Comparison of performance between rescaled range analysis and rescaled variance analysis in detecting abrupt dynamic change

In the present paper, a comparison of the performance between moving cutting data-rescaled range analysis(MCR/S) and moving cutting data-rescaled variance analysis(MC-V/S) is made. The results clearly indicate that the operating efficiency of the MC-R/S algorithm is higher than that of the MC-V/S algorithm. In our numerical test, the computer time consumed by MC-V/S is approximately 25 times that by MC-R/S for an identical window size in artificial data. Except for the difference in operating efficiency, there are no significant differences in performance between MC-R/S and MC-V/S for the abrupt dynamic change detection. MC-R/S and MC-V/S both display some degree of anti-noise ability. However, it is important to consider the influences of strong noise on the detection results of MC-R/S and MC-V/S in practical application processes.     

络合物形成曲线用于金属络合物稳定常数的极谱法研究

本文用示差脉冲极谱技术研究Pb(Ⅱ) 络合剂(β N 三丙酸)体系。依据实验得到的极谱峰电位的移动随溶液pH值的变化关系曲线,建立合适的金属络合物体系模型。用计算机分析程序,通过求解体系的质量平衡方程及拟合实验络合物形成曲线,优化得到金属络合物的稳定常数。计算机分析结果表明,在所研究的pH值范围内,溶液中存在四种金属络合物:PbH2L+、PbHL、PbL-、PbL(OH)2-,其稳定常数(logβ)分别为:16.23±0.04、12.42±0.01、4.11±0.05、9.43±0.02。     

基于计时库仑技术的可再生型三磷酸腺苷适配体电化学传感器的研究

构建了一种可再生型三磷酸腺苷(ATP)适配体计时库仑电化学传感器.将一条短链DNA通过AuS键自组装固定在电极表面, ATP的核酸适配体与该短链DNA杂交而结合在电极表面.带负电的DNA通过静电吸引结合电解液中的六氨合钌(RuHex)阳离子.当传感器和靶分子ATP孵育后,ATP与核酸适配体结合,使适配体链从电极表面解离,电极表面吸附的DNA量减少,结合RuHex的量随之降低.通过计时库仑技术检测RuHex响应信号降低的量 ,可以对ATP进行定量测定.此传感器的电化学响应信号与ATP浓度对数值呈线性关系,线性检测范围为0.001~100 μmol/L,检出限(S/N=3)为0.5 nmol/L.此传感器检测靶分子ATP后,可以通过简单的操作步骤再生,再生5次后的响应信号为初始信号的90%以上.采用此传感器检测大鼠脑透析液中ATP的含量为(19.2±3.7) nmol/L (n=3).