排序方式: 共有2条查询结果,搜索用时 78 毫秒
1
1.
Relativistic electrons moving over a periodic metal grating can lead to an intriguing emission of light, known as Smith–Purcell radiation [SPR), the precursor of the free-electron laser.The speed of light plays a critical role in the far-field emission spectrum. Inspired by this photonic SPR, here we experimentally demonstrate a photoacoustic phased array using laser-induced shock waves. We observe acoustic radiation spectrum in the far field, perfectly predicted by a universal theory for the SP... 相似文献
2.
本文通过对现代初中生行为习惯进行归纳其具体表现,并分析了形成这些习惯的具体原因来自于家长、社会、学校.根据这些原因找到了矫正的具体方法,通过这些方法的实施会让现代初中生的行为习惯有很大的转变. 相似文献
1