Materials Literature
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Apical, Upilex, Kapton, Teflon AF, and PEEK polymers are characterized for AC and DC dielectric breakdown in air and in silicone oil at temperatures up to 250 degrees C. The materials are also tested in terms of their dielectric constant and dissipation factor at high temperatures with an electrical stress of 60 Hz, 2…
To elucidate the chemical changes due to dry band arcing, under wet and contaminated conditions, of room temperature vulcanized (RTV) silicone rubber used for coating HV outdoor insulators, the thermal impact of the arcing on the rubber surface was investigated. A loss of hydrophobicity, resulting in a reduction of th…
A series of the bis(octaalkoxyphthalocyaninato)lutetium(III) complexes [(CnO)8Pc]2Lu (n = 10, 12, 14, 16, 18) were synthesized. The mesomorphic behaviour was revealed by using polarization microscopy and DSC. The detailed mesophase structures were clarified by using temperature-dependent X-ray diffraction and temperat…
In this paper, we report the results of the high field magnetization and the high field/high frequency ESR measurements on [Mn III ( taa )], which is a spin-crossover complex. The observed ESR signals will be discussed in connection with the results of our high field magnetization which exhibits the first observation…
Polypropylene, a low-loss, high-dielectric-strength film was characterized for its dielectric properties under high-voltage, high-frequency conditions. The properties that were measured included the breakdown voltages and the high-voltage aging characteristics at frequencies up to 30 kHz. The exponential law is used i…
The time dependence of PZT (lead zirconate titanate) (Navy I and III) was investigated in the case of a high stress applied parallel to the poling axis. The time dependence was found to be linear in ln(t), with slope activated in temperature with an activation energy of 0.29-0.32 eV for the Navy I material and 0.62-0.…
This review is the first one in a planned series on the systems potentially suitable for high-magnetic-field and high-frequency electron magnetic resonance (HMF-EMR) studies. Such systems must best exhibit large or very large zero-field splitting (ZFS). The transition metal 3d 4 and 3d 6 ions with an orbital singlet g…
The authors present experimental results on space charge distribution at the metal-polymer interface and the polymer-polymer interface by a pulsed electroacoustic method. In order to determine how much influence impurity diffusion has on the original material, two kinds of molding LDPE (low-density polyethylene) sampl…
Even 33 years after the discovery of electrical switching in chalcogenide glasses, a complete understanding of the mechanisms responsible for this phenomenon is lacking. It is believed that threshold switching in chalcogenide glasses is electronic in origin whereas memory switching is of thermal origin. According to t…
Two new poly(ethylene glycol) supported manganese porphyrins have been prepared and their catalytic activity and recyclability were investigated for the epoxidation of alkenes using H2O2 and PhIO as stoichiometric oxidants.
The effects of orientation and stress on chemically prepared Pb(Zr,Ti)O/sub 3/ (PZT) film properties have been determined. Systematic modification of the underlying substrate technology has made it possible to fabricate suites of films that have various degrees of orientation at a constant stress level, and to fabrica…
The authors describe a space charge measurement technique for a long XLPE cable specimen. The length of the cable specimen has been limited in conventional methods, because of the problem of pulse propagation through the cable. The problem was overcome by using the pulsed electroacoustic method, and also by applying t…
Abstract Significant increases in apparent flow strength are observed when non‐uniform plastic deformation of metals occurs at the scale ranging from roughly one to ten microns. Several basic plane strain problems are analysed numerically in this paper based on a new formulation of strain gradient plasticity. The prob…
The authors describe a new type of infrared (IR) focal plane consisting of a 2-D array of microminiature bolometers (microbolometers) fabricated, complete with readout electronics, as a monolithic silicon chip. These focal planes require no cooling for sensitive detection of IR radiation. The authors report high-quali…
A simple fractal, or hierarchical, circuit model is presented which simulates the anomalous loss behavior in ferromagnetic materials as a function of frequency and peak flux density. According to this model, the anomalous losses comprise a cascade of scaling eddy current losses. The terminal voltage and current of thi…
Breakdown experiments were performed on slices of EPDM rubber pressed one against the other. To achieve this, an experimental jig was designed so as to induce breakdown between the two slices, longitudinally along their interface. Effects of interfacial pressure and of the presence of silicone grease at the interface…
Novel Cu-VOx and Fe-VOx multiwalled nanotubes have been obtained by exchange of the protonated template in the parent dodecylamine-VOx nanotubes with Cu(II) or Fe(III) salts. The intercalation of the transition metal species within the multiwalled structure of the tubes does not significantly affect the overall tubula…
Electron interactions reinforce minigaps induced in metallic nanotubes by an external field and turn the gap field dependence into a universal power law. An exactly solvable Gross-Neveau model with an SU(4) symmetry is derived for neutral excitations near half filling. Charge excitations, described by a sine-Gordon pe…
An empirical potential energy function for fluor- and for hydroxyapatite is formulated and parametrised. The parameter optimisation involves a hierarchy of reference data and techniques comprising of quantum-chemical calculations for Coulomb interactions and intramolecular contributions, as well as experimental data a…
Many 'interesting; correlated electron materials exhibit an unusual sensitivity of measured properties to external perturbations, and in particular to imperfections in the sample being measured. It is argued that in addition to its inconvenience, this sensitivity may indicated potentially useful properties. A partial…