Time-division phase modulated single-photon interference in a Sagnac interferometer

We introduce a stable, long-distance singlephoton Sagnac interferometer, which has a balanced configuration to efficiently compensate phase drift caused by change of the fiber-optic path. By using time-division phase modulation, single-photon interference was realized at 1550nm in a 5-km-long as well as 27-km-long Sagnac fiber loops,with a fringe visibility higher than 90% and long-term stability. The stable performance of the single-photon interference indicated that the time-division phase-modulated Sagnac interferometer might readily lead to practical applications in single-photon routing and quantum cryptography.     

Expression of human clotting factor Ⅸ mediated by recom- binant lentiviral vector in cultured cells and hemophilia B mice

To explore the expression of human clotting factor Ⅸ (hFⅨ) cDNA in vitro and the feasibility of gene therapy for hemophilia B mice mediated by recombinant lentiviral vector, a recombinant hFⅨ lentiviral vector driven by ubiquitin-C promoter, FUXW, and by ABP liver specific promoter, FAXW, was constructed respectively. Recombinant lentivirus was harvested from 293T cells by calcium phosphate-mediated transient cotransfection of three plasmids (transgene vector, CMV腞8.2, VSV-G). hFⅨ expression was detected in supernatant of 293T, BHK and L-02 cells infected with FUXW virus, whereas higher expression of hFⅨ levels (630 ng/106 cells/48 h) was detected only in L-02 cells infected with FAXW virus. Serum hFⅨ antigen was detected in all hemophilia B mice treated with FAXW virus by tail vein injection, an efficiency level of hFⅨ was observed (45 ng/mL, approximately 1% of normal human levels), the expression lasted for more than 60 d. The results indicated that HIV-based lentiviral vectors offer a promising approach to the gene therapy of hemophilia B.     

An iterative algorithm in potential-field inversion

1　Principle and MethodAll the problems of potential- field inversioncan be concluded that of solving nonlinear functionas follows:b =f( x) ( 1 )where x =( x1,x2 ,… .xn) T,xj( j =1 ,2 ,… ,n)indicate geometricparameters and physical parame-ters of the object;b=( b1,b2 ,… ,bm) T,bi( i=1 ,2 ,… ,m) indicate potential- field measurements.Main algorithms for expression( 1 ) are leastsquare method ( include damping least squaremethod ) ,gradient method ( conjugate gradientmethod and variable met…     

改变水分子簇的结构及诱发的生物效应研究

概述了水分子簇理论研究的基本状况,以及改变水分子团簇结构的4种方法,包括外加磁场、外加电场、激光辐射以及直接加热法;最后简要介绍了改变水分子团簇结构所诱发的生物效应.     

开关稳压电源性能的改进

详细分析了开关稳压电源的工作过程，并针对功率晶体管的二次击穿，提出了RC吸收网络，并通过优化基极驱动减少晶体管的开关损耗，从而提高开关稳压电源的性能。     

浅谈管理创新与高校图书馆可持续发展

管理创新是高校图书馆实现可持续发展的重要因素。面对信息环境下图书馆的巨大变革与发展，高校图书馆必须摒弃传统的管理方式，用新的管理理念建设图书馆：图书馆在可持续发展战略中既是信息的提供者，也是信息的使用者。图书馆立法是实现可持续发展的保障。     

煤矿物资采购价值工程分析研究

就煤矿在物资采购当中存在的一些问题,经过应用ABC分析法分析,选择出了在物资采购当中应该重点采购和管理的重点物资根据价值工程原理对订购影响因素进行了功能和成本分析,建立了物资采购供应方选择决策模型,为煤矿企业的物资采购提供了有力的决策支持,对企业降低物资采购成本、提高物资采购效益有着重要的意义.     

基于PC/104总线的电传操纵系统检查仪设计

主要阐述了基于PC／104总线的电传操纵系统检查仪的软、硬件设计，提出了使用数据库技术编写测试库，简化测试软件编程的方法。经实际使用表明：该检查仪具有自动化高、测试速度快、精度高、操作简单、可维护性好等特点。     

关于三点三边与四点三边有向图的图设计

主要讨论了三点三边与四点三边的有向图的图设计存在性问题，得到了以下三个结论：(1)：存在(v，H，1)-GD，当且仅当v≡0.1(mod3)，v≥3；(2)：存在(v，G1，1)-GD，当且仅当v≡0.1(mod3)，v≤4；(3)：存在(v，G2，1)-GD，当且仅当v≡0.1(mod3)，v≥4；(其中：H表示三点三边有向图，Gi表示四点三边有向图)