Vacuum System for HL-2A Tokamak

The vacuum system for HL-2A was built in 2003. The test results indicated that this system is feasible. It consists of three main parts: a pumping system, a pumping divertor and a glow discharge cleaning (GDC) system. For the pumping system, there are three main functions: (1) evacuating the vacuum vessel thus to produce an ultra high vacuum, (2) removal of impurities released during baking and (3) pumping during GDC. The pumping divertor controls the particles at the plasma edge and the GDC system provides a clean wall conditioning. During the first campaign of physical trial experiment on HL-2A, the ultimate pressure reached 4.6 × 10-6 Pa, and the total leakage and outgassing rate in 12 hours was 1.8 × 10-5 Pa·m3/s, which is close to that of ASDEX.     

大学生诚信度问题调查----浅议当代大学生诚信缺失的原因与措施

诚信是中华民族的传统美德,是全人类所认同的道德规范。诚信,对于提升整个社会的道德水平,促进经济的发展、社会的稳定等方面具有重大的意义。当代大学生是国家的未来建设者和接班人,他们的诚信状况将直接关系到我国社会主义现代化建设的顺利进行。当今大学生的诚信问题是一个非常重要的议题     

HL-2A托卡马克真空烘烤除气性能研究

120℃过热水循环系统对HL-2A主机真空室进行烘烤除气,温升梯度为±1.5℃,持续时间302 h。烘烤过程包含两个恒温阶段,90℃热平衡后真空度达到4.8×10-4Pa,120℃热平衡后真空度达到2.3×10-4Pa。真空室经过烘烤除气后真空度为2.2×10-5Pa。结合实验数据,通过拟合函数建立数学模型对真空度变化规律进行趋势分析,验证了过热水烘烤除气在HL-2A装置真空系统运行中的合理性和重要性,为300℃以上高温烘烤除气方案的制定提供依据。     

基于无线传感器网络的林火监测预警系统

无线传感器网络是科学领域的一个新方向。针对森林火灾发生的严峻形势,提出一种应用无线传感器网络的森林火灾实时监测预警系统,给出系统的框架、关键技术和实施方案,实时监测林区的空气温度、湿度及有林火产生时的烟雾稠密浓度等相关坏境参数,通过林火天气指标系统进行预警,为森林防火、灭火提供重要依据。