Laser action in emerald
Stimulated emission has been achieved in emerald, a chromium doped beryllium aluminium silicate (Be3Al2Si6O18:Cr3+) crystal over a wavelength band peaked at 684.8 nm.
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Catalysis of the autoxidation of aquated sulfur dioxide by homogeneous metal-phthalocyanine complexes
The autoxidation of sulfur dioxide to sulfate in aqueous solution has been examined over the pH range 4-13 in the presence of water-soluble transition metal-4,4’,4”,4”‘-tetrasulfophthaloc anine com lexes, MTSP (where M = Fe^(II), Mn^(II),Co^(II), Ni^(II), Cu^(II), and V^(IV). Experimental rate data have been analyzed…
Aging effects in n-type semiconducting WO3 films
Photocurrent spectra of the polycrystalline, n-type WO3 film photoanodes are shown to undergo a profound transformation following aging in a photoelectrolysis cell containing an aqueous acidic electrolyte. The observed significant improvement of the photocurrent efficiency of the WO3 photoanodes is assigned to a decre…
Effect of Trace Impurities on Devitrification of Vitreous Silica
Devitrification rates were measured for a series of vitreous silica glasses doped with trace levels of alkali metal oxide (1.6 to 57.8 molar ppm) and aluminum oxide (22 to 73.3 molar ppm). The devitrification rate varies inversely with the molar ratio of aluminum oxide to alkali metal oxide, a direct consequence of th…
Magnetic susceptibility and EPR study of bis(.beta.-alaninium) tetrabromocuprate(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility and EPR study of bis(.beta.-alaninium) tetrabromocuprate(II)Roger D. Willett, Raymond J. Wong, and Michiko NumataCite this: Inorg. Chem. 1983, 22, 22, 3189–3194Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Publi…
Thermal and rheological properties of blends of polystyrene and thermotropic liquid crystals
Abstract The rheological and thermal properties of composites of polystyrene (PS) and two liquid crystalline low‐molecular‐weight additives have been studied. Both additives act as plasticizers as evidenced by decreases in the glass transition and the melt viscosity. In addition both are miscible with PS over a broad…
Phase relationships of rigid rod polymer/flexible coil polymer/solvent ternary systems
Abstract Phase diagrams of two types of rigid rod polymer/flexible coil polymer/methanesulfonic acid (MSA) ternary systems were determined by polarized optical microscopy at ambient conditions. The rigid rod polymer is a wholly aromatic high temperature resistant (no measurable T g ) poly ( p ‐phenylenebenzobisthiazol…
Stepwise assembly of heterometallic M4S4 clusters. The structure of bis[(methylcyclopentadienyl)vanadium] bis(nitrosyliron) sulfide [(MeCp)2V2Fe2(NO)2S4], a 58e cubane
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStepwise assembly of heterometallic M4S4 clusters. The structure of bis[(methylcyclopentadienyl)vanadium] bis(nitrosyliron) sulfide [(MeCp)2V2Fe2(NO)2S4], a 58e cubaneThomas B. Rauchfuss, Timothy D. Weatherill, Scott R. Wilson, and Jeffery P. ZebrowskiCite this: J. Am. Chem.…
Glycerol protection and purification of Bacillus subtilis glucose dehydrogenase.
Bacillus subtilis glucose dehydrogenase (EC 1.1.1.47) has been purified from sporulating cell extract to apparent homogeneity (as determined by polyacrylamide gel electrophoresis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and isoelectric focusing). The enzyme purified as a single molecular species wit…
High temperature crystal chemistry of K and Na fluor-richterites
Anisotropic refinements in space group I2/m using 1150-1200 reflections resulted in R factors ranging from 0.034 to 0.063. Over the temperature intervals studied, the tetrahedral distances remain statistically identical, but all other mean polyhedral distances increase significantly. Differential polyhedral expansion…
Thermogravimetric determination of the coking kinetics of Arab heavy vacuum residuum
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetric determination of the coking kinetics of Arab heavy vacuum residuumRobert C. SchuckerCite this: Ind. Eng. Chem. Process Des. Dev. 1983, 22, 4, 615–619Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 Oc…
An explanation for deviations of Fischer-Tropsch products from a Schulz-Flory distribution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn explanation for deviations of Fischer-Tropsch products from a Schulz-Flory distributionRonald A. Dictor and Alexis T. BellCite this: Ind. Eng. Chem. Process Des. Dev. 1983, 22, 4, 678–681Publication Date (Print):October 1, 1983Publication History Published online1 May 200…
Absolute Measurements of the Thermal Conductivity of Aqueous NaCl Solutions at Pressures up to 40 MPa
Abstract The paper describes absolute measurements of the thermal conductivity of aqueous NaCl solutions in the concentration range 0 to 5 molality, the temperature range 0 to 80°C and the pressure range 0.1 to 40 MPa. An apparatus is based on the transient hot‐wire method using coated wire. The accuracy of the experi…
Low Temperature Stress Corrosion Cracking of Sensitized Inconel 600 in Tetrathionate and Thiosulfate Solutions
This paper addresses some aspects of low temperature stress corrosion cracking (SCC) in Inconel 600 steam generator tubing, a recent instance of which apparently resulted from the contamination of the primary coolant by sulfur compounds. The low temperature SCC of sensitized Inconel 600 was studied in concentrated and…
Environmental Variables in the Low Temperature Stress Corrosion Cracking of Inconel 600
The low temperature stress corrosion cracking of sensitized Inconel 600 has been examined using aerated 1.3% boric acid solutions with small additions of sodium thiosulfate. Cracking is observed for thiosulfate concentrations above 10−6 M. The rate of cracking increases with temperature to at least 80 C. Concentrated…
Strength and Fracture of Engineering Solids
An undergraduated-level text providing an update on theories of strength and practical developments of stronger materials. Attention is also paid to problems with high-performance composite materials, failure analysis, and brittle fracture. Some chapters with problems but no answers. Contents: traditional strength tes…
Dynamic recrystallization in Al–7Mg alloy
The microstructural changes which occur during the extrusion of an Al–7Mg alloy have been investigated using optical and electron microscopy. Light microscopy has shown that recrystallized grains are present both at the original grain boundaries and within the grains, even at the breakthrough pressure. Electron micros…
Solid‐state polymerization of poly(ethylene terephthalate)
Abstract Solid ‐state polymerization of poly(ethylene terephthalate) (PET) is carried out by heating the low molecular weight prepolymer at temperatures below its melting point but above its glass transition temperature. Postcondensation occurs and the condensation byproducts can be removed by applying vacuum or inert…
Electronic and geometric features of (.eta.5-C5H5)ML 16-electron fragments. A molecular orbital study of ligand effects
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and geometric features of (.eta.5-C5H5)ML 16-electron fragments. A molecular orbital study of ligand effectsPeter Hofmann and Moothetty PadmanabhanCite this: Organometallics 1983, 2, 10, 1273–1284Publication Date (Print):October 1, 1983Publication History Publishe…
Hydrogen Atom Positions in Kaolinite by Neutron Profile Refinement
Abstract A structure refinement of kaolinite made using the Rietveld neutron profile refinement technique has given non-hydrogen atom positions which were not significantly different from those given by B. B. Zvyagin in 1960. All of the hydrogen atoms have been located; the three inner-surface hydrogen atoms are invol…