CATIONIC CONDUCTIVITY FOR THE CROSSLINKED P [OLIGO (OXYETHYLENE) METHACRYLATE-COoMETHACRYLOYL ALKYLSULFONIC ACID LITHIUM]

Crosslinked copolymers with single Li~+-ionic conductivity were prepared from oligo (oxyethylene) methacrylate (MEO_n), methacryloyl alkylsulfonic acid lithium (SAMLi), and oligo (oxyethylene) dimethacrylate (DMEO_n). Li~+-ionic conductivity of the copolymer is improved by crosslinking and presented as a function of polymerization degree (n) in MEO_n, comonomeric salt concentration (O/Li), and crosslinking degree. The crosslinked copolymer P (0.7 MEO_(14)-0.3DMEO_(14)-SHMLi) without other small molecular additives exhibits an optimum Li~+-ionic conductivity of 1.2×10~(-6) S/cm at 25℃. Dc polarization test in the cell composed of Li/copolymer/Li shows a constant dc ionic conductivity which closes gradually to the ac one with decreasing dc polarization potential.     

STUDIES ON ENHANCED CONDUCTIVITY OF STRETCHED CONDUCTING POLYMERS

A physical model of series of the conductivity on chain and the interchain conductivitybetween chains is proposed to explain enhanced conductivity of stretched conducting polymers.This model suggests that the enhanced conductivity for stretched conducting polymers might bedue to increasing of the interchain conductivity between chains along the elongation direction afterdrawing processes if the conductivity on chain is assumed much larger than that of the interchainconductivity between chains. According to this model, it is expected that the temperaturedependence of conductivity measured by four-probe method for stretched conducting polymers iscontrolled by a variation of the interchain conductivity between chains with temperature, whichcan be used to explain that a metallic temperature dependence of conductivity for stretchedconducting polymers is not observed although the conductivity along the elongation direction isenhanced by two or three orders of magnitude.     

一类非线性方程的迭代解及应用

利用锥理论和单调迭代方法研究了一类非线性方程解的存在唯一性及其迭代过程，对所述的映射没有作连续性、紧性或具有上、下解的假定．作为应用，把所获得的结果用到Banach空间一阶微分方程．     

试论我国矿业企业的技术创新

知识经济时代是以创新为重要特征的。创新是知识经济的核心。也是提高矿业企业市场竞争力、促进矿业企业生产发展的动力。目前我国矿业企业技术创新能力不强，技术成果转化率低下，各种制度因素、经济因素和环境因素制约着企业的创新和发展。从我国矿业企业技术创新的现状分析入手，提出了提高企业技术创新能力的对策。     

从孔子天命观看儒学与宗教的关系

孔子对天命鬼神存而不论、敬而远之的态度决定了儒学的非宗教性，而他重视现实、关注人生、突出祭祀、慎重追远等特点使儒学具有了浓郁的人文意识，也使儒学为中国人的生活及思维方式确立了基调。了解孔子天命观的特点有助于我们把握儒学的特点及其与宗教的关系。     

基于MATLAB的数值求导

数值微分作为一个典型的反问题,在Hadamard意义下是不适定的,即在求导中函数的微小扰动就可能导致计算上很大的误差.本文基于连续的Tikhonov正则化方法,讨论了用离散正则化方法处理数值求导的有关理论和技术问题包括离散正则解的收敛性、稳定性和在原始数据的误差水平已知和未知的情况下的正则参数选取问题,给出了稳定的和有效的算法,并在Matlab环境下加以实现,进行了成功的数值试验和对比试验研究.     

基体的梯度结构对涂层硬质合金性能的影响

通过控制烧结气氛制备了均质和梯度结构的硬质合金基体，并用化学气相沉积制成涂层硬质合金及切削刀片。采用光学显微镜和扫描电镜观察，通过显微硬度抗弯测试和切削试验对均质基体和梯度基体的涂层硬质合金的组织特征与性能进行对比研究。研究结果表明，梯度结构的硬质合金基体可以提高涂层硬质合金的抗弯强度；相对于均质基体的涂层硬质合金刀片，梯度基体的涂层硬质合金刀片在保持耐磨性能的同时能显著提高抗冲击性能。基体涂层合金的组织结构及断口特征显示，梯度基体表层韧性区可阻碍裂纹的扩展。     

并行流程式生产线调度问题的概率分析求解算法

并行生产线调度问题兼有并行机器和流程车间调度问题的特点 ,是一类新型的调度问题·针对工件在各工序具有任意加工时间的一般并行生产线调度问题 ,构造了整数规划模型 ,设计了基于概率分析的求解算法·对随机生成的测试问题进行求解的实验结果表明了算法的有效性     

牙齿楔状缺损修复临床研究

目的 研究光敏树脂与玻璃离子联合修复楔状缺损的临床疗效．方法 160例480颗楔状缺损的牙齿随机分组，1例以光敏树脂修复，称光敏组；对侧以光敏树脂及玻璃离子联合充填，称复合组，随访3a，进行临床疗效对比．结果 复合组成功率为95．42％，光敏组成功率为75％．结论 光敏树脂与玻璃离子联合修复楔状缺损临床疗效理想．     

磷肥对苎溪河的污染初探

由于施用不当，磷肥对苎溪河的水环境造成了一定的污染；在讨论磷肥对苎溪河污染的现状、原因等基础上，提出一些防治对策．