最近一个周期中，M82的重力增强了M81周围密度波的脉动，导致M81的旋臂更浓密。
Last go-round, M82's gravity likely raised density waves rippling around M81, resulting in the richness of M81's spiral arms.
最后得出对转矩脉动最优的斩波方式为PWM—ON—PWM，并在三个位置传感器的条件下运用位置预测法实现。
Finally it is concluded that PWM-ON-PWM is the existing optimal PWM mode for reducing commutation torque ripples, and achieves this mode on condition of three position sensors.
本文报道了对CO_2激光泵浦hcooh分子亚毫米波激光器自脉动与混沌实验的新观察研究结果。
Some new experimental observations on pulsation and chaos of CO_2 laser pumped HCOOH molecule laser are reported in detail.
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