sound diffraction

Sound velocimeter and X-ray Diffraction ( XRD) were used to measure the crystallization and orientation of the fiber.

通过采用声速仪、X-射线衍射（WXRD）等分析与检测手段对纤维取向度和结晶度进行了测定。

Influences of sound diffraction by elastic spherical shell on acoustic vector sensor measurement

弹性球壳声衍射对矢量传感器测量影响

Here, the sound pressure field and particle velocity field of sound diffraction by an elastic spherical shell are studied theoretically.

以实际应用需求为背景，从理论上分析了平面声波在弹性球壳上的衍射声压场和振速场；

The structure and properties of fiber of IPP ( Z30S) blent with different content of chemical degrading modifying adduct have been studied by the way of density, velocity of sound, Xray diffraction and stressmeter.

采用密度法，声速法，X射线衍射，强力试验仪研究了化学降解改进剂含量不同的等规聚丙烯IPP（Z30S）共混纤维的结构和性能；

PAN fibers with different drawing ratio and different preoxidation degree were investigated by means of sound velocimeter and X-ray diffraction meter.

采用声速仪及X射线衍射仪对不同牵伸倍数和不同预氧化程度的PAN纤维进行取向度和预氧化程度的测试，并将其结果进行对比。

The influences of sound diffraction by a spherical shell on the measurement results and directivity of AVS were calculated by using the approximate equation of mechanical impedances of the thin spherical shell.

采用薄壁球壳机械阻抗近似公式，计算了球壳声衍射对矢量传感器声场测量和指向性的影响。

Approximate Calculation of the Sound Field of Diffraction of Barrier

声屏障衍射声场的近似计算