激光干涉法测量弹性模量

从光的干涉原理出发，讨论了金属丝弹性模量的光电测量方法．设计了激光干涉法测量长度微变量的测量装置，并介绍了测量原理，给出了动镜移动方向判别电路．     

Quantitative Single-Ion Irradiation by ASIPP Microbeam

A single-ion microbeam facility has been constructed by the microbeam research group in ASIPP (Institute of Plasma Physics, Chinese Academy of Science). The system was designed to deliver defined numbers of hydrogen ions produced by a van de Graaff accelerator, covering an energy range from 200 keV to 3 MeV, into living cells (5μm-20μm diameter) growing in culture on thin plastic films. The beam is collimated by a 1-μm inner diameter HPLC (high performance liquid chromatograph) capillary, which forms the micron-dimensional beam-line exit. A microbeam collimator, a scintillation ion counting system and a fast beam shutter, which constitute a precise dosage measuring and controlling system, jointly perform quantitative single-ion irradiation. With this facility, we can presently acquire ion-hitting efficiency close to 95%.     

单粒子束装置中束线开关的研究

介绍了国内第一台单粒子束装置中束线开关的控制原理，通过实验验证了束线开关的反应时间在5μs以内，满足实际工作需要。     

单粒子束细胞定位照射装置中微图像处理系统的设计

为了适应细胞辐射生物学基础研究的需要 ,按照生物实验的要求和装置的物理指标设计了实验室单粒子束装置的微图像处理系统。设计中遵循了科学性和经济性的原则 ,结构紧凑 ,性能稳定。结果表明 ,该系统达到了预期指标 ,解决了单粒子束装置精确定位辐射的这一关键技术 ,为细胞核的辐射实验提供了有力的工具     

Accuracy Measurements of the CAS-LIBB Single-Particle Microbeam for Single Cell Irradiation

A single-particle microbeam facility has been constructed at the Laboratory of Ion Beam Bioengineering (LIBB),Chinese Academy of Sciences. The system is designed to deliver the defined number of hydrogen ions, covering a range of energy from 1.0 to 3.5 MeV, into an area smaller than the nuclei of individual living cells. Accuracy of the particle detection system and the cell targeting system in the facility has been assessed using CR39 (nuclear track detector) for 2.3 MeV protons. The results demonstrate that the particle detection efficiency is above 98%,and the overall targeting accuracy of the microbeam is limited within 3μm for more than 90% hits.     

WENO格式物理/计算域变换精度对流动预测的影响

精细地捕捉激波及分离流对航空叶型/翼型设计具有重要意义。WENO(Weighted Essentially Non-Oscillatory)格式以其高间断分辨率和低耗散的特性得到广泛青睐。格式的构造都是基于均匀网格,而在实际应用中考虑计算量的问题,通常需要在梯度较大的地方进行局部加密,生成非均匀网格。坐标变换法是一种有效地将格式运用于非均匀网格的方法,而坐标变换的精度对格式特性的影响尚未得知,存在一定的盲目性。针对该问题,基于非均匀网格,开展不同精度坐标变换方法对有限差分WENO格式的精度、耗散影响研究;同时结合工程实际问题,研究不同精度非均匀网格处理方法对激波分辨率和大尺度涡捕捉能力的影响,并给出工程应用建议。