Materials Literature
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Notch effects on strength were investigated for IG-11 and PGX graphite, which were promising materials for core structures of an experimental VHTR in Japan. Notch sensitivity in tensile strength tests decreased as notch radius decreased. Notch sensitivity of IG-11 was higher than that of PGX. Compressive fracturse of…
In the Prony Bay (S.E. New Caledonia) there are many terrestrial and submarine thermal springs. Their chemistry is particularly noti- ccable since pH is still equal to 11 and caused by the only presence of ions OH- without any carbonate or bicarbonate. The cations are calcium and potassium. On ground, the thermal wate…
An intermediate nematic mesophase state has been found to occur in carbonaceous pitches during their thermal transformation to coke and carbon. The molecules responsible for mesophase formation are, by and large, disc-like and mostly aromatic, and their distribution of molecular weights is quite critical. The liquid c…
A theoretical analysis has been carried out on the system consisting of an axisymmetric sessile drop resting on a thin elastic solid in the presence of gravity. The solid is treated in one case as a thin plate and in the other case as a membrane. The consequences of the variational treatment employed are equations rel…
This paper is restricted to the theoretical expressions for calculation of the aerodynamic diameters of fibers based on the viscous drag of prolate spheroids. The volume of the fibers is calculated either by the expression for a cylinder (Harris and Fraser, 1976) or the expression for a prolate spheroid (Khalik and Go…
Strength of Al–Li alloys containing Ll2 ordered δ′-particles have been discussed on the basis of observed behavior of dislocations, taking into account various resistances to dislocation motion in the alloys. The measured yield strength and the observed arrangements of deformation induced dislocations are successfuly…
Abstract Detailed mechanistic pathways are described for starch‐epichlorohydrin (ECH) reaction. The mature and extent of side reactions accompanying the cross‐linking reaction as well as the influence of reaction conditions on these have been demonstrated. The influence of degree of crosslinking of starch on its vario…
Article Dynamic Behaviour of Active Sites of a SiO2-Attached Mo(VI)-Dimer Catalyst during Ethanol Oxidation Observed by Means of EXAFS was published on January 1, 1985 in the journal Zeitschrift für Physikalische Chemie (volume 144, issue 144).
The microstructure of primary carbon filaments formed on supported iron and nickel catalysts has been investigated using transmission electron microscopy, dark-held imaging, and (selectedarea) electron diffraction. It has been established that the filaments consist of cone-shaped graphite layers, stacked with their c-…
Abstract
Abstract A model is presented which relates the crystal size distribution (CSD) from a mixed–suspension, mixed‐product‐removal (MSMPR) crystallizer to the distribution of growth rates. This model is based on the assumption that individual contact nuclei have some inherent growth rate which remains constant, but the gr…
Single crystals of As 2 Se 3 were prepared hydrothermally. The crystal structure was determined by using the intensities of 1014 independent reflections, measured on a computer-controlled single-crystal diffractometer. The cell constants, refined by least-squares, are: a = 12.0774(4), b = 9.9037(6), c = 4.2835(6) Å, β…
Detailed cyclic voltammetric studies were carried out on the hexacyanoferrate(II)-hexacyanoferrate(III) redox system in H2SO4, Na2SO4, NaOH, NaCl, KCl, NaH2PO4, Na2C2O4 and trisodium citrate media on a glassy carbon electrode. The effects of polishing and cleaning, chemical and electrochemical surface treatments, pH,…
Ion exchange of the layered compound K4Nb6O17·3H2O with mono- and bi-valent cations (Li+, Na+, Ca2+, and Ni2+) has been carried out in the aqueous chloride solutions at 90 °C. Only Na+ was found to attain to complete exchange. For exchange with Li+, almost all the K+ ions in the interlayers seemed to be replaced, alth…
Abstract The attack of Cl − , Br − , and I − on the passive layer of iron has been studied by XPS. A pronounced thinning of the oxide is found. The effect decreases in the sequence of ions mentioned above and increases with the halide concentration. With the rotating ring disc technique no increase in Fe 3+ dissolutio…
On discute de la toxicite, de la determination et de la formation de composes du chrome hexavalent dans les refractaires, et particulierement dans le systeme CaO-Al 2 O 3 -Cr 2 O 3
本論文は,構造セラミックスの破壊じん性評価に関するものである.まず,窒化けい素を対象としてSEN法,コントロールド・フロー法,ビッカース・インデンテーション法により破壊じん性試験を行い,各方法の得失を論じた,次に,ピッカース・インデンテーションの解析を有限要素法により行い,その結果よりピッカース・インデンテーション法における一般的な破壊じん性評価式を導出した.
欠陥型ホタル石構造を基本としたC型希土類酸化物のYb2O3とEr2O3の単結晶をアークイメージフローティングゾーン法により作製し, 四軸型単結晶X線回折計を用い, 室温から1260Kまで6点の温度での高温構造の解析を行った. 最終のR因子はYb2O3で0.034から0.050, Er2O3で0.036から0.051であった. 単位胞の平均線熱膨張係数はYb2O3で8.27×10-6K-1 (室温から850K) 及び10.31×10-6K-1 (850Kから1250K), Er2O3で7.47×10-6K-1 (室温から770K) 及び10.74×10-6K-1 (770Kから1250K) である. 欠陥型ホタル石構造における酸素の…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous catalysis of the photoreduction of water by visible light. 4. Cobalt(I) polypyridine complexes. Redox and substitutional kinetics and thermodynamics in the aqueous 2,2'-bipyridine and 4,4'-dimethyl-2,2'-bipyridine series studied by the pulse-radiolysis techniqueH…
Chemical, X-ray, electron optical, and infrared analyses have been made on twenty antigorites form the Nishisonogi and Sasaguri areas, northern Kyushu, Japan, along with two antigorites from other localities. The indexed X-ray powder patterns give various supercell A parameters (A = 35.4–47.2Å) as well as varying subc…