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• ### Straws in the Wind

Publication Year: 1972, Page(s):389 - 390
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First Page of the Article
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• ### An automatic biochemical analyser

Publication Year: 1972, Page(s):391 - 402
| | PDF (2438 KB)

A machine for the automatic analysis of human blood and other body fluids is described. Brief reference is made to the associated biochemistry. The problems of measurement of sample optical density and the control of sample temperature, are discussed, and the considerations leading to the choice of photo-cells for the analysers are considered. The analysing equipment and the means of achieving pos... View full abstract»

• ### Seeing in the dark

Publication Year: 1972, Page(s):403 - 408
| | PDF (1961 KB)

A survey of the current state-of-the-art in night vision technology is presented, including both direct vision and low light-level television systems. Possible developments in thermal imaging techniques are discussed. View full abstract»

• ### Design of active distributed RC-filters using exponential lines

Publication Year: 1972, Page(s):409 - 415
| | PDF (601 KB)

New active distributed RC-structures utilizing exponential RC-lines and operational amplifiers are proposed for realizing band-pass transfer functions and transfer functions having both a pair of complex poles and a pair of complex zeros. It is shown that the magnitude of the amplifier gain for a given pole Q decreases with increasing taper. In the case of the structures realizing both complex pol... View full abstract»

• ### A formal method for designing sequential circuits from synchronous flip-flops such as the J-K type using a hybrid synchronous-asynchronous technique

Publication Year: 1972, Page(s):416 - 418
| | PDF (284 KB)

A formal method is presented which simplifies the realization of many counter sequences in asynchronous form from synchronous flip-flops such as the J-K or D type, without requiring the use of preset or clear connexions to establish the sequence. The method is demonstrated by using the procedure to obtain asynchronous circuits in terms of J-K flip-flops for counters operating in the 8-4-2-1 and 5-... View full abstract»

• ### A pseudo-random pulse train generator with controllable rate for modelling of audiometric systems

Publication Year: 1972, Page(s):419 - 424
Cited by:  Papers (1)
| | PDF (569 KB)

Design details are given of a pseudo-random pulse train generator. The generator produces a sequence of 0Â¿ and 1Â¿ pulses which occur at uniform time intervals, and with a controllable average rate of 0Â¿s to 1Â¿s, but in which the detailed distribution of 0Â¿s and 1Â¿s is essentially random. The system is such that the output pattern can be repeated. The instrument has been developed to si... View full abstract»

• ### Statistical Stability in spectrum analysis

Publication Year: 1972, Page(s):425 - 429
| | PDF (594 KB)

Some very simple results which are of use in designing the smoothing system for a digital spectrum analyser, to reduce fluctuations due to the random nature of the envelope of the output of a narrow-band filter are deduced. The `signal/noise ratioÂ¿, defined on a mean square basis, of each observation of envelope-squared is unity. The smoothing schemes operate by averaging several observations of ... View full abstract»

• ### Cascade synthesis of driving point functions using non-uniform RC transmission lines

Publication Year: 1972, Page(s):430 - 432
| | PDF (325 KB)

Necessary and sufficient conditions, as well as a synthesis procedure, for realizing a class of driving point functions as a cascade of non-uniform RC transmission lines, are presented. By using known transformations, the results may also be applied to other types of lines, such as lossless lines. View full abstract»