Materials Literature
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Description 80 peer-reviewed papers address these issues: • Hazards and Methods (including aerosols, physical resistance, biological, chemical, pesticides, and thermal and heat) • Field tests, New tests, Evaluations, Design, Physiological, Performance (including field tests, new and improved tests, evaluations, physio…
An 800 kV gas-insulated switchgear, with a capacity level recognized as the largest in the world, was developed as the first development of UHV gas-insulated switchgear, and good results were obtained in the type tests for this switchgear. With the gas circuit breaker and the disconnector used in this gas-insulated sw…
The impact of the assumptions inherent in using the Mott‐Schottky theory to identify deep‐level electronic states in semiconductors was assessed by comparison to the results of a less restrictive mathematical model. The model, developed in another paper, treated the transport and recombination reactions involving elec…
Poly(3-methylthiophene) films made electrochemically inactive by overoxidation in the presence of Cl– can be reactivated both electrochemically and chemically to produce a partially chlorinated conducting polymer.
Poly(rA) binds poly(rG).poly(rC) to form a triple helix. Evidence for this structure includes ultraviolet absorbance mixing curves and melting curves, and circular dichroism spectroscopy. The formation of the triple helix depends on the length of the poly(rC) strand. Triple helix forms when the average length is aroun…
The behavior of concentrated Brownian suspensions in a linear shear flow is studied numerically. Particle trajectories are calculated by Stokesian dynamics, a molecular‐dynamics‐like method that accurately represents the suspension hydrodynamics, including both many‐body interactions and lubrication. The simulations a…
A detailed mathematical model is presented to investigate the chemical vapor infiltration (CVI) of fiber‐reinforced ceramic composites with a volume‐heating source. Volume heating may be achieved by using microwave power or radio frequency (RF) induction in the case of conductive substrates. The analysis includes a se…
Pure low-molecular-weight mesogenic compounds as well as mesogenic mixtures, able to form glass phases above room temperature, have been investigated by microscopy, calorimetry and X-ray scattering. Indications for two types of short-range order (SRO) in the glassy state have been found. Diffuse low-angle scattering m…
Abstract A new correction method for obtaining quantitative electron probe microanalysis results is described. It utilizes data provided by Monte Carlo simulations and tracer measurements to obtain a detailed picture of the way in which the x‐ray emission process is influenced by the relevant experimental parameters.…
The crystals PbTiO3:Mn have been obtained. The influence of Mn dopant on light absorption, electric conductivity, dielectric permittivity was observed. The defect centers of Mn24, Mn4+, Vo, Fe3+-Vo were determined with EPR test.
The capacitive network often used for the calculation of initial voltage distribution along a transformer winding can be in error for steep impulses. As such pulses are produced by partial discharges (PDs) the application of the concept could contribute to inaccuracies in methods developed for the location of PDs in w…
A method for the parameterisation of molybdenum disulphide is presented which reproduces the crystal structure accurately. The method involves calculating parameters such that there is no net force contribution from any individual term of the potential on any atom. Ideal bond lengths and bond angles are taken from the…
The lattice invariant shear in the β1→γ1′ martensitic transformation in a Cu–Al–Ni alloy is confirmed to be 〈111〉γ1′ Type II twinning by X-ray diffraction and two-surface analysis using single crystals. However, Type II twins have not been observed by electron microscopy in the past. To resolve this conflict, the twin…
A semi-empirical model describing the plane wave shielding effectiveness (SE) of metallized fabrics, both woven and non-woven, has been developed. The model incorporates the plane wave shielding theory of homogeneous metal foils, meshes, and thick perforated metal panels into a formulation for predicting the shielding…
3. A User's Guide to Principal Components. By J. E. Jackson. ISBN 0 471 62267 2. Wiley, New York, 1991. xviii + 570pp. £55.15.
In this paper, computer programs to evaluate kinetic analysis from non-isothermal thermogravimetric data are discussed. The flowcharts for all the programs are shown. These include those based on single-heating-rate and multi-heating-rate procedures. The single-heating-rate methods include the differential and integra…
A method has been developed for screening stator bars and coils using a particular type of partial discharge (PD) detector. The objective in making PD screening tests was to identify those bars or coils which are more likely to fail on voltage endurance in a relatively short time. The majority of the examples given pe…
The low-temperature single-crystal absorption spectrum, far-infrared spectrum and single-crystal structure determination of [Ni(tacn)2][ClO4]2·H2O (tacn = 1,4,7-triazacyclononane) are reported. The compound crystallizes in the monoclinic space group P21/a(Z= 2) with a= 9.614(3), b= 13.451(6), c= 9.648(4)Å and β= 120.1…
Laser-induced multiphoton and SF6-photosensitised decomposition of tetramethoxygermane has been used for chemical vapour deposition of reactive organooxogermanium polymers, which were characterised by IR, VIS, and UV spectra and ESCA and TEM techniques. The properties of the deposited layers differed depending on the…
In view of the limitations inherent to phenomenological approaches, the problem of the internal structure of defects in nematics is here afforded from a molecular viewpoint. By using an extension of the Maier-Saupe mean-field potential which accounts for distorted states of nematics, the general equation applicable in…