尿中4种麻黄素类药物的GC／MSD测定

麻黄素、伪麻黄素、去甲麻黄素、去甲伪麻黄素作为兴奋剂药物及相关化合物被国际奥委会规定为禁用药物~[1],并对其作了限量规定~[2].前文曾用气相色谱法对该类药物进行了分离与测定~[3].本文采用色质联用技术,对含有这4种药物的尿样进行了分离,并采用选择离子检测(SIM)方式,以二苯胺为内标准物建立了对这4种药物同时定量的测定方法.本方法最低检测限为1μg/mL尿.其它兴奋剂药物及尿中化合物对检测无干扰.     

Development of the Model of the Generalized Quintom Dark Energy

We consider a generalized quintom （GQ） dark energy model for changing the equal weight of the negative-kinetic scalar field （phantom） and the normal scalar field （quintessence） in quintom dark energy. Though the phantomdominated scaling solution is a stable late-time attractor, the early evolution of GQ is different from that of the quintom model and the adjustability of the dark energy state equation in the model is improved.     

短链控制图

本文介绍了短链过程及其短链控制图方法, 其中包括对子群和个体情形下的画点统计量及控制限, 同时也给出了有关它们之间的比较.     

基于奇异值分解的岭型回归(英文)

本文基于设计阵的奇异值分解(SVD),从LS估计出发,应用岭回归估计方法,构造了回归系数的一个新的有偏估计,称为基于SVD的岭型回归估计,简称RRSVD估计,讨论了其性质和偏参数的选取问题,得到了许多重要结论.计算结果表明,在设计阵呈病态时,RRS善岭回归估计.     

Experimental Observation on Orientation Relationship between Binary Cd5.7Yb Quasicrystal and its Crystalline Approximant Cd6Yb

Similarity in the electron diffraction patterns of the Cd5.7 Yb icosahedral quasicrystal and its cubic approximant Cd6 Yb crystal is studied in detail by using transmission electron microscopy. The icosahedral twofold axes are parallel to the cubic （1ττ^2） （τ= 1.618…） or （0 0 1） directions, the icosahedral pseudo-twofold axes are parallel to the cubic （15 21 25） directions, the icosahedral threefold axes are parallel to the cubic 〈1 1 1〉 and the icosahedral fivefold are parallel to the cubic 〈0 1 τ〉 directions. Based on those observations a general stereographic projection is given to illustrate the exact orientation relationship.     

Quintessence Contribution to a Schwarzschild Black Hole Entropy

The quintessence contribution to a Schwarzschild black hole entropy is thoroughly investigated by using the improved brick-wall model. It is found that due to the present of the quintessence, there are two horizons, one is the cosmological horizon, and the other is the black hole horizon. By regulating the cut-off factor ε and the thickness of the thin layer 5, we obtain that the entropy of the system is 1/4 of the sum of the areas of the two event horizons.     

Pseudo-invariant Eigen-operator of a System About Three-Level Atom in Presence of a Kerr-Like Medium

A system of a three-level atom interacting with single mode cavity field through multi-photon transition in the presence of a Kerr-like medium is proposed, and its pseudo-invariant eigen-operator (PIEO) and energy-level gap are presented under one-order approximation.     

负载银纳米管钛酸催化剂的制备

采用光催化还原法制备了载银纳米管钛酸,通过TEM可以看到纳米管钛酸表面附着有银颗粒,XPS和XRD等结果显示银颗粒是以单质银的形式存在.对亚甲基蓝光催化降解实验结果表明:载银纳米管钛酸催化剂的催化活性比未载银纳米管钛酸催化剂的活性高.     

电解有机溶液法在Si表面制备类金刚石薄膜及退火对其结构的影响

在对不同有机溶剂分子结构分析的基础上,选取甲醇、DMF(N,N-二甲基甲酰胺)和乙腈溶液为碳源,以脉冲直流电源电解有机溶液的方法在Si片上制得了含氢类金刚石薄膜(DLC薄膜),并研究了退火对薄膜结构的影响.通过X射线光电子能谱(XPS),喇曼(Raman)和红外(IR)光谱对薄膜的结构进行了分析表征.XPS表明薄膜的主要成分为C,喇曼光谱显示所得薄膜为典型DLC薄膜.喇曼和红外光谱还表明,膜中含有大量H并且主要键合于sp³碳处.随着退火的进行薄膜中的H被去除.随温度升高薄膜电阻率的下 关键词： 类金刚石薄膜 退火     

金属纳米粒子在聚合物中的磁致排列──实验及分子动力学模拟

用磁场控制碳包镍纳米颗粒在环氧树脂中的排列,制备了具有优异电学性能的一维有序的纳米复合材料.在添加质量分数为3%-10%的镍纳米颗粒时,导电率提高了3个数量级,介电常数增大了2-3倍.对纳米颗粒的磁致排列进行了分子模拟,结果表明,偶极强相互作用是导致纳米粒子排列的主要原因,排列过程经历了聚合、成链和粗化等阶段,成链的时间尺度在秒数量级.模拟结构与实验观察结果基本一致.