Materials Literature
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In the ageing of insulating materials by partial discharges, physical, chemical and electrical factors enter together into play. The paper aims to provide a general overview on the subject, especially for the physical and chemical phenomena, using information obtained from studies carried out with air corona discharge…
The structure of benzene solutions of Ga[GaCl4] and Ga[Ga2Cl7] has been investigated by 13C and 71Ga NMR, Raman spectroscopy and liquid X-ray scattering (LXS). Assignments of the vibrational spectra are based on a reinvestigation of the liquid Ga–GaCl3 system. The results for the Ga[GaCl4]–C6H6 system are in agreement…
This paper reviews recent work on the effect of biaxial stress on magnetic properties obtained from hysteresis loops. Both experimental and theoretical work are discussed. Biaxial stress measurements were performed on SAE-4130 and mild steel cruciform specimens. The theoretical model, applied to polycrystalline steels…
For the near to generator short-circuit analysis, it is well known that a rigorous calculation procedure requires the use of complex dynamic models of power system components. In most practical cases, however, it is sufficient to adopt simplified and standard based calculation methods. For these cases the paper sugges…
Large mirrors are used to concentrate sunlight for renewable power generation. The reflector materials that are used must be inexpensive and maintain high specular reflectance for extended lifetimes in severe outdoor environments. Polymer reflectors are lighter than glass mirrors, offer greater system-design flexibili…
The powder technology characteristics of 3 kinds of Paracetamol powders from different manufacturer were investigated. Their crystal lattices, crystal shapes and the shape coefficients were measured. The compression behaviors were shown that the needle-shaped crystals have greater extent of capping and lamination than…
A new method is presented to interpret steady-state flow experiments for relative permeability and capillary pressure functions eliminating errors caused by the capillary end-effect. This is achieved by retaining the capillary term in the equations that are used to interpret the flow data.
The design of cryogenic, scanning Fabry-Perot interferometers for the Long-Wavelength Spectrometer on the ESA Infrared Space Observatory is presented. The interferometers were designed to provide a spectral resolving power of 10(4) over the wavelength range 45-180 µm, with the highest possible transmission efficiency…
Electrically conducting polymers can be prepared by various routes which will be decisive for the specific properties, e.g. conductivity, solubility, and crystallinity. This article covers the major routes for the preparation of important electrically conducting isopolymers with respect to their properties. Preparatio…
Thermodynamic calculations show, in accordance with experimental investigations, that transition metals in an H2–SiCl4 atmosphere in the temperature range 600–1200 K will react to form metal silicides. With rising temperature, stoichiometry will change in the direction of silicides with a higher silicon content. The s…
Ferroresonant oscillations are unpredictable and their occurrence is of serious concern, predominantly because of possible damage to equipment such as transformers. It is known that by energising the transformer at different points on the voltage wave, ferroresonant oscillations of different types can be induced. A me…
The Heavy-Section Steel Irradiation Program at Oak Ridge National Laboratory is involved in two cooperative projects, with international participants, both of which involve Charpy V-notch impact tests with instrumented strikers of 2-mm and 8-mm radii. Two heats of A 533 grade B class 1 pressure vessel steel and a low…
Spectra of a tight-binding model on square approximants of the quadiperiodic octagonal tiling are calculated for both perfect and phason-randomized tilings. Level statistics for the randomized tilings are given by random matrix theory, while for the perfect tilings a new type of level statistics is found. Their level-…
Studies performed by our group on composition-structure-property relationships of Pb(ZrxTi1−x)O3 (PZT)-based heterostructure capacitors are reviewed. The work discussed is related to the synthesis and characterization of ferroelectric PZT and conductive Pt, RuO2, and La0.5Sr0.5CoO3 layers and their integration into he…
Abstract The length of chain segment motion needed for the crystallization of guttapercha from rubbery state was found to be around 180 CC bonds of the backbone chain. Thus, the crystallization process from the rubbery state or from the melt is not through chain folding, and the solidification model is a more appropr…
Dielectric and conductivity studies have been performed on compacted powders of vanadium pentoxide V2O5 in a broad frequency range 1 kHz–10 GHz, as a function of temperature and density (porosity). The spectra show the existence of relaxation due to grain boundary polarization phenomena. These depend on the synthesis…
Self-assembly of new organic conjugates of the pentamolybdodiphosphonato cage with cyclic aminomethylphosphonates has been achieved. The crystal structures of two of the conjugates have been determined and all of them characterised by IR spectroscopy. Intramolecular hydrogen bonding of the aminomethyl moiety to cage o…
Surface cross-linking of monodispersed, polymer-modified silica particles, which were prepared by reaction of the colloidal silica with poly(maleic anhydride-styrene) silane coupling agent, with di- or tri-ol and di- or tri-amine, and properties of simultaneously formed carboxyl and amino groups were studied. The copo…
Magnetite particles bearing covalently immobilized copper phthalocyanine dye ("blue magnetite") were prepared and used for the sorption of triphenylmethane dyes from aqueous solutions. The binding of some triphenylmethane dyes bearing two or three amino groups (basic fuchsin, crystal violet, malachite green) followed…
A thin cell method for dielectric time domain spectroscopy is described. The cell allows one to study the dielectric dispersion and absorption spectra for both components of the dielectric permittivity tensor of uniaxial systems like nematic and smectic A and B phases. Results are presented for 4-n-pentyl-4′-cyanobiph…