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痕量PBBs/PBDEs GC/MS分析法中PCB及其衍生物干扰消除方法 被引量:1
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作者 华丽 张洪权 +2 位作者 张蕾 刘涛 黄元乔 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2011年第7期137-146,共10页
电子电气产品中痕量阻燃剂聚溴联苯/聚溴联苯醚(PBBs/PBDEs)的检测通常采用气相色谱/质谱(GC-MS)联用法,但该法是建立在持久性污染物多氯化苯/多氯化萘(PCBs/PCNs)基础上,因此此类物质干扰不可避免。为了解决此类问题,提出了2种解决方法... 电子电气产品中痕量阻燃剂聚溴联苯/聚溴联苯醚(PBBs/PBDEs)的检测通常采用气相色谱/质谱(GC-MS)联用法,但该法是建立在持久性污染物多氯化苯/多氯化萘(PCBs/PCNs)基础上,因此此类物质干扰不可避免。为了解决此类问题,提出了2种解决方法:1)阴离子化学电离-气相色谱/质谱联用法(GC/MS-NICI)和电子轰击-气相色谱/质谱联用法(GC/MS-EI)联合使用;2)以YMC ODS-C18为载体,基质固相分散法(MSPD)吸附分离。结果显示,前者可以同时洞察聚溴联苯和联苯醚的分子链断裂后阴离子碎片[Br]-,[HBr2]-和分子链段碎片[M+2]+,[M+4]+,[M+6]+,[M+8]+的滞留峰,增加了对溴系阻燃剂的选择性。后者可以有效分离多种多氯化苯与聚溴联苯醚的色谱峰,这为溴系阻燃剂气相色谱/质谱联用分析法中多氯化苯及其衍生物干扰提供了新的解决方法。采用此方法对8类电子电气产品中10种聚溴联苯醚和多氯化苯进行加标回收实验及精密度分析,回收率在60%~98%,相对误差在9.5%以内,符合国际电工委员会(IEC)对溴系阻燃剂检测精度要求,说明方法具有较高的可靠性,也为我国电子电气业更好遵守RoHS指令提供了技术支持。 展开更多
关键词 PBBs/PBDEs/PCBs GC/MS分析法 MSPD法 衍生物干扰 消除
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Direct Perturbation Method for Derivative Nonlinear Schrdinger Equation
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作者 CHENG Xue-Ping LIN Ji HAN Ping 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第8期501-504,共4页
We extend Lou's direct perturbation method for solving the nonlinear Schrodinger equation to the case of the derivative nonlinear Schrodinger equation (DNLSE). By applying this method, different types of perturbati... We extend Lou's direct perturbation method for solving the nonlinear Schrodinger equation to the case of the derivative nonlinear Schrodinger equation (DNLSE). By applying this method, different types of perturbation solutions are obtained. Based on these approximate solutions, the analytical forms of soliton parameters, such as the velocity, the width and the initial position, are carried out and the effects of perturbation on solitons are analyzed at the same time. A numerical simulation of perturbed DNLSE finally verifies the results of the perturbation method. 展开更多
关键词 direct perturbation method perturbed derivative nonlinear SchrSdinger equation
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Synthesis of c-di-GMP analogs modified by ganciclovir and biological activity to induce type Ⅰ interferon
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作者 Hong Dai Xiaotong Yu +2 位作者 Zhu Guan Lihe Zhang Zhenjun Yang 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2019年第12期825-834,共10页
C-di-GMP is one kind of second messengers which plays an important role not only in the regulation of various bacterial physiological activities but also in the activation of innate immune response to induce typeⅠint... C-di-GMP is one kind of second messengers which plays an important role not only in the regulation of various bacterial physiological activities but also in the activation of innate immune response to induce typeⅠinterferon in mammalian cells.In this assay,by using one-pot phosphoramidite method,three novel kinds of analogs of c-di-GMP including its phosphorthiates modified by ganciclovir(7 a,7 b,7 c)have been designed and synthesized.The immune-stimulatory results of these c-di-GMP analogs in RAW-Lucia ISG cells indicated that they couldn’t induce the release of typeⅠinterferon,which demonstrated that the intact structure of ribose moieties is very vital for their bioactivity upon the activation of STING signaling pathway. 展开更多
关键词 Cyclic dinucleotides c-di-GMP analogs GANCICLOVIR TypeⅠinterferon
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Interference in the Quantum Ising Model
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作者 徐酉阳 粟多武 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第1期51-55,共5页
Using the measure of interference defined in this paper, we investigate the quantum phase transition of one-dimensional Ising chains. We find that thermal fluctuations affect the interference more strongly at the crit... Using the measure of interference defined in this paper, we investigate the quantum phase transition of one-dimensional Ising chains. We find that thermal fluctuations affect the interference more strongly at the critical point. We also show that the derivative of the interference with respect to the coupling parameter, A, can be depressed by the thermal fluctuation. Finally, we find that this suppression is due to multi-particle excitations. 展开更多
关键词 quantum interference quantum phase transition quantum Ising model
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