Shear viscosity of the binary liquid mixture 3-methylpentane + nitroethane near the consolute point

Shear viscosity measurements of a mixture of 3-methylpentane and nitroethane at the critical concentration are presented in the temperature range 0.005 KT–T _c13.93 K, where T _c is the consolute or critical temperature. The data agree with earlier measurements.     

聚丙烯固相接枝苯乙烯和丙烯酸乙酯的研究

用固相接枝共聚方法制备聚丙烯（PP）接枝聚苯乙烯（PP-g-PS)和聚丙烯接枝聚丙烯酸乙酯（PP-g-PEA)，考察了引发剂浓度、反应温度、反应时间与单体种类对接枝反应的影响，对接枝改性的PP进行结构和热分析表征，并用接枝功能化的聚丙烯做增容剂，研究了其对纳米SiO2/PP复合材料力学性能的影响。力学性能研究表明：低含量接枝聚丙烯的存在可使SiO2/PP复合材料的韧性大幅提高。     

ESTIMATION OF THEMAL PRESSURE COEFFICIENTS FOR LIQUIDS BASED ON THE LAW OF CORRESPONDING STATE

1 INTRODUCTIONThe p-V-T relation of liquids can be represented not only by equations of state,but alsoby the following three partial differentials: α=(V/T)_p/V (1) β=-(V/p)_T/V (2) γ=(p/T)_V (3)Where p,V and T denote the pressure,volume and temperature of liquids;α,βand γ are thethermal expansion,isothermal compressibility and thermal pressure coefficient,respectively. Since the densities of liquids at various temperature and constant pressure can easily bemeasured by experiments,values of α can be obtained easily.If the values of.γ can beestimated,then values of β can be acquired from the following equation:     

A RIS treatment of the mean-square dipole moment of PMMA chains in consideration of the pendant ester group orientations

According to the six-state scheme proposed by Vacatello and Flory, the mean-square dipole moments 〈M²〉/x (x: number of monomeric units) of poly(methyl methacrylate) (PMMA) chains and their temperature dependence were calculated by the matrix algebra method of rotational isomeric state theory. To take account of the orientation effect of polar ester groups, the statistical weight matrices, U′ and U″, were recast into an expanded form. A Bernoullian probability λ introduced to measure the preference between the two alternative orientations (χ=0 and χ=π) of the side ester groups was found to give rise to a large effect on the mean-square dipole moment of polymers. When the skeletal bonds of a meso dyad are both in trans, an exceptionally strong dipole-dipole interaction may take place. If the two adjacent ester groups adopt the same orientation, the dipoles must be situated nearly parallel to each other in a close proximity. Such repulsive interactions may be alleviated by taking a staggered conformation, i.e. (χ,χ′)=(0,π) or (π,0). Such neighbor-dependent correlation inherent to the meso dyad is considered by assigning a parameter λ′ to the proper element of the U_m″ matrix. The values of 〈M²〉/x observed at 30 °C were satisfactorily reproduced by adopting λ=0.270 and λ′=0.865. The thermal coefficients were found to be reconciled with the available experimental data by allowing the orientation parameters λ and λ′ to be slightly temperature dependent. The stereochemical characteristics of the chain terminals were examined in order to extend the treatment to include the dipole moment of PMMA oligomers.     

水溶性聚合物的低临界溶液温度

研究了Ｎ－异丙基丙烯酰胺与丙烯酰胺及其它几种丙烯酰胺的衍生物的共聚物在水溶液中的溶解特性。     

试论健美操比赛的情绪

通过对运动员在竞赛心理因素中——“情绪”的表现进行探讨，分析了运动员在比赛中情绪变化的主要原因，提出了有效的调节方法，对指导健美操的训练、竞赛以及提高运动员的比赛成绩都具有重要意义。     

中国当代市民社会理论研究综述

市民社会理论于上世纪90年代被引入中国,但由于市民社会本身为中国传统所未有,所以中国市民社会的建构必然采取一种不同于西方的方式。根据对近一百五十年来中国社会变革的体认,中国的市民社会论者主张采取一种将洛克的社会先于或外于国家和黑格尔的国家先于市民社会这两种不同的架构进行调和,实现市民社会与国家良性互动的方式,以摆脱历史上的变革困局。同时中国学者对市民社会理念本身及其在应用于中国实践的有效性上也进行了反思,主张从实践出发的研究方式。在实践层面上,第三部门及其理论研究也都取得了长足的发展,但还存在着包括政府干预过多等困难。     

中部引嫩引水口枯水临界期来水量及引渠现状过流能力分析

随着嫩江干流尼尔基水库的建成,嫩江枯水临界期中引引水口来水量发生变化,通过分析确定可能发生的来水量,并结合引渠现状,提出可引水量处理办法.     

利用贝尔态的高效量子密钥分配协议

提出了一个建立在EPR关联之上的量子密钥分配协议,除了用作纠错部分之外,所有的量子位都对密钥生成有贡献,因此它是高效的,每个EPR对贡献密钥的两个位,所以本协议可以获得高容量,最后证明了该协议是安全的。     

一类椭圆-抛物耦合方程组弱解的衰减估计

该文研究在热效应影响下半导体模型,它归结为一个非线性椭圆-抛物耦合方程组初边值问题.考虑此半导体方程瞬态解和稳态解之间的关系,通过对解的一系列估计,给出了在一定条件下瞬态解与稳态解的一个衰减估计.