Implementation of ZigBee Network Layer Based on AODVjr and Tree Hirarchical Route Algorisms

The basic functions and the relative concepts of ZigBee network are analyzed in this paper. The implementation method of ZigBee network layer is proposed, it includes how to build a new network, add a node to the network, send data and receive data. The distributing address assigning mechanism, the tree hierarchical route algorism and AODVjr algorism are implemented. Finally, the ZigBee network layer protocol is tested.

An Implementation Method for ZigBee Network Layer

The basic functions and the relative concepts of ZigBee network are analyzed in this paper. The implementation method of ZigBee network layer is proposed, and then a algorism about how to built a Zigbee network is defined. Finally, a experiment is simulated by prove the liveness of the Zigbee network, the result shows the PC can get the monitored data from the Zigbee network.

A Control Method for SVG Based on Differential Geometry Nonlinear Control

The control method for SVG is researched in this paper. Based on the working mechanism of SVG, the logic switch function is introduced to establish the dynamic mathematic model. A differential geometry variable control method is provided and the differential geometry linear theory is used to convert the nonlinear system to a linear system. Then based on the former work the control of SVG is devised. Finally, the control of SVG is simulated and the result shows the differential geometry nonlinear control is robust and stable comparative to the traditional PID control method and it is an effective to control the SVG.

A Effective Method for Properties Access in MAC Layer of ZigBee

The attribute access methods of MAC layer in wireless communication network is researched. Aiming at conquering the problem of the shared ZigBee wireless channel resulting multi-channel device conflicts when using the data channel at the same time, therefore the protocol is improved and a method used to access the properties of ZigBee is proposed, and this method can be achieved to manage effectively for all the 29 properties MAC layer, save storage space and realize property maintenance and expansion.

镧-钛氧簇闪烁体中无机簇核和有机配体的协同作用实现高性能X射线成像

随着对X射线成像,特别是对弯曲和不规则物体的三维成像的需求不断增加,高性能柔性闪烁膜的开发引起了人们的极大关注.镧系(Ⅲ)-有机闪烁体由于其在结构设计和光学可调谐方面的巨大灵活性,最近成为一类新的有前途的X射线闪烁体.然而,设计具有高光产额和良好溶液分散性的镧系元素(Ⅲ)-有机闪烁体仍然具有挑战性.本文报道了一种具有高效X射线激发发光(XEL)和良好溶液分散性的铕-钛氧簇合物(Eu-TiOCs)闪烁体.笼状镧-钛氧原子簇核作为X射线吸收剂,产生高能电子并引发二次电子热弛豫.有机配体作为能量转移桥和天线,通过级联能量转移来敏化Ln^(3+);离子的发光.Eu-TiOCs闪烁体表现出高的稳态X射线光产额(高达26,816±2000 photons MeV^(-1)).此外,EuTiOCs闪烁体和聚合物的羟基之间的弱氢键相互作用增强了Eu-TiOCs的溶液分散性,有利于制备低光散射和均匀闪烁膜.铕-钛氧簇与聚合物之间的通过无机簇笼和有机配体之间的协同作用,所得到的柔性闪烁膜对平面和非平面物体都表现出的高空间分辨率和低剂量X射线成像.本工作为进一步设计和制备高性能X射线闪烁体和高分辨率柔性闪烁膜提供了新思路.