高等数学学习方法指导的改革与实践

学习科学已经发展为一个学科群，作为学习科学的重要组成部分，高等数学学习方法指导的研究也警来越受到人们的重视，本文通过对高等数学学习方法指导的现状的剖析，提出高等数学学习方法改革的基本思路.     

住宅设计新趋势

住宅是人们生活、休息、生命繁衍的场所。随着经济的发展和社会的进步,特别是近几年来电子网络技术的发展,住宅的功能正向多元化方向发展。因此住宅设计呈现出新的设计趋势。     

New agar microspheres for the separation and purification of natural products

A new type of agar chromatography media has been prepared with a yield over 80% using a water‐in‐oil emulsion technique. These microspheres have regular spherical shapes and particle diameters in the range 40–165 μm (average ～90 μm). Cross‐linking of the resulting agar microspheres with epichlorohydrin and 1,4‐butanediol diglycidyl ether enhanced their mechanical and thermal stability. The alkaline conditions used during the cross‐linking reaction also decreased the content of ionized sulfate groups of the polysaccharide, thus reducing the nonspecific adsorption of positively charged molecules. The cross‐linked agar microspheres were functionalized with (i) branched poly(ethyleneimine) to obtain a stationary phase useful for the separation of proteins in an anion‐exchange mode and (ii) with poly‐β‐cyclodextrin enabling direct isolation and purification of puerarin from a crude extract of Radix puerariae. Using a 23.5 mL column loaded with 20 mg extract (0.85 mg/mL gel), puerarin with a purity of 96% was recovered with a yield of 86%.     

考虑了表决机的TMR计算机硬件－软件系统可靠性分析

文章讨论了一个带表决机的三重冗余（ＴＭＲ）计算机的硬件－软件系统。假定系统的三个相同的处理机及表决机的寿命均服从指数分布，软件系统的失效率是与软件系统残留错误数有关的一个常数，所有的修理时间服从一般分布。从而求得了感兴趣的可靠性指标。     

和田河流域资源开发利用与可持续发展

主要分析了田河流域的水，土资源概况及存在的问题，在研究流域人口，经济，资源，环境诸因素之间相互关系的基础上，用系统动力学模型动态定量模拟了流域人口，资源和经济发展的规模，并为流域今后的可持续发展提供了原则与对策。     

一类非线性发展方程的全局吸引子(英文)

本文研究了H01(Ω)×H01(Ω)上2≤r≤3时一类非自治发展方程的渐近行为,其中非线性项f满足临界指数增长。     

Enhancement of magnetocaloric effects in La0.8R0.2(Fe0.919Co0.081)11.7 Al1.3 (R=Pr, Nd) compounds

The magnetic properties and magnetocaloric effects (MCEs) in La_0.8R_0.2(Fe_0.919Co_0.081)_11.7Al_1.3 (R=Pr, Nd) compounds have been investigated. When Pr and Nd substitute for La, the Curie temperature of compounds decreases. The values of the MCEs are enhanced significantly by a partial substitution of Nd for La. Under the field change of 2 and 5 T, the maximum magnetic entropy changes for La_0.8Nd_0.2(Fe_0.919Co_0.081)_11.7Al_1.3 compound are −4.56 and −9.46 J/Kg K, respectively. It can be exploited for room temperature magnetic refrigeration material.     

Polymerization rate and mechanism of ultrasonically initiated emulsion polymerization of n-butyl acrylate

The factors affecting the induction period and polymerization rate in ultrasonically initiated emulsion polymerization of n-butyl acrylate (BA) were investigated. The induction period takes only an instant in ultrasonically initiated emulsion polymerization of BA without any added initiator by enhancing the N2 flow rate. Increasing temperature, power output and SDS concentration, decreasing the monomer concentration results in further decreasing induction period and enhanced polymerization rate. Under optimized reaction conditions the conversion of BA reaches 92% in 11 min. The polymerization rate can be controlled by varying reaction parameters. The apparatus of ultrasonically initiated semi-continuous and continuous emulsion polymerization were set up and the feasibility was first studied. Based on the experimental results, a free radical polymerization mechanism for ultrasonically initiated emulsion polymerization was proposed, including the sources of the radicals, the process of radical formation, the locus of polymerization and the polymerization process. Compared with conventional emulsion polymerization, where the radicals come from thermal decomposition of a chemical initiator, ultrasonically initiated emulsion polymerization has attractive features such as no need for a chemical initiator, lower reaction temperature, faster polymerization rate, and higher molecular weight of the polymer prepared.     

基于线性矩法的东江流域区域枯水频率分析

线性矩法是在概率权重法基础上发展起来的一类分布函数参数确定方法．以年最小七日平均流量作为枯水径流的统计特征量，在水文站点一致性分析、水文相似区鉴别的基础上，以常见的5种三参数分布函数：Generalized Pareto分布（GPA）、Generalized Extreme-Value分布（GEV）、Generalized Logistic分布（GLO）、LogNormal分布（LN3）和Pearson type Ⅲ（PⅢ）为研究对象进行东江流域区域枯水频率分析．分析结果表明，LN3为最适合东江流域的区域枯水分布．将实测枯水流量与采用区域化方法所得到的枯水模拟结果进行对比分析，结果表明区域化所得到的模拟精度较高，可以满足实际需要．