近红外原位研究杂多酸引发的环氧-四氢呋喃阳离子聚合

用近红外光谱原位跟踪的方法, 研究了杂多酸催化的环氧树脂和四氢呋喃的阳离子聚合过程. 发现在低环氧树脂含量下, 环氧消耗速率在整个聚合过程中维持不变; 而在高环氧树脂含量下, 环氧消耗速率则随时间有所下降. 通过红外光谱在碳氢区域的分峰分析, 证明环氧树脂与四氢呋喃发生了共聚反应, 二维红外光谱的结果也确证了这一结果. 此外, 还探讨了环氧转化速率与环氧含量间的关系.     

Tuning of the cosmic-ray test system of the BESⅢ drift chamber

The BESⅢ drift chamber and its subsystems need a cosmic-ray test after the chamber construction to check the chamber construction quality,testing the joint operation of the whole system and the performance of the chamber.The noise performance,drift time and charge measurements,and the scanning of channels were examined specifically.The preliminary results of the test indicate that the whole system works well.     

Coupler design for an L-band electron linac

The RF coupler is a key component for an accelerating structure which is the most important component for a linac. In order to feed microwave power into the accelerating cavities effectively, the coupler has to be well matched with the feeding waveguide. In this paper, an electron linac coupler was designed, constructed and tested. A numerical simulation method based on the Kyhl's method was employed to search for the optimal dimensions of the coupler. The frequency and the coupling coefficient as a function of the coupler dimensions were also calculated. The results fitted the Kyhl's method simulation results well and gave tolerances of the coupler. The coupler was brazed to the accelerating cavities and it was cold-tested and hot-tested. The experimental results were consistent with the numerical simulation results.     

Computed laminography and reconstruction algorithm

Computed laminography (CL) is an alternative to computed tomography if large objects are to be inspected with high resolution. This is especially true for planar objects. In this paper, we set up a new scanning geometry for CL, and study the algebraic reconstruction technique (ART) for CL imaging. We compare the results of ART with variant weighted functions by computer simulation with a digital phantom. It proves that ART algorithm is a good choice for the CL system.     

神光Ⅲ原型装置实现8束基频光出光

由中国工程物理研究院激光聚变研究中心承建的神光Ⅲ原型装置是我国用于激光惯性约束聚变研究的新一代高功率固体激光驱动器。经过近半年的努力，原型装置各系统的联机调试已经基本结束，目前顺利实现了8束基频光出光的阶段目标，靶场系统集成安装也取得重要进展，已经进入联合调试阶段。     

双烷氧桥联的双核铜(Ⅱ)Schiff碱配合物的合成及配合行为

通过Salen型双肟配体H₂L¹(H₂L¹=5,5′-二(N,N′-二乙胺)-2,2′-[乙二氧双(氮次甲基)]二酚)与乙酸铜反应,合成了一种双核铜(Ⅱ)配合物[Cu₂(L²)₂](H₂L²=4-(N,N′-二乙胺)水杨醛O-(2-羟乙基)肟),并对其进行了X-射线衍射单晶结构分析。     

温度对吡啶离子液体性质影响的分子动力学模拟研究

运用分子动力学模拟方法研究了温度对三种吡啶离子液体[BPy][BF4]、[HPy][BF4]、[OPy][BF4]热力学性质的影响, 得到了每个体系的密度、自扩散系数、电导率和黏度等. 研究结果表明: 随着温度升高, 同一种离子液体的密度减小, 阴阳离子的自扩散系数明显增大, 电导率升高, 而黏度降低. 在同一温度下, 随着阳离子上烷基链的增长, 离子液体的密度减小, 但热力学性质的变化规律并不完全同步. 烷基链长最短的[BPy][BF4]的自扩散系数和电导率在每个温度下均为最大, 而黏度最小; 但烷基碳链更长的[OPy][BF4]和[HPy][BF4]的各种性质相差不大,甚至当温度大于323K时, 烷基链较长的[OPy][BF4]的自扩散系数比[HPy][BF4]的大.     

Analysis on Far-Field of Slab Waveguide and Its Gaussian Approximation

This paper researches end diffraction of slab waveguide and then matching efficiency between the far-field and its Gaussian approximate field is analyzed leads to a new definition of divergence half-angle. Finally, why the far-field can be approximated by a Gaussian function is presented according to characteristic of beam propagation factor.