Materials Literature
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In South Africa and in the rest of the world, the two mica minerals that have the most important commercial value are muscovite and vermiculite. Muscovite has been making a comparatively small but steady contribution to South Africa's mineral exports since about 1960. Vermiculite mining and concentration were started…
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Abstract The past decade has seen greatly increased interest in ceramic materials with special combinations of properties. Their hardness, high resistance to abrasive and erosive wear, and their good corrosion resistance when used under extreme mechanical and thermal conditions have made ceramics increasingly attracti…
The authors discuss corona and breakdown in compressed sulfur hexafluoride (SF/sub 6/) gas-insulated transmission line (GITL) equipment due to free conducting particles. For particle-contaminated conditions, dynamic models of particle movement and particle-initiated corona and breakdown have been developed. Moreover,…
Ultrasonic and viscoelastic relaxation spectra were determined for a mixture of acetamide and calcium nitrate [X (acetamide)= 0.7644]. Retardation phenomena are present in the viscoelastic relaxation spectrum and they seem to be affected by the type of container used; the ultrasonic spectrum is due to a chemical equil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic, volumetric, and viscometric studies of tetracycline and its allied compoundJ. D. Pandey, A. Shukla, K. Misra, and R. D. RaiCite this: J. Chem. Eng. Data 1989, 34, 1, 29–31Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Publis…
Accelerated electrochemical tests with cyclic immersions and emersions and electrode potential measurements during the periods of immersion help to assess the corrosion behavior of metallic material under different climatic conditions and to understand the atmospheric corrosion or passivation mechanism. Results of bot…
A universal analytic formula is given for the total cross sections of single-electron capture by multiply-charged ions colliding with H, H 2 or He. Values of constants in the formula have been determined by least-squares fit to experimental data collected from the literature. The formula is applicable to ions of almos…
Deuterium NMR studies have been performed in LiCl\ensuremath{\cdot}R(${\mathrm{D}}_{2}$O) (mole fraction R=4 and 7, respectively) over the temperature range of 15 to 170 K, i.e., below and above the glass transition temperature (${T}_{g}$\ensuremath{\simeq}145 K). The motional mechanism of the four ${\mathrm{D}}_{2}$O…
Two-electron and four-electron reduction of dioxygen by an acid-stable NADH model compound, 10-methylacridan, occurs efficiently when catalysed by metalloporphyrins and by both metalloporphyrins and iodide ion in the presence of perchloric acid in acetonitrile, respectively.
The cubic system of the space group denoted by Oh5–Fm3m with the lattice constant of a=0.5833±0.0003 nm has been found more feasible for the crystal structure of superionic phase of Cu2Se (α-Cu2Se) at 473 K using the usual powder X-ray diffraction method. The present conclusion has also been supported by the anomalous…
Microstructural and property assessments have been undertaken on spray deposited M2 high speed steel in the as deposited condition and after hot forging. The response of the material to hardening treatment has also been studied. The microstructure of the as deposited material showed a small grain size with a cellular…
At current densities large in magnitude and also large compared to the exchange current density, a conducting disk in an insulating plane has a very nonuniform current distribution across the surface. The current distribution near the center is governed predominantly by ohmic effects, but near the edge, electrode kine…
Abstract
In recent years, several investigations have been reported on the strength and behavior of concrete reinforced with natural fibers. Since natural fibers are available in abundant quantities in many developing countries, more elaborate research should be directed toward the various problems associated with the use of t…
The reaction of cubic ZrO2, with La(Co1−xNix)O3 was investigated by hot pressing at 1573 K. The reaction can been seen for all of x. The compositions of the reacted areas were estimated as La2Zr2O7, La2Zr(Ni0.6Co0.4)O6 and La2ZrNiO6 for x=0, 0.4 and 1, respectively. The width of the reacted area decreased with increas…
Energy release from a substance with relatively low oxygen compatibility is a situation which could result in the ignition and combustion of more oxygen-compatible materials such as the structural metals used in gaseous oxygen systems. At the present time there are no standard ASTM test methods for testing metals igni…
National audience
The authors developed an insulation diagnostic system that makes automatic measurements of the dielectric dissipation factor and DC component in a hot-line XLPE (cross-linked polyethylene) insulated power cable and makes an overall judgement of cable insulation deterioration. This system was tested on XLPE cables in h…
A new failure mode in AlCu and AlCuSi metallization is described in which interlevel metal short circuiting occurs between two or more levels of metal. Shorts are caused by theta-phase (Al/sub 2/Cu) hillocks which nucleate and grow during high-temperature vacuum heat treatment and processing, Hillock growth occurs at…