Michael K. Chan、William H. Armstrong1990-06-01Journal of the American Chemical Society
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…
Photosynthetic Processes and MechanismsMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
R.A. Shenoi、F Violette1990-06-01Journal of Composite Materials
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…
Structural Integrity and Reliability AnalysisEngineering Structural Analysis MethodsMaterial Properties and Applications
P. H. Thornton1990-06-01Journal of Composite Materials
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…
Mechanical Behavior of CompositesHigh-Velocity Impact and Material BehaviorStructural Response to Dynamic Loads
J. R. Mould、J. B. Oke、P. T. de Zeeuw 等 4 位作者1990-06-01The Astronomical Journal
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…
Catalytic Processes in Materials Science
D. Curtin、J. K. Syers1990-06-01Journal of Soil Science
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…
Clay minerals and soil interactionsIron oxide chemistry and applicationsMine drainage and remediation techniques
John P. MacManus、Christopher W.V. Hogue、Brian J. Marsden 等 5 位作者1990-06-01Journal of Biological Chemistry
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…
Chemical Synthesis and AnalysisLanthanide and Transition Metal ComplexesBiotin and Related Studies
B. Z. Jang、L. C. Chen、L. R. Hwang 等 5 位作者1990-06-01Polymer Composites
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…
Mechanical Behavior of CompositesHigh-Velocity Impact and Material BehaviorTransportation Safety and Impact Analysis
Wonwoo Nam、Joan Selverstone Valentine1990-06-01Journal of the American Chemical Society
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…
Porphyrin and Phthalocyanine ChemistryOxidative Organic Chemistry ReactionsOrganic Chemistry Cycloaddition Reactions
Sabine Petit、A. Decarreau1990-06-01Clay Minerals
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…
Clay minerals and soil interactionsIron oxide chemistry and applicationsMineralogy and Gemology Studies
James P. Collman、Xumu Zhang、Robert T. Hembre 等 4 位作者1990-06-01Journal of the American Chemical Society
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…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryPolyoxometalates: Synthesis and Applications
Volker Gnutzmann、W. Vogel1990-06-01The Journal of Physical Chemistry
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…
Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
R. N. Parkins、Preet M. Singh1990-06-01CORROSION
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…
Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metalsStructural Integrity and Reliability Analysis
Mükerrem Çakmak、Yandong Wang、M. Simhambhatla1990-06-01Polymer Engineering and Science
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…
Polymer crystallization and propertiesMicroplastics and Plastic PollutionMaterial Properties and Processing
Leon S. Van Dyke、Charles R. Martin1990-06-01Langmuir
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…
Fuel Cells and Related MaterialsConducting polymers and applicationsAdvanced Chemical Sensor Technologies
Axel T. Brünger、M V Milburn、L Tong 等 9 位作者1990-06-01Proceedings of the National Academy of Sciences
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…
Protein Structure and DynamicsProtein Kinase Regulation and GTPase SignalingEnzyme Structure and Function
Michael J. Readey、Ran‐Rong Lee、John W. Halloran 等 4 位作者1990-06-01Journal of the American Ceramic Society
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…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesIntermetallics and Advanced Alloy Properties
Michael K. Cinibulk、Gareth Thomas、Sylvia M. Johnson1990-06-01Journal of the American Ceramic Society
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…
Advanced ceramic materials synthesisGlass properties and applicationsAdvanced materials and composites
A. Płochocki、S. S. Dagli、R. D. Andrews1990-06-01Polymer Engineering and Science
Abstract In theories of the minor phase (domain) formation in polyblends rendered as emulsions it is usually assumed that the size and shape of the domains are the result of melt viscosity effects (Taylor, Wu) or viscoelasticity effects (VanOene, Elmendorp) being balanced by interfacial tension. This assumption would…
Polymer crystallization and propertiesRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
Huiling Cao、E. Bischoff、Orfeo Sbaizero 等 7 位作者1990-06-01Journal of the American Ceramic Society
The mechanical properties of a series of six fiber‐reinforced ceramics and glasses have been evaluated with the objective of critically assessing present understanding. A major parallel theme has been the characterization of the interface and an assessment of the thermomechanical properties of the interfaces as they r…
Advanced ceramic materials synthesisRock Mechanics and ModelingNumerical methods in engineering
Liang Gao、Demin Tu、Shuai Zhou 等 4 位作者1990-06-01IEEE Transactions on Electrical Insulation
The relationship between the microscopic structure morphology and the electrical strength of polypropylene (PP) film used in PP-laminated paper (PPLP) in very high voltage oil-filled cable is studied by several methods including infrared spectrum, X-ray diffraction and dynamic mechanical spectra. It is found that the…
Polymer crystallization and propertiesHigh voltage insulation and dielectric phenomenaAdvanced Cellulose Research Studies