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The effect of collision energy on the stereodynamics of the reaction H(~2S)+NH(X^3∑^-,v = 0,j = 0)→ N(~4S)+H_2

Chinese Physics B 2013年第6期22卷 596-602页

作者：何缔王美山杨传路姜志军 School of Physics and Optoelectronic Engineering Ludong University

The quasi-classical trajectory （QCT） is calculated to study the stereodynamics properties of the title reaction H（^2S）＋ NH （X^3 ∑^-, v = 0, j = 0）→ N（^4S）＋ H2 on the ground state ^4A″ potential energy surface （PES） constructed by Zhai and Han [2011 Jr. Chem. Phys. 135 104314]. The calculated QCT reaction probabilities and cross sections are in good agreement with the previous theoretical results. The effects of the collision energy on the k-kt distribution and the product polarization of H2 are studied in detail. It is found that the scattering direction of the product is strongly dependent on the collision energy. With the increase in the collision energy, the scattering directions of the products change from backward scattering to forward scattering. The distribution of P（Or） is strongly dependent on the collision energy below the lower collision energy （about 11.53 kcal/mol）. In addition, the P（（Pr） distribution dramatically changes as the collision energy increases. The calculated QCT results indicate that the collision energy plays an important role in determining the stereodynamics of the title reaction.

关键词： stereodynamics quasi-classical trajectory method vector correlation collision energy

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The influence of collision energy on magnetically tuned^(6)Li-^(6)Li Feshbach resonance

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Chinese Physics B 2022年第6期31卷 326-333页

作者： Rong Zhang Yong-Chang Han Shu-Lin Cong Maksim B Shundalau Department of Physics Dalian University of TechnologyDalian 116024China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116024China Physics Department Belarusian State UniversityMinskBelarus

The effect of collision energy on the magnetically tuned^(6)Li-^(6)Li Feshbach resonance(FR)is investigated theoretically by using the coupled-channel(CC)method for the collision energy ranging from 1μK·kBto 100μK·*** the collision energy of 1μK·kB,the resonance positions calculated are 543.152 Gs(s wave,the unit 1 Gs=10^(-4)T),185.109 Gs(p wave|ml|=0),and 185.113 Gs(p wave|ml|=1),*** p-wave FR near 185 Gs exibits a doublet structure of 4 mGs,associated with dipole-dipole *** the increase of the collision energy,it is found that the splitting width remains the same(4 mGs),and that the resonance positions of s and p waves are shifted to higher magnetic fields with the increase of collision *** variations of the other quantities including the resonance width and the amplitude of the total scattering section are also discussed in *** thermally averaged elastic rate coefficients at T=10,15,20,25 K are calculated and compared.

关键词： Feshbach resonance collision energy ^(6)Li-^(6)Li system

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Appropriate choice of collision-induced dissociation energy for qualitative analysis of notoginsenosides based on liquid chromatography hybrid ion trap time-of-flight mass spectrometry

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Chinese Journal of Natural Medicines 2016年第4期14卷 278-285页

作者： WANG Guang-Ji FU Han-Xu XIAO Jing-Cheng YE Wei RAO Tai SHAO Yu-Hao KANG Dian XIE Lin LIANG Yan Key Lab of Drug Metabolism & Pharmacokinetics State Key Laboratory of Natural Medicines China Pharmaceutical University

Liquid chromatography hybrid ion trap/time-of-flight mass spectrometry possesses both the MS^n ability of ion trap and the excellent resolution of a time-of-flight and has been widely used to identify drug metabolites and determine trace multi-components in natural products. collision energy, one of the most important factors in acquiring MS^n information, could be set freely in the range of 10%–400%. Herein, notoginsenosides were chosen as model compounds to build a novel methodology for the collision energy optimization. Firstly, the fragmental patterns of the representatives for the authentic standards of protopanaxadiol-type and protopanaxatriol-type notoginsenosides were obtained based on accurate MS^2 and MS^3 measurements via liquid chromatography hybrid ion trap/time-of-flight mass spectrometry. The extracted ion chromatograms of characteristic product ions of notoginsenosides in Panax Notoginseng Extract were produced under a series of collision energies and compared to screen the optimum collision energies values for MS^2 and MS^3. The results demonstrated that the qualitative capability of liquid chromatography hybrid ion trap/time-of-flight mass spectrometry was greatly influenced by collision energies, and 50% of MS^2 collision energy was found to produce the highest collision-induced dissociation efficiency for notoginsenosides. Addtionally, the highest collision-induced dissociation efficiency appeared when the collision energy was set at 75% in the MS^3 stage.

关键词： collision energy collision-induced dissociation Notoginsenosides Qualitative analysis

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Investigation of the effect of filling level on the wear and vibration of a SAG mill by DEM

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Particuology 2022年第4期20卷 24-34页

作者： Changhua Xie Yuan Zhao Tao Song Yongzhi Zhao Institute of Process Equipment Zhejiang UniversityHangzhou 310027China State Key Laboratory of Process Automation in Mining & Metallurgy.Beijing 100160 China Beijing Key Laboratory of Process Automation in Mining & Metallurgy Beijing 100160China

Semi-autogenous grinding(SAG)mill is widely used in the grinding process of coal and ores because of its strong applicability,large capacity and low consumption of grinding ***,the research of SAG mill is still of great important practical *** those parameters of the SAG mill,the flling level is very important for it is not only directly related to the processing capacity of the mill,but also affects the operation cost and stability of *** this paper,combined with shear impact energy model(SIEM)and discrete element method(DEM),the particle collision energy spectrum was applied to analyze the influence of ore flling level and media flling level on the power draw of the mill,the impact energy on ore,and the wear of liner and media in a slice of an industrial SAG *** was found that increasing the ore flling level would increase energy consumption and reduce the energy efficiency and the wear of liner and grinding ***,the vibration of mill was explored from the collision energy on *** results showed that the low frequency but high energy ollision between grinding media and liner was the main reason for liner wear and mill vibration.

关键词： Flling level SAG mill collision energy DEM Wear Vibration

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串联质谱法检测复杂基质中的吗啡

串联质谱法检测复杂基质中的吗啡

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中国质谱学会第七届会员代表大会暨学术报告会

作者：谢增瑞河南省郑州市公安局刑事科学技术研究所

吗啡(Morphine)是存在于罂粟壳中的一种生物碱类镇痛药,反复服用后极易造成身体依赖而成瘾。将把罂粟壳作为调料加入饮食中,可致使他人形成毒瘾。烩面中的吗啡不仅含量较低,而且受面汤中油脂和其他成分的干扰,给检验带来了一定的难度,... 详细信息

吗啡(Morphine)是存在于罂粟壳中的一种生物碱类镇痛药,反复服用后极易造成身体依赖而成瘾。将把罂粟壳作为调料加入饮食中,可致使他人形成毒瘾。烩面中的吗啡不仅含量较低,而且受面汤中油脂和其他成分的干扰,给检验带来了一定的难度,用一般方法难以检测。为了消除干扰,提高复杂基质中吗啡的检测灵敏度,本工作拟应用串联质谱法对烩面中的吗啡进行检验研究。

关键词： tandem mass spectrometry parent ion collision energy morphine

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