Materials Literature
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A low cost processing technique called reaction forming for the fabrication of near-net and complex shaped components of silicon carbide based ceramics and composites is presented. This process consists of the production of a microporous carbon preform and subsequent infiltration with liquid silicon or silicon-refract…
A highly unusual electric response of the dislocations and the impurity dipoles in KNbO3 single crystals has been found. The etch pits representing these defects move in the structure carrying these defects with them. This shows that the defects have associated with them structural units that are orders of magnitude l…
Good yield synthesis of the potassium salts of four new interrelated : olyoxometalates, [Co3+W11O39]9-(I), [Co2+W11V4+O4]8-(II), [Co2+W11V5+O40]7-(III), and [Co3+W11V5+O40]6-(IV), are reported. The title compounds have been characterized by IR and UV-Vis.-NIR spectroscopies, cyclic voltammetry and magnetic measurement…
<div class="htmlview paragraph">When oxygen for propulsion and life support needs is extracted from Martian resources, significant savings in launch mass and costs can be attained for both manned and unmanned missions. One method involves oxygen production from the carbon dioxide rich Martian atmosphere using so…
Abstract Crystalline LaNi5 powder was synthesized by mechanical alloying of constituent metals preceding annealing at lower than a melting point of the alloy. The structure of the sample as mechanically alloyed was amorphous. After two-step heat treatments at 723 K in a stream of hydrogen and at 1273 K in helium, the…
Keywords PARSONS BRINCKERHOFF, BABSON COLLEGE WELLESLEY SUBGRADE, REACTIONS, ESTIMATING, COEFFICIENTS, PLANE, STRAIN, CONDITIONS, METHODS, FINITE ELEMENTS, ANALYSIS, BEAMS, SLABS, LOADED, SURFACES, HOMOGENEOUS, ELASTIC, SOILS, LAYERS, DESIGN, CUT AND COVER, TUNNELS, MODIFIED, FOUNDATIONS, MODULUS, RATIOS, STIFFNESS, T…
A number of polyurethanes were synthesized by reacting castor oil with isophorone diisocyanate while varying the NCO/OH ratio. All these polyurethanes were reacted with such acrylic monomers as acrylamide and methacrylamide by using ethylene glycol dimethacrylate as a crosslinker and benzoyl peroxide as the initiator.…
Correction factors for calculating maximum mesh and step voltages associated with grid and combined grid-multiple rod ground electrodes are defined and calculated for a wide set of ground electrodes and various two-layer soil structures. The results obtained are presented as graphs appropriate for a straightforward pr…
Abstract Secondary fluorescence induced by photoelectric absorption of x‐rays generated by an electron beam can occur when the characteristic x‐ray energy of material “A” exceeds the critical excitation energy of material “B.” An expression is developed to calculate secondary fluorescence across a planar boundary from…
As part of a study to develop optimum softening treatments for high chromium irons, to enable efficient tool machining of cast wear parts, alloys containing 2.5%C, 25%Cr and 0–2.5%Mo have been annealed at temperatures between 750 and 950°C. As for previous work on 19%Cr irons, the most effective annealing treatment to…
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…