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Electrical Engineers, Proceedings of the Institution of

Issue 7 • July 1974

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Displaying Results 1 - 25 of 54
  • Dipole-mode propagation in hollow tubular waveguides

    Publication Year: 1974, Page(s):537 - 540
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (593 KB)

    Guided dipole-mode propagation is best known in its role as a surface wave supported by a dielectric rod isolated in space. A development of that arrangement consists in the provision of an outer coaxial surface satisfying the boundary conditions at a finite radius. The field is found to take the form of a dual-dipole mode comprising a counterpart field on the inside of the outer surface. A furthe... View full abstract»

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  • Pulse response of interconnections in silicon integrated circuits

    Publication Year: 1974, Page(s):541 - 547
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    A direct computation method is derived for analysis of metal-insulator-silicon microstrip structures and yields results in good correspondence with experimental work. This is extended to predict the performance of integrated-circuit interconnection geometries. High-resistivity silicon, despite the higher series loss, gives rise to faster lines, and there is a `critical resistivity¿ dependent on l... View full abstract»

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  • Initial time-varying flow in the smooth-bore magnetron

    Publication Year: 1974, Page(s):548 - 550
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    A computer program has been written to study the flow pattern at the switching on of a 2-dimensional smooth-bore magnetron. Time-variation and multistream flow are allowed. The results suggest that a simple single-stream flow cannot be established, but that either a double-stream or a multistream flow is established. View full abstract»

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  • Computer-controlled queuing system with switching network and general service times

    Publication Year: 1974, Page(s):551 - 554
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (443 KB)

    The paper presents a detailed study of a computer-controlled queuing system with a Poisson distribution input, first-come first-served queue discipline, single server with general service times and switching network through which the establishment of connection between customer in the queue and the idle server is subject to blocking. A generating function for the probability of queue size and a ne... View full abstract»

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  • Class of linear binary codes

    Publication Year: 1974, Page(s):555 - 558
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    A class of algebraic linear codes is introduced in which the parity-check matrix of the code is constructed by using a subset of the Abelian group of Walsh functions. These codes meet the Helgert and Stinaff upper bounds on minimum Hamming distance, and all the codes of this class are easily decodable by a one-step majority-logic algorithm. View full abstract»

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  • Translation of a circuit matrix into the incidence matrix of a network

    Publication Year: 1974, Page(s):559 - 560
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (251 KB)

    A 2-stage pseudo-Boolean programming scheme is constructed to find all the networks, the circuits of which are determined by a given circuit matrix. An illuminating example is given. View full abstract»

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  • Different forms of the Hilbert transform as applied to digital filters and sequences

    Publication Year: 1974, Page(s):561 - 567
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (678 KB)

    The paper presents two aspects of the Hilbert transform; first, a unified survey and treatment of the different forms of the Hilbert transform which arise in the study of digital signal processing systems when considering: (a) the frequency-domain relations between the real and imaginary components of the network function of a linear stable digital filter whose impulse response is causal, and (b) ... View full abstract»

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  • Iterative synthesis of low-sensitivity RC earthed networks

    Publication Year: 1974, Page(s):568 - 572
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (621 KB)

    The possibility of using digital computers and the existence of very convenient technological procedures for constructing RC earthed networks makes it very interesting to have methods available that are capable of taking full advantage of these possibilities. The method proposed in the paper represents an attempt to do this. It is based on an iterative procedure, which directly synthesises an assi... View full abstract»

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  • Numerical methods for antenna problems

    Publication Year: 1974, Page(s):573 - 582
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1508 KB)

    An account is given of some of the integral equations that can be devised for an antenna on whose surface the tangential electric intensity is prescribed. Some of the problems that can arise in numerical work from the formulation of the integral equations and their possible lack of uniqueness are described. Numerical methods of tackling integral equations are given, together with a survey of their... View full abstract»

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  • Subjective quality of television pictures impaired by short-delay echo

    Publication Year: 1974, Page(s):583 - 593
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1664 KB)

    Quality-grading tests have been made on the effect of an undistorted echo of positive or negative polarity and with delay in the range 200¿1300 ns, in a 625-line monochrome television system. The results apply also to the effect on the luminance component of a colour signal. It was found simplest to express echo magnitude in terms of the magnitude of signal plus echo. A logistic relationship betw... View full abstract»

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  • Subjective assessment of flicker in visual-telephone pictures

    Publication Year: 1974, Page(s):594 - 600
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1162 KB)

    Subjective tests have been made of the effect of the 100 Hz modulation, caused by 50 Hz lighting, on the pictures displayed by two visual telephone systems of equal bandwidth and line frequency, but differing picture frequencies. In a 50 fields/s 319-line system the flicker due to the modulation is normally at a rate of less than one per second and much less objectionable than the inherent flicker... View full abstract»

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  • Erratum: Rainfall crosspolarisation at microwave frequencies

    Publication Year: 1974
    IEEE is not the copyright holder of this material | PDF file iconPDF (130 KB)
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  • Erratum: Linear antenna arrays with broadened nulls

    Publication Year: 1974
    IEEE is not the copyright holder of this material | PDF file iconPDF (130 KB)
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  • Power-system model for large frequency disturbances

    Publication Year: 1974, Page(s):601 - 608
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (929 KB)

    The paper describes a mathematical model for studying power-system frequency control. The model provides the basis for economical calculation of frequency transients of up to ten minutes' duration, enabling problems associated with the dynamic balance of generation and load to be studied. The use of test results to establish confidence in the model is described. An account is given of two recent a... View full abstract»

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  • Estimation of maximum demand on a British electricity-board system. Forecast periods of 1-3 years

    Publication Year: 1974, Page(s):609 - 615
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (770 KB)

    The paper is concerned with the forecasting of maxium demand (m.d.) on an area board (or Central Electricity Generating Board Region) system where forecast periods of 1-3 years are important for planning the amount of, and the timing of, capital expenditure. A causal model is sought that gives a good fit to the historical data of recorded m.d. and a satisfactory performance in prediction. The prim... View full abstract»

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  • Analysis of ferro-oscillations in power systems

    Publication Year: 1974, Page(s):616 - 622
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (796 KB)

    The paper presents an analysis of ferro-oscillations in capacitor voltage transformers and series-compensated e.h.v. lines. The dual-input describing function is adopted to show the regions of existence and the influence of system parameters on such oscillations. A complete analytical method suitable for digital computation has been developed for determining the amplitudes of these oscillations. View full abstract»

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  • Stability analysis of power systems using Lie series and pattern-recognition techniques

    Publication Year: 1974, Page(s):623 - 629
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (825 KB)

    This paper concerns the estimation of stability domains for transient stability problems in power systems. Lieseries methods are used for generating a solution to Zubov's partial differential equation and pattern recognition algorithms are applied to obtain the boundary defining a region of stability. Critical clearing times for representative problems are obtained using the analytical expression ... View full abstract»

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  • Newton-Raphson algorithm for 3-phase load flow

    Publication Year: 1974, Page(s):630 - 638
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (969 KB)

    One of the problems encountered in power-systems operation is the generation of unbalanced voltages and currents in the presence of long transmission lines with few or no transpositions, including possible unbalances arising in source and load conditions, or indeed any items of plant such as shunt and series reactors. To improve or investigate these unbalance effects in any detail, a 3-phase-load-... View full abstract»

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  • Diakoptics in node-to-datum analysis. An approach from linear graph theory

    Publication Year: 1974, Page(s):639 - 644
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    The diakoptic equation and techniques are derived in a simple manner using only the basic electrical laws, simple linear-graph theory and elementary matrix algebra. A technique is presented for dealing with multiple coupling between elements in the links and main network. View full abstract»

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  • Availability of generating units operated discontinuously

    Publication Year: 1974, Page(s):645 - 646
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (266 KB)

    Some of the important aspects for reliability assessment of power systems are outlined to quantify a desired security level. This quantification eliminates subjective guesswork, and enables efficient prediction of future operating conditions.This requires simple and computationally efficient models. A realistically efficient availability model of a generator unit operated in a 5-state discontinuou... View full abstract»

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  • Induced field-system transients in synchronous generators having unidirectional forms of excitation supply

    Publication Year: 1974, Page(s):647 - 652
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (706 KB)

    Synchronous-generator excitation supply systems that are based on a.c. exciters operating in conjunction with rectifiers, as is now widely the practice, give rise to particular modes of generator operation that do not occur when d.c. exciters are used. In the case of a d.c. exciter, the field current can reverse, if it is required so to change by stator operating conditions, whereas an a.c. excite... View full abstract»

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  • Calculation of magnetic fields in the end regions of turbogenerators

    Publication Year: 1974, Page(s):653 - 656
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (559 KB)

    To solve the Poisson equations for the vector potential within the end region of a turboalternator, a method based on eigenfunction expansions is proposed. Use of this method allows the effects of the shaft, outer casing and rotor endbell to be approximately represented. In addition, the effects of the stator and rotor core ends can be incorporated by means of the introduction of an airgap current... View full abstract»

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  • Residual unbalance in symmetrised windings

    Publication Year: 1974, Page(s):657 - 662
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (700 KB)

    Polyphase symmetrisation is a new geometrical process for obtaining balanced fractional-slot (irregularly distributed) windings. Practical polyphase windings cannot always comply exactly with the ideal geometry. The paper shows how to calculate the very small residual unbalance, where any exists, with particular reference to 2-speed p.a.m. windings. View full abstract»

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  • Steady-state stability criterion for induction motors

    Publication Year: 1974, Page(s):663 - 667
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (581 KB)

    The instability of induction motors has been widely observed when operating on variable-frequency supplies, particularly on light loads at low speeds. This phenomenon is analysed for steady-state conditions using the single-phase equivalent circuit of the motor and considering a stable system to have constant-power balance. The analysis confirms the low frequency, low-slip instability and predicts... View full abstract»

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  • Transient voltages generated by inductive switching in control circuits

    Publication Year: 1974, Page(s):668 - 676
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1195 KB)

    In certain control applications a common d.c. supply is used for both electronic and electromechanical equipment. In this situation semiconductor devices may be subjected to transient voltages generated by the operation of mechanical switches in inductive circuits. This paper describes the factors involved in the generation of such transients and methods for predicting their time duration are prop... View full abstract»

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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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