一种新型桥路型HTSFCL的实验研究

在研究一种新型桥路型高温超导限流器的限流原理的基础上，研制开发了一台三相600V、故障电流峰值100A的实验室样机．本文介绍了该限流器的功率电路、控制器、低温容器和高温超导磁体等部分的结构特点和功能．在三相系统中进行了各种短路故障限流实验，结果表明该限流器有较强的限流能力和重合闸能力，说明新型高温超导限流器的研究对改善电网动态性能和提高电网电能质量有十分重要的意义．     

RIBLL终端LASCAR闪烁体阵列探测器研制进展

介绍了RIBLL终端LASCAR闪烁体阵列探测器的工作原理和结构特点. 描述了为满足放射性核束实验的要求而对阵列所作的重要改进. 给出了LASCAR构型优化改造的工作设想和实施步骤. The principles and structure characteristics of LASCAR scintillator array detector at RIBLL terminal are described. Special emphases are laid upon the latest progress for the development of LASCAR array detector to meet the requirements of the RIB experiments. The working plan and steps for optimizing configuration of the LASCAR multi unit neutron scintillator array detector are also presented.     

第二配体对Sm(DBM)3掺杂的PMMA样品发光的影响

分别使用phen（1,10-邻菲咯啉）、TOPO（三正辛基氧化磷）、TPPO（三苯基氧化磷）作为第二配体与Sm（DBM）3（DBM：二苯甲酰甲烷）相互作用,合成了相应的配合物,然后分别将其掺入MMA中,进行聚合得到了固体样品。测量了不同第二配体样品及无第二配体样品的激发和发射光谱,对谱峰做了指认。发射谱中主要发射峰均为Sm^3＋的特征发射,有机配体的发光带很弱,说明从有机配体到稀土发光中心的能量传递非常有效。监测Sm^3＋离子644nm发射峰（^4G5/2→^6H9/2）测量了样品的激发光谱。结果显示,第二配体的加入改变了有机配体的能级结构,激发边出现明显的移动,同时紫外区的激发效率发生了变化,对发光产生了显著的影响。还测量了上述样品中Sm^3＋的^4G5/2能级的发光衰减曲线,拟合出该能级的跃迁寿命,针对不同第二配体的情况进行了比较分析。实验结果表明,第二配体的共轭性和化学键匹配对发光强度影响很大,在我们的结果中,第二配体为TPPO时发光效率最高。     

操作参数对PEM燃料电池中水迁移的影响

质子膜内水分和阴极多孔电极中液态水含量是PEM燃料电池正常运行的控制因素。本文给出了一个用于研究PEM燃料电池内水迁移的稳态、等温、两相流模型。模型耦合了连续方程、动量守恒方程和物质守恒方程,以及水在质子膜中传递方程。运用试验结果验证了模型的有效性。分析模拟结果表明,增大系统操作压力、升高电池操作温度和降低加湿温度将会使质子膜中水的净迁移通量增大;增大操作压力、降低操作温度和升高加湿温度会增加阴极CTL与GDL界面上液态水含量。     

质子交换膜燃料电池低化学计量比的性能研究

以质子交换膜燃料电池实际应用为背景,研究了在反应物低化学计量比下,质子交换膜燃料电池不同温度、压力下的性能。得到了电池温度,压力对反应物化学计量比的影响。实验结果表明,反应物化学计量比1.0的电池性能低于足量反应气体工况下的电池性能;化学计量比为1.3时,电池能够在预期电流强度下稳定运行;反应气体的传质过程影响反应所需的化学计量比;当提升压力至0.13 MPa,化学计量比1.0的电池性能与足量反应气体工况下的性能相当。     

Separability of Bipartite Superoperator Based on Witness

Based on the isomorphic relation between operator space L(H) and Hilbert space H^⊕2, Cirac et al. mapped the global superoperator to a mixed state E which has the same separability of the initial superoperator. Zhang et al. [Phys. Rev. A 76(2007)012334] provided a calculable lower bound for both the linear and nonlinear witness. We use this bound to detect the entanglement of E to judge the separability of the initial superoperator. With the help of local orthogonal observables, we directly describe the separable condition of superoperator by its each operator. Lastly, using the lower bound of the nonlinear witness, we provide a calculable entanglement factor of bipartite superoperator.     

A Scheme for Atomic Entangled States and Quantum Gate Operations in Cavity QED

We propose a scheme for controllably entangling the ground states of five-state W-type atoms confined in a cavity and realizing swap gate and phase gate operations. In this scheme the cavity is only virtually excited and the atomic excited states are almost not occupied, so the produced entangled states and quantum logic operations are very robust against the cavity decay and atomic spontaneous emission.     

连续变量量子离物传态的实验研究

利用单个Ⅱ类相位匹配OPA产生的双模压缩态实现连续变量压缩纠缠态，完成了连续变量量 子离物传态. Ⅱ类相位匹配OPA参量反放大过程可以实现正交振幅反关联、正交位相关联的 压缩纠缠态，这不同于一般运转于阈值以下的OPO产生的正交振幅关联、正交位相反关联的 压缩纠缠态，可以采用直接平衡测量的方法完成Bell态测量. 利用双KTP补偿非线性过程的 离散效应，获得了最大压缩大于2dB的双模压缩纠缠态，实现保真度06，考虑到探测效率 实际保真度为057. 这种方案简化了测量方法与纠缠光源产生装置，有利于进行量子通信 的实验研究与应用. 同时，讨论了探测过程中的一些非理想因素. 关键词： 量子离物传态 压缩纠缠态 Bell态测量     

Multi-hybrid method for investigation of EM scattering from inhomogeneous object above a dielectric rough surface

An iterative strategy combining Kirchhoff approximation(KA) with the hybrid finite element-boundary integral(FE-BI) method is presented in this paper to study the interactions between the inhomogeneous object and the underlying rough surface.KA is applied to study scattering from underlying rough surfaces,whereas FE-BI deals with scattering from the above target.Both two methods use updated excitation sources.Huygens equivalence principle and an iterative strategy are employed to consider the multi-scattering effects.This hybrid FE-BI-KA scheme is an improved and generalized version of previous hybrid Kirchhoff approximation-method of moments(KA-MoM).This newly presented hybrid method has the following advantages:(1) the feasibility of modeling multi-scale scattering problems(large scale underlying surface and small scale target);(2) low memory requirement as in hybrid KA-MoM;(3) the ability to deal with scattering from inhomogeneous(including coated or layered) scatterers above rough surfaces.The numerical results are given to evaluate the accuracy of the multi-hybrid technique;the computing time and memory requirements consumed in specific numerical simulation of FE-BI-KA are compared with those of MoM.The convergence performance is analyzed by studying the iteration number variation caused by related parameters.Then bistatic scattering from inhomogeneous object of different configurations above dielectric Gaussian rough surface is calculated and the influences of dielectric compositions and surface roughness on the scattering pattern are discussed.     

池水瞬态闪蒸时间的实验研究

实验研究了过热度、初始水温及水位高度对方腔内池水瞬态闪蒸时间的影响.实验条件为:水位高度40 mm、60mm、100 mm,初始水温36～88℃,过热度2.1～48℃.实验结果表明:过热度及水位高度是影响闪蒸时间的主要因素,过热度及水位高度越大,闪蒸时间越长;过热度相同时,初始水温对闪蒸时间的影响很小.通过对实验数据分析,拟合出瞬态闪蒸时间的计算关联式.