滴定分析法测定铜的改进

提出在ＮＨ４ＨＦ２介质中，有ＳＣＮˉ存在下，以Ｉˉ３—淀粉为指示剂，硫代硫酸钠滴定铜的分析方法     

聚丙烯管材加工性能研究

研究了无规共聚聚丙烯管材（PP－R）管材专用料的加工工艺，PP管材加工设备的选用及模具设计参数，并对PP－R管材焊接工艺进行了研究，结果表明，合适的加工工艺条件，成型设备及焊接工艺能够保证PP－R管材的质量。     

双模移动终端主动探测系统的DSP设计与实现

针对移动终端用户身份识别的技术需求,设计了一种基于GSM和CDMA双模制式下基带信号处理的主动探测系统。为了满足主动探测系统的实时处理需求,采用高性能的DSP芯片TMS320C6416作为核心处理器,结合其他器件设计硬件系统,完成基带信号处理板中DSP芯片硬件接口的设计。经现场测试结果验证,系统能够实现对开机状态下GSM和CDMA移动用户身份信息的快速捕获,进而表明本设计可满足系统实时性和可靠性的要求。     

Deriving length two path centered surface area for the arrangement graph: a generating function approach

We discuss the notion of \(H\) -centered surface area of a graph \(G\) , where \(H\) is a subgraph of \(G\) , i.e., the number of vertices in \(G\) at a certain distance from \(H\) , and focus on the special case when \(H\) is a length two path to derive an explicit formula for the length two path centered surface area of the general and scalable arrangement graph, following a generating function approach.     

UHMWPE纤维/LDPE复合材料防弹性能及机理研究

本文探讨了用超高分子量聚乙烯（UHMWPE）纤维增强低密度聚乙烯（LDPE）复合材料的防弹性能，研究了不同基体含量对复合材料防弹性能的影响。实验证明，UHMWPE纤维／LDPE复合材料具有较好的防弹性能，其最佳的基体含量在26％左右。同时，本文还通过分析防弹片材的断裂区域及复合材料的防弹机理确定了弹丸的变形情况和靶片“背凸”在防弹作用中的贡献。     

End-capped polystyrene with 8-hydroxyquinoline group by ATRP method

8-Hydroxyqunioline end-capped polystyrene was prepared through atom transfer free radical polymerization (ATRP) with 8-(5-chloromethyl) quinolyl acetate as initiator. The results indicated that this polymerization is a first order reaction with respect to monomer conversion. The molecular weight increased linearly with monomer consumption and very narrow distribution of molecular weight was obtained (polydispersity index less than 1.2). The FT-IR and NMR results show that the 8-hydroxyquinloine group was chemically bonded to the polymer end and there is nearly one 8-hydroxyquinoline group in per polymer chain. All those data show that polymerization of styrene at such conditions displayed living characters. The polymer with 8-hydroxyqquinoline end group reacted with triethylaluminum to form polymeric light-emitting complex and single layer LED was prepared by common spin-coating method. The peak wavelength of LED based on synthesized polymeric complex was around 570 nm.     

Humidity sensitivity of polypyrrole and polypyrrole/SBA‐15 host–guest composite materials

Polypyrrole (PPY) and PPY/SBA‐15 host–guest composite materials have been prepared using chemical synthesis route and characterized by XRD, IR, N₂ adsorption–desorption isotherms, and SEM. The humidity sensitive properties (HSP) of this kind of materials have been studied by analyzing the variation curve of impedance as a function of relative humidity. It was found that the PPY/SBA‐15 host–guest composites materials exhibit better HSP than that of the corresponding pure PPY. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3301–3305, 2006     

D-HOCS: an algorithm for discovering the hierarchical overlapping community structure of a social network

Social networks often demonstrate a hierarchical organization, with communities embedded within other communities; moreover, nodes can be shared between different communities, i.e. communities in social networks may be overlapping. In this paper, we define a hierarchical overlapping community structure to present overlapping communities of a social network at different levels of granularity. Discovering the hierarchical overlapping community structure of a social network can provide us a deeper understanding of the complex nature of social networks. We propose an algorithm, called D-HOCS, to derive the hierarchical overlapping community structure of social networks. Firstly, D-HOCS generates a probability transition matrix by applying random walk to a social network, and then trains a Gaussian Mixture Model using the matrix. Further D-HOCS derives overlapping communities by analyzing mean vectors of the Gaussian mixture model. Varying the number of components, D-HOCS repeatedly trains the Gaussian mixture model, detecting the overlapping communities at different levels of granularity. Organizing the overlapping communities into a hierarchy, D-HOCS can finally obtain the hierarchical overlapping community structure of the social network. The experiments conducted on synthetic and real dataset demonstrate the feasibility and applicability of the proposed algorithm. We further employ D-HOCS to explore Enron e-mail corpus, and obtain several interesting insights. For example, we find out a coordinator who coordinated many sections of the Enron Corporation to complete an important task during first half of 2001. We also identify a community that corresponds to a real organization in Enron Corporation.     

基于解码缓冲信息的IPTV QoE策略

提供一种可在IPTV用户的终端接收设备上评测QoE(Quality of Experience)的方法。该方法通过实时监测设备上的解码缓存的状态以及缓存中的媒体丢失率作为参数,并基于统计和实验数据建立这些参数和QoE的函数关系,最终给出它们之间的推算公式来量化当前流媒体视频的QoE等级(MOS值)。考虑到终端设备(如IPTV机顶盒)的处理能力在应用中还会对相应方法做一些优化。     

CacO3在PP和PP/mPE共混物基体中的作用比较

研究CaCO3填料在取丙烯（PP）和茂金属聚乙烯（mPE)弹性体增韧PP共混物（PP／mPE)2种基体中的不同作用。结果表明：在PP基体中，填料显著提高其刚性，而在共混物基体中，由于弹性体的存在，填料的增强作用减弱；弹性体能够改善填料粒子和基体的界面粘合，增大弹性体分散相的尺寸，使PP/mPE共混物的拉伸断裂韧性提高。低温下（－30℃）的Charpy缺口冲击实验表明：少量的CaCO3即可导致PP/mPE体系冲击强度的迅速下降。