热像仪空间NETD测量技术

凝视阵列型热像仪的空间噪声制约着热像仪对远距离目标的探测、分辨、跟踪性能。为解决热像仪空间噪声实际测量问题,分析了热像仪的空间噪声测量原理,给出了热像仪基于信号传递函数的空间噪声测量数学模型,介绍了热像仪某一组、某一区域或全部像素如何剔除时间域NETD,再通过统计计算得到其空间NETD的数学模型。对制冷型MCT320256凝视列阵热像仪的SiTF和空间NETD进行测量,当背景黑体温度为5 ℃时,FOV区域中心信号传递函数（SiTF）为27.29 mV/℃,NETD为0.128 ℃,20 ℃时FOV区域中心SiTF为29.03 ℃,NETD为0.121 ℃。测量结果表明:该方法可评估空间噪声对热像仪性能的影响。     

A compact graphene Q-switched erbium-doped fiber laser using optical circulator and tunable fiber Bragg grating

We demonstrate a passively Q-switched tunable erbium-doped fiber laser(EDFL)based on graphene as a saturable absorber(SA).A three-port optical circulator(OC)and a strain-induced tunable fiber Bragg grating(TFBG)are used as the two end mirrors in an all-fiber linear cavity.The Q-switched EDFL has a low pump threshold of 23.8 mW.The pulse repetition rate of the fiber laser can be widely changed from 9.3 kHz to 69.7 kHz by increasing the pump power from23.8 mW to 219.9 mW.The minimum pulse duration is 1.7μs and the highest pulse energy is 25.4 nJ.The emission wavelength of the laser can be tuned from 1560.43 nm to 1566.27 nm by changing the central wavelength of the straininduced TFBG.     

逆向成像法畸变测试技术研究

在相对畸变的定义下,提出了逆向成像畸变测试方法。通过把目标靶尺放到被测系统的焦面位置,再将被测光学系统的入瞳位置放到精密转台的转轴位置,将被测光学系统从正向最大视场处向负向最大视场处旋转,测量14个视场点后,可得到各个视场的畸变值。该方法严格要求把被测光学系统的入瞳位置放置在精密转台的旋转轴上,否则无法测量出整个视场的畸变值。焦距测量精度达2 m,畸变测量精度达5.010-4。     

La2/3Ca1/3MnO3薄膜自旋输运特性研究

本文通过射频磁控溅射法制备了La2/3Ca1/3MnO3(LCMO)薄膜.该薄膜在接近峰值电阻温度Tp(Tp=308K)发生铁磁金属相-顺磁绝缘体相相变.磁场的作用下,电阻温度曲线较无磁场时发生右移,而且Tp点也向高温移动,(H=0.5T时,Tp≈314K;H=1.0T时,Tp≈318K);1T磁场所产生最大的磁电阻值为34%.激光作用下,电阻温度曲线向左移动,Tp变为300K,其最大的光致电阻变化相对值为43.5%.能带理论定性分析表明产生这一不同现象主要是由于eg电子的不同状态引起的.     

50 keV/u Ne8+与CO转移电离反应中分子轴取向效应测量

利用反应显微成像谱仪,研究了50 keV/u Ne8+碰撞CO转移电离反应中生成的CO2+碎裂过程。通过重构分子离子爆炸碎片C+和O+的三维动量,获得了质心系中CO2+碎裂过程中释放的动能（KER）。在KER谱中发现了来自亚稳态1Σ+,1Π,3Π解离的峰、3Σ+态解离的峰和1Σ_（II）+态解离的峰,同时发现了排斥态3Σ-的贡献。在3Σ-态解离的分子轴取向分布中,首次观测到CO2+解离的分子轴取向效应。The fragmentations of CO2+ are studied in transfer ionization processes of 50 keV/u Ne8+ impact on CO with reaction microscopes. The 3D momenta of C+ and O+ were measured, and the kinetic energy release (KER) of dissociative(CO2+) was obtained accordingly. The peaks resulted from the metastable states of 1Σ+, 1Π and 3Π, of 3Σ+, and of 1Σ(II)+ are identified in KER spectrum. Meanwhile, the repulsive state of 3Σ- was also observed, which forms a broad peak lying between the peaks of 3Σ+ and 1Σ(II)+. In the CO2+ dissociations from 3Σ- state, the orientation effect of CO molecular axis was observed for the first time.     

Performance improvement of AlGaN-based deep ultraviolet light-emitting diodes with double electron blocking layers

The AlGaN-based deep ultraviolet light-emitting diodes(LED) with double electron blocking layers(d-EBLs) on both sides of the active region are investigated theoretically. They possess many excellent performances compared with the conventional structure with only a single electron blocking layer, such as a higher recombination rate, improved light output power and internal quantum efficiency(IQE). The reasons can be concluded as follows. On the one hand, the weakened electrostatic field within the quantum wells(QWs) enhances the electron–hole spatial overlap in QWs, and therefore increases the probability of radioactive recombination. On the other hand, the added n-AlGaN layer can not only prevent holes from overflowing into the n-side region but also act as another electron source, providing more electrons.     

基于复杂性和成本的NPD项目权变管理策略研究

本文在项目管理的选择法和学习法的组合模式的基础上,提出同时采用多方案并行和强化学习两种管理策略能有效应对NPD项目的复杂性。在如何决定并行数量和学习强度的问题上,基于效率准则进行了理论分析,提出了主要的权变变量,即复杂性和成本。并基于NK模型进行了仿真模拟,探讨了不同情境下,项目绩效随两种管理策略的变化规律。     

市场利率环境下银企信贷信息共享信号传递博弈模型

在市场利率环境下,运用信号传递博弈理论,在成本倒挂情况下,采取利息补贴承诺的方法,设计一种以风险分担实现利润共享的契约机制,利润共享参数起到了传递信息的信号作用。研究结果表明,在该契约下企业没有撒谎的动机,契约参数是传达信息的信号。该契约机制下不仅可以实现信贷资金供求信息的共享,而且能够保证系统的协调,系统收益达到最优,使企业能够得到新产品生产所需资金,银行解决信贷资金的风险损失的问题。     

变系数两点边值问题的有限元强校正格式

该文利用投影型插值,对于变系数两点边值问题,获得了一个高精度的有限元强校正格式,数值实验更验证了这一结果．     

THE ANALYSIS OF THE TRANSLATION-TORSION COUPLING EARTHQUAKE RESPONSES OF SINGLE-STORY ECCENTRIC FACTORY BUILDINGS WITH CONSIDERATION OF ROOF WHOLE-SPACE-WORK

In this paper, the translation-torsion coupling earthquake responses, of single-story ecoentric factory buildings with consideration of whole-space-work of the roof in 3-dimension non-inertia system are analysed and studied, and its calculation model has been established. And what is more, corresponding motion equations of earthquake responses have been derived, analysed and discussed. And it points out that under the action of the earthquake including rotational component, the principle of superposition of independent action for each earthquake component and mode-superposition method of dynamic responses analysis are already not applicable. In this paper, the translation-torsion coupling earthquake responses of sorne singlestory eccentric factory building are calculated and analysed by comparison methods without consideration of the earthquake torsional component. The conclusion is that when whole-space-work of the roof is considered, the results of calculation are more conformable to the actual earthq