Thermal analysis of the CSNS H－ ion source

There are two cooling systems to maintain the thermal stability of the CSNS H^- ion source during its operation： Air-cooling in the source body of the discharging chamber and water-cooling in the flange on which the discharging chamber is installed. The optimal cooling parameters to ensure the operation of the H^- ion source are determined through a thermal analysis. In addition, a transient analysis is also performed to know exactly the transient temperature variation during the whole 40 ms period of the pulsed mode operation of the ion source.     

大孔树脂对中分子物质的吸附研究 Ⅱ.对尿毒症患者血浆中分子物质的吸附性能

前文~1已从14种树脂中筛选出对中分子物质具有较好吸附性能的X_3大孔吸附树脂。本文则在此基础上,详细研究了X_3树脂对尿毒症患者血浆中分子物质的吸附性能及其血液相容性。     

Study on the pre-chopper in CSNS LEBT

Physical designing of the pre-chopper in CSNS LEBT is carried out, which includes the deflecting voltage, the length and the width of the deflecting plates, and the gap between the deflecting plates. The most outstanding feature of the design is that both the gap and the width vary with the beam envelope size. So both the requried deflecting voltage and the loaded capacitance are lowered. In order to avoid destruction of the space charge neutralization by the pre-chopper in the whole LEBT, an electron-trapping electrode is arranged to confine the electrostatic field of the pre-chopper to the local area. To examine the reliability of the pre-chopping design in CSNS LEBT, a similar pre-chopping design in ADS RFQ LEBT is set up and an experiment on the pre-chopper is prepared. 3-dimensional simulations are carried out to determine the loaded capacitance and the applied voltage of the electron-trapping electrode.     

Design of a multi-cusp ion source for proton therapy

The permanent magnets of the discharge chamber in a multi-cusp proton source are studied and designed. The three electrode extraction system is adopted and simulated. A method to extract different amounts of current while keeping the beam emittance unchanged is proposed.     

Thermal analysis of the CSNS H~- ion source

There are two cooling systems to maintain the thermal stability of the CSNS H- ion source during its operation:Air-cooling in the source body of the discharging chamber and water-cooling in the flange on which the discharging chamber is installed.The optimal cooling parameters to ensure the operation of the H- ion source are determined through a thermal analysis.In addition,a transient analysis is also performed to know exactly the transient temperature variation during the whole 40 ms period of the pulsed ...     

PP/EPDM共混物热氧稳定性研究

通过热氧加速老化的方法研究了不同的EPDM含量和抗氧剂对聚丙烯和三元乙丙橡胶共混物(PP/EPDM)热氧稳定性的影响.通过对老化前后试样的力学性能变化分析,热失重(TG)分析和扫描电镜(SEM)分析,结果表明:在热氧加速老化的初期,PP/EPDM共混物的拉伸强度随着时间的增长呈逐渐上升的趋势;在老化中期,共混物的拉伸强度变化不大;在老化后期,共混物的拉伸强度逐渐下降.在整个老化过程中,断裂伸长率都呈逐渐下降的趋势.而随着EPDM含量的增加,相应共混物的拉伸强度和断裂伸长率的下降减缓;相应共混物的分解温度得到较大的提高;抗氧剂的加入,能进一步提高共混物的热氧稳定性.     

以旧换新 推陈出新

实验室器材更新换代, 如何使濒于淘汰的老旧破损器材发挥余热, 通过老式的水轮机与微风扇的组 合, 达到以旧换新, 推陈出新的效果. 在开发课程资源的同时, 提升教师专业素养与学生创新能力     

自制教具系列化 — — — 以食盐水为核心的教具及实验开发

自制教具在物理教学过程中具有重要的作用, 但自制教具也存在着一些困难. 通过以食盐水为例, 阐 述以某一核心资源进行自制教具系列化和实验开发的一些参考路径     

以知识体系为核心的自制教具 系列化及实验开发

针对当前自制教具存在的一些缺点, 以苏科版八年级上册“ 光的折射”为案例, 提出改进方案及“ 自制 教具系列化”的观点, 并从知识体系视角展开讨论     

大孔吸附树脂对尿毒症和烧伤毒血症血浆中分子物质体外吸附的研究

研究了大孔吸附树脂对尿毒症和烧伤毒血症患者血浆中分子物质的体外吸附,用Sephadex G15柱层析法对血浆中分子物质进行吸附前、后的组分分析,并进行了血浆模拟灌流实验,观察中分子物质的清除率,初步探讨了大孔吸附树脂孔结构对中分子物质的吸附机理。