炭/炭复合材料用高性能浸渍剂沥青的研究

根据原生QI杂质由微米级炭粒构成的特性,采用溶剂絮凝法对煤焦油进行了净化处理,以净化煤焦油为原料制备了低QI含量的高性能浸渍剂沥青,对比研究了高性能浸渍剂沥青的流变性能和渗透性能。结果证实:高性能浸渍剂沥青极大地改善了浸渍效果,并且使炭/炭复合材料的力学性能显著提高。     

在计算机围棋中形象思维的研究

在计算机围棋中形象思维的研究王鲁明戴汝为（中科院自动化所人工智能实验室北京１０００８０）关键词人工智能,计算机围棋,形象思维,神经网络１）自然科学基金资助项目．收稿日期１９９５－０６－０１１引言目前,对于计算机围棋,无论是基于博弈论的方法,还是基于传...     

浸渍剂沥青QI测定的研究

在分析国内外浸渍剂沥青QI测定标准的基础上，对比研究了中国煤沥青QI测试标准对浸渍剂沥青QI测定的适用性，结果发现中国测试标准存在很多问题，分析了造成这些差异的原因，并对制定中国浸渍剂沥青QI测试标准提出了建议。     

石油沥青合成低软化点、高残炭沥青树脂

两种石油沥青在低温下合成沥青树脂，考察了工艺参数和原料组成对沥青树脂性能的影响。结果表明，大庆石油沥青反应活性适中、含胶质—沥青质较少，可以合成具有软化点(SP)为80～112C、残炭(CY)为59．13％、β树脂(TI～PS)含量为21．19％、喹啉不溶物(QI)值为1．32％、灰分为0．02％的优质沥青树脂，该沥青树脂已能够满足作为浸渍剂的要求。     

Structures of insoluble carbon in tars and pitches

Primary or True QIs, and also the so-called ‘dirt’ were separated from seven tar sources available in Canada from four different steel companies, by filtering hot tar solution of quinoline and other good solvents. After washing with quinoline and acetone and drying, the filter cake was examined under scanning electron microscope (SEM) and analysed for inorganic impurities by wave length and energy dispersive X-ray spectrometers. A limited amount of work was carried out on a production pitch blend, utilizing optical microscopy. After the filtration process, the filtrates which represented the QI free tars were subjected to distillation at atmospheric pressure and various pitches were prepared with a softening point range of 70–100°C. The pitches were dissolved in quinoline and analysed for QIs. The small amount of QI from each pitch was extracted and dispersed with solvent onto a microscope slide. The samples then were subjected to SEM and in one case to optical microscope studies; the sizes and shapes of the QIs were determined and compared with the QIs originally found in the individual tars. Photographs have been taken during the scanning work to record findings which have been considered typical and demonstrative of the findings. In order to gather further information on the role of QI in tars and pitches, particle size distribution was determined of QI extracted from a tar and a production pitch by a Coulter Counter.     

Compensation of quadrature imbalance in an optical coherent OQPSK receiver in presence of frequency offset

In this paper,we describe the impact of quadrature imbalance (QI) in the presence of frequency offset in an optical coherent offset quadrature phase shift keying (OQPSK) receiver.Arbitrary conjugate misalignment was realized in a 2×4 90° optical hybrid,and the ellipse correction (EC) method of quadrature imbalance was applied in our simulation.In the case of transmission,the EC method can significantly improve the system performance.     

沥青基C／C复合材料氧化性能影响因素分析

综述了影响沥青基C／C复合材料氧化性能的一些宏观和微观因素及交互作用。分析表明：沥青浸渍剂的组分与性能及热处理温度影响沥青基C／C复合材料的宏观结构和微观结构,使复合材料具有不同的抗氧化性能;不同类型与织构的纤维其抗氧化性能也不相同,亦影响C／C复合材料抗氧化性能。     

基于电磁感应原理的手机无线充电技术设计应用

本文设计依据电磁感应原理出发,采用IP6808芯片设计了一款电磁感应耦合式的无线手机充电电路,实现了电能的无线传输,传输效率可以达到80%。本设计电路主要由桥式整流电路、滤波电路、高频逆变电路、LC谐振电路、整流变换电路、恒压充电电路、发射线圈和接收线圈等相关电路构成。