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# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 34
• ### Application of incoherent-scatter data to communication

Publication Year: 1971, Page(s):1319 - 1322
| | PDF (424 KB)

The application of a very sensitive radar system to the observation of signals incoherently scattered in the ionosphere is briefly described. This technique can give more detailed information about height and time variations of bottom-side electron-density profiles than any other method, besides measuring several further parameters of the plasma. Electron-density profiles of the day-time lower Ere... View full abstract»

• ### Use of flayer theory in ionospheric predictions

Publication Year: 1971, Page(s):1323 - 1326
| | PDF (690 KB)

Worldwide predictions of h.f. and m.f. radio propagation conditions require extensive data on the space and time variations of ionospheric parameters such as foF2 and hmF2. Theoretical values of these parameters can be obtained by solving equations that represent the effects of various physical processes governing Flayer behaviour. The effects of winds, which are driven by the daily heating of the... View full abstract»

• ### Theory of cylindrical antennas with arbitrary impedance loading

Publication Year: 1971, Page(s):1327 - 1332
| | PDF (661 KB)

A method of analysing cylindrical antennas with distributed impedance loading is presented. The loading is assumed to be an arbitrary but differentible function of position along the antenna. As an illustration, the most important class of such antennas in practice, the broadband cylindrical antennas with distributed resistive or capacitive loading, for which exprimental data are available, are an... View full abstract»

• ### Analysis of multicomponent wavefields

Publication Year: 1971, Page(s):1333 - 1338
Cited by:  Papers (2)
| | PDF (921 KB)

The problem considered is that of clculating the angles of arrival of a multimoded signal at an antena array from simultaneous measurements of the amplitude and the phase of the signal in each element of the array. A general solution with wide application is described. View full abstract»

• ### Factors influencing conversion efficiency in gaseous-plasma harmonic generators working at microwave frequencies

Publication Year: 1971, Page(s):1339 - 1344
| | PDF (800 KB)

This paper describes a novel application of the field-gradient theory of plasma microwave harmonic generation, proposed by Krenz and Kino, to the case of a positive column placed through a rectangular waveguide. The distribution of 2nd-harmonic power between the TE01 and TE11 waveguide modes has been examined experimentally and found to be in agreement with qualitative predictions made from the gr... View full abstract»

• ### Relative-phase measurement at Q band

Publication Year: 1971, Page(s):1345 - 1350
| | PDF (759 KB)

A single-sideband suppressed-carrier ferrite modulator is used in a Qband serrodyne phase bridge. By suitably processing the bridge-detector output, relative phase in the unknown bridge arm may be measured to within 1% of its true value, despite nonlinearities in both the static insertion-loss and phase-shift characteristics of the modulator. The modulator drive is not critical. View full abstract»

• ### V.L.F. propagation parameters derived from observations of sunrise and sunset phenomena

Publication Year: 1971, Page(s):1351 - 1357
| | PDF (838 KB)

Received v.l.f. signals during sunrise and sunset times over the propagation path are used to deduce information about the attenuation coefficients and phase velocities of the day and night waveguide modes, as well as the conversion factors between these modes at the day/night transition. Unlike any previous method used to obtain modal propagation constants, the present method does not need a mobi... View full abstract»

• ### Binary nonconsecutive one code for time-tag data compression

Publication Year: 1971, Page(s):1358 - 1360
Cited by:  Papers (1)
| | PDF (329 KB)

A simple time-tag data-compression scheme which uses a binary nonconsecutive one code is introduced to provide higher data compression ratios than similar schemes which have been suggested. This data-compression scheme should be very easy to implement. In addition, it does not require a priori knowledge of the information source. View full abstract»

• ### Perception efficiency for radio and television displays

Publication Year: 1971, Page(s):1361 - 1362
Cited by:  Papers (1)
| | PDF (261 KB)

Tests of the effect of time stress on human performance in the recognition situation were carried out using a standard television display with accompanying audio and noise sources, the student responding with a standard key punch. Reaction time and psychological moment measurements are reported and discussed. View full abstract»

• ### Parametric graphical computer display system using analogue storage

Publication Year: 1971, Page(s):1363 - 1372
| | PDF (1296 KB)

A cathode-ray-tube graphical display system for use as a digital-computer output terminal has been developed The display employs analogue function-generation circuits to produce line drawings composed of straight-line and curved-line segments which are specified by parameters transferred from the computer in analogue form. To maintain a flicker-free image, while also imposing a minimal demand on t... View full abstract»

• ### Computer-controlled queuing systems with feedback

Publication Year: 1971, Page(s):1373 - 1377
| | PDF (545 KB)

A generalised approach is presented for the study of a computer-controlled queuing system with general input, first-come-first-servedÂ¿ queue discipline and multiple servers with feedback for either exponential servers or constant service times. Two generating functions for the state probabilities of the system corresponding to the two different types of service times are derived. Further, necess... View full abstract»

• ### Waiting-time distribution in computer-controlled queuing system

Publication Year: 1971, Page(s):1378 - 1382
| | PDF (483 KB)

The paper presents two formulas for the determination of the waiting-time distribution in a computer-controlled queuing system with Poisson input, multiple-exponential servers and first-come-first-served queue discipline. The formulas obtained are expressed in terms of the stationary-state probabilities of the computer-controlled queuing system. One of the formulas is derived by means of the formu... View full abstract»

• ### Corrigendum: Use and design of 4-wire telephone trunk concentrators

Publication Year: 1971
| PDF (57 KB)
• ### Method of using redundancy in very large computer stores

Publication Year: 1971, Page(s):1383 - 1392
| | PDF (1167 KB)

The organisation of a very large random-access computer store which uses redundancy in the form of error-correcting codes is described. The improvements in manufacturing yield which can be achieved by means of such redundancy are emphasised in the form of examples. However, with typical basic store sizes in the capacity range 107Â¿108 bits, some of the most significant improvements in manufacturin... View full abstract»

• ### Techniques for the measurement of source and drain series resistance in m.o.s. transistors

Publication Year: 1971, Page(s):1393 - 1398
| | PDF (701 KB)

Three methods for measuring the source and drain resistance of m.o.s. transistors operating in the unsaturated region are described. The results obtained on a number of simple m.o.s. transistors are presented to illustrate and compare each method and to indicate the significance of such measurements. View full abstract»

• ### Simple estimators for error probability in simulation studies of digital communication systems

Publication Year: 1971
| PDF (180 KB)
• ### Thermal insulation for energy storage

Publication Year: 1971, Page(s):1399 - 1407
| | PDF (1163 KB)

Efficient thermal-energy storage requires effective thermal insulation. From a consideration of the possible heat-transfer modes, the requirements for a thermal barrier can be deduced. In a good conventional thermal insulation, most of the heat transfer takes place by conduction through the gas (air) in the insulation voids, the conductivity of the stillÂ¿ gas representing the limiting performanc... View full abstract»

• ### Space harmonics in unified electrical-machine theory

Publication Year: 1971, Page(s):1408 - 1412
Cited by:  Papers (8)
| | PDF (655 KB)

The paper deals with the applicability of unified machine theory to electrical machines where space harmonics can not be neglected. It is shown that there exists cases where a linear transformation can de determined to transform the set of time-depended linear differential equations for a machine at constant speed into a set of linear time-invariant differential equations, even if space harmonics ... View full abstract»

• ### Performance of d.c. linear machines based on an assessment of flux distributions

Publication Year: 1971, Page(s):1413 - 1420
| | PDF (726 KB)

An analytical study is described of the magnetic-field system in a d.c. linear motor. The equations derived are solved by numerical techniques based on a finite-difference approximation. A modification of existing methods is adopted to deal with heterogeneous regions of permeability. The computed flux profiles are shown to compare favourably with experimental results obtained on a 2-pole machine, ... View full abstract»

• ### Design of microalternator for power-system-stability investigations

Publication Year: 1971, Page(s):1421 - 1441
Cited by:  Papers (23)
| | PDF (2260 KB)

The paper describes the design of a microalternator in which negative-resistance devices are employed to obtain representative constants of the model's rotor circuits. Dimensional scaling in assessing the parameters of model alternators is reviewed. Methods of calculating the model's principal constants from design data are outlined for a machine of salient-pole-rotor construction. Core and short-... View full abstract»

• ### Comparisons of synchronous-machine models in the study of the transient behaviour of electrical power systems

Publication Year: 1971, Page(s):1442 - 1458
Cited by:  Papers (16)
| | PDF (1886 KB)

Methods of modelling power systems in the study of the system transient behaviour are reviewed. Six machine models of varying complexity are developed from the fundamental machine equations. Factors in the form of the machine equations, which critically influence the economy of solution, are identified, The relationship between the machine and system equations is examined in relation to the digita... View full abstract»

• ### Synchronous-machine sudden 3-phase short-circuit. Analysis by norton's, constant-flux-linkage and thÃ©venin's theorems

Publication Year: 1971, Page(s):1459 - 1466
Cited by:  Papers (1)
| | PDF (775 KB)

The paper presents a new technique of analysis. Equivalent circuits, which normally omit altogether the asymmetrical and 2nd-harmonic armature-current components, are made to give the complete solution including the said components by applying theorems which are well known for their simplifying effect. In the first alternative, Norton's theorem is used to replace the 3-phase armature-voltage sourc... View full abstract»

• ### Transient stability of power systems containing both synchronous and induction machines

Publication Year: 1971, Page(s):1467 - 1474
Cited by:  Papers (13)
| | PDF (882 KB)

A method is described of calculating the effect of large induction motors on the transient performance of a multimachine power system under fault conditions. The representation of an induction motor is similar to that used for synchronous machines, and is therefore suitable for describing composite systems. The method is based on Park's equations and, unlike earlier methods, allows for the `deep-b... View full abstract»

• ### Discussion on "Starting methods for generator/motor units employed in pumped-storage stations" and "Investigation into damping-torque coefficients and stability of a 2-synchronous-machine system employed in synchronous starting"

Publication Year: 1971, Page(s):1475 - 1485
| PDF (1929 KB)
• ### Design and parameters affecting the surface stress of overhead-power-line conductor systems

Publication Year: 1971, Page(s):1486 - 1492
Cited by:  Papers (1)
| | PDF (893 KB)

To prevent undue radio interference and energy loss from overhead conductors, the permissible operating stress must be minimised. Therefore, the design of such conductors was investigated theoretically using a conformal transformation proposed by Timascheff. First, the effect of the design parameters, that is, the subconductor diameter, subconductor spacing, number of subconductors and phase spaci... View full abstract»

## Aims & Scope

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

Full Aims & Scope