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Radio Engineers, Journal of the British Institution of

Issue 6 • Date December 1962

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Displaying Results 1 - 11 of 11
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  • The control of nuclear power reactors by means of magnetic amplifiers

    Page(s): 427 - 439
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1355 KB)  

    Magnetic amplifiers are suitable for use as amplifying elements in the main temperature control loops of nuclear power reactors. The control problems encountered are discussed and a basic temperature controller and three practical designs based on this controller are de scribed. An indication of the expected reliability of these systems is given, based on experience with similar amplifiers in aircraft applications. View full abstract»

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  • A High-speed echo-sounder recorder having seabed lock

    Page(s): 441 - 452
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    An electro-mechanical recorder giving an intensity-modulated record on dry paper is described which indicates the presence of fish within 1¿ fathoms of the seabed (i.e. under the headline). Experiments were made with several possible types of triggered recorder to determine the best design, also with various signal delays required for seabed lock. Details are given of the moving-iron recorder, finally adopted, which displays a range of 4 fathoms with high accuracy across paper 6 in. wide. A magnetic drum storage system (described in an associated paper con cerning the complementary c.r.t. display), is employed. These displays form part of a comprehensive fish-detection equipment of improved acoustic performance, for use on distant-water trawlers. View full abstract»

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  • Artificial cardiac pacemakers for the long-term treatment of heart block

    Page(s): 453 - 456
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (431 KB)  

    Electronic cardiac stimulators using blocking oscillators are described. The units operate (1) through wires from an external unit, (2) internally with external power supply and (3) as a completely sell-contained implanted unit which can be controlled from outside the body by inductive pick-up. View full abstract»

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  • The fundamental importance of the Heaviside operational calculus

    Page(s): 461 - 477
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    It is an essential part of Heaviside's operational calculus that the symbol p is an operator equivalent to d/dt and that p and p¿1 the inverse or integrating operator, are commutative. This is ensured if the operation of integration is not confused with the operation of selection, i.e. if the lower limit of integration is taken as minus infinity, and is only raised to a finite value when we are sure that this change has no effect. We have first set forth in as explicit a manner as possible what we believe to be the basis of Heaviside's own work, with particular attention to the properties of the unit function H(t) and the way in which differentiation and integration can be extended to include functions containing H(t) or its derivatives as factors. A continuous function approximating to H(t) is considered in an Appendix. The kinds of function (of time) that can occur in nature are carefully considered; the case of both passive and active networks is discussed. Heaviside's contemporaries were not prepared to accept his premises and methods even if they were forced to accept his results. The relation between Heaviside's calculus and Fourier analysis, symbolic calculus and Laplace transforms is therefore considered; the advocates of symbolic calculus and particularly of Laplace transforms have introduced difficulties and even errors which need not have occurred if they had followed Heaviside more faithfully. The full power and universality of Heaviside's approach (in which the mathematics was always subordinate to the physics) is made clear in Section 4, where the relation between input and output is considered for any system, not necessarily electrical; this relation is expressed by a single operational equation, but there are several possible ways of handling that equation and it is important not to choose too early which of these ways should be used.¿ View full abstract»

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  • Measuring circuits used in an automatic transistor tester

    Page(s): 479 - 488
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    A machine which is capable of testing, sorting and measuring all the significant parameters of germanium r.f. alloy transistors at a rate of 1200 transistors per hour is described. Since the machine uses essentially only one test head, each measuring circuit, which is mounted on a printed circuit card, is connected in turn to this test head by means of dry reed relays. The paper describes how 10 d.c. parameters and 7 a.c. measurements and tests are carried out on each transistor and explains some of the circuits in detail. In addition the relative merits of single test station and multi-test station machines are discussed. View full abstract»

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  • Data collection systems, their application and design

    Page(s): 489 - 496
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    A distinction is drawn between two types of data gathering systems. Possible applications for one of these, namely data collection systems, are discussed. The requirements of such systems are then outlined and two types of data collection system are described to indicate possible solutions to these requirements. The final section deals with the totalsystems approach and the effect it will have on future data collection systems. View full abstract»

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  • Data acquisition systems for control applications

    Page(s): 497 - 506
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    The features of data acquisition systems are discussed. The advantages of modularity are stressed with particular reference to the interface concept. Basic system elements are described. Operations on data which can be carried out within the acquisition system are mentioned briefly. View full abstract»

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Aims & Scope

The Journal of the British Institution of Radio Engineers was published by IET between 1939 and 1962.

Full Aims & Scope