The test results show that a change in two parameters-the gain and the phase Angle of the feedback control-will have an effect on the stability of the active flutter suppression system.

实验结果表明：改变反馈控制的增益和相位角两个变量，能影响主动颤振抑制系统的稳定性。

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The linewidth of an external cavity semiconductor laser(LD) is presented quantum-mechanically. The best feedback conditions are given for the suppression of LD linewidth.

本文用量子力学的方法求得了外腔半导体激光器（LD）的线宽，给出了抑制LD线宽的最佳反馈条件。

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