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进而建立了非均匀波纹慢波结构返波管的线性理论，给出非均匀慢波结构返波管中起振电流的计算表达式。
Furthermore, we established a linear theory of the non-uniform slow wave structures and formulated the expression of the starting current.
当波从小扰动源向各个方向均匀传播时，其强度的变化与距离的平方成反比。
When a wave travels uniformly in all directions from a small source, the intensity varies inversely as the square of the distance.
本文研究非均匀磁场中非线性剪切阿尔芬波。
Nonlinear shear Alfven waves in an inhomogeneous magnetic field have been investigated.
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