Materials Literature
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It has been demonstrated that intramolecular hydrogen bonding in two classes of dichroic azo dyes has a generally detrimental effect on order parameter in a nematic liquid crystal host. Derivatives of 4-(N,N-diethylamino)-4′-nitroazobenzene with hydroxy groups intramolecularly hydrogen bonded to the azo group show low…
Two new octanuclear Cr(III) carboxylate complexes are reported illustrating a temperature dependent route to high nuclearity species.
This paper describes some of the authors' practical experiences in the on-line measurement of partial discharges in medium voltage motor and generator stator windings. Economic considerations are discussed as well as the use of traditional and nontraditional sensor applications. Comparisons and practical recommendatio…
Porous polyimide films were prepared by 2 steps. The first step is the preparation of poly(urethane-imide) films by a reaction between phenol-terminated polyurethane prepolymer and poly(amide acid). Polyurethane prepolymer was prepared from the reaction of polyethylene adipate and hexamethylenediisocyanate. Poly(amide…
This paper presents the latest results of continuous investigations of cable insulations degradation of crosslinked polyethylene (XPLE) and ethylene-propylene with rubber based formulation (EPR) when subjected to electric stress and heating in the presence of water or water vapour. The paper deals with water absorptio…
The Insulated Conductors Committee of the Power Engineering Society at a recent meeting recognizes Al Gilbert and Frank Precopio, the two inventors of chemically crosslinked polyethylene. Because of the historic significance for insulation technology, the remarks made by these two inventors are reproduced in this maga…
The amazing oxygen exchange properties within the Ce2Sn2O7–Ce2Sn2O8 pyrochlore solid solution were investigated by means of in situ neutron diffraction experiments. The structural modification of the Ce2Sn2O7 phase heated under oxygen up to 1000 °C was followed on the basis of the neutron diffraction patterns, continu…
Lattice energy minimization techniques have been used to study the 2D molecular organization of [Ru(bpy)3]2+ and [Ru(phen)3]2+ confined in the interlamellar space of low charged smectites with respect to the stereochemistry of the pillars and the charge distribution within the host. The simulation results underline th…
Electrical contacts to porous silicon (PS) were formed by depositing aluminum onto its surface. The corresponding Al/PS/Si structures show a rectifying behavior, even after prolonged times in contact to the atmosphere. The series resistance and the ideality factor as a function of time of storage in ambient air have b…
Uncoupling of the dynamic equation for cyclic periodic structures and U-transformation analytical solutions for cyclic periodic structures linear periodic structures - discrete systems linear periodic structures - continuous systems structures with periodicity in two directions exact solution of the finite element equ…
The synthesis and magnetic behaviour of poly[6-(N-oxyl-N-tert-butylamino)biphenyl-3,3′-ylene] 2 are described. Polyradical 2 was prepared by the Pd-catalyzed polycondensation of N-tert-butyl-2,4-dibromoaniline and 1,3-phenylenebis(trimethylene boronate), followed by oxidation with 3-chloroperoxybenzoic acid. The degre…
This paper identifies corona and local arcing as the major ageing influences on silicone rubber surfaces. The hydrophobic properties of silicone rubber lead to the formation of discrete water droplets on the surface and these can lead to local enhancement of the electric field and corona activity. This activity leads…
1,4-Diisobutylene-2,3,5,6-tetraxydroxy-1,4-diphosphine oxide (Cyagard) provides good fire retardant performance for poly(butylene terephthalate) (PBT) as measured by the UL94 test whereas the combination of Cyagard with some co-additives helps to increase the limiting oxygen index (LOI). A correlation between the soli…
The glass‐melt penetration of dense TiO 2 polycrystals (where the grains are initially in contact) and the sintering of SiO 2 ‐coated TiO 2 powders (where the grains are initially separated) have been used to investigate the influence of initial particle separation on final microstructures. Grains that were initially…
The electrochemical behavior of a series of undecatungstozincates monosubstituted by first-row transition metals, ZnW11M(H2O)O39n– (M = Cr, Mn, Fe, Co, Ni, Cu or Zn), was investigated systematically and comparably in aqueous solutions by electrochemical and in situ UV-visible-near-IR spectroelectrochemical methods. Th…
Since 1D magnetic component models are widely used, it is very important to understand the range of their application. This work presents an analysis of 1D magnetic component models in order to study their range of application. The errors that can result when these models are not properly applied have been quantified.…
A synthetic semiconductive p-type diamond electrode was photosensitized by the Ru(bpy)32+ molecule in an electrolyte solution. The photoexcited molecule injects a hole into the valence band. However, under a certain potential, charge recombination occurred through interband states; the hole on the top of the valence b…
(1999). Recent advances in oxide-oxide composite technology. Advanced Composite Materials: Vol. 8, No. 1, pp. 17-23.
Oxidation of copper by atomic oxygen was found to differ significantly from oxidation by ordinary molecular oxygen. Firstly, a strong enhancement of oxidation was observed, particularly at the initial stages of oxidation (up to 106 times compared to molecular oxygen). The reaction probability of atomic oxygen is betwe…
Wear test was carried out by using the two disc type wear testing simulator to clarify the effects of the following factors on the surface deterioration in high alloyed grain cast irons. Namely, contact stress, microstructures, high temperature wear behavior and initiation and propagation of the surface microcrack whi…