Distortions and noises on fluidic pulse signal transmissions frequently cause a decrease in performances of a digital fluidic control system: that is, a misoperation of the switching motion in fluidic elements due to the signal noises, a timing error of control actions due to the signal distortion, etc.
In this study, a new method of design on a fluidic pulse signal transmission filter has been developed for the purposes of a removal of transmission distortions and high frequency noises. This filter is designed to have a flat characteristic curve in amplitude in the pass frequencies and in group delay in the all ranges. The design method and its procedure are similar to those of the analog transmission filter which have already been developed.
The characteristic tests of designed filters have represented good transmission results.

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From a shut down test of generator and electric load in the power system, it is well known that the power disturbance is transmitted from the test point to the other points with constant delay time. The phenomena shows that the electric power system has a similar dynamic characteristic to the distributed constant circuit. On the other hand, in the case of a simulation with lumped constants, such as the detailed conditions in connected generators must be understood, and the analysis becomes complicated. In this paper, the electric power system is expressed with the distributed constant circuit, so that the main disturbance characteristics are obtained without difficulty. Moreover, the possibility of suppressing the disturbance is discussed by employing active sink method.

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Railway signalling systems have been damaged by lightning. Therefore, effective and economical lightning protection measures are necessary for railway signalling systems. To analyze lightning risk and study countermeasures against lightning damage, the authors therefore observed lightning overvoltage in electrified railway signal cables, electrical power lines and rails. Based on the result of these observations, the correlation between lightning overvoltage and lightning conditions was clarified, a methodology for estimating the probability of lightning hazards occurring was proposed, and it was found that according to statistics, there was no significant variation in overvoltage observed between electrified and non-electrified sections of railway.

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スラグ同調回路は, 大電力またはハイ・チャネル用TV送信機の高周波出力同調回路に使用すると便利な回路である.しかし同軸給電線の途中にコンデンサがあるために, その設計・調整方法を理解するのが比較的困難であるから, この回路を解析し, 設計調整に必要な資料を得ておけばきわめて便利だと考えられる.本文は必要な帯域特性を得るためのスラグの位置, キャパシタンス等に関する資料を算出し, スラグ同調回路の設計, 調整法を述べたものである.

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