Materials Literature
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メタリン酸塩ガラスの密度, 弾性率, 硬度, 熱膨張係数を測定した. 平均モル容と修飾陽イオンの半径の3乗 (アルカリ金属では, 陽イオシ半径の3乗の3倍) の間には2組の直線関係が成立した. それらは, それぞれノーマルタイプ (Ca, Sr, Ba, Li, Na) 及びアノーマラスタイプ (Mg, Zn) のガラスに対応する. これらの直線の比較よりアノーマラスタイプはノーマルタイプより空げきの多い構造であると推測される. 各種弾性率の対数と平均原子容の対数の間には3組の直線関係が成立した. それらは, それぞれLi, Naグループ, Ca, Sr, Baグループ及びアノーマラスタイプのグループに対応する. 硬度と陽イオンー…
In search of new organic nonlinear optic crystals, aromatic compounds with donor and acceptor substituents are extensively studied. Some new crystals with large nonlinear coefficient have been reported. This kind of crystals is usually not useful in ultraviolet region, because the distance between energy levels in con…
Abstract This paper is a review of our experimental research on the influence of the supersaturation, flow velocity and temperature on the linear crystallization rate of different faces of model crystal systems. The obtained experimental results are discussed in the light of the new theoretical treatments on crystal g…
Abstract Pyridoxal 5′-phosphate-α-amino acid–Zn(II) complexes and their salicylaldehyde analogues showed photochromic behavior in borate buffer at pH 9.5. A detailed comparison of UV spectral changes during the thermal back reaction with those for the complex formation indicates that the photoexcitation of the complex…
X-ray induced photoconductivity measurements reveal that the radiation-induced conductivity of polyethylene terepthalate films is greatly reduced by doping this polymer with 2,4,6-trinitrofluorenone which acts as a deep trap for the photocarriers. The radiation-induced conductivity of this doped dielectric is reduced…
The penetration behavior of Cs was studied in the oxide layer growing on SUS-316 stainless steel for a cladding material of fast breeder reactors under the condition of an oxygen potential controlled by a Ni/NiO oxygen buffer in the temperature range of 600–750°C, using radioactive 134Cs as a tracer. Two different kin…
SUMMARYMorphological, anatomical and ultrastructural differences have been observed in fronds of two months old cultures of Lemna minor L. These fronds are reduced in area and in thickness and never form colonies. They have been compared with normal and ABA treated fronds in order to determine if the above mentioned d…
Variation of salt or silica solubility as a function of water activity, capillarity pressure or pore size, is discussed as a probable origine of matter migration, concentration, and finally concretioning.
Four clinopyroxenes in the join CaScAlSiO6 -CaTiAl2O6 are synthesized at 1 atm. Deconvolution of Raman spectra of the clinopyroxenes indicates that the chains in the CaScAlSiO6 pyroxene are composed of Si-O-Si, Si-O-Al, and Al-O-Al bonds and the aluminum avoidance rule is violated. The weakness of the Si-O-Si stretchi…
The activity of Ru/TiO2 catalysts for n-butane hydrogenolysis is greatly increased by oxidation at 433 K after reduction at 758 or 893 K; strong metal–support interaction is then easily effected by a second reduction at these temperatures.
Abstract The use of surfactants offers an interesting possibility to control the crystallization from solutions. There are already some applications in technical scale. Yet, little knowledge exists on the mechanism of the effect and his dependence on surfactant concentration. Therefore, the displacement rates of selec…
The predictability of the National Defense Research Council (NDRC) equations to estimate penetration depth in concrete structures has been reevaluated using the presently available test results on missiles similar to those expected in a nuclear power plant. This study confirms the industry notion that the NDRC equatio…
The equilibrium state of polyethylene melt was studied by examining the effects of Tmelt and tmelt on the long period of B melt melt quenched polyethylene. The long period was found to be proportional to M−½ and to depend on Tmelt with a temperature coefficient α = −0.5 × 10−3. When the melt temperature was changed fr…
The available data on the reactions of Zircaloys, stainless steels, uranium metal and uranium dioxide with steam at temperatures above about 1000/sup 0/C and the reactions of core melts during concrete penetration have been reviewed and assessed for the IDCOR Program. The uranium metal is included because small quanti…
The efficiency of zinc gluconate (ZnGl) as an inhibitor of the corrosion of copper and zinc in natural sea water was studied by means of weight loss tests, potentiostatic polarisation and X-ray diffractometry.It was shown that, in naturally aerated conditions, up to 60% inhibition of copper corrosion is achieved with…
Samples of Nd doped LiYF4 single crystals (scheelite structure) were X-irradiated at room temperature and valence changes plus defect production by radiation damage were studied by optical spectroscopy techniques. The band centered at 3.70 eV showed a temperature dependent gaussian shape indicating a strong electron p…
塩化カルシウムとシリカ, アルミナおよび酸化チタンなどの酸性固体の混合物の分解反応を1気圧, 873K～1143Kの温度範囲で検討した. 塩化カルシウムはその融点以下で酸性固体に溶解し, 水蒸気中では塩化水素ガスを, 酸素気流中では塩素ガスを生成した. この分解速度は塩化カルシウムおよびシリカの濃度の1次, 水蒸気, 酸素の0.5次に比例し, 活性化エネルギーは, 塩化水素ガス生成の場合には89.0kJ/mol, 塩素ガス生成の場合には70.2kJ/molである.この塩化カルシウムの分解に対するシリカの作用は他のアルカリおよびアルカリ土類金属塩化物, 炭酸物および硫酸物に対しても同一である.
The friction-induced ignition of structural materials in oxygen has been investigated. A test arrangement has been designed that allows basic data for the oxidation reaction rate to be determined for various materials or pairs of materials. The rate at which oxidation energy is released at the rubbing interface is obt…
WATANABE (1982) developed an equation to obtain the river pollution index (RPIB) by which he tried to assess the general state of river pollution. This equation is based upon the water quality chart obtained from biological assessment. The water quality chart, however, only indicates the distribution of area with diff…
Abstract The decay of free radicals produced in polybutadiene, polystyrene, and block copolymers of butadiene and styrene by γ irradiation at 77 K has been studied at −110°C in the case of polybutadiene and at −95°C for the other samples. The free‐radical decay rate is best interpreted in terms of an equation based on…