Sankarasubbier Narayanan、Gutala Sreekanth1993-01-01Journal of the Chemical Society Faraday Transactions
Nickel oxide supported on high-surface-area magnesia (123 m2 g–1) containing 10 wt.% nickel was prepared in a systematic way by the impregnation method. The problems associated with the reduction of nickel oxide due to formation of an NiO–MgO solid solution are discussed. At 673 K the interaction between NiO and MgO s…
Catalytic Processes in Materials ScienceCatalysis and Oxidation ReactionsMagnesium Oxide Properties and Applications
Yansong Chen1993-01-01Optical Engineering
A 4<i>f</i>-type optical system for performing matrix multiplication is presented. The system consists of a holographic mask and two Fourier lenses. With this system, the inner products of 4 x 8 and 8 x 4 matrices are calculated, yielding results that are in agreement with theoretical values.
Photonic and Optical DevicesLiquid Crystal Research Advancementsgraph theory and CDMA systems
Dey S1993-01-01PubMed
A new rapid air-drying technique for scanning electron microscopy (SEM) with results comparable to critical point drying (CPD) has been developed. In earlier studies a trematode parasite and a fungus were used as test specimens. Here the application of the new method for SEM of some mammalian tissue is described. The…
Electron and X-Ray Spectroscopy TechniquesAerogels and thermal insulation
R. P. Vasquez1993-01-01Surface Science Spectra
XPS measurements of the core levels, including energy losses, and the valence band of a MgO(100) crystal are presented.
Electron and X-Ray Spectroscopy TechniquesElectronic and Structural Properties of OxidesX-ray Diffraction in Crystallography
Michael E. Thomas1993-01-01Optical Engineering
Ultraviolet optical properties near the edge of transparency (just above and below the band gap) of polycrystalline ALON (aluminum oxynitride, Al<sub>23</sub>O<sub>27</sub>N<sub>5</sub>) and spinel are not well characterized. The edge of transparency is commonly found to obey Urbach's rule, and this is the case for si…
Luminescence Properties of Advanced MaterialsGaN-based semiconductor devices and materialsGa2O3 and related materials
Anthony V. Powell1993-01-01Annual Reports Section C (Physical Chemistry)
A. V. Powell, Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 1993, 90, 177 DOI: 10.1039/PC9939000177
Chalcogenide Semiconductor Thin FilmsCrystal Structures and PropertiesNanocluster Synthesis and Applications
C. F. Woensdregt1993-01-01Faraday Discussions
Hartman–Perdok theory enables classification of crystal faces as F, S or K faces. Only F faces should be present on growth forms as they grow slowly according to a layer mechanism. Such a classification can be quantified for ionic crystals by the calculation of attachment energies in electrostatic point-charge models.…
Metallurgical Processes and ThermodynamicsCrystallization and Solubility StudiesMineralogy and Gemology Studies
M. Pompili、C. Mazzetti、M. Libotte 等 4 位作者1993-01-01IEEE Transactions on Electrical Insulation
At present, several definitions of partial discharge inception voltage (PDIV) have been advanced. To establish the value of each of these definitions, four practical electrical insulating fluids are selected, and their PDIV is determined according to three of these different specifications. The results suggest that th…
High voltage insulation and dielectric phenomenaPower Quality and HarmonicsPower Transformer Diagnostics and Insulation
Akimasa Nomura、Jin Takano、Akinobu Toyoda 等 4 位作者1993-01-01NIPPON GOMU KYOKAISHI
部分水素化NBR(HNBR)とメタクリル酸亜鉛(ZDMA)との複合体は, カーボンブラック補強ゴムと比較して高強度(55MPa)が出るのが特徴である. パーオキサイドで架橋を行う工程中で, 平均粒径5μmのZDMAモノマーはin situで重合する. その過程でZDMAは拡散しながら重合し最終的に2nmサイズに分散されたPoly-ZDMA粒子相を形成する. この粒子が凝集して高次構造を形成する. 観察されたモルフォロジーと引張特性との関連性について述べる.
Advanced ceramic materials synthesisFuel Cells and Related MaterialsSilicone and Siloxane Chemistry
J. A. Brooks、John C. Lippold1993-01-01ASM International eBooks
Abstract Austenitic stainless steels exhibit a single-phase, face-centered cubic structure that is maintained over a wide range of temperatures. This article reviews the compositions of standard and nonstandard austenitic stainless steels. It summarizes the important aspects of solidification behavior and microstructu…
Microstructure and Mechanical Properties of SteelsHydrogen embrittlement and corrosion behaviors in metalsWelding Techniques and Residual Stresses
Esther Belin、Didier Mayou1993-01-01Physica Scripta
We present and analyze briefly partial valence and conduction band states distributions of Al 6 Mn and both crystalline and quasicrystalline AlCuFe phases of close nominal composition. Low densities of states and a pseudo-gap are found at the Fermi energy. We discuss the formation of this pseudo-gap as due to the diff…
Quasicrystal Structures and Properties
J. Tao、K.K. Young、N.W. Cheung 等 4 位作者1993-01-01IEEE Transactions on Electron Devices
The reliability with respect to electromigration failure of tungsten and aluminum vias under DC, pulse-DC, and AC stressing has been studied using Kelvin test structures. The results indicate that although W-plug vias can eliminate the step coverage problem, this metallization system is not ideal because the intermeta…
Electronic Packaging and Soldering TechnologiesCopper Interconnects and ReliabilitySemiconductor materials and interfaces
K. R. ADAMS、Raymond Bonnett、Philip J. Burke 等 5 位作者1993-01-01Journal of the Chemical Society Chemical Communications
Cleavage of nickel(II) octaethyl-2,3-dihydroxychlorin 3 with lead tetraacetate gives the novel octaethyl-2,3-secochlorin-2,3-dione system as its nickel(II) complex 4, which on treatment with basecyclisesto a novel homoporphyrinone structure 5; electronic spectra are presented: 4 and 5 are seen as representing chromoph…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Shinichiro Takahashi、Marie‐Louise Saboungi、R. J. Klingler 等 5 位作者1993-01-01Journal of the Chemical Society Faraday Transactions
The room-temperature molten salts formed by combining AlCl3 with 1-ethyl-3-methylimidazolium chloride (EMIC) have been investigated by 27Al and 35Cl NMR spectroscopy at temperatures from 25 to 100 °C. The initial AlCl3 loading was varied from 50 mol%, where AlCl–4 is the major complex ion, to 67 mol%, where Al2Cl–7 is…
Material Dynamics and PropertiesAdvanced NMR Techniques and ApplicationsSolid-state spectroscopy and crystallography
Rafeh Bechara、Antoine Aboukaı̈s、Jean‐Pierre Bonnelle1993-01-01Journal of the Chemical Society Faraday Transactions
The surface changes of a Cu–Al–O catalyst under H2 or CO atmospheres have been followed by X-ray photoelectron spectroscopy (XPS). In both cases, the progressive reduction of copper(II) species in the octahedral and tetrahedral sites to lower oxidation states for temperatures above 250 °C is observed. When the catalys…
Catalytic Processes in Materials ScienceCopper-based nanomaterials and applicationsElectron and X-Ray Spectroscopy Techniques
Hugh Gong、Samrat Mukhopadhyay1993-01-01Journal of the Textile Institute
The general characteristics of eight fabric groups as measured by the KES-F system are described. These fabric groups are divided by fibre content, fabric construction and special finishing treatment. Using silk fabric as a reference, caustic-reduced polyester fabrics exhibit strong silk-like characteristics except in…
Textile materials and evaluations
S. Chakravorti、P. K. Mukherjee1993-01-01IEEE Transactions on Electrical Insulation
HV outdoor insulators are always subjected to pollution of different nature and severity and the performance of a HV insulator under polluted conditions is quite different from that under pollution-free conditions. The present paper is concerned with the field distribution around a post-type insulator for different se…
High voltage insulation and dielectric phenomenaLightning and Electromagnetic PhenomenaAerosol Filtration and Electrostatic Precipitation
Mitsuo Matsudaira、Yi Tan、Yuta KONDO1993-01-01Journal of the Textile Institute
In order to clarify the effects of different fibre cross-sectional shapes on fabric mechanical properties and handle, polyester ‘Shingosen’ fabrics of different fibre cross-sections were investigated using the KES-FB system. The results were discussed by comparing them with typical women's fine dress fabrics and the f…
Dyeing and Modifying Textile FibersTextile materials and evaluationsMechanical Engineering and Vibrations Research
Hidenobu Itoh、Takeshi Tabata、Mikako Kokitsu 等 6 位作者1993-01-01Journal of the Ceramic Society of Japan
A new method for preparing SiO2-Al2O3 gels from aqueous solutions of tetraethoxysilane and aluminum chloride was investigated. Addition of propylene oxide to the solutions promoted gelation reaction, yielding translucent gels. It was found that the 4-coordinated Al incorporated in the framework of the gels was formed…
Mesoporous Materials and CatalysisAerogels and thermal insulationSilicone and Siloxane Chemistry
Raymond Bonnett、Dennis G. Buckley、Tom Burrow 等 6 位作者1993-01-01Journal of Materials Chemistry
Polymer-porphyrin (-phthalocyanine) films required as potential photobactericidal surfaces have been prepared by impregnation (dyeing), by codissolution and casting, and by copolymerisation and casting.
Porphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research StudiesPhotochromic and Fluorescence Chemistry