A Molecular‐Cage Strategy Enabling Efficient Chemisorption–Electrocatalytic Interface in Nanostructured Li2S Cathode for Li Metal‐Free Rechargeable Cells with High Energy

Using high‐capacity and metallic Li‐free lithium sulfide (Li₂S) cathodes offers an alternative solution to address serious safety risks and performance decay caused by uncontrolled dendrite hazards of Li metal anodes in next‐generation Li metal batteries. Practical applications of such a cathode, however, still suffer from low redox activity, unaffordable cost, and poor processability of infusible and moisture‐sensitive Li₂S. Herein, these difficulties are addressed by developing a molecular cage–engaged strategy that enables low‐cost production and interfacial engineering of Li₂S cathodes for rechargeable Li₂S//Si cells. An efficient chemisorption–electrocatalytic interface is built in extremely nanostructured Li₂S cathodes by harnessing the confinement/separation effect of metal–organic molecular cages on ionic clusters of air‐stable, soluble, and low‐cost Li salt and their chemical transformation. It effectively boosts the redox activity toward Li₂S activation/dissociation and polysulfide chemisorption–conversion in Li‐S batteries, leading to low activation voltage barrier, stable cycle life of 1000 cycles, ultrafast current rate up to 8 C, and high areal capacities of Li₂S cathodes with high mass loading. Encouragingly, this highly active Li₂S cathode can be applied for constructing truly workable Li₂S//Si cells with a high specific energy of 673 Wh kg^?1 and stable performance for 200 cycles at high rates against hollow nanostructured Si anode.     

Modification of Exciton Lifetime by the Metal Cathode in Phosphorescent OLEDs,and Implications on Device Efficiency and Efficiency Roll‐off Behavior

Time resolved photoluminescence and electroluminescence measurements are used to study changes in the emission characteristics of materials typically used in phosphorescent organic light emitting devices (PhOLEDs). Studies on archetypical PhOLEDs with phosphorescent material, fac‐tris(2‐phenylpyridine) iridium (Ir(ppy)₃), show that the lifetime of triplet exciton is modified when in close proximity to a metal layer. Interactions with a metal layer ～30–100 nm away, as is typically the case in PhOLEDs, result in an increase in the spontaneous emission decay rate of triplet excitons, and causes the exciton lifetime to become shorter as the distance between the phosphorescent material and the metal becomes smaller. The phenomenon, possibly the result of the confined radiation field by the metal, affects device efficiency and efficiency roll‐off behavior. The results shed the light on phenomena affecting the efficiency behavior of PhOLEDs, and provide new insights for device design that can help enhance efficiency performance.     

多雷达空间目标协同探测任务规划研究

针对空间目标监视存在各传感器资源相互独立,预警资源得不到有效利用,导致空间目标探测时长不够、探测精度低等问题,提出了一种多雷达空间目标协同探测的任务规划方法,综合利用多个雷达传感器资源对空间目标进行协同探测,最终达到在短时间内累积足够的多圈有效探测数据进行协同探测的目的。文中通过对任务目标分析、资源编组、可探测性分析、弧段筛选分配等关键性技术进行分析,具体阐述了解决问题的方法。该任务规划方法在解决上述空间目标探测问题的同时可以大大节省雷达资源。     

Research on adaptive dual task offloading decision algorithm for parking space recommendation service

In order to improve the efficiency of tasks processing and reduce the energy consumption of new energy vehicle (NEV), an adaptive dual task offloading decision-making scheme for Internet of vehicles is proposed based on information-assisted service of road side units (RSUs) and task offloading theory. Taking the roadside parking space recommendation service as the specific application Scenario, the task offloading model is built and a hierarchical self-organizing network model is constructed, which utilizes the computing power sharing among nodes, RSUs and mobile edge computing (MEC) servers. The task scheduling is performed through the adaptive task offloading decision algorithm, which helps to realize the available parking space recommendation service which is energy-saving and environmental-friendly. Compared with these traditional task offloading decisions, the proposed scheme takes less time and less energy in the whole process of tasks. Simulation results testified the effectiveness of the proposed scheme.     

移动自组织网络中能源信息熵的需求多路径路由协议(英文)

This paper provides a critical review of energy entropy theory in Mobile Ad Hoc Networks (MANETs) and proposes an Energy Entropy on Ad Hoc On-demand Distance Vector Multipath (EEAODVM) routing protocol. The essential idea of the protocol is to find every route which can minimize the node residual energy in the process of selecting path. It balances individual node battery energy utilization and hence prolongs the entire network lifetime. The results of simulation show that, with the proposed EEAODVM routing...     

基于正反向联合TCF的序列多项式估计算法

针对高误码条件下序列高阶多项式估计算法容错性能差、计算复杂度高等问题进行研究,提出一种基于正反向联合TCF(三阶相关函数)的序列多项式估计算法。引入多项式线性相关对,分析研究TCF估计模型。针对模型缺点,将TCF估计问题转化为序列捕获问题,采用循环相关方式求解正反向联合TCF峰值位置。运用概率分析方法,分析研究正反向TCF峰值求解中各参数关系,为算法应用提供依据。仿真结果表明,该算法在误码率37%的条件下能够较好地完成17阶m序列多项式估计,且性能不受制于多项式抽头个数,计算复杂度和容错性能均优于TCF算法。     

像差对星间激光通信系统高精度对准的影响向

为了减小ATP系统的像差对对准的影响,达到提高系统的对准精度的目的,文中以星间ATP系统中的高精度对准平台为基础,分析了激光器处于轴外发射状态时需要考虑的两个位置偏移量(离轴参量h/s和偏移参量ra),提出激光器的位置状态会对像差有着一定的影响.并通过数值仿真,分别分析了在存在激光器位置偏移量时各种像差对对准精度的影响情况.结果表明激光器发射的状态明显影响着像差对对准的影响程度,适当调节激光器发射状态有利于减小像差对对准精度的影响,进而提高对准精度.     

一种快速的DS/FH混合扩频信号捕获方案及其性能分析

为了提高DS/FH混合扩频信号的捕获速度,提出了一种将DS/FH信号中三维搜索转化为二维搜索的快速捕获方案。通过对搜索过程的详细分析,推导出在单、双驻留条件下的平均捕获时间数学表达式以及高斯信道下系统的检测性能计算公式。理论推导与仿真结果表明:相对于传统的捕获方式,该方案有效地缩短了系统的平均捕获时间,具有更强的抗噪性能,适用于存在较强噪声的复杂通信环境。