Objective the variations of the site and shape of focal region for a concave spherical ultrasound transducer in the case of high sound intensity and stronger attenuation were studied.
目的研究凹球面超声换能器的声焦域在高声强和媒质有较大衰减情况下，其形状和几何位置的变化。
2
An analysis is made on the influence of low temperature environment on the property of natural gas spherical tank used in the frigid region.
分析了寒冷地区的低温环境对天然气压力球罐性能的影响。
3
Every space model can be divided into several regions. Each region is equivalent to a group of spherical four-bar linkages.