sound focusing

Influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field generated by a self-focused concave spherical radiator has been studied through numerical simulation with Ray-leigh integral.

以凹球面自聚焦超声换能器为例，用瑞利积分进行数值模拟计算，研究声衰减、声速、温度等参数对声聚焦的影响，并对不同生物组织中声聚焦的特点进行了比较。

Based on the reference [ 1], author presents and proves the sound focusing law for the hall, when the plan of the hall is a n regular polygon inscribed in a circle and the sound source is in the center of circle.

本文以参考文献[1]为基础，提出和论证了平面为圆内接正多边形且声源位于圆心时的厅堂声聚焦规律。

Optimal Analysis on the Performance Characteristics of Irreversible Semiconductor Thermoelectric Refrigerator and Generator; Laser Breakdown-Generated Sound in Different Optical Focusing Lens Systems

不可逆半导体制冷器和温差发电器性能特性的优化分析不同光聚焦状态的光击穿声辐射特性

Sound Focusing Theorem for the Hall where the Plan Is a n Regular Polygon Inscribed in a Circle

平面为圆内接正n边形（n为≥7的奇数）的厅堂声聚焦定理

Moreover, ANR effect also can be used for sound focusing by flat lenses.

此外，声负折射效应也可以用于平板声聚焦等方面的研究。