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。

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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。

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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。

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