Materials Literature
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Abstract We report the development of a new analytical expression for the electron stopping power (SP) for electron energies between 200 eV and 30 keV. This expression describes the product of the SP and the inelastic mean free path (IMFP), and is a simple function of atomic number and electron energy. Parameters in t…
In this letter, we propose an automatic classification scheme of discharge sources on the basis of Fourier spectrum for received electromagnetic (EM) pulses. Confirming the reproducibility of EM pulses from each source validates this scheme. The recognition rate for six discharge sources is 80% or better. The feature…
In the present paper, the tracking phenomena of silicone rubber material has been studied under ac voltages, with ammonium chloride as a contaminant. The characteristic changes in the tracking time of the aged specimens are analyzed through leakage current measurement. The observed trends in the leakage current during…
Based on the in vitro and the in vivo analyses, silica xerogels can be characterized as resordable and biocompatible materials for the controlled release of drugs and larger biologically active molecules.
A correlation method is proposed for the location of partial discharge within a winding. Theoretical simulations and experimental results on a lumped parameter model of a winding are shown to prove the feasibility of the method.
Abstract Devulcanization of waste rubber poses a challenging environmental, economical, and disposal problem in the world because of their cross‐linked three‐dimensional network structure. Devulcanization of gum natural rubber vulcanizate containing three different sulfur/accelerator ratios was carried out in 90°C for…
Abstract A series of new Polypropylene (PP)–clay blends, containing 5 wt % clay, were prepared by melt compounding with maleic anhydride grafted poly(ethylene‐co‐octene) (MAH‐g‐POE) as the compatibilizer by varying its content from 0 to 20 wt %. The effect of MAH‐g‐POE on the PP–clay miscibility was examined by X‐ray…
This paper describes the use of simulation techniques to examine some of the processes involved in the alignment of voids under the influence of 2-dimensional self-interstitial atom (2-d SIA) transport. It follows an earlier paper in which the effects of 1-d SIA transport were investigated and uses similar methodology…
Abstract This article reports on a novel route to develop ethylene–propylene–diene rubber (EPDM)/montmorillonite nanocomposites Modification of the MMT was carried out with maleic anhydride (MA), which acts as the intercalation agent for MMT and the vulcanizing agent for EPDM matrix, as well as the compatibilizer for…
Abstract Failure criteria of the heat‐sealed part of oriented polypropylene (OPP) and cast polypropylene (CPP) heat seals made by an impulse type heat‐sealing machine were investigated. Circular notches and precracks were introduced to direct failure to specific areas such as inside the seal, at the border, or at the…
We have examined the impact on biological systems of some newly synthesised polyoxyethylene polymers using in vitro assays. Toxicity was tested by the 3-[4,5-dimethylthiazole-2-yl]-2,5 diphenyltetrazolium bromide (MTT) assay, haemolysis was assessed, and an ethidium bromide (EB) assay was used to study interactions be…
Abstract The effects of hydrothermal ageing on the thermomechanical properties of high performance epoxy and its nanocomposite were studied. The epoxy–clay nanocomposite was prepared through a recently developed “slurry‐compounding” approach. The cured samples were immersed in distilled water at 60°C for different per…
Time-dependent density functional theory (TD-DFT), Hartree-Fock, second-order M\o{}ller-Plesset perturbation theory (MP2), and configuration interaction of singly excited states (CIS) are applied to crystalline PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride). The systems investigated include single molecules in…
Abstract Raw natural rubber samples of different Mooney viscosity values and inherent molar mass distributions (MMD) were used to characterize changes occurring during high‐temperature mastication and to identify the structural components conditioning mastication‐induced degradation. The macrogel degraded rapidly to e…
Abstract The present work dealt with the effects of nine kinds of silicon additives on flame retardancy of ethylene‐vinyl acetate copolymer (EVA)/magnesium hydroxide [Mg(OH) 2 ] composites, as well as mechanical properties. The limiting oxygen index (LOI) test, horizontal fire test, vertical fire test, and cone calori…
The modal reflectivity and loss of lamellar diffraction gratings to be used in distributed-feedback and distributed-Bragg reflector lasers were computed in dependence of wavelength, duty cycle and Bragg order. Different methods based on the approximate coupled-mode theory and and the exact bidirectional mode expansion…
(001) c -oriented 60–70-nm-thick SrIrO 3 films with a high-pressure-stable perovskite phase were epitaxially grown on (100)SrTiO 3 substrates by metalorganic chemical vapor deposition, and the crystal structure and the resistivity of the films were investigated. X-ray diffraction techniques including general θ–2θ scan…
We have investigated microstructures giving rise to magnetocapacitance effect in Ti-doped $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$ $(\mathrm{Y}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3})$ by both electron diffraction and real-space imaging techniques. Diffuse scattering elongating along the [110]…
This letter describes a neural network approach to the prediction of the leakage current (LC) on silicone rubber insulators exposed to salt-fog. The validity of the approach was examined by testing several insulators in a salt-fog chamber. Feed-forward back propagation was found as the best method among several traini…
This paper studies the effect of the Hanning window (HW) on the processing of harmonics and interharmonics in the framework of the standard defined by the IEC. The performance of the HW is studied both in the processing of a large harmonic current fluctuation and when an interharmonic voltage component appears between…