Quasielastic Scattering of the Halo Nucleus ^6He at 25 MeV／u from a ^9Be Target

The differential cross sections of quasielastic scattering of a 25 MeV/u ^6He from ^9Be target have been measured.The double-folding model approach is applied to generate the real part of the optical potential. The imaginary potential parameters as well as some of the real potential parameters are studied in comparison with the experimental data. The effect of the unstable nucleus is discussed.     

二元液态金属Cu-Ni和Ag-Cu凝固过程的分子动力学模拟研究

用Quantum Sutton-Chen多体势对Ag6Cu4和CuNi液态金属凝固过程进行了分子动力学模拟研究.在冷却速率2×1012到2×1014K/s范围内,CuNi总是形成fcc晶体结构,而Ag6Cu4总是形成非晶态结构.考虑到CuNi及AgCu中原子半径之比分别为1.025和1.13,那么模拟结果证实了原子的尺寸差别是非晶态合金形成的一个主要影响因素.此外采用键对及原子多面体类型指数法对凝固过程中微观结构组态变化的分析,不但能说明二十面体结构在非晶态合金形成和稳定性中所起的关键作用,又有助于对液态金属的凝固过程、非晶态结构特征的深入理解.     

对朝鲜弹道导弹能力的初步分析

根据收集到的公开数据，从弹道导弹的种类和数量，导弹的射程，精度，可靠性，再入体设计能力等方面，对朝鲜的弹道导弹能力进行初步分析，在此基础上计算分析了日本导弹防御系统对朝鲜导弹的防御能力。     

HLS直线加速器调制器系统设计与改造

介绍了合肥同步辐射光源速调管调制器改造项目.在新的设计中采用了开关型恒流PFN充电电源,计算了充电参数,建立了主放电回路的仿真模型,重点分析了电路中反向电压问题,依据仿真结果及分析设计了反向保护电路.给出了运行中的主要波形.最后介绍了新的调制器控制系统.     

原子物理学的学术战略地位与素质教育中的作用

探讨了原子物理学在现代科学技术中的学术战略地位以及素质教育中的重要作用，指出了在科教兴国、大力发展高科技的今天，原子物理学的教学只能加强、不能削弱。     

环境对MgB_2氧化过程中MgO晶须生长形状的影响

用扫描电镜研究了在 Mg B2 氧化过程中环境对 Mg O晶须生长形状的影响。仅有 Mg B2 时 ,在 80 0℃左右空气气氛中 ,可生长出纳米尺寸的 Mg O晶须。若把 Mg B2 添加到氧化铝陶瓷基体中 ,则生长成竹节状晶须。Mg O晶须生长形状的差别可能是由于氧浓度以及位错等因素造成的。     

A novel video object tracking approach using bidirectional projection

This paper proposes a novel video object tracking approach using birdirectional projection. Forward projection is exploited to locate the current video object with rough boundary information. Watershed segmentation is applied to the simplified gradient image of the current frame to obtain a reasonable partition. An improved backward projection, which incorporates pixel classification with region classification, is performed on some segmented regions in a rather small search range, and the tracking performance is enhanced in respect to both reliability and efficiency. Experimental results for various types of the MPEG-4 (moving picture experts group) test sequences demonstrate an efficient and faithful segmentation performance of the proposed approach.     

光纤任意反射面速度干涉系统的应用

“任意反射面的速度干涉仪”VISAR（Velocity Interferometer System for Any Reflector）技术，已成为诊断冲击作用下样品自由面速度剖面或粒子速度剖面的主要技术。其主要优点在于能够对高速度、高加速度运动事件进行非接触的连续测试。     

A New High Efficiency Multiwave Cerenkov Generator Operating at Low Magnetic Field

With a resonant cavity inserted between the second slow-wave-structure section and the tapered wavegulde, a new structure of the multlwave Cerenkov generator (MWCG) operating at low guiding magnetic field is proposed to produce high efficiency and high power microwave. Some features and potential advantages of the proposed device are analysed. The 2.5-dimensional partlcle-in-cell simulation is employed to verify the initial expectation.The results show that, with the use of an electron beam of 640keV and 8.4kA guided by the magnetic lield of 0.6 T, a stable and monochromatic X-band microwave output of 4 GW in peak power is achieved, and the average efficiency is over 30%.     

碱蓝6B共振光散射法检测DNA

研究了碱蓝 6B与脱氧核糖核酸在酸性条件下共振光散射特征 ,考察了影响因素和最佳反应条件 ,建立了一种测定纳克级DNA的方法。在四硼酸钠 盐酸 (pH =2 90 )缓冲溶液中 ,线性范围为 10～ 10 0 4 μg·L- 1 ,相关系数为 0 9913,检出限为 4 2 μg·L- 1 ,用于合成样品的测定结果令人满意。