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Electrical Engineers, Proceedings of the Institution of

Issue 11 • November 1973

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Displaying Results 1 - 25 of 38
  • Digital-summation threshold-logic gates: a new circuit element

    Publication Year: 1973, Page(s):1301 - 1307
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (805 KB)

    Threshold-logic gates are memoryless, multiple-binary-input single-binary-output circuits that operate by an arithmetic summation process to determine the 0 or 1 gate output state. The availability of such gates would be of great advantage to digitial system design. A new approach to the circuit realisation of such gates is presented here, i.e. to use digital-summation techniques within the gate c... View full abstract»

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  • Content-addressable memories based on magnetic-domain logic

    Publication Year: 1973, Page(s):1308 - 1314
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1041 KB)

    The paper proposes the implementation of logic into magnetic-bubble memories, and particularly the realisation of a content-addressable data storage. The basic bubble-interactive logic and flip-flop functions are briefly reviewed. This is followed by the discussion of the most suitable memory structure and of the logical requirements for content addressing. Two cellular bubble logic-in-memory arra... View full abstract»

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  • Variable-function logic circuit design with memory elements

    Publication Year: 1973, Page(s):1315 - 1320
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (697 KB)

    A memory element such as a random-access (r.a.m.) may be used as a variable-logic device, the logic function being found between the address terminals and the output. This paper discusses design techniques whereby a single system of such memory elements may be used to implement several logic functions. The question of training or programming such systems is also considered with particular referenc... View full abstract»

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  • Automated system for testing visual fields

    Publication Year: 1973, Page(s):1321 - 1327
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1093 KB)

    An electronic system for automatically testing the human visual field is described in the context of mass screening for visual disorders, such as glaucoma. Present methods of field testing are briefly reviewed. The new system is patient operated and uses a television monitor as the means for presenting the test stimuli and displaying the results. A multilevel map of a patient's retinal sensitivity... View full abstract»

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  • Linear-harmonic generation

    Publication Year: 1973, Page(s):1328 - 1330
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    A linear-harmonic generator is a nonlinear device in which an applied cosine wave of amplitude A causes some harmonic(s) of the input to be generated with amplitude(s) proportional to A. Such devices find application in phase-envelope processing in some types of modulation and speech-transmission systems. The present paper provides a theoretical study of the ability some characteristics have to ge... View full abstract»

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  • Multiserver computer-controlled queuing system with pre-emptive priorities and feedback

    Publication Year: 1973, Page(s):1331 - 1336
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (601 KB)

    The paper is concerned with the investigation of a multiserver computer-controlled queuing system with preemptive priorities and feedback. A formula for the generating function of the state probabilities of the system is derived and a method using the transition probabilities of a Markov chain for determining the first waiting-time distribution in the system is presented. View full abstract»

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  • Intermodulation interference in mobile multiple-transmission communication systems operating at high frequencies (3¿30 MHz)

    Publication Year: 1973, Page(s):1337 - 1344
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1150 KB)

    Nonlinear responses in the transmitters, antennas and surroundings of a mobile multiple-transmission communication system give rise to intermodulation interference to the desired weaker signals at the receiver. The major sources of nonlinearity, for various transmitter configurations such as narrowband and wideband, have been identified. Laboratory-based experiments supporting the field trial work... View full abstract»

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  • Synthesis of a fundamental cutset matrix

    Publication Year: 1973, Page(s):1345 - 1348
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (494 KB)

    A simple and systematic procedure for the synthesis of a fundamental cutset matrix of a nonoriented graph is presented. The synthesis procedure is based on finding a cutset matrix Afs which has the property that a row in Afs corresponding to an incidence set has Vs nonzero entries where Vs corresponds to the number of rows in Afs. The method uses the results obtained by Mayeda and Iri. View full abstract»

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  • Measurements of the input admittance of thick spheroidal antennas in conductive mediums.

    Publication Year: 1973, Page(s):1349 - 1354
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (749 KB)

    A measuring apparatus and experimental procedures have been developed to test the validity of a theoretically derived equivalent-circuit representation of the input admittance of prolate spheroidal antennas immersed in a general isotropic homogeneous medium. The experimental results reported are in excellent agreement with theoretical predictions and validate the possibility of computing antenna r... View full abstract»

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  • Relationship between h.f. absorption at vertical and oblique incidence

    Publication Year: 1973, Page(s):1355 - 1361
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    Calculations are made of the absorption, in model ionospheres, by a phase-integral method, at vertical incidence and by 3-dimensional ray tracing at oblique incidence. The results are used to derive an empirical relationship for the variation of the absorption with path obliqueness, to an accuracy considered adequate for the prediction of the performance of h.f. communication circuits. The relatio... View full abstract»

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  • Modal analysis of triangular-cored glass-fibre waveguide

    Publication Year: 1973, Page(s):1362 - 1370
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1093 KB)

    The modal analysis is given of a new optical glass-fibre waveguide configuration having a core with an equilateral triangular-shaped cross-section. Calculations are based on the point-matching method, which is known to be inaccurate if sharp corners exist in the boundary geometry. In view of this, two numerical methods are derived to check and correct the resulting eigenvalues and their fields. Th... View full abstract»

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  • Propagation behaviour of cylindrical-dielectric-rod waveguides

    Publication Year: 1973, Page(s):1371 - 1378
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (911 KB)

    The exact propagation behaviour is considered of cylindrical dielectric waveguides possessing a central core of higher permittivity than the surrounding cladding. Results are compared with those obtained by making the coremode and cladding-mode approximations. The former approximation is found to be valid for most purposes; the latter is much more restricted. Although the waveguide parameters chos... View full abstract»

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  • Digital-computer-simulation results of multistage delta-modulation systems

    Publication Year: 1973, Page(s):1379 - 1382
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    Digital-computer-simulation results of multistage delta-modulation systems are reported. Considerable improvement in the tradeoff between signal/noise ratio and transmission rate is possible. Results for 2- and 3-stage systems with band-limited flat spectrum and RC-integrated spectrum are given. Significant decrease in the idle-channel noise of the first stage is possible with the help of the seco... View full abstract»

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  • New approach to m.t.i. clutter locking

    Publication Year: 1973, Page(s):1383 - 1390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (975 KB)

    Proposals are made for new techniques, for clutter locking in m.t.i. radar systems, that adapt automatically to rapid variations in the clutter bias velocity with range. The proposed schemes are based upon what is believed to be the novel principle of correcting for the clutter bias velocity after the radar returns have been read-out from the vector canceller stores and demand no additional storag... View full abstract»

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  • IEE Conference Publication 105. Raderߝpresent and future

    Publication Year: 1973
    IEEE is not the copyright holder of this material | PDF file iconPDF (172 KB)
    Freely Available from IEEE
  • IEE Conference Publication 106. Digital instrumentation

    Publication Year: 1973
    IEEE is not the copyright holder of this material | PDF file iconPDF (86 KB)
    Freely Available from IEEE
  • Method of predicting transient-current patterns in transformers

    Publication Year: 1973, Page(s):1393 - 1396
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    The paper describes a method for analysing the transient behaviour of a transformer, taking into account the mutua-coupling between phases and the nonlinearity of the magnetic material. A 3-phase, 3-limb transformer is taken as the basis for illustrating the theoretical analysis, but the method can be applied to any electromagnetic configuration. A selection of calculated and experimental results ... View full abstract»

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  • Arc-quenching transients in h.v. d.c. convertors

    Publication Year: 1973, Page(s):1397 - 1402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (683 KB)

    A mathematical model is described suitable to analyse the transient response of present-day h.v. d.c. convertor stations to arc-quenching disturbances in the main valves and bypass valves. The model is used to determine the voltage stresses at the convertor plant and the effect of valve restrike following the disturbance. View full abstract»

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  • Topological approach to thyristor-circuit analysis

    Publication Year: 1973, Page(s):1403 - 1405
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    In the thyristor-circuit analysis, the open-circuit branches are removed from the associated graph to formulate the modified incidence matrix. An algorithm for the formulation of incidence matrix is presented. On the basis of a normal tree, the state equations are derived. As the open-circuit branches are removed from the graph, the usual problem of widely varying time constants associated with th... View full abstract»

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  • Selection of p.v.c.-insulated cables for 415 V motors in CEGB power stations

    Publication Year: 1973, Page(s):1406 - 1413
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (976 KB)

    The choice of size of power cables for connections between power-station auxiliary motors and associated starters invariably has to be made before precise information on the cable environment and type of drive is available. The paper analyses the various factors that govern the selection of these cables, and offers a synthetic solution to the problem for all conditions normally encountered, so tha... View full abstract»

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  • Discussion on 'Asynchronous starting of synchronous machines with or without rectifiers in the field circuit'

    Publication Year: 1973, Page(s):1414 - 1416
    IEEE is not the copyright holder of this material | PDF file iconPDF (575 KB)
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  • Discussion on "Short-line fault tests on the CEGB 275 kV system"

    Publication Year: 1973
    IEEE is not the copyright holder of this material | PDF file iconPDF (177 KB)
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  • Response of an optimally controlled d.c. transmission system

    Publication Year: 1973, Page(s):1418 - 1419
    IEEE is not the copyright holder of this material | PDF file iconPDF (183 KB)
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  • Reduced-gradient method for economic dispatch

    Publication Year: 1973, Page(s):1419 - 1420
    IEEE is not the copyright holder of this material | PDF file iconPDF (217 KB)
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  • Erratum: Moisture control of cable environment with particular reference to surface troughs

    Publication Year: 1973
    IEEE is not the copyright holder of this material | PDF file iconPDF (105 KB)
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Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

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