利用对应原理和FFT技术计算出了无限均匀各向同性介质中双力偶点源产生的位移场，并结合若干实例进行了分析和总结。
According to the correspondence principle and FFT, the author have calculated the displacement field of a double-couple point source in homogeneous, isotropic, unbounded medium.
点力源在均匀横向各向同性介质中激发的弹性波可以用透射-反射矩阵法进行求解。
Elastic waves from a point force in transversely isotropic, homogeneous media can be solved through the reflectivity-transmittivity matrix approach.
根据不同类型的矢量球波函数，建立无源各向同性球层内以及自由空间内的电磁场在球坐标系下的级数表达式。
In source-free plasma anisotropic medium, the electromagnetic fields can be expressed as integral of the first and the second spherical vector wave functions.
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