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Electrical Engineers, Proceedings of the Institution of

Issue 10 • Date October 1968

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Displaying Results 1 - 25 of 33
  • Multiconsole-computer display system utilising television techniques

    Publication Year: 1968, Page(s):1375 - 1379
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    Standard television-raster techniques can provide good-quality digitally generated alpha-numeric and graphical displays at low cost. The regeneration of displayed information for a multiconsole system can be conveniently and economically achieved using a magnetic-drum buffer store whose parallel-access ability and synchronous nature are particularly attractive features. A system for 30 or more ind... View full abstract»

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  • Crystal filters with extended bandwidths

    Publication Year: 1968, Page(s):1380 - 1384
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (490 KB)

    The properties of a lowpass prototype filter of degree 4, exhibiting equal-ripple behaviour in the passband, are discussed. Explicit solutions are given for the element values of the corresponding crystal bandpass filter, and, from these, it is seen that the attainable bandwidth depends on one parameter only of the lowpass prototype. For the case where a deliberate mismatch is introduced into the ... View full abstract»

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  • Ternary arithmetic unit

    Publication Year: 1968, Page(s):1385 - 1388
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (459 KB)

    A ternary arithmetic unit is proposed which is based on the ternary symmetric number representation using digit +1, 0, ¿1. The advantages of this number representation are given in detail. Present-day familiar diode-transistor circuitry is applied. Detailed circuit realisations and logic diagrams of ternary gates, a 3-stable element, and a ternary full adder are developed. View full abstract»

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  • Analysis of the accuracy of p.c.m. cascade coders

    Publication Year: 1968, Page(s):1389 - 1394
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (607 KB)

    The cascade type of p.c.m. coder appears at the present time to provide the most suitable means of high-speed p.c.m. encoding. The paper describes the sources of inaccuracy in such a coder and the nature and relative gravity of the resulting errors. Criteria for error-free operation are developed in the course of an analysis based on both worst-case and statistical approaches. It emerges that the ... View full abstract»

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  • Synthesis of multimode waveguide transition sections

    Publication Year: 1968, Page(s):1395 - 1397
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    Two different analytical solutions are employed to synthetise waveguide transition sections. The first is derived from the generalised telegraphist's equations attributed to Schelkunoff, and the second is based on a generalised quasioptical approach. Both solutions are expressed in terms of an infinite set of simultaneous differential equations which are solved numerically through an iterative pro... View full abstract»

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  • Determination of the aperture field of an antenna by a beam-displacement measurement

    Publication Year: 1968, Page(s):1398 - 1402
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (495 KB)

    A method is given for obtaining the scalar amplitude distribution in the aperture of an antenna through the single precise measurement of the aberration of the direction of the peak of the radiated beam caused by partially obscuring the aperture by a refiectionless dielectric sheet of known small phase-insertion delay. Analysis is presented whereby the distribution obtained can be presented as the... View full abstract»

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  • Antenna noise temperature

    Publication Year: 1968, Page(s):1403 - 1410
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (906 KB)

    Expressions for calculating the noise temperature of an antenna are deduced. The influence of the atmosphere and the environment of the antenna are discussed. It appears that analytical expressions for the sky temperature T(¿, ¿) are available. So, if the antenna gain function G(¿, ¿) is also known analytically, it is possible to calculate the noise temperature of the antenna. If G(¿, ¿) is ... View full abstract»

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  • Impedance properties of capacitively loaded dipoles

    Publication Year: 1968, Page(s):1411 - 1418
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    The input-impedance variation of a centre-fed dipole with frequency can be much reduced by incorporating capacitances in the dipole arms. For a single capacitance a comparison is made between the results of sinusoidal theory and experimental measurements on a monopole. Satisfactory agreement is obtained. For a triply loaded monopole a v.s.w.r. of better than 2.5 is effectively obtained on a 75¿ c... View full abstract»

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  • Fields in the image space of symmetrical focusing reflectors

    Publication Year: 1968, Page(s):1419 - 1430
    Cited by:  Papers (39)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1449 KB)

    The fields scattered by circular symmetric reflector illuminated by a linearly polarised wave incident normally on the aperture are calculated from the induced surface currents. It is shown that the fields in the axial region can be represented by a spectrum of near-spherical hybrid waves propagating along the axis. For large microwave focusing reflectors, the wavefronts are effectively plane in t... View full abstract»

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  • Measurements of the propagation component of radar tracking noise at a wavelength of 3cm

    Publication Year: 1968, Page(s):1431 - 1438
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (890 KB)

    Measurements have been made of the angular propagation noise and amplitude scintillations on a 15km overland path at 1° elevation in northern England. They indicate r.m.s. deviations in angle of arrival ranging between 1" and 10" (4.8¿48¿rad) for aerials of 2m aperture during one year's observations. The propagation noise (short-term angle-of-arrival fluctuation) spectrum falls rapidly with inc... View full abstract»

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  • Correlation of signal fluctuations at two frequencies in propagation through an irregular medium

    Publication Year: 1968, Page(s):1439 - 1442
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (463 KB)

    The Rytov method of calculating the signal fluctuations produced in wave propagation through a medium containing weak random irregularities in refractive index is used to study the correlation between the fluctuations occurring at different frequencies over the same line-of-sight transmission path. Amplitude and phase fluctuations are treated separately, and explicit results are given for three di... View full abstract»

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  • Modal expansions for electromagnetic scattering from perfectly conducting cylinders of arbitrary cross-section

    Publication Year: 1968, Page(s):1443 - 1445
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (357 KB)

    The scattering of plane waves from perfectly conducting cylinders is studied, using the condition that the total field inside the cylinders must be zero. It is shown that the surface current density can always be expressed as a sum of proper modes. In general, fewer modes are required for calculating the scattered far field than are required for calculating the surface current density to the same ... View full abstract»

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  • Wave scattering from a circular cylinder coated with an inhomogeneous plasma at oblique incidence

    Publication Year: 1968, Page(s):1446 - 1450
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    The scattered fields of a plane wave incident obliquely upon an infinite conducting cylinder enveloped in a radially inhomogeneous plasma sheath are determined by the stratification technique. A transmission-coefficient matrix is introduced for each layer, so that the tangential field components at any interface can be related to those at any other interface by a composite matrix through chain mul... View full abstract»

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  • Corrigendum: Threshold extension of an f.m. demodulator using a dynamic tracking filter

    Publication Year: 1968
    IEEE is not the copyright holder of this material | PDF file iconPDF (88 KB)
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  • Techniques for load prediction in the electricity-supply industry

    Publication Year: 1968, Page(s):1451 - 1457
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (951 KB)

    Considerable work has been carried out in recent years on problems concerned with load-flow analysis, economic generation scheduling and system-security checking in electrical power systems. An aspect of the overall problem which has not received much attention is that of forecasting electrical load demand. It is, however, important from the practical point of view of economic generation schedulin... View full abstract»

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  • Discussion on "Loading of power transformers"

    Publication Year: 1968, Page(s):1457 - 1458
    IEEE is not the copyright holder of this material | PDF file iconPDF (276 KB)
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  • Investigation of the load-flow problem

    Publication Year: 1968, Page(s):1459 - 1470
    Cited by:  Papers (103)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1284 KB)

    A mesh approach is developed for the formulation of the network equations in load-flow analysis. It is shown to converge at least as fast as the usual methods using the nodal-impedance matrix. A hybrid approach is then developed, using a combination of an impedance-matrix method and a nodal-admittance-matrix method. The hybrid exhibits very fast convergence, and is the most powerful method encount... View full abstract»

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  • Starting performance of synchronous motors with solid salient poles

    Publication Year: 1968, Page(s):1471 - 1484
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1633 KB)

    The asynchronous performance of a synchronous motor, at a given slip, may be estimated from the 2-axis operational-admittance frequency functions Yd(js?0), Yq(js?0). The functions are commonly depicted as frequency-response loci. The frequency-response loci of a laminated-pole motor are shown to be analogous to the traditional induction-motor circle diagram. An accurate theoretical method is given... View full abstract»

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  • Copper drag on commutators

    Publication Year: 1968, Page(s):1485 - 1492
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1376 KB)

    The paper includes a survey of the very sparse literature on copper drag and gives a general outline of the metallurgy of commutator bars and copper drag from various sources. Laboratory experiments are described which simulate the production of copper drag, and typical specimens obtained are shown to be very similar to practical examples. The basic cause of copper drag appears to be a vibration a... View full abstract»

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  • New method of measuring 2-axis quantities

    Publication Year: 1968, Page(s):1493 - 1498
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (896 KB)

    The paper describes a new measuring technique in which synchro resolvers are used to generate the transformed 2-axis variables from the armature phase quantities. It is applicable to any a.c. machine under dynamic conditions, and the technique has particular significance in the analysis of synchronous machines, enabling much information to be obtained from a single starting test. Frequency-respons... View full abstract»

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  • Discussion on 'Digital-computer methods in dynamic-response analyses of turbogenerator units'

    Publication Year: 1968, Page(s):1498 - 1502
    IEEE is not the copyright holder of this material | PDF file iconPDF (925 KB)
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  • Magnetic equivalent circuits

    Publication Year: 1968, Page(s):1503 - 1511
    Cited by:  Papers (37)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1206 KB)

    The possibilities of using magnetic, instead of electric, equivalent circuits for eddy-current devices, which have recently been pointed out by Laithwaite, are here explored further. Couplings between distributed flux paths and windings can be expressed in terms of a generalised linkage parameter N, which is associated with flux linkage in electric circuits, and with an analogous current linkage i... View full abstract»

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  • Discussion on "New developments in high-pressure discharge lamps"

    Publication Year: 1968
    IEEE is not the copyright holder of this material | PDF file iconPDF (107 KB)
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  • Thyristor-supplied tandem cold mill

    Publication Year: 1968, Page(s):1513 - 1521
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1754 KB)

    A modern tandem mill has a high performance, which requires a complex, sophisticated control system. Antiparallel-connected thyristor convertors combine fast response with high efficiency for supplying the continuously controllable power to vary the speed of the d.c. motors. The changeover time from one antiparallel convertor to the other when a reversal in power is required (e.g. at the commencem... View full abstract»

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  • Unbalanced magnetic push

    Publication Year: 1968
    IEEE is not the copyright holder of this material | PDF file iconPDF (115 KB)
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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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