Some questions about Lamb waves in nondestructive testing of thin metal sheet were discussed in this paper. The calculation formula of energy distribution along thickness of sheet was advanced.
对金属薄板兰姆波探伤中的一些问题进行了探讨，提出了能量沿板厚分布的计算公式。
The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.
该文从能量守恒观点出发，讨论了副面为椭圆的环焦天线的口径场分布，并导出了计算其方向图的简单表达式。
The energy distribution formula of secondary electron of MCP is derived.
给出了MCP中次级电子能量分布表达式。
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