Stepping motor is applied to fuze safety and arming system as a low power motor at low frequency.

步进电机在引信安全系统中是一种小功率的低频应用。

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The radiation efficiency of the radiation modes falls off very rapidly with the increase of modes order at low frequency.

由于在中、低频时，声辐射模态对应的辐射效率随着模态阶数的增加而迅速降低。

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The PP-IP characteristics at low frequency high pulse current and the emission spectra at direct current have been investigated and analyzed.

研究和分析了它们在低频大电流脉冲注入下的Pp—Ip特性和直流注入下的光谱特性。

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The DA-F60 incorporates neodymium magnets and a passive radiator to produce results typically found in high-end Hi-Fi audio systems, including tuned low-frequency reproduction and virtually no distortion even at high volumes.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first

Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.

ECONOMIST: The American navy may soon have a whale of a problem