Materials Literature
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Hot-line diagnosis is needed to avoid breakdowns of XLPE (cross-linked polyethylene) cables due to water trees. The authors superposed a low DC voltage on an AC commercial voltage, measured the DC component of the current which passed through the insulation, and discovered that the DC component had a close relationshi…
Abstract Studies were performed to determine the toughness characteristics of composites prepared from modified addition‐type polyimides, using Celion 6000 graphite fiber as the reinforcement. The polyimides were prepared from aromatic diamines containing flexibilizing ether connecting groups. The composite flexural a…
A series of pressurized water reactor spent-fuel samples from Turkey Point Unit 3 have been oxidized at temperatures between 140 and 225°C in air atmospheres with dew points between 14.5 and -70°C, using a thermogravimetric analysis system. Tests lasted between 400 and 2100 h. At the conclusion of a test, the atmosphe…
An experimental and theoretical study is presented in this paper on the corona characteristics of conductor bundles under dynamic overvoltages. Measurements have been made in the outdoor test cages of Institut de recherche d'Hydro-Québec (IREQ) on two bundles, under conditions of fair weather and heavy rain, for stead…
Electrode polarization in polymeric dielectrics is considered, and a simple model that describes the processes phenomenologically and accounts for the observable manifestations of this type of polarization is suggested. Notwithstanding the fact that certain significant parameters characterizing the model are obtained…
Spin reorientation in ${\mathrm{Nd}}_{2}$(${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{T}}_{\mathrm{x}}$${)}_{14}$B (T=Al, Si, Ti, Cr, Mn, Co, Ni, and Cu) with x=0.05 and 0.10 was investigated. The substitution of Fe by T results in a decrease of spin reorientation temperature (${T}_{\mathrm{SR})}$. T…
Results of HVAC and HVDC (high-voltage alternating current and direct current) artificial contamination tests on station post insulators are reported. The tests were conducted using the clean fog method at various severity levels. The contamination behavior of station post insulators with semiconductive glaze was also…
Rayleigh–Brillouin scattering measurements on various multicomponent halide glasses and some selected oxide glasses were performed. The Brillouin linewidth measurements, the Brillouin intensities, and Brillouin frequency shifts allowed us to calculate the phonon attenuation, Pockels elasto-optic coefficients, and the…
Precipitation in a high nitrogen austenitic stainless steel of the Nitronic series has been studied. Above a critical nitrogen concentration, cellular precipitation is observed together with formation of Cr2N as a general precipitate and intragranular precipitation of Z phase (Cr2Nb2N2). The nature of cellular precipi…
A p-band theory calculation is reported on a single layer of graphite, the nomenclature and methods of molecular orbital theory being used. Interaction between non-nearest neighbours at increasing distances is included to determine the extent of significant electron interaction. A criterion to determine this limit is…
The photoluminescence (PL) and electroluminescence (EL) from single‐crystal Mn‐doped centered at 580 nm was investigated. The PL was quenched by surface modification with poly(vinylferrocene). The effect of p H and temperature on the EL of in aqueous and butyronitrile solutions upon reduction of peroxydisulfate ion wa…
Positional parameters ( x, y, z ) and anisotropic Debye–Waller factors B ⊥ (normal to the xy plane) and B || (parallel to the xy plane) have been determined for the Fe and Cl atoms in FeCl 3 within the space group R {\bar 3} with a = 6.065, c = 17.42 Å. These are (0, 0, 1/3), B Fe⊥ = 1.75 and B Fe|| = 1.2 Å 2 for the…
We have investigated higher-order packing entropy effects on the fundamental elastic properties of a liquid-density nematic system of hard spherocylinders as a function of molecular geometrical anisotropy by starting with the systematic density-functional formalism. We have constructed the free energy and the direct p…
The polarised absorption and reflectance spectra of the three TCNQ salts pyridinium (TCNQh, triethylammonium (TCNQh and thermally damaged quinolinium (TCNQh indicate that the absorption features are governed by reflection characteristics. The maximum reflectance curve shows a broad minimum which corresponds to a negat…
Abstract It was proved that there are two isomorphic series of mixed crystals in the CeO 2 La 2 O 3 systems from 0 to 14 mol% CeO 2 ‐mixed crystals based on the La 2 O 3 structure and from 32 to 100 mol% CeO 2 ‐mixed crystals based on the CeO 2 structure. The oxides were obtained by co‐precipitation of oxalates, foll…
Abstract The solubilities of a series of symmetrical tetraalkylammonium salts, R4NX (R=CH3–n-C8H17, including i-C4H9 and i-C5H11; X=Cl, Br, I, NO3, and ClO4), in water have been determined over the temperature range between 5 and 45 °C. The solubilities of these salts were found to be strongly dependent upon both the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(Cyclopentadienyl)ruthenium complexes of 3-methoxyestrone. A high-field NMR and x-ray crystallographic studyRobert M. Moriarty, Yi Yin Ku, U. S. Gill, Richard Gilardi, Richard E. Perrier, and Michael J. McGlincheyCite this: Organometallics 1989, 8, 4, 960–967Publication Date…
Moisture layers with low layer conductivity are characterized by low power dissipation, e.g. 50 mW for the epoxy resin model post insulator under investigation. Under those conditions, no temperature-related dry zones appear, but micro partial discharges (PDs) cannot be excluded. The appearance of these discharges dep…
Abstract Orthorhombic α‐S 8 and quenched liquid sulfur have been irradiated by mercury or xenon high‐pressure lamps at temperatures of 2 – 70 K and the radicals produced detected by ESR spectroscopy. Depending on the sample, sample temperature, radiation wavelength, and microwave power three sulfur radicals (α, β, β')…
Abstract A detailed quantitative comparison between thin section electron microscopy, utilizing the chlorosulfonation technique, and the Raman low‐frequency acoustical mode (LAM) in determining the crystallite size distribution in polyethylenes having narrow distributions is made. Three different polyethylene systems…