以L-天冬氨酸为手性选择剂对手性药物的毛细管电泳拆分

以Ｌ－天冬氨酸为手性选择剂,建立了对１０种手性药物旋光异构体的毛细管电泳快速分离方法,优化了分离条件,并对分离机理作了初步探讨。     

Positronium Decay in a Circular Polarized Laser Field

We calculate the lifetime of both the o-Ps and the p-Ps positronium annihilation decay Ps →γγ in the strong circular polarized laser field. We take a strategy of the faztorization to separate the effects caused by the Coulomb interaction and the strong laser 6eld interaction. It is factorized in the time direction but not in the space direction. Our results show that in the laser with long wavelength and high intensity, the lifetimes of those Ps states are dramatically increased. For C02 laser with 10 μm wavelength and 1013 W/cm2 intensity, lifetime of the spin-single positronium is increased by 108 times. Our result is consistent with those obtained by solving the SchSdinger equation. This effect may be useful for the high harmonic generation （HHG） effects provided with the Ps [Phys. Rev. Lett. 70 （1993） 774; Phys. Rev. Lett. 93 （2004） 013601].     

铀-4,5-二溴苯基萤光酮-吐温-60显色体系的分光光度法研究

铀的高灵敏高选择性的光度法尚少见。最近有人合成过二溴苯基萤光酮(下简称Br-PF),但未见用于测定铀的报导。为此,本文研究了在吐温-60存在下用Br-PF测定铀的条件,结果表明,本法的灵敏度较高(ε=1.79×10⁵),是迄今为止铀最灵敏的显色反应(见表1)。采用三辛胺(TOA)萃取分离铀,并用于岩矿中铀的测定。     

交汇测量系统线阵相机标定方法

为了提高大靶面交汇测量系统的测量准确度,分析了交汇测量原理,推导出脱靶量坐标公式.根据脱靶量公式分析其各项参量,利用几何关系建立像元坐标与偏移角度之间的映射模型.根据映射模型,利用光栅尺设计了一种针对线阵相机的标定方法,该方法不考虑相机参量,将整个光学系统看作一个整体,基于整体参量直接对像元坐标和它所对应的偏移角进行标定.实验结果表明,标定后的交汇测量系统在1.4m处的平均测量误差为0.4mm,最大测量误差优于0.6mm.该方法简单高效,可提高系统标定的速度,且标定误差满足系统交汇测量准确度的要求.     

Charmed-Hadron Production in Υ(1S) Semi-inclusive Decay

In the framework of the NRQCD factorization formalism,we calculate the decay rate for the process Υ(1 S) → ccgg to the next-to-leading order(NLO) in the relative velocity v of the b quark in the bottomonium rest frame.We also study the momentum distributions of the charm quark and the charmed-hadron in the decay.The momentum distribution of the charmed-hadron is obtained by convolving the charm quark momentum distribution with a fragmentation function of the charm quark into the hadron.In addition,we fit the nonperturbative NRQCD matrix element v 2 Υ through comparing the theoretical prediction with the measurement from the BaBar collaboration for the decay rate of Υ(1 S) → D + X.In return,taking this matrix element as an input parameter,we predict the decay rates as well as the momentum distributions for a collection of charmed-hadrons in the process Υ(1S) → ccgg → hX.     

“外界条件对化学平衡的影响”教学设计

1指导思想与理论依据新课程改革要求教师的教育观念、教育方式、教学行为等都要发生很大的转变,使学生由以前的"学会"到"想学"再到"会学",创建开放的学习环境与提高化学课堂教学实效性的研究式教学法就是在这种理念下应运而生的,该教学法以解决问题为中心,注重学生的独立钻研,着眼于创造思维能力的培养,充分发挥学生的主动性和创造性。     

Study of surface exfoliation on crystalline silicon induced by Co-implantation of He and H ions

Crystalline n-type Si (100) wafers were implanted at room temperature with     

以L-谷氨酰胺为手性选择剂毛细管电泳拆分几种药物旋光对映体

以Ｌ－谷氨酰胺为手性选择剂,建立了对普萘洛尔、慢心律、心律平、苯丙哌酮、异丙肾上腺素、氯胺酮、山莨菪碱、洛贝林、布比卡因、苯海索等１０种手性药物对映体的毛细管电泳快速分离方法,在含有６０ｍｍｏｌ／Ｌ Ｌ－谷氨酰胺,６０ｍｍｏｌ／Ｌ硼砂（ｐＨ＝９．２５）的缓冲溶液中,１０种手性药物在１１ｍｉｎ内达到基线分离。并对分离机理作了初步探讨。     

以L-白氨酸为手性选择剂用毛细管电泳法拆分12种手性药物

 建立了一种以L 白氨酸为手性选择剂用毛细管区带电泳法快速分离 12种手性药物的方法。实验结果表明 ,手性对映体的分离度受L 白氨酸浓度和缓冲液 pH的影响。在含有 70mmol/LL 白氨酸 ,5 0mmol/L硼砂 (pH9.0 )的溶液中 ,12种手性药物在 11min之内得到了基线分离。