Testing Serial Correlation in Partially Linear Additive Models

Acta Mathematicae Applicatae Sinica, English Series - As an extension of partially linear models and additive models, partially linear additive model is useful in statistical modelling. This paper...     

反垃圾邮件及粗糙朴素贝叶斯邮件分类器

垃圾邮件的广泛传播严重的影响的电子邮件的正常使用，对当前主要的反垃圾邮件过滤技术进行了分类和研究，并且提出了基于ROUGHSET优化的朴素贝叶斯分类邮件过滤算法。基于上述理论的反垃圾邮件过滤实验证明了算法的有效性。     

相干态与压缩态迭加的量子特性

基于量子力学基本理论,构造了一个由相干态与单模压缩态构成的新迭加态:|φ>=N(|α> eiψ|β>g);详细讨论了其压缩效应和光子数反聚束效应,发现该迭加态呈现出多样的量子特性.在按类似奇偶相干态的方式迭加时,迭加态具有奇偶相干态和压缩奇偶相干态的某些特性.作为特例,当压缩因子为0时,可以得到奇偶相干态和相干态.     

动态扭振法观察环氧树脂/蒙脱土插层聚合物的二次固化

聚合物 /无机纳米复合材料是当今材料研究中的热点。但由于无机纳米颗粒在聚合物中不易分散 ,有时用具有纳米层间距的片晶结构的无机矿物 ,如蒙脱土作填料 ,通过聚合时的热效应来撑开片晶达到蒙脱土的纳米级分散 ,制得所谓的插层聚合物〔1〕。插层型纳米复合材料不仅物理力学性能有很大提高 ,并且也为高分子凝聚态物理工作者提供了研究聚合物分子在二维空间受限情况的理想模型。由于在蒙脱土层间和层外的聚合物所处的环境不一样 ,它们的一些行为会有所不同。本文在用动态扭振法研究环氧树脂 /蒙脱土插层聚合物的等温固化行为时 ,观察到了该…     

非参数固定效应Panel Data模型的统计推断

本文主要讨论了非参数固定效应Panel data模型的估计与检验问题,首先我们利用Profile最小二乘方法得到了固定效应与非参数部分的估计;接着基于比较原假设与备择假设下模型拟合的残差平方和的思想针对固定效应的检验问题构造了检验统计量,并给出了计算检验p-值的F分布逼近法。     

药用高分子材料亲水性修饰的研究进展

高分子材料在药物制剂和制药工艺上具有广泛的应用价值。新型制剂的研发与药用高分子材料的性能密切相关,特别是高分子胶束等两亲性高分子材料的使用尤为广泛,也是高分子材料当今研究的热点。本文着重对常见药用高分子材料亲水性修饰的亲水片段进行了概括总结。根据亲水片段的大小,分为小分子修饰、水溶性聚合物修饰以及水溶性高分子修饰三个部分,对药用高分子材料亲水修饰的修饰剂和修饰产物的性质特点、修饰方法以及其中的优势和不足尽可能的进行了综述,并对此进行了讨论和展望,以期能够给同行们提供参考并共讨论。     

基于时空加权回归模型北京市房屋租赁价格的空间分析

基于北京市77个小区2013年4月到2014年3月的月度房屋租赁价格数据,利用时空加权回归模型分析了租赁价格与其相关协变量之间的关系,结果揭示了北京房屋租赁价格的空间特征和不同影响因素的影响.     

Influence of siloxane co-segment length and content of waterborne polysiloxane-urethane copolymers on their water resistance, thermal stability and mechanical properties

<正>A series of stable waterborne polysiloxaneurethane(WPSUR) dispersions were prepared using amino-terminated polydimethylsiloxane(NS),dimethylolpropionic acid(DMPA),castor oil,polypropylene glycol and toluene diisocyanate. Meanwhile,NS with different molecular weights was synthesized and used as the soft co-segment.Effects of types and contents of soft co-segments as well as chain extenders on the thermal degradation and stability for WPSUR films were examined.Results reveal that WPSUR films exhibit excellent water resistance and mechanical properties as compared with pure polyurethane(PU) films,and the NS soft co-segment possesses a remarkable effect on the second stage(stageⅡ),while the content of the hard segment is propitious to the initial stage(stageⅠ).Moreover,the highest temperature of stageⅡ(T_(2m)) for WPSUR films using NS as soft co-segment is 413℃,approximately being 30℃higher than that of those typical PUs using HDA and APDMS as the chain extenders,respectively.     

A stack protocol of CTM type with quartet feedback

In this paper, we analysed a stack protocol of the CTM (Capetanakis-Tsybakov-Mikhaikov) type with quartet feedback. We obtained the explicit expression of the expectation of CRI (Collision Resolution Interval) duration for the delayed access case. By means of numerical calculation we gave respectively the maximal capacities of channel of 0.4140 and 0.41445 packets/ slot for both the delayed case and immediate cases.