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.
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The UK does have an extensive network of flood defences but there is a patchwork of organisations - including farmers, water companies and charities - responsible for them.。关于这个话题,爱思助手下载最新版本提供了深入分析
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