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Electrical Engineers, Proceedings of the Institution of

Issue 1 • Date January 1968

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Displaying Results 1 - 25 of 39
  • Inaugural address. The fascination of electrical power engineering

    Publication Year: 1968 , Page(s): 1 - 6
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1164 KB)  

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  • Chairman's address: Electronics Division. Men, circuits and systems in telecommunications

    Publication Year: 1968
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1337 KB)  

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  • Entropy of quantised television signals

    Publication Year: 1968 , Page(s): 16 - 20
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (844 KB)  

    Real-time television signals were recorded on magnetic tape in digital form using an online, time-shared computer. A sampling technique was used to reduce the rate of incoming data, and the data were subsequently analysed to obtain the first- to fourth-order entropies. By inspecting the entropies it is seen that for low-detail pictures most redundancy is associated with the second-order probabilit... View full abstract»

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  • Permutation procedure for minimising the number of crossings in a network

    Publication Year: 1968 , Page(s): 21 - 26
    Cited by:  Papers (7)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (766 KB)  

    The paper describes a method for laying out networks by computer so that the number of crossings between the network connections is close to a minimum. The problem is relevant to the design of printed circuits, where special wiring arrangements have to be made when crossings occur. The network is expressed in the form of a permutation, which is convenient for manipulation, by deforming the network... View full abstract»

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  • Permutation procedure for the backboard-wiring problem

    Publication Year: 1968 , Page(s): 27 - 30
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (454 KB)  

    A general method is described for solving the backboard-wiring problem. This problem is concerned with placing logic elements in an array of positions to minimise some function of the connection pattern such as total wire length. Any placement of the elements can be expressed as a permutation, and the proposed procedure determines a permutation which is optimal with respect to a given set of excha... View full abstract»

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  • Wave propagation in a rectangular waveguide with a semiconducting wall

    Publication Year: 1968 , Page(s): 32 - 36
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (528 KB)  

    Theoretical methods of calculating the propagation coefficient of a rectangular waveguide with a narrow wall of semiconductor are discussed. Numerical solutions for a waveguide with a wall of germanium having resistivity in the range 0.1¿100¿cm have been made at 9.25GHz and confirmed experimentally for resistivities in the range 5¿25¿cm approximately. The technique is useful for the measuremen... View full abstract»

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  • Harmonic generators and detectors for millimetre wavelengths

    Publication Year: 1968 , Page(s): 37 - 42
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (727 KB)  

    Designs of harmonic generators and detectors for several millimetre wavelengths are described, and detailed information is included on crystal and whisker treatments and junction formation. The voltage sensitivities of detectors and the conversion efficiencies of harmonic generators have been measured, and the relative merits of different crystal and whisker materials have been observed. View full abstract»

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  • TEM wave properties of microstrip transmission lines

    Publication Year: 1968 , Page(s): 43 - 48
    Cited by:  Papers (113)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (833 KB)  

    Wave-propagation properties of microstrip transmission lines can be determined accurately if an exact electrostatic-field solution can be found for a pair of charged conductors separated by a dielectric sheet. The latter problem is framed as an integral equation for whose solution simple numerical methods are available. To determine the kernel function of this integral equation, the classical meth... View full abstract»

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  • Synthesis of 4-terminal reactive networks

    Publication Year: 1968 , Page(s): 49 - 56
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (743 KB)  

    A synthesis technique has been developed and a systematic realisation procedure has been presented for a general class of transformerless 4-terminal reactive networks without mutual inductances. The necessary and sufficient conditions for the applicability of this technique have been stated and the relevant theorems proved. With this technique it is possible to realise exactly a general class of f... View full abstract»

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  • Method of synthesis of phase-correcting networks

    Publication Year: 1968 , Page(s): 57 - 67
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1062 KB)  

    A method is presented for determining the transfer functions of phase-corrective networks of both minimum-phase and all-pass types. The method is based on manipulation of a class of polynomials containing one or more variable parameters, which is derived from Bessel polynomials and represents basically an extension of the application of Bessel polynomials and related Bessel functions to solving th... View full abstract»

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  • Electromagnetic behaviour of circular wire loops with arbitrary excitation and loading

    Publication Year: 1968 , Page(s): 68 - 77
    Cited by:  Papers (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (792 KB)  

    A general analysis of circular wire loops with arbitrary electromagnetic excitation and admittance loading is given. The analysis is made in terms of generalised network parameters and is equivalent to previous analyses of particular problems. Some important special cases of the general theory are circular-loop antennas, loaded-loop antennas, circular-loop scatterers and loaded circular-loop scatt... View full abstract»

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  • Circular array providing fast 360° electronic beam rotation

    Publication Year: 1968 , Page(s): 78 - 86
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1214 KB)  

    The paper describes an experimental 16-element circular array and associated receiving system which is capable of forming a fan-beam directional pattern and electronically rotating this pattern through 360°. The receiver operates at a frequency of 427 MHz and a beam rotation rate of 400kHz. The system is designed to study the possible application of this technique to a 360° within-pulse scanning... View full abstract»

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  • Optimum paraboloid aerial and feed design

    Publication Year: 1968 , Page(s): 87 - 90
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (482 KB)  

    A computer study was made of the spillover, crosspolarisation and illumination efficiency of paraboloids of various focal-length/paraboloid-diameter (F/D) ratios, fed by rectangular, square and circular wave-guides in their lowest-order modes. The feed radiation patterns used were those derived by simple diffraction theory from the incident waveguide-mode field distribution. The approximations mad... View full abstract»

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  • Design and measurement of a portable low-noise aerial

    Publication Year: 1968 , Page(s): 91 - 93
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (467 KB)  

    In order to investigate the reduction of aerial noise from a small dish with its mainbeam at a low elevation, a 112cm-diameter circular symmetric paraboloid was mounted with a 45° flat plate. The combination was fed so that when the mainbeam was horizontal the feed spillover was predominantly upward. A Dicke-type radiometer is described with synchronously switched i.f. attenuators and a resolutio... View full abstract»

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  • Scattering from hollow conducting cylinders

    Publication Year: 1968 , Page(s): 94 - 99
    Cited by:  Papers (11)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (699 KB)  

    The paper deals with reradiation from the interior of cylindrical conducting structures of finite length and arbitrary termination. Expressions are developed for far fields at points in the principal plane. For rectangular cross-sections this plane is one containing a broad side of the structure, whereas for circular cross-sections it is a plane containing the longitudinal axis of the structure. I... View full abstract»

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  • Mersey and North Wales Centre: Chairman's address. Thermistors

    Publication Year: 1968 , Page(s): 100 - 102
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (339 KB)  

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  • Chairman's address: Power Division. Power plant for the 1970s

    Publication Year: 1968 , Page(s): 103 - 113
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1607 KB)  

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  • Transient response and transient stability of power systems

    Publication Year: 1968 , Page(s): 114 - 120
    Cited by:  Papers (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (685 KB)  

    The paper presents a case for correlating transient response with transient-stability limit of power systems. An elementary power system provided with fast acting voltage regulators using various feedback signals is analysed in detail. The effect of varying regulator gains on transient response is investigated with the help of gain-locus diagrams on a gain plane. The Runge-Kutta method with fourth... View full abstract»

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  • Load-flow calculation using loss-minimisation techniques

    Publication Year: 1968 , Page(s): 121 - 127
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (922 KB)  

    Loss-minimisation techniques applied to load-flow analysis form an effective means of obtaining a desirable voltage solution. In addition, the method offers improvement in convergence, which is especially important for networks which give rise to ill conditioned equations. The described method uses the nodal-impedance matrix and minimises that part of the total real-power losses which depends on t... View full abstract»

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  • Discussion on transient effects in induction motors

    Publication Year: 1968 , Page(s): 128 - 135
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  • Synthetic testing under short-line fault conditions. Comparison tests using an air-blast circuit breaker

    Publication Year: 1968 , Page(s): 136 - 140
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (599 KB)  

    The paper is a contribution to work on the problem of synthetic testing under short-line fault conditions. Traditional `current-injection¿ circuits for terminal faults have already been extended to the case of the short-line fault by various authors. The circuit which is proposed in the paper accurately reproduces an actual short-line fault occurring in a network under most general conditions. Th... View full abstract»

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  • Discriminative performance of distance protection under fault operating conditions

    Publication Year: 1968 , Page(s): 141 - 152
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1299 KB)  

    The paper is devoted to an evaluation in detail of the protection coverage afforded by earth- and phase-fault distance relays in terms of the range of apparent impedances presented to them for which the protection correctly operates and initiates circuit-breaker tripping. This requires a knowledge of both the effective polar characteristics of relays for specified system-fault conditions and also,... View full abstract»

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  • Deep-sea cable-gland system for underwater vehicles and oceanographic equipment

    Publication Year: 1968 , Page(s): 153 - 157
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (916 KB)  

    Until recent years, the problem of penetrating a pressure bulkhead with an electric cable was a simple matter, as the pressure differential was never more than a few hundred pounds per square inch. Simple packed glands were developed which served adequately at the low pressures involved, but, as the pressure differential became higher, the limitations of the simple gland became apparent. With the ... View full abstract»

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  • Tests in Japan on the performance of salt-contaminated insulators in natural and artificial humid conditions

    Publication Year: 1968 , Page(s): 158 - 168
    Cited by:  Papers (9)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1151 KB)  

    The paper describes experimental work carried out at the Shiobara Laboratory on the performance of salt-contaminated insulators in both natural and artificial humid conditions. The purpose was to analyse, in relation to humidity, one type of flashover mechanism caused by salinity deposited on a porcelain surface and absorbed moisture in humid conditions. For natural humid conditions, dew, fog and ... View full abstract»

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  • Discussion on ¿Canals as cable routes¿

    Publication Year: 1968 , Page(s): 169 - 178
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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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