Results 151 to 160 of about 2,828,055 (204)

Phase-composition and selectivity

Applied Catalysis, 1990
It is commonly accepted in propene oxidation on copper oxide that it is partially oxidized to acrolein on Cu2O but totally oxidized on CuO. It is therefore the reaction of choice to illustrate the usefulness of solid electrolyte potentiometry in the case of oxidic catalysts.
Hans-Hubert Hildenbrand, Hans-Günther Lintz   +1 more
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Phase composition of asphaltenes

Journal of Thermal Analysis and Calorimetry, 2013
The phase composition of asphaltenes taken from oils of Romashskino field (Russia) was studied with calorimetry. It was found that in asphaltenes there are ordered amorphous phases which break in the temperature ranges 70–130 and 130–170 °C. Polarization microscopy data show that the liquid crystal phase appears at temperatures from 180 to 190 °C ...
Yulia Muratova Ganeeva, Tatiana Nicolaevna Yusupova, Gennady Vasil’evich Romanov, Natalia Yurievna Bashkirtseva   +3 more
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Interpenetrating Phase Composites

Journal of the American Ceramic Society, 1992
An assessment of the processing and properties of interpenetrating phase composites is presented. Such materials, defined as multiphase composites in which each phase is topologically interconnected throughout the micro‐structure, were the subject of a DOE Basic Energy Sciences sponsored workshop on research needs and opportunities held in July 1989 in
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Nonstoichiometric Phases—Composition, Properties and Phase Transitions

2017
Nonstoichiometric phases constitute a large family of technologically important materials. Among them, the inorganic materials whose variable stoichiometry of some components originates from their exchange with surrounding atmosphere represent particular thermodynamic systems referred to a partly open system.
David Sedmidubský, Pavel Holba
openaire   +1 more source

Phase composition of TiO2-coated ZrO2/Si3N4 composite

Journal of the European Ceramic Society, 1999
Abstract The effect of TiO 2 coating on the phase composition of ZrO 2 /Si 3 N 4 composites was investigated both with pressureless-sintered samples and with hot-pressed ones. The formation of ZrN could be suppressed by increasing in the amount of TiO 2 coated on 3Y–ZrO 2 .
H.X. Li, J.K. Yu, K. Hiragushi, Y. Kayano, Y. Mizota   +4 more
openaire   +1 more source

Phase Composition and Structure of Aluminum – Coating Composite

Glass and Ceramics, 2004
Low-melting enamel coatings for household aluminum kitchenware are synthesized. The possibility of formation of low-melting glasses in the system R2O – Al2O3 – B2O3 – TiO2 – P2O5 is studied. An optimum glass matrix composition with a decreased firing temperature (580°C) is selected.
E. A. Shkurakova, E. A. Yatsenko
openaire   +1 more source

Phase Composition of Commercial "Ammonium Carbonate"

Science, 1963
A unique crystalline phase was the sole constituent in newly opened containers of commercial reagent-grade "ammonium carbonate." The chemical composition, optical constants, x-ray powder diffraction pattern, infrared absorption spectrum, and density indicate a double salt, ammonium bicarbonate-carbamate (NH 4 HCO
C B, Sclar, L C, Carrison
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Composite phase and phase-based Gabor element aggregation

Proceedings., International Conference on Image Processing, 2002
This paper describes how the phase, obtained by Gabor filtering an image, can be used to aggregate related Gabor elements (simple features identified by peaks in the Gabor magnitude). This phase-based feature grouping simplifies the perennial problem of target/background segmentation because we need to only determine if the aggregate feature is target ...
R.N. Braithwaite, B. Bhanu
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A coupling concept for two‐phase compositional porous‐medium and single‐phase compositional free flow

Water Resources Research, 2011
Domains composed of a porous part and an adjacent free‐flow region are of special interest in many fields of application. So far, the coupling of free flow with porous‐media flow has been considered only for single‐phase systems. Here we extend this classical concept to two‐component nonisothermal flow with two phases inside the porous medium and one ...
Mosthaf, K., Baber, B., Flemisch, B., Helmig, R., Leijnse, A., Rybak, I., Wohlmuth, B.   +6 more
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Optics of two-phase composites

Vibrational Spectroscopy, 1990
Abstract The optical behaviour of composites, being inhomogeneous on a length scale much smaller than the wavelength of light, can be described by an effective dielectric constant. This depends on the dielectric constants of the constituents and on the topology of the system.
M. Evenschor, P. Grosse, W. Theiss
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