In this paper, we divided the double frequency crystal into numerous small double frequency units and derived the harmonic power and the double frequency efficiency in each unit.

本文中将倍频晶体分割成无数多个小倍频单元，并导出每个倍频单元中的谐波功率与倍频效率。

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The paper introduced a frequency measure system composed of double 8051 chips, presented the realized schemes of the hardware and software, and analyzed system 's efficiency.

本文介绍了一种由双8051芯片构成的频率测量系统，给出了其软硬件系统实现的方案，并对该系统效率进行了分析。

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This research will play instructive effect at improvement of crystal double frequency conversion efficiency.

所做的研究对提高晶体的倍频效率具有指导意义。

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The Swiss Federal Railways has improved efficiency in recent years too, by using double-decker trains and increasing its trip frequency.

BBC: Are the Swiss really that efficient?