High-Yield Synthesis of Endohedral Metallofullerenes Y@C_(2n) and Y_2@C_(2n)

Becauseoftheirunusualstructureandmanyexpectednoveloptic,electricandmagneticproperties.endohedralmetallofullerenes(EMFs)haveintenselyattractedtheinterestofbothchemistsandmaterialscientists.TheoriginalyttriunlEMFsweresynthesizedbylaserablation:andarcburningmethod=.UPtonow,onlyY@C,=wasisolatedandpurifiedby'HPLC;inmilligramqLlantitiesandsolllespectroscopicandstructuralanalysesincludingXPSIEXAFS'.STMS.ESR",XRD:andRamalltecllniqtle'havebeenusedtocharacterizeit.However,furtherillvestiga…     

Study on the Inclusion Complex of Major Component of Rhubarb with Cyclodextrins

The inclusion complexes of major component of rhubarb using cyclodextrins as host molecules have been studied by phase solubility method. Rhubarb (rheum officinale Baill.),a common Chinese traditional medicine, has antibacterial, diminish inflammation and resist decrepitude effect etc,its further use is limited due to its low solubility.     

Interrelation Research on Three Kinds of Trace Element Copper,Zinc and Manganese in Cereal of the Different Incidence Areas of the Esophagus Cancer

With the development of modern biology and medical science,we have had enough evidence to prove some kinds of trace element(TE) have vital effect on the human body's physiology function, metabolism,heredity and so on. And the effect can directly relate to people's daily food. This paper determined copper, zinc, and manganese levels in cereal of the different incidence areas of the Esophagus cancer by atomic absorption spectrophotometry. In order to probe into the interrelation between TE and the esophagus cancer, the analytical results had been statistically done and listed in Table.     

基于显式几何更新算法的地下管道自动形状优化

基于计算力学中的结构优化思想,应用一种新型的显式几何更新算法,自行编制C++程序,实现地下管道形状设计的自动优化。管道内的流体假设为牛顿不可压缩流,并考虑惯性项。优化区域主要为管道竖直方向和水平方向的过渡段。形状优化的设计变量是几何边界的有限元节点坐标,优化目标是实现流体黏性能耗散的最小化。优化过程基于形状梯度,即通过形状敏感度分析来求解目标函数相对于设计变量的偏导数。所使用的显式几何更新算法既可以通过网格清晰描述形状,也可以大范围地自动更新网格。详细介绍了地下管道自动形状优化过程的关键步骤。通过数值算例探讨了不同注入速度、密度和黏度对其最优形状的影响。     

HL-2M偏滤器CFC/CuCrZr靶板的非晶钎焊工艺研究

在采用商用的STEMET-1101非晶钎料、温度为710~750°C的真空钎焊下,对CFC/OFC(氯氟烃/无氧铜)复合块与CuCrZr(铬锆铜)的钎焊进行了研究。首先,通过X-射线衍射(XRD)和差式扫描量热分析对钎料的结构和熔化行为进行了表征;然后,通过光学显微镜、电子探针微分析和拉伸试验等方法对焊缝的组织形貌、元素成分分布、相结构和力学性能进行了分析;最后,通过高热负荷装置对CFC/OFC/CuCrZr钎焊模块的热疲劳性能进行测试。结果表明,在710~750°C钎焊温度内焊缝由Cu固溶体、(Cu, Ni)3P和Ni(Cu ,Cr)2P金属间化合物组成,焊缝平整无裂纹;特别是在750°C/15min情况下,抑制了焊缝金属间化合物的连续分布,OFC/CuCrZr的焊接强度大于OFC的抗拉强度,CuCrZr/CuCrZr的结合强度为210MPa,并呈现部分韧性断裂。在750°C/15min情况下制备的CFC/Cu/CuCrZr模块可以承受1000次7MW·m^-2的循环热负荷。     

多喷嘴氦冷偏滤器的优化与分析

利用ANSYS/CFX对聚变堆氦冷多喷嘴冷却偏滤器模块在相同高热负荷条件但不同冷却条件下进行了有限元数值分析,得到了偏滤器冷却单元的温度和换热系数分布图,将该温度场作为结构力学分析的加载条件,利用ANSYS/Mechanical对冷却模块进行了稳态条件下的结构应力分析,得到了具有不同结构参数的偏滤器模块的应力分布。通过分析各结构参数对偏滤器模型的热应力的影响,对结构参数进行筛选,得到内应力相对较低的结构设计,从而优化多喷嘴氦冷偏滤器结构。     

用长气体靶研究22Na+α共振散射

在日本东京大学CRIB 次级束装置上,用长气体靶开展了22Na+ α共振散射的厚靶实验研究。针对长气体靶实验中的两体运动学重构问题,提出了一套包括构建空间复杂几何关系、计算能量损失以及反应运动学的逐事件分析方法;对22Na+α共振散射的实验数据进行了重构分析,得到了E_c.m. = 4.2 ~ 5.4 MeV 区间22Na( α,α ) 的激发函数,从实验的激发函数中观测到了复合核26Al 5 个较为明显的共振峰。鉴于26Al 共振态的衰变模式比较复杂,本工作发现的26Al新共振态的能级性质有待进一步的理论分析。The 22Na+α resonant scattering is studied via a conventional thick target inverse kinematic method with an extended gas target. A data analysis method is proposed for the two-body reaction kinematic reconstruction, in which the spatial geometry, the reaction kinematics and the energy losses are considered. The experimental data of 22Na+ αresonant scattering have been thus reconstructed, and the excitation function is obtained in the energy interval of Ec.m. =4.2~5.4 MeV. Five resonant states in 26Al are observed in the experimental excitation function. Since several decay modes coexist for the observed 26Al resonant states, multi-channel theoretical analysis is thus needed to reveal their structure and decay features.     

液晶器件相位调制特性研究

利用2×2琼斯矩阵方法,理论上分析了不同液晶排列的透射型与反射型液晶器件的相位调制特性.在光强透过率变化小于10%的条件下,得出了两种类型器件的纯相位调制范围.     

Fantastic Behaviour of High-TC Superconductor Junctions: Tunable Superconductivity

Carrier injection performed in oxygen-deficient YBa2 Cu307_~ （YBCO） hetero-structure junctions exhibits tunable resistance that is entirely different from the behaviour of semiconductor devices. Tunable superconductivity in YBCO junctions, increasing over 20 K in transition temperature, has achieved by using electric processes. To our knowledge, this is the first observation that intrinsic property of high Tc superconductors＇ superconductivity can be adjusted as tunable functional parameters of devices. The fantastic phenomenon caused by carrier injection is discussed based on a proposed charge carrier seff-trapping model and BCS theorv.     

量子化学计算预测高效液相色谱键合相的保留机理

本文用Gaussian98计算软件中的Hartree—Fock方法对高效液相色谱中溶质与固定相发生作用后产生的能量进行计算,并对溶质与C18键合相和苯胺甲基键合相相互作用的计算结果与实验结论进行了比较。结果表明,量化计算结果与色谱保留行为之间具有相关性,即分子间相互作用能量的高低,决定了保留值的大小,表现为能量越负,保留值越大,而且双倍键合量的能量低于单倍键合量。量化计算的方法将为色谱保留性能的研究和键合相的研制提供参考。