井筒套管对井间电磁成像测井信号传输的影响

通过模拟柱状三层介质中电磁波传播特性,得到了井筒套管对井间传输的电磁信号的影响。将发射天线看作位于无限长圆柱形井筒套管中央的垂直磁偶极子,井筒套管内外是分布均匀的柱状三层介质,把电磁场用磁赫兹矢量位表示,推导了各个区域的电磁场积分表达式,利用数值积分计算了不同情况下的电磁场分布,分析了井筒套管电导率(材料)、厚度及测井工作频率对井间电磁成像测井信号的影响。     

新媒体服务系统及其相关支撑技术

从新媒体的概念出发,针对新媒体的对等交互、数字化分布特征,阐述了新媒体服务系统的基本功能和构成要素.然后面向新媒体的需求和发展趋势,重点从新媒体服务系统软件体系架构、新媒体服务组合、数字权益管理、数字水印、信任管理等几个新媒体服务系统关键支撑技术研究的主要内容和热点问题展开了讨论.     

联机手写公式中字符的切分与识别

提出了联机手写字符切分算法.通过基于规则的笔划合并和笔划块切分将笔划合并成字符块,在此基础上,采用动态规划算法,利用字符块的间距、外接框重叠信息、笔划复杂度以及字符识别信息,寻找出最优的切分路径.实验证明,算法对于一维简单数学公式和二维复杂数学公式的切分都有着比较好的效果.     

磷锑共掺SnO2陶瓷的电阻-温度特性

采用湿化学法制备了磷锑共掺氧化锡Sn1-3xSbxP2xO2+6(x=0.004,0.010,0.030,0.050)材料.利用XRD、SEM、电阻-温度特性测试系统和交流阻抗技术对所制氧化锡材料的物相组成、微观结构及导电特性进行了研究.结果表明:在x=0.004和0.010时,所制氧化锡材料由纯四方结晶相组成,但在x≥0.030时,材料中出现了微量的P2O5和SnP2O7杂质相;所制氧化锡材料的电阻-温度特性具有负温度系数(NTC)效应,选主要是晶粒效应和晶界效应共同作用的结果;最后利用能带理论对该材料的NTC导电机理进行了分析讨论.     

Squaraine Dyes for Photovoltaic and Biomedical Applications

Squaraine dyes (SQs) are an important class of polymethine dyes with a unique reasonable-stabilized zwitterionic structure, in which electrons are highly delocalized over the conjugated bridge. These dyes can not only be easily synthesized via a condensation, but also exhibit intense absorption and emission in the visible and near-infrared region with excellent photochemical stability, making them attractive material candidates for many photoelectric and biomedical applications. Thus, in this review, after an introduction of SQs, the recent advances of SQs in the photovoltaic field are comprehensively summarized including dye-sensitized solar cells, organic solar cells, and perovskite solar cells. Then, the important advances in the use of SQs as the biosensors, biological imaging, and photodynamic/photothermal therapy reagents in the biomedical field are also discussed. Finally, a summary and outlook will be provided with some new perspectives for the future design of SQs.     

Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics

Wide bandgap polymer D18 with narrow photon harvesting in visible light range and small molecule N3 with near-infrared photon harvesting are adopted for building semitransparent organic photovoltaics (OPVs). To find out the optimal D18:N3 weight ratio for semitransparent OPVs, series of opaque OPVs are built with a varied D18:N3 weight ratio. The power conversion efficiency (PCE) and fill factor can be maintained over 16% and 77% in the D18:N3 (0.7:1.6, wt/wt) based opaque OPVs, respectively. The average visible transmittance (AVT) of the corresponding blend films can be achieved over 50%, demonstrating the great potential in fabricating efficient semitransparent OPVs. The semitransparent OPVs based on D18:N3 (0.7:1.6, wt/wt) are fabricated by using 1 nm Au/(10, 15, 20 nm) Ag as cathode. The thickness of Ag layers is varied to balance the optical properties and electrical properties of semitransparent top electrode. The semitransparent OPVs with 10 nm Ag achieve the highest light utilization efficiency of 2.90% with a PCE of 12.91% and an AVT of 22.49%, which should be among the best performance of reported semitransparent OPVs. This work demonstrates that the wide bandgap polymer donor with narrow photon harvesting in visible light range has great potential in preparing efficient semitransparent OPVs.     

基于边信道原子的椭圆曲线标量乘算法

提出了一种能够抵抗简单能量分析攻击的边信道原子结构,减少了椭圆曲线密码体制中标量乘的倍点和点加运算次数,从而节省了运算时间,最后通过调用Crypto++库函数,对于NIST提供的160 bit素域上椭圆曲线编程实现算法,发现此算法的效率比Montgomery Ladder算法提高了37.6%。     

基于Android的药品使用禁忌查询系统的设计与实现

基于移动终端的软件由于使用方便,越来越被人们所接受.开发和设计一个基于Android的药品使用禁忌查询系统,可以使医务工作者在临床工作中,非常方便和快捷地查询药品的适应症、使用剂量及方法、禁忌配伍等信息,解决了临床医务工作者在实际工作中遇到的一个重要难题,有效提高了医务工作者的工作效率.     

Laser diffraction from capillary waves on liquid film surfaces

A simple experiment for laser diffraction of capillary waves on liquid film surface (LFS) is realized. Steady and visible diffraction patterns are obtained. The dispersion relation of capillary waves on LFS is verified by laser diffraction. In particular, both the relation between the wave number and the film thickness at a fixed angular frequency and the relation between the angular frequency and the wave number at a fixed film thickness are investigated. The theoretical and experimental results are in good agreement.