...f = o 4 4 54 ′ = o θ 对于完全取向的材料 对于完全未取向的材料 非晶区的取向度 取向度的测定 声速法(Sound velocity method) 分子的取向度 光学双折射法(Birefringence anisptropic method) 链段的取向度 广角x-射线衍射法(Wide-angle X-ray diffraction)...
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环鸣测量声速法具有电路简单、使用方便、测量精度高等优点，已广泛地应用。
Sing-around method for sound velocity measurement have found wide acceptance because it is simple in circuitry and high in accuracy.
通过声速法和X射线衍射实验测试纤维的取向和结晶，结合纤维结构及纤维应用讨论了两种PET纤维的模量-应变曲线特点。
The orientation and crystallinity of the PET fibers were measured by sonic and X-ray diffraction. The feature of modulus-strain curves were discussed from the fiber structure and applications.
本文采用改进的流线曲率法对跨声速多级轴流压气机非设计点进行了性能模拟。
An improved streamline curvature numerical method is modified and applied to better approximate the flow fields of multi-stage transonic axial compressors.
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