Materials Literature
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Experimental results of accelerated aging tests conducted on two types of high voltage polymeric outdoor insulators are presented. The investigated housing polymers were ethylene propylene diene monomer (EPDM) and silicone rubber (SR). The polymer performance under environmental stresses and electrical stresses were s…
The heat capacity of SrFeO3−δ; δ = 0.50, 0.25 and 0.15 has been determined for 10 < T/K < ≈ 800 K by adiabatic calorimetry. The total heat capacity has been analysed and the entropy of the magnetic and structural order–disorder transitions derived. The excess heat capacity of SrFeO2.50 relative to the mixture of the b…
Sol-gel derived ZnO thin films were prepared on platinized Si wafers and fired to temperatures ranging from 550C to 700C. Multiple spincoating was performed with an intermediate firing at 400C between coatings to obtain films up to 6000 A thick. Top Pt electrodes were sputtered to form monolithic capacitors. Dielectri…
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Computer aided partial discharge detection, recognition and classification at AC voltage has become common practice in recent years. Characteristic discharge phase distributions have been found, thus providing the possibility to recognise and assess possible defects in HV apparatus. For diagnostic purposes, fingerprin…
This paper presents a novel method for the minimization of three-phase transformer inrush current in the case of sustained switching-on operations. First, a simple mathematical model of the three-phase transformer was derived taking the residual flux and the switching-on instant into consideration. A table of optimum…
The leakage current and material performance of various naturally aged nonceramic distribution class insulators, referenced to glass cap and pin insulators, are presented and discussed. The insulators were energised under a severe marine environment for a period of six months, on a 22 kV insulator test rig situated at…
Protoporphyrin IX zinc(II) (ZnPP) and its mixtures with N -hexadecylethylenediamine, hexadecyltrimethylammonium bromide, and didodecyldimethylammonium bromide in a molar ratio of 1:2 were used to investigate the Langmuir monolayer and Langmuir−Blodgett (LB) film behaviors. The well-defined Langmuir monolayers were for…
The synthesis, structure, and physical properties of a Heisenberg exchange-coupled cluster containing naphthalene groups are described. [Fe2(O)(O2CCH2C10H7)2(TACN-Me3)2]2+ (3) crystallizes in space group P1 with unit cell parameters a = 12.94(2) A, b = 14.84(2) A, c = 15.23(2) A, alpha = 101.12(7) degrees, beta = 90.8…
The hydrated tris(dibenzoylmethanido)(o-phenanthroline)europium(III) complex, [Eu(DBM)3(Phen)]·xH2O, is converted efficiently into anhydrous tris(dibenzoylmethanido)(o-phenanthroline)europium(III), [Eu(DBM)3(Phen)] or [Eu(C15H11O2)3(C12H8N2)], by heating under vacuum. The title compound has been characteriz…
A shadow mask technique employing V 2 O 5 nanowires and ion-beam milling is used to define narrow lines of monolayer-encapsulated Au nanoclusters. When positioned between electrodes these lines are shown to be conducting and to have nonlinear I−V characteristics with nonzero threshold voltages consistent with Coulomb…
Stator insulation failures are a significant cause of forced outages of electrical machines. Accelerated aging tests or type tests have been developed and are now applied routinely to groundwall insulation in coils and bars used in machines to ensure satisfactory life time performance. It is generally accepted that ma…
BNFL Instruments RadScan 600 has been developed to allow the remote surveying of gamma radiation in a wide variety of environments. The device is based on a CsI crystal located in a tungsten collimator and is capable of detecting gamma rays with energies between 100 keV and 10 MeV. A colour CCD camera produces a visua…
The Pulsed Electro-Acoustic (PEA) method has been used for the measurement of space charge distribution in solid dielectric films or cable shape samples. However, the PEA system for cable shape samples had a curved surface electrode, which had the same radius curve to the outer radius of the sample cable. Therefore, i…
A MW-class, commercial prototype Westinghouse tubular solid oxide fuel cell (SOFC) power plant is being developed for demonstration by the end of this decade. A 5 MW integrated SOFC/combustion turbine power plant design for distributed power applications is shown which can achieve an efficiency approaching 70%. The re…
The use of high voltage cables is today recommended and sometimes mandatory in order to avoid environmental concerns of the public, especially when the power system crosses areas of dense population. The reunion of the former GDR with the Federal Republic of Germany has stimulated the interest in this settlement espec…
We introduce the use of the concept of continuity in symmetry and chirality as a novel descriptor of the structure of the building blocks of materials. These measures are of global nature, and take into account all angles and bond lengths of the molecular building blocks. The particular example we have selected for a…
Metalloproteins constitute a significant proportion of all known genomes. In this Article it is shown that the marriage of two synchrotron-radiation-based structural techniques, namely high-resolution crystallography and XAFS, can yield unprecedented levels of structural information that is directly relevant to the me…
This work presents a study of the influence of the winding strategy in the parameters of the flyback transformer. A frequency and geometry dependent model generated from FEM simulations has been employed in order to study the influence of the position of the windings on the leakage energy and AC resistance. A study of…
The ketals of bis(o-nitrophenyl)ethanediol and ketones or aldehydes are smoothly deprotected in neutral conditions by irradiation with 350 nm light. The chemical stability in basic, acidic, and oxidizing media makes this form of protection orthogonal to classical protecting groups. Both racemic and enantiopure forms a…