Based on the method of SVPWM, various forms of phase voltage waveforms are generated by adjusting the duty time of the two zero vectors and the duty order of every vector.

在空间电压矢量形成PWM波的基础上，通过两个零矢量作用时间的不同分配及调节各矢量作用顺序，形成了不同形式的相电压波形。

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The difference of leading switches and lagging switches to realize the zero-voltage switching and the reason of duty-cycle loss is emphatically argued.

重点讨论了超前管、滞后管实现零电压开关的差异以及副边占空比丢失的原因。

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It allows certain specified goods to be imported for processing or incorporation into finished products at the rate of Customs duty that would be applicable to the finished product, that is, zero, instead of the rate for the imported goods.

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In a letter to Steven Newman, CEO of Transocean, Rahall said records from the rig indicate 18 people at work on the second shift with "zero engineers, electricians, mechanics or subsea supervisors" on duty the night of the explosion.

CNN: Rig survivors: BP ordered shortcut on day of blast