离子凝胶反应法制备壳聚糖/N,O-羧甲基壳聚糖微球

以一氯乙酸与壳聚糖反应形成N,O-羧甲基壳聚糖两性聚电解质,分光光度法测定其等电点IEP=2．86。以此两性聚电解质与壳聚糖可以在一定条件下形成微球,光学显微镜和电子显微镜测试表明,控制两种聚电解质配比可以制备不同粒径大小的微球,而超声功率对微球粒径的影响较小。红外光谱测试表明微球中N,O-羧甲基壳聚糖羧基以羧酸根形式存在,分光光度与电导法联合测定表明两种聚电解质以离子凝胶作用形成微球,其最佳制备条件为IEP（CM-CHITOSAN）〈pH〈pKa（CS）,在此较宽的pH值范围内微球可稳定存在。     

Synthesis and Crystal Structure of a Novel Copper (II) Complex with Acetylenedicarboxylate and 2, 2′-Bipyridine

The construction of molecular-based crystalline solids using coordination polymer has become a very active research field in recent years,not only due to their intriguing structural motifs,but also due to their potential applications in optical,electronic and magnetic materials1,2.Many of the most interesting coordination polymers are based on polycarboxylate ligands,such as maleate3,malonate4,1,4-benzenedicarboxylate5,1,3,5-benzenetricar-boxylate6and1,2,4,5-benzenetetracarboxylate7,which have …     

聚苯乙烯-b-聚丙烯酸/聚苯乙烯在水中的自组装及胶束尺寸的研究

利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核;在适当的均聚物分子量和含量条件下,PS b PAA PS可以自组装形成单分散的纳米胶束;通过改变体系中均聚物PS的分子量和含量可在较大范围内调变胶束的尺寸.     

聚丙烯酸凝胶的动态行为及温敏相变

应用动态光散射技术研究了聚丙烯酸凝胶的动态行为及温敏相变．以相关长度（ξ）及扩散系数（Ｄ）表征动态行为．交联度,聚合物浓度及引发剂用量对ξ和Ｄ影响的规律是,随交联度增加,ξ和Ｄ分别减小及增大;聚合物浓度高,扩散系数大;引发剂用量增大,ξ向变小的方向发展．温敏相变的规律是,随温度升高,Ｄ增加,ξ下降,并且ξ分布范围逐渐变窄;随温度下降,因χ 诱发的微脱水收缩作用而导致相分离,出现浊度;交联度愈高,出现相分离的温度愈高．     

硫酸/草酸混酸电解液中阳极氧化法制备多孔阳极氧化铝模板

Well ordered porous anodic alumina (PAA) film was prepared on pure Al substrate using sulfuric/oxalic acid mixture as electrolyte with different ratios, the best regular PAA film with an average diameter of 45 nm was obtained using 1∶1 sulfuric/oxalic (molar concentration) mixed acid at 26 V. Addition of oxalic acid into sulfuric acid electrolyte resulted in the increase of anodizing current density, indicating a faster formation rate of PAA film. In 1∶1 sulfuric/oxalic acid electrolyte, the current density was the biggest, which illustrated that the formed barrier layer was the thinnest. Besides, addition of oxalic acid increased the stress of oxide film, accordingly changed the self-organized process of PAA film. XPS results indicate that the PAA film is mainly composed of amorphous alumina independent of oxalic acid addition.     

有机高分子中光生极化子的物理机制

有机聚合物中光生载流子（荷电极化子）产生的物理机制是一个非常重要的物理问题，但一直存在争议，文章介绍了作者对此问题的最新研究结果：荷电极化子和中性激子一样，是由光激发直接产生的，而不是激子解体的结果，其生成时间在100fs的量级．荷电极化子的量子产率约为25％，并且与激发能量无关，与实验观测的结果一致．     

汽车企业集团的准时化集中生产配送系统研究

汽车企业集团的准时化集中生产配送是供应链物流一体化的重要环节。实现汽车企业集团的准时化集中生产配送,要明确其目标,做好供应商关系、配送物流的统一运作、基础数据、信息网络、配送中心仓库作业设备的现代化和领导支持六个方面的基础工作;针对我国汽车企业集团的实际,构建准时化集中配送系统的框架及流程;在准时化集中配送系统运作上探讨了包括配送资源的整合、配送中心库区的划分、配送中心库位管理、配送中心库存管理、不同物料配送流程(、6)配送中心信息系统、物料索取系统等七个方面问题。     

一个模拟相关数据的新方法

介绍了一种产生相关数据的模拟方法.区别于以往的利用函数关系进行模拟的方法,本文主要从变量之间因子结构的相似性出发产生满足一定相关性的模拟数据.最后,通过一个例子说明了这个方法的应用.     

BESⅢ端盖TOF探测器的研制

针对BESⅢ端盖TOF的研制方案, 设计和制作了特殊构型的闪烁探测器. 研究了光电倍增管(R5924)和塑料闪烁体(BC404, BC408, EJ204)的性能. 测量了几种包装材料对单个闪烁探测器模块光收集和本征时间分辨的影响. 使用800MeV实验电子束对探测器模块的测量结果显示, 采用EJ204和BC404晶体其时间分辨小于80ps; 采用ESR材料包装可获得较大的输出信号, 提高了探测器的性能.     

Unusual Threshold Anomaly in the ^6Li＋^208Pb System

The angular distributions of elastic scattering for the ^6Li ＋^208Pb system have been measured at several energies around the Coulomb barrier. The parameters of optical potential are extracted by means of a phenomenological optical model analysis. It is found that the real and imaginal potentials show a pronounced energy dependence. The behaviour of the potential at the nearly especially sub-barrier energies in the ^6Li＋^208Pb system is quite different from the results of some previous reports observed in other systems, such as ^19F＋^208Pb and ^16O＋^208Pb. This unusual threshold phenomenon indicates that breakup channel is strongly coupled with the elastic channel and has obvious effects on optical potential.