低能碳离子束沉积（111）织构的立方SiC薄膜

在硅衬底上利用具有质量选择功能的低能离子束沉积技术沉积碳离子制备出除碳、硅之外无其他杂质元素的纯净的立方SiC薄膜．利用X射线光电子谱、俄歇电子能谱、X射线衍射对样品进行了表征．结果显示常温和400℃制备的样品为非晶结构，在800℃制备的样品由一富碳的表面层和有着良好化学计量比的SiC层组成，碳化硅晶体薄膜是（111）织构的．通过分析可知衬底温度、离子沉积能量和样品保温扩散时间等因素综合在一起对于在硅上沉积SiC薄膜起着重要作用．远远大于TRIM预测厚度的SiC薄膜的获得是高的衬底温度、一定注入能量的碳离子引起的增强扩散以及通道注入效应综合作用的结果。

Slow highly charged ions induced electron emission from clean Si surfaces

The electron emission yields from the interaction of slow highly charged ions (SHCI) He2+, O2+ and Ne2+ with clean Si surface are measured separately. It is found that electron emission yield gamma increases proportionally to projectile kinetic energy E-p/M-p, ranging from 0.75 keV/u to 10.5 keV/u (i.e. 3.8 x 10(5) m/s <= v(p) <= 1.42 x 10(6) m/s), and it is higher for heavy ions (O2+ and Ne2+) than for light ion (He2+). For O2+ and Ne2+, gamma increases with Z(p) decreasing in our energy range, and it shows quite different from the result for higher projectile kinetic energy. After calculating the stopping power by using TRIM 2006, it is found that the fraction of secondary electrons induced by recoil atoms increases significantly at lower projectile energy, thereby leads to the differences in gamma for heavy ions O2+ and Ne2+ between lower and higher projectile kinetic energy.

Magnetic Field Design of the Dipole for Super-FRS at FAIR

The Super-FRS (Super FRagment Separator) is a part of FAIR (Facility for Antiproton and Ion Research), which will be constructed at GSI, Germany by 17 countries. The Super-FRS comprises 24 superferric dipole magnets. The 2D and 3D magnetic field simulations of the prototype magnet are described in this paper. A passive trim slot and four chamfered removable poles are used to satisfy the required field homogeneity which is better than +/-3 x 10(-4) at 1.6 T, 0.8 T and 0.16 T in a wide elliptical useable aperture of 380 mm x 140 mm. Measurement results at various field levels are shown in this paper as well. It can be seen from the comparison of calculation and measurement results that the magnetic designs of the magnet fulfils the requirements.

3.02MeV离子辐射316L不锈钢引起的内部氦泡显微结构分析

本文以TEM为测量手段，研究了室温下3.02MeV的He离子辐照固溶处理和固溶冷轧处理的两种316L不狙钢中的内部氦泡空间排列及分布与深度的关系，辐照剂量分别为5.46 * 10~(17)He/cm~2和5.14 * 10~(17)He/cm~2。TEM试样是采用了一种特殊的横截面技术制成的。这种方法可以方便地从一个样品中获得整个投影射程上的全部信息。对TEM照片的测量得到了He泡直径数密度及体积肿胀随粒子λ射深度的分布。TEM研究表明：He主要以He泡形式存在于基体中。He泡直径分布在1到4nm间，He泡数密度高达10~(17)-10~(18)no./cm~3，He泡肿胀约为0.4%；He泡直径数密度及He泡肿胀随深度的变化而变化。也就是说，He泡直径数密度及He泡肿胀随剂量的增加而增大；TEM照片中观察到了He泡连通；固溶冷轧样中的He泡直径数密度及He泡肿胀比固溶处理样中的要小； He泡数密度及肿胀分布与用TRIM-86程序计算得到的注He浓度及位移损伤分布基本相一致。另外，用SEM观察辐照样品表面形貌时，表面未见有任何发泡产生

高温下碳离子在316L不锈钢中辐照损伤电子显微镜分析

用51.4 MeV的碳离子，在500 ℃的温度下辐照了两个316L不锈钢样品，峰剂量分别达到34dpa(3.15 * 10~(17) ions/cm~2)和124dpa(1.14 * 10~(18) ions/cm~2)。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）观察了离子入射面的形貌和横截面试样中的空洞肿胀。提出了用SEM观测空洞肿胀的新方法并在原理上论证了通过SEM观测来推测空洞肿胀及空洞大小分布的可行性。得出了空洞面积肿胀在数值上等于体积肿胀的结论，并推导了由SEM观测的空洞切口大小分布计算空洞大小分布的公式。通过横截面试样的扫描电镜照片，测量了横截面空洞切口直径和面积肿胀随离子注入深度的变化关系；通过横截面试样的透射电镜照片，测量了样品内部的空洞大小分布。用TRIM计算机程序计算了位移损伤分布，并将它与空洞面积肿胀在深度方向上的分布进行了比较

HIRFL SSC等时场的计算，垫补和优化

本论文通过对kb,kr,方法的讨论，纠正了以前的等时场计算方法中存在的1‰的误差．理论和实际情况符合得很好．编制了HIRFL SSC SFC等时场优化程序，以及SSC二维场构造程序，在计算机上进行了SSC模拟优化．优化结果表明，上述程序在理论上可以自洽．

Protein A immobilized monolithic capillary column for affinity chromatography

Monolithic capillary columns for affinity chromatography were prepared by an in situ polymerization procedure using glycidyl methacrylate (GMA) as a monomer and trimethylolpropane trimethacrylate (TRIM) and ethylene dimethacrylate (EDMA) as cross-linkers, respectively. Scanning electron microscopy was applied to characterize the morphology of the end of monolithic capillary and mercury intrusion porosimetry to characterize the polymer rod prepared within the confines of a stainless steel column with 50 mm x 4.6 mm i.d. under the same polymerization condition. Obvious differences in the porous properties between the TRIM- and EDMA-based monoliths could be observed. Moreover, the mechanical stability of these two monolithic capillary columns was compared by testing the reproducibility of the column performance. The rod prepared with GMA and TRIM proved to be mechanically more stable than that prepared with GMA and EDMA. Protein A was immobilized on the monolithic rod for affinity chromatography and the experiments were performed on a capillary electrophoresis instrument, using its pressure system as the driving force. Non-specific adsorption was not observed on the TRIM-based affinity column, as proved with bovine serum albumin (BSA) as a test protein. The affinity column prepared with GMA and TRIM was then applied to determine the hIgG concentration in human serum. The correlative coefficient of the calibration curve reached 0.9942. The amount of adsorbed hIgG was unaffected by the flow rate of the loading buffer, which makes this method suitable for fast determination of biomacromolecules in microliter samples. (C) 2002 Elsevier Science B.V All rights reserved.