This paper also discusses the principle of the electromagnetic power unchangeableness to some extent.

文章还对坐标变换过程中的电磁功率不变性原则进行了讨论。

The bending of simple supported beam make the resonance peak wavelength of each mode of TFBG shift and resonance peak amplitude unchangeableness.

简支梁的弯曲只让TF BG各模式的谐振峰波长发生了漂移，而各模式的谐振峰的幅度没有改变。

The test indicates that the method not only can reach to a satisfactory speeding effect, but also can keep very well the failure mechanism unchangeableness.

试验证明，该方法不仅可以达到令人满意的加速效果，而且还极好地保持了失效机理的不变性。