Materials Literature
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A finite difference (FD) method to calculate the electric field in polluted insulators with asymmetric boundary conditions is proposed. The method is based on neglecting the displacement currents that circulate through the porcelain and through the air, in comparison with the conduction currents that circulate over th…
Abstract Three N,N′-ethylenebis(l-amino acid) ligands have been obtained simultaneously with three α,α′-(1,4-piperazinediyl)bis[(S)-alkanoic acid] and four N,N′-ethylenedipeptide products, by reacting a mixture of l-histidine methyl ester and l-aspartic acid dimethyl ester with glyoxal in the presence of sodium cyanot…
Partial discharge in an artificial air-filled void under superimposed sinusoidal voltages is investigated at room temperature in order to clarify the effect of voltage superposition. The applied voltage waveform is composed of a 60 Hz fundamental sinusoidal wave and a high frequency sinusoidal wave of 300 Hz to 1.2 kH…
Abstract The dispersion of polyethylene and polyropylene in a polypropylene matrix using a co‐rotating twin screw extruder has been investigated. Poymer pairs were selected to study the effect of viscosity ratio, defined as the viscosity of the minor component over that of the matrix, in the range 0.1 to 900. The disp…
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The polarization versus field (P–E) characteristics of modified Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) and Pb(Sc1/2Nb1/2)O3–PbTiO3 (PSN–PT) ceramics has been investigated for compositions close to the morphotropic phase boundary. Investigations were performed for various types of lower valent substituents on the B-site cati…
Bi 2 0 5 Se, orthorhombic, Abm2 (No. 39), a = 11.425(2) , b = 16.244(3) , c = 5.487(2), V= 1018.3 3 ,Z= 8, RoJF) = 0.038, wrefiF 2 ) = 0.100, T= 293 K.
Le concept de stockage developpe par l'ANDRA impose une duree de vie de 1000 ans pour ce surconteneur sachant que le processus majeur de degradation est la corrosion. Pour assurer cette duree de vie, il est necessaire d'evaluer l'epaisseur du metal qui sera perdu par corrosion generalisee. Pour cela, nous avons mene u…
The authors describes CO/sub 2/ reduction/removal possibilities for thermal power plants, which include decarbonization of fuel prior to combustion, combustion in O/sub 2//CO/sub 2/ atmospheres and condensation of CO/sub 2/, and tail-end capture.
Silicon carbide hot‐pressed with aluminum, boron, and carbon as sintering aids (ABC–SiC), was studied by transmission electron microscopy. Both grain‐boundary films and inclusions were prevalent in this material. The present study characterized the inclusions located in triple‐junctions, grain boundaries, and the inte…
The 2,3,7,8,12,13,17,18-octaphenylporphyrinato manganese(III) chloride was prepared and its behaviour as epoxidation catalyst was studied. The role of the phenyl substituents in the ß-pyrrolic positions concerning the stability of the catalyst to the reaction conditions and the efficiency and selectivity of the oxidat…
Electrically conductive rubbers have been prepared by the incorporation of conductive carbon black into ethylene/vinyl acetate (EVA) copolymers, ethylene/propylene/diene monomer (EPDM) terpolymers, and a 50 : 50 EVA–EPDM blend. The electrical and mechanical properties of these composites have been studied. The percola…
Abstract The low temperature (LT) modification of Cs 3 Bi 2 I 9 has been refined to R ( F ) = 0.055 on the basis of X-ray diffraction measurements at T = 130 K from a twin crystal with six fractions connected by 3-fold axis and m -planes symmetry operations. Data were collected on a KM4CCD diffractometer; Mo K α -radi…
The inhibitory effects of pelargonic and capric acid on Microsporum gypseum were examined. Solid and liquid Sabouraud glucose media containing different concentrations of pelargonic and capric acid were separately prepared and inoculated with the suspension of mycelium and spores of M. gypseum and incubated at 25 degr…
Abstract The classic breakage problem is a population‐balance problem using first‐order kinetics and product distribution rules over a multidimensional continuum, mathematically expressed as linear integrodifferential equations for the multiindexed frequency distribution functions of entities. To model the catalytic c…
From the Ag and Cu Auger signals measured on the surface of nanocrystalline Cu/Ag thin bilayers, the temperature dependence of the parameter ω′ for Ag grain-boundary diffusion in Cu (ω′=δkbDb/δsks, where δ and δs are the width of the grain boundary and the segregated layer and kb and ks are the grain-boundary and surf…
Abstract In this study, we present Cu L 3 M 45 M 45 Auger spectra in coincidence with Cu 2p 3 / 2 from the oxidized surface of Cu (i.e. CuO x /Cu) and Cu 2p 3 / 2 lines in coincidence with Auger 1 G and 3 F terms of Cu L 3 VV from Cu. Comparison of the L 3 VV line structures of CuO x /Cu with that of Cu reveals that t…
A method for measuring the spontaneous polarization P s, the switching time, the rotational viscosity γφ, and the d.c. conductivity σ is presented. The possibilities of estimating the azimuthal angle φ0, the dielectric anisotropy δε and the dielectric permittivity ε⊥ in the same experiment are also discussed. It is ex…
Very little data are available regarding the genesis of Inceptisols derived from pyroclastic materials in Taiwan because most of the earlier research focused on Andisols. This study was conducted to explain the formation of Inceptisols derived from the pyroclastic material in northern Taiwan. Three pedons representing…
A new triterpenoid ester 3,29-di-O-(p-methoxy)benzoylmultiflora-8-ene-3 alpha,29-diol-7-one from the seeds of Momordica cochinchinensis Spreng has been isolated. Its structure was elucidated by spectroscopic evidence and confirmed by X-ray crystallography.