Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 18, 6 September 1968
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Volume 4, Issue 18
6 September 1968
Simulation of dynamic physical systems using a digital process-control computer
- Author(s): J.G. Sellers and A. Thompson
- Source: Electronics Letters, Volume 4, Issue 18, p. 371 –372
- DOI: 10.1049/el:19680291
- Type: Article
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p.
371
–372
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A digital computer designed for process control can be used for the simulation of complex continuous systems. The program is to contain facilities for the inclusion of items of operating equipment within the simulation study.
Optimising the blocking efficiency in shaped Cassegrain systems
- Author(s): J. Dijk and E.J. Maanders
- Source: Electronics Letters, Volume 4, Issue 18, p. 372 –373
- DOI: 10.1049/el:19680292
- Type: Article
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p.
372
–373
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The blocking efficiency of a Cassegrain antenna system can be improved considerably by shaping the main and the subreflector in such a way that the power, which is normally lost by scattering against the blocking obstacles, arrives at the aperture in the correct phase and direction and with the correct amplitude. It is explained that shadows of (nearly) spherical waves on the aperture can be made to disappear entirely. A practical example is described.
McMillan forms from system matrices
- Author(s): H.H. Rosenbrock
- Source: Electronics Letters, Volume 4, Issue 18, page: 374 –374
- DOI: 10.1049/el:19680293
- Type: Article
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p.
374
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It is shown that the McMillan form of a proper transfer-function matrix G can be obtained directly from any system matrix of least order giving rise to G.
Some properties of relatively prime polynomial matrices
- Author(s): H.H. Rosenbrock
- Source: Electronics Letters, Volume 4, Issue 18, p. 374 –375
- DOI: 10.1049/el:19680294
- Type: Article
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p.
374
–375
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Some necessary and sufficient conditions are given for the polynomial matrices sIn, — A and B to be relatively prime.
Uniqueness of the impulse function of a discrete-time Markov process
- Author(s): G.J. Maruschock and M.H. Mickle
- Source: Electronics Letters, Volume 4, Issue 18, p. 375 –376
- DOI: 10.1049/el:19680295
- Type: Article
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p.
375
–376
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The object of the letter is to find a unique function of n which represents the inverse z transform of unity (1) in the analysis of a finite-state Markov process. The function of n is found to be the sum of two ordinary step functions. The necessary and sufficient conditions for the existence of a one in the z domain in the analysis of a Markov process are determined. Using the necessary and sufficient conditions, the various configurations of the Markov process in which this situation exists are investigated.
‘Semipole’ reluctance motors
- Author(s): P.J. Lawrenson
- Source: Electronics Letters, Volume 4, Issue 18, p. 376 –377
- DOI: 10.1049/el:19680296
- Type: Article
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p.
376
–377
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A novel mode of operation of a reluctance motor is described. The motor combines the advantageous feature of a one-piece lamination, usual with conventional salient-pole designs, and an improved synchronous performance approaching that of the newer segmented-rotor designs. Pull-in performance is good, particularly with high inertias.
Whispering-gallery modes in a tropospheric layer
- Author(s): J.R. Wait
- Source: Electronics Letters, Volume 4, Issue 18, p. 377 –378
- DOI: 10.1049/el:19680297
- Type: Article
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p.
377
–378
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Critical reflection from an elevated tropospheric layer is considered from the standpoint of mode theory. It is suggested that the usually neglected whispering-gallery modes could contribute to the total field in transhorizon tropospheric propagation of microwaves.
Field distribution of the forward-wave plasma-guide mode on a magnetised plasma column
- Author(s): K.C. Gupta and A. Singh
- Source: Electronics Letters, Volume 4, Issue 18, p. 378 –379
- DOI: 10.1049/el:19680298
- Type: Article
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p.
378
–379
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It is shown that, for delay ratios less than √ε1 (where ε1 is the transverse component of the equivalent permittivity tensor), the forward-wave plasma-guide mode on a longitudinally magnetised plasma column changes its field distribution from that of a bulk wave to one typical for surface waves.
Coherent photon-phonon interactions
- Author(s): J.W. Gardner
- Source: Electronics Letters, Volume 4, Issue 18, p. 379 –380
- DOI: 10.1049/el:19680299
- Type: Article
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p.
379
–380
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Theoretical results are reported for intensity fluctuations arising from coherent photon-phonon interactions. Such interactions may occur, for example, in optoacoustic transducers with coherent input, as well as in parametric amplification and frequency-conversion systems.
Proof of the drift-resistant property of binary msequences
- Author(s): N. Ream
- Source: Electronics Letters, Volume 4, Issue 18, p. 380 –381
- DOI: 10.1049/el:19680300
- Type: Article
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p.
380
–381
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A conjecture of H. A. Barker, that any binary msequence can be shifted so as to make the identification of a system immune to linear drift, is proved algebraically, and the starting point of the sequence is given.
Regions of ultimate boundedness for the problem of Lur'e
- Author(s): S. Weissenberger
- Source: Electronics Letters, Volume 4, Issue 18, p. 381 –382
- DOI: 10.1049/el:19680301
- Type: Article
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p.
381
–382
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Regions of boundedness are found for systems of the Lur'e type when the nonlinearity leaves the Popov sector in a neighbourhood of the origin, but remains bounded there.
High-Qfactor shunt-switched N-path filters
- Author(s): R.C.V. Macario
- Source: Electronics Letters, Volume 4, Issue 18, p. 382 –383
- DOI: 10.1049/el:19680302
- Type: Article
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p.
382
–383
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At its fundamental resonant frequency, a shunt-switched N-path filter is similar to an LCR resonant circuit, except that the selectivity or Q factor achievable, which is a direct function of the passive components employed, may be very much better than normally available in tuned circuits. The limit on the maximum attainable Q factor is shown to depend on the impedance of the shunt arm switches and filter load, as well as the speed of the switches.
Improvements in near-field discrimination for radar or sonar systems by the use of separate transmitting and receiving arrays
- Author(s): D.E.N. Davies
- Source: Electronics Letters, Volume 4, Issue 18, p. 383 –384
- DOI: 10.1049/el:19680303
- Type: Article
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p.
383
–384
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A recent letter described how the near-field discrimination of a radar or sonar could be improved by the use of multiplicative signal processing. This letter shows that similar improvements can be obtained by the use of a much simpler technique employing separate transmitting and receiving arrays.
Summed sensitivity of active networks
- Author(s): A.G.J. Holt and J.K. Fidler
- Source: Electronics Letters, Volume 4, Issue 18, p. 385 –386
- DOI: 10.1049/el:19680304
- Type: Article
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p.
385
–386
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In the letter, results previously obtained for the summed sensitivity of passive networks are extended to active networks containing voltage, current, transconductance and transresistance amplifiers.
Variable-length Gunn oscillator
- Author(s): F.A. Myers ; J. McStay ; B.C. Taylor
- Source: Electronics Letters, Volume 4, Issue 18, p. 386 –387
- DOI: 10.1049/el:19680305
- Type: Article
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p.
386
–387
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By optically controlling the position of extinction of a domain in a Gunn-effect oscillator, it has been possible to measure the domain transit time and the threshold electric field as a function of active sample length. The device resistivity profile can be obtained simultaneously.
Finite-element method for waveguide problems
- Author(s): S. Ahmed
- Source: Electronics Letters, Volume 4, Issue 18, p. 387 –389
- DOI: 10.1049/el:19680306
- Type: Article
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p.
387
–389
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A numerical method is presented from which it is possible to calculate the propagation coefficients of waveguides with arbitrary boundaries and dielectric fillings.
Realisation of the circulator concept using differential-input operational amplifiers
- Author(s): A.W. Keen ; Jacqueline L. Glover ; R.J. Harris
- Source: Electronics Letters, Volume 4, Issue 18, p. 389 –391
- DOI: 10.1049/el:19680307
- Type: Article
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p.
389
–391
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A 3-port unit that satisfies the requirements of the circulator concept is realised with a differential-input operational amplifier. It provides, between two of its ports, a direct measure of reflection coefficient at the third port. One unit may be employed as a hybrid transformer; two or more units may be connected in a ring to form an n-port circulator.
Reliability parameters of equipment with a general repair-time distribution
- Author(s): F. Hoff
- Source: Electronics Letters, Volume 4, Issue 18, p. 391 –392
- DOI: 10.1049/el:19680308
- Type: Article
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p.
391
–392
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The possibility of application of Engset formulas to the calculation of reliability parameters of equipments, the repair-time distributions of which differ from an exponential one, is demonstrated.
Plasma-density determination from the phase shift in scattered radiation
- Author(s): A.R. Jones ; B.V. Stanic ; E.R. Wooding
- Source: Electronics Letters, Volume 4, Issue 18, p. 392 –393
- DOI: 10.1049/el:19680309
- Type: Article
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p.
392
–393
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Electron densities in a plasma column may be estimated from measurements of phase shift in the radiation scattered at various angles.
Erratum: Summed-sensitivity invariants and their generation
- Author(s): T. Roska
- Source: Electronics Letters, Volume 4, Issue 18, page: 394 –394
- DOI: 10.1049/el:19680310
- Type: Article
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p.
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Erratum: Generalised patterns of nonuniformity for solvable algebraic and transcendental transmission lines
- Author(s): A.G.J. Holt and K.U. Ahmed
- Source: Electronics Letters, Volume 4, Issue 18, page: 394 –394
- DOI: 10.1049/el:19680311
- Type: Article
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Erratum: GaAs Schottky diodes with linear log I/V behaviour over eight decades of current
- Author(s): B.L. Smith
- Source: Electronics Letters, Volume 4, Issue 18, page: 394 –394
- DOI: 10.1049/el:19680312
- Type: Article
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p.
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