This paper presents a method for calculating travel time of diffracted wave from velocity model and for making diffraction migration.
本文提出一种按速度模型计算绕射波射线旅行时和进行绕射归位的方法。
The spinnability and drawability of PMMA/PET blends were studied. The orientation and crystallization structure were measured by sonic velocity method and X-ray diffraction respectively.
研究了PMMA/PET共混纤维的可纺性和拉伸性，并测定了拉伸丝的力学性能、取向和结晶结构。
The spinnability and drawability of PMMA/PET blends were studied. The orientation and crystallization structure were measured by sonic velocity method and X-ray diffraction respectively.
研究了PMMA/PET共混纤维的可纺性和拉伸性，并测定了拉伸丝的力学性能、取向和结晶结构。
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