On the assumption that there was a small solid sphere in the focusing area, the scattering field of concave sphere ultrasonic transducer was analyzed. 以凹球面超声换能器为研究对象，假设聚焦区存在一刚性球形微粒，对此时的散射场进行分析。
From the Fourier space K corresponding to the scattering field of the object, an imaging evaluation mechanism based on the spatial spectral coverage is proposed. 摘要从物体散射场对应的傅里叶空间出发，提出基于空间谱域分布的成像系统定性评价体系。
Finally, a method has presentedalso for the fringing field distribution measured experimentally in magneticfield. 最后叙述了由实验测量得到磁场的边缘场分布时有限积分数值的计算方法。
The area pictured is one-thousandth of Kepler's full field of view, and shows hundreds of stars at the very edge of the constellation Cygnus. 本图区域面积约为整个视图的千分之一，显示出天鹅座相当边缘区域的数百颗恒星。
