Field-amplified on-line sample stacking for separation and determination of cimaterol, clenbuterol and salbutamol using capillary electrophoresis

A capillary electrophoresis method, using field-amplified sample injection (FASI), was developed for separation and determination of some beta 2-agonists, such as cimaterol, clenbuterol and salbutamol. The optimum conditions for this system had been investigated in detail. The precision of the migration time, peak height and accuracy were determined in both intra-day (n = 5) and inter-day (n = 15) assays. Under the optimum conditions, the detection limits (defined as S/N = 3) of this method were found to be lower than 2.0 ng/mL for all of these three beta 2-agonists, which were much lower than that of the conventional electro-migration injection method, the enhancement factors were greatly improved to be 30-40-fold. Such lower detection limit lets this method to be suitable for determination of above-mentioned beta 2-agonists in the urine sample. The mean recoveries in urine were higher than 96.2%, 95.6% and 95.3% for cimaterol, clenbuterol and salbutamol, respectively, with relative standard deviations lower than 3.5%.     

手性乙烯基二联苯单体的合成与螺旋选择性聚合反应

设计、合成了一系列含有手性烷氧基末端的乙烯基二联苯单体,进行了普通自由基、原子转移自由基以及负离子聚合反应.所有单体中,只有手性烷氧基苯基位于乙烯基邻位的聚合物的比旋光度与其单体相比有比较大的区别,且在对应于其侧基的紫外吸收处呈现明显不同于单体的Cotton效应,说明可能形成了某一方向占优的螺旋构象.在所研究范围内,聚合条件和聚合物分子量对聚合物的旋光度没有明显的影响.比较负离子聚合和自由基聚合所获得聚合物的比旋光度发现,负离子聚合有利于增加聚合物螺旋链构象的完整性.切除能形成螺旋链的聚合物侧基上的手性烷氧基,所得到的聚合物虽然不含手性原子但依然表现出光学活性,说明其具有一定的手性记忆效应.     

Hamilton体系与辛正交系的完备性*

本文定义了一个Banach空间ZH,并证明了一类Hamilton体系的本征函数系(辛正交系)在ZH空间中具有完备性.还证明了如下结论ZH空间能连续嵌入到L₂[0,1]×L₂[0,1]但ZH≠L₂[0,1]×L₂[0,1].     

A new approach to backlund transformations of nonlinear evolution equations

I.IntroductionBacklundtransformationandLaxpairsplayanimportantroleinsolitarytheory.BecausenonlineariterativeprinciplefromBacklundtransformationsconverttheproblemofsolvingnonlineardifferentialequationstopurelyalgebraicoperation.Moreover,manyconnectionsamongBacklundtransformation,infinateconservationlawandinversescattering,etc.canbefoundbyusingBacklundtransformations12'31.Laxpairsconvertnonlineardifferentialequationstoapairoflinearequations.Weiss,TaborandCarnevalell]definedthePainlevepropert…     

矩阵多元多项式的带余除法及其应用

给出矩阵多元多项式的带余除法,从而用微分代数的观点,得到把一类微分方程(组)化为无穷维Hamilton系统的充要条件及其具体无穷维Hamilton系统形式。再把此方法和吴方法相结合获得构造一类微分方程(组)的通解的新方法。几个例子表明这些方法都很有效的。     

变形色散水波方程的Auto-B(a)cklund变换、多孤子解和有理分式解

利用未知数变换并借助Mathematica软件,给出了变形色散水波方程的Auto-B(a)cklund变换以及它与热传导方程和线性方程之间的Darboux变换.进而用此变换,获得了变形色散水波方程的多孤子解、有理分式解及其他精确解.这种思路也适用于其他的非线性方程.     

同轴式Reditron的计算机模拟

用二维全电磁模型粒子模拟的方法对同轴式反射电子甑别微波发生器-同轴式Reditron中的虚阴极振荡现象进行了研究。模拟结果表明:当注入电流超过同轴波导中的空间电荷限制电流时,在同轴波导漂移区将会形成虚阴极振荡。在给定的模拟参数下,获得了窄带的TM₀₁模式K波段的高功率微波输出,峰值瞬时输出功率达8.62GW,效率在7~10%之间。     

关于偏微分方程解的规模,恰当解,形式幂级数解和序的优化

基于Reid标准型,楔子(盒子)理论,吴方法解决了一些偏微分方程组的维数问题 -即解的规模,并给出了形式幂级数解并编制了算法．最重要的是给出了验证恰当解的优序-即Ⅱ-型序。     

A new discrete integrable system and its discrete integrable coupling system

In terms of the properties of the known loop algebra and difference operators, a new algebraic system X is constructed, which is devote to working out the well-known generalized cubic Volterra lattice equations hierarchy. Then an extended algebraic system of X is presented, from which the integrable coupling system of generalized cubic Volterra lattice equations are obtained.     

毛细管区带电泳法同时测定饲料中西马特罗、盐酸克伦特罗和沙丁胺醇

建立了同时测定饲料中西马特罗、盐酸克伦特罗与沙丁胺醇的毛细管区带电泳-紫外检测方法。考察了实验参数对 分离和检测结果的影响。在最佳实验条件下,在60 mmol/L的柠檬酸-柠檬酸钠运行缓冲液(pH 6.29)中,上述3种物质在8 min内完全分离。西马特罗、盐酸克伦特罗和沙丁胺醇的线性响应范围为0.1~1.0 mg/L,最低检测限(以信噪比为3计)分 别为0.02,0.03和0.02 mg/L。所建立的方法直接用于饲料中西马特罗、盐酸克伦特罗和沙丁胺醇的测定,结果令人满意 。