Raymond Weiss、Jean Fischer、V. Bulach 等 4 位作者2002-05-01Comptes Rendus Chimie
The chloroiron(III) complexes of the partially peripherally crowded 2,3-diethyl-2,3,12,13-tetraethyl-, 2,3,7,8-tetraethyl-, and 2,3,7,8,12,13-hexaethyl-5,10,15,20-tetraphenylporphyrins have been synthesised and their X-ray structures have been determined. The porphyrins present in these molecules are non-planar and as…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Holger Becker、H. Vogel2002-05-01Chemical Engineering & Technology
For the safe and trouble-free operation of a manufacturing plant and the safe storage of acrylic, as well as methacrylic monomers, it is important to know the polymerization stability as a function of the process parameters (temperature, oxygen concentration, and impurities, e.g., metal ions). Contamination with metal…
Cultural Heritage Materials AnalysisPolymer Science and PVC
Ximing Ding、Hui Zhu、Huijun Xu 等 4 位作者2002-05-01Journal of Porphyrins and Phthalocyanines
A novel asymmetrically substituted amphiphilic phthalocyanine, 1,4-di(2-hydroxyethoxyl)-8,9,16,17,23,24-hexapentyloxylphthalocyaninozinc ( asy - PcZn ), was synthesized. It can be deposited as well-ordered LB films. Significant structural changes of the films were observed by UV-vis absorption spectra and low-angle X-…
Porphyrin and Phthalocyanine ChemistryAnalytical Chemistry and SensorsPhotochromic and Fluorescence Chemistry
C. Laquerbe、Didier Ducret、A. Ballanger 等 6 位作者2002-05-01Fusion Science & Technology
CEA/Valduc has developed a Thermal Cycling Absorption Process (TCAP) experimental device dedicated to the study of the separation of hydrogen isotopes and particularly to the recovery of tritium from low concentrated mixtures (tritium molar fraction < 6%). Simultaneously an original and efficient dynamic simulation to…
Fusion materials and technologiesParticle accelerators and beam dynamicsMuon and positron interactions and applications
K. Stephan、M. Hackenberger、D. Kießling 等 5 位作者2002-05-01Chemical Engineering & Technology
Thermoanalytical measurements (DTG-DTA-MS), X-ray diffraction (XRD), temperature-programmed reduction (TPR), redox titration and X-ray photoelectron spectroscopy (XPS) were used to characterize A1–xSrxMnO3 perovskite catalysts (A = La, Nd, Pr, Di [didymium]). The catalyst samples were investigated before and after int…
Catalytic Processes in Materials ScienceMagnetic and transport properties of perovskites and related materialsCatalysis and Oxidation Reactions
ESMOL Subcommittee2002-05-01IEEE Power Engineering Review
This paper deals with the matters that impact the dielectric status of porcelain and glass insulators in a string containing broken and/or defective units that will be exposed to switching overvoltage. Flashover voltages are shown to depend on the position and number of defective units in the string. Complete understa…
High voltage insulation and dielectric phenomenaPower Transformer Diagnostics and InsulationElectrical Fault Detection and Protection
Hideyuki Okumura、F. Zhang、G. C. Hadjipanayis2002-05-01Journal of Applied Physics
The magnetic and structural properties of LaCo5-based LaxCo100−x (x=17–22) alloys have been studied in powders synthesized by mechanical milling and subsequent annealing. A record high coercivity (over 1.7 T) with a Mr/Ms ratio about 0.7 (measured at room temperature) has been obtained in La22Co78 powders. Their micro…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsMagnetic Properties of Alloys
R. Beyreuther、Harald Brünig、Roland Vogel2002-05-01International Polymer Processing
Abstract The mechanical properties of hybrid (commingled) yarn based reinforced thermoplastics depend on many parameters of the fiber components as well as of the different technological conditions during the commingling and the hot press molding. Among the fiber parameters the diameter ratio of the matrix and the rei…
Textile materials and evaluationsFiber-reinforced polymer compositesStructural Analysis and Optimization
Deli Luo、Chunlei Shen、Deying Meng2002-05-01Fusion Science & Technology
The influence of temperature and gas composition on hydrogen isotope separation factors of membrane cascade with reflux ratio of 0.9998 and different palladium alloy membranes were studied. Separation factors for H-D mixture with different palladium alloy membranes varies from 1.31 to 1.42 at different temperatures, a…
Fusion materials and technologiesNuclear Materials and PropertiesChemical Synthesis and Characterization
L. K. Heung2002-05-01Fusion Science & Technology
Metal hydrides offer safe, compact and efficient ways to process tritium in areas including storage, pumping, compression, transportation and purification. Westinghouse at Savannah River Site in USA has developed and implemented metal hydride based technology for various tritium applications over the past 20 years. Th…
Fusion materials and technologiesHydrogen Storage and MaterialsAmmonia Synthesis and Nitrogen Reduction
T. Tanabe、K. Miyasaka、M. Rubel 等 4 位作者2002-05-01Fusion Science & Technology
In order to investigate tritium behavior in tokamak, we have measured surface distributions of deuterium and tritium on graphite limiter tiles used in TEXTOR under D-D operation by means of an ion beam analysis and tritium imaging plate technique, respectively.It was found that both distributions were quite different,…
Magnetic confinement fusion researchFusion materials and technologiesPlasma Diagnostics and Applications
V. A. Stephanovich、M. D. Glinchuk、B. Hilczer 等 4 位作者2002-05-01Physics of the Solid State
The relaxation time distribution function F (τ) is calculated in the framework of the random-field theory. The function F (τ) is expressed through the distribution function f ( E ) of a random electric field E with due regard for the derived dependence of the relaxation time τ on the electric field. The distribution f…
Ferroelectric and Piezoelectric MaterialsMaterial Dynamics and PropertiesGlass properties and applications
O. M. Sreseli、D. N. Goryachev、V. Yu. Osipov 等 8 位作者2002-05-01Semiconductors
Porous silicon layers with introduced carbon-containing substances (fullerenes, ultradisperse diamond, carbohydrates) have been studied. It was found that high-temperature annealing of such layers in a hydrogen atmosphere leads to substantial transformation of the photoluminescence spectra. It is assumed that this res…
Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
F. Zhang、Deng‐Ke Yang2002-05-01SID Symposium Digest of Technical Papers
Abstract We have developed two types of polymer stabilized cholesteric dichroic dye displays. In the first type, an anisotropic polymer network perpendicular to the cell surface was formed by photo‐polymerization in the homeotropic texture in the presence of an electric field. The polymer network enhanced the hysteres…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsElectrowetting and Microfluidic Technologies
U. Besserer、R.‐D. Penzhorn、R. Brandt2002-05-01Fusion Science & Technology
The Tritium Storage facility of the Tritium Laboratory Karlsruhe (TLK), was recently upgraded by four additional uranium beds and one containing ZrCo. Now it is possible to compare under very similar conditions the sorption/desorption properties of uranium and those of ZrCo. To test the adequacy of ZrCo for routine, t…
Fusion materials and technologiesNuclear reactor physics and engineeringNuclear Materials and Properties
V. Sauvant-Moynot、Sébastien Duval、Jacky Grenier2002-05-01Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
To date, the high temperatures (above 140°C) met in some fields in, e. g. , the North Sea, impose the development of innovative corrosion protecting coatings. Thermostable products have been developed from combining a high-Tg thermoplastic and epoxyamine monomers (the latter reducing the viscosity of the former to all…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityStructural Integrity and Reliability Analysis
Meiling Sun、Michael Pecht、D. F. Barbe2002-05-01IEEE Transactions on Semiconductor Manufacturing
Increasing resistance and RC time delay induced by an oxidation in a copper line during its lifetime may limit copper-based metallization for technologies with critical dimension. Based on the mechanisms of resistance, constriction resistance and material diffusion, two dynamic models to access lifetime behavior of re…
Electronic Packaging and Soldering TechnologiesSemiconductor materials and devicesCopper Interconnects and Reliability
Wei‐Lin Dai、Yi Dong、Yong Cao 等 7 位作者2002-05-01Journal of Raman Spectroscopy
Abstract In situ Raman spectroscopy was used to study the interaction of iodine‐modified electrolytic silver with oxygen and methanol at atmospheric pressure at temperatures between 25 and 500°C. It is shown that the presence of iodine inhibits the formation of surface oxygen species corresponding to deep oxidation an…
Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
Tian Jun Rong、Xiao Huang、Shi Wei Wang 等 5 位作者2002-05-01Journal of the American Ceramic Society
MgO (10.4 mol%)‐doped ZrO 2 powder, which was prepared by coprecipitation and calcination at 750°C, was leached and milled, respectively. The powders were characterized by Auger electron scanning microprobe and XRD technologies. Only the 2.3 mol% MgO was soluble in ZrO 2 ; it stabilized ZrO 2 as the metastable tetrago…
Advanced ceramic materials synthesisAdvanced materials and compositesNuclear materials and radiation effects
S. J. Shitole、K. B. Saraf2002-05-01Crystal Research and Technology
Single crystals of calcium iodate, monohydrate [Ca(IO3)2, H2O] have been grown by gel technique. Prismatic, prismatic pyramidal, needle shaped and hopper crystals were obtained. These crystals were also grown by doping impurities such as copper and iron. Kinetics of growth parameters was investigated. Structural analy…
Crystallization and Solubility Studies