Multi-physics analysis of the RFQ for Injector Scheme II of C-ADS driver linac

A 162.5 MHz, 2.1 MeV radio frequency quadruples （RFQ） structure is being designed for the Injector Scheme Ⅱ of the China Accelerator Driven Sub-critical System （C-ADS） linac. The RFQ will operate in continuous wave （CW） mode as required. For the CW normal conducting machine, the heat management will be one of the most important issues, since the temperature fluctuation may cause cavity deformation and lead to the resonant frequency shift. Therefore a detailed multi-physics analysis is necessary to ensure that the cavity can stably work at the required power level. The multi-physics analysis process includes RF electromagnetic analysis, thermal analysis, mechanical analysis, and this process will be iterated for several cycles until a satisfactory solution can be found. As one of the widely accepted measures, the cooling water system is used for frequency fine tunning, so the tunning capability of the cooling water system is also studied under different conditions. The results indicate that with the cooling water system, both the temperature rise and the frequency shift can be controlled at an acceptable level.     

五环[5.4.0.02,6.03,10.05,9]十一烷-内-8-醇的合成新方法

五环[5.4.0.02,6.03,10.05,9]十一烷-内-8-醇是合成抗流感病毒医药、抗发炎药物、高能量燃料和燃料添加剂的关键中间体,本研究以环戊二烯和对苯醌为起始原料,经过Diels-Alder、光环化、羰基保护、氢化铝锂还原、水解、黄鸣龙还原等6步反应合成五环[5.4.0.02,6.03,10.05,9]十一烷-内-8-醇,总产率达44.9%.本方法操作简便,分离纯化容易,成本低廉,收率高,为五环[5.4.0.02,6.03,10.05,9]十一烷-内-8-醇的规模化合成奠定了基础.     

Synthesis of the p-keto acids from benzimidazolium iodides and ethyl malonate

The reaction of benzhnidazole methiodide with ethyl malonate in the existence of base was studied,and a new convenient synthetic method of the β-keto acid was provided.     

由硬币自转几周引发的思考

一、实验明辨是非题目有两个大小相同的硬币,其中一个硬币固定不动,另一个硬币在其外侧相切滚动一周,且不发生滑动,则这个滚动的硬币自转几周? (江西省2003年中考样卷试题) 很多同学首次解答这道题时,都认为这个     

一类正值线性过程的参数估计

在研究水质污染问题时,文[1]提出了非负一阶自回归模型:X_t=(?)X_(t-1)+ξ_t,其中{ξ_t}为独立同分布非负随机序列,0<(?)<1.此模型中 X_t 表示在时刻 t 时净化池中的污水量,1-(?)_1表示在单位时间间隔内被净化污水的比例,ξ_t 表示在时刻 t 注入净化池中的污水量.文[1]给出了模型参数的极为简便的强相合估计和相应的模拟结果.文[2]把[1]的结果推广到二阶自回归情形,克服了本质上的困难获得相应的结果.本文提出一类更为广泛的正值线性模型     

一种化学反应快速跟踪实验技术——GC-Ampoule联用技术

一种化学反应快速跟踪实验技术——ＧＣ┐Ａｍｐｏｕｌｅ联用技术蒋毅程极源何展荣（中国科学院成都有机化学研究所６１００４１）在非稳态反应，快速反应和个别自催化反应研究中，要求人们能及时了解体系组成和产物分布的迅速变化，跟踪反应对于认识反应机理也是至关重要...     

Structure and Wettability Engineering of Polycrystalline Diamond Films Treated by Thermally Oxidation,Second Growth and Surface Termination

High-quality polycrystalline diamond films with dominated(100)-oriented grains are realized by combining the thermally oxidation and the homogeneous second growth processes. Moreover, we investigate the wettability property of the polycrystalline diamonds in various stages. Different surface structures(with various grain sizes,voids, and orientations, etc.) and terminations(hydrogen or oxygen) have significant effects on the wettability of polycrystalline diamond films. The wettability is furthe...     

织物表面摩擦特性测试装置及试验研究

为了评价织物表面的摩擦特性,表征织物和皮肤接触过程中摩擦力的动态变化信息,研制了一种能测试织物表面动态摩擦特性的机械测试装置,该装置集成了机械装置、传感器及控制系统,能一次性测试织物的静、动摩擦系数.基于测试过程中采集的原始数据,定义了摩擦功、静摩擦系数及动摩擦系数3个指标来评价织物表面的摩擦特性.试验采用12种典型的织物样本,对织物的表面摩擦特性进行了客观测试及主观评价,并在日本Kawabata KES-FB4系统上进行了对比试验.结果表明:针对12种典型的织物样本,3个评价指标均存在着显著的差异,牛仔布具有最大的静摩擦系数,经编网眼针织布具有最小的静摩擦系数,与常理相符.客观测试得到的动态指标摩擦功和主观评价的结果具有一致性.本测试装置得到的动态摩擦系数和KES-FB4测试得到的平均摩擦系数也具有一致性.该测试装置可以为相关领域的研究提供一种新的测试手段.