掺氟碳纳米管电子性质的研究

利用第一原理方法讨论了掺氟碳纳米管的电子性质.与纯碳管相比,掺氟碳纳米管也能稳定存在,并具有更好的场发射性质.这是原子层次的材料设计.     

Generalized synchronization of continuous dynamical system

Generalized synchronization between two continuous dynamical systems is discussed.By exploring the Liapunov stability theory and constructing appropriately unidirectional coupling term,a sufficient condition for determining the generalized syn- chronization between continuous systems is proved.Two examples are used to show the effectiveness of this result.     

有色阻燃剂四环硅膦氧基对苯醌的合成与应用

以四氯对苯醌与二甲基硅酸三羟甲基氧化膦环状酯醇钠为主要原料,合成了一种有色阻燃剂四环硅膦亚甲氧基对苯醌,即四-1-氧代-1-磷杂-3,5-二氧杂-4,4-二甲基-4-硅杂环己基-<4>-亚甲氧基对苯醌(TOPDSMB)。探讨了反应时间、温度和摩尔比对产率的影响,并通过FT-IR,¹H-NMR、TG-DTA等表征产物的结构及性能。结果表明该产物在聚丙烯(PP)中添加量为20%时,其极限氧指数为28%。产物与三聚氰胺聚磷酸盐(MPP)复配后,在聚氯乙烯(PVC)和聚丙烯中添加量为20%(TOPDSMB∶MPP=1∶1)时,其极限氧指数均为30%。     

有散射区和Andreev反射面的单通道导体的导纳

采用分立势模型和有效散射矩阵方法, 通过引入正常导体-超导体复合介观系统的局部态密度以及发射率和入射率，计算了有散射区和Andreev反射面的单通道导体的导纳.     

HL-2A װ��EPICS ���̱��������Զ���ϵͳ

通过分析子系统接入EPICS平台时大量的数据定义以及数据转换问题,研究了EPICS IOC数据库构成和EPICS数据组成结构。采用基于ASP.NET构架的C#编程技术实现了EPICS过程变量(PV)管理自动化系统,并提供相应的操作界面。该系统解决了IOC PV信息收集与数据保障的问题,实现了PV的批量存储、权限管理、历史查询和实时更新等功能。     

指数函数型复合函数的研究

指数函数与其他函数复合后形成复合函数,     

可扩流的拓扑压及其局部横截

研究了紧致度量空间上可扩流的拓扑压与其局部横截的联系.我们证明了以下结论:1.一致可扩流的拓扑压可以在其整体的局部横截上确定;2.可扩流及其在局部横截上所诱导的符号扭扩流具有相同的拓扑压.     

磁场作用下的有机电致发光

分别制备了荧光器件ITO/NPB/Alq₃/LiF/Al和磷光器件ITO/NPB /CBP: Ir（ppy）₃/BCP/Alq₃/LiF/Al, 测试了50 mT磁场作用下器件的I-V和L-V特性. 与零磁场相比荧光器件和磷光器件的效率分别增加了44%和7%. 从有机电致发光的机制出发对该现象进行了解释, 认为外加磁场可以使三重态激子发生塞曼分裂, 进而在荧光器件中引起了三重态激子T     

Implementation Scheme of Two-Photon Post-Quantum Correlations

The pre-and post-selection processes of the "two-state vector formalism" lead to a fair sampling loophole in Bell test, so it can be used to simulate post-quantum correlations. In this paper, we propose a physical implementation of such a correlation with the help of quantum non-demolition measurement, which is realized via the cross-Kerr nonlinear interaction between the signal photon and a probe coherent beam. The indirect measurement on the polarization state of photon is realized by the direct measurement on the phase shift of the probe coherent beam, which enhances the detection efficiency greatly and leaves the signal photon unabsorbed. The maximal violation of the CHSH inequality 4 can be achieved by pre-and post-selecting maximally entangled states. The reason why we can get the post-quantum correlation is that the selection of the results after measurement opens fair-sampling loophole. The fair-sampling loophole opened here is different from the one usually used in the currently existing simulation schemes for post-quantum correlations,which are simulated by selecting the states to be measured or enlarging the Hilbert space. So, our results present an alternative way to mimic post-quantum correlations.     

薄壁快脉冲252Cf裂变电离室的研制及性能测试

介绍了用于中子探测器效率刻度的薄壁快脉冲252Cf裂变电离室。 在用飞行时间法测量中子能谱时, 该裂变电离室能够给出252Cf裂变中子发射时刻信号, 输出脉冲上升时间约为5.5 ns, 电离室由厚度为0.15 mm的不锈钢构成。 测试结果表明, 对裂变碎片的探测效率为99.2%, α粒子脉冲幅度和碎片脉冲幅度可清晰分开。A thin wall, fast pulse 252Cf ionization chamber, which was designed for calibrating efficiency of neutron detectors, was described. The ionization chamber can be used as the start detector in time of flight measurements of the 252Cf fission neutron spectrum. The chamber is composed of 0.15 mm thick stainless steel, the rise time of pulse signals is about 5.5 ns. As the test result shows, the detection efficiency of fission fragments is 99.2%, and pulse signals caused by fissions are distinguished clearly from those caused by α decays.