Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.
第五十七条 违反本法第十一条至十三条的规定，扰乱实名注册等制度的，由公安机关没收违法所得，并处违法所得一倍以上十倍以下罚款，没有违法所得或者违法所得不足二万元的，处二十万元以下罚款；情节严重的，并处十五日以下拘留。，推荐阅读同城约会获取更多信息
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Source: Computational Materials Science, Volume 267