基于坐标变换的机器鱼顶球算法

为了使机器鱼的顶球兼备速度性和连贯性并提高带球进攻效率,提出一种基于坐标变换的顶球算法。在分析典型的顶球算法的基础上,设计了机器鱼的几种简单动作,依据机器鱼、球和对方球门的坐标几何位置关系的设计决策机制来选择机器鱼下一步动作,并在多水中机器人协作控制平台上进行了单鱼顶球实验。实验结果表明,该算法是有效的,能大大提高机器鱼顶球效率和缩短一次进球所需要的时间。     

Properties of Indium-Doped ZnO Films Prepared in an Oxygen-Rich Plasma

Indium-doped zinc oxide (ZnO:In) films were prepared in an Ar:O₂ plasma by reactive magnetron sputtering. The x-ray diffraction (XRD) patterns presented the crystal structures of ZnO:In films, while transmission spectra and photoluminescence (PL) spectra showed the changed band gap and the visible emission from defects, as compared to the PL spectra of undoped ZnO films. It was concluded that the increase of substrate temperature enhanced the crystal quality of ZnO:In films; the incorporation of In made the c-axis constant of the samples larger than that of undoped ZnO films; the blue emission was due to the transition from an unknown donor level by indium doping to the valance band; and the orange-green emission originated from acceptor defects (O_Zn) formed in the O-rich plasma. Meanwhile, the current- voltage characteristics and persistent photoconductivity phenomenon also could be explained by the increased acceptor defects (O_Zn) that formed when the substrate temperature was increased.     

基于通道参数估计的多输入多输出雷达定位

针对统计MIMO雷达定位精度和目标分辨力不高的现状,提出基于收发通道参数估计的高精度MI-MO雷达定位方法。与传统做法不同,该方法采用共轭信号延迟发射模式,处理回波数据时首先估计MIMO雷达虚拟通道的系数,再利用估计结果修正目标参数估计模型,对目标实施定位。理论分析和仿真结果均表明:该方法极大地提高了统计MIMO雷达的定位精度和目标分辨能力,充分开发了大间距配置MIMO雷达参数估计的潜能。     

Nanoneedle Platforms: The Many Ways to Pierce the Cell Membrane

Establishing techniques to efficiently and nondestructively access the intracellular milieu is essential for many biomedical and scientific applications, ranging from drug delivery, to electrical recording, to biochemical detection. Cell penetration using nanoneedle arrays is currently a research focus area because it not only meets the increasing therapeutic demands of cell modifications and genome editing, but also provides an ideal platform for tracking long‐term intracellular information. Although the precise mechanism driving membrane penetration by nanoneedle arrays is still unclear, the low cytotoxicity, wide range of delivered materials, diverse cell type targets, and simple material structures of nanoneedle arrays make these splendid platforms for cell access. Here, the recent progress in this field is reviewed by examining device architectures and discussing mechanisms for nanoneedle penetration, and the major studies demonstrating the most general applicability of nanoneedle arrays, typical methodologies to access the intracellular environment using nanoneedles with spontaneous or assisted penetration modes, as well as biosafety aspects are presented. This review should be valuable for deeply understanding the materials fabrication principles, device designs, cell penetration methodologies, biosafety aspects, and application strategies of nanoneedle array‐based systems that are of crucial importance for the development of future practical biomedical platforms.     

末端防御武器火控系统面临的挑战与发展建议

为进一步提高末端防御武器装备信息化、自动化能力,对末端防御武器火控系统面临的问题及发展方向进行研究。在综合分析国外末端防御装备火控技术发展与应用现状的基础上,总结末端防御武器系统火控系统的发展趋势及需求,指出我国火控技术与装备发展面临的技术问题与挑战,并提出了6点发展建议。该研究可为加强装备的战术应用,提高陆军一体化作战协同能力提供参考。     

双/多基地制导雷达定位精度分析

介绍了双/多基地制导雷达五种定位方法,首先对T-R型雷达系统定位精度进行了系统仿真,然后对五种定位算法的优缺点进行分析比较。最后通过多站定位对定位性能好的两种算法进行数据融合。仿真结果表明,利用多基地制导雷达定位改善了基线附近的定位精度,使距离解算精度得到进一步提高。     

Optimal Filtering for Systems With Multiple Packet Dropouts

This paper is concerned with the optimal filtering problem for discrete-time stochastic linear systems with multiple packet dropouts, where the number of consecutive packet dropouts is limited by a known upper bound. Without resorting to state augmentation, the system is converted to one with measurement delays and a moving average (MV) colored measurement noise. An unbiased optimal filter is developed in the linear least-mean-square sense. Its solution depends on the recursion of a Riccati equation and a Lyapunov equation. A numerical example shows the effectiveness of the proposed filter.      

Normally On/Off Integrated Latching Acceleration Switch With Controlled Fracture Beams and Independent Multicontact

This letter reports an acceleration latching switch with integrated normally on/off paths. The normally on path, formed by notched beams connected in series, will be broken and latched to reach the open state when the acceleration exceeds the threshold. A multicontact is adopted for the normally off path, while both paths are mechanically separated from the proof mass to prevent them from the impact of the proof mass at the latched state. Experimental results show that the latching shock is 10 000 G, and the response time is about 0.1 ms. The normally on path has an on-state resistance of 4.0 $Omega$ and an allowable current of 200 mA, whereas the normally off path has an on-state resistance of 3.8 $Omega$ and a maximum current of 140 mA.      

次最优鲁棒调节器设计

本文介绍了一种系统参数具有有限变化的次最优鲁棒调节器设计的新方法.我们假设系统可以由一个标称矩阵集合(A_0,B_0,C_0)及对应于K个不同工作条件下的矩阵集合(A_i,B_i,C_i),i=1,2,…,K来表示,通过使用一个包含有状态变量对其标称值的增量项的推广二次型性能指标最小,来获得一个固定的输出反馈增益矩阵F;同时也介绍了一种有关最优定常输出反馈问题的大范围收敛的算法,并以一个实际的飞行控制系统说明了该固定输出反馈矩阵F是鲁棒最优的.