Virgil Percec、Myongsoo Lee1992-09-01Journal of Macromolecular Science Part A
This paper describes the synthesis and characterization of AB block copolymers based on ω-[(4-cyano-4′-biphenyl)oxy]alkyl vinyl ether (6-n), with alkyl being ethyl (6-2), propyl (6-3), nonyl (6-9), and undecanyl (6-11), with 1H, 1H, 2H, 2H-perfluorodecyl vinyl ether (CF8), poly[(-6-n)-b-CF8]X/Y (where X/Y refers to th…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
Christopher S. Velázquez、Glenn A. Fox、William E. Broderick 等 7 位作者1992-09-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTstar-Porphyrazines: synthetic, structural, and spectral investigation of complexes of the polynucleating porphyrazineoctathiolato ligandChristopher S. Velazquez, Glenn A. Fox, William E. Broderick, Kevin A. Andersen, Oren P. Anderson, Anthony G. M. Barrett, and Brian M. Hoff…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
W J Page、J. Manchak、B Rudy1992-09-01Applied and Environmental Microbiology
Azotobacter vinelandii UWD formed polyhydroxyalkanoate (PHA) copolymers containing beta-hydroxybutyrate and beta-hydroxyvalerate (HV) when grown in a medium containing glucose as the primary C source and valerate (pentanoate) as a precursor. Copolymer was not formed when propionate was added to the glucose medium but…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
S. Hvilsted、F. Andruzzi、P. S. Ramanujam1992-09-01Optics Letters
We report erasable holographic recording with a resolution of at least 2500 lines/mm on unoriented films of sidechain liquid-crystalline polyesters. Recording energies of approximately 1 J/cm(2) have been used. We have obtained a diffraction efficiency of approximately 30% with polarization recording of holograms. The…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications
Kürşad Turgay、Michael Krause、Mohamed A. Marahiel1992-09-01Molecular Microbiology
The entire nucleotide sequence of the Bacillus brevis grsB gene encoding the gramicidin S synthetase 2, which activates and condenses the four amino acids proline, valine, ornithine and leucine has been determined. The gene contains an open reading frame of 13,359 bp which encodes a protein of 4453 amino acids with a…
Protein Structure and DynamicsBacterial Genetics and BiotechnologyEnzyme Structure and Function
Ian M. Walker、Paul J. McCarthy1992-09-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe near-infrared spectrum of the guanidinium ion: a local-mode analysisIan M. Walker and Paul J. McCarthyCite this: Inorg. Chem. 1992, 31, 20, 4122–4127Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992…
Nonlinear Optical Materials ResearchSpectroscopy and Quantum Chemical StudiesSpectroscopy Techniques in Biomedical and Chemical Research
Jörg Neuhausen、Karl-Ludwig Stork、Elisabeth Potthoff 等 4 位作者1992-09-01Zeitschrift für Naturforschung B
Nb 0.89 Fe 0.93 Te 2 and Ta 0.77 Fe 0.90 Te 2 were prepared by chemical transport reactions. The crystal structures of both compounds were determined using X-ray single crystal methods. The structures of the layer compounds Nb 0.89 Fe 0.93 Te 2 (Pmna, Z = 2, a = 7.951(1) Å, b = 7.241(1) A, c = 6.233(1) Å) and Ta 0.77…
Rare-earth and actinide compoundsIron-based superconductors researchInorganic Chemistry and Materials
Tsung‐Shune Chin、Cheng‐Hao Lin、Hao Bai 等 6 位作者1992-09-01IEEE Transactions on Magnetics
Magnetic properties of Sm/sub 2/Fe/sub 17/N/sub x/ and SmFe/sub 5/N/sub y/ with different nitrogen contents are studied. It was found that the magnetocrystalline anisotropy for both Sm/sub 2/Fe/sub 17/N/sub x /and SmFe/sub 5/N/sub y/ alloys changes from easy plane to easy axis at x>0.13 and y>0.07. The 1:5, 1:3, and a…
Magnetic properties of thin filmsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
Çetín Güler、Fatma Tunç1992-09-01Journal of the American Oil Chemists Society
An acid‐activated clay (Çanakkale montmorillonite from Turkey) was used to adsorb chlorophyll from hexane solutions. The phenomenon seems to be mainly driven by the interaction of chlorophyll with acid sites. The adsorption of chlorophyll on Brönsted acid sites was indicated by a characteristic infrared band for the ‐…
Mesoporous Materials and CatalysisClay minerals and soil interactionsAdsorption, diffusion, and thermodynamic properties of materials
C. L. Baker、FJ Lincoln、AWS Johnson1992-09-01Australian Journal of Chemistry
The crystal structure of Ag3CuS2 has been determined by using X-ray powder diffraction data. The unit cell is tetragonal, a = 8.6705(10), c = 11.7573(18) Å , and the space group is I 41/ amd (141) with Z = 8. A starting model for the structure was derived by using direct methods and difference Fourier cycling from 93…
Magnetic Properties and Synthesis of FerritesX-ray Diffraction in CrystallographyPigment Synthesis and Properties
K. Anandakumaran、D. J. Stonkus1992-09-01Polymer Engineering and Science
Abstract This paper presents procedures to monitor oxidation degradation of two commonly used cable insulations, crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR). Since the techniques described require only micro specimens, deterioration of cable insulation can be monitored without destroying the fu…
Polymer crystallization and propertiesHigh voltage insulation and dielectric phenomenaConcrete Corrosion and Durability
Chul‐Un Ro、Richard W. Linton1992-09-01Surface Science Spectra
A commercial LiF powder sample was investigated using x-ray photoelectron spectroscopy. Sample preparation included washing in acetone and methanol, pressing into indium foil and gold decoration for charge correction. Measured binding energies were very similar to those previously reported. [See W. E. Morgan, J. R. Va…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena
Carlos F. Tejero、James F. Lutsko、Jean-Louis Colot 等 4 位作者1992-09-01Physical Review A
The thermodynamic properties of the Yukawa model for colloidal suspensions are determined theoretically from the Rogers-Young integral equation for the fluid phase and from a recently introduced van der Waals--like theory for the solid phases. Very good agreement with the Monte Carlo simulations of Meijer and Frenkel…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
H. Fabricius1992-09-01Applied Optics
Gradient-index filters from Lys & Optik were developed on the basis of an inverse Fourier transformation of the desired spectral characteristics. Filter designs with steep skirts and high reflection are possible because of a new correction method where analytical calculations for rugate structures are used as a basis…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotorefractive and Nonlinear Optics
Kazuaki Tarumi、U. Finkenzeller、Brigitte Schuler Brigitte Schuler1992-09-01Japanese Journal of Applied Physics
Expressions describing the dynamic behaviour in terms of τ on and τ off for twisted nematic structures have been derived through rigorous analysis. The obtained equations are discussed separately for the twisted nematic (TN) and super twisted nematic (STN) cases. Experimentally obtained switching times under various b…
Liquid Crystal Research AdvancementsAdvanced Materials and MechanicsPlant Reproductive Biology
Chiyoko Henmi、Isao Kusachi1992-09-01Mineralogical Magazine
Abstract Clinotobermorite, Ca 5 Si 6 (O,OH) 18 ·5H 2 O, has been found as a vein-forming mineral in gehlenitespurrite skarns at Fuka, Okayama Prefecture. It is associated with tobermorite, plombierite, apophyllite, and calcite. The clinotobermorite is colourless or white and occurs as tabular or acicular crystals. It…
Crystal Structures and PropertiesNuclear materials and radiation effectsChemical Synthesis and Characterization
X.C. Kou、T. S. Zhao、R. Grössinger 等 4 位作者1992-09-01Physical review. B, Condensed matter
The temperature dependence of the ac susceptibility, \ensuremath{\chi}' and \ensuremath{\chi}'', was measured in the temperature range from 4.2 to 300 K for various polycrystalline compounds ${\mathit{R}}_{2}$${\mathrm{Co}}_{17}$, with R=Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu and single-crystalline compound…
Magnetic properties of thin filmsRare-earth and actinide compoundsMagnetic Properties of Alloys
R. J. Ward、Barry Wood1992-09-01Surface and Interface Analysis
Abstract X‐ray photoelectron spectroscopy sensitivity factors for elements from lithium to zinc have been determined experimentally using standard compounds. These are found to differ quite considerably from those theoretically calculated using Scofield's photoelectric cross‐sections, but are in good agreement with ot…
Advancements in Photolithography TechniquesX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
Paul A. Wright、Srinivasan Natarajan、John Meurig Thomas 等 4 位作者1992-09-01Chemistry of Materials
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-metal amorphous and spinel phase oxidation catalysts: characterization by x-ray diffraction, x-ray absorption, electron microscopy, and catalytic studies of systems containing copper, cobalt, and manganesePaul A. Wright, Srinivasan Natarajan, John M. Thomas, and Pratib…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisCatalysis and Oxidation Reactions
G. Bertotti、M. Pasquale1992-09-01IEEE Transactions on Magnetics
A loss model based on a dynamic generalization of the Preisach hysteresis model, in which the standard Preisach algorithm is coupled to an equation for the rate of change of the flux associated with each elementary Preisach loop, is presented. The model is able to predict loss features not explained by previous treatm…
Magnetic properties of thin filmsElectric Motor Design and AnalysisMagnetic Properties and Applications