基于近似解析法的超导储能磁体设计

降低超导储能磁体的研制成本一直是控制超导磁储能系统(Superconducting Magnetic Energy Storage, SMES) 总成本的重要手段之一. 本文考虑在一定磁体结构参数范围内, 磁体产生的最大磁场值可以采用级数进行 表示, 磁体的电感值可以采用线性函数表示, 给出了超导储能磁体磁场能量的近似解析表达式, 提出了一种基于近 似解析法的超导储能磁体设计方法. 该方法以储能磁体的线材用量最小作为设计目标, 在给定超导线材参数和临界电流特性曲线, 以及磁体储能总量要求的情况下, 依据此方法可快速的得到成本最优时所对应的磁体结构参数.将近似解析法优化和采用传统的有限元软件 Ansys 仿真优化进行对比分析, 结果表明采用近似解析法进行磁体优化更加方便快捷, 节省了大量计算时间.     

高效液相色谱-荧光检测器法测定2-噁唑烷酮的含量

建立一种利用高效液相色谱结合荧光检测器准确测定2-噁唑烷酮含量的方法。样品中的2-噁唑烷酮和占吨氢醇在60℃的条件下衍生70 min后,直接进样分析。采用月旭XB-C18色谱柱,流动相为0.02 mol/L乙酸钠水溶液和乙腈,检测器波长为λex=213 nm,λem=308 nm,流速1.0 mL/min,柱温35℃的条件下。2-噁唑烷酮浓度在0.5~50.0mg/mL时,线性关系良好(R2=0.9995),检测限和定量限分别为0.005 mg/L、0.016 mg/L。该方法准确、灵敏、快速,适用于2-噁唑烷酮含量的检测。     

System-size effect on the friction at liquid-solid interfaces

The friction at the liquid-solid interfaces is widely involved in various phenomena ranging from nanometer to micrometer scales. By the molecular dynamic(MD)simulation, the friction properties of liquid-solid interfaces at the molecular level are calculated via the Green-Kubo relation. It is found that the system size will influence the value of the friction coefficient, especially for the solid surfaces with the larger polar charge. The value of the friction coefficient decreases with the increase in the system size and converges at large system sizes. The large polar charge will lead to a significant friction coefficient. However, the diffusion of water molecules on this surface is almost a constant, indicating that the diffusion coefficient seems to be independent of the system size and polar charge. This work provides insights for the selection of the system size in modeling the frictional properties of hydrophobic/hydrophilic surfaces.     

地磁对γγ方向角关联测量的影响

在γ-γ角关联实验中,发现能谱中全能峰的位置随探头方位角的改变而变化。本文通过不同的实验,验证了地磁对能谱测量的干扰以及对γ-γ方向角关联测量的影响。发现地磁对测量的影响主要来自光电倍增管,地磁方向与光电倍增管中电子飞行方向的夹角的改变,引起光电倍增管增益变化,最终给γ-γ方向角关联测量带来较大的影响。文中总结了如何减小地磁影响,改进γ-γ方向角关联实验测量的方法。     

新型联苯四氮唑沙坦类化合物的合成

以3-甲基-4-硝基苯甲酸为原料,经酯化、还原、硝化等10步反应合成了4个新型的联苯四氮唑沙坦类化合物,其结构经1H NMR,13C NMR和MS表征。     

基于DIS数字信息化系统对透光物质透光性能的研究

采用DIS数字信息化系统,对不同浓度的蓝墨水溶液在激光光源照射下的透射平均照度及照度分布图像进行实验研究,得到了平均照度值随溶液浓度变化的规律。对不同颜色塑料膜片对白炽灯光源透过照度值及照度分布图像进行实验研究得到及其相关之规律。     

配位化学课程中研究型教学模式探讨

In this paper, the implementation of research-oriented teaching mode in coordination chemistry was introduced, including the strategies, main contents and evaluation.     

Simulation of beam gas coulomb scattering in HALS

In conventional research on beam gas coulomb scattering(BGCS), only the related beam lifetime using the analytical method is studied. In this paper, using the particle-in-cell Monte Carlo collisions(PIC-MCC) method,we not only simulated the beam lifetime but also explored the effect of BGCS on the beam distribution. In order to better estimate the effect on particle distribution, we study the ultra-low emittance electron beam. Here we choose the He Fei Advanced Light Source. By counting the lost particles in a certain time, the corresponding beam lifetime we simulated is 4.8482 h/13.8492 h in x/y, which is very close to the theoretic value(5.0555 h /13.7024 h in x/y).By counting the lost particles relative to the collided particles, the simulated value of the loss probability of collided particles is 1.3431e-04, which is also very close to the theoretical value(1.3824e-04). Besides, the simulation shows there is a tail in the transverse distribution due to the BGCS. The close match of the simulation with the theoretic value in beam lifetime and loss probability indicates our simulation is reliable.