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Electrical Engineers, Proceedings of the Institution of

Issue 4 • Date April 1968

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Displaying Results 1 - 25 of 26
  • A fully electrostatic, flat, thin television tube

    Publication Year: 1968 , Page(s): 467 - 478
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (1482 KB)  

    A description is given of important improvements and modifications which have been made in the design of a flat television tube. In the new form, magnetic components have been eliminated and considerable structural simplifications have been made. An electrostatic deflection system is described which is capable of giving deflection angles of ±60°, and a mathematical model of such a system is deve... View full abstract»

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  • Narrowband microwave suppression filters

    Publication Year: 1968 , Page(s): 479 - 486
    Click to expandAbstract | PDF file iconPDF (1021 KB)  

    A theoretical and experimental investigation into narrow-bandwidth microwave rejection filters, which can be constructed from simple, standard microwave components, is described. Suppression factors of at least 50dB at resonance are possible, and the bandwidth can be easily controlled. A simple form of analysis, which indicates clearly the effects of variation in the parameters, gives good agreeme... View full abstract»

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  • Saturation characteristics of tunnel-diode amplifiers

    Publication Year: 1968
    PDF file iconPDF (125 KB)  
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  • Noise in transistor mixers at high frequencies

    Publication Year: 1968 , Page(s): 487 - 495
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (1109 KB)  

    The noise performance of transistor mixers at high frequencies is investigated by first considering the signal processes in the mixer. A knowledge of the mixer signal performance, and consideration of the various noise sources in the transistor, allows calculation of expressions for the mixer noise figure and optimum source resistance. The effects of variation in operating conditions are discussed... View full abstract»

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  • F.E.T. operation in the pinchoff mode

    Publication Year: 1968 , Page(s): 496 - 502
    Cited by:  Papers (3)
    Click to expandAbstract | PDF file iconPDF (650 KB)  

    Shockleys's theory of the junction field-effect transistor with step-junction transitions is reviewed and improved. Estimates of the effect of channel-length modulation on the output conductance and drain-to-gate capacitance are obtained. Theoretical results for both the constant mobility and field-dependent mobility cases are presented and are compared with experimental measurements made on a com... View full abstract»

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  • V.H.F. radio propagation by double-hop reflection from a tropospheric layer

    Publication Year: 1968 , Page(s): 503 - 506
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (468 KB)  

    A propagation mechanism is discussed which comprises two reflections from a horizontally-stratified, partially-reflecting layer. Such a layer located appreciably below the `crossover height¿ (i.e. the height of intersection of the horizon rays from the terminals) may cause an enhancement of signal strength which exceeds that obtained with a single reflection from a similar layer at the crossover ... View full abstract»

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  • Power-control characteristics of an asynchronised synchronous machine: a computer study

    Publication Year: 1968 , Page(s): 507 - 510
    Click to expandAbstract | PDF file iconPDF (504 KB)  

    An asynchronised synchronous machine is a combination of a doubly excited synchronous machine and an automatic control system, and it overcomes some of the basic disadvantages inherent in a synchronous machine. The paper describes some analogue-computer studies in which the steady-state and transient characteristics of an asynchronised synchronous machine are examined from the point of view of pow... View full abstract»

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  • Prediction of induction-motor dynamic performance in power systems

    Publication Year: 1968 , Page(s): 511 - 518
    Cited by:  Papers (3)
    Click to expandAbstract | PDF file iconPDF (913 KB)  

    The application of the o-d-q transformation (due to Park) to the induction-machine equations is used to develop a set of equations suitable for use with a digital computer in the analysis of dynamic performance. The method of calculation is designed to be compatible with those already in use for the analysis of synchronous-machine behaviour and makes use of a novel equivalent circuit. An account i... View full abstract»

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  • Transients in induction machines with terminal capacitors

    Publication Year: 1968 , Page(s): 519 - 527
    Cited by:  Papers (11)
    Click to expandAbstract | PDF file iconPDF (1072 KB)  

    In order to study the influence of terminal capacitors on the transient behaviour of an induction machine, differential equations are developed in which the nonlinear effect of magnetic saturation is taken into account. Theoretical results obtained from a digital-computer solution of these equations are compared with experimental measurements on a 7.5hp motor. The transients investigated are those... View full abstract»

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  • Voltage stability of radial power links

    Publication Year: 1968 , Page(s): 528 - 536
    Cited by:  Papers (28)
    Click to expandAbstract | PDF file iconPDF (1014 KB)  

    The general phenomenon of voltage collapse or instability at the load end of transmission links is introduced with reference to previous work, and the induction motor is seen to be the critical constituent of system loads. The power/voltage and reactive-power/voltage characteristics of power-system loads are predicted and accurately represented by polynomial expressions which are used in the analy... View full abstract»

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  • Back-to-back test for induction machines: floating gearbox

    Publication Year: 1968 , Page(s): 536 - 537
    PDF file iconPDF (314 KB)  
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  • Universal winding for electrical-machine research

    Publication Year: 1968 , Page(s): 537 - 538
    Cited by:  Papers (3)
    PDF file iconPDF (385 KB)  
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  • Unbalanced magnetic push

    Publication Year: 1968
    Cited by:  Papers (1)
    PDF file iconPDF (178 KB)  
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  • Decomposition techniques in power-system network load-flow analysis using the nodal-impedance matrix

    Publication Year: 1968 , Page(s): 539 - 542
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (518 KB)  

    Partitioning techniques for the nodal-impedance methods of the power-system network load-flow solution are derived and classified. The techniques include normal matrix inversion using partitioning and successive inverse modification, the topological or diakoptic and the algebraic partitioning principles. The paper shows how, without reference to network graph theory, these principles follow from s... View full abstract»

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  • Protection and stabilisation of large superconducting coils

    Publication Year: 1968 , Page(s): 543 - 547
    Cited by:  Papers (11)
    Click to expandAbstract | PDF file iconPDF (702 KB)  

    Large superconducting coils, with stored energies from 108J upwards, must be stable and have a predictable performance. This is achieved by combining the superconductor with a good ordinary conductor (substrate) to form a composite and by providing cooling throughout the winding. In addition, large superconducting coils must be protected against overheating and voltage breakdown which might be cau... View full abstract»

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  • Rational-fraction approximations and asymptotic series

    Publication Year: 1968
    PDF file iconPDF (131 KB)  
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  • New electromagnetic suspension and its stabilisation

    Publication Year: 1968 , Page(s): 549 - 554
    Cited by:  Papers (7)
    Click to expandAbstract | PDF file iconPDF (583 KB)  

    The paper describes an electromagnetic suspension in which use is made of LCRcircuits to modify the force/distance characteristics between magnetised bodies. The modified characteristic is statically stable, and, although the use of series capacitance introduces Qfactor lag and oscillations, it is found by experiment that these can be damped out, giving a considerable advantage in power/weight rat... View full abstract»

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  • End region of a single-load crossconnected m.h.d generator

    Publication Year: 1968 , Page(s): 555 - 561
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (795 KB)  

    A theoretical 2-dimensional analysis is made of the end region of a single-load crossconnected m.h.d. generator in which the duct cross-section, fluid properties and magnetic field are uniform, infinitely fine segmentation of the crossconnected electrode system is assumed. With a single load connected between solid electrodes at each end of the generator, the analysis predicts infinitely high curr... View full abstract»

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  • Method of conjugate gradients applied to self-adaptive digital control systems

    Publication Year: 1968 , Page(s): 562 - 571
    Click to expandAbstract | PDF file iconPDF (1228 KB)  

    A simple continuous process is controlled by a digital computer. The process is initially identified and thereafter represented on a digital computer by means of a dynamic model. The optimum response of the model is obtained by adjusting the parameters of the digital controller to minimise a chosen cost function. Once the optimum controller has been determined by methods involving conjugate gradie... View full abstract»

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  • Optimal control of distributed-parameter systems

    Publication Year: 1968 , Page(s): 572 - 576
    Click to expandAbstract | PDF file iconPDF (664 KB)  

    The paper considers linear distributed-parameter systems described by the diffusion equation. A functional-analysis approach is used to develop a technique for obtaining explicit solutions to the class of optimum-control problems that are reducible to the abstract minimum-norm problem. To illustrate the technique, two specific problems are solved. In both cases, the initial state of the system is ... View full abstract»

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  • `Circle criteria¿ in the parameter plane

    Publication Year: 1968 , Page(s): 577 - 580
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (445 KB)  

    The `circle criteria¿ for giving stability information of linear systems containing one time-varying element are shown to have useful graphical interpretations for design purposes on a parameter-plane diagram. The significance of the parameter-plane approach is that, in a system design, the adjustable parameters of either the time-varying element or the time-invariant subsystem may be selected to... View full abstract»

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  • Response of multidimensional nonlinearities to inputs which are separable processes

    Publication Year: 1968 , Page(s): 581 - 590
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (1024 KB)  

    The property of separability of a process with respect to n random processes is defined and examples of such a process are given. The equivalent gains of a multidimensional nonlinearity (m.d.n.l.), obtained by Kazakov, are shown to constitute the best linear model of the m.d.n.l. in the Wiener sense if, and only if, each of the inputs is separable with respect to all the inputs. An extended versio... View full abstract»

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  • Stability of nonlinear multivariable control systems

    Publication Year: 1968 , Page(s): 590 - 591
    Cited by:  Papers (1)
    PDF file iconPDF (196 KB)  
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  • Automatic load scheduling in a multiarea power system

    Publication Year: 1968 , Page(s): 592 - 596
    Cited by:  Papers (9)
    Click to expandAbstract | PDF file iconPDF (659 KB)  

    In the paper an algorithm is described for solving the problem of secure economic load scheduling on a large power system. The method is an extension of that of Wells, which solves the problem as a linear program by means of the dual simplex algorithm. A dual form of the decomposition principle of Dantzig and Wolfe is used in order to reduce the size of the problem, so that it can be solved effici... View full abstract»

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  • Digital-computer programs for an experimental automatic load-dispatching system

    Publication Year: 1968 , Page(s): 597 - 605
    Cited by:  Papers (4)
    Click to expandAbstract | PDF file iconPDF (1176 KB)  

    The paper is concerned with some digital-computer programs that were used in an experiment in automatic load dispatching. The problems of economic scheduling of generator outputs and assessment of the security of the supply network are discussed, and the programs used to solve them are described. The programs were adequate for experiments on automatic load dispatching, but experience has shown tha... 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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