通信网络设备的维护策略

通信网络设备是通信网络系统当中非常重要的组成部分,直接关系着通信网络系统的工作效果。通信网络当中不同的设备承担着不同的责任,关系着系统的安全。尤其是在信息时代,通信网络发挥着不可替代的作用。本文分析了当前通信网络维护的现状,并且提出了完善通信网络系统的策略,从而为当前加强网络通信设备维护提供理论借鉴。     

Oxidation of 2,2＇-Dihydroxy-3,3＇-di-tert-buty-5,5＇-dimethoxyl-biphenyl to 3,3＇-Di-tert-butylbiphenyl-2,5,2＇,5＇-diquinone with Copper（Ⅱ）Chloride as Catalyst：Synthesis,Structure and Spectral Properties of Diquinone

Use of free air as oxidant and copper(II)chloride as catalyst,3,3'-di-tert-butylbi-phenyl-2,5,2',5'-diquinone(BBDQ)was prepared via catalytic oxidation of 2,2'-dihydroxy-3,3'-di-tert-butyl-5,5'-dimethoxy-biphenyl(di-BHA).The yield of reaction attained 95% and the selectivity for BBDQ was 100%.The single-crystal X-ray diffraction analysis reveals that the dihedral angle between two rings(benzene rings for di-BHA and quinone rings for BBDQ)changes from 89.8 to 45.3o,indicating the steric hindrance effects of methyl disappear in the oxidation process.The crystal structures of di-BHA and BBDQ are further confirmed by their spectral characterizations.The probable mechanism for this oxidation process is also discussed.     

泊车辅助系统中的车位线自动检测与识别

针对目前泊车辅助系统中的车位线识别问题,建立了基于360°全景鸟瞰图像的全自动车位线检测与识别模型,考虑到光照对图像处理结果的影响,先对图像进行了预处理,然后采用一种基于中值的自适应Canny边缘检测技术,并通过Hough变换,再根据车位线特征的先验知识对Hough变换结果进行限制和优化,实现了车位线的识别。同时对实际采集到的图像进行验证,结果识别率达到94.2%,证明了该方法的有效性和鲁棒性。     

微波合成新型三联阳离子表面活性剂及其性能测定

以溴代十二烷和五甲基二乙烯三胺为原料,用微波辐射合成了新型三联季铵盐阳离子表面活性剂,探索了合成低聚表面活性剂的新途径,结果表明:最佳工艺条件为在98℃下,以正丙醇为溶剂,叔胺与溴代十二烷的mol比为2:5;反应8min结束.并对产物进行了化学分析、核磁共振氢谱、红外光谱表征,测定了产物水溶液的CMC值为0.06mmol/L及最低表面张力为38.4mN/m.     

基于Qt的农田信息监测系统研究与实现

为满足精细农业对田间参数和视频信息实时监测的需要,分析了田间信息监测系统需求,基于Qt、嵌入式等技术,采用带有S3C2440微处理器的ARM9嵌入式开发板、数字温度处理器DS18B20、中芯微ZC0301等设备设计实现了一套嵌入式农田信息远程监测系统,可采集农田土壤的温度、视频等数据;结合专用辅助电路共同构成集成信息采集节点,经有线网络与控制室内应用服务器的管理系统相连,实现了田间异常信息的监测和报警,为有效提高农田水、肥、药的施用效率提供科学支撑平台.     

Synthesis,Structure,Electrochemistry and Fluorescence Properties of a One-dimensional Coordination Polymer {[Cd[μ-(4,4′-dps)]_2(H_2O)_2]·(4-abs)_2(H_2O)_2}_n

A new cadmium(II) compound, {[Cd[μ-(4,4'-dps)]2(H2O)2]·(4-abs)2(H2O)2}n 1 (4,4'-dps = 4,4'-dipyridylsulfide, 4-abs = deprotonated 4-amino benzenesulfonic acid), has been synthesized and structurally characterized. It belongs to the orthorhombic system, space group Pbcn with a = 19.950(3), b = 10.6381(13), c = 18.055(2) , V = 3831.8(8) 3, Z = 4, C32H36CdN6O10S4, Mr = 905.31, F(000) = 1848, μ = 0.850 mm-1, Dc = 1.569 Mg/m3 , the final R = 0.0238 and wR = 0.0589 for 3080 observed reflections with I > 2σ(I). Complex 1 is a one-dimensional linear chain coordination polymer and the repeat unit is comprised of doubly charged cadmium complex cation, uncoordinated 4-aminobenzene sulfonate anions and water molecules. The cadmium(II) ion adopts a six-coordinate distorted octahedral geometry. Complex 1 is stabilized and linked into a three-dimensional layered structure through intermolecular O–H···O and N–H···O hydrogen bonds together with electrostatic force. The cyclic voltammograms and fluorescence spectrum of 1 were also measured. It shows one irreversible redox process and emits a very strong and sharp fluorescent band at about 341 nm.     

基于改进的基因表达式编程在重金属形态获取中的应用

本文研究了基因表达式编程在重金属形态获取中的应用问题.利用改进的基因表达式编程和Shannon信息熵方法,验证了算法的高效性,获得了重金属形态预测模型并从该模型中获取了重金属的形态知识的结果.该新模型方法还可广泛用于其他时间序列预测问题的研究.