Tune optimization of the third generation light source storage ring based on Frequency Map Analysis

Tune optimization is necessary to optimize the nonlinearity of the third generation light source storage ring. In this paper we summarize the common strategies for choosing a tune and discuss tune op- timization. Frequency Map Analysis （FMA） is applied as a tune scanning tool to reveal information about nonlinear resonances and guide the tune optimization. The Shanghai Synchrotron Radiation Facility （SSRF） storage ring is taken as a test lattice, and the optimum solutions are presented in this paper. Moreover, the third order regular structural resonances excited by sextupoles are particularly investigated, and it is found that these resonances distort the tune shifts with amplitude and show a stop-band like the linear structural resonances.     

Linear optics calibration and nonlinear optimization during the commissioning of the SSRF storage ring

Phase I commissioning of the SSRF storage ring on 3.0 GeV beam energy was started at the end of December 2007. A lot of encouraging results have been obtained so far. In this paper, calibrations of the linear optics during the commissioning are discussed, and some measured results about the nonlinearity given. Calibration procedure emphasizes correcting quadrupole magnetic coefficients with the Linear Optics from Closed Orbit (LOCO) technique. After fitting the closed orbit response matrix, the linear optics of the four test modes is substantially corrected, and the measured physical parameters agree well with the designed ones.     

玻璃真空管内插热管式集热器非稳态效率分析

本文针对玻璃真空管内插热管式太阳能集热器的结构特点,非稳态效率进行了研究.通过能量平衡分析和实验对比,对两种集热器的非稳态效率进行了分析研究,得出较为理想的非稳态效率方程.理论分析与实验结果表明:玻璃真空管内插热管式集热器与全玻璃真空管式集热器相比,热容小、启动快、防冻抗冻能力强,能承压、稳定、安全运行,具有较好的高温效率特性和保温特性,非稳态效率高出15%左右,为其在太阳能膜蒸馏系统上的应用研究奠定了基础.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility (SSRF)booster ring, a full energy injector for the storage ring, is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping. Closed orbit distortion (COD) caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting. Considering the affections of random errors in measurement, both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5 is given as the final installation sequence of the booster bending magnets in this paper.     

Excitation curve calibration for the SSRF magnet system

The needed electrical current for the magnet working under different energy loads can be easily calculated once the right relation between the magnet and the electrical current has been found. Therefore the excitation curve calibration for the magnet system is important to the SSRF. The measuring method on the magnet and the result of the excitation curve calibration are presented. The application of the excitation curve calibration for the bending magnet is given, and it is proved that the COD （Closed Orbit Distortion） and the working point of the storage ring are greatly affected by the current of the bending magnet.     

机电系统的统一对称性

研究机电系统的统一对称性. 由系统的Lagrange-Maxwell方程, 给出系统的统一对称性的定义和判据, 得到了系统的统一对称性导出Noether守恒量，Hojman守恒量和Mei守恒量. 举例说明结果的应用. 关键词： 机电系统 统一对称性 守恒量     

一种基于规则的情境感知系统设计与实现

情境感知系统能够感知用户所处的情境,以及情境的变化,并根据情境信息去提供用户需要的服务.针对情境信息复杂性和实效性双重特点,本文基于面向对象的情境建模方法,在情境信息分类的基础上,提出了一个LUTERS情境对象模型.在情景信息模型化的基础上,本文阐述了情境推理规则的定义,提出了基于规则引擎的情境推理框架,有效的提升了情景感知系统的灵活性.     

资质过剩感知与员工时间侵占行为的关系研究:自我决定感和威权领导的作用

本文以资源保存理论和自我决定理论为切入点,探讨了资质过剩感知与员工时间侵占行为的关系及自我决定感和威权领导在两者之间的作用机制。以402名企事业员工为对象的调查研究显示:资质过剩感知正向影响员工时间侵占行为;自我决定感在资质过剩感知与员工时间侵占行为之间起到了部分中介作用;威权领导调节了资质过剩感知与自我决定感之间的关系,同时调节了资质过剩感知通过自我决定感的降低影响员工时间侵占行为的间接效应。     

银的催化分光光度测定

本文研究了用银离子催化过硫酸盐氧化亚铈盐以测定银的催化分光光度测定法.当测定波长为410毫微米时,银量由4～60微克/毫升与 D-t 直线的斜率成直线关系;若测定波长为330毫微米,斜率与银量的直线关系范围为0. 2～24微克/毫升.测定的最低浓度为0. 2微克/毫升.测定的适宜条件为:取0. 025M 硫酸亚铈盐5毫升,2N 硫酸1～7毫升和不同量银离子,以及0. 05M 过硫酸盐10. 00毫升稀释成25. 00毫升.并研究了温度及一些杂质离子对测定的影响.应用银离子催化某些反应速度以测定银的分析方法已有一些报导,银离子催化过硫酸盐氧化三价铈的反应:2Ce~3+S_2O_8~(2-)(?)2Ce~4+2SO_4~(2-)虽已证明反应速度与三价铈离子的浓度无关,与过硫酸盐浓度及银离子浓度成正比,但这反应还未见被利用.我们采用催化光度斜率法应用上述反应进行了银的测定试验,银离子最低浓度可达0. 2微克/毫升,且许多杂质离子的存在对测定影响不大.     

Unified symmetry of non-holonomic singular systems

In this paper, the unified symmetry of non-holonomic singular systems is studied. The differential equations of motion of the systems are given. The definition and the criterion of the unified symmetry for the systems are presented. The Noether conserved quantity, the Hojman conserved quantity and the Mei conserved quantity are obtained. An example is given to illustrate the application of the results.