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Electrical Engineers, Proceedings of the Institution of

Issue 5 • Date May 1964

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Displaying Results 1 - 23 of 23
  • Realisation of fourth-order rational transfer functions with adjustable coefficients

    Publication Year: 1964 , Page(s): 877 - 882
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (489 KB)  

    Design techniques are described for the simulation of third-order and fourth-order rational transfer functions with adjustable coefficients. The realisation procedure, which is based on the use of an ideal computing amplifier associated with linear passive RC two-port networks, is an extension of the methods described previously for quadratic functions. View full abstract»

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  • Transfer-function synthesis with nonreciprocal constant-resistance two-port networks

    Publication Year: 1964 , Page(s): 883 - 890
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (731 KB)  

    The conventional method of transfer-function synthesis, which employs the passive symmetrical lattice network satisfying the constant-resistance driving-point condition, is applied to a nonreciprocal active network. This network has lattice-like properties, including the non-minimum-phase feature, even though it is unbalanced, thereby avoiding the problem of lattice-to-ladder conversion. A greater... View full abstract»

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  • Network synthesis using negative-impedance convertors

    Publication Year: 1964 , Page(s): 891 - 906
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1657 KB)  

    The paper presents an introduction to existing methods of network synthesis which use active components. A detailed development of Linvill's method, using a negative-impedance convertor, is given. The advantages of using restricted solutions of the approximation problem are discussed, and are illustrated by practical examples. Emphasis is placed on minimising the sensitivity of the response of the... View full abstract»

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  • Scattering by a sphere

    Publication Year: 1964 , Page(s): 907 - 916
    Cited by:  Papers (23)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1039 KB)  

    If a plane electromagnetic wave is incident on a perfectly conducting sphere of large radius, the scattered field can be expressed as a sum of optics and creeping-wave terms. The appropriate formulas are derived and the results are presented in a form suitable for computation. View full abstract»

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  • Differential amplifier based on the feedback pair

    Publication Year: 1964 , Page(s): 917 - 920
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (333 KB)  

    A transistorised differential amplifier based on the feedback pair is described. A preliminary analysis is given and the results are compared with measurements over the frequency range 15kc/s¿30Mc/s. At the centre of the band the common-mode rejection ratio was 270 : 1. The effects of resistor tolerances and the accurate balancing of the two input impedances are discussed. View full abstract»

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  • Heating effect of an electron beam impinging on a solid surface, allowing for penetration

    Publication Year: 1964 , Page(s): 921 - 930
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1111 KB)  

    The heating effect of an electron beam, under the assumption that the entire beam energy is imparted to the target surface (disc heating model), can be calculated fairly readily. At the high voltages and small beam diameters employed in electron-beam machining, however, the problem is complicated by penetration of electrons into the target. This effect is allowed for by a simple model of electron ... View full abstract»

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  • Transmission performance assessment for telephone network planning

    Publication Year: 1964 , Page(s): 931 - 940
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1439 KB)  

    Transmission planning of a switched telephone network consists largely of allocating losses, and other degradations of conversation, to the various elements that will be associated to form tandem connections. Even a given number of trunk circuits linked in tandem will yield a distribution of overall reference equivalent for different calls owing to unavoidable random variations and to the distribu... View full abstract»

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  • Statistical properties of speech signals

    Publication Year: 1964 , Page(s): 941 - 949
    Cited by:  Papers (13)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1081 KB)  

    Statistical information is needed concerning the important properties of speech signals so that problems, such as those of amplifier loading, quantisation, companding, voice switching and echo suppression can be properly analysed. The following headings are used: Conversation statistics. The participants emit speech in relatively short utterances, averaging about 1 sec in duration, and alternate t... View full abstract»

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  • Radiation field produced by an infinite slot in an infinite cylinder surrounded by a homogeneous plasma sheath

    Publication Year: 1964 , Page(s): 950 - 958
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (942 KB)  

    The radiation properties of a slotted cylindrical antenna surrounded by a homogeneous plasma sheath have been investigated. The slot is axial and extends along the entire length of the cylinder, and it is fed by a voltage of constant magnitude and phase. The antenna is insulated from the plasma by a thin dielectric coating. General expressions for the field components are derived and then simplifi... View full abstract»

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  • Radio noise due to insulator corona

    Publication Year: 1964 , Page(s): 959 - 966
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1123 KB)  

    Radio noise due to corona discharges on suspension insulators is studied as influenced by atmospheric humidity, insulator-surface pollution and harmonic contents in the alternating-voltage wave applied across the insulator. The radio-noise level is also measured under direct-voltage conditions. The tests are carried out in humidities between 10 and 38 g/m3 at temperatures between 15 and 38°C. Alt... View full abstract»

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  • Naturally occurring thermal radiation in the range 1¿10 Gc/s

    Publication Year: 1964 , Page(s): 967 - 979
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1590 KB)  

    The paper consists of a review of recent work in the field of aerial noise at microwave frequencies, together with the author's detailed estimates of the resulting noise temperature of an aerial caused by direct radiation from atmospheric oxygen and water-vapour, direct radiation from the ground and indirect radiation from the atmosphere via the ground, for frequencies in the range 1?10Gc/s. Three... View full abstract»

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  • Discussion on ¿Some properties of Van Atta arrays and the use of 2-way amplification in the delay paths¿

    Publication Year: 1964 , Page(s): 980 - 982
    Save to Project icon | PDF file iconPDF (457 KB)  
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  • An active Van Atta array

    Publication Year: 1964 , Page(s): 982 - 984
    Cited by:  Papers (1)
    Save to Project icon | PDF file iconPDF (284 KB)  
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  • Flashover mechanism of polluted insulation

    Publication Year: 1964 , Page(s): 985 - 990
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (718 KB)  

    When a leakage current flows over the wet polluted surface of an insulator, high-resistance dry bands form. Discharges across these dry bands usually become extinguished but, exceptionally, may develop into a flashover of the insulator. The formation of dry bands and the subsequent growth of discharges on the polluted surface of a flat-strip insulator have been studied by scanning the voltage dist... View full abstract»

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  • Artificial-pollution test for high-voltage outdoor insulators

    Publication Year: 1964 , Page(s): 991 - 998
    Cited by:  Papers (10)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1026 KB)  

    A new method of measuring the performance of an insulator subjected to pollution has been developed. A saline fog is produced in which the insulator will flash over at its working voltage. By reducing the salinity of the aqueous solution used for the fog, the maximum value at which the insulator will not flash over is obtained. This salinity is taken as the criterion of performance, and comparison... View full abstract»

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  • American practice in d.c. insulation testing

    Publication Year: 1964
    Save to Project icon | PDF file iconPDF (160 KB)  
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  • Stray losses in squirrel-cage induction motors

    Publication Year: 1964
    Save to Project icon | PDF file iconPDF (96 KB)  
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  • Influence of soil-moisture migration on power rating of cables in h.v. transmission systems

    Publication Year: 1964 , Page(s): 1000 - 1016
    Cited by:  Papers (15)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2080 KB)  

    The paper is primarily concerned with the limitations on power ratings of transmission cables imposed by migration of moisture¿on the presence of which effective thermal dissipation usually depends¿owing to heat from the cables when operated at continuous full load during dry periods. The influence on cable operation of change in function of the British Grid and accompanying changes in load patt... View full abstract»

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  • Characteristics of soil affecting cable ratings

    Publication Year: 1964 , Page(s): 1017 - 1039
    Cited by:  Papers (13)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2328 KB)  

    The paper gives an account of extensive co-operative field studies of the thermal properties of soils in relation to the performance of buried cables. It describes tests made during the past seven years on cables under controlled loading conditions in various types of natural and imported soils at 16 sites in the south of England. The part played by soil moisture is discussed and the influence of ... View full abstract»

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  • Excitation of large turbogenerators

    Publication Year: 1964 , Page(s): 1040 - 1048
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1279 KB)  

    The classic arrangement of a direct-driven d.c. exciter has proved, in general, a reliable, economic and satisfactory source of excitation supply for turbogenerators of moderate output. With increasing rating of individual units, the excitation power required exceeded that practicable for a direct-coupled d.c. machine and gearing was introduced to permit operation at a lower speed. These two facto... View full abstract»

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  • Investigation of gas discharges with a rotational component

    Publication Year: 1964 , Page(s): 1049 - 1058
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1451 KB)  

    The presence of circulating currents in a plasma, i.e. currents that close back on themselves entirely within the plasma, has been demonstrated experimentally and a theory evolved to explain this. The apparatus, which behaves as a plasma gun, produces a discharge in hydrogen at 4¿19 ¿mHg in an axial magnetic field of 480Gs and in the radial electric field set up by six anodes and one central cat... View full abstract»

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  • Factors controlling the performance of cascade rectifier circuits

    Publication Year: 1964 , Page(s): 1059 - 1067
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (833 KB)  

    A method is derived of distributing the stage capacitances of a single-phase cascade generator which minimises the output ripple caused by load current. The design of a generator must also take account of the voltage-regulation characteristic, and a procedure is outlined for optimising the generator performance. The characteristics of symmetrical cascade generators are analysed, and a new fullwave... View full abstract»

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  • Magnetostatic field of electric currents

    Publication Year: 1964 , Page(s): 1068 - 1074
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (832 KB)  

    The relationship between the magnetic scalar potential and an electric-current sheet is examined. It is shown that any magnetostatic field in a source-free region of space can always be produced by an electric current flowing on any smooth, closed surface bounding the region. This has an interesting application in the perturbation of a magnetostatic field by a perfectly conducting body. It is show... 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.

Full Aims & Scope