Materials Literature
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Abstract By XPS it is confirmed that copper‐containing catalysts supported on alumina and calcined at high temperature (673–873 k for 24 h.), with or without zinc addition, have a ‘surface spinel’ structure. Combining the XPS results with previous results obtained by vis–UV reflectance spectroscopy and XRD we show tha…
Abstract HNBR, hydrogenated nitrile rubber, is a heat-, oil-, and fuel-resistant elastomer produced by the selective hydrogenation of NBR. As shown in Table I, HNBR is a highly saturated nitrile elastomer consisting of units of acrylonitrile, ethylene, unsaturated butadiene, and hydrogenated vinyl butadiene. The acryl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopochemical induction to an alternating zigzag-linear and "syndiotactic" chain structure in the course of [2+2] photoreaction of alkyl .alpha.-cyano-4-[2-(2-pyridyl)ethenyl]cinnamate crystalsChan Moon Chung, Akira Kunita, Keiichi Hayashi, Fumihiko Nakamura, Kazuhiko Saigo,…
On ODP Leg 119, specimens collected of Eucampia antarctica (Castracane) Mangin var. antarctica exhibited morphological and distribution patterns that contrasted with those of Eucampia antarctica var. recta (Mangin) G. Fryxell et Prasad. E. antarctica var. antarctica was found over the northern Kerguelen Plateau, north…
The effects of aluminum content, ranging from 0.022 to 0.32 wt.%, on the magnetic properties, grain size, and texture of continuous-annealing lamination steels is investigated. Isochronal treatment in the temperature range 700-900 degrees C was conducted by a continuous-annealing simulator. With an increase of the alu…
Abstract A method to evaluate nucleation and crystal growth rates from batch cooling crystallization experiments is presented. Solute concentration and suspension temperature are recorded during the experiment and the product crystal size distribution is analyzed. The crystal growth and nucleation rates at any instant…
The influence of Cu, Kovar, Mo, and W interlayers on the magnitude and distribution of thermal stresses and on the tensile strength of brazed Si3N4− steel joints is examined using a combination offinite element modelling (FEM) calculations and direct experiment. The FEM takes into account plastic flow and changes of m…
A basic-variable, explicit finite difference scheme is used to solve the unsteady and strongly pressure-coupled velocity problems of liquid flows induced both by thermosolutal buoyancies and solidification shrinkage in a binary alloy solidification process. A sample calculation, performed on an IBM personal computer,…
This report examines the effect of processing parameters on the fracture characteristics of three densities of EPS. The fracture toughness of EPS increased as a function of increased molding time and pressure because of incresing bead fusion. Bead fusion is thought to occur by molecular diffusion at the interbead cont…
The dielectric biaxiality of SCE13, a commercially available ferroelectric liquid crystal (FLC) mixture, has been measured. The results have been used to compare theoretically predicted AC field stabilization effects and the voltages for response time minima with experiment.
Abstract On the basis of experimentally determined stabilities of common zeolites, including analcime, stilbite, heulandite, yugawaralite, laumontite and wairakite, T ‐ XQ,phase relations of these zeolites and plagioclase in the presence of excess quartz and H 2 O were constructed for the system CaAl 2 Si 2 0 8 ‐ NaAl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural-bonding analysis of the 50/49/48-electron triangular metal [Co3(.eta.5-C5H4Me)3(.mu.3-S)2]n series in (n = 0,1+,2+): singlet-triplet solution equilibrium of the solid-state diamagnetic 50-electron Co3(.eta.5-C5H4Me)3(.mu.3-S)2 clusterCurtis R. Pullia…
Abstract The effective diffusion coefficient of two granular starch materials was determined from drying experiments by using the method of slopes. A method was developed, which permits the combination of the diffusion coefficient of the solid phase and the binary diffusion coefficient of water vapor in air for the pr…
Using submerged jet electropolishing, extremely thin (less than 10 nm), continuous, thermal oxide "windows" have been prepared on polycrystalline titanium (Ti). The preparation technique is described in detail. It has allowed a systematic investigation of the structure of thermal surface oxide layers on Ti in the thic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of [U(Se2)4]4-: the first homoleptic actinide/polychalcogenide complexAnthony C. Sutorik and Mercouri G. KanatzidisCite this: J. Am. Chem. Soc. 1991, 113, 20, 7754–7755Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the poly(oxymethylene) glycol formation in aqueous formaldehyde solutionsHans Hasse and Gerd MaurerCite this: Ind. Eng. Chem. Res. 1991, 30, 9, 2195–2200Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization thermodynamics of N-phenylmaleimide and its copolymerizations with styrene and phenyl vinyl sulfideShouji Iwatsuki, Masataka Kubo, Makoto Wakita, Yasue Matsui, and Hideki KanohCite this: Macromolecules 1991, 24, 18, 5009–5014Publication Date (Print):September…
Abstract Supersaturated conditions in oceanic and other sedimentary environments, and the crystal morphologies of sedimentary minerals support the occurrence in nature of widespread and powerful crystallization inhibition by extremely small, substoichiometric concentrations (< 1 mg/l) of soluble organic substan…
Results from integral-effects core melt progression experiments and from the examination of the damaged core of the Three Mile Island Unit 2 (TMI-2) reactor are reviewed to gain insight on key severe accident phenomena. The experiments and the TMI-2 accident represent a wide variety of conditions and physical scales,…
The phase relations for the system y 2 o 3 –Ta 2 o 5 in the composition range 50 to 100 mol% Y 2 O 3 have been studied by solid‐state reactions at 1350°, 1500°, or 17000C and by thermal analyses up to the melting temperatures. Weberite‐type orthorhombic phases (W2 phase, space group C222 1 ), fluorite‐type cubic phase…