全光纤光子集成器件及系统

本对全光纤光子集成器件与系统进行了较为全面地综述,结合我们的工作,对目前的研究热点：光纤光栅,光纤激光器,光纤放大器,光纤光栅分插器与传感器等诸多光子器件以及由这些器件组成的波分复用通信系统进行了介绍和评述,一些新成果和新进展表明,这些光子器件与系统在当今和未来的光通信中将发挥重要作用。     

多节摆的自由振动分析

利用拉格朗日方程,导出了多节摆系统的运动微分方程.根据三对角阵的性质,给出了振动系统的特征多项式和特征矢量的递推公式,并以三节摆为例,说明了结果的应用,用此方法验证了<力学与实践>2002年第24期<多自由度振动系统的简正坐标和简正振动模式>一文中的结果.     

液晶分子印迹整体柱的制备及其分子识别热力学

液晶分子印迹聚合物(MIPs)因刚性液晶单体的加入而在超低交联度水平下也能印迹和识别模板分子,有效解决了传统MIPs因高交联度造成的位点包埋、结合容量低、传质慢等问题.尽管液晶MIPs具有如此独特的优势,但却面临着由于交联度的大幅度降低而导致印迹效果下降的问题.为了研究液晶MIPs的结合特性,制备具有良好印迹效果的低交...     

Effect of graft polymer prepared by living radical polymerisation on electro-optical properties of polymer dispersed liquid crystal

In this study, a graft polymer matrix prepared by living radical polymerisation had been incorporated into polymer dispersed liquid crystals (PDLCs). The electro-optical properties of the PDLCs were investigated. The results showed that the length and density of graft chain had a great influence on the memory effect of the PDLCs. Low-driving-voltage and weak-memory-effect PDLCs could easily be obtained with a graft polymer matrix.     

EDTA-甘氨酸联合法制备LaAlO3基电解质材料及其电性能

采用EDTA-甘氨酸联合法(EGCP)合成具有钙钛矿结构的La0.90Sr0.10Al0.97Mg0.03O3-δ(LSAM)粉体。采用TG-DSC,XRD,ICP-OES和TEM对粉体进行表征。在750℃下,无定形结构的粉末直接转化为钙钛矿结构的LSAM粉体。经1000℃煅烧3 h后的粉体,团聚程度低,粒径分布均匀,平均粒径约为77 nm,具有良好的烧结性能。通过SEM对材料的显微结构进行观察并分析其对电性能的影响。采用直流四电极法在空气中测定材料的总电导率,在800℃时,EGCP合成的LSAM电解质的总电导率为1.50×10-2S.cm-1,比固相法的高47.1%。     

Three‐unit semicircles curve: A compact 3D graphical representation of DNA sequences based on classifications of nucleotides

A new three‐dimensional graphical representation of DNA sequences, three‐unit semicircles (TUS)‐curve, which maps a given sequence into a dot sequences embedded in three‐unit semicircles, is proposed based on three biclassifications of nucleotides. TUS‐curve has the merit of compactness and could avoid the degeneracy and loss of information. The geometrical center of the curve, which indicates the distribution of base frequencies of the corresponding DNA sequence, is extracted and applied to analyze the similarity of various species. Phylogenetic tree of 11 species based on their first exons of β‐globin genes showed that the TUS‐curve is a powerful tool to get valuable biological information. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2011