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IEE Proceedings A - Science, Measurement and Technology

Issue 4 • Date July 1992

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Displaying Results 1 - 10 of 10
  • Conditions for coalescence of multiple electric discharges

    Publication Year: 1992, Page(s):210 - 212
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (191 KB)

    Separate and coalesced electric discharges have been studied and the conditions for coalescence analysed. The discharges coalesce to operate at the minimum voltage, if this is not a minimum they will remain uncoalesced. The results are supportive evidence for Steenbeck's minimum potential principle. A model of a coalesced discharge is proposed and the principle conditions necessary for coalescence... View full abstract»

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  • Electromagnetic field energy containment

    Publication Year: 1992, Page(s):137 - 140
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB)

    An electromagnetic virial relation in cylindrical geometry is derived which shows that limits on field energy containment imposed by the tensile strength of containment structures can be circumvented. The result is illustrated by two possible machines for which there is a much weakened theoretical virial constraint on the containment of field energy and which should be practically realisable with ... View full abstract»

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  • Criterion for the performance analysis of synchronous and asynchronous sampling instruments based on nonlinear processing

    Publication Year: 1992, Page(s):141 - 152
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (908 KB)

    The authors propose a criterion for the comparison of different sampling strategies (synchronous, asynchronous and random) and filtering algorithms used in digital instruments which provide the estimate of the time average of a signal processed with a nonlinear conversion of multiple inputs (e.g. wattmeters, RMS voltmeters, . . .). This criterion uses the Bayesian approach to incorporate, for ever... View full abstract»

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  • Chronic disease management supported by informatics: example diabetes

    Publication Year: 1992, Page(s):153 - 160
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (748 KB)

    The management of chronic health care conditions already consumes more than half of all health care expenditure in developed countries. The author describes the investigations made by the Eurodiabeta Consortium with regard to diabetes, a life-long condition affecting more than 2% of the population. Partly funded by the European Community's Advanced Informatics in Medicine (AIM) framework programme... View full abstract»

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  • Photoacoustic and photothermal deflection spectroscopy of semiconductors

    Publication Year: 1992, Page(s):161 - 168
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (637 KB)

    Photothermal techniques have been widely used for the determination of light absorption spectra of semiconductors, the main reason being the possibility of successfully measuring the weak absorption in the subgap region. The authors present and discuss the most relevant applications, particularly in the field of thin films of amorphous semiconductors.<> View full abstract»

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  • Influence of space charge on field emission of electrons from sharp edges

    Publication Year: 1992, Page(s):169 - 173
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    A sharp-edged cathode and its adjacent anode are represented as a section of a pair of coaxial cylinders with an inner radius r/sub 0/ and an outer radius r/sub 1/. The field emission current density J is determined as a function of the anode voltage V/sub 1/ and the cathode work function potential phi for degrees of space-charge that lead to a cathode field E in the range 0.9 E/sub 0/ View full abstract»

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  • Potential gradient measuring device based on a partial method

    Publication Year: 1992, Page(s):174 - 178
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (470 KB)

    The author presents a new method for measuring the potential above the remote-earth potential gradient of electric power plants. The advantage of the method is that there is no need for a galvanic connection between the measured item and the measuring device thereby avoiding any exposure to dangerous potentials that might otherwise be transferred from the measured item during the measurement.< View full abstract»

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  • Current shunts and resistors in use in NAMAS accredited laboratories

    Publication Year: 1992, Page(s):179 - 181
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (229 KB)

    Criteria are described for the design and construction of resistors and current shunts to be used in the measurement of direct and low frequency currents. Guidance is given on the methods of use, precautions necessary and sources of uncertainty.<> View full abstract»

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  • Statistical process control in PCB manufacture: what are the lessons?

    Publication Year: 1992, Page(s):182 - 188
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (696 KB)

    A number of printed circuit board (PCB) manufacturers perceive that they face difficulties in the application of statistical process control (SPC). The difficulties include the product characteristics and process parameters to be measured and charted, the mix of different manufacturing technologies, the inherent variability of the chemistry used in the process, the interconnecting nature of the pr... View full abstract»

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  • Electromagnetic theory without electric flux

    Publication Year: 1992, Page(s):189 - 209
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2079 KB)

    Whereas, to the physicist, the electric field in space is completely described by the field vector E, engineers commonly add the flux density, or displacement vector D as a separate quantity, and many regard the SI units as endorsing the need for two different vectors. The author examines the practical implications of a treatment which makes the concept of electric flux unnecessary, by concentrati... View full abstract»

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