Coverability of Wireless Sensor Networks

The coverability of Wireless Sensor Networks (WSNs) is essentially a Quality of Service (QoS) problem that measures how well the monitored area is covered by one or more sensor nodes.The coverability of WSNs was examined by combining existing computational geometry techniques such as the Voronoi diagram and Delaunay triangulation with graph theoretical algorithmic techniques.Three new evaluation algorithms,known as CRM (Comprehensive Risk Minimization),TWS (Threshold Weight Shortest path),and CSM (Comprehen...     

Distributed Dynamic Navigation for Sensor Networks

Navigation with sensor networks has shown many advantages and great potential in many scenarios.Previous works have mainly focused on selecting the shortest path to navigate an internal user out of an emergency field.However,they did not consider variations of the dangerous areas which usually occur in practical applications.This paper presents an efficient dynamic routing algorithm to successfully guide users to the destination exit.The navigation goal is looking for a safe and short path to enable the user to escape from a dangerous area as fast as possible.Without knowing the locations of the nodes,the user is guided by a sequence of sensor nodes to pass through the dangerous areas.The algorithm ensures the navigation path security by predicting the dynamic changes affecting the navigation path.The performance of this approach is evaluated using extensive simulations to validate its effectiveness.Simulations show that the approach is scalable and performs well in various settings.     

Effects of the Water in Mixed Solvent on the Epoxidation Reaction of Propylene with TS-1 Catalyst

The epoxidation reaction of propylene and hydrogen peroxide with zeolite catalyst containing titanium-silicalite (TS-1)has been studied, and the reaction in the mixed solvent of water/methanol has been discussed. It is shown that the selective of epoxidation propylene decreases while the selective of propylene glycol increases, when the water content increases in the mixed solvent of me thanol/water.     

移动通信信号到达时间差定位的估计

到达时间差(TimeDifferenceofArrival,TDOA)位置估计是无线定位的一项关键技术.首先介绍了TDOA定位估计原理,阐述了基站任意分布时(以三基站为例)的二维定位估计,以及在特殊情况下,即基站线性分布时的定位估计.最后,对三基站TDOA定位估计及其定位精度进行了仿真,为第三代移动通信无线定位系统的研究和开发提供了理论基础.     

福建省青少年游泳运动员比赛表现的影响因素探析

采用文献资料法、问卷调查法、数理统计法,对影响福建省青少年游泳运动员比赛表现的影响因素进行研究。经过对34个因素进行因子分析,得出影响运动员比赛表现的影响因素的9个主因子。对9大因子进行分析得知,运动员比赛表现是个人技战术水平、心理能力、客观环境、人为因素、赛前准备、教练信任、对手作用、最佳体验与自我评价等多方面因素影响的结果,为我国游泳运动员训练和赛前控制比赛状态提供理论参考。     

用无波函数微扰论和Padè近似方法计算双原子分子振动能级

本文不仅利用无波函数微扰论推导出了双原子分子的非谐振动能级的理论公式，而且还利用双变量 Ｐａｄè近似对 Ｈ Ｃｌ３５ 分子的振动能级做了具体的数值计算，通过选取适当的势参数，理论计算值和实验结果符合得很好     

嘧啶氧磷毒性和解毒试验研究

本文报道了嘧啶氧磷的急性经口，经皮毒性和解毒试验研究结果。嘧啶氧磷对小白鼠经口ＬＤ５０为８７ｍｇ／ｋｇ，大白鼠经口ＬＤ５０为１８３ｍｇ／ｋｇ，大白鼠经皮ＬＤ５０为１０６２ｍｇ／ｋｇ，氯磷定对嘧啶氧磷中毒有良好的解毒效果。     

含SDG对的费米子动力学对称性模型

在含ＳＤＧ对的费米子动力学对称性模型的框架下，对原子核的十六极振动自由度给出了一种新的描述，并计算了元素１３２Ｔｅ的低激发能谱和Ｅ（２）跃迁几率计算结果表明，十六极振动自由度对原子核集体运动有重要的影响     

管道输油投入产出模型的建立

本文介绍了了管道输油投入产出模型的构成；总量平衡关系；以及计算输油系数，总周转量，有效周转量和油效率的方法。