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doi: 10.1177/002029407801100702pmid: N/A
A method of time delay generation is described that is not dependent on a Pade or similar approximation. It is shown that the use of a serial analogue to digital conversion technique known as Delta Modulation can result in a simple and low cost alternative to the parallel conversion methods normally applied and it is stated that the time delay system described can be used on a low cost analogue computer with the addition of only one shift register.
Dhanendran, M.; Hutton, W. C.; Paker, Y.
doi: 10.1177/002029407801100703pmid: N/A
The distribution of force under foot is an important parameter for assessing different surgical procedures on it. In order to develop a clinical tool to do this completely and accurately, a system has been developed based on resistance strain gauge load cells. These have an exposed area 15 × 15 mm square and have been assembled in square modules of 16. Eight such modules (128 load cells in all) have been brought together in a 4 × 2 arrangement to form a load sensitive area 250 × 125 mm. To condition and process the data the load cells have been connected through amplifiers, a multiplexer and an analogue to digital converter to a PDP 11/40 minicomputer. This has been programmed to give as one option a hard copy graphic representation of the actual outline of the foot with the force readings printed in a superposed matrix. Force/time curves can also be plotted for individual cells.
Saleh, Mahmoud A.; Zaher, Farouk A. E.; Mansour, Ahmed E. B.
doi: 10.1177/002029407801100704pmid: N/A
The effect of each of the equivalent circuit parameters of a two-phase servomotor on its electromechanical time-constant is investigated. It is shown that the value of the rotor resistance has a marked effect on the time-constant. There exists a certain value of the equivalent rotor resistance, within the practical range, at which the motor time-constant becomes minimum; this value of rotor resistance is obtained in terms of other para meters. A new criterion is proposed when designing a 2-phase servomotor, namely, the minimum time-constant condition.
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