L. Keith Woo、J. Alan Hays、Robert A. Jacobson 等 4 位作者1991-07-01Organometallics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-valent titanium porphyrin complexes. Synthesis and structural characterization of the first titanium(II) porphyrin complex, (.eta.2-diphenylacetylene)titanium octaethylporphyrinL. Keith Woo, J. Alan Hays, Robert A. Jacobson, and Catherine L. DayCite this: Organometallics…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
P. Bai、J. F. McDonald、T.‐M. Lu 等 4 位作者1991-07-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Vapor-deposited films prepared under low adatom mobility conditions commonly exhibit columnar structures. We present the scanning electron microscopy study of Cu films with a thickness around 3.7 μm deposited on rough Al2O3 ceramic substrates and smooth SiO2 substrates. The Cu films were deposited using the partially…
Copper Interconnects and ReliabilityOptical Coatings and GratingsFluid Dynamics and Thin Films
Shouji Iwatsuki、Masataka Kubo、Toshiyuki Kumeuchi1991-07-01Chemistry Letters
Abstract Poly(phenylene-chloroethylene) film was prepared by the vapor deposition polymerization of 1,9-dichloro[2.2]paracyclophane and was converted into fully extended π-conjugated poly (phenylene-vinylene) by thermal dehydrochlorination at 300 °C under nitrogen for 1 h.
Advanced Polymer Synthesis and CharacterizationInorganic and Organometallic ChemistrySynthesis and properties of polymers
Shin‐ya Koshihara、Y. Tokura、Yoshihiro Iwasa 等 4 位作者1991-07-01Physical review. B, Condensed matter
Photoinduced absorption spectra for vibrational and electronic excitations have been investigated in a prototypical one-dimensional Peierls-Hubbard system, potassium tetracyanoquinodimethane crystals. Strong photoinduced-absorption signals and their temperature-and time-dependent characteristics are discussed in terms…
Magnetism in coordination complexesLuminescence and Fluorescent MaterialsOrganic and Molecular Conductors Research
Edward T. Yu、Michael C. Phillips、J. O. McCaldin 等 4 位作者1991-07-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena
We have used x-ray photoelectron spectroscopy (XPS) to measure the valence band offset in situ for CdSe/ZnTe (100) heterojunctions grown by molecular-beam epitaxy. XPS measurements were performed for films of CdSe (100) and ZnTe (100), and for heterojunctions consisting of either ∼25 Å of CdSe grown on ZnTe or ∼25 Å o…
Chalcogenide Semiconductor Thin FilmsAdvanced Semiconductor Detectors and MaterialsElectron and X-Ray Spectroscopy Techniques
Koichi Awazu、Hiroshi Kawazoe、Ken-ichi Muta1991-07-01Journal of Applied Physics
Silica soots were sintered under a reducing ambient to study the generation mechanism of the oxygen-deficient-type defects in silica glasses. Glasses sintered under H2/He gas mixtures or vacuum were prepared with an intent to produce oxygen-deficient centers. Two optical-absorption bands were generated in the silica g…
Glass properties and applicationsThin-Film Transistor TechnologiesSilicon Nanostructures and Photoluminescence
John Patrick Kociolek、Eugene F. Stoermer1991-07-01Canadian Journal of Botany
Ten Gomphonema taxa and four taxa of Gomphoneis from the upper Laurentian Great Lakes are considered. Gomphonema taxa include five new species and one new variety and a new record for the Great Lakes. Two new Gomphoneis taxa are described. SEM study of Gomphonema species indicates that all have occluded puncta. Occlus…
Diatoms and Algae Research
Andrzej Duda、Stanisław Penczek1991-07-01Makromolekulare Chemie Macromolecular Symposia
Abstract Polymerization of ε‐caprolactone initiated with dialkylaluminum alkoxides is a living system; formation of macrocyclics is fully depressed. Polymerization initiated with diethylaluminum alkoxide and diisobutylaluminum alkoxide proceeds on monomeric (deaggregated) active species, reversibly aggregating into tr…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesBiopolymer Synthesis and Applications
Yasushi Yokoyama、Tatsuo Tanaka、Takeshi Yamane 等 4 位作者1991-07-01Chemistry Letters
Abstract 1,2-Dimethylindolylfulgides with 5-methylthio, 5-methoxy, or 5-dimethylamino group on the indole ring were synthesized and their photochromic properties were examined. Electron donating substituents lengthened the absorption maximum of the colored form and decreased the quantum yields of the photoreactions. T…
Photochromic and Fluorescence ChemistrySynthesis of Indole DerivativesPolydiacetylene-based materials and applications
Monique Henry、E. Boucaud‐Camou、Yves Lefort1991-07-01Aquatic Living Resources
The digestive gland of Pecten maximus consists, as in other lamellibranchs, of numerous blindending tubules which communicate with the stomach by partially ciliated main ducts and non ciliated secondary ducts. The non-ciliated cells of the main ducts are characterized by a well developed brush border constituted by hi…
Meat and Animal Product QualityNeurobiology and Insect Physiology ResearchCalcium Carbonate Crystallization and Inhibition
K.R. Cromack、M. E. Józefowicz、J. M. Ginder 等 9 位作者1991-07-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal process for orientation of polyaniline filmsK. R. Cromack, M. E. Jozefowicz, J. M. Ginder, A. J. Epstein, R. P. McCall, G. Du, J. M. Leng, K. Kim, C. Li, and Cite this: Macromolecules 1991, 24, 14, 4157–4161Publication Date (Print):July 1, 1991Publication History Pub…
Conducting polymers and applications
E. A. Oliveira、A. M. Figueiredo Neto、G. Durand1991-07-01Physical Review A
The interactions of a lyotropic liquid crystal with boundary amorphous glass surfaces are investigated using optical techniques. An unusual phenomenon is observed: the gliding of the director at the surface. A qualitative model is proposed to explain the experimental results.
Liquid Crystal Research AdvancementsPlant and animal studiesPlant Reproductive Biology
Hsin‐Yi Lin、Peter Palffy‐Muhoray、Michael A. Lee1991-07-01Molecular crystals and liquid crystals
We consider the problem of wave guiding by optical fibers with nematic liquid crystal cores. The dielectric properties of the core which govern wave guiding in the fiber are determined by the nematic director field. We focus on the problem of determining the configuration of the liquid crystal in a cylindrical cavity…
Optical Network TechnologiesLiquid Crystal Research AdvancementsNonlinear Photonic Systems
C. J. Jenks、Chao Ming Chiang、Brian E. Bent1991-07-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkyl iodide decomposition on copper surfaces: .alpha.-elimination and .beta.-hydride elimination from adsorbed alkylsCynthia J. Jenks, Chao Ming Chiang, and Brian E. BentCite this: J. Am. Chem. Soc. 1991, 113, 16, 6308–6309Publication Date (Print):July 1, 1991Publication Hi…
Catalytic Processes in Materials ScienceGas Sensing Nanomaterials and Sensors
Richard W. Jordan、L. Ligowski、Eva‐Maria Nöthig 等 4 位作者1991-07-01Diatom Research
Sundström (1986) erected the genus Proboscia for solenoid diatoms whose valves tapered to a proboscis, but only assigned one species to it, the boreal Rhizosolenia alata Brightwell. We have found three species in the modem Antarctic phytoplankton that are affiliated to Proboscia. One is apparently identical to Sundstr…
Marine and coastal ecosystemsMarine Biology and Ecology ResearchDiatoms and Algae Research
Xigao Jian、Allan S. Hay1991-07-01Journal of Polymer Science Part A Polymer Chemistry
Abstract Styrene‐butadiene‐styrene linear block copolymer (SBS) can be epoxidized with hydrogen peroxide in the presence of methyltrioctylammonium tetrakis (diperoxotungsto) phosphate(3‐) as the catalyst in a biphasic system. The effects of reaction time, temperature, solvent, the ratio of the organic phase to the aqu…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsOxidative Organic Chemistry Reactions
Gino Bella、Vittorio Rocco、Michele Maggiore1991-07-01Journal of Engineering for Gas Turbines and Power
This paper will focus on the influence exerted by a nonuniform flow distribution at the inlet of oxidizers to catalytic converters on conversion efficiency evaluated channel by channel. To this aim the flow inside the whole domain, constituted by the exhaust manifold and an elliptic-cross-sectional pipe connecting it…
Advanced Combustion Engine TechnologiesCatalytic Processes in Materials ScienceAerodynamics and Fluid Dynamics Research
Yutaka Kikuchi、TAKAYUKI FUKUI、Tetsuo Okada 等 4 位作者1991-07-01Polymer Engineering and Science
Abstract Polyolefinic thermoplastic elastomer (TPE) is a two‐phase material in which cured EPDM (ethylene‐propylene‐diene rubber) particles are densely dispersed in a PP (polypropylene) matrix. It can be melt‐processed at high temperatures and behaves like a vulcanized rubber at ambient temperature. The question is on…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesTribology and Wear Analysis
Konstadinos C. Douzinas、Robert E. Cohen、Adel F. Halasa1991-07-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of domain spacing scaling laws for semicrystalline diblock copolymersKonstadinos C. Douzinas, Robert E. Cohen, and Adel F. HalasaCite this: Macromolecules 1991, 24, 15, 4457–4459Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Pub…
Theoretical and Computational PhysicsBlock Copolymer Self-AssemblyAdvanced Mathematical Modeling in Engineering
Dieter Sellmann、Michael Geck、Matthias Moll1991-07-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition-metal complexes with sulfur ligands. 62. Hydrogen evolution upon reaction of protons with sulfur-coordinated iron(II) complexes. Investigation of the proton, hydrogen and hydride interactions with iron 1,2-benzenedithiolate complexesDieter Sellmann, Michael Geck,…
Metal complexes synthesis and propertiesCorrosion Behavior and InhibitionMetalloenzymes and iron-sulfur proteins