闪耀光纤光栅写制技术及解调技术研究

利用相位掩模法,对闪耀光纤光栅的写制技术进行了研究.在载氢光敏光纤中写制了不同倾斜角度的闪耀光纤光栅,给出了相应的结果谱图.利用闪耀光纤光栅的包层耦合模,通过侧面光检测技术,实现了一种以闪耀光纤光栅为分光器件的光纤光栅波长解调系统.对C波段的波长进行了解调,给出了实验系统及相应结果分析.     

Predictions for cross sections of light proton-rich isotopes in the ~(40)Ca + ~9Be reaction

The cross sections for Z=10–19 with isotopes T_z=-3/2 to-5 in the 140A Me V~(40)Ca+~9Be projectile fragmentation reaction have been predicted.An empirical formula based on the correlation between the cross section and average binding energy of an isotope has been adopted to predict the cross section.The binding energies in the AME16,WS4,and the theoretical prediction by the spherical relativistic continuum Hartree-Bogoliubov theory have been used.Meanwhile,the fracs parametrization and the modified statistical abrasion-ablation model are also used to predict the cross sections for the proton-rich isotopes.The predicted cross sections for the T_z=-3 isotopes are close to 10~(-10)mb,which hopefully can be studied experimentally.In addition,based on the predicted cross sections,Z=14 is suggested to be a new magic number in the light proton-rich nuclei with T_z-3/2,for which the phenomenon is much more evident than it is from the average binding energy per nucleon.     

基于自相关差分累积量的长码DS信号伪码周期估计

直接序列扩频（DS）信号,尤其是长码DS信号的截获一直都是电子战中的难题。文章提出的基于自相关差分累积量的方法,能够在非合作背景下对长码DS信号的伪码周期进行估计,实验结果表明,该方法能够在低信噪比条件下,对扩频调制比（信息比特持续时间和伪码周期之比）远小于1的长码DS信号的伪码周期进行有效估计。     

大功率脉宽调制放大器产品可靠性技术研究

本文从电路设计、工艺制作、产品应用方面阐述了大功率脉宽调制放大器产品可靠性设计的技术途径和设计规则。     

长飞公司被授予武汉市国家火炬计划实施20周年优秀企业

日前,鉴于长飞公司在发展光纤通信产业中的突出贡献,长飞公司被武汉市科教曷授予“武汉市国家火炬计划实施20周年优秀企业”称号。     

流动注射电化学发光分析法测定氨苄西林

基于氨苄西林对鲁米诺在铂电极上弱的电氧化发光信号的强增敏作用与流动注射技术的结合,建立了一种测定氨苄西林的电化学发光分析新方法。该法测定氨苄西林的检出限为5.0×10-8g mL,线性范围为8.0×10-8～5.0×10-5g mL,相对标准偏差为2.0%(n=11)。已成功地用于样品中氨苄西林的测定。     

Duplication： a Mechanism Producing Disassortative Mixing Networks in Biology

Assortative/disassortative mixing is an important topological property of a network. A network is called assortative mixing if the nodes in the network tend to connect to their connectivity peers, or disassortative mixing if nodes with low degrees are more likely to connect with high-degree nodes. We have known that biological networks such as protein-protein interaction networks （PPI）, gene regulatory networks, and metabolic networks tend to be disassortative. On the other hand, in biological evolution, duplication and divergence are two fundamental processes. In order to make the relationship between the property of disassortative mixing and the two basic biological principles clear and to study the cause of the disassortative mixing property in biological networks, we present a random duplication model and an anti-preference duplication model. Our results show that disassortative mixing networks can be obtained by both kinds of models from uncorrelated initial networks. Moreover, with the growth of the network size, the disassortative mixing property becomes more obvious.     

弹核碎裂反应中同位旋效应的系统研究

用统计擦碎模型对中能区不同弹靶体系在弹核碎裂反应中的同位旋效应和同位旋标度率现象进行了系统研究. 发现归一的同位素分布峰位差和约化的同位旋标度率参数随(Z_proj－Z)/Z_proj or (N_proj－N)/N_proj呈指数下降, 与反应系统大小无关. 指出约化的同位旋标度率参数可以用来研究中能重离子碰撞中反应系统的激发程度和非对称核物质的状态方程.     

NaF:F_2~( *)色心激光器褪色特性

F_2~( *)心具有高的斜率效率和低的泵浦阈值,其缺点是它的褪色特性。这种褪色是由于该色心重新取向和有害的漂白所引起,通常可用辅助光照重新取向或用电离中性的F_2心复原来加以补偿。NaF中F_2~( *)心在激光运转期间的光学稳定性取决于杂质二价离子的种类。用碱土离子Mg~(2 )Ca~(2 )代替过渡金属杂质,F_2~( *)心的光学稳定性会提高一些,但褪色仍相当严重。本文报道系统研究的一些实验结果。1.实验NaF晶体是在惰性气体(Ar)下用提拉法生长。所掺二价阳离子Ca~(2 )或Mg~(2 )以10~(-3)克分子/克分子浓度加入到熔料中,这是要保持晶体光学透明的最高掺杂量。用于激光实验的     

宽带专用和局部地区用户环路光传输系统

我们研制了采用波分复用技术双向传输模拟图象信号(电视会议服务)和数字信号的宽带专用用户传输系统,以及给用户传输模拟图象信号(CATV和VRS)的局部地区用户光传输系统。本文扼要介绍用户系统的光传输系统研究现状、用户系统的服务动向、系统的研制过程、系统构成以及技术概况等,然后叙述今后的研究课题。