Materials Literature
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A quantitative theoretical model which accounts for the variations of ionic conductivity of calcia‐stabilized zirconia, , with oxygen vacancy concentration, , and temperature, , has been developed based on the consideration of effective anion‐site coordination of effectively negatively charged calcium ion, Ca 2' . The…
Solid samples of a nonhydrolytically stabilized bisphenol-A polycarbonate were hydrolyzed at 125°C and 1.4 atm of steam. IR and UV techniques were used both to estimate the degree to which the unhydrolyzed polymer is capped by a chain-terminating agent and to determine the rate of hydrolysis as indicated by the format…
Recent experiments using synchrotron radiation to measure anomalous scattering terms at wavelengths very close to L-shell elemental absorption edges [Phillips, Templeton, Templeton, & Hodgson (1978). Science, 201, 25 7-259] have demonstrated that effects much larger than those expected on the basis of simple atomic sc…
Fundamental characteristics of electron penetration in solids, such as energy and angular distributions of transmitted electrons, have been theoretically calculated using a Monte Carlo approach. The essential features of the Monte Carlo approach are the inclusion of the random nature of inelastic scattering events, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmpirical Studies of Hydrophobicity. 1. Effect of Protein Size on the Hydrophobic Behavior of Amino AcidsH. Meirovitch, S. Rackovsky, and H. A. ScheragaCite this: Macromolecules 1980, 13, 6, 1398–1405Publication Date (Print):November 1, 1980Publication History Published onli…
Abstract The facile preparation of zinc(II) meso ‐tetraphenylporphyrin (Zn TPP) and derivatives from substituted benzaldehydes and pyrrole, combined with the calculation of ring current shifts in these molecules, provides a useful series of selective diamagnetic shift reagents. The porphyrin‐ligand equilibrium is exam…
The Sternheimer quadrupole antishielding factor ${\ensuremath{\gamma}}_{\ensuremath{\infty}}$ including self-consistency effects have been studied for several closed-shell ions isoelectronic with He, Ne, A, Kr, Xi, ${\mathrm{Cu}}^{+}$, and ${\mathrm{Ag}}^{+}$ in both free state as well as in ionic solid-state systems.…
Elemental sulfur undergoes oxidation to sulfate when heterogeneous mixtures of sulfur and water absorb ionizing radiation in deaerated systems. No sulfur-containing product other than sulfuric acid is formed in measurable yield. The reaction is initiated by OH radicals from water, and these are evidently involved in s…
KEYWORDS: radioactive combustible wasteswaste processingvolume reductionacid digestionion exchange resinsorganic waste materialshydrogen peroxide
A new rechargeable cell Na/Na + ion in molten is described. This cell operates at temperatures in the range of 180°–250°C and has an open‐circuit voltage of 4.2V. The discharge process involves the reduction of tetravalent sulfur to the elemental state; sulfur can be further reduced to sulfide. The preferred sodium io…
A single crystal LaB6 electron gun for variably shaped beams was developed. For the 50 A/cm2 density, 3 μm length maximum beam size, and 1 μA maximum beam current, the best electron gun characteristics were analysed. Optimum brightnesss is 2.5×105 A/cm2 sr. The product of crossover diameter and beam divergence semiang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntropy, enthalpy, and side-arm porphyrins. 2. Crystal and molecular structure of a 5-coordinate zinc porphyrin with a four-atom chain attaching the pyridyl ligand to the tetraphenylporphyrinMichael A. Bobrik and F. Ann WalkerCite this: Inorg. Chem. 1980, 19, 11, 3383–3390Pu…
Infrared absorption spectra between 50 and 350 cm−1 have been obtained of argon matrices containing UO3 and UO2. The frequencies of all three expected low-frequency vibrational modes of U16O3 have been identified and measured (±0.1 cm−1): ?3(A1)=186.2, ?5(B1)=211.6, and ?6(B2)=151.5 cm−1. The effects of 18O-substituti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of cofacial dicopper hexyldiporphyrin-7Marcos H. Hatada, A. Tulinsky, and C. K. ChangCite this: J. Am. Chem. Soc. 1980, 102, 23, 7115–7116Publication Date (Print):November 5, 1980Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResponse of Catalyst Surface Concentrations to Forced Concentration Oscillations in the Gas Phase. The NO, CO, O2 System over Pt-AluminaL. Louis Hegedus, Charles C. Chang, David J. McEwen, and Elaine M. SloanCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 4, 367–373Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdenum(V) tetraphenylporphyrin complexes revisited. Preparation and characterization of oxohydroxo(5,10,15,20-tetraphenylporphyrinato)molybdenum(V), O = Mo(TPP)OHHenry J. Ledon, Michel C. Bonnet, Yves Brigandat, and Francois VaresconCite this: Inorg. Chem. 1980, 19, 11,…
A scanning electron microscope investigation has been conducted on selected line-pipe steels that had been exposed to the hydrogen sulfide in the British Petroleum test. The results show that: (1) Hydrogen induced blister cracking initiates at elongated manganese sulfide inclusions confirming the findings of other wor…
Abstract In its present state this model should be effective as an aid in analyzing and optimizing cure cycles for vulcanizing articles. It is clearly necessary to have accurate thermo-physical data when simulating the SOC in thick articles. Additional improvements could be realized by more careful treatment of the he…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn efficient, high conversion photoinduced emulsion polymerization. Magnetic field effects on polymerization efficiency and polymer molecular weightNicholas J. Turro, Ming-Fea Chow, Chao-Jen Chung, and Chen-Ho TungCite this: J. Am. Chem. Soc. 1980, 102, 24, 7391–7393Publicat…
Young's modulus at room temperature and the fracture surface energy, up to 1200°C, were determined for boron carbide specimens with 0 to 15% porosity. Sonic modulus measurements indicated that the Young's modulus decreased as porosity increased in a manner characteristic of the cylindrical pore model. The fracture sur…