Attempt to generalize fractional-order electric elements to complex-order ones

The complex derivative D~(α±jβ), with α, β∈ R+ is a generalization of the concept of integer derivative, where α = 1,β = 0. Fractional-order electric elements and circuits are becoming more and more attractive. In this paper, the complexorder electric elements concept is proposed for the first time, and the complex-order elements are modeled and analyzed.Some interesting phenomena are found that the real part of the order affects the phase of output signal, and the imaginary part affects the amplitude for both the complex-order capacitor and complex-order memristor. More interesting is that the complex-order capacitor can do well at the time of fitting electrochemistry impedance spectra. The complex-order memristor is also analyzed. The area inside the hysteresis loops increases with the increasing of the imaginary part of the order and decreases with the increasing of the real part. Some complex case of complex-order memristors hysteresis loops are analyzed at last, whose loop has touching points beyond the origin of the coordinate system.     

色—质联用吹洗与捕集技术法测定水中挥发性有机污染物

参照美国环保局(U.S.E.P.A)提供的624法,研究了用Finnigan—MAT 5100型GC/MS/DS联用吹洗与捕集技术法测定水中挥发性有机物。1.使用0.2% Carbowax 1500涂于Carbopack C 上和用3% OV-1涂于Chromsorb 上的二种填充柱,直接测定5ml饮用水中有机物。共检出24种有机物,其中15种是属于EPA所规定的优先考虑的重点     

三类发射光谱产生机理的比较

在中学物理新教材中，对光谱部分的要求有所变化，连续光谱的要求有所降低，分子光谱基本不涉及，而原子光谱要求有所提高。原子光谱更加突出与玻尔理论的联系，量子理论得到进一步渗透。为了比较全面地了解三类光谱的区别，这里对它们的产生机理作一下对比。     

大柴胡汤加味预防胆管塑料内支架再阻塞的临床研究

目的评价大柴胡汤对预防胆管塑料内支架再阻塞的疗效和安全性。方法68例因胆道疾病而放置胆道塑料内支架（ERBD）患者随机分为大柴胡汤剂组（40例,男：女=18：22）和对照组（28例,男：女=13：15）,3个月后收集内支架,观察支架阻塞情况。采用免疫定量分析支架内膜抗核周因子抗体（APF）含量;红外光谱检测胆红素钙、胆固醇和碳酸钙盐含量;细菌学培养分析支架内细菌成分。结果（1）大柴胡汤组和对照组APF蛋白定量分析分别为（16.579±8.62）ng/ml和（10.46±3.25）ng/ml,两组差异有统计学意义（P＜0.05）;（2）对照组支架内生物膜的胆红素和碳酸钙含量均明显高于大柴胡汤剂组（P＜0.01);（3）相比未阻塞的支架,大多阻塞的支架包含多种的细菌种群。结论胆道感染多由肠道细菌逆行感染引起,阻塞支架内生物膜的主要成份是胆红素钙和部分碳酸钙。而大柴胡汤通过影响APF,有助于减缓胆道支架蛋白生物膜的形成,而保持胆道通畅。