Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration of continuous beams of refractory metal clustersS. J. Riley, E. K. Parks, C. R. Mao, L. G. Pobo, and S. WexlerCite this: J. Phys. Chem. 1982, 86, 20, 3911–3913Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue…
Results of strength and fracture–toughness tests on single crystals of partially stabilized ZrO 2 at temperatures above and below the tetragonal–monoclinic transformation temperature are reported. The temperature dependence of toughening mechanisms is discussed with respect to theories for phase–transformation toughen…
The adsorption of laterally and polarly flagellated bacteria to chitin was measured, and from the data obtained, a modified Langmuir adsorption isotherm was derived. Results indicated that the adsorption of laterally flagellated Vibrio parahaemolyticus follows the Langmuir adsorption isotherm, a type of adsorption ref…
Poly-thiophene perchlorate is prepared electrochemically in an electrolyte of 0.5 M AgClO 4 and 0.2 M thiophene in acetonitrile. Dark greenish film with the complex of ca . [C 4 H 2 S(ClO 4 ) 0.26 ] x is obtained. The electrical conductivity along the film surface is about 0.6 Ω -1 cm -1 .
A Monte Carlo study of self-avoiding walks on the diamond lattice is presented. This model incorporates some of the steric effects and short-range stiffness of real alkanes, and for a nearest-neighbour attractive interaction- epsilon is found to have a collapse transition at k B theta / epsilon =2.25+or-0.05. The beha…
The effects of starvation, glucose refeeding, dibutyryl cAMP, and dexamethasone on expression of the gene for phosphoenolpyruvate carboxykinase (GTP) [GTP:oxaloacetate carboxy-lyase (transphosphorylating), EC 4.1.1.32] from rat liver cytosol was studied by using a cloned cDNA probe. The rate of transcription of the ge…
A series of ceramic compositions based on variations in the crystal–glass ratio of a mullite body were developed. The thermal expansion of these compositions varies from 3.7 to 5.0×10 –6 /°C to 800°C. The materials are particularly useful for applications involving silicon, in that an identical thermal expansion is av…
Abstract Three types of additives for polymers have been studied in polystyrene and poly(methyl methacylate). The effects of a novel thermal stabilizer 3,5‐ditertiarybutyl 4‐hydroxybenzyl thioglycollate (DBHBT), zinc diethyldithiocarbamate (ZnDEC) have been compared with the commercial antioxidant Irganox 1076. It has…
The present research, which has included experiments on both fracture-mechanics specimens and actual pipe sections, has shown that hydrogen gas can dramatically increase fatigue-crack-growth rates in steels that are typical of those used in pipelines. The specific materials used in the present work were ASTM A516, AST…
The U(VI)‐U(V)‐U(IV) redox equilibria were monitored in two sodium aluminophosphate base compositions at a variety of melt temperatures, imposed oxygen fugacities, and uranium contents. The higher redox states of uranium were quite soluble in the phosphate glasses, whereas U(IV) would readily precipitate from the melt…
Abstract The replacement of styrene by other crosslinking monomers in unsaturated polyester resins has been investigated because of the possible toxicity of this monomer and the strong smoke evolution of burning polyester materials. A theoretical study has been carried out to provide criteria for the applicability of…
Abstract The MM 2 force field has been used to calculate the strain energies of a representative series of bridgehead alkenes, and the results compared to similar previous calculations using the MM 1 force field. The new results roughly parallel the old ones, although the strain energy of a given compound is normally…
Summary A sequence of different weathering stages of garnet under humid tropical conditions (Yaounde area, Cameroon) is described micromorphologically and mineralogically. The fissures, already observed in ‘fresh’ garnet in the rock, increase in number and size in the saprolite, and tend to get filled with well crysta…
Abstract Interactions of ammonium sulphates and various silicate and oxide minerals have been studied by X-ray heating methods and simultaneous TG-DTA. Kaolinite and other clay minerals were found to be very susceptible to these sulphating treatments, (NH 4 ) 3 Al(SO 4 ) 3 , (NH 4 )Al(SO 4 ) 2 and Al 2 (SO 4 ) 3 being…
IntroductionBy a non-Euclidean crystallographic (N.E.C.) group, we shall mean a discrete subgroup F of isometries of the non-Euclidean plane with compact quotient space, including those reverse orientation, reflections and glide-reflections.Let G denote the group of isometries of the upper-half plane D and let G / den…
In contrast to , which is an efficient commercial phosphor, isostructural shows poor luminescence efficiency under host excitation at room temperature. In this work, the reason for this difference has been studied by optical measurements of solid solution . As is already known, the charge transfer band of Eu 3+ is loc…
Literature is reviewed on the effect of nickel in low alloy steels on their resistance to hydrogen stress cracking. The greatest portion of literature pertains to H2S environments since there is a controversy in the petroleum industry as to the effect of Ni. Addition of greater than 1 % Ni to carbon and low alloy stee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of the three phases of (NH3C3H6NH3)MnCl4 and a proton nuclear magnetic resonance investigation of its phase transitionsJoseph C. Crowley, Harold W. Dodgen, and Roger D. WillettCite this: J. Phys. Chem. 1982, 86, 20, 4046–4055Publication Date (Print):Septem…
Abstract Crystals of fractionated trans ‐1,4‐polyisoprene (TPI) were grown from amyl acetate solution at two weight fractions, 5.7 × 10 −4 and 0.011; for the lower concentration a precooling followed by heating and then crystallization at temperatures in the 10–32°C range was used, while for the higher concentration t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInductive, steric, and environmental effects in the nonaqueous electrochemistry of hexakis(aryl isocyanide)chromium complexesDavid A. Bohling, John F. Evans, and Kent R. MannCite this: Inorg. Chem. 1982, 21, 9, 3546–3551Publication Date (Print):September 1, 1982Publication H…