Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Electrical Engineers, Proceedings of the Institution of

Issue 11 • Date November 1967

Filter Results

Displaying Results 1 - 25 of 44
  • Simplified theory of nonlinear phenomena in ferrimagnetic materials

    Publication Year: 1967 , Page(s): 1585 - 1591
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (785 KB)  

    The onset of nonlinear phenomena in ferrites is due to the exponential growth of spin waves from their thermal excitation by the coupling of the spin waves to the uniform mode through exchange and demagnetising fields. The purpose of the paper is to present a unified development of nonlinear theory under perpendicular and parallel microwave pumping in terms of the components of magnetisation along the axes of the spin-wave ellipse. The eccentricity of the spin precession appears explicitly, and the final transformation to circular variables, the equivalent of the more usual Hollstein-Primak off transformation, is considerably simplified. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on "U.H.F. tunnel-diode amplifier" and "Short-hop radio-relay systems using tunnel-diode repeaters"

    Publication Year: 1967 , Page(s): 1591 - 1592
    Save to Project icon | PDF file iconPDF (259 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • D region electron-density distributions from propagation data

    Publication Year: 1967 , Page(s): 1593 - 1597
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (623 KB)  

    By using a fullwave computer program, Deeks was able to find an electron-density distribution in the D region which would account for certain v.l.f. and l.f. propagation results. Here, more extensive experimental results are employed for this purpose; in particular, ground-interference patterns on 16 and 21 kHz. Stationary-phase techniques are developed to enable such patterns to be calculated from an assumed distribution. It is found that, to get the best fit, Deeks's distribution has to be modified appreciably; the required change can be described roughly as reducing its height by about 6 km. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of varactor harmonic generators with arbitrary drive levels

    Publication Year: 1967 , Page(s): 1598 - 1604
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    An analysis for varactor harmonic generators with arbitrary drive level is presented. The analysis is applicable to arbitrary CV laws for the varactor including the idealised charge-storage diode and to cases with or without idlers. Graphical results are presented for a variety of useful cases, and comparisons between multipliers using charge-storage and other types of diode are made. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Signal processes in transistor mixer circuits at high frequencies

    Publication Year: 1967 , Page(s): 1605 - 1612
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (877 KB)  

    The signal performance of transistor mixers at high frequencies is investigated by treating the basic nonlinear differential equations of the transistor. These equations have been solved in normalised form on a digital computer, and the results have been obtained as normalised graphs, which allow rapid prediction of the conversion transconductance at higher frequencies. Transistor parameters and operating conditions for maximum conversion gain at high frequencies are readily determined from these results. The transistor-mixer input impedance is also investigated in detail, and it is shown, in general, to be higher than the corresponding amplifier input impedance. Although calculable, the precise input impedance cannot be predicted as simply as the conversion transconductance. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-speed spectrum analyser using a pulse-compression technique

    Publication Year: 1967 , Page(s): 1613 - 1616
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (519 KB)  

    The paper describes a spectrum analyser intended for use with a mobile short-range frequency-modulated continuous-wave radar. The device employs a pulse-compression technique to perform a fast spectrum analysis giving a serial time output. The bandwidth and duration of the output signal are such as to permit direct modulation of an ordinary radar display. The speed of the analyser is approximately equal to that of an equivalent multiple-filter device incorporating a serial-readout sampling switch. The particular device described analyses a spectrum of width 3Mc/s in 80¿s. The analyser gives a serial output over 40¿s, the bandwidth of the output being about 2Mc/s. The fractional frequency resolution of the device is approximately 1/60. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contact bounce in dry reed relays

    Publication Year: 1967 , Page(s): 1617 - 1622
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    A simple theory is developed to account for contact bounce observed after closure of dry reed relays. The basic pattern of the bounce oscillograms is explained, and the theory also establishes the conditions under which bounce can occur. The effect of altering various operating parameters is discussed, and it is shown that in practice it is often difficult to reduce the bounce appreciably while maintaining other desirable operating characteristics. Some design modifications can, however, lead to a significant reduction of bounce. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Trunking systems for p.c.m. exchanges

    Publication Year: 1967 , Page(s): 1623 - 1629
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (787 KB)  

    The introduction of p.c.m. transmission systems is making possible the use of t.d.m. exchanges which switch channels in the digital form. These exchanges need both to switch and to introduce delay in order to give access to all outgoing channels. Space equivalents of the t.d.m. exchanges are developed, and formulas for congestion for the channel-changing units within the exchange are derived. Further work is required before a complete exchange can be analysed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Unified theory on topological analysis of linear systems

    Publication Year: 1967 , Page(s): 1630 - 1636
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1090 KB)  

    Topological formulas were stated by Kirchhoff for mesh equations, by Maxwell for nodal equations, by Mason for signal-flow graphs and by Coates for flow graphs. In the paper, it is shown that all these formulas can be obtained from one another. Using these relationships, a generalised star-mesh transformation in network theory is obtained. Simple ways of drawing these associated directed graphs from a given network and illustrative examples are also given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synthesis of RC equaliser networks for general loads

    Publication Year: 1967 , Page(s): 1637 - 1640
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (342 KB)  

    A method of synthetising RC equaliser networks for general loads is given. The configuration specially considered is that of a low-pass RC ladder. The necessary and sufficient conditions for realisability are derived, taking the source resistance into consideration. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Efficient generation of tree-admittance products in a cascade of 2 port networks

    Publication Year: 1967 , Page(s): 1641 - 1646
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (674 KB)  

    Generation formulas from which the tree, port terminal-pair 2 tree, and terminal 3 tree admittance products in a cascade of arbitrary 2port networks are computed in a routine manner, without any duplications, redundancies, or cancellations of terms, are presented in the paper. The signs of the 2tree products are readily determined by a simple manoeuvre in the application of the generation technique; so the overall 2port network open-circuit impedance and short-circuit admittance matrices can be written down immediately. Algebraic complexity of the computations involved is inherently minimal. Consequently, compared with existing techniques of analysis, the method requires less time and effort, is less subject to error and is therefore more practicable. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Formulation of state equations ot general nonlinear systems of multiterminal components

    Publication Year: 1967 , Page(s): 1647 - 1651
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (574 KB)  

    A topological approach to the formulation of state equations for quite general classes of nonlinear dynamical systems of lumped multiterminal components is developed. Three examples, drawn from diverse fields, demonstrate that the state equations form a 'natural' mathematical model for dynamical analysis. The general theory developed is applicable to a great many physical systems, including the special case of networks comprising linear or nonlinear, passive or active components. The formulation technique is also extended to the systems in which some or all of the components are described by parametric equations. Certain sufficiency conditions are stated in the form of three assertions; one of these could be applied to ensure the existence of the state model in a specific case study. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theoretical investigation of cylindrical dielectric-rod antennas

    Publication Year: 1967 , Page(s): 1651 - 1652
    Save to Project icon | PDF file iconPDF (307 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theoretical investigation of cylindrical dielectric-rod antennas

    Publication Year: 1967 , Page(s): 1652 - 1653
    Save to Project icon | PDF file iconPDF (356 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Measurement of impedance at microwave frequencies using directional coupler and adjustable short circuit

    Publication Year: 1967 , Page(s): 1653 - 1655
    Cited by:  Papers (3)
    Save to Project icon | PDF file iconPDF (453 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Quick computation of stability factor, optimum terminations and maximum power gain of active 2-ports

    Publication Year: 1967 , Page(s): 1655 - 1656
    Save to Project icon | PDF file iconPDF (244 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Doubly fed operation of cascade-connected machines

    Publication Year: 1967 , Page(s): 1657 - 1664
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (796 KB)  

    A doubly fed cascade-connected machine system may operate either synchronously or asynchronously. The analysis of both modes of operation is considered, and the corresponding equivalent circuits are shown. Use is made of the basic underlying principles of this type of system to develop a practicable stator-fed synchronous machine. The problem of the steady-state stability of this machine is discussed, and simple methods of achieving stable operation are described. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synchronous and asynchronous torques in squirrel-cage induction motors

    Publication Year: 1967 , Page(s): 1665 - 1673
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1039 KB)  

    Synchronous torques occurring in squirrel-cage induction motors may be due to a variety of causes, one of which is the interaction between pairs of stator and rotor harmonics. The paper includes an analytical treatment of the squirrel-cage rotor and applies this and the analysis of the doubly-fed cascade machine to the calculation of synchronous torques of this particular character. The concepts are extended to take account of the way in which a squirrel-cage rotor may provide coupling between stator harmonics of different orders during normal asynchronous operation of the machine, and an equivalent circuit for this is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on ¿Automatic resynchronisation of synchronous machines¿ and ¿Study of asynchronous operation and resynchronisation of synchronous machines by mathematical models¿

    Publication Year: 1967 , Page(s): 1674 - 1678
    Save to Project icon | PDF file iconPDF (852 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on ¿Digital-computer program for design synthesis of large squirrel-cage induction motors¿

    Publication Year: 1967 , Page(s): 1679 - 1680
    Save to Project icon | PDF file iconPDF (234 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Travelling-wave problem in electrical machines

    Publication Year: 1967 , Page(s): 1681 - 1683
    Cited by:  Papers (19)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (355 KB)  

    The problem discussed relates to the calculation of electromagnetic travelling fields in electrical machines. The idealised structure considered comprises a number of laminar regions of infinite extent in the plane of lamination and of arbitrary thickness. Some or all of these regions may be conducting and/or ferromagnetic with constant permeability. The travelling field is produced by an applied current sheet at the interface between two layers, distributed sinusoidally along the plane of lamination and flowing normally to the direction of motion. A convenient reformulation of existing theory is suggested which simplifies calculation. The normal limitations imposed by the amount of algebraic manipulation involved are removed by the use of a transfer matrix. This provides the facility to introduce numerical values directly into the matrix formulation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on ¿Application of transistor techniques to relays and protection for power systems¿

    Publication Year: 1967 , Page(s): 1684 - 1691
    Save to Project icon | PDF file iconPDF (1367 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The moving-secondary voltage regulator: some aspects of a generalised transformer

    Publication Year: 1967 , Page(s): 1692 - 1699
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1169 KB)  

    An alternative method of operation for the well known moving-coil voltage regulator is discussed, and its theory is treated on classical lines. In the new régime, the short-circuited coil is fixed, and the output is drawn from the moving coil, instead of vice versa. A comparison is drawn between this moving-secondary regulator, the moving-coil regulator and the induction-type voltage regulator, which serves to clarify certain basic points in transformer theory. Tests were made on a small laboratory regulator, specially devised for experimental purposes, and some discussion of these tests is included. The same regulator also enables a variety of other educational tests to be performed, the regulator being, in effect, a generalised transformer. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on "Lightning performance of British high-voltage distribution systems"

    Publication Year: 1967 , Page(s): 1699 - 1703
    Save to Project icon | PDF file iconPDF (899 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion on ¿Electric water-heating development with particular reference to domestic use¿

    Publication Year: 1967 , Page(s): 1703 - 1704
    Save to Project icon | PDF file iconPDF (306 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

Full Aims & Scope