全金属结构氩离子激光器输出功率与磁场强度的关系

将氩离子激光器置于轴向磁场中,不仅可以减少离子对管壁的轰击,延长激光器的寿命,而且能提高激光器的佃出功率和转换效率,本文从引入磁场后激光器内电子数目增加、磁场对电子空间分布的影响及塞曼效应三个方面作了理论分析,证实存在一最佳磁场,理论结果与实验结果基本相符。     

Evaluation of the Consequences of a Cistern Truck Accident While Transporting Dangerous Substances through a Tunnel

The transportation of dangerous substances by truck carriers harbors important safety issues in both road and mine tunnels. Even though traffic conditions in road and mine tunnels are different, the potential geometric and hydrodynamic similarities can lead to similar effects from the uncontrolled leakage of the dangerous material. This work was motivated by the design study of the LAGUNA‐LBNO (Large Apparatus studying Grand Unification and Neutrino Astrophysics and Long Baseline Neutrino Oscillations) project. The considered neutrino detector requires a huge amount of liquid argon, which must be transported down the tunnel. The present work focuses on the estimation of the most credible incident and the resulting consequences in the case of a truck accident in the tunnel. The approach and tools used in the present work are generic and can be adapted to other similar situations.     

市语的文化内涵及其现实意义——《江湖市语》序

本序文探讨了市语、行话、黑话这一类特殊的俗语的俗文化内涵,阐述了市语在唐、宋、元、明、清、民国至今各代传播流变的情况。重要的是,它是时下全国热议的非物质文化遗产俗语现象的一部分,研究它有现实的意义。