IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education

Issue 6 • Nov. 1990

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Displaying Results 1 - 12 of 12
  • Finite-element modelling of high-frequency electromagnetic problems with material discontinuities

    Publication Year: 1990, Page(s):313 - 320
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (708 KB)

    A weighted residual formulation, suitable for finite-element application, is given for the general high-frequency time-harmonic electromagnetic problem presented by a lossy anisotropic inhomogeneous boundary driven linear system. Either of the dual field vectors H or E may be chosen as the working variable. New light is thrown on the difficulties arising in finite-element analysis when components ... View full abstract»

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  • Geometrical formulation for variational electromagnetics

    Publication Year: 1990, Page(s):321 - 330
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (742 KB)

    The choice of co-ordinates in the calculation of electromagnetic fields is difficult because the direction of the field varies from point to point. It is, therefore, desirable to use methods which are co-ordinate-free and are based on geometry rather than algebraic equations. Variational methods are particularly appropriate for systems dealing with geometrical objects having varying curvature. suc... View full abstract»

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  • Asynchronous dielectric induction motor

    Publication Year: 1990, Page(s):331 - 338
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    A small electrostatic induction motor has been constructed, consisting of a cylindrical stator with 24 bars, forming eight pitches of three bars each, adjacent bars being connected in sequence to the lines of a three-phase 50 Hz voltage supply of 1400 V/sub RMS/ line-to-line. A rotor consisting of a hollow cylinder of polyvinylchloride, the inside surface of which is coated with a thin layer of gr... View full abstract»

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  • Electrification of an isolated spherical object in the presence of an ion-flow field and air stream

    Publication Year: 1990, Page(s):339 - 345
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (417 KB)

    The charge carrier motion around an isolated spherical object, in the presence of an electric field and an air stream crossing with the arbitrary angle in three dimensions, is analysed. Most analyses on charge carrier motion have mainly been conducted in two dimensions. The phenomena that cannot be simulated in two dimensions are not understood in detail. The model and the calculated result, on ex... View full abstract»

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  • New method for permittivity and conductivity inversion of discrete layered earth

    Publication Year: 1990, Page(s):346 - 348
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    The authors present a method for inverting the permittivity and conductivity of systems of discrete layered media, where each individual layer is isotropic, homogeneous and characterised by its own permittivity and conductivity; the method also determined the physical thicknesses of individual layers. Compared to other methods hitherto introduced by different authors, the method is more accurate a... View full abstract»

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  • Use of simplex co-ordinates in dual finite-element calculations of Poissonian magnetic field problems

    Publication Year: 1990, Page(s):349 - 355
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    A method based on properties of simplex co-ordinates is proposed to be used in dual finite-element calculations in magnetostatics. The method considers the source's distribution within the field region and the interelement boundary conditions. The provision of upper and lower bounds, in connection with the obtained high rate of convergence, makes the method extremely powerful and flexible. The sim... View full abstract»

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  • Ultrasonic detection of insulation degradation

    Publication Year: 1990, Page(s):356 - 360
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    The application of ultrasonic nondestructive testing technique to the detection of insulation degradation has been investigated in a variety of polyester samples. Some samples contained inclusions such as needles and small steel ball-bearings. The pulse-echo ultrasonic mode was easily able to detect these inclusions by reflections from them. Reflections were also detected from electrical trees and... View full abstract»

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  • Role of venture capital in the UK electronics industry

    Publication Year: 1990, Page(s):361 - 364
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    The paper gives an introduction to the role of venture capital in facilitating the development of small entrepreneurial companies, providing products or services based on applied technology and electronics. Statistics on the UK venture capital industry show that UK know-how is well in advance of Europe as a whole, but ventures based on electronics have underperformed other sectors of the market, a... View full abstract»

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  • Satway: an analogue electronic circuit design teaching exercise

    Publication Year: 1990, Page(s):365 - 370
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    The object of the satway exercise is to give students experience of designing and building analogue electronic circuits using discrete components. It has been designed as a contribution to the EA2 requirements of the Engineering Council and is undertaken by every third-year student on the four year BEng degree in electronics and electrical engineering at the University of Edinburgh. The exercise i... View full abstract»

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  • Contribution to the teaching of wave mechanics to students of electronic engineering

    Publication Year: 1990, Page(s):371 - 375
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (433 KB)

    The traditional method of introducing wave mechanics to undergraduates is via the Schrodinger equation. This subject appears in a new light when the wave equation is avoided, and all the important results can be derived without using the Schrodinger equation. This approach gains simplicity and insight at the ultimate expense of generality. Examples, including a simplified treatment of Zener diodes... View full abstract»

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  • Simple method for calculating I/sup 2/t rating

    Publication Year: 1990, Page(s):376 - 378
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (148 KB)

    The behaviour of fuses and power semiconductors at transient overload can be well characterised by the I/sup 2/t rating. The author gives an approximate and easy-to-use method for calculating I/sup 2/t rating. To apply this method, only the broken-line envelope of the amplitude density function has to be known.<<ETX>> View full abstract»

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  • Numerical simulation of power circuits using transmission-line modelling

    Publication Year: 1990, Page(s):379 - 384
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    The authors presents a technique for the simulation of power circuits. This technique allows a direct model in the discrete time domain to be derived from the simulated system. Electrical components including switching devices are modelled in a discrete manner, using the transmission-line modelling (TLM) method. The TLM algorithm provides an exact solution to the discrete model. Errors come from t... View full abstract»

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Aims & Scope

Published from 1989-1990, IEE Proceedings A contained significant and original contributions on physical science, measurement and instrumentation, management and education, together with topics of general interest to electrical engineers.

Full Aims & Scope