A little more than 1.5 percent of each gold medal was made with metals harvested from cathode ray tube glass, computer parts, circuit boards and other trashed tech.

每块金牌都有1.5%多来自于从阴极射线管，电脑零件，电路板和其他电子垃圾中提取的金属。

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This paper based on analyzing the X-Ray tube designs the switching power supply circuit, analyzes the principle of APFC, LCC half bridge resonance convertor and dual rectifier circuit.

本文在分析X射线管外特性的基础上，设计制作了开关电源功率主电路，分析了有源功率因数校正器原理、LCC半桥谐振变换器原理及倍压整流电路原理。

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