Materials Literature
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Lanthanum manganite, an air electrode material of solid oxide fuel cells, is well known for its complicated nonstoichiometry, which depends upon oxygen partial pressure. This nonstoichiometry is considered to have a relation to electrode activity as it affects oxygen activation and/or oxide ion sink sites, etc. Howeve…
In a uniform field arrangement, under direct voltage, positive streamer propagation and breakdown are investigated along cylindrical insulators with different profiles, inserted perpendicularly between two parallel plane electrodes. The basic properties of streamer propagation and breakdown, namely the electric field…
This paper presents a physical model of the properties of polycrystalline ferrites below magnetic saturation, a common condition in many applications of ferrites in microwave devices. The properties are mainly characterized through the elements of the effective permeability tensor as functions of magnetization state,…
With the goal of reducing SF/sub 6/ gas usage, we investigated partial discharge (PD) and breakdown (BD) mechanisms in ultra-dilute (0 to 1%) SF/sub 6//N/sub 2/ gas mixtures. The experimental results and discussions are given in this paper. In particular, we focused our research on the transition characteristics of th…
To construct an artificial photosynthetic system, multi-Zn(II)-mesoporphyrins in peptide dendrimers were equipped as a photosensitizer of photoinduced hydrogen evolution in a four-component system (electron donor, photosensitizer, electron carrier, and catalyst), so that hydrogen was evolved effectively by the dendrim…
The results of an X-ray photoelectron spectroscopic investigation of the oxidation of surface layers of low-density polyethylene (LDPE) and biaxially oriented polypropylene (BOPP) films are presented. The analysis was performed using different take-off angles, namely 10°, 30°, and 90°; thus, the depths of the examined…
The first structural report of an unprecedented organotellurate(IV) inorganic-organic hybrid macrocyclic host encapsulating a bromide anion guest is described.
Two mesogenic thioindigo derivatives containing oligomeric di- and trisiloxane end-groups were synthesized in optically pure form. These materials form enantiotropic SmA* liquid crystal phases over temperature ranges of 120–143 °C and 110–146 °C, respectively, and exhibit electroclinic switching. The electroclinic coe…
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…