Materials Literature
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A long-standing puzzle in heterogeneous catalysis, CO oxidation on a Ru(0001) surface under high oxygen pressure, was clarified recently by Over et al. [Science 287, 1474 (2000)], who obtained experimental evidence that the active phase is RuO2(110) when the reaction is operated at an elevated temperature. To find mic…
Reliable methods of patterning thin zeolite films on various supports, such as the versatile photochemical method introduced here, will lead to a breakthrough in applications, e.g., as combinatorial catalysts. The Figure shows an SEM image of a glass plate patterned directly with a continuous film of the zeolite ZSM-5…
The thermal expansion of La 0.9 Sr 0.1 Cr 1‐ x M x O 3 (M = Mg, Al, Ti, Mn, Fe, Co, Ni; 0 ≤ x ≤ 0.1) perovskites has been studied in oxidizing and reducing atmospheres in the temperature range from 50° to 1000°C. Cobalt doping of La 0.9 Sr 0.1 CrO 3 was an effective way of increasing the average linear thermal expansi…
Retention characteristics of metal-ferroelectric-insulator-semiconductor (MFIS) structures have been studied theoretically by considering effects of charge injections derived from the difference between leakage current densities in the ferroelectric and insulator layers. The calculated curves for time-dependent capaci…
The film thickness dependence of the ferroelectricity of c-axis-oriented epitaxially grown Bi4Ti3O12 thin films was investigated. The c-axis-oriented Bi4Ti3O12 films with thicknesses from 35 to 400 nm were epitaxially grown on (100)CaRuO3//(100)SrTiO3 substrates by metalorganic chemical vapor deposition. The dielectri…
Article Refinement of the crystal structure of potassium dideuterium phosphate, KD2PO4 was published on April 1, 2001 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 216, issue 1-4).
RgtfF) = 0.023, wR Kf (F 2 ) = 0.054, T= 153 K.
Abstract The 5‐parameter Morse potential of interaction between carbon and the nickel surface was constructed. We studied the adsorption and vibration of carbon atom on Ni(100), Ni(110) and Ni(111) single crystal low index surfaces and obtained the data of adsorption sites, adsorption geometry, binding energy and eige…
The electron-spin resonance (ESR) spectra of cluster polyoxometalate systems—a finely dispersed powder of the (NH 4 ) 6 [Mo 7 O 24 ]-citrie acid complex, molybdic acid, and molybdenum(VI) oxide—are investigated. The initial samples are colored under exposure to ultraviolet (UV) irradiation (photochromic effect) and th…
Among many nonlinear optical (NLO) crystals, Sr 2 Be 2 B 2 O 7 (SBBO) and structurally related crystals is promising for the generation of UV and vacuum-UV (VUV) light. However, high viscosity, volatility and the platy growth habit have limited the growth of thick crystals for actual NLO applications. The growth of th…
The biochemical inhibition by Cu2+ on eight phylogenetically and biochemically different phosphofructokinases (PFKs) was investigated. The enzymes screened included representatives from thermophilic and mesophilic bacteria, a hyperthermophilic archaeon and a eukaryote, covering all three phosphoryl donor subtypes (ATP…
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.