The calculation models are set up on average speed and Max speed in back field and jet effect distance, new theoretical reference is provided for effective ventilation in heading fa.
给出了回流区平均速度、最大回流速度及射流作用距离的计算模型，为掘进工作面合理有效通风提供了新的理论依据。
This was because the subjects' circadian rhythms - which determine patterns of alertness and tiredness - had been disturbed, creating an effect similar to jet lag.
这是因为人体生理节奏--决定人机敏性和疲倦性的程序已经被打乱了，导致了一个像时差的后果。
Special testing apparatus was built to study the effect of arc divided flow on the jet fluctuation and the inhibiting effect of new spray gun on the jet fluctuation.
为了研究电弧分流对射流脉动的影响以及检验新喷枪对射流脉动的抑制作用，而建立了专门的试验装置并进行了相关的试验。
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