Materials Literature
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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,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in multinuclear transition-metal complexes. 9. Magnetostructural correlations in one-atom acetato-bridged copper(II) dimersB. Chiari, J. H. Helms, O. Piovesana, T. Tarantelli, and P. F. ZanazziCite this: Inorg. Chem. 1986, 25, 14, 2408–2413Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhodium dicarbonyl sites on alumina surfaces. 1. Preparation and characterization of a model systemJohn L. RobbinsCite this: J. Phys. Chem. 1986, 90, 15, 3381–3386Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986…
A table of water solubility in albite melt at pressure up to 8 kbars is presented. These data have only been published previously in graph form; the weight-loss method was used to determine these solubilities. A recent paper by Dingwell and others critical of the weight-loss method is discussed.
Abstract The melt viscosity of seven liquid‐crystalline side‐group polymers with polyacrylate and polysiloxane main chains is measured as a function of shear rate and temperature. In the isotropic and also in the nematic phase none or only a very small dependence of the melt viscosity on shear rate is observed for the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of open-framework transition-metal phosphates using organometallic precursors in acidic media. Preparation and structural characterization of Fe5P4O20H10 and NaFe3P3O12D. R. Corbin, J. F. Whitney, W. C. Fultz, G. D. Stucky, M. M. Eddy, and A. K. CheethamCite this:…
A study has been made of the precipitation and growth processes which occur during cooling from solution treatment and under isothermal hold conditions in a magnesia‐partially‐stabilized zirconia alloy. Three types of precipitate have been identified which develop during cooling or during isothermal hold treatments ju…
In an attempt to verify the recent proposal that the heme d1 prosthetic group isolated from cytochrome cd1 is not a chlorin, but a dioxo-isobacteriochlorin (Chang, C. K. (1985) J. Biol. Chem. 260, 9520-9522), a model dioxo-isobacteriochlorin has been synthesized possessing a pi-electron system exactly identical to tha…
The possibilities and limitations of analyzing by scanning electron microscopy wool blended with two unmedullated specialty fibers, mohair and cashmere, were studied. The measurement of the height of the cuticle scale at the scale edge was used as an objective criterion for distinguishing between the wool and the spec…