(Zn_(1/3)Nb_(2/3))~(4+)取代的BNT系无铅压电陶瓷性能

采用两步合成工艺,制备了新型Bi1/2Na1/2Ti1–x(Zn1/3Nb2/3)xO3(简称BNTZN—100x)系无铅压电陶瓷。研究了B位复合离子(Zn1/3Nb2/3)4+取代量对BNT陶瓷介电及压电性能的影响。结果表明:当0.005≤x≤0.020时,该体系陶瓷具有三方、四方共存的准同型相界(MPB)结构。在MPB附近,具有较佳的压电性能:当x为0.020时,d33为97pC/N,kt为0.47。εr-t曲线显示该体系材料具有明显的弥散相变特征。具有高kt值,低kp值;kt/kp较大,具有较大的各向异性,是一种适合高频下使用的优良超声换能材料。     

On Solving TM0n Modal Excitation in a Ka-Band Overmoded Circular Waveguide by the Conservation of Complex Power Technique

To measure the radiation properties of relativistic diffraction generator (RDG) in Ka-band, a TM0n modal excitation model is established, which consists of an overmoded circular waveguide and a coaxial line feeding probe. Using the transverse E-field mode matching and the conservation of complex power technique (CCPT), we deduce the scattering matrix at coaxial line to coaxial line and coaxial line to circular waveguide junctions. Then using the overall cascaded junction scattering matrix, the numerical results for the reflection coefficient of the coaxial line and the power distribution of TM0n multi-modal are presented. The numerical results are in agreement with HFSS simulation results and experimental results. The analysis shows that by choosing the appropriate position of coaxial line probe, the power proportion of the device operating mode excited in circular waveguide could be the largest.     

基于矩量法的印刷电路板的辐射分析

利用结合二级离散复镜像的矩量法,分析印刷电路板上微带线的电磁辐射问题.应用复镜像理论,详细地推导了微带线结构的闭式空域格林函数和计算公式.针对不同长度和不同端接负载的两平行微带线,进行了辐射研究.仿真结果表明,谐振长度的开路耦合线,产生的辐射功率大;端接匹配负载的耦合线,产生的辐射功率小.为此在高频数字电路设计中,必须确保线长不与谐振长度接近,终端均阻抗匹配.     

Dependence of Pt(II) based phosphorescent emitter orientation on host molecule orientation in doped organic thin films

We report that the molecular orientation of a disk-shaped Pt(II) complex dopant in organic thin films is linearly proportional to the orientation of the host molecules. We ascribe this relationship to the parallel alignment of the Pt complex with the host molecules induced by a π-π interaction. This would be caused by their planar and conjugated structure, indicating that the intermolecular interaction and steric effect play an important role. This finding can be applied to obtain a horizontal emitter orientation, resulting in highly efficient OLEDs based on Pt(II) complexes.     

复杂环境下直扩信号侦察技术

侦察设备和目标存在径向速度变化导致接收信号存在多普勒频率变化,这将导致常规方法无法完成直接序列扩频信号(Direct-Sequency Spread Spectrum,DSSS)侦察。针对该情况研究了多普勒频率变化对常规检测方法的影响。提出一种针对多普勒频率变化时的直接序列扩频信号侦察技术,新技术消除了多普勒变化带来的影响,恢复了直接序列扩频信号的周期特征,能够在复杂环境低信噪比情况下完成直接序列扩频的检测和参数估计。理论分析和仿真验证表明该方法具有运算量小、精度高和易于硬件实现的特点。     

电磁吸波材料研究进展

阐述了常见的吸波材料种类及其特点,吸波材料的研究现状,重点介绍了纳米铁氧体吸波材料及其制备方法。笔者采用柠檬酸盐sol-gel法制得了均匀包覆铁氧体的空心微珠为基的复合材料,其吸波性能良好。最后指出吸波材料的发展趋势为纳米化、多元化和多介质化。     

Efficient single layer RGB phosphorescent organic light-emitting diodes

We report efficient single layer red, green, and blue (RGB) phosphorescent organic light-emitting diodes (OLEDs) using a “direct hole injection into and transport on triplet dopant” strategy. In particular, red dopant tris(1-phenylisoquinoline)iridium [Ir(piq)₃], green dopant tris(2-phenylpyridine)iridium [Ir(ppy)₃], and blue dopant bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium [FIrpic] were doped into an electron transporting 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) host, respectively, to fabricate RGB single layer devices with indium tin oxide (ITO) anode and LiF/Al cathode. It is found that the maximum current efficiencies of the devices are 3.7, 34.5, and 6.8 cd/A, respectively. Moreover, by inserting a pure dopant buffer layer between the ITO anode and the emission layer, the efficiencies are improved to 4.9, 43.3, and 9.8 cd/A, respectively. It is worth noting that the current efficiency of the green simplified device was as high as 34.6 cd/A, even when the luminance was increased to 1000 cd/m² at an extremely low applied voltage of only 4.3 V. A simple accelerated aging test on the green device also shows the lifetime decay of the simplified device is better than that of a traditional multilayered one.     

基于改进ICP的复杂机械零件测量点云配准方法

点云配准是基于机器视觉进行复杂机械零件三维非接触精密测量的关键环节。针对传统迭代最近点(iterative closest point, ICP)算法对初始位置依赖性强,迭代收敛速度慢,错误对应点对多,难以满足大批量复杂机械零件测量点云配准效率和精度要求的问题,提出了一种基于ISS-FPFH(intrinsic shape signature-fast point feature histogram)特征结合改进ICP的复杂机械零件测量点云配准方法。为了减少点云配准数量,并保留点云表面原来的细微特征,提出了基于重心邻近点的体素滤波器对点云进行下采样预处理。为解决传统ICP算法因合适初始位置难以确定而导致多视角测量点云配准失败的问题,采用了基于ISS-FPFH特征的采样一致性初始配准(sample consensus intial alignment, SAC-IA)算法进行粗配准。为解决传统ICP算法迭代收敛速度慢、错误对应点对多的问题,提出结合法向量夹角约束的点到平面ICP算法进行精配准。以斯坦福大学的bunny点云模型为对象,验证了本文提出方法对噪声点云的鲁棒性。以常见的复杂机械零...     

机动雷达地网接地电阻的预估算法

系统接地问题是制约机动雷达机动性能的关键因素之一。通过对垂直地网、水平地网、复合地网三种机动地网技术的理论研究与测试验证,提出了不同地网技术接地电阻的近似计算方法,并在理论推导的基础上,提出了机动地网接地电阻的预估算法。经实际测试证明本文所提算法简单可行,并且已经在某型号机动雷达上开展了实际应用,能够为后续机动雷达应急接地提供重要的技术保障。     

川东南盆缘复杂构造区深层页岩气富集特征

以川东南盆缘复杂构造区南川地区为研究对象,基于钻井、实验分析测试等资料,开展深层页岩气富集特征研究,重点讨论地层温度、地层压力等成藏环境变化对深层页岩气富集的影响作用。研究认为：(1)优势沉积相带是页岩气藏成烃的基础,研究区五峰组—龙马溪组一段形成于深水陆棚沉积环境,优质页岩发育,具备形成页岩气藏的良好物质条件。(2)有机碳含量控制纳米级有机质孔隙的发育程度,高压—超高压环境有利于孔隙的保持,对改善深层页岩物性发挥积极作用。(3)深层页岩气具有高温、高地应力的典型地质特征。温度较压力对页岩吸附能力的影响更为明显,深层页岩气赋存方式以游离气为主;高上覆地层压力导致页岩渗透率呈指数下降,页岩气运移能力显著减弱,逸散程度降低,有利于页岩气原位聚集。(4)温度、压力变化对气体扩散作用影响复杂,高温会增大气体的扩散系数,加剧气体的运移和逸散,而高压可以减缓或抑制气体的流动,有利于页岩气保存。(5)埋深与压力系数呈现一定的正相关性,埋深对向斜型页岩气藏压力系数的影响作用显著,表明深层向斜型页岩气保存条件趋好。埋深较大的残留向斜核部、凹中隆、有反向逆断层遮挡的斜坡区是复杂构造区页岩气勘探的有利目标。