具有阶段结构的连续时滞生态系统的一致生存与全局渐近稳定性

研究了具有阶段结构和有限时滞捕食-食饵系统的一致持久性,并利用建立Lyapunov函数的方法得到了系统全局渐近稳定的充分条件．     

Optimal selection for the weighted coefficients of the constrained variational problems

The aim is to put forward the optimal selecting of weights in variational problemin which the linear advection equation is used as constraint. The selection of the functionalweight coefficients ( FWC) is one of the key problems for the relevant research. It wasarbitrary and subjective to some extent presently. To overcome this difficulty, thereasonable assumptions were given for the observation field and analyzed field, variationalproblems with " weak constraints" and " strong constraints" were considered separately. Bysolving Euler' s equation with the matrix theory and the finite difference method of partialdifferential equation, the objective weight coefficients were obtained in the minimumvariance of the difference between the analyzed field and ideal field. Deduction results showthat theoretically the optimal selection indeed exists in the weighting factors of the costfunction in the means of the minimal variance between the analysis and ideal field in terms ofthe matrix theory and partial differen     

惯性约束聚变激光烧蚀驱动内界面不稳定性数值模拟

利用水平集方法和三阶本质无振荡(ENO)方法研究了流体力学界面不稳定性和激光烧蚀驱动内界面不稳定性数值模拟,并用数值算例与LARED-S程序的运算结果进行了比较.数值结果表明此方法计算惯性约束聚变激光烧蚀驱动内界面不稳定性的有效性和精确性.     

电化学氧化法去除苯酚研究

利用氯碱厂报废的DSA电极电解苯酚,结果显示:此电极对一定浓度的苯酚溶液有较好的去除效果.按影响电解效果各主要因素进行筛选,最佳实验条件为:电流密度30mA/cm2,pH10,支持电解质浓度10mg/L,苯酚浓度10mg/L.电解2h后,CODcr的去除率为66.7%,吸光度去除率为90%.     

水溶液中金属团簇的脉冲辐解研究进展

介绍了以脉冲辐解技术为手段研究水溶液中单金属团簇的形成机理,并对团簇的性质及其反应进行了简要的概括,对今后团簇的发展趋势进行了展望.     

水溶液中金属团簇的脉冲辐解研究进展

介绍了以脉冲辐解技术为手段研究水溶液中单金属团簇的形成机理,并对团簇的性质及其反应进行了简要的概括,对今后团簇的发展趋势进行了展望。     

A SENSITIVE AND STABLE CONFOCAL FABRY－PéROT INTERFEROMETER FOR SURFACE ULTRASONIC VIBRATION DETECTION

A new confocal Fabry－Pérot interferometer (CFPI) has been constructed. By using both of the conjugate rays, the sensitivity of the system was doubled. Moreover, the negative feedback control loop of a single-chip microcomputer (MCS-51) was applied to stabilize the working point at an optimum position. The system has been used in detecting the piezoelectric ultrasonic vibration on the surface of an aluminium sample.     

糖尿病大鼠肝细胞膜中胰岛素受体巯基的检测

采用四氧嘧啶腹腔注射法建立糖尿病大鼠实验模型,用巯基试剂盒紫外可见分光光度法研究四氧嘧啶所致糖尿病模型大鼠肝脏细胞膜中胰岛素受体的性质变化.实验结果表明,糖尿病大鼠肝脏组织细胞膜胰岛素受体的自由巯基含量明显低于正常大鼠,每克蛋白质降低了22%(P＜0.05),提示糖尿病大鼠肝细胞膜胰岛素受体存在氧化损伤.     

离子色谱法测定血液透析浓缩液中乙酸根

血液透析目前在医疗领域广泛应用，主要用于肾功能衰竭。透析液浓缩液是指一种含有高浓度电解质的液体，使用时按特定比例用透析用水稀释后成透析液使用，在我国属三类医疗器械产品，其质量直接关系到病人健康和血液透析效果。我国透析液浓缩液标准正在制定中，国外主要有两个标准。透析液浓缩液主要常由碳酸氢钠浓缩物与乙酸盐浓缩物混合而成。血液透析浓缩液中乙酸根浓度要求为标示量±10％，所以测定血液透析浓缩液中乙酸根对于产品质量的控制非常重要。