Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion-supported metal carbonyls: synthesis and characterization of {[(OC)2Rh]5(Nb2W4O19)2}3-, {[(OC)2Rh]3(Nb2W4O19)2}5-, {[(OC)2Ir]2H(Nb2W4O19)2}5-, and [(OC)2Ir(P3O9)]2-W. G. Klemperer and D. J. MainCite this: Inorg. Chem. 1990, 29, 12, 2355–2360Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and characterization of binuclear manganese(III,IV) and -(IV,IV) complexes with ligands related to tris(2-pyridylmethyl)amineAderemi R. Oki, Joergen Glerup, and Derek J. HodgsonCite this: Inorg. Chem. 1990, 29, 13, 2435–2441Publication Date (Print):June 1, 1990Publ…
Although the technique of subureteral injection has been widely accepted as an alternative to reimplantation in the treatment of vesicoureteral reflux, the choice of the material to be used is controversial. We have used glutaraldehyde cross-linked bovine collagen to correct vesicoureteral reflux within the context of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetranuclear manganese-oxo complex with a 2.7-.ANG. manganese.cntdot..cntdot..cntdot.manganese separation and intramolecular water.cntdot..cntdot..cntdot.(.mu.-oxygen) hydrogen-bonded contacts: [Mn4O2(TPHPN)2(H2O)2(CF3SO3)2](CF3SO3)3. Possible mode for binding of water at th…
The paper examines the influence of joint geometry on the ability to transfer out-of-plane loads for a hull bulkhead joint in small boats. The hull bulkhead assemblies have been designed on the basis of sandwich beam and laminated plate theories. An analytical solution has also been developed to predict the failure lo…
The effect of fiber diameter, trigger geometry and section geometry on the crush response of pultruded glass fiber reinforced plastic tubes, made with either polyester or vinyl ester resin, was determined at crush rates from 2.1 x 10- 4 m/s to — 15 m/s. The rate dependence of the specific energy for the polyester resi…
Optical multislit spectra of globular clusters in two giant elliptical galaxies in the Virgo Cluster indicate average metal abundances of one- sixth and one-tenth solar composition for M49 and M87, respectively. These estimates are based on the strength of Mg lines. Taken together with observations of globular cluster…
SUMMARY The mechanism of sulphate (SO 4 ) adsorption was investigated using two highly‐weathered soils with contrasting surface‐charge characteristics (one with a net negative charge and the other with a net positive charge). The addition of SO 4 caused a release of OH and increased the adsorption of cations, in keepi…
Fourteen 14-mer peptides corresponding to a consensus sequence of metal-binding loops from proteins of the calmodulin family were synthesized. The effect of varying both the position in the binding loop, and the type of aromatic side chains as energy donors for enhancement of terbium luminescence, was studied. It was…
Abstract The response of advanced composites to low‐velocity projectile loading was investigated. The impact failure mechanisms of composites containing various fibers with different strength and ductility were studied by a combination of static indentation testing, instrumented falling dart impact testing, acoustic e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZinc(II) complexes and aluminum(III) porphyrin complexes catalyze the epoxidation of olefins by iodosylbenzeneWonwoo Nam and Joan Selverstone ValentineCite this: J. Am. Chem. Soc. 1990, 112, 12, 4977–4979Publication Date (Print):June 1, 1990Publication History Published onli…
Abstract: In order to study Al-Fe substitution, Fe-kaolinites were synthesized at 200°C from glasses (Si/(Al + Fe) = 1) with varying Fe content. XRD and IR spectroscopy showed that kaolinites with increasing Fe contents could be synthesized, and Mössbauer spectroscopy indicated that the iron is strictly ferric. Chemic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape-selective olefin epoxidation catalyzed by manganese picnic basket porphyrinsJames P. Collman, Xumu Zhang, Robert T. Hembre, and John I. BraumanCite this: J. Am. Chem. Soc. 1990, 112, 13, 5356–5357Publication Date (Print):June 1, 1990Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural sensitivity of the standard platinum/silica catalyst EuroPt-1 to hydrogen and oxygen exposure by in situ x-ray diffractionV. Gnutzmann and W. VogelCite this: J. Phys. Chem. 1990, 94, 12, 4991–4997Publication Date (Print):June 1, 1990Publication History Published o…
The stress corrosion cracking of a pipeline steel exposed to a carbonate-bicarbonate solution has been studied under various loading conditions, particularly those involving a relatively small component of fluctuating stress applied for various times. It is shown that the coalescence of stress corrosion cracks plays a…
Abstract Poly(ethylene 2,6, naphthalene dicarboxilate), PEN, is very similar to poly(ethylene terephthalate), PET, in its chemical structure and was, therefore, expected to exhibit similar processing characteristics. We, however, observed a few problems during stretching of PEN, the most important of which was necking…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical investigations of electronically conductive polymers. 4. Controlling the supermolecular structure allows charge transport rates to be enhancedLeon S. Van Dyke and Charles R. MartinCite this: Langmuir 1990, 6, 6, 1118–1123Publication Date (Print):June 1, 1990P…
Normal RAS proteins play a key role of molecular switch in the transduction of the growth signal from extracellular to intracellular space. The state of the switch is "on" when GTP is bound and "off" when GDP is bound to the protein. The crystal structure of a complex between a nonhydrolyzable GTP analog and the catal…
Chemical coprecipitation was used to produce ultrafine and easily sinterable MgO‐stabilized and (MgO, Y 2 O 3 ) stabilized ZrO 2 powders. The sintering behavior is very sensitive to post‐precipitation washing because “hard” agglomerates form when the precipitated gels are washed with water, whereas “soft” agglomerates…
Densifying silicon nitride with a YSiAlON glass additive produced 99% dense materials by pressureless sintering. Subsequent heat‐treating led to nearly complete crystallization of the amorphous intergranular phase. Transmission electron microscopy revealed that for heat treatments at 1350°C, only β‐Y 2 Si 2 O 7 was cr…