Materials Literature
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Polymeric materials are an alternative to porcelain and glass regarding outdoor HV insulators. Silicone rubber appears to be one of the main candidates to replace porcelain and glass. Although much work has already been done regarding the behavior of complete polymeric insulators in the laboratory and in the field, re…
Ways of finding kinetic parameters useful for pharmaceutical formulators from thermal analytical methods (TGA, DSC) under both isothermal and non-isothermal conditions are suggested. We considered as an example those followed to determine the first-order kinetics of dehydration of cross-linked polyvinylpyrrolidone (PV…
Abstract Current‐voltage characteristics measured on TlGaTe 2 single crystals reveal switching effects at temperatures below 263 K. The current‐voltage characteristics are symmetric with respect to the polarity of the applied field. The threshold parameters for switching are found to depend on temperature, illuminatio…
A theoretical analysis of the resistance to bending of set plain-woven fabrics is presented. It is shown that no forces will be generated at the crossover points between the warp and weft threads when a fabric is bent by an external couple. The analysis yields convenient formulae for calculating the bending parameters…
ビフェニルの液相イソプロピル化反応におけるH-モルデナイト (HM), HYおよびHL等の12員環ゼオライトの触媒挙動を検討した。プロピレンをアルキル化剤とするイソプロピル化において, HM触媒のみが高い形状選択性を示し, イソプロピルビフェニル (IPBP) に関して4-IPBPが70%以上, ジイソプロピルビフェニル (DIPB) に関しては4,4'-DIPBが80%以上に達した。4,4'-DIPBの生成は逐次反応であり, モノアルキル化では4-IPBPが形状選択的に生成し, ジアルキル化ではIPBP異性体のうち, 4-IPBPが優先的に反応し高い選択率で4,4'-DIPBが生成する。この形状選択性は, 遷移状態における立体規…
Conventional NICALON fiber has a refractoriness of only about 1200°C because of its high oxygen content. Recently a new fiber HI-NICALON with improved refractoriness has been developed. The slurry process developed by the authors was adopted for the fabrication of HI-NICALON fiber-reinforced Si3N4 composites. Carbon-c…
The effect of partial discharges in benzyltoluene upon impregnated polypropylene films has been studied in a sphere/plane electrode geometry. It is shown that discharges even with a small apparent charge (/spl sim/1 pC) cause a significant decrease of the breakdown strength of the film. The addition of an epoxy compou…
A number of the test programs currently in progress at the Halden Project are aimed at evaluating Zircaloy cladding performance in terms of corrosion behavior, particularly at high burnup. A pressurized water reactor (PWR) facility has been used to determine the effects of high (4 to 4.5 ppm) lithium on the corrosion…
The thermal behaviour of five hydroxyphosphates, lipscombite [Fe3(PO4)2(OH)2], barbosalite [Fe3(PO4)2(OH)2], giniite [Fe5(PO4)4(OH)2· 2H2O], rockbridgeite Fe5(PO4)3(OH)5] and Fe4(PO4)3(OH)3, has been studied. Thermogravimetric analysis revealed the hydroxyphosphates to have distinct behaviours: some underwent dehydrox…
Non-reactive pure metals do not wet ionocovalent oxides like alumina and silica. It is believed generally that a strong improvement of wetting can be produced by alloying elements presenting a high reactivity with the oxide substrate. In this study, existing data on contact angles are reviewed and analysed in order to…
The effects of additions of 0.1–2.0% of Co, Ni and Ti on the cellular precipitation in a Cu-2 mass%Be alloy were investigated by the quantitative metallographic method.The addition of Co, Ni and Ti hastened the start of the precipitation of γ′ phase in the matrix and increased slightly the maximum hardness. These elem…
The etching process for a Cu interconnect with self-aligned deposition of a thick sidewall film has been developed. This sidewall film acts as a barrier layer to prevent Cu from corrosion and oxidation during the subsequent process, such as formation of a passivation film. Using this etching process, the Cu interconne…
Studies on the title compound have established that, although it could be oxidised with a concomitant change in its visible spectrum, this process is not reversible. This is discussed in the light of the crystal structure which is also reported in this paper. The title compound crystallises in the monoclinic space gro…
(1994). Physical properties of liquid metals [IV] surface tension and electronic transport properties of liquid metals. Welding International: Vol. 8, No. 10, pp. 766-770.
This paper reviews recent progress in synthetic methods for aromatic polyimides in terms of conventional two-step, one-step, and three-step process where tetracarboxylic acid derivatives or diamine derivatives are used as starting materials with some emphasis on author's works.
The influence of stochasticity of external action on damage accumulation is studied in terms of CDM. The accounting for microscopic mechanisms is based on the introduction of additional parameters—traditional damage and shear damage. Kinetic equations of damage accumulation are reformulated to account for the stochast…
It is well known that Fe-Mn-Si alloy exhibits shape memory effect, when stress induced martensites disappeared above As temperature. Its one-way shape memory behavior is applied for pipe joints. From a practical application viewpoint, the process of pipe forming which includes welding of plates is introduced with the…
Thus,it is suggested that only by enhancing the stabilityof 5 phase or 3 phase in water and preventing 5 phase or 3phase from the hydrolyzing can the water resistance of MOC beimproved well.
2成分系カルシウムフェライトと4成分系カルシウムフェライトの還元挙動の違いを明らかにするための基礎的研究として,試薬を用い化学組成の異なる2種類のCaO-Fe2O3-Al2O33成分系カルシウムフェライトを合成し,そのCO-CO2混合ガスによる還元経路並びに還元平衡を調べ以下の結果を得た。(1)Al2O3含有量の多いCaO・3(FexAl1-x)2O3系の3成分系カルシウムフェライトはCaO・Al2O3を析出しながらAl2O3,CaOを固溶したマグネタイト,ウスタイトを経て鉄に還元され,4成分系カルシウムフェライトと還元経路は同じである。還元の各段階の平衡曲線は,純粋なマグネタイトとウスタイトおよび純粋なウスタイトと鉄の平衡曲線を…
Description Comprehensive look at the latest research on how radiation effects metal and non-metal materials, with emphasis on fundamental mechanisms of damage and applications to nuclear systems. Over 80 peer-review papers in 15 sections. The diversity of the selections cover a complete range of topics, including: •…