Materials Literature
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A new technique for measuring the thermal conductivity of metallic materials during liquid/solid phase transformation is proposed and applied to the determination of the thermal diffusivity and thermal conductivity of Wood's metal (Bi, 48%; Pb, 26%; Cd, 13%; Sn, 13%) at the melting point. The technique incorporates me…
The dynamics of the relaxation processes in a glass-forming system, B2O3, was investigated by means of 11B nuclear magnetic resonance (NMR). Using a homemade high temperature NMR probe, we collected NMR data over a wide temperature range from room temperature to 1200 °C. The NMR data were interpreted in terms of a Fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-Resolved X-ray Diffraction Study of the Temperature Dependence of the Structure of Magnesium Stearate MultilayersG. Rapp, M. H. J. Koch, U. Hoehne, Y. Lvov, and H. MoehwaldCite this: Langmuir 1995, 11, 7, 2348–2351Publication Date (Print):July 1, 1995Publication History…
Passive layers have been formed on Fe/Al alloys under well‐controlled electrochemical conditions. These layers were studied by x‐ray photoelectron spectroscopy (XPS) and ion scattering spectroscopy (ISS) without any exposure to the laboratory atmosphere during the specimen transfer from the electrolyte to the ultrahig…
The removal or organic additives which are used to assemble ceramic particles into pre-determined shapes, by diffusion during thermolysis, is modelled taking into account the simultaneous creation of surface porosity and distributed porosity in the ceramic body. A flat-plate geometry is considered and the model is use…
The construction of the γ surface requires the application of mechanical constraints in order that the energy of non-equilibrium fault configurations can be calculated. The choice of mechanical constraints is not unique and it is shown that γ surfaces constructed using different schemes can differ significantly. The m…
The underpaint corrosion of zinc‐coated steel exposed to chloride containing solutions was studied by Raman spectroscopy; the selection of an appropriate resin (without fluorescence) allows us to perform the analysis directly through the paint. The influence of a conversion layer (chromatation or phosphatation) was in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR and Electron Microscopic Investigation of Polymerized Coatings Prepared from Methacrylate-Functionalized Silica in an Acrylic Monomer MatrixLarry N. Lewis, Thomas A. Early, Michael Larsen, Elizabeth A. Williams, and James C. GrandeCite this: Chem. Mater. 1995, 7, 7, 1369…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle-Liquid Mass Transfer in Three-Phase Mechanically Agitated Contactors: Power Law FluidsKamlesh B. Kushalkar and V. G. PangarkarCite this: Ind. Eng. Chem. Res. 1995, 34, 7, 2485–2492Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Pub…
The quasi-TEM approximation for multiconductor lines embedded in inhomogeneous bi-isotropic media is developed. It is shown that in the quasi-TEM limit a multiconductor line in bi-isotropic media can be represented by a coupled set of nonreciprocal and nonsymmetric circuit transmission lines. The effect on the circuit…
Eight species of halophilic Archaea were tested for the presence of isocitrate lyase activity. High activities (up to 100 nmol min−1 mg protein−1) were detected in Haloferax mediterranei and Haloferax volcanii when grown in medium containing acetate as the principal carbon source. Little activity was found in represen…
Two novel glass compositions aimed at improving the quantum efficiency and gain of the 1.3 mu m praseodymium-doped fibre amplifier (PDFA) were developed and investigated. The two glasses were compositions based on cadmium halide and gallium fluoride. Both bulk glass samples and core-clad fibre structures were fabricat…
D. J. Whittaker, G. S. Smith, R. C. Gardner; Three cDNAs Encoding S-Adenosyl-L-Methionine Synthetase from Actinidia chinensis, Plant Physiology, Volume 108
We investigate the dependence of the average interface field on the inversion and depletion charge density through the use of a zero-temperature Green’s function formalism for the evaluation of the broadening of the electronic states and conductivity. Various models for the surface-roughness autocovariance function ex…
Spectroscopic absorption and emission measurements have been used to study laser deposition of YBCO films. They show that >95% of the monatomic Y and Ba initially ablated from the target undergo gas-phase chemical combination before film deposition. In contrast, considerable monatomic Cu persists into the deposition r…
A transition matrix method is commonly used to deal with the problems of either plane-wave scattering from or the Green's function of a generalized anisotropic medium. This method, although rigorous analytically, introduces numerical breakdown, when the layers are electrically thick and the waves are evanescent. A var…
In our previous paper [Phys. Rev. B 44, 2046 (1991)], results of high-resolution transmission electron microscopy (HRTEM) at each stage of the complicated hysteretic phase transformation of 1T-${\mathrm{TaS}}_{2}$ are described. Here, on warming from the commensurate (C) phase to the incommensurate (IC) phase, the tri…
A lattice-dynamics approach to acoustic emission during plastic deformation of crystals is proposed. First the dynamics of a dislocation interacting with transverse acoustic waves is investigated on the basis of a microscopic Frenkel–Kontorova model in which the rigidity of the substrate is relaxed. It is shown that t…
The functionalization of amphiphilic quaternary ammonium salts with properly chosen interacting endgroups constitutes an easy way to produce novel liquid crystal-line materials with diversified physical properties.1 Additional cyano endgroups introduce dipole-dipole interactions susceptible to strongly affect the liqu…
The preparation of 4′-alkyl- and 4′-alkoxy-4-cyano-3-fluorobiphenyls by four different procedures is described and discussed; the best method involves palladium(0)-catalysed coupling of arylboronic acids and 4-bromo-(or 4-iodo-)-2-fluorobenzonitrile. The effects on transition temperatures of fluoro substitution ortho…