Materials Literature
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The AC-behavior of a hydrophilic and a hydrophobic porcelain post insulator is studied during four different rain conditions by measuring the electric field distribution, resistive and capacitive leakage currents and UV-photography of the discharge activity. The results are in agreement with each other and show resist…
Electrodeposited tungsten trioxide films show fast electrochromic response both in aqueous and in nonaqueous solutions. The values of in the tungsten bronzes, , were determined by using a chronopotentiometric technique combined with UV/Vis spectroscopic analysis. The effect of double‐layer charging was discussed. A fi…
Scanning electron microscopy, atomic force microscopy, and Raman spectroscopy were used to characterize the microstructure of photoluminescent porous silicon (PS) layers formed by the anodic etching (HF:H2O:ethanol), at various current densities, of p-type (100) silicon wafers possessing resistivity in the range 1–2 Ω…
Abstract Mit CO 2 ‐LASER‐Technik wurden bei Temperaturen oberhalb 3 000°C Einkristalle einer Hochtemperaturform von TiO (HTiO) dargestellt. Sie kristallisieren mit einer an Oxiden des zweiwertigen Titans bisher nicht beobachteten Kristallstruktur, isotyp zu Wolframcarbid, mit Ti 2+ in trigonal prismatischer Sauerstof…
We present our model for transport and deposition in features for situations in which intermolecular collisions dominate the species transport. Species transport in this ‘‘low’’-Knudsen-number regime is modeled using continuum diffusion. Our model allows both homogeneous reactions and heterogeneous (surface) reactions…
We present linearized augmented-plane-wave calculations for FeCu fcc and bcc metastable phases using the local-density approximation (LDA) as well as the local-spin-density approximation (LSDA). The nonpolarized density of states calculated within the framework of LDA together with the reformulated Stoner theory provi…
Abstract An experimental and numerical analysis of tension tests in the Hopkinson bar is made to assess the suitability of this method to characterize materials in tensile conditions at strain rates about 1000/s. The stress and strain fields that appear in the specimen are analyzed by the finite element method. This m…
Novel AlN‐based ceramic matrix composites were produced using a two‐step infiltration and reaction process. Molten Al alloy was infiltrated without pressure into preforms containing Si 3 N 4 particles (mixed α and β phases). The resultant composites were heat‐treated, causing hard phases (AlN and Si) to form by reacti…
Liquid crystals containing “open” analogues of the mesomorphic amide 1,4,7‐triazacyclononane, i.e., 3,4‐bis(alkoxy)‐ benzoyl substituted diethylenetriamine, are reported, showing that the closed‐ring structure of the central core is not essential for mesomorphism in these compounds. The Figure shows the pronounced pse…
Various attempts have been made to develop models for predicting the development of damage in metals and alloys due to pitting corrosion. These models may be divided into two classes: the empirical approach which employs extreme value statistics, and the deterministic approach based on perceived mechanisms for nucleat…
Recent developments of the IMPAX system for automated crystallization are presented. A five-channel microtip has been introduced into the system thereby providing an extra degree of freedom for carrying out experiments. A new mouse-driven program for screening has been introduced, which creates a much wider scope for…
Analyzing the normal-state magnetic susceptibility \ensuremath{\chi} for ${\mathrm{TlSr}}_{2}$(${\mathrm{Lu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$)${\mathrm{Cu}}_{2}$${\mathrm{O}}_{\mathit{y}}$, whose carrier density covers the entire range from the underdoped to the overdoped regime, as a…
In recent work, Oswald and collaborators describe the thermodynamical phase diagrams of a large pitch cholesteric, confined between glass plates with homeotropic alignment conditions, in the neighbourhood of the critical confinement and in the presence of an AC electric field. In the case of a negative dielectric anis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Antimony(V) Octaethylporphyrins That Contain a .sigma.-Bonded Element-Carbon BondK. Akiba, Yoshitaka Onzuka, Makoto Itagaki, Hiroshi Hirota, and Yohsuke YamamotoCite this: Organometallics 1994, 13, 7, 2800–2803Publication Date (Print):July 1, 1994Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesorption of Perylene from Combustion, NaCl, and Carbon ParticlesDietmar. Steiner and Heinz K. BurtscherCite this: Environ. Sci. Technol. 1994, 28, 7, 1254–1259Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994ht…
The thicknesses of thin oxide films grown on silicon in oxygen were measured by transmission electron microscopy (TEM), ellipsometry, and profilometry. For films thicker than about 30 nm the thicknesses measured with these three techniques were the same within experimental error; the ellipsometric thicknesses were cal…
The viscoelastic behavior of concentrated dispersions of adhesive hard spheres was investigated. By changing the temperature, the interaction potential of the particles was varied from a hard sphere repulsion to a strong attraction. Using torsion resonators and a nickel tube resonator the complex viscosity was measure…
A substantial amount of research on acoustic scattering by underwater bubbles is based on the theory of incoherent scattering. More recent work, devoted to much denser bubble assemblies, has instead used effective-media formulations that presuppose coherent effects. Here the mutual relationship between the two approac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Pressure Synthesis of Aliphatic Polyimides via Salt Monomers Composed of Aliphatic Diamines and Oxydiphthalic AcidKazuo Itoya, Yoshihiro Kumagai, Masa-aki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1994, 27, 15, 4101–4105Publication Date (Print):July 1, 1994Publ…
The effects of fiber volume fraction on composite mechaniacl properties were examined in SiC‐fiber‐reinforced Si 3 N 4 composites fabricated in our laboratories. Fiber volume fraction was found to have significant effects on important composite properties including failure mode, ultimate strength, matrix‐cracking stre…