Materials Literature
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Measurements of the emanation coefficients of 222Rn from coal ash were performed. Samples of coal ash from a stoker-fired furnace were mechanically sized into four categories. The mean 226Ra concentration of these categories ranged from 11.82-16.77 dpm g-1 and increased as a function of decreasing particle size. The m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and infrared and Raman spectra of potassium vanadium sulfate (KV(SO4)2)Rasmus Fehrmann, Bernt Krebs, G. N. Papatheodorou, Rolf W. Berg, and Niels J. BjerrumCite this: Inorg. Chem. 1986, 25, 10, 1571–1577Publication Date (Print):May 1, 1986Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron microscopy and magnetic studies of the interaction between nickel and silica: suggestion for possible anchoring sitesL. Bonneviot, M. Che, D. Olivier, G. A. Martin, and E. FreundCite this: J. Phys. Chem. 1986, 90, 10, 2112–2117Publication Date (Print):May 1, 1986Pub…
Projected fatigue life analyses are performed to estimate the endurance of a cardiac valve prosthesis under physiological environmental and mechanical conditions. The analyses are conducted using both the classical stress-strain/life and the fracture mechanics-based damage-tolerant approaches, and provide estimates of…
Three models of the weakening of quartz by small amounts of water are described and analysed. Attention is confined to the glide of dislocations caused by a double-kink nucleation process. The structure of a double kink on a basal 60° dislocation is described and its formation energy estimated using a short-range inte…
A light-harvesting fucoxanthin-chlorophyll a/c-protein complex has been isolated from the diatom Phaeodactylum tricornutum by detergent extraction of thylakoid membranes coupled with sucrose density gradient centrifugation. The isolated complex was devoid of photochemical activity and displayed spectral characteristic…
Abstract The soils on the Mall in Washington, DC have formed in about 6 m of miscellaneous fill deposited in repeated applications to the site during filling operations. Some limited pedogenesis has occurred; cambic, or cambic‐like B horizons were recognized in 26% of the profiles examined. Buried A horizons were foun…
The pseudopotential method is used to examine the structural stability of high-pressure orthorhombic, rhombohedral (A-7), and simple cubic (sc) phases of black phosphorus. The calculated ground-state properties are in good agreement with the measured values for each phase. A total-energy study gives the orthorhombic p…
Abstract A convenient method for the synthesis of poly(benzoxazole)s of high molecular weights has been developed. These polymers were prepared readily by direct polycondensation of aromatic dicarboxylic acids containing phenyl either structure with 3,3′‐dihydroxybenzidine dihydrochloride using phosphorus pentoxide/me…
The dynamics of particle interactions in porous media are studied using a newly formulated mean field theory. Statistical correlations in the gel network are analyzed in detail and found to have a crucial influence on the results. Self-diffusion and mutual diffusion coefficients of Brownian particles moving through a…
Abstract The plasticizing effect of a nonpolar and a polar diluent in ionomers was studied by dynamic mechanical methods in the glassy to rubbery regions. Specifically, a carboxylate and a sulfonate polystyrene‐based ionomer were investigated with variation of diethylbenzene content and of glycerol content. It was fou…
Abstract The crystallization behavior, via annealing, of PEEK was investigated using FTIR spectroscopy. It was found that predominantly amorphous PEEK (e.g., quenched polymer) follows two distinct mechanisms when it is annealed. One is a lower energy relaxation process that involves the partial rotation of the ether l…
Abstract Adsorption of methanol and benzene on alkylammonium montmorillonite, a hydrophobic layer silicate, changes the orientation of the alkylatnmonium ions at the internal and external surfaces. The hydrophobic chains are pushed off from the surface and assume upright orientations. The methanol molecules are adsorb…
Abstract not Available.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of monomeric thiopivalaldehydeEdwin. Vedejs, David A. Perry, and Richard G. WildeCite this: J. Am. Chem. Soc. 1986, 108, 11, 2985–2989Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May 1986https://pubs.a…
A computational methodology is presented for the problem of melting of a pure metal from an isothermal vertical wall. The governing conservation equations of mass, momentum, and energy are solved with a control volume-based discretization scheme adapted for irregular geometries. The moving boundary is immobilized by e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne- and two-electron reduction of metalloporphyrins. Radiation chemical, photochemical, and electrochemical studies. Kinetics of the decay of .pi.-radical anionsM. C. Richoux, P. Neta, Anthony Harriman, S. Baral, and P. HambrightCite this: J. Phys. Chem. 1986, 90, 11, 2462–…
The so-called ‘smectic’ D phase of 4′-n-octadecyloxy-3′-cyanobiphenyl-4-carboxylic acid (one of only four materials known to exhibit this phase) has been shown unambiguously by X-ray diffraction to be characterized by a primitive cubic space group. The space group is either P23 or Pm3, and the lattice parameter a 0 is…
Intramolecular electron transfer is investigated in the mixed-valence complex [Fe30(02CCH3)6(4-Me-py)3] (C6H6), \nwhere 4-Me-py is 4-methylpyridine. Rotational motion of the benzene solvate molecule and the possible influence of this motion \non the rate of intramolecular electron transfer are studied crystall…
Alternating layers of Si (400–500 Å thick) and Rh (200 Å thick), up to 21 layers altogether, have been deposited by electron beam evaporation under high vacuum conditions on to thermally oxidized silicon substrates at room temperature. Many of the as-deposited samples exhibit varying degrees of surface roughness. RBS…