stock and dopant salts, hydrothermal synthesis of pure and doped alumina powders in the temperature range of 300°-550°C and pressure range of 20–150 MPa is described.
The embedded atom method (EAM), where a highly accurate empirical inter-atomic potential calculation is possible in comparison with the two-body pair potential, is used for the molecular dynamics (MD) simulation. Parameters are fitted for Al and Cu so as to reproduce the metal properties such as elastic constants (C11…
When an alternating current flows through a ferromagnetic wire, its thermal output is higher than predicted by the familiar Joule law. An additional contribution arises from the heat liberated due to the hysteresis loss in the self-induced magnetic field inside the wire. Simple calculations, based on the formulae deri…
In order to conserve the energy resources and to reduce the dependence to oil, the large coal fired power plant which was improved heat efficiency has been currently developed. A very effective method of improving the heat efficiency of steam power plant is the raise of steam conditions. It is important to develop the…
Our recent calorimetric studies on glass transition, especially for high pressure experiments, are reviewed in this article. The materials examined are molecular liquids with relatively simple molecular structure. The content of the article is as follows. (1) Introduction (2) Adiabatic Calorimeter under High Pressure…
Unlike the determination of skin roughness, the determination of skin gloss has as yet been given little attention. Recent books on examination techniques for human skin contain nothing on this subject [1–4]. This maybe connected with the fact that no methods exist for an objective assessment of skin gloss. Gloss meas…
Simultaneous synthesis and densification of α-Zr (N) (hexagonal) from zirconium powder compacts are achieved by self-propagating combustion under high nitrogen pressures. Nitrogen contents increase from 12.2 to 23.5 at% with decreasing compacting pressure and increasing nitrogen pressure. The material with the highest…
This paper considers the efficiency of electrostatic charging of water-sprayed fibers during the melt-blowing process. Two charging methods were used to charge the fibers near the die exit and the fabrics after the collector. Both showed that the charging efficiency was not affected by the water-spraying process if th…
Sheets from blends containing liquid crystalline polymer (LCP) and bisphenol-A polycarbonate (PC) were prepared using a twin screw extruder at various take-up speeds. Thermal behavior, mechanical properties, and viscoelastic properties of sheets with various compositions were investigated using differential scanning c…
Catalytic effect of metal ions: Cr(VI), Cr(III), Cd(II), V(V) and chloride anion, on the oxidation of S(IV) in aqueous solution, at concentrations of metal ions and S(IV) usually found in urban atmospheres, were studied under controlled experimental conditions (pH (2.1 - 4,5), T (25.0 - 35.0 °C), air flow rate, concen…
The development of a practical solid oxide fuel cell (SOFC) requires an improvement in cell performance and a manufacturing technology suitable for mass production. In particular, tubular type SOFC is thought to be superior in its reliability because the configuration avoids high temperature sealing and reduces the th…
The kinetics of phase separation in 15Na2O⋅85B2O3 binary glass was investigated using 11B nuclear-magnetic-resonance (NMR) spectra together with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results showed that the product of sodium-rich phase after heat-treated at 500°C was not Na2O…
The Nuclear Safety Commission (NSC) derived the unconditional clearance levels for concrete and metal arising from the operation and dismantling of nuclear reactors. The Japan Atomic Energy Research Institute conducted technical analyses to support the discussion by NSC. The clearance levels of 20 radionuclides were d…
Corrosion behaviours of mild steel were investigated by measurement of corrosion loss and stress corrosion cracking tests in methanol and its solutons containing formic acid. In methanol solution containing 0.5% formic acid, corrosion rate was maximum at the composition of approximately 98% methanol with 2% water and…
Ring-opening insertion polymerization of ε-caprolactone is retarded in dimethylformamide when catalysts such as dibutyl tin oxide, zinc acetate and titanium tetrabutoxide are employed.
The reaction of certain phenyl nitronyl nitroxide derivatives with strong acceptors such as TCNQF4 or TCNQ in appropriate solvents give the corresponding imine nitroxide derivatives by an anomalous deoxygenation reaction with acceptors in a selective manner.
Surface enhanced Raman scattering studies are carried out for 1,4-diaminoanthraquinone dye [1,4-DAAQ] in Ag colloid in order to understand the enhancement effect and the nature of interaction between the dye molecule and Ag surface. Detailed analysis of the enhanced vibrational bands in the SERS spectrum shows that th…
Workhardable materials like high speed tool steels and super alloys have low ductility and narrow range of temperature suitable for rolling. In the hot profiled rolling of these materials, prevention of cracking in roughing process is significant technique. Considering the strong temperature dependence of deformabilit…