Materials Literature
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Various factors controlling the flashover of solid insulators in pressurized SF6, are reviewed and their influences in gas insulated systems are discussed from a practical point of view. Flashover voltage of clean insulator surface is under the influence of the insulator-metal contact as well as the macroscopic electr…
The sodium ion resistivity of lithia‐stabilized polycrystalline β”‐alumina was measured as a function of temperature for fine‐grained and coarse‐grained specimens with a chemical composition of 8.80 Na 2 0‐0.75 Li 2 O‐90.45 A1 2 O 3 (wt%). A model is presented which explains the dependence of sodium ion resistivity on…
The nature of the origin of the color in anodized aluminum colored by ac electrolysis in electrolytes containing nickel, copper, silver, gold, and molybdenum salts is investigated. The measured specular reflectance spectra in the region 350–750 nm can be adequately explained by assuming that small metallic particles a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of iron phthalocyanine complexes in nonaqueous solvents and the identification of five-coordinate iron(I) phthalocyanine derivativesA. B. P. Lever and J. P. WilshireCite this: Inorg. Chem. 1978, 17, 5, 1145–1151Publication Date (Print):May 1, 1978Publication…
Abstract The reinforcement of elastomers by carbon black is governed by the morphology of the black and its physical and chemical interactions with the polymer. The latter are strongly affected by graphitization and surface oxidation. In modern rubber-grade carbon blacks strong bonding of the polymer to the carbon bla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 36. Synthesis and optical and electronic properties of some ruthenium and osmium octaethylporphyrinsArtemis Antipas, Johann W. Buchler, Martin Gouterman, and Paul D. SmithCite this: J. Am. Chem. Soc. 1978, 100, 10, 3015–3024Publication Date (Print):May 1, 1978Pub…
Glasses in the system Al 2 O 3 ‐Y 2 O 3 ‐SiO 2 , containing TiO 2 and La 2 O 3 , were investigated. Glasses of high refractive index and elastic modulus were developed. The observed Young's and shear moduli of these glasses show good agreement with theoretical values. Agreement was also found between the observed and…
Abstract Fourier transform infrared studies of the thermal degradation of polyacrylonitrile (PAN) conducted at 200°C in air and under reduced pressure are presented. The spectra are markedly superior to those published previously. A mechanism consistent with the infrared results obtained under reduced pressure is adva…
Met-tRNA,, initiator methionyl transfer RNA.SDS, sodium dodecyl sulfate; Gpp(CH,)p, guanyl-5'-yl methylene diphosphonate; App(CHJp, adenyl-5'-yl methylene diphosphonate; EMC, encephalomyocarditis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of Changes in Bubble Size Distribution Due to Interbubble Gas Diffusion in FoamRobert LemlichCite this: Ind. Eng. Chem. Fundamen. 1978, 17, 2, 89–93Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published inissue 1 May 1978https:…
A theory based on two electrons hopping between defect sites recently proposed (Elliott 1977, 1978) to account for the frequency dependence of the conductivity of chalcogenide glasses is analysed here with regard to the predicted temperature dependence. To a first approximation, the logarithm of the a.c. conductivity…
We present evidence that in carbon-polyvinylchloride composites, consisting of aggregates of carbon spheres (100-400 \AA{}) dispersed in the insulating matrix, the electrical conductivity can be ascribed to a novel mechanism of tunneling with potential-barrier modulation by thermal fluctuations. Theoretical considerat…
A systematic compilation of chemical thermodynamic and elementary reaction rate data has been carried out, using information obtained from literature searches and chemical kinetic modeling. These data are presented in a flexible and convenient form for use in computer programs which require such input data.
For pt.I see ibid., vol.11, p.1523 (1978). A set of interionic potentials of the Born-Mayer form is derived for the alkali halides. The specification is completely in terms of parameters of two types, (a) parameters which relate to the constituent ions and (b) parameters which apply to all crystals. Thus the parametri…
Room temperature measurements of the phonon dispersion relations in ferroelectric lithium niobate have been carried out by inelastic neutron scattering. Most of the measurements were made along the c* direction with two acoustic branches measured along an a* direction. The q to 0 slopes of the acoustic branches are fo…
A consistent set of shell parameters for alkali halide crystals of both rocksalt and CsCl structures is reported. The fitting procedure, values of the parameters and their sensitivity are discussed. Short range interionic potentials are determined and are shown to give a good description of both static and dynamic pro…
A study of variations of charging and discharging transients in low-density (0.918 gm cm -3 ) polyethylene has been made over a wide range of fields and temperature and a limited range of sample thickness and electrode materials. In the temperature range 113-273K two broad isochronal (i.e. current at constant time) pe…
A general description is given of the behavior of polymeric dielectrics in low fields, including polarisation and depolarisation, and transient and steady state conduction, in isothermal and non-isothermal conditions. An attempt is made to present a unified interpretation applicable to all of these phenomena.
Measurements are reported on the lateral motion of charges along thin films of polyethylene terephthalate (PET) in air at 40% humidity. A sensitive, high-resolution induction probe coupled to a computer is used to scan the sample in a raster mode. Thus it is possible to produce not only line scans of the charge distri…
Vacancy mutation by (about six) trapped helium atoms — as has been observed in molybdenum — reduces the vacancy concentration, at which interconnecting paths for the helium begin to form, from 16 to 10% in b.c.c. materials. This follows from percolation studies which include this mutation effect.