Materials Literature
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A method is described for optimizing the field stress on HV insulators by modifying their profile, seeking a uniform distribution of the tangential field along the insulator surface. This results in an increase of the onset voltage for surface flashover and in a significant saving of the space of the HV installation.…
The general properties of quasiperiodic structures obtained by the projection method are given in view of a structural model of aperiodic crystals of type Al-Mn. The local environments, the 2-dimensional projections and the Fourier transform of these structures are particularly examined.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of meso substituents on exchange-coupling interactions in .mu.-oxo iron(III) porphyrin dimersJeffrey H. Helms, Leonard W. Ter Haar, William E. Hatfield, David L. Harris, K. Jayaraj, Glen E. Toney, Avram Gold, Tabitha D. Mewborn, and Jeanne E. PembertonCite this: Inorg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, conductivity, and magnetic properties of (phthalocyaninato)nickel(II) bromideSharon M. Palmer, Judith M. Stanton, Brian M. Hoffman, and James A. IbersCite this: Inorg. Chem. 1986, 25, 14, 2296–2300Publication Date (Print):July 1, 1986Publication History Published…
Dissolution and reaction of yttria‐stabilized zirconia (YSZ) single crystals were investigated in various solutions at 600° to 780°C under 100 MPa. YSZ crystals were not corroded in pure H 2 O and neutral solutions such a LiF, LiCl, NaNO 3 , KCl, KBr; K 2 SO 4 , and Na 2 SO 4 even under severe conditions at 600°C, 100…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical conversion of (.eta.5-C5H5)Fe(CO)2(.eta.1-C5H5) and related complexes to ferrocene and related derivatives: reactivity of the monocarbonyl intermediateJames A. Belmont and Mark S. WrightonCite this: Organometallics 1986, 5, 7, 1421–1428Publication Date (Print):…
Detailed analysis is given of the electromechanical effect in planar S*c liquid crystals. Experimental data are presented for the amplitude of the vibration as a function of the frequency, applied voltage and temperature. The existence and the frequency dependence of the linear electromechanical effect is explained wi…
The decomposition kinetics of hexabromocyclododecane (HBCD), a flame retardant used in foamed polystyrene, were studied by monitoring the rate of HBr formed at temperatures between 180-240°C. Samples from five suppliers, and from two lots from three of the suppliers, were evaluated. There were sig nificant differences…
The split Hopkinson bar was used to determine the stress, strain and strain rate response of woven graphite-epoxy laminates during high shear strain rate deformation. The specimens were oriented and tested in both interlaminar shear and in transverse shear at strain rates ranging from 6000 to 18000 sec -1 . The result…
The reaction of hydrogen peroxide with 5, 10,15,20-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinato- iron(III) hydrate [(P)FeIII(H2O)] has been investigated in water between pH 1 and pH 12. The water-soluble (P)FeIII(H2O) neither aggregates nor forms a mu-oxo dimer. The pH dependence and rate-limiting second-order r…
Cotton cellulose in fiber, yarn, or fabric form was converted from cellulose I to the cellulose III polymorph. Excellent conversion to III was obtained by immersing cotton (cellulose I) in liquid ammonia at room temperature, subjecting it to pressures from 689.5 to 11,721.5 kPa (100 to 1700 psi) while saturated with a…
Polarized anisotropic photoluminescence spectra are presented for the 4F−43/2 I11/2 transitions of YA1O3:Nd3+ and for the 4S3/2–4I9/2 transitions of YAlO3:Er3+. It is shown that differences in the individual linewidth are caused by different degrees of resonance between lattice phonons and sublevel spacings. This mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogenolysis of n-butane over the (111) and (110)-(1.times.2) surfaces of iridium: a direct correlation between catalytic selectivity and surface structureJ. R. Engstrom, D. W. Goodman, and W. H. WeinbergCite this: J. Am. Chem. Soc. 1986, 108, 15, 4653–4655Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCircularly polarized luminescence from racemic lanthanide(III) complexes with achiral ligands in aqueous solution using circularly polarized excitationGary L. Hilmes and James P. RiehlCite this: Inorg. Chem. 1986, 25, 15, 2617–2622Publication Date (Print):July 1, 1986Publica…
Reduction of a highly dispersed 2.85 wt % Rh/Ti02 catalyst at 473 K after previous calcination at 623 K resulted in EXAFS\nwhose primary contributions are due to nearest rhodium (average coordination number of 3.1 and distance of 2.67 A) and\noxygen neiphbors (coordination 2.5 and distance 2.71 A). These oxygen neighb…
Abstract Polybutadienes and polyisoprene are modified using 4‐phenyl‐1,2,4‐triazoline‐3,5‐dione. The resulting urazole moieties give rise to the formation of hydrogen bonds. From the temperature dependence of the dilute solution viscosity as well as from GPC it can be deduced that intra‐ and intermolecular hydrogen bo…
Many areas where concern has arisen over the recent acidification of their surface waters contain podzolic soils developed upon granitic materials. The mineral weathering processes in these soils are reviewed and the ways in which such processes could be altered by acid deposition are considered. The most weatherable…
Abstract Cereal grain yield response to KCI fertilization has been reported on high K‐testing soils in the Northern Plains. Other field studies have demonstrated that wheat ( Triticum aestivum L.) yield increases to CI fertilization occurred where disease incidence was high. Therefore, field experiments on high K‐test…
Deformation and valence-electron densities in silicon are derived via Fourier summation and multipole refinement of highly accurate measurements of X-ray structure factors. These results provide a new perspective for the comparison between theory and experiment. The model electron density derived from experiment is in…
The hybrid protein between the periplasmic maltose-binding protein and the cytoplasmic beta-galactosidase (the MalE-LacZ hybrid protein) was previously shown to block the export of envelope proteins when synthesized in large amounts. Now we show that the hybrid protein exerts another major effect on the cell, that is,…