Materials Literature
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HVDC cables play an important role in a growing number of HVDC links. For almost all of these cables, mass impregnated paper is used as electrical insulation. The electrical conductivity of this insulation is given by a commonly used empirical formula. This formula takes into account the temperature and stress depende…
A stepwise peroxide initiated degradation of a PRO-FAX reactor grade polypropylene by reactive extrusion was compared with a single step degradation process. Measured properties of the polypropylene and the degraded products included shear and intrinsic viscosity, melt flow index, melting and crystallization temperatu…
Poly(ethylenc terephthalate) (PET) fibres having a wide range of structures and morphologies were prepared by heat-setting commercial PET yarn at fixed temperatures between 100 and 255°C under two conditions, i.e. while the yarn was free to relax and when it was held taut at constant length. The structural and morphol…
As a probe of physical chemical properties of the intracellular environment, we measured 39K NMR transverse relaxation rates in concentrated cell slurries of Escherichia coli K-12 grown in minimal medium over a range of osmolarities (from 0.1 to 1.0 OsM) and after plasmolysis. The 39K transverse relaxation at a resona…
Reaction of octahydridooctasesquisiloxane with Co2(CO)8 in hexane affords the complex [Si8O12H6]{Co(CO)4}2 which on pyrolysis at 300 °C in vacuo gives nanoparticulate Co2C encapsulated in an amorphous siliceous matrix; the magnetic coercivity of this material is 3.5 kOe.
Ge4S9(C3H7)2NH2(C3H7)NH2(C2H5) consists of chains of corner-linked adamantane units with a composition of [Ge4S9]2– which are separated by two dipropylammonium (DPA) cations; the first reported chain-like structure of [Ge4S9]2–.
Among the tens of thousands of species of protists recognized today, a goodly number are known as 'ambiregnal" because of their past treatment both as algae and as protozoa, which caused their names to fall under the jurisdiction of both
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-…