基于HY-SWMM的居住小区暴雨内涝模拟及小区防洪涝研究

选取郑州市高新区盛和苑小区为研究对象,创建HY-SWMM(鸿业海绵城市/暴雨模拟软件),通过重现郑州“7·20”暴雨的雨量,模拟居住小区的内涝时空演变,得到相应的径流与积水数据。经过对居住小区在暴雨事件下的HY-SWMM内涝模拟计算结果分析,结合城市内涝成因,提出居住小区在暴雨内涝下的应对策略,以提高居民在城市暴雨内涝时的防灾能力与承灾韧性,对城市暴雨内涝防灾策略进行一定的补充。     

Preparation of graphene on SiC by laser-accelerated pulsed ion beams

Laser-accelerated ion beams (LIBs) have been increasingly applied in the field of material irradiation in recent years due to the unique properties of ultra-short beam duration, extremely high beam current, etc. Here we explore an application of using laser-accelerated ion beams to prepare graphene. The pulsed LIBs produced a great instantaneous beam current and thermal effect on the SiC samples with a shooting frequency of 1 Hz. In the experiment, we controlled the deposition dose by adjusting the number of shootings and the irradiating current by adjusting the distance between the sample and the ion source. During annealing at 1100 ℃, we found that the 190 shots ion beams allowed more carbon atoms to self-assemble into graphene than the 10 shots case. By comparing with the controlled experiment based on ion beams from a traditional ion accelerator, we found that the laser-accelerated ion beams could cause greater damage in a very short time. Significant thermal effect was induced when the irradiation distance was reduced to less than 1 cm, which could make partial SiC self-annealing to prepare graphene dots directly. The special effects of LIBs indicate their vital role to change the structure of the irradiation sample.     

基于SiC材料的激光加速质子束辐照特性研究

通过辐照核能材料SiC, 表征激光加速质子束连续宽能谱、短脉冲和高瞬态流强的特点。将SiC样品放置在距离靶体4 cm处, 连续进行300发满足指数能谱分布的能量为1~4.5 MeV的激光加速宽能谱连续质子束辐照。表面和截面拉曼光谱显示辐照后的SiC散射峰强度减小, 且拉曼光谱截面测量的整体趋势可以与SRIM模拟的能谱加权后的深度能损分布对应, 从而通过实验对能量连续分布的激光加速质子束进行表征。此外, 实验结果显示, 激光加速质子束的短脉冲特性可在SiC表面产生相当高的瞬时束流密度。这种快速的宽能谱辐照为模拟反应堆中子辐照提供了可能性。