Materials Literature
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The dielectric properties of epoxy resin have been studied as a function of hydration. The epoxy was studied in an un-filled state, filled with 40 μm SiO2particles, and filled with 50 nm SiO2particles. The relative humidity was controlled by saturated salt solutions at ambient temperatures from 298-353 K. Measurements…
The resonance condition of a leaky mode propagating in a dielectric multilayer, which is supported by a mirror and excited by a free-space wave from the cover medium, is simply derived from the phase of the reflection at the mirror and cover interfaces. The leaky mode resonance is used to obtain 100% first-order diffr…
Abstract Electroless Ni‐P‐ZrO 2 and Ni‐P coatings on AZ91D magnesium alloy were prepared, and their corrosion protection properties were compared in this paper. The potentiodynamic curves and electrochemical impedance spectroscopy (EIS) of the coated magnesium alloy in 3.5% NaCl solution showed that the corrosion perf…
This paper analyzes the accuracy of current transformers (CT) when excited with nonsinusoidal currents. It uses a nonlinear model that accounts for the minor hysteresis loop of the core. It was concluded that instrument transformers with accuracy class 0.6 or better provide reasonably accurate measurements of current…
Increasing need of cost effective identical sensors for partial discharge (PD) location prompted us to take up this research study. Four high-frequency current transformers (HFCT) were assembled and its performances with a used commercial sensor were compared with the known type of PD signals. In this paper, the respo…
Zinc oxide films doped with Mn (Mn:ZnO) were prepared by implanting Mn+ ions into ZnO films deposited by pulsed laser deposition, and their structure and magnetic properties were studied. The Raman spectra of the films indicated that Mn ions occupied the Zn site of ZnO after annealing, while the as-implanted films wer…
A kinetic study of Ca-montmorillonite dehydration was performed based on information derived from X-ray diffraction (Ferrage et al. 2007, this issue) and, thus, focusing on interlayer water only. The dehydration was quantified following the two processes that were observed in the X-ray pattern modeling: the transition…
Abstract Low‐pressure, plasma‐enhanced (PE)CVD is a powerful and versatile technique that has been used for thin‐film deposition and surface treatment since the early 1960s. However, it is only recently that it has been used in applications other than the different stages of microelectronic circuit fabrication. Now, P…
In this paper, multi-walled carbon nanotubes (CNTs) were first purified and oxidized by blend acid composed of vitriol and nitric acid, and then surface decorated with biopolymer chitosan via a controlled surface deposition and crosslinking process. The results showed that the diameter of CNTs became thicker because t…
Stress corrosion cracking (SCC) of stainless steels (SS) is a significant cause of failure in the pressurized water reactors (PWR). Most of the reported case history failures of SS in PWR can be attributed to pollutants (chloride, sulphate) and / or locally oxygenated environments, even to sensitisation of the SS. How…
Although austenitic stainless steels do not show a high degree of susceptibility to stress corrosion cracking (SCC) in PWR primary environments, there is limited evidence from laboratory testing that crack propagation may occur under some conditions for materials in a cold-worked condition. A test program is therefore…
In this paper the design point definition of a pressurised hybrid system based on the Rolls-Royce Integrated Planar-Solid Oxide Fuel Cells (IP-SOFCs) is presented and discussed. The hybrid system size is about 2 MWe and the design point analysis has been carried out using two different IP-SOFC models developed by Ther…
Penium margaritaceum (Streptophyta) is a desmid that is commonly encountered in biofilms of wetlands of the Adirondack region of New York. This alga was isolated and has become an important model organism for laboratory studies dealing with the production and secretion of the extracellular polymeric substance (EPS) an…
Over the years, developments in nitriding have been driven by the need to address environmental concerns, and reduce both energy consumption and process time. The present investigation demonstrates the feasibility of nitriding of commercial grade austenitic stainless steel, in the plasma generated during the aqueous e…
The low cycle fatigue tests of the type 316LN stainless steel were conducted to investigate the cracking mechanisms in high-temperature water. The fatigue lives of the specimens tested in 310°C deoxygenated water were considerably shorter than those tested in air. For the specimens tested in 310°C deoxygenated water,…
In order to investigate the photochemical tuning capability of chiral monomers and polymers containing end‐capped menthyl groups, a new series of chiral dopants was synthesized and added to commercially available nematic liquid crystals to induce cholesteric liquid crystal (LC) phases. The addition of chiral dopants w…
Nonagglomerated Si nanocrystals with face-centered-cubic (fcc) crystal structure was synthesized by microsecond pulse laser ablation in water. The long pulse width of the adopted laser is propitious to generating a high-temperature-and-high-pressure ambient, which is responsible for the formation of fcc Si nanocrystal…
Interfaces between dielectrics are considered one of the weakest parts of an insulation system but their behavior under electrical stress is not yet completely understood. In particular, when a dc voltage is applied, the electric field distribution at the interface is quite difficult to predict. This is mainly due to…
The anodic behavior of III–V crystals in electrolyte solutions was experimentally studied. The dependences of the pore-formation threshold voltage on the semiconductor composition and doping level, electrolyte solution composition and concentration, as well as the crystallographic orientation of the anodized surface,…
The transient fields generated during switching operations in gas-insulated substations (GIS) can have rise times in the order of a few nanoseconds. Transient fields, which are developed internally to the gas-insulated modules, leak into the external environment through discontinuities and interfere with nearby electr…