High frequency pulse width modulation power control systems can be realized using semiconductor switches.

高频脉冲宽度调制电力控制系统，可以实现用半导体开关。

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High frequency pulse current machining and fine finishing can improve parts' machining accuracy and surface quality.

高频脉冲电流加工及光整加工技术能提高零件的加工精度和表面质量。

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A kind of high frequency pulse electrical source at the need of electromagnetic ultrasonic experiments is presented.

针对电磁超声实验对脉冲电源的需求，研制了一种高频脉冲电源。

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The machine that Dr O'Brien and Dr Frazier have designed to get round these constraints consists of a transmitter that sends out a pulse of sound at a frequency of 6 kilohertz, and an array of 52 receivers that collect the reflections from anything buried beneath the surface.

ECONOMIST: Archaeology