The basic acoustic theory and principle used in reconstruction of cross-section velocity field are also presented.

详细介绍了声波法重建断面速度场的理论知识和基本原理。

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According to acoustic structure theory base, acoustic principle of multi-holes acoustextile and nonwovens characteristics, nonwovens acoustic theory are analysed in the paper.

根据吸声结构理论基础以及多孔吸声材料的吸声机理，结合非织造布的结构特点，系统分析了非织造布的吸声原理。

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On the basis of acoustic theory, combined with lab experiments and theoretical derivation, the dissertation presents a thorough study of the mechanism of ultrasound's effect on viscosity reduction.

该论文以声波原理为指导，结合室内实验和理论推导，深入探讨了超声波降粘的作用机理和作用效果。

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In 2008, Dr Cummer first described the theory of acoustic cloaking in an article in Physical Review Letters, and earlier this year a group from the University of Illinois Urbana-Champaign demonstrated the first practical use of the theory in an article in the same journal.

BBC: Acoustic 'cloaking device' shields objects from sound