Nanocomposite Films of V_2O_5-MoO_3 Xerogel with Poly Ethylene Oxide Intercalation

1　IntroductionItiswell establishedthatsomeinorganiclayeredcompoundssuchasMoO3 ,V2 O5canbeintercalatedbyavarietyofalkaliions (Li+ ,Na+ ,etc .) ,atomsandlargermoleculestoformintercalationhost guestcompounds ,whichareexpectedtobeusedaspotentialcathodicmate rialsinsecondaryLibatteriesandelectrochromicdevice s[1] .Thepolymer layeredoxidenanocompositeshaveat tractedmuchattentionduetotheirspecialstructureaswellassuperiorelectrical,electrochemicalandopticalproperties .Recently ,nanocompositesof (P…     

Nanocomposite films of V<Subscript>2</Subscript>O<Subscript>5</Subscript>−MoO<Subscript>3</Subscript> xerogel with poly ethylene oxide intercalation

Poly ethylene oxide (PEO)_x−V₂O₅−V₂O₅−MoO₃ (x=0, 0.5, 1) films were prepared by the sol-gel method. The synthesis and structure of the films were investigated by XRD, TG-DTA, FTIR, etc. The results show that V₂O₅−MoO₃ xerogel has a layered structure and its interlayer space increased from 1.3181 nm at x=0 to 1. 7898 nm at x=1 after the nanocomposite films were dried, and PEO in the interlayer changes the interface structure by forming hydrogen bonds with V=0 bands. CV measurement indicates that the intercalation of PEO improves insertion/extration properties of Li⁺ ions in the interlayer. ZHENG Jin-xia: Born in 1976 Funded by the National Natural Science Foundation of China (No. 50172036) and Natural Science Foundation of Hubei Province(No. 2001ABB083)     

水位远程监测系统通信软件的设计

本文介绍了基于电话网的水位远程监测系统的整体设计方案，以及基于C^ Builder的系统通信软件，本系统成功地应用于苏北某市运河水位监测系统。     

砂岩型铀矿弱信息提取及综合评价方法技术研究

砂岩型铀矿弱信息提取及综合评价技术是当前铀矿勘查中的重要研究内容之一。通过近几年的研究，提出了航磁、航放弱信息提取的内涵，研究了航磁、航放弱信息形成理论，建立了有效的弱信息提取数学模型；基于GIS软件，实现了弱信息提取模型，并开发了专家打分综合评价模型。在某地区，应用GIS软件完成了航磁、航放弱信息提取试验和铀资源综合评价。研究结果表明，弱信息提取和综合评价技术可快速缩小砂岩型铀矿找矿靶区，提高预测精度。     

聚合物修饰V2O5纳米复合薄膜的性能研究

近年来,利用能与锂等碱金属离子发生拓扑化学反应的V2O5、MoO3等层状氧化物的层间结构特征,将聚合物嵌入层间对其进行修饰来改善界面和层间性质,使材料呈现出许多优异的性能,对这类材料合成、结构、性能和界面行为的研究引起了人们的极大兴趣.本文采用通氧气气氛下熔融淬冷法制备V2O5溶胶,采用聚合物溶液直接嵌入的方法,用PEO(聚氧化乙烯)对V2O5层间进行修饰制成(PEO)0.5V2O5·nH2O纳米复合薄膜,并通过直流电导率测试、循环伏安法、紫外-可见光吸光光谱对其电学、电化学、光学性能进行了研究.结果表明,PEO的修饰使V2O5干凝胶薄膜的电学、电化学、光学性能都发生了较大的变化.     

有限带宽网络多媒体传输的自适应QOS控制

介绍一种基于有限带宽网络的多媒体传输服务质量(QOS)解决方案。该方案采用增强的自适应QOS算法，可实现发送端与接收端速率的协调控制、多量化参数(QP)速率形成和自适应前向纠错(FEC)。基于标准MPEG-2编码解码方法进行比较实验，结果表明采取该算法不但可以令峰值信噪比(PSNR)减少抖动，而且平均性能提高0．5dB。     

产品数据管理(PDM)技术及其应用

文章简单介绍了产品数据管理 (PDM )技术的概念和基本功能 ,强调PDM是实施企业信息化的重要技术 ,能有效地提高企业的市场竞争能力。     

柴油加氢反应器缺陷原因及安全性分析

通过对反应器主焊缝外壁产生的裂纹成因分析，为板式反应器的制造、使用提供借鉴。     

Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak

Several results based on the Langmuir probes' data on the HL-2A tokamak are presented. The blob structures' radial and poloidal drift velocities, estimated by the gradient of floating potential and by time delay evaluation, are compared in different line-averaged density and electron cyclotron resonance heating conditions. A positive correlation is observed in the comparison between blobs' radial velocity estimated by the two methods mentioned above, regardless of the situation differences mentioned above. Correlation is also observed in the comparison between the blobs' poloidal velocity estimated by the two methods in different situations, while a shift due to the different line-averaged density is observed. These results imply that the radial gradient of floating potential may have some value as a reference during data analysis in low-parameter discharge.     

一种纸箱级RFID仓储系统设计及实现

针对目前仑储系统中货箱级RFID解决方案无法满足以小型货物为主的纸箱级仓储系统需求,提出一套可有效利用RFID技术以提高纸箱级仓储工作效率的解决方案.方案在固定式读写器的基础上加上了手持终端的RFID读写器,并且设计了相关的工作流程.经过控制中心的协调和调度,固定式读写器和手持终端读写器相互配合工作,完成入库、出库和盘点这三个仓储基本操作.