Synthesis and surface properties of polydimethylsiloxane‐based block copolymers: poly[dimethylsiloxane‐block‐ (ethyl methacrylate)] and poly[dimethylsiloxane‐block‐(hydroxyethyl methacrylate)]

A polydimethylsiloxane (PDMS) macroazoinitiator was synthesized from bis(hydroxyalkyl)‐terminated PDMS and 4,4′‐azobis‐4‐cyanopentanoic acid by a condensation reaction. The bifunctional macroinitiator was used for the block copolymerization of ethyl methacrylate (EMA) and 2‐(trimethylsilyloxy)ethyl methacrylate (TMSHEMA) monomers. The poly(DMS‐block‐EMA) and poly(DMS‐block‐TMSHEMA) copolymers thus obtained were characterized using Fourier transform infrared and ¹H NMR spectroscopy and differential scanning calorimetry. After the deprotection of trimethylsilyl groups, poly(DMS‐block‐HEMA) and poly(DMS‐block‐EMA) copolymer film surfaces were analysed using scanning electron microscopy and X‐ray photoelectron spectroscopy. The effects of the PDMS concentration in the copolymers on both air and glass sides of films were examined. The PDMS segments oriented and moved to the glass side in poly(DMS‐block‐EMA) copolymer film while orientation to the air side became evident with increasing DMS content in poly(DMS‐block‐HEMA) copolymer film. The block copolymerization technique described here is a versatile and economic method and is also applicable to a wide range of monomers. The copolymers obtained have phase‐separated morphologies and the effects of DMS segments on copolymer film surfaces are different at the glass and air sides. Copyright © 2010 Society of Chemical Industry     

90年代电网自动化的发展方向

根据３０年来电网自动化的发展历史及９０年代电网ＥＭＳ／ＤＭＳ的发展动向，结合当前在计算机技术和电力系统分析算法方面的发展，提出了９０年代电网的自动化将从传统的调度自动化向广义的调度功能一体化以至全电力公司的综合自动化方向发展。文中对９０年代电网自动化系统的构成平台及开放式分布式体系结构、特别是针对电网ＥＭＳ／ＤＭＳ的基础——分布式技术软件的构成问题进行了讨论。     

配电管理系统当前的国际状况

配电管理系统(DMS)目前在北美是个热门课题，但并没有一个功能及构成的明确定义 。该文介绍了目前在北美市场上与DMS有关的计算机应用的功能及其技术特点，包括自动 地图/设施管理/地理信息系统、掉电管理/电话热线、工作单/操作票管理系统、维修人员管 理、配电网络组态等配电网应用软件，以及DMS面临的集成问题。     

浅析城网建设和改造中的配电自动化

首先阐述了与配电自动化和变电站自动化有关的几个名词术语的概念和含义。根据城网 特点,分析了国内现状,指出在近期城网建设和改造中,不宜大量采用配电管理系统（ＤＭＳ）,在有条件的地区可先上配电自动化系统,包括变电站自动化和馈电线自动化。要做好规划,进行技术经济比较,注意效益,讲究实用。     

基于Smallworld的配电AM/FM/GIS分布式系统

随着我国城网改造的逐步升温,配电管理系统（DMS）成为提高配电网运行和管理水平必不可少的手段,而AM／FM／GIS系统是配电系统整体管理水平提高的集中表现之一。本文围绕电力AM／FM／GIS系统的设计、功能规划,接口方案、一体化设计思想等问题进行了深入的探讨。     

Mössbauer studies and magnetic properties of SnO2 doped with Fe

Transparent conducting SnO₂ powders doped with 10% Fe content were prepared by a polymerized complex method under acidic solutions, and annealed finally at 550 °C, and at 600 °C. These samples were characterized by X-ray diffraction, magnetization, and Mössbauer spectrometry at room temperature. Rutile SnO₂ phase was obtained for both samples, and the crystallite sizes were in the range of 13-14 nm. Both samples exhibit magnetization and the saturation magnetization was smaller for the sample annealed at 600 °C than for sample annealed at 550 °C. Room temperature Mössbauer spectra for both samples showed the presence of two different paramagnetic iron sites but no magnetic sextets. These results suggest that ferromagnetism originates from magnetic defects and not directly from iron ions.     

ECR-PEMOCVD技术生长的GaMnN薄膜的特性

利用电子回旋共振-等离子体增强金属有机物化学气相沉积(ECR-PEMOCVD)技术,在蓝宝石(α-Al2O3)衬底上生长出具有一定Mn含量的GaMnN稀磁半导体薄膜.RHEED图像呈现清晰的斑点状点阵,表明薄膜为单晶,表面不是很平整,为三维岛状生长模式.X射线衍射分析表明薄膜为六方结构,沿c轴方向生长,结晶性良好.AFM显示薄膜是由许多亚微米量级的晶粒按一致的取向规则堆砌而成的.超导量子干涉仪(SQUID)测量显示在室温下薄膜依然具有铁磁性,居里温度约为400K.     

基于TRSAPI科技情报管理系统

本文简要介绍了TRS中英文信息发布检索平台，对以C＋Builder 3.0为前端开发工具的TRS API7编程做了详细说明。根据大庆油田科技情报管理的需要，以TRS作为数据库存管理系统，设计并实现了一个科技情报服务系统。     

泥炭生物过滤器去除甲硫醚的微生物学研究

研究了泥炭和接种活性污泥的泥炭作为填料的生物过滤器去除甲硫醚（DMS）恶臭气体的情况，确定了生物过滤器中降解DMS的优势微生物种群，填料是原始泥炭的生物过滤器几乎不能去除DMS，接种活性污泥的泥炭生物过滤器则能有效地去除低浓度DMS气体。去除DMS适宜的pH值范围是7－5．45。微生物学分析表明，生物过滤器中去除DMS的优势种群是来源于活性污泥的非嗜酸化能自养型硫氧化菌。     

色散控制孤子系统的应用设计研究

对色散控制孤子(DMS)系统的设计展开研究,首次通过DMS系统的传输理论研究系统参数受限度,确定DMS传输系统的参数以及系统设计步骤,然后研究将DMS传输系统应用于一段实际的干线网络。作为优化设计DMS系统传输参数的例子,改建后的干线网的传输特性和眼图性能良好,基本上能得到理想的结果。为色散管理孤子方案应用于实际系统提供有价值的参考,为升级传统光纤线路,实现高速大容量传输提供有益的参考。