Materials Literature
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Significant discrepancies were generally reported in the dynamics of BaTiO 3 between results deduced from various experimental techniques. Here dielectric and quasi-elastic light scattering measurements are investigated on high-quality BaTiO 3 crystals. We show that two relaxators have to be introduced below the soft-…
The presence of surface competing cations and pH are expected to have an influence on the cation adsorption-desorption behavior of soils. In this study, we evaluated the adsorption-desorption behavior of K+ in the presence of solution Ca2+ (binary) or in the presence of solution Ca2+ plus NH4 (ternary) and the adsorpt…
Compositional characterization of a solid phase material isolated by extraction from filtered liquid phase diesel fuels is reported. This solid phase material (SMORS) is shown to be the product of reactive fuel constituents and intermediate to the formation of fuel insoluble sludge. The composition of this material ch…
A methodology is reported for defining a class of ferromagnetic oxides, based on theoretical and experimental considerations. Starting from phenomenological superexchange theory, a perovskite oxide with composition La2MnIrO6 was proposed to order ferromagnetically. Self-consistent band-structure calculations are used…
As a computational tool, neural networks are a rapidly emerging technology that can significantly enhance analysis or even provide solutions to a number of very difficult problems; includes an extensive appendix of additional reference materials.
Plasma spraying, originally a surfacing technology used for ceramic coating of metal and nonmetal substrates, is suitable for producing large, full ceramic bodies, such as plates and tubes, in situ to almost the desired dimensions; i.e., conventional methods of designing by molding and casting green bodies followed by…
Four new taxa belonging to the genus Attheya West are described from the west coast of Britain and from the North Sea. Attheya arenicola sp. nov. was found on sandy beaches in southwest Wales, Cornwall and the west coast of Scotland in the U.K., and on the edge of the North Sea at Renesse, Netherlands. A. flexuosa var…
We have used thermodynamic and kinetic techniques to monitor the guanidinium chloride induced (GdmCl-induced) denaturation of N-(5'-phosphoribosyl)anthranilate isomerase from Escherichia coli (ePRAI). Although CD-monitored equilibrium denaturation curves are consistent with cooperative unfolding of the protein centere…
Ultrafine particles of RuO 2 ‐ SnO 2 binary oxides have been prepared by a sol‐gel process consisting of hydrolysis and condensation of metal alkoxide alcoholic solutions. The binary oxides calcined at 450°C were composed of two rutile‐type oxide phases: RuO 2 and ( Ru , Sn ) O 2 . The Ru metallic phase also was found…
Abstract Oxidative coupling of methane was conducted by using membrane reactors. The nonporous membrane film that consisted of PbO modified by alkaline or alkaline earth compound was supported on porous SiO 2 ‐Al 2 O 3 tube. Higher hydrocarbons were successfully synthesized with high selectivity (about 90%). A kinetic…
Photo-oxidation of some representative spiropyrans and spiro-oxazines does not seem to involve singlet oxygen O2 (1 Δg). The photochromes rather behave, in the spiro and merocyanine form, as O2 (1 Δg) quenchers. Only a methoxy-nitro benzopyran derivative was found to promote formation of singlet oxygen. Superoxide ani…
Magnetization measurements, reported for ${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{4}$ in the compositional range 0\ensuremath{\le}x0.04, were used to determine magnetocrystalline anisotropy constants as a function of x and temperature. Magnetic measurements were pe…
The dielectric response of a number of homogeneously aligned FLC cells has been investigated. Several relaxation processes exhibiting behaviour with different relaxation times are found for the first time. These are identified with the structure of the smectic layers in the cell and the parameters of the FLC mixtures.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDip in G''(.omega.) of Polymer Melts and Semidilute SolutionsRony GranekCite this: Langmuir 1994, 10, 5, 1627–1629Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/doi/10.1021/la00017a051https:/…
This paper presents information on pedogenic processes, weathering status and geochemical evolution of ultramafic soils at three areas in southwestern British Columbia characterized by climatic conditions ranging from relatively wet–cool to relatively dry–cool. The soils of the Coquihalla serpentine belt have Podzolic…
A new magnetostrictive force sensor is presented and its operation is verified experimentally. The sensor has a single excitation coil and a single detection coil, which utilize the magnetostrictive effect. The cores of the coils function as ‘‘spring elements’’ of the sensor, and are linked together by rigid end plate…
A type of intrinsic luminescence in crystals has been revealed. The excitation threshold of well-known fast intrinsic luminescence of CsI (300 nm band) has been obtained from the excitation spectrum measured in the photon-energy range 5--125 eV at 300 K using synchrotron radiation. The excitation starts from an energy…
A sample preparation technique, suitable for x-ray-absorption measurements of liquid and supercooled metals is described. The method is based on an application of the emulsion technique, consisting in a dispersion of micrometric droplets in an inert rigid matrix. It has been applied to Hg and Ga resulting in a very fi…
Abstract Concentration‐dependent ternary interaction parameters are experimentally determined for the polyamide homopolymers, Nylon‐6, ‐66, ‐610, and for the Nylon‐66/610/6 terpolymer in formic acid‐water systems. The binodal envelope, the tie lines, and the crystallization isotherms at 25°C are given for each of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Properties of Two New Vanadium(III) Phosphates: VPO4.cntdot.H2O and V1.23(PO4)(OH)0.69(H2O)0.31.cntdot.0.33H2OJ. T. Vaughey, William T. A. Harrison, Allan J. Jacobson, David P. Goshorn, and Jack W. JohnsonCite this: Inorg. Chem. 1994, 33, 11, 2481–2…