Materials Literature
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Surface-enhanced Raman scattering from a layer of organic molecules adsorbed on aluminum oxide and covered by a controlled-roughness silver film has been studied. The molecule-silver distance dependence of the Raman-scattering enhancement by the surface was measured in four separate experiments. Large enhancements (\e…
Temperature dependences of multiphonon relaxation rates for 4F3/2 states in Nd3+-glasses were determined by measuring fluorescence intensity and lifetime in the range of 300-600 K. According to the theory of multiphonon relaxation and vibrational spectrum we made a theoretical fitting of curves. Multiphonone processes…
Molybdenum has received considerable attention as engineering materials for heat engine applications. In this study, the possibilities and conditions for winning the pure molybdenum by the carbothermic reduction of MoO2 in vacuum have been examined with regard to the following items: (1) Working conditions and analyti…
The singl crystals of potassium hexa-titanate were synthesized by melt reacting TiO2 and K2CO3, from which lattice parameters, indexes of X-ray powder diffraction data and infrared spectra were obtained.The crystal system of potassium hexa-titanate was monoclinic. The space group was C*/* (C2, Cm, C2/m) and the cell d…
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Cold-worked copper and α-brass, which have wavy and planar slip modes, respectively, were low cycle fatigued, and the relation between the fatigue life and the cyclic softening behavior was discussed in terms of the slip mode. The amount of cyclic softening is much larger in copper than in α-brass, and the fracture du…
In order to clarify the mechanism of formation of negative segregation zone, an experimental study has been done on uni-directional solidification of iron with carbon contents of 0.09 to 0.25% and the solidification rate of about 6mm/min. Melting and solidification of iron were done in crucibles with an abrupt change…
New adducts of phthalocyaninatocobalt(II) with piperidine, 1-methylimidazole, 3,4-dimethylpyridine, 3,5-dimethylpyridine, 4-methylpyridine, 3-choloropyridine, pyrazine, 3-ethylpyridine, 4-ethylpyridine, 3-acetylpyridine, and 4-acetylpyridine have been synthesized. Strong σ-donor bases form bis adducts, while low σ abi…
The effect of the carbon content of a steel on its dissolution rate in HNO3 is determined by measuring the temperature rise during dissolution. Steel dissolves in dilute HNO3 to an extent which increases with the increase of the acid concentration according to an autocatalytic mechanism. In concentrated HNO3 solutions…
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A B2. type Fe-40 at % Al ordered alloy was irradiated at 20 K either with fission neutrons or 2.5 MeV electrons. During isochronal annealing experiments of the radiation induced resistivity a different behavior was observed for the two irradiations. A decrease below pre-irradiated resistivity occurs after electron irr…
Abstract The specific resistance‐thickness of ScH x (vacuum 10 −5 to 5 · 10 −6 Torr) and Sc films (vacuum 1 · 10 −8 to 3 · 10 −8 Torr) relationships have been obtained by keeping a record of a film resistance directly in the course of condensation. The results are discussed according to the theory F UCHS ‐S ONDHEIMER…
The Cu-Pd-Ag dental base alloy of higher Ag contents which contains 15.8 at%Ag was aged isothermally at various temperatures between 573 and 773 K after quenching from the solid solution temperature into iced water. In order to investigate ageing characteristics of the alloy, hardness tests, electrical resistivity mea…
コンクリートの凍結融解試験方法の動向について述べている。本試験方法のJIS原案は, 日本の試験装置の現状を考慮してASTM C 666とほぼ同様の方法をとってはいるが, 細部については同一のデータが得られるように改められた。また参考試験として, 凍結融解後の長さ変化の測定が取り入れられている。
An antioxidant commonly present in black rubber, N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD) caused very rapid oxidation and denaturation of purified hemoglobin. In the red cells, the reaction resulted in the formation of Heinz bodies, a decrease in reduced glutathione concentration, and stimulation of the hexose…
This paper reviews the corrosion problems of copper tube experienced in fresh water service. Following three distinct types of corrosion are discussed; (1) dissolution of copper, (2) pitting corrosion, and (3) erosion corrosion.Dissolved copper ion, which may cause green stains by forming insoluble cupric soap or acce…
Abstract Cerium Sulfate octohydrate crystals were crystallized from aqueous solutions under controlled conditions. The solubility measurements were carried out on temperatures between 10 and 80°. Thermoanalytical methods were applied for the study of the thermal behaviour of this compound. Raman spectra of polycrystal…
We report the results and interpretation of precision measurements of the thermal conductivity, electrical resistivity, and thermopower of potassium made from just below the melting temperature, 335.5 K, to 700 K. It is found that the Lorenz function is approximately 10% below the Sommerfeld value in the solid state,…
The damage of nickel-base heat resistant alloys exposed to hydrogen at high temperature and pressure was investigated. Tested materials were mainly Inconel 600, Hastelloy X and nickel. Inconel 600 solution-treated exhibited embrittlement due to the occluded hydrogen. Hastelloy X solution-treated did not exhibit embrit…
The dissolution properties of hydrochloride, sulfate, and iodide salts of berberine were compared. The apparent solubility and dissolution rate of the hydrochloride salt were less than those of the sulfate salt in media resembling GI fluids with respect to pH. The common ion effect on the solubility of berberine hydro…