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

Issue 8 • Nov. 1988

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Displaying Results 1 - 15 of 15
  • Whitney forms: a class of finite elements for three-dimensional computations in electromagnetism

    Publication Year: 1988, Page(s):493 - 500
    Cited by:  Papers (133)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (729 KB)

    It has been recognised that numerical computations of magnetic fields by the finite-element method may require new types of elements, whose degrees of freedom are not field values at mesh nodes, but other field-related quantities like, e.g. circulations along edges of the mesh. A rationale for the use of these special 'mixed' elements can be obtained if one expresses basic equations in terms of di... View full abstract»

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  • Comparison of different boundary integral formulations when coupled with finite elements in three dimensions

    Publication Year: 1988, Page(s):501 - 507
    Cited by:  Papers (11)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (655 KB)

    Several boundary integral formulations are described and compared for calculating the 'outside stiffness matrix' for a hybrid finite-element boundary-integral method in three-dimensional (3D) electromagnetic modelling. The methods of single-layer sources and of Green's identity, as well as the Trefftz method, have been analysed when using, respectively, collocation and variational techniques for t... View full abstract»

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  • 'Local' conditioning of broad-area vacuum-insulated high-voltage electrodes

    Publication Year: 1988, Page(s):508 - 514
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (609 KB)

    A new in situ 'local' conditioning technique is described for improving the hold-off capability of a high-voltage vacuum gap. This involves spatially locating individual prebreakdown electron emission sites and then selectively eliminating them by some form of 'zapping' probe. Three types of probe have been evaluated, namely focused ion and electron beams, and needle spark knocking. For OFHC coppe... View full abstract»

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  • Computation of fields due to current sources

    Publication Year: 1988, Page(s):515 - 522
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    In finite-element codes where the magnetic field is split into a reduced magnetic intensity and the gradient of a scalar field, the computational effort spent in calculating the field due to impressed currents can be great. This contribution seeks to show that there are an infinite number of ways of calculating the field due to these currents, and that a proper choice can greatly increase the comp... View full abstract»

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  • Electromagnetism and semantics

    Publication Year: 1988, Page(s):523 - 527
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (638 KB)

    The terminology still in common use by many writers on electromagnetic topics is unconsciously related to the original Maxwell ether model, which gives the E, D, B and H vectors equal status as a set of four fundamental field quantities. Maxwell's equations are usually presented in terms of all four quantities, together with the 'constitutive relationships of the medium'. This is an unnecessarily ... View full abstract»

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  • Knowledge-based project control employing heuristic optimisation

    Publication Year: 1988, Page(s):529 - 538
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (414 KB)

    One particular problem of great commercial significance which professional project engineers confront is that of expeditious control of resources to achieve timely completion of complex plans. A wealth of expertise exists, little if any of which has been formalised, so as to permit the development of computer-based aids for intelligent project control. The authors describe a heuristic algorithm wh... View full abstract»

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  • Research co-operatives: experiences with a small-scale approach

    Publication Year: 1988, Page(s):539 - 540
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (247 KB)

    Small research groups, jointly sponsored by several industrial companies, have been used to address common technological problems at the precompetitive stage. The authors discuss experiences in forming and operating the groups.<> View full abstract»

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  • Whitney forms: a class of finite elements for three-dimensional computations in electromagnetism

    Publication Year: 1988, Page(s):493 - 500
    Cited by:  Papers (54)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (911 KB)

    It has been recognised that numerical computations of magnetic fields by the finite-element method may require new types of elements, whose degrees of freedom are not field values at mesh nodes, but other field-related quantities like e.g. circulations along edges of the mesh. A rationale for the use of these special `mixed¿¿ elements can be obtained if one cxpresses basic equations in terms of di... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison of different boundary integral formulations when coupled with finite elements in three dimensions

    Publication Year: 1988, Page(s):501 - 507
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (822 KB)

    Several boundary integral formulations are described and compared for calculating the `outside stiffness matrix¿¿ for a hybrid finite-element boundary-integral method in three-dimensional (3D) electromagnetic modelling. The methods of single-layer sources and of Green's identity, as well as the Trefftz method, have been analysed when using, respectively, collocation and variational techniques for ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • `Local¿ conditioning of broad-area vacuum-insulated high-voltage electrodes

    Publication Year: 1988, Page(s):508 - 514
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (905 KB)

    A new in situ `local¿ conditioning technique is described for improving the hold-off capability of a high-voltage vacuum gap. This involves spatially locating individual prebreakdown electron emission sites and then selectively eliminating them by some form of `zapping¿ probe. Three types of probe have been evaluated, namely focused ion and electron beams, and needle spark knocking. For OFHC cop... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computation of fields due to current sources

    Publication Year: 1988, Page(s):515 - 522
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    In finite-element codes where the magnetic field is split into a reduced magnetic intensity and the gradient of a scalar field, the computational effort spent in calculating the field due to impressed currents can be great. This contribution seeks to show that there are an infinite number of ways of calculating the field due to these currents, and that a proper choice can greatly increase the comp... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetism and semantics

    Publication Year: 1988, Page(s):523 - 527
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (795 KB)

    The terminology still in common use by many writers on electromagnetic topics is unconsciously related to the original Maxwell ether model, which gives the E, D, B and H vectors equal status as a set of four fundamental field quantities. Maxwell's equations are usually presented in terms of all four quantities, together with the `constitutive relationships of the medium¿¿: This is an unnecessarily... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Book review: Business for Engineers

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (174 KB)
    Freely Available from IEEE
  • Knowledge-based project control employing heuristic optimisation

    Publication Year: 1988, Page(s):529 - 538
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1292 KB)

    One particular problem of great commercial significance which professional project engineers confront is that of expeditious control of resources to achieve timely completion of complex plans. A wealth of expertise exists, little if any of which has been formalised, so as to permit the development of computer-based aids for intelligent project control. The paper describes a heuristic algorithm whi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Research co-operatives: experiences with a small-scale approach

    Publication Year: 1988, Page(s):539 - 540
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (310 KB)

    Small research groups, jointly sponsored by several industrial companies, have been used to address common technological problems at the precompetitive stage. The paper discusses experiences in forming and operating the groups View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.