Mechanical behavior of thin CoCrFeNi high-entropy alloy sheet under laser shock peening

It is a challenge to optimize the mechanical performance of high entropy alloys (HEAs). Here, we obtain yield strength enhancement along with considerable tensile ductility of CoCrFeNi HEA by laser shock peening (LSP). The surface hardness of the material is also increased significantly by 40% after LSP. Based on microstructure analysis, it is observed that the grain refinement and the mixed deformation mode of dislocation slip and deformation twin are the main strengthening mechanisms after being treated by LSP. This study demonstrates an effective method for tailoring the mechanical properties of HEAs

生态草业的特色产业体系与设计:以正蓝旗为例

基于生态学原理的环境友好型生态草业,很少或基本不造成环境污染,并能维持较高的初级生产力,保持初级生产与次级生产的有机链接,同时考虑城市消费市场,提高单位土地面积的经济产出.通过产业调整,可以实现利用少量土地,保护大量天然草原,促进退化草原恢复,并提高牧民收入的目标.本文介绍了草原管理中的生态系统设计理念、特色生态草业及其构成;生态草业的经济与生态效益;并以内蒙古正蓝旗为例,设计了主要特色产业,即草业、肉奶禽业、生物产业、生态旅游业和草-牧-科-工-贸联营体,即"四业一体"生态草业.通过规划调整,使项目区牧业经济效益,在保护前提下,提高50%~70%,最终目的实现草原生态与经济效益双赢,增加中国食物供应能力

紫外写入技术制备光波导器件研究

研究了采用PECVD方法生长的Si基SiO2波导材料的光敏特性．经过高压载氢处理，利用KrF准分子激光脉冲（工作波长为248nm）在波导材料中诱导出的折射率变化量达到0．005，相对值约增加0．34％．详细研究了紫外光诱导出的折射率变化沿样品深度方向的分布情况．最后，采用紫外写入法在PECVD方法生长的Si基SiO2波导芯层中制备出了单模波导和Y分束器样品，并观测到了通光现象，实测结果与模拟结果一致

大量相干光源驱动和种子激光系统

The photoinjector and seed laser systems of DCL