Fabrication and optical characterization of poly(2,5‐di‐n‐butoxyphenylene) nanofibril arrays

Anodic aluminum oxide (AAO) membrane can be used as template for the synthesized nanostructures. In this article, we have prepared the AAO membrane by using electrooxidation of aluminum substrate in phosphoric acid, and fabricated poly(2,5‐di‐n‐butoxyphenylene) (BuO–PPP) nanofibril arrays by oxidative coupling polymerization of 1,4‐di‐n‐butoxybenzene (DBB) within the pores of the AAO template membrane. The detailed molecular structure of the polymer nanofibrils was characterized by using infrared and ¹H nuclear magnetic resonance spectra, and estimated to consist of almost equal fractions of 1,4‐ and 1,3‐ linkages. We have used transmission electron microscopy, scanning electron microscopy, and atom force microscopy to confirm the morphologies and images of the AAO template membrane and the fabricated nanometer scale of BuO–PPP nanofibril arrays. The experimental results demonstrated that the pores of the AAO membrane were regular and uniform, and parallel each other, and the BuO–PPP chains in the narrowest template‐synthesized nanofibrils were oriented parallel to the porous axes of the AAO membrane and perpendicular to the surface of the aluminum substrate. The polymer chain orientation was partially responsible for the enhanced conductivity. The ultraviolet absorption spectrum of the BuO–PPP nanofibril arrays shown that the polymer contains a better extended π‐conjugation system along poly‐(p‐phenylene) backbone, which resulted in longer wavelength shift of the absorption band, the absorption maxima were located at 258 nm (E₁ absorption band) and 332 nm (E₂ absorption band), respectively. Photoluminescence spectrum of the BuO–PPP nanofibril arrays exhibited a blue emission. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 425–430, 2004     

Nanocrystalline CeO2 in SBA-15: Performance of Pt/CeO2/SBA-15 Catalyst for Water-gas-shift Reaction

CeO₂ particles confined within the pores of an SBA-15 mesoporous silica host were prepared by incipient wetness impregnation (IMP) and deposition precipitation (DP) methods. The materials were characterized by XRD, N₂-adsorption and temperature programmed reduction (TPR) to evaluate the structure, texture, and redox properties. The preparation procedure had significant impact on the assembling mode of CeO₂ inside the SBA-15 mesopores. A high dispersion of CeO₂ particles was achieved via DP, whereas the dispersion of CeO₂ prepared by IMP was found to be inhomogeneous and CeO₂ partially blocked the pores. The CO conversion in the water-gas-shift reaction was enhanced over 1 wt% Pt supported on CeO₂-modified SBA-15 obtained by DP.     

计算机远程控制的有关应用分析

通过远程控制软件介绍计算机远程控制的关键技术。在计算机普及速度加快的今天,计算机远程技术得到迅猛发展,研究计算机远程控制的应用,推动其推广和应用。本文论述计算机远程控制的应用,旨在为同行提供一些参考。     

一种基于ZigBee的分布式井盖监控系统

随着我国现代经济发展水平的不断提高,城市井盖数目逐渐增加。由于较多井盖被盗,致使路面形成陷阱,危害到过往车辆和行人安全。本文提出了一种基于ZigBee无线网络的智能安全监控系统,解决分布式布控困难、不能实时监控、成本较高的问题。融合GPRS网络,设计相应的嵌入式网关和Web服务器,实现了对缺失井盖的精确定位、自动报警功能。     

基于WiFi无线通信的温湿度检测节点设计

基于AM2303温湿度传感器、STC15F104W单片机和WiFi模块设计了一种无线温湿度检测节点。介绍了AM2303及其通信协议、WiFi模块及其组网特性等,并且给出了读取AM2303数据的软件流程。经测试,该节点通信距离远,组网灵活,可很好地应用于粮库粮情检测等实际工作环境。     

浅谈海南影视动画产业发展中的政府作为

影视动画产业是当今社会的朝阳产业,是传统经济发展和延伸的一种新方式,政府对影视动画产业十分重视.而影视文化产业具有浓厚文化色彩和广阔的自由发展空间,有利于影视动画的进一步发展与建设.影视动画产业发展对象可以是影视基地,也可以是影视剧本,产业发展对象丰富,所以此产业的发展前景非常明朗,并且还具有高度的研究价值.     

图像增强技术在安防监控系统中的应用

数字化的图像处理技术里面对于各个综合知识的跨度是相当大的,对于各个知识面的要求也是十分高的。那么图像处理技术在实际的生活应用中也是被广泛运用。随着科技时代的到来,人们对于图像的画质要求更高,所以对于图像处理技术的研发已经是整个行业必须解决的问题。那么在这样一个要求越来越高的情形下,在视频监控行业里面图像处理技术起到了那些作用？是怎么样去应用到安防监控行业里面的？本文针对这些问题作出了一些简单的讨论和研究。     

基于商业智能的小区日用水量预测模型研究

商业智能现在已广泛应用于各个领域,利用商业智能可以对趋势预测做出良好的支持,本文将其中一种常用商业智能的工具——数据仓库技术,应用于小区家庭的用水量预测研究。     

钢丝编织机噪声问题及其消音罩的设计

本文主要就用于生产高压钢丝编织胶管的设备——钢丝编织机,在运行中产生的噪声原因及治理方案进行论述,并具体介绍了消音罩的设计。     

基于IPTV的网络教学系统的设计

以IPTV技术为支持的远程教育模式具有投入少且效果好的特点,在远程教育中发挥着越来越重要的作用.利用P2P和流媒体技术为支撑,设计和实现了具有IPTV交互特点的远程教育系统.该系统包括课后练习,测试以及答疑等学习活动,实现集在线学习,游戏娱乐,生活服务于一体的互动数字化教育,并有效解决实时课堂传输中视频质量的问题.