Rafik Karaman、Seungwon Jeon、Örn Almarsson 等 4 位作者1992-06-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza bridged closely interspaced cofacial bis(5,10,15,20-tetraphenylporphyrins). 3. Interplanar distances, proton NMR chemical shifts, and the catalysis of the electrochemical reduction of oxygenRafik Karaman, Seungwon Jeon, Orn Almarss…
Porphyrin and Phthalocyanine ChemistryElectrochemical Analysis and ApplicationsSurface Chemistry and Catalysis
Richard A. Nyquist、C. L. Putzig、M. A. Leugers 等 5 位作者1992-06-01Applied Spectroscopy
Vibrational assignments for α-syndiotactic polystyrene are made with the use of parallel and perpendicular polarization of uniaxially oriented film, and by comparison of vibrational data and assignments for toluene and atactic and isotactic polystyrene. Vibrational assignments are given for a cast film of β-syndiotact…
Polymer crystallization and propertiesMicroplastics and Plastic Pollution
F. Ciccacci、E. Vescovo、G. Chiaia 等 5 位作者1992-06-01Review of Scientific Instruments
A spin-polarized electron gun for electron spectroscopies is described in detail. The gun consists of an electron source based on a negative electron affinity GaAs photocathode coupled to an appropriate transport electron optics. The gun has been designed with the aid of ray-tracing analysis and then accurately tested…
Advanced Electron Microscopy Techniques and ApplicationsElectron and X-Ray Spectroscopy TechniquesPhotocathodes and Microchannel Plates
M.W.J. Crajé、Stefan P. A. Louwers、V.H.J. de Beer 等 5 位作者1992-06-01The Journal of Physical Chemistry
EXAFS measurements were performed on four sulfided catalysts with the same compn. as their 57Co-contg. counterparts which were previously characterized by Moessbauer emission spectroscopy. The Co species in Co/C catalysts with a Co-Mo-S-like Moessbauer emission spectrum after sulfidation at 373 K is similar to the spe…
Electrocatalysts for Energy ConversionX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
Gary S. Grest、Kurt Kremer、Edgardo Duering1992-06-01Europhysics Letters (EPL)
The kinetics of the end crosslinking process in linear-polymer melts is studied using molecular-dynamics simulations. Starting from an equilibrated melt, tetrafunctional crosslinkers are attached randomly to a fraction x of the chain ends. The system is then allowed to evolve. When a free end comes within a short reac…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesRheology and Fluid Dynamics Studies
Brian L. Phillips、R. James Kirkpatrick、Michael A. Carpenter1992-06-01American Mineralogist
Spectroscopic data are presented for a series of synthetic anorthite samples crystallized from a glass of the same composition and annealed at 1400°C for times of 1mn to 179h. The NMR spectra resemble those of natural Al,Si ordered An-rich feldspars but contain peaks at more negative chemical shifts, indicating the pr…
Concrete and Cement Materials ResearchBuilding materials and conservationClay minerals and soil interactions
Joseph A. Chinn、Sylvia E. Posso、Thomas A. Horbett 等 4 位作者1992-06-01Journal of Biomedical Materials Research
Residence time-dependent changes in fibrinogen after adsorption to six different polyurethanes were examined by measuring polyclonal antifibrinogen binding to the adsorbed protein. The amount of adsorbed fibrinogen that could be eluted by sodium dodecyl sulfate (SDS) was also measured. Baboon fibrinogen was first adso…
Polymer Surface Interaction StudiesMicrofluidic and Bio-sensing TechnologiesBlood properties and coagulation
C. K. Kim、D. R. Paul1992-06-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of polycarbonate molecular structure on the miscibility with other polymersC. K. Kim and D. R. PaulCite this: Macromolecules 1992, 25, 12, 3097–3105Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https:/…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesFiber-reinforced polymer composites
Shin‐ichi Hirano、Toshinobu Yogo、Koichi Kikuta 等 5 位作者1992-06-01Journal of the American Ceramic Society
Perovskite potassium tantalate niobate (KTN) powders and thin films were synthesized from a metal alkoxide solution. Homogeneous KTN coating solutions were prepared from KOC 2 H 5 , Ta(OC 2 H 5 ) 5 , and Nb(OC 2 H 5 ) 5 in absolute ethanol. The precursor crystallized to pyrochlore at ∼ 650°C, and then to perovskite at…
Ferroelectric and Piezoelectric MaterialsLayered Double Hydroxides Synthesis and ApplicationsMicrowave Dielectric Ceramics Synthesis
Rudolf Neuhaus、Ch. Schwink1992-06-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
Cu-Mn single crystals oriented for multiple slip with [111] and [100] axis have been deformed in tension at room temperature. The Mn content was 0.8 at.% for the [111] and 3at.% for the [100] crystals. The observed decrease in the workhardening rate with increasing reduced shear stress τ—τ0 coincides with the linear d…
Microstructure and mechanical propertiesMetal Forming Simulation TechniquesMetallurgy and Material Forming
Hans Ullrich Siehl、Frank Peter Kaufmann1992-06-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR spectroscopic determination of the magnitude of the .beta.-silyl stabilization effect in 1-mesitylvinyl cationsHans Ullrich Siehl and Frank Peter KaufmannCite this: J. Am. Chem. Soc. 1992, 114, 12, 4937–4939Publication Date (Print):June 1, 1992Publication Histo…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisChemical Synthesis and Characterization
H. Suzuki、Takeshi Endoh1992-06-01IEEE Transactions on Electrical Insulation
An experimental study of pattern recognition of partial discharge (PD) in a crosslinked polyethylene (XLPE) cable by using a neural network (NN) system is described. The NN system was a three-layer artificial neural network system with feedforward connections, and its learning method was a backpropagation algorithm in…
High voltage insulation and dielectric phenomenaPower Transformer Diagnostics and InsulationElectrostatic Discharge in Electronics
C.Z. Wang、C. T. Chan、Kai‐Ming Ho1992-06-01Physical review. B, Condensed matter
We have carried out molecular-dynamics simulation of liquid Si using the tight-binding Hamiltonian proposed by Goodwin, Skinner and Pettifor. The simulation results on the structural and dynamical properties (radial and angular distribution functions, the electronic density-of-states, and the diffusion constant) are p…
Material Dynamics and Propertiesnanoparticles nucleation surface interactionsThermodynamic and Structural Properties of Metals and Alloys
Atsushi Morikawa、Masa‐aki Kakimoto、Yoshio Imai1992-06-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent synthesis of siloxane starburst dendrons and dendrimers via hydrosilylationAtsushi Morikawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1992, 25, 12, 3247–3253Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Publis…
Advanced Polymer Synthesis and CharacterizationConducting polymers and applicationsDendrimers and Hyperbranched Polymers
JOAQUIN BARBERA、Carlos Cativiela、José Luís Serrano 等 4 位作者1992-06-01Liquid Crystals
Several aromatic β-diketones with a different number of alkyloxy groups in the aromatic rings and their derived pyrazoles, isoxazoles and thallium (I) complexes have been synthesized. The potential mesomorphic properties of these compounds have been investigated by optical microscopy, DSC and X-ray diffraction. The py…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsAdvanced Materials and Mechanics
Verena Rehaber、Rainer Jaenicke1992-06-01Journal of Biological Chemistry
The molecular basis of thermal stability of globular proteins is a highly significant yet unsolved problem. The most promising approach to its solution is the investigation of the structure-function relationship of homologous enzymes from mesophilic and thermophilic sources. In this context, D-glyceraldehyde-3-phospha…
Enzyme Structure and FunctionAmino Acid Enzymes and MetabolismBiochemical and Molecular Research
E. K. Parks、Bernd Winter、T. D. Klots 等 4 位作者1992-06-01The Journal of Chemical Physics
Experimental evidence is presented that small (19- to 34-atom) clusters of iron, cobalt, and nickel tend to adopt polyicosahedral structure when saturated with ammonia. Clusters in the polyicosahedral series (having 19, 23, 26, 29, 32, and 34 atoms) often saturate with 12 NH3 molecules, the expected number for polyico…
Hydrogen Storage and MaterialsAmmonia Synthesis and Nitrogen ReductionChemical Synthesis and Characterization
Katsunori Yogo、Satoru Tanaka、Michito Ihara 等 5 位作者1992-06-01Chemistry Letters
Abstract The reduction of NO with propane in the presence of excess oxygen was investigated using gallium ion-exchanged zeolite catalysts, among which ferrierite(Ga-ferrierite) and ZSM-5(Ga-ZSM-5) showed high activity in a wide range of reaction temperature.
Catalytic Processes in Materials ScienceZeolite Catalysis and SynthesisCatalysis and Oxidation Reactions
H.-G. Kreul、S. Urban、A. Würflinger1992-06-01Physical Review A
Dielectric studies of a thermotropic-liquid-crystalline substance [pentylcyanobiphenyl (5CB)] under high pressure are reported. Measurements of a complex dielectric permittivity were carried out in the pressure range 0.1--160 MPa, the frequency range 1 kHz--13 MHz, and the temperature range 287--343 K. Static permitti…
Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesMolecular spectroscopy and chirality
Hao Gan、P. C. Hess1992-06-01American Mineralogist
Parallel and perpendicular-polarized Raman, MAS and static 31 P NMR spectra were collected to investigate phosphate speciation in potassium aluminosilicate glasses. Phosphate speciation is critically dependent on the K/(K+Al)(K * ) ratio.
Luminescence Properties of Advanced MaterialsGlass properties and applicationsCrystal Structures and Properties