Materials Literature
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Poly(epsilon-caprolactone-co-D,L-lactide) copolymers with 10, 30, and 50% by weight of silk particles (size range: 5-250 microm) derived from Bombyx mori were blended in acetone solution. After evaporation of the solvent, the morphology, thermal behavior, and mechanical properties of the composites were examined. The…
This work investigated the thermal stability of tungsten carbide films deposited by a sputtering process with a WC target as diffusion barrier layer between Cu and Si. The as-deposited film has a nanocrystalline structure and a low electrical resistivity of around 227 μΩ cm. Film characterization reveals that the film…
It is well established that superplasticity requires a small grain size and therefore there is an interest in developing processing methods having the capability of reducing the grain size below that generally produced in conventional thermo-mechanical processing. Experiments were conducted on a superplastic Zn-22%Al…
Superelastic Ni–Ti alloys are widely used as engineering and medical materials. However, the alloy is susceptible to environmental embrittlement in a corrosive atmosphere. Accelerated tests of hydrogen embrittlement of the Ni–Ti alloy were carried out. The effect of electrolytic charging hydrogen on the properties of…
The density depth profile and chemical bond structure of hydrogen silsesquioxane (HSQ) thin films treated with an plasma with varying power and exposure time were measured using specular X-ray reflectivity (SXR) and Fourier transform infrared (FTIR) spectroscopy. The SXR data indicated that the density profile of an u…
Poly(acrylic acid-co-methyl methacrylate)-cetyltrimethylammonium bromide (P(AA-co-MMA)-C16TAB) complex has shape memory behavior due to the formation of crystalline aggregates among the long alkyl chains of C16TAB in the complex, and can be regarded as a novel shape memory network.
Entandrophragma angolense is a medicinal plant used in folk medicine against several diseases including peptic ulcer. Methyl angolensate was isolated from E. angolense by recrystallization from methanol. The needle-like crystals were characterized and tested on isolated rabbit jejunum, guinea pig ileum and the rat fun…
In a sol–gel process, metal acetates reacted with thioacetamide to form the corresponding metal sulfides homogeneously dispersed in a colloid. The as-prepared dry gels were decomposed by heat treatment at 120 °C to form MS/TiO2 (M = Pb, Zn, Cd) nanocomposites. The products were analyzed by infrared spectroscopy, X-ray…
Abstract- An investigation of ferroresonance in a 230-kV transformer is undertaken. Correct modelling of the iron-core losses and the direct magnetic coupling between phases are shown to be important in duplicating field observations. A brute-force time-domain method and an analytical method for displaying margins to…
SummaryDuring the Workshop on Corrosion in SCWO Systems held at MIT in 1993 the attendees recognized the potential for corrosion to restrict the commercialization of SCWO for aggressive waste streams. At that time, the group consensus was that a material of fabrication universally applicable to all sections of a SCWO…
A relocatable static VAr compensator (SVC), rated 0 to +225 MVAr at 400 kV, has been supplied to the National Grid Company (NGC) for its East Claydon substation in Buckinghamshire, England. The SVC comprises a fixed filter of 23 MVAr, a conventional TSC of 127 MVAr and a GTO-based STATCOM of 75 MVAr. All are connected…
Abstract The behavior of the semicrystalline polymer polypropylene (PP) was studied in the pre‐necking domain. Mechanical tests were performed to characterize its viselastic and its viscoplastic behavior. The usual approach for studying metals was adopted to investigate the effect of heterogeneities caused by spheruli…
An oxygen sensor based on yttria-stabilized zirconia with Ni-NiO mixture as a solid reference electrode for high temperature applications has been fabricated and tested. During high temperature use Ni reacts with inner Pt electrode and Pt lead wire, and affects the output signal of the sensor leading to a limited life…
Blends of linear low density polyethylene (LLDPE) and LLDPE grafted maleic anhydride (LLDPE-g-MA) were prepared by melt mixing. The surface of cast films with different contents and types of maleated PE were characterized through contact angle and wetting tension measurements, as well as attenuated total reflection IR…
A criticality accident occurred on September 30, 1999, in a conversion test facility at the JCO Tokai site. The accident was triggered by pouring an 18.8% enriched uranyl nitrate solution into a precipitation vessel beyond the critical mass. The accident continued for about 19 hours before the criticality could be sto…
Tracking and erosion behaviors of high temperature vulcanized (HTV)-silicone rubber (SIR) of 0.5 to 6.0 mm thicknesses were investigated in order to obtain the optimum thickness for enhancing tracking and erosion resistance under various leakage current levels. Under low leakage current, thinner samples showed a highe…
Temperature-dependent in situ W L3-edge X-ray absorption spectroscopy has been performed at 20–500 °C to investigate the geometric environment and electronic structure of tungsten upon the transformation of electrochromic peroxopolytungstic acid to tungsten trioxide. The temperature-dependent variation of the coordina…
Erosion of the divertor and first-wall plasma-facing components, tritium uptake in the re-deposited films, and direct implantation in the armour material surfaces surrounding the plasma, represent crucial physical issues that affect the design of future fusion devices. In this paper we present the derivation, and disc…
Polyaniline doped with R-(−)- or S-(+)-camphorsulfonic acid produces an inexpensive chiral substrate; the presence or absence of water can be used to invert the dopant-induced circular dichroism (CD) absorbance at 450 nm, shedding light on conflicting literature reports.
Shielding of magnetic fields at power frequencies has been investigated by computation and experiment. Different types of low-cost soft magnetic laminations (low-carbon steel, nonoriented Fe–Si, grain-oriented Fe–Si) and different shield geometries (plane, U-shaped and box-like) have been considered. The shielding fac…