Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA theoretical survey of unsaturated or multiply bonded and divalent silicon compounds. Comparison with carbon analogsB. T. Luke, J. A. Pople, M. B. Krogh-Jespersen, Y. Apeloig, M. Karni, J. Chandrasekhar, and Paul v. R. SchleyerCite this: J. Am. Chem. Soc. 1986, 108, 2, 270–…
The behaviour of large air-insulated structures subjected to complex multiple-peak surge overvoltages is influenced by the presence of already established leader overvoltages in influenced by the presence of already established leader development in the space. The decay processes of a positive leader channel following…
残油FCC触媒を選定する際の指針を得る目的で, 残油を分解した時の生成物の選択性と触媒の性状との関係について検討した。スチーム処理により疑似平衡化した三種類の市販触媒についてパイロットテストを実施した結果, 生成物の選択性には触媒マトリックスの細孔分布が大きく影響していることが明らかになった。これは, 残さ留分の分解は, 液状でマトリックスの細孔内に拡散し, 細孔表面上で比較的小さな分子へ予備分解したのちに, ゼオライト上で最終生成物へと分解するためである。残油FCCにおいては, 原料油の残さ留分の平均分子サイズに対応した細孔径範囲に多くの細孔が分布しているような触媒を選定する必要がある。
The lipid, fatty acid, glucan, protein, and chlorophyll contents of nutrient-starved and nutrient-stressed cells of Cyclotella meneghiniana Kütz. were investigated in batch and semicontinuous culture experiments, respectively. In batch culture experiments, cells were removed from nutrient-replete media, resuspended in…
Article The Diatom Genus Thalassiosira Cleve in Gulf Stream Warm Core Rings: Taxonomy, with T. intrannula and T. lineoides, spp. nov. was published on January 1, 1986 in the journal Botanica Marina (volume 29, issue 1).
At a 130°C temperature, which can be regarded as conservatively representing the temperature in the annulus of a pressurized water reactor (PWR) during the first phase of a design basis loss-of-coolant accident (LOCA), no significant difference was found in the retention of 131I loaded as elemental iodine by various f…
The electrocatalytic activities of heat-treated chloro(tetraphenylporphyrinato)iron(III)(ClTPPFeIII) for oxygen reduction have been studied using the rotating ring–disc electrode technique and compared with those of heat-treated TPPCoII and TPPNiII. ClTPPFeIII gives an unusual result, not observed for TPPCoII or TPPNi…
The rolling contact fatigue life of bearing steel is improved with decreases in the oxide nonmetallic inclusions. The oxygen content of high carbon chromium bearing steel has been reduced to an average level of 5.8ppm. This is accomplished through the combined processes of an electric arc furnace, a ladle furnace, an…
Poly(amide-urethanes) with long repeating units were prepared from 2-aminoethanol, α,ω-alkylene dicarboxylic acid chlorides, and 1.6-diisocyanatohexane. These partially crystalline polymers undergo slow hydrolysis when suspended in buffered water but were found to be more readily degraded by the enzyme subtilisin.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of terminal metal hydrides: solution and matrix-isolation studies of [(.eta.-C5H5)2MHn]x+ (M = Re, Mo, W, Nb, Ta; n = 1-3; x = 0, 1)Reuben B. Girling, Peter Grebenik, and Robin N. PerutzCite this: Inorg. Chem. 1986, 25, 1, 31–36Publication Date (Print):Ja…
Article Some Physico-Chemical Properties of Bismuth Chalcogenides x-Ray Photoelectron and Diffuse Reflectance Spectra was published on January 1, 1986 in the journal Zeitschrift für Physikalische Chemie (volume 267O, issue 1).
General effects of five types of ageing on textiles are examined. The types of ageing discussed are physical, photochemical, thermal, chemical and mechanical. Changes in the structure and properties of textiles that result from each type of ageing are discussed in general terms. This paper is expected to provide conse…
The dielectric conditions which are unique to converter transformers and smoothing reactors are examined. Both steady state and transient situations are discussed. Two additional tests are recommended for this equipment - a long term dc applied potential test and a polarity reversal test. Formulae are developed to cal…
Abstract The luminescence processes in several rare‐earth compounds are discussed, viz. sensitization, one‐step energy transfer, multi‐step energy transfer (migration) and trapping. Results are given for compounds containing Eu 3 + , Tb 3+ and Gd 3+ . The dimensionality of the rare‐earth sublattice (three, two or one)…
The effects of the laminated paper layer direction on the conductivity and the dc breakdown strength in oil-impregnated paper were experimentally clarified. It was confirmed that not only oil and paper discharges through the laminated paper layers, but also paper discharges along them triggered total flashover in oil…
The ignition of metals and alloys by impacting high-velocity particles in gaseous oxygen was investigated. A convergent/divergent nozzle was used to accelerate the flowing oxygen, which in-turn accelerated the particles to velocities greater than 305 m/s (1000 ft/s). The test sample (target) was placed at the end of t…
Zinc oxochlorins (porphyrinones) react with osmium tetroxide to give exclusively adjacent-ring saturated isobacteriochlorins without any bacteriochlorins that would normally arise from such a reaction with free base porphyrinones; the diols can be converted into the baem d1-like porphyrindiones.
Abstract The current values reported for the Gibbs free energy of formation for magnesite [MgCO 3 (s)] are bimodally grouped, centered at −1012 kJ mol −1 and in the range −1026 to −1030 kJ mol −1 . The solubilities of three natural magnesites in aqueous solution were determined in order to verify the appropriate value…
Composition-based correlations to predict the relative sensitization resistance of AISI 304 and 316 stainless steel (SS) have been evaluated by comparison to a large data base. The best fit to experimental data was achieved using a slightly modified version of Cihal’s elemental parameters: Cr⋆=Cr+1.6Mo−0.2Ni−100Cwhere…
Binding energies of carbonaceous overlayers on ruthenium were measured using angle-resolved XPS data and curve fitting procedures. A carbonaceous overlayer prepared by dehydrogenation of adsorbed ethylene at 750 K was disordered and had a binding energy of 285.0 eV. After annealing to 1300 K islands of azimuthally ord…