Materials Literature
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Abstract Polyamide‐6 (PA6)/vermiculite nanocomposites were fabricated through the direct melt compounding of maleic anhydride‐modified vermiculite (MAV) with PA6 in a twin‐screw extruder followed by injection molding. The structure and morphology of the nanocomposites were determined by X‐ray diffraction and scanning…
The installation and of a 5 MVA, 4.16 kV Distribution-level Static Reactive Compensator (D-STATCOM) was completed in July, 1999 at the Seattle Iron & Metals Corporation's new steel recycling facility in Seattle, Washington, USA. The D-STATCOM technology was selected as the preferred option for the voltage flicker comp…
Lanthanide 2,3-pyrazinedicarboxylate complexes with three-dimensional frameworks, [Ln2(pzdc)3(H2O)]x·2xH2O [Ln = Pr (2), Nd (3), and Eu (4)], were obtained by hydrothermal reactions of 2,3-pyrazinedicarboxylic acid (H2pzdc) and the lanthanide(III) chlorides, while [La2(pzdc)3(H2O)]x·2xH2O (1) was obtained by hydro(sol…
By applying a negative voltage to the conducting tip of an atomic force microscope, we modify on submicron-scale semiconducting oxygen deficient SrTiO3−δ thin films grown on LaAlO3 substrates. In comparison with the as-grown film, the modified regions present different electrical and structural properties, which can b…
We report on verification of the proposed energy transfer mechanism responsible for photoluminescence of rare earth (RE) ions in semiconductors. Using two-color spectroscopy in the visible and the midinfrared regions (with a free-electron laser) we demonstrate reversal of the most important step in the excitation proc…
Gain-determining coefficients in Er-doped, nanocrystal-Si (nc-Si) sensitized silica waveguide amplifiers are investigated. Single-mode, Er-doped silica waveguides with nc-Si embedded in them were prepared by electron cyclotron resonance plasma-enhanced chemical vapor deposition of Er-doped a-Si:Ox (x<2) followe…
Electromagnetic wave scattering by two rectangular troughs on a ground plane, which is the simplest trough-grating geometry, is rigorously analyzed by using Kobayashi and Nomura's method. This method is a kind of eigenfunction expansion method in terms of Weber-Schafkeitlin type integrals. In order to show the validit…
The stator winding insulation of large generators suffers from combined stresses including thermal, mechanical, electrical and environmental stresses in service, resulting in gradual deterioration. In the present investigation, a multistress aging test model including electrical, thermal, mechanical vibration and ther…
This paper describes the harmonic analysis method which can be used to measure the resistance current of the metal oxide arrester (MOA) and the dielectric loss of the capacitive apparatus. The theory of this method and the requirement to the hardware circuit are introduced also. The testing and the analysis of the the…
Results of investigations performed in order to improve the current diagnostic techniques used for the evaluation of insulation systems of AC rotating machine stator windings are presented. Improvements come from the development of a new measuring system and the stochastic analysis of partial discharge (PD) pulse sign…
We have shown that reduction of deuterium permeation through AISI 316L stainless steel can be obtained by the deposition of an (Al,Ti)N coating: a 1.7-μm-thick coating was able to reduce the deuterium permeation flux by a factor 100–1000 in the 473–873 K temperature range. This result is related to the very low diffus…
This paper describes our theoretical and experimental approaches to the mechanisms responsible for electrical conduction at low and high fields, electrical aging, partial discharge and breakdown phenomena in insulating polymers. Electrical conduction always involves carrier injection from electrical contacts and subse…
This paper investigates the use of finite-difference time-domain (FDTD) models in the study of electrical discharges, particularly through the measurement of radiated signals. Support for electrostatic fields within the model is demonstrated. Signals radiated by a partial discharge pulse are simulated and found to be…
Accurate measurements of core loss for distributed-air-gap magnetic materials have traditionally been very difficult to obtain. Wattmeter measurements are affected by very small phase and time-delay measurement errors, while traditional calorimeters measure the sum of excitation winding loss and core loss. This paper…
The variations in the low frequency dielectric spectra of mass impregnated insulation depending on its moisture content have been investigated. For the calibration purposes a number of the impregnated paper samples was kept in the desiccators where different relative humidities were maintained. Thus obtained moisture…
We present experimental evidence for the existence of interlayer states formed in graphite-sulfur (C-S) composites. We have studied occupied and unoccupied p bands of the C-S composites by means of soft x-ray absorption and emission spectroscopy. New spectral features in the C $1s$ absorption are interpreted as contri…
An electrically reprogrammable resistor approach has been developed as a basis for a new nonvolatile memory that is potentially denser, faster, and easier to make than Dynamic RAM (DRAM). It relies on structural phase transitions induced by nanosecond-scale heating and cooling of small volumes of chalcogenide films wi…
This paper deals with the influence of continuous thermal aging on the dielectric and mechanical properties of Cross-Linked Polyethylene (XLPE) used as electrical insulation in high voltage cables manufactured by ENICAB (Algeria). In order to characterize the degree of the material degradation under thermal aging and…
This paper reports a dimethyl sulfoxide (DMSO) phase offered by a coordination polymer gel that consists of metal ions and a calixarene that has multiple binding sites. This metallogel, virtually 98% of which is DMSO, has high stability in aqueous solution over a wide range of pH (1−13), even at 100 °C, rejects ions (…
Ageing of insulation materials and systems may well be detected by quantitative measurements of their dielectric response. Such measurements can be performed in the frequency or time domain. In this contribution, a novel type of equipment based on relaxation current measurements is introduced which is designed for on-…