Materials Literature
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Stacking fault energy γSF of fcc metals can be evaluated by knowing the twinning stress τT. In pure nickel, however, deformation twinning does not occur even at 4.2 K because of its high γSF. For this reason, measurements of τT for nickel-based alloys being subject to deformation twinning have been made, in order to e…
TiO2のアナターゼ-ルチル転移がSiO2によって著しく抑制されることを見出した. そこで, 転移抑制に対するSiO2の添加量や粒径, 混合状態の影響を調べ, 転移抑制機構を考察した.TiCl4-SiCl4-O2系気相反応によって合成したCVD-TiO2・SiO2粉体におけるTiO2の転移速度は, SiO2がTiO2粒子をち密に厚く覆った粒子形態のものほど小さい. 製造履歴の異なる各種のTiO2とSiO2の機械的混合物においても, 同様なSiO2によるTiO2の転移抑制効果がみられ, その効果は, 微小で分散性のよいSiO2粉体ほど大きい. 加熱処理後の試料では, 転移量と粒成長や焼結の程度との間に相関がみられた.アナターゼ-ルチ…
A tiling of the plane by closed topological disks of <italic>isogonal</italic> if its symmetries act transitively on the vertices of the tiling. Two isogonal tilings are of the same <italic>type</italic> provided the symmetries of the tiling relate in the same way every vertex in each to its set of neighbors. Isogonal…
Domain structures were observed in polycrystalline, high permeability grain oriented 3-percent Si-Fe before and after formation of a forsterite coating. A 200 kV scanning electron microscope was used for domain observations. Significant alterations in the supplementary (flux closure) domain structure and a substantial…
In an attempt to develop an improved extractant for the soil test evaluation of plant available nutrients the influence of fluoride, sulfate and acidity on extractable P and Ca was investigated with 12 taxonomically different soils, (sequentially fractionated for Ca, Al, and Fe forms of phosphorus). The soils were ext…
Description The symposium on Toughness and Fracture Behavior of Titanium was presented at May Committee Week of the American Society for Testing and Materials held in Toronto, Ontario, Canada, 1–6 May 1977. Committee J01 on Effect of Temperature on the Properties of Metals, which is a joint committee of the American S…
The recovery of defects in partially and well annealed tungsten has been studied using electrical resistivity technique. The irradiation was carried out at reactor ambient temperature (∼343 K) to a fluence of 1022 n/m2. Isochronal annealing studies of the defects show two stages centred around 0.17Tm and 0.31Tm referr…
The crystal structure of ktenasite from Miniera Trentin (space group P 2 1 / c , a = 5.589, b = 6.166, c = 23.751 Å, β = 95.55°) was determined by Patterson and Fourier methods and refined to a final R value of 0.058. The structure is characterized by corrugated sheets ∞ 2 [(Cu, Zn) 2 (OH) 3 O] − of distorted copper-z…
The asymmetri cis→trans photoisomerization of cyclo-octene (1) in the presence of the chiral aromatic esters, (–)-menthyl benzoate (2), cholesteryl benzoate (3), or di-(–)-menthyl isophthalate (4) gave (R)-(–)-trans-cyclo-octene with a maximum enantiomeric excess of 4·0%.
Suggestions are g ive n on how to e xpress magne ti c q ua ntities in 51
The crystal structure of the title compound (C10H9N2) [Fe(C10H8N2)3] (ClO4)4 has been determined at c. 295 K from diffractometer data and refined by least squares to R 0.056 (7018 reflections with I &gt; 3s(I)). Crystals are triclinic, Pi, a 16.607(3), b 13.496(3), c 10.254(2) ?, a 101.13(2), ß 92.08(2), ? 102.77(…
The effect of decreasing dissolution rate of nickel oxide per unit surface area in acid solution with increasing prior annealing temperature (700–1450°C) has been shown to occur over a wide range of pH. The linear dependence of log (rate) on pH may be explained on a model of non-oxidative dissolution in which the pH v…
Abstract Two monomeric N ‐substituted bisitaconimides, N , N ′‐bisitaconimido‐ p , p ′‐diphenylmethane and N , N ′‐bis(itaconimido‐ p , p ′‐diphenyl ether), were synthesized from the corresponding diamines. The synthesis was accomplished by reaction of the diamine with itaconic anhydride and cyclocondensation of the r…
The effect of bumetanide upon the endocochlear potential (EP) was examined in 46 guinea pigs. The EP was reduced with dosages of 5 mg/kg or more. The maximum depression of the EP (reduction to -30 to -40 mV) was obtained at a dosage of 30 mg/kg. The recovery of the potential was incomplete at any dosage within three h…
(1978). Fracture Toughness of Powder Metallurgy and Conventionally Produced High-Speed Steels. Powder Metallurgy: Vol. 21, No. 1, pp. 13-28.
This paper shows how capacitance-voltage curves can be used to determine nematic liquid crystal dielectric and elastic constants and surface tilt angles. Careful analysis of the C-V curves reveals that distortion free energy theory is useful up to a V/Vc of about two. A detailed curve of tilt angle as a function of Si…
Conditions and catalyst have been found that cause the hydrometallation of terminal olefins with MgH2 in nearly quantitative yield.
Nous présentons une méthode de calcul qui permet de determiner le nombre de défauts ponctuels créés dans une cascade de déplacements initiée par un ion lourd se ralentissant dans une cible diatomique. La méthode est utilisée pour déterminer le nombre d'atomes uranium et oxygéne places par une fission dans UO2. A compu…
Part 3 describes the solving of water‐conditioning problems that cannot be entirely worked on the Caldwell‐Lawrence diagrams. Some practical aspects of plant operations are discussed as well.
Abstract The secondary electron emission induced by electrons in the energy range 2.5–25 keV was measured in a SEM. Values of the emission coefficient for C, Al, Cu, Mo, Ag and Au are presented showing that it varies systematically with atomic number. The coefficient is still appreciable at 25 keV beam energy. The sig…