武器系统地面电磁环境特性的测试方法研究

分析研究了地面电磁环境特性及其对武器系统工作状态的影响，提出了地面电磁环境特性的测试原理、方法和系统。这对武器系统的研制、生产和试验，以及地杂波特性的研究、地面电磁环境特性数据库的建立具有积极而重要的意义，使地面电磁环境特性的测试工作走向正规化和数字化。     

基于线结构光法的三维重建技术的研究

三维重建技术是计算机视觉方面的一个重要的应用。在此首先大体介绍了三维重建技术的发展;然后,介绍了基于线结构光法的三维重建技术;在详细介绍了数学模型的建立、照相机的标定、采集图像的处理、三雏重建方法这四个方面,从而对三维重建技术有了深入的了解。     

High-performance polymer light emitting diodes with interface-engineered graphene anodes

Recently, graphene-based organic light emitting diodes (OLEDs) were successfully demonstrated using graphene as anodes. However, the graphene electrodes have not been utilized for polymer light emitting diodes (PLEDs) yet, although the simpler device structure and the solution-based fabrication process of PLEDs are expected to be more advantageous in terms of time and cost. Here we demonstrate high-performance polymer light emitting diodes (PLEDs) with simple two-layer structures using interface-engineered single-layer graphene films as anodes. The single-layer graphene synthesized by chemical vapor deposition methods was transferred onto a glass substrate utilizing an elastic stamp, and its work function was engineered by varying the duration and the power of ultraviolet ozone (UVO) treatment. Thus, we were able to optimize the contact between silver electrodes and the graphene anodes, leading to the considerable enhancement of light-emitting performance.     

普通白光光源应用于ALA-PDT的实验研究

本文根据线光源高压汞灯的特点设计了一个用于光动力疗法的光反应室 ,它输出的光功率连续可调 ,波段选择简单灵活     

Yellow electroluminescent diodes utilizing poly(2,5-bis(cholestanoxy)-1,4-phenylene vinylene)

We report visible yellow light emission from diodes made from a new derivative of poly(p-phenylene vinylene). The soluble di-cholestanol derivative, poly(2,5-bis(cholestanoxy)-l, 4-phenylene vinylene), allows fabrication of the light emitting diodes by spinning the electroluminescent polymer film from solution prepared at room temperature with no subsequent processing or heat treatment required. These initial devices turn on at >8 V and have a peak emission wavelength of 570 nm at room temperature with quantum efficiencies of approximately 0.3% photons per electron.     

基于稳健自适应频率采样的宽频电磁数值仿真

已有的基于Stoer-Bulirsch有理函数插值的自适应频率采样算法往往对插值间隔、收敛精度等参数非常敏感,算法稳定性差,甚至会出现伪收敛等问题.针对已有算法的上述缺陷,通过采用极点判断、插值区域二分、参数变换和多次收敛性检验等措施,提出了一种逐一增加采样点的自适应策略.形成了一种通用性强、稳定性好的自适应频率采样算法,可以用较少的采样点插值重构未知函数响应.并结合多层快速多极子方法,对宽频带目标电磁散射进行计算分析,实现采样频点的自适应选取,减少了计算量极大的精确数值计算的次数,提高了仿真效率.     

Characterization of polymer bulk heterojunction photocell with unmodified C70 prepared with halogen-free solvent for indoor light harvesting

Although photocells are commonly characterized under AM1.5G 100 mW cm⁻² (1 sun) illumination, their performance under low light illumination is also important, because photocells are frequently used for indoor applications. In this study, polymer photocells based on a bulk heterojunction composite consisting of a low energy gap polymer PTB7 and unmodified C₇₀ prepared with a halogen-free solvent 1,2,4-trimethylbenzene have been characterized under the illumination of 1 sun or below. A typical photocell with the power conversion efficiency (PCE) of 4% at 1 sun shows the PCE of approximately 7% at 10⁻³ sun, which seems to fit for some indoor applications such as a permanent power source for a wireless sensor node. The sublinear dependence of short-circuit photocurrent on light intensity as well as the increase of fill-factor under low light illumination yields the increased efficiency under low light illumination. An analysis employing a one-diode equivalent circuit model suggests that the increased parallel resistance as well as the decreased saturation current of the diode under low light illumination accounts for the latter feature. It is also pointed out that the parallel resistance and/or the saturation current under dark strongly influence the PCE of a photocell under low light illumination. In addition, the dependence of the device performance on the light intensity is found to be useful for analyzing the effects of the thermal treatment and the PFN interlayer at cathode.     

非镜面散射条件高度测量研究

以现代信号处理和火箭外弹道理论为基础，综合利用武器系统和引信的先验信息，研究了在弹丸具有任意落速、落角、目标为平坦地面和非镜面散射条件下，引信距离面目标的垂直高度确定问题。从理论上解决了在假设条件下引信炸高测量问题，并给出了高度测量的具体运算方法。     

基于光纤传感器的油井温度场监测研究

针对目前油井井温常规测量方法存在的不足,提出了一种基于喇曼散射原理的油井温度在线监测方案,对其可行性进行了分析验证,构建了基于分布式光纤传感器的油井温度场监测系统.实验证明该系统具有良好的空间定位精度和温度分辨率,可以在不影响温度场原始分布的情况下实现对多点温度的分布式实时快速测量.     

机载可见光摄像机调光方法研究

针对机载光电平台可见光摄像机在执行任务时所面临的场景多样性的特点,对现有调光方法进行了研究,提出一种灰度平均值与区域信息熵相结合的调光方法.方法分为3个步骤,首先是灰度平均值法初调,获得大致清晰的图像;其次是地面人员提取感兴趣目标区域;最后是目标区域内利用信息熵法进行调光.实验结果表明,利用此方法可以获得亮度合适、目标...