反相液相色谱中溶质保留参数间的定量关系研究

 比较了Snyder经验公式中的K0w 与S和溶质计量置换保留模型 (SDM R)中溶质保留参数Z(1mol溶剂化溶质被溶剂化固定相吸附时 ,在其接触表面处释放出溶剂或置换剂的总摩尔数 )与lgI(与 1mol溶质对固定相的亲和势有关的常数 )之间的定量关系。SDM R中的两个参数间不仅对同系物溶质可以有很好的线性关系 ,而且对非同系物溶质也有很好的线性关系。其线性关系的好坏主要取决于这两个参数数值范围的大小 ,与文献中报告的线性关系取决于是否单因素影响溶质的保留和完全由统计学规律决定的结论不同。     

高载酶量酶/酶免疫电极的制备及其电化学机理研究

本文利用扫描电镜和电化学方法确定了最佳镀铂电位,并进一步研究了酶电极和酶免疫电极在基体电极镀铂和未镀铂条件下的米氏常数、电化学反应速率常数和反应速度控制步骤。比较分析了生物电极的最佳实验条件。     

时间参量法（Ⅵ）——连续一级反应的热动力学研究

根据化学反应热动力学的基本原理,推导了连续一反应的积分和微分和微分热动力学方程,建立了连续一级反应热动力学时间参量法的数学模型,通过对已二酸二乙酯和邻苯二甲酸二乙酯皂化反应的热动力学研究,验证了连续一级反应时间参量法的确定性。     

Interfacial and aggregation properties of some anionic/cationic surfactant binary systems II. Mixed micelle formation and surface tension reduction effectiveness

Mixed micelle formation and surface tension reduction effectiveness (γ_cmc) were investigated for the following systems: triethanolammonium dodecylpoly(oxyethylene)sulfate (TADPS, containing about two ethylene oxide units)/dodecyltrimethylammonium bromide, TADPS/hexadecyltrimethylammonium bromide and TADPS/hexadecylpyridinium chloride. For all these anionic/cationic systems, the mixed critical micelle concentration (cmc) values reflect a strong synergism in mixed micelle formation, with β^M values ranging from −13.8 to −18.3. The mixed micelle composition is mixing-ratio dependent and, for equimolar mixtures, the mixed micelle is richer in the surfactant with the lower cmc. Precipitation is inhibited to a certain extent, thanks to the presence of ethylene oxide groups in the anionic species. The conditions for synergism in γ_cmc, differently expressed in the literature, can be derived from the surface tension equations established in our previous article. They can be conveniently described by a few characteristic constants: Γ _i ^∞ (saturated Gibbs excess), K _i (constant in the Szyszkowski equation), the cmc of the individual surfactants and the interaction parameters, β^S and β^M, of their mixtures. Excellent agreement between theoretically predicted and experimental results is obtained. With the increase in surfactant chain length, the β^M values decrease faster than the β^S ones and this can result in the loss of synergism in γ_cmc. Received: 11 June 2000 Accepted: 4 September 2000     

双参数弹性地基板计算新方法

弹性地基板的弯曲问题,尤其是自由边板,一直是学者和工程师们所十分关切的问题。本文用无单元法研究双参数弹性地基板的弯曲问题,由最小二乘法和变分原理导出了双参数弹性地基板的无单元法刚度短阵,编制相应的无单元法计算程序,并给出计算实例。结果表明本方法精度良好,可求出任意荷载作用下板中任一点的挠度、转角、弯矩和扭矩,且有广泛的工程应用前景。     

大型玻璃钢渔船帽型骨架剖面参数的力学分析

本文对大型玻璃渔船帽型架剖面参数,进行了在不受力情况下正交各向异性玻璃钢薄板稳定的力学分析,建立架受力分析－受压区的矩形薄板压缩稳定和腹板的矩形薄板剪切稳定两种力学模型,解得这两种力学模型,在两种材料（１：１玻璃钢和４：１玻璃铡）与两种边界件（四边简支和四边固支）组合的四种条件下,骨架剖面参数的ｂ／ｔ１和ｈ／ｔ的取值范围,它们依次为１０．０～２６．２和２８．７～４４．２。文中分析结果为帽型骨架剖面     

A new criterion for occurrence of strick-slip motion in drive mechanism

This paper, using Karnopp's model of friction force and phase plane method, studies the stick-slip motion of the flexble drive mechanism. It is explained that a sudden drop of friction force is the essential source of stick-slip motion when the sliding is impending. A new criterion for occurrence of stick-slip motion is established. The stick-slip region and the stable region in a parameter plane are separated by a critical parameter curve. Moreover, for the stick-slip motion of the flexible drive mechanism without viscous damping, a parameter expression is obtained. The results may be used in design of the flexible drive mechanism.     

作动器/传感器优化配置的研究进展

给出了作动器／传感器优化配置问题的数学描述,综述了作动器／传感器优化配置方法的发展现状．阐述了振动控制和模态试验中作动器／传感器优化配置的关系．并给出需要进一步研究的几个问题      

参数激励的幅值不是很小时Mathieu方程的一种解法

用改进的变形参数法求得了激励的幅值不是小量时Mathieu方程的周期解及过渡曲线。     

振动系统结构参数估计的Taylor变换法

引入了求解非线性微分方程的 Taylor变换法 ,将振动系统原分析模型变换为离散域内的代数方程组 ,建立了估计系统质量、阻尼和刚度矩阵的方程。该方法可以利用任意外载激励下的瞬态响应估计系统的结构参数 ,而不需要进行系统的模态试验 ,具有一定的工程应用价值。文中还研究了测试信号受噪声干扰时的参数估计方法 ,最后给出了 30 0 T转炉倾动机构的参数估计实例。