Yin Lin、T.J.R. Weakley、Brian M. Rapko 等 4 位作者1993-11-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate (A-.beta.-SiW9O3410-): synthesis, single-crystal structural determination, and solution structural characterization by tungsten-183 NMR and IR of titanotungstosilicate (A-.beta.-Si2W18Ti6O7714-)Yin Lin, Timothy J. R. Weakley, Brian…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
Josef Takats、Xing Wang Zhang、Victor W. Day 等 4 位作者1993-11-01Organometallics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of bis[hydrotris(3,5-dimethylpyrazolyl)borato]samarium(II), Sm[HB(3,5-Me2pz)3]2, and the product of its reaction with azobenzeneJosef Takats, Xing Wang Zhang, Victor W. Day, and Todd A. EberspacherCite this: Organometallics 1993, 12, 11, 4286–4288Publ…
Lanthanide and Transition Metal Complexes
Kouichi Yasuda、Masumi Ono、Katsuhisa Aratani 等 5 位作者1993-11-01Japanese Journal of Applied Physics
Premastered optical disk by superresolution (PSR) for practical use has been achieved for the first time. The PSR disk has a phase-change material Ge 2 Sb 2 Te 5 with stoichiometric composition. Superresolution results from a high contrast ratio of reflectance in the light spot between highly reflective crystal region…
Photorefractive and Nonlinear OpticsPhase-change materials and chalcogenidesOptical and Acousto-Optic Technologies
Richard C. Holz、Larry C. Thompson1993-11-01Inorganic Chemistry
Tris(dipivaloylmethanato)(2,9-dimethyl- 1,10-phenanthroline)lanthanide(III), [L n(DPM)3*DMOP], complexes (Ln = La, Eu, Tb, Ho) were synthesized from [Ln(DPM)3] and 2,9-dimethyl- 1,10-phenanthroline in carbon tetrachloride. The Eu3+ and Tb3+ complexes were characterized spectroscopically by infrared and luminescence te…
Crystal structures of chemical compoundsLanthanide and Transition Metal ComplexesChemistry and Stereochemistry Studies
Oscar P. Bruno、Fernando Reitich1993-11-01Journal of the Optical Society of America A
We recently introduced a method of variation of boundaries for the solution of diffraction problems [ J. Opt. Soc. Am. A10, 1168 ( 1993)]. This method, which is based on a theorem of analyticity of the electromagnetic field with respect to variations of the interfaces, has been successfully applied in problems of diff…
Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings
Linda Medlin、David M. Williams、Pat Sims1993-11-01European Journal of Phycology
The diatoms are one of the best characterised algal groups. Despite this, little is known of the evolution of the group from the earliest cell to the myriad of taxa known today. Relationships among taxa at the family or generic level have been recognised in some diatoms. However, relationships at higher taxonomic leve…
Genomics and Phylogenetic StudiesMicrobial Community Ecology and PhysiologyDiatoms and Algae Research
S. L. Dudarev、Lian‐Mao Peng、M. J. Whelan1993-11-01Physical review. B, Condensed matter
The problem of scattering of high-energy electrons by solids is formulated on the basis of a kinetic equation (KE) for the one-particle density matrix. This equation provides a general treatment of spatial and temporal coherence of electrons and takes account of both elastic and inelastic scattering for arbitrary geom…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesCrystallography and Radiation Phenomena
Michael Engel、Pièrre Bassoul、Louis Bosio 等 6 位作者1993-11-01Liquid Crystals
Phthalocyanines R, PcM (R = alkyl, M = H, Ni, Cu) substituted with alkyl chains have been synthesized and their liquid crystalline properties studied by differential scanning calorimetry and X-ray diffraction at small angles. The influence of the chain length on the mesomorphic properties has been determined. A model…
Surfactants and Colloidal SystemsPorphyrin and Phthalocyanine ChemistryPhotochromic and Fluorescence Chemistry
Giovanna Barbarella、Massimo Zambianchi、Alessandro Bongini 等 4 位作者1993-11-01Advanced Materials
Oligothiophenes in solution and in the solid state have different conformational properties, as can be concluded from the spectroscopic and theoretical data and X‐ray structure of three di‐ and tetramethyl α‐conjugated quaterthiophenes (see Figure) reported here. magnified image
Organic Electronics and PhotovoltaicsConducting polymers and applicationsNonlinear Optical Materials Research
Se Young Oh、Kazuo Akagi、Hideki Shirakawa 等 4 位作者1993-11-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of liquid-crystalline polyacetylenes with a phenylcyclohexyl mesogenic moiety in the side groupSe Young Oh, Kazuo Akagi, Hideki Shirakawa, and Kotaro ArayaCite this: Macromolecules 1993, 26, 23, 6203–6206Publication Date (Print):November 1, 1993Publi…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic Compounds
Lucy M. Bull、Neil J. Henson、Anthony K. Cheetham 等 5 位作者1993-11-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of benzene in siliceous faujasite: a comparative study of deuteron NMR and molecular dynamicsLucy M. Bull, Neil J. Henson, Anthony K. Cheetham, John M. Newsam, and Stephen J. HeyesCite this: J. Phys. Chem. 1993, 97, 45, 11776–11780Publication Date (Print):November 1…
Zeolite Catalysis and SynthesisCrystal Structures and PropertiesSolid-state spectroscopy and crystallography
Kenneth C. Snyder、W. Beall Fowler1993-11-01Physical review. B, Condensed matter
Semiempirical cluster calculations are performed on positive (${\mathrm{E}}_{1}^{\ensuremath{'}}$ center) and neutral oxygen-vacancy defects in \ensuremath{\alpha}-quartz. A comparison is made of the various available Hamiltonians and the use of unrestricted wave functions. The results predict that these two defects f…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid-state spectroscopy and crystallography
Martin Krämer、Michael J. Hoffmann、Günter Petzow1993-11-01Journal of the American Ceramic Society
Isothermal growth of β‐Si 3 N 4 crystals dispersed in an oxynitride glass (Y‐Si‐Al‐O‐N) was studied by electron microscopy after heat treatment at temperatures between 1550° and 1640°C for 1 to 18 h. The β‐crystals exhibited growth striations introduced by intermediate coolings and these striations were used for devel…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsIntermetallics and Advanced Alloy Properties
Masatomo Yashima、Kenji Morimoto、Nobuo Ishizawa 等 4 位作者1993-11-01Journal of the American Ceramic Society
Diffusionless tetragonal ( t′ ) cubic ( c′ ) phase transformation in 65‐mol%‐CeO 2 ‐ZrO 2 was investigated around the c′‐t′ equilibrium temperature T 0 c′‐t′ using powder X‐ray diffraction, where c′ was defined as a tetragonal or cubic phase with an axial ratio of unity. The {400} peak profile of t′ ‐ZrO 2 broadened…
Advanced ceramic materials synthesisZeolite Catalysis and SynthesisNuclear materials and radiation effects
Tadaaki Isozaki、Takayuki Fujikawa、Hideo Takezoe 等 7 位作者1993-11-01Physical review. B, Condensed matter
In order to demonstrate experimentally that the competition between the antiferroelectric and ferroelectric interactions stabilizing Sm${\mathit{C}}_{\mathit{A}}^{\mathrm{*}}$ and Sm${\mathit{C}}^{\mathrm{*}}$ (the pairing energy of the transverse dipole moments in adjacent smectic layers and the packing entropy resul…
Liquid Crystal Research AdvancementsPlant Reproductive BiologyMolecular spectroscopy and chirality
Masaaki Ohba、Hiroko Tamaki、Naohide Matsumoto 等 4 位作者1993-11-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxalate-bridged dinuclear chromium(III)-M(II) (M = copper, nickel, cobalt, iron, manganese) complexes: synthesis, structure, and magnetismMasaaki Ohba, Hiroko Tamaki, Naohide Matsumoto, and Hisashi OkawaCite this: Inorg. Chem. 1993, 32, 23, 5385–5390Publication Date (Print):…
Metal complexes synthesis and propertiesMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
Dominique Luneau、Gerard Risoan、Paul Rey 等 7 位作者1993-11-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal derivatives of a chelating nitronyl nitroxide ligand. Nickel(II) and manganese(II) complexesDominique Luneau, Gerard Risoan, Paul Rey, Andre Grand, Andrea Caneschi, Dante Gatteschi, and Jean LaugierCite this: Inorg. Chem. 1993, 32, 24, 5616–5622Publication D…
Metal complexes synthesis and propertiesCrystal structures of chemical compoundsMagnetism in coordination complexes
Peter Bäuerle、Stefan Scheib1993-11-01Advanced Materials
New crown‐ether‐functionalized alkyl(oligothiophene)s (see Figure) have been synthesized and electropolymerized to alkali metal ion sensitive poly(alkylthiophene)s. It is shown for the first time that the redox chemistry of a conducting polymer is strongly influenced by the specific host‐guest interaction, although th…
Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors
Michael E. Coltrin、David S. Dandy1993-11-01Journal of Applied Physics
The growth of diamond in a subatmospheric dc-arc plasma-jet reactor has been studied theoretically. Full transport equations for this geometry, including gas-phase and surface chemistry, have been solved numerically. The surface-reaction mechanism includes pathways for the incorporation of CH3, C2H2, and C from the ga…
Diamond and Carbon-based Materials ResearchAtomic and Molecular PhysicsLaser-induced spectroscopy and plasma
Fernando Guiberteau、Nitin P. Padture、Hongda Cai 等 4 位作者1993-11-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
A simple Hertzian contact procedure for investigating cyclic fatigue damage in brittle polycrystalline ceramics is described. Repeat loading of a spherical indenter on a coarse alumina ceramic produces cumulative mechanical damage. The mode of damage is one of deformation-induced intergranular microfracture, leading u…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsAdvanced materials and composites