Materials Literature
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Toughening of whisker‐reinforced (or fiber‐reinforced) ceramics by whisker pullout requires debonding at the whisker/matrix interface. Compressive clamping stresses, which would inhibit interface debonding and/or pullout, are expected in composites where the matrix has a higher thermal expansion coefficient than the w…
The enzyme that catalyzes the ADP-ribosylation and concomitant inactivation of dinitrogenase reductase in Rhodospirillum rubrum has been purified greater than 19,000-fold to near homogeneity. We propose dinitrogenase reductase ADP-ribosyltransferase (DRAT) as the working name for the enzyme. DRAT activity is stabilize…
Lightguides were fabricated from three commercial polyimides of which one contains one and the others contain two hexafluoroisopropylidene (6F) groups. The latter are isomers using either the para or the meta isomer of the same diamine. As the number of 6F groups increases the optical losses of the corresponding light…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergetics of acetylene-addition mechanism of diamond growthD. Huang, M. Frenklach, and M. MaroncelliCite this: J. Phys. Chem. 1988, 92, 22, 6379–6381Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988https…
Abstract Several substituted Fe‐ and Co‐containing tetraphenylporphins 1 were loaded on carbon either by adsorption from acetone or by in situ synthesis on the carbon support. The porphin/carbon combinations were pyrolyzed at 800°C. The electrocatalytic activities in the reduction of dioxygen were investigated in alka…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugate addition of N,N-dialkylhydroxylamines. Mechanism of O-alkylation by 1H-pyrrole-2,5-dionesStephen D. Pastor and Edward T. HessellCite this: J. Org. Chem. 1988, 53, 24, 5776–5779Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Pu…
This paper deals theoretically with the interaction between two nonspherical cavitation bubbles in liquids by means of twin spherical expansions. Governing equations of bubble boundaries are derived by taking account of the translational motion of the bubbles in an incompressible liquid, and are exact to the order ( R…
This review updates a review published in 1982 on the effect of nickel additions to low alloy steels on their resistance to hydrogen stress cracking (HSC). More recent research has demonstrated that nickel has no effect on sulfide stress cracking (SSC) of steels. However, the occurrence of surface trenches that may re…
The effects of molecular weight of the base silicone, filler and copolymer concentrations on compression set, strain, creep and dynamic elastic modulus were determined. The molecular weight of the base silicone had the least effect on these properties although low molecular weights showed better properties. Chain exte…
Abstract Die Einflüsse von Mo, V, Nb, Ti, Zr und deren Karbiden auf die Korrosion und Wasserstoffaufnahme von Eisen in 1 M H 2 SO 4 /N 2 25°C wurden an binären und ternären Fe‐Me‐Legierungen mit rund 0,2 At.‐% Me mittels elektrochemischer und oberflächenanalytischer Meßmethoden untersucht. Unter den Versuchsbedingunge…
Abstract The use of HBTBP as a crosslinking agent in fluoroelastomers has been reported. HBTBP was found to be especially suitable for FKM-G polymer, and the mechanism of crosslink formation in this fluoroelastomer was investigated. Compounding studies, swelling measurements, solvent extraction, and nitrogen tests hav…
Powder Metallurgy (P/M) materials, especially those made of high strength steels, are often reported in the technical literature to have poor machinability when compared to their wrought or cast counterparts. In order to characterize the machinability of single phase P/M materials and to identify the influence of poro…
C 76 H 92 N 4 O 4 Pd. 3C 6 H 12 cristallise dans C 2 /c avec affinement jusqu'a 0,086. C 76 H 92 N 4 O 4 Zn. 4C 6 H 12 cristallise dans C 2 /c avec affinement jusqu'a 0,10
Abstract Possible differences in soil characteristics between ortstein and nonortstein Spodosols were studied. Organic C, fine particles (silt plus clay), and extractable Al by dithionite‐citrate, pyrophosphate, acid NH 4 oxalate, and NaOH were all higher in Bh than other horizons, except silt plus clay contents in Bt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic nitrosyl chemistry. 37. Synthesis, characterization, and some chemical properties of unusual 16-electron dialkyl(.eta.5-cyclopentadienyl)nitrosylmolybdenum and -tungsten complexesPeter Legzdins, Steven J. Rettig, and Luis SanchezCite this: Organometallics 1988…
Iron(II) and nickel(II) complexes of 2,2'bithiazole (2bt) have been prepared. Salts of [Fe(2bt)3]2+ have spectral properties typical of iron(II) diimine systems. Their magnetic and Mossbauer spectral properties show an anomalous temperature-dependence which is associated with a temperature-induced singlet (1A1) ? quin…
A mathematical model is suggested for studying the radial packing density of yarn, and the proposed model is used for a comparative study of ring and rotor spun yarns. The results show that rotor spun yarn consists of a smaller number of fibers in the cross section compared to ring spun yarn, which explains the lower…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic states and potential energy surfaces of rhodium dihydrideK. Balasubramanian and Dai Wei LiaoCite this: J. Phys. Chem. 1988, 92, 22, 6259–6264Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988htt…
Abstract Soils on hillslopes in the Grand Prairie and eastern Edwards Plateau regions of Texas are developed from multiple facies of interbedded weakly to strongly indurated Cretaceous limestones. Most contain either calcic or petrocalcic horizons. Stable C isotope analysis of the carbonate‐enriched horizons from seve…
Summary A mathematical model was developed to describe the scale-inhibitor-adsorption squeeze process. The objective of this study was to create a tool that will predict the duration of a squeeze treatment, given the operating parameters and the rock and inhibitor properties. Assuming that there is local equilibrium b…