Tuning of the periodicity of stable self-organized metallic templates

The atomic and electronic structures of Pb bilayer/Pt(111) are investigated with two theoretical calculations.We find that the stable (2 × 2)/(3 × 3) Pb/Pt(111) structure is a promising candidate for being used as a template with self-organized ordered Pb semi-cluster array on the first Pb monolayer.This stable structure can realize the ordered Au single-atom array around the Pb semi-clusters that can cause selective adsorption of noble atoms.The size of Pb magic number semi-cluster plays a more important role in determining the periodicity of the template than the lattice constant misfit between the substrate and the overlayer.This leads to quite a different periodicity between the two stable templates,which are (2 × 2)/(3 × 3) Pb/Pt(111) and Pb/Cu(111).Therefore,by considering the size of the stable semi-clusters and carefully selecting different substrate materials,we can tune the density of Pb semi-clusters as the nucleation points and then tune the periodicity of the stable template.     

Adaptive local routing strategy on a scale-free network

Due to the heterogeneity of the structure on a scale-free network, making the betweennesses of all nodes become homogeneous by reassigning the weights of nodes or edges is very difficult. In order to take advantage of the important effect of high degree nodes on the shortest path communication and preferentially deliver packets by them to increase the probability to destination, an adaptive local routing strategy on a scale-free network is proposed, in which the node adjusts the forwarding probability with the dynamical traffic load (packet queue length) and the degree distribution of neighbouring nodes. The critical queue length of a node is set to be proportional to its degree, and the node with high degree has a larger critical queue length to store and forward more packets. When the queue length of a high degree node is shorter than its critical queue length, it has a higher probability to forward packets. After higher degree nodes are saturated (whose queue lengths are longer than their critical queue lengths), more packets will be delivered by the lower degree nodes around them. The adaptive local routing strategy increases the probability of a packet finding its destination quickly, and improves the transmission capacity on the scale-free network by reducing routing hops. The simulation results show that the transmission capacity of the adaptive local routing strategy is larger than that of three previous local routing strategies.     

一种无标度网络上的局部路由策略

提出了一种无标度（scale-free）网络上的局部路由策略。每个节点根据其当前负载与自身发送能力（设为等于节点度）的关系,自适应调整其接收邻居节点信息包的概率。此概率与每个节点度的α次方成正比,α是可自适应变化的偏好因子,由节点度以及负载联合决定。当节点负载小于发送能力时,增大其偏好因子;反之,则减小。这样使得整个网络业务量较小时,可以优先把业务转发往度较大的节点,从而更快到达目的地;而业务量较大时,度大以及度小节点的发送能力均能得到充分利用,从而提高了整个网络的业务承载能力。仿真结果表明,该策略有效地提高了网络容量,并且降低了网络中信息包的平均传输时延。     

构建反制激光红外制导武器的陆域防御体系思考

现代战争中无论是有人、无人协同作战的空袭兵器,或是无人机搭载的制导武器,始终对交战方重要军事目标和武装力量构成严重的空中威胁,并且随着其精确制导武器性能的提高、攻击样式和战役战术的变化,基于陆域的防空武器系统发现、搜索、跟踪和抗击相关有人、无人空袭兵器遭到极大障碍,必须对基于激光红外制导武器的陆域防御系统予以加强和重视,防范激光制导、电视/红外成像制导、雷达制导等精确制导武器以及复合制导的精确制导武器已成为陆域防御系统的主要作战对象和典型场景。本文首先对战争形态快速演变下陆战特点进行分析,针对外军精确制导武器发展规划和技术改进对陆地防御提出的挑战,构设了新型作战形态下基于激光红外制导武器的陆域防御系统概念,介绍了系统基本组成、功能和作战流程,为相关防御体系的建设和发展提供理论支撑和参考借鉴。     

有机智能传感材料与器件研究进展

有机光电子材料具有柔性、低成本、可大面积加工以及分子结构可调等特点,在可穿戴智能器件领域具有巨大的应用潜力.有机分子可以通过结构的设计调节其光学、电学、机械和化学等特性,从而实现丰富的传感功能.有机智能传感器具有快速响应、高选择性、高灵敏和机械柔性等优势,被广泛应用于环境监测、电子皮肤、医疗监测、人机交互等智能感知领域.本文综述了近年来有机智能传感材料与器件的研究进展,包括小分子半导体、聚合物半导体和导电聚合物等有机传感材料,以及化学传感器、温度传感器、光学传感器和机械传感器等有机智能传感器件的前沿应用,重点介绍了目前生物传感器、仿生传感器等智能感知器件和系统的发展现状,并对其未来发展过程中面临的挑战进行了分析.     

战术激光武器陆战场运用思考

新时代条件下陆军防空任务正在受到新型远程无人武器的巨大挑战,传统远中近程防空武器系统亟需进行变革性重组和加入新型防空力量,战术激光武器的发展运用由此孕育而生。本文提出了战术激光武器的主要特征,研探了其主要任务清单和效能,分析了战术激光武器在陆战场中实际运用方式,总结了其战场实际需求和发展。     

国产有机硅三防涂料性能对比验证

对DC1-2577和三种国内自主研制的有机硅敷形涂料的基本性质、电性能和防护性能进行了对比测试验证。结果表明：涂覆后的样件均能通过240 h中性盐雾试验、10周期耐湿试验和50周期温冲试验，霉菌等级达到1级（7种），绝缘电阻和介质耐电压性能均能达到SJ 20671-1998《印制板组装件涂覆用电具有化合物》的要求，但是在加严条件下，其中两种自主研制的涂料的介质耐电压值与DC1-2577性能相当，另外一种略差于DC1-2577。