HIRFL前束线真空系统的改造与HIRFL-800低温泵的设计及热负荷的计算

本论文首先介绍真空技术涉及的物理基础和真空获得的有关知识，然后讲述，了H_RFL（兰州重离子加速器研究装置）真空系统的基本概况，在此基础上阐述了本论文主要的两部分：H_RFL前束线真空系统的改造；新型H_RFL佩800低温泵的设计一及热负荷的计算。其中H工RF［前束线真空系统的改造已经于2001年9月份完成并为兰州重离子加速器的正常运行提供了必要的真空条件。新型111佩又FL佩800低温泵正在加工生产中，并将用于大型超高真空系统H工R凡厂SSC（兰州重离子加速器研究装置主加速器）的抽空。H工RFL前束线真空系统的改造介绍了兰州重离子加速器前束线真空系统的基本结构，详细说明了H工RFL前束线真空系统改造前的流导、气体负荷及压力分布情况。提出了具体的改造措施。真空系统达到了预计要求：泵口压强小于5只10-6Pa，两泵之间束运管道中心平面压强小于1x10-5Pa.结果表明H工RFL前束线真空系统的改造方案是有效的。新型HIRFL一800低温泵的设计及热负荷的计算介绍了近代物理研究所自行研制的新型H工RFL一800低温泵。对其抽速，低温冷凝板和屏蔽板的热负荷进行了具体的分析和计算。肯定了新型H工RFL佩800低温泵的设计方案。

兰州重离子装置（HIRFL）中SSC径向微分探针驱动和控制系统的研制

本文叙述了反映束流品质有关物理量的测量方法；描述了HIRFL中SSC径向微分探针测量重要性及测量机制；分析了传动系统中各设备影响探针运行速度和测量速度的原因；设计了以8031为核心的单片机扩展系统作为步进电机控制器；实现了径向微分探针的闭环控制，提高了径向微分探针的运行速度和测量速度。消除了机械振荡

HIRFL主加速器SSC和注入器SFC等时场的建立

本论文计算HIRFL主加速器SSC和注入器SFC的理论等时场，并在实测线圈场数据基础上，用最优化方法计算出主线圈和垫补线圈电流，建立起垫补场。还进一步研究了垫补场下粒子的轨道特性。垫补场和理论等时场间的相对误差<=1#per thousand)

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．

High-efficiency and low-cost hybrid nanomaterial as enhancing electrocatalyst: Spongelike AWN core/shell nanomaterial with hollow cavity

A high-efficiency and low-cost spongelike Au/Pt core/shell electrocatalyst with hollow cavity has been facilely obtained via a simple two-step wet chemical process. Hollow gold nanospheres were first synthesized via a modified galvanic replacement reaction between Co nanoparticles in situ produced and HAUCl(4). The as-prepared gold hollow spheres were employed as seeds to further grow spongelike Pt shell. It is found that the surface of this hybrid nanomaterial owns many Pt nanospikes, which form a spongelike nanostructure. All experimental data including scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis-near-infrared spectroscopy have been employed to characterize the obtained Au/Pt hybrid nanomaterial. The rapid development of fuel cell has inspired us to investigate the electrocatalytic properties for dioxygen and methanol of this novel hybrid nanomaterial. Spongelike hybrid nanomaterial mentioned here exhibits much higher catalytic activity for dioxygen reduction and methanol oxidation than the common Pt electrode.

Study of alpha-, beta- and gamma-cyclodextrin/C-60 supramolecular complexes: Influence of the cavity dimension toward the host-guest complexes

Herein we report the spectroscopic, electrochemical, TEM and DLS characterizations Of C-60 supramolecular inclusion complexes with alpha-, beta- and gamma-cyclodextrins prepared using anionic C-60. The results indicate that the cyclodextrin itself has little effect on the encapsulated C-60 or on the properties of the inclusion complex. Instead, the cyclodextrin has a significant influence on the aggregation behavior of individual complex in aqueous solution, which in turn affects the property of the supramolecular complex of cyclodextrin and C-60 greatly, As the cavity dimension of cyclodextrin becomes smaller as it changes from gamma-CD to beta-CD, and finally to alpha-CD, it is observed that more aggregation occurs for the corresponding inclusion complex in aqueous solution.