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Electrical Engineers, Proceedings of the Institution of

Issue 8 • Date August 1970

 This issue contains several parts.Go to:  Part R 

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Displaying Results 1 - 24 of 24
  • Spectral transformations for digital filters

    Publication Year: 1970, Page(s):1585 - 1590
    Cited by:  Papers (128)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (677 KB)

    The paper describes certain general transformations for digital filters in the frequency domain. The term digital filter is used to denote a processing unit operating on a sampled waveform, so that the input, output and intermediate signals are only defined at discrete intervals of time; the signals may be either p.a.m. or p.c.m. The transformations discussed operate on a lowpass-digital-filter pr... View full abstract»

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  • Multiterminal gyrator

    Publication Year: 1970, Page(s):1591 - 1598
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (753 KB)

    The multiterminal-gyrator concept is introduced as an extension of the well known 2-port device. In general, it is treated as having n input and m output terminals plus a reference or earthed terminal, common to both input and output. The (n + m + 1)-terminal device is therefore mathematically described using an (n + m)th-order admittance matrix. Both the mathematical characterisation and impedanc... View full abstract»

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  • Proposal for simplified computer derivation of network state-space formulation

    Publication Year: 1970, Page(s):1599 - 1602
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (394 KB)

    A simplified derivation of the state-space equations is presented for linear circuits consisting of capacitors embedded in a conductive (i.e. nonreactive) structure (GC circuits). Inductors which do not form cutsets containing only inductors and/or current sources can be included by gyrator simulation. A compact organisation of the derivation is made possible by this sacrifice in generality. Thus ... View full abstract»

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  • Wideband multiplier correlator

    Publication Year: 1970, Page(s):1603 - 1608
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (890 KB)

    Apparatus to measure the correlation between two wideband (10¿100MHz) noise signals has been developed for the stellar intensity interferometer at the Narrabri observatory. This instrument is used to measure the angular diameters of stars in the range 0.01¿0.0001¿ of arc, with an accuracy within about 5%. To achieve this precision with the low signal/noise ratio of an intensity interferometer, ... View full abstract»

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  • Distortion performance of single-balanced diode modulators

    Publication Year: 1970, Page(s):1609 - 1614
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (634 KB)

    The techniques of switching-function analysis are used to extend previous work on the intermodultion and crossmodulation-distortion properties of the ring modulator to include the single-balanced series and shunt configurations. The influence of the local-oscillator source impedance is considered, and excellent agreement is demonstrated between the predicted 3rd-order intermodulation performance o... View full abstract»

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  • Mode filtering in long multimode transmission lines with random coupling

    Publication Year: 1970, Page(s):1615 - 1619
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (575 KB)

    Effectiveness of mode filtering in multimode waveguides designed for long-distance communication is examined. Based on a general solution to weakly coupled transmission lines having different attenuation coefficients, an expression is derived for the fractional reduction of the average reconverted power by mode filters. It is shown that this improvement depends on the differential attenuation of t... View full abstract»

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  • Radiation patterns of circular apertures with structural shadows

    Publication Year: 1970, Page(s):1620 - 1626
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    The shadows and blockage occurring in large antennas are approximated to by well-defined regions constructed from radii and arcs of circles, which are concentric with the aperture, projected onto the aperture plane. The radiation patterns of the obstructed aperture are obtained for both uniform and tapered illumination from the scalar integral. It is shown that apertures obstructed by four symmetr... View full abstract»

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  • Crossproduct terms in synthetic-aperture receivers

    Publication Year: 1970, Page(s):1627 - 1632
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (772 KB)

    The presence of crossproduct terms in multiplicative receiving systems, in particular 2-aerial synthetic-aperture receivers, is illustrated. Methods for suppression of these terms are discussed, as well as the residual level that may be acceptable. It is shown that crossproduct terms are adequately suppressed if there are many cycles of relative-phase variation between sources during the synthesis... View full abstract»

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  • Aperture-synthesis technique for h.f. ionospheric radar

    Publication Year: 1970, Page(s):1633 - 1638
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1032 KB)

    The application of an aperture-synthesis technique to a particular type of radar, designed to observe ionospherically propagated ground backscatter, is proposed, since the bearing resolution of existing equipment has been limited by practical aerial dimensions. The incoherence of ionospherically propagated signals demands a multiaerial synthetic-aperture technique, and a 2-serial system is suggest... View full abstract»

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  • New rigorous formulation of electromagnetic scattering from perfectly conducting bodies of arbitrary shape

    Publication Year: 1970, Page(s):1639 - 1647
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1088 KB)

    A new exact method is developed for investigating the scattering of plane electromagnetic waves from perfectly conducting bodies. The multipole scattering problem is solved exactly and the method is applicable to more than one body localised in a region. Expansion of Green's dyadic in concentric spherical regions, one of them containing the scatterers, leads to the corresponding multipole expansio... View full abstract»

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  • Effect of electrolyte resistance in porous anodes

    Publication Year: 1970, Page(s):1648 - 1654
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (827 KB)

    A transmission-line treatment has been used to explain the variation of capacitance and dissipation factor of cylindrical porous-anode bodies as a function of frequency due to the distributed resistance of the electrolyte within the pores. A correction has been determined to account for the effect of the ends of the cylindrical body. An effective resistivity is determined from experimental results... View full abstract»

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  • Master circuit matrix

    Publication Year: 1970, Page(s):1655 - 1656
    IEEE is not the copyright holder of this material | PDF file iconPDF (272 KB)
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  • New 3-phase winding of low m.m.f.-harmonic content

    Publication Year: 1970, Page(s):1657 - 1666
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1070 KB)

    A new method of connection for 3-phase windings is described. It is shown that a conventional 60° phase-spread winding can be subdivided into two components, one of which is connected in delta and the other in star, the two winding components being connected in parallel to a 3-phase supply. Theoretically, the new principle is only applicable where the number of slots per phase is infinite, but it... View full abstract»

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  • Field-harmonic theory of slip-ring motor taking multiple armature reaction into account

    Publication Year: 1970, Page(s):1667 - 1674
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (712 KB)

    The voltage equations of the slip-ring motor including the multiple armature reaction, i.e. the primary, secondary and tertiary armature reaction, are derived and presented in matrix notation. The theory put forward is valid for integral-and fractional-slot windings. With integral-slot windings and equal numbers of phases in the stator and the rotor, the current and field harmonics are neither inf... View full abstract»

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  • Influence of synchronous-machine-rotor angular-velocity variations in transient-stability studies

    Publication Year: 1970, Page(s):1675 - 1682
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1064 KB)

    A modified method of power-system transient-stability assessment is presented and shows that, although they were previously considered to be negligible, the inclusion of the effects of variations of rotor angular velocities can have an influence on the stability as great as that of other factors (such as the voltage regulator saturation, flux decay and machine damping) which it is already consider... View full abstract»

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  • Steady-state power/rotor-angle characteristics for synchronous machine including hysteresis

    Publication Year: 1970, Page(s):1683 - 1691
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1112 KB)

    Theoretical steady-state power/rotor-angle expressions are derived for a salient-pole synchronous machine with hysteresis in the field and armature members represented by idealised elliptical flux-density/magnetising-force characteristics. It is shown that the effect of hysteresis may be represented in an equivalent machine simulation by modified unequal values of direct and quadrature axis effect... View full abstract»

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  • Discussion on "Multiconductor transmission lines. Theory of natural modes and Fourier integral applied to transient analysis"

    Publication Year: 1970, Page(s):1691 - 1692
    IEEE is not the copyright holder of this material | PDF file iconPDF (268 KB)
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  • Lightning protection of cable-connected high-voltage distribution substations by surge diverters

    Publication Year: 1970, Page(s):1693 - 1702
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1051 KB)

    For devising a general guidline on lightning protecting of distribution substations connected to overhead lines through cables, the surge voltages at both ends of the cable are derived for various types of incident lightning surges. The substation is represented by an open-circuited cable, which would result in surge voltages at the cable terminations equal to, or more severe than, the surge volta... View full abstract»

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  • Versatile phase comparator based on detection of phase sequence for protective relays

    Publication Year: 1970, Page(s):1703 - 1704
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | PDF file iconPDF (180 KB)
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  • Optimal control of linear multivariable systems with quadratic performance criteria

    Publication Year: 1970, Page(s):1705 - 1713
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1087 KB)

    The optimal control of continuous-time linear multivariable systems with finite- and infinite-time quadratic performance is investigated using the maximum principle. The time-varying optimal-control law is shown to be related to the matrix Riccati differential equation, and a solution is obtained in terms of the components of the transition matrix associated with the linear system of 2n differenti... View full abstract»

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  • Sufficient condition for asymptotic stability of nonautonomous nonlinear-feedback systems by application of the modifed nonlinearity concept

    Publication Year: 1970, Page(s):1714 - 1716
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (410 KB)

    The problem of deriving a sufficient condition for a given nonlinear system with a high-frequency input to be asymptotically stable is considered. It is suggested that the dynamics of the disturbed motion of the nonautonomous system can be approximated to sufficiently well by applying the concept of the so-called `modified nonlinearity¿. The system so obtained is in a form to which the theorem of... View full abstract»

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  • Properties of linear constant systems

    Publication Year: 1970, Page(s):1717 - 1720
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (550 KB)

    The properties of (pointwise-state) controllability and observability are generalised to apply to systems not in state-space form. A standard form is given for system matrices in second form, and for transfer-function matrices, and is shown to be unique. The standard form is used to analyse the controllability and observability (as generalised) of cascaded systems. View full abstract»

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  • Ion current to a spherical probe in a flowing high-pressure plasma under thin-sheath conditions

    Publication Year: 1970, Page(s):1721 - 1724
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (453 KB)

    The current to a large (radius = 2.4 mm) negatively biased spherical probe in a flowing plasma (a propane/air flame) has been measured over wide ranges of plasma-ionisation density (3 × 1015 to 1018 m¿3), probe bias (10¿400V) and probe/plasma relative velocity (3¿40m/s). Under these conditions, the sheath surrounding the probe is thin and the probe current is a function of the probe/plasma vel... View full abstract»

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  • Use of uniform-field values of Townsend's - to predict current multiplication in nonuniform fields

    Publication Year: 1970, Page(s):1725 - 1728
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (572 KB)

    Some earlier investigations had indicated that the amount of ionisation observed in nonuniform fields was more than that predicted by the use of uniform-field values of ¿¿/p to evaluate current multiplication. The reasons for this discrepancy between theory and experiment were attributed to the variation (> 2%) of electric-field intensity over an electron mean free path or to the nonequilibrium... 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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