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.
Donald Trump has spent much of his second term at war with science and scientists. He is cutting staff at institutions such as the Environmental Protection Agency (EPA) by a third, and has cancelled or frozen up to 8,000 federal research grants. This hasn’t just hurt individual research programmes, it has damaged America’s credibility as a reliable partner in the scientific community. It is not surprising that many researchers – one poll last year by the journal Nature gave the number of 75% – say they are considering leaving the US entirely.
，详情可参考搜狗输入法下载
// Write data — backpressure is enforced
Read full article
“我忏悔，我自放假回家以来就没打开过书包”“我忏悔，连续三天吃螺蛳粉熏哭室友”“我忏悔，绩点崩盘、实习被拒”……一段段匿名文字，刷屏式的情绪共鸣，深夜里的真诚袒露，让“赛博忏悔室”成为数字时代一个隐秘而柔软的精神角落。