Sam‐Rok Keum、Mun-Suk Hur、Peter M. Kazmaier 等 4 位作者1991-12-01Canadian Journal of Chemistry
A kinetic and ultraviolet–visible study of a series of thermo- and photochromic dyes is reported. Ultraviolet irradiation of the indolino-benzospiropyran derivatives 1′–4′ leads to their transformation to the open-chain, colored merocyanine forms, which undergo thermal ring closure into the colorless spiro forms. The…
Porphyrin and Phthalocyanine ChemistryPhotochromic and Fluorescence ChemistrySynthesis of Indole Derivatives
C.J. Harding、Vickie McKee、Jane Nelson1991-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly delocalized Cu(I)/Cu(II); a copper-copper bond?Charlie Harding, Vickie McKee, and Jane NelsonCite this: J. Am. Chem. Soc. 1991, 113, 25, 9684–9685Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December 1991ht…
Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesOrganic and Molecular Conductors Research
Chunnian Shi、Fred C. Anson1991-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple intramolecular electron transfer in the catalysis of the reduction of dioxygen by cobalt meso-tetrakis(4-pyridyl)porphyrin to which four Ru(NH3)5 groups are coordinatedChunnian Shi and Fred C. AnsonCite this: J. Am. Chem. Soc. 1991, 113, 25, 9564–9570Publication Dat…
Electrocatalysts for Energy ConversionPorphyrin and Phthalocyanine ChemistryCO2 Reduction Techniques and Catalysts
Eric Blanc、D. Schwarzenbach、H. D. Flack1991-12-01Journal of Applied Crystallography
Methods, implemented into a computer program ( LSABS ), are described which calculate transmission factors and their first derivatives with respect to the positions of the faces of a convex polyhedral monocrystal. Both Gaussian and analytical integration procedures are considered in detail. LSABS has been implemented…
Calcium Carbonate Crystallization and InhibitionCrystallization and Solubility StudiesX-ray Diffraction in Crystallography
D. Balzer1991-12-01Tenside Surfactants Detergents
Article Alkylpolyglucoside - physikochemische Eigenschaften und Anwendung / Alkylpolyglucosides, their Physico-chemical Properties and their Uses was published on December 1, 1991 in the journal Tenside Surfactants Detergents (volume 28, issue 6).
biodegradable polymer synthesis and properties
Wolfgang A. Herrmann、Richard W. Fischer、Dieter W. Marz1991-12-01Angewandte Chemie
Ausgeprägte Lewis‐Acidität ist die Erklärung für die außergewöhnliche Aktivität der Titelverbindung in der katalytischen Olefin‐Epoxidierung mit Wasserstoffperoxid. Das System MTO/ t ‐C 4 H 9 OH/H 2 O 2 epoxidiert selektiv und effizient Olefine unter sehr schonenden Bedingungen (‐ 30 bis + 60°C, in der Regel Raumtempe…
Organometallic Complex Synthesis and CatalysisPolyoxometalates: Synthesis and ApplicationsChemical Synthesis and Reactions
Hideo Hosono、Yoshihiro Abe、Hiroshi Imagawa 等 5 位作者1991-12-01Physical review. B, Condensed matter
We have found a decrease in the intensity of the 7.6-eV band and the appearance of the Si-H band upon heating ${\mathrm{SiO}}_{2}$ glasses, which were prepared by a method involving processes of dehydration with ${\mathrm{Cl}}_{2}$ gas, in ${\mathrm{H}}_{2}$ gas. The absorption cross section of the 7.6-eV band evaluat…
Glass properties and applicationsThin-Film Transistor TechnologiesPhotonic Crystals and Applications
Pamela F. Jones、Teresa Jakubowicz、Brian A. Hemmings1991-12-01Cell Regulation
A novel serine/threonine protein kinase (termed rac-PK) has recently been identified and cloned from cDNA libraries derived from the human cell lines MCF-7 and WI38. A second form of this protein kinase, termed rac protein kinase beta, has been identified from cDNAs derived from the same cell lines. These two closely…
Protein Structure and DynamicsRNA and protein synthesis mechanismsEnzyme Structure and Function
Colin J. Marsden、Kenneth Hedberg、M. Ludwig 等 4 位作者1991-12-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of chromyl nitrate (CrO2(NO3)2) in the gas phase: a novel form of coordination for chromium?Colin J. Marsden, Kenneth Hedberg, M. M. Ludwig, and Gary L. GardCite this: Inorg. Chem. 1991, 30, 25, 4761–4766Publication Date (Print):December 1, 1991Publicatio…
Thermal and Kinetic AnalysisChemical Synthesis and CharacterizationX-ray Diffraction in Crystallography
F. Allan Andersen、Damir Kralj1991-12-01Applied Spectroscopy
Infrarødspektra, vaterit, calcit, analysis
Calcium Carbonate Crystallization and InhibitionCrystallization and Solubility StudiesThermal and Kinetic Analysis
S. F. Rastopov、Anatoly T. Sukhodolsky1991-12-01Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Experiments investigating thermocavitation in binary solutions induced by continuous laser radiation are described. The cavitation consists in periodic rise and collapse of vapor-gas bubbles, accompanied by hydraulic shocks. The necessary condition for obtaining periodic pressure pulses by thermocavitation are investi…
Ultrasound and Cavitation PhenomenaLaser Design and ApplicationsChemical and Physical Studies
N. H. Shah、R. A. Vora、N. D. Jadav1991-12-01Molecular crystals and liquid crystals
Two mesongenic homologous series containing azo group are synthesized. The esters of Series II, III and IV exhibit only the smectic phase. The smectic phase exhibits focal conic or fan-shaped textures. Members of Series I exhibit nematic phases, whereas the members of Series II and IV exhibit enantiotropic smectic pha…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsPhotochromic and Fluorescence Chemistry
Tsugio Sato、Shigeki Sato、Akitsugu Okuwaki 等 4 位作者1991-12-01Journal of the American Ceramic Society
The corrosion rate and changes in the microstructure and fracture strength of alumina ceramics (93.0% Al 2 O 3 and 99.5% Al 2 O 3 ) were studied in 0.1 m to 25 m NaOH solutions at 150°C to 200°C, where m = mol/(kg of H 2 O). The attack of the caustic alkaline solution started at the grain boundaries. Consequently, the…
Concrete and Cement Materials ResearchAdvanced ceramic materials synthesisMagnesium Oxide Properties and Applications
Gary W. Ashley、G.T. Burstein1991-12-01CORROSION
Data have been obtained for the rate of reaction of freshly generated iron surfaces at low potentials with aqueous solutions containing chloride ions. The presence of chloride ions accelerates the formation of the first monolayer of oxidized iron, but with no significant increase in the charge required to form it. The…
Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metalsElectrochemical Analysis and Applications
Joon‐Hyung Byun、Thomas J. Whitney、Guang-Wu Du 等 4 位作者1991-12-01Journal of Composite Materials
The fabric geometric models based on lamination analogy and stiffness averaging method are utilized to numerically characterize a 2-step braided composite. The model predictions were found to be in good agreement with results of mechanical tests performed in this study. The architecture of this material is investigate…
Mechanical Behavior of CompositesTextile materials and evaluationsStructural Analysis and Optimization
Brian W. Sheldon、Theodore M. Besmann1991-12-01Journal of the American Ceramic Society
Individual bundles of ceramic fibers were infiltrated with SiC to study the reaction and diffusion kinetics during isothermal chemical vapor infiltration (CVI). More uniform infiltration was observed in samples where baffles were placed in the reactor and when HCl was added to the inlet gases. The evolution of the mic…
Advanced ceramic materials synthesisAdvancements in Solid Oxide Fuel CellsThermal properties of materials
Галина Л. Старова、С. К. Филатов、V.S. Fundamensky 等 4 位作者1991-12-01Mineralogical Magazine
Abstract The crystal structure of fedotovite, K 2 Cu 3 O(SO 4 ) 3 has been determined, space group C 2/ c , a 19.037(6), b 9.479(2), c 14.231(5) Å, β 111.04(3)°, Z = 8, D x = 3.09 g/cm 3 . The main units of the fedotovite structure are formed around two additional oxygen atoms and consist of edge-sharing [OCu 4 ] tetr…
Crystal Structures and PropertiesPolyoxometalates: Synthesis and ApplicationsInorganic Fluorides and Related Compounds
Ilse Hofmann、Harald Herrmann、Werner W. Franke1991-12-01PubMed
Using a viscometric assay and various electron microscopic procedures (negative staining, rotary shadowing, ultrathin sectioning) we have determined the influences of different kinds of ions and of ionic strength on the structures formed by assembly of soluble subunits of vimentin from bovine lens tissue or from Esche…
RNA Interference and Gene DeliverySkin and Cellular Biology ResearchSilk-based biomaterials and applications
W. W. Emerson1991-12-01Soil Research
Two extreme textural types of cultivated surface soils are mainly considered here, non-shrinking red-brown earths and highly shrinking cracking clays. Total porosity is used to assess the structural status of the former. Values are compared with the highest and lowest values found in the field. For the latter, the cri…
Soil and Unsaturated FlowClay minerals and soil interactionsSoil Management and Crop Yield
Andrew Emerson、G. R. Luckhurst1991-12-01Liquid Crystals
The nematic-isotropic transition temperatures for aromatic calamitic compounds with terminal alkyl chains attached via a methylene group are usually found to be lower than those with an ether link. This difference is generally attributed to the higher anisotropy of the molecular polarizability expected for an ether li…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesNonlinear Dynamics and Pattern Formation