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Measurement of the differential cross sections and angle-integrated cross sections of the ~6Li(n,t)~4 He reaction from 1.0 eV to 3.0 MeV at the CSNS Back-n white neutron source

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Chinese Physics C 2020年第1期44卷 58-85页

作者： Huaiyong Bai Ruirui Fan Haoyu Jiang Zengqi Cui Yiwei Hu Guohui Zhang Zhenpeng Chen Wei Jiang Han Yi Jingyu Tang Liang Zhou Qi An Jie Bao Ping Cao Qiping Chen Yonghao Chen Pinjing Cheng Changqing Feng Minhao Gu Fengqin Guo Changcai Han Zijie Han Guozhu He Yongcheng He Yuefeng He Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Hantao Jing Ling Kang Mingtao Kang Bo Li Lun Li Qiang Li Xiao Li Yang Li Yang Li Rong Liu Shubin Liu Xingyan Liu Guangyuan Luan Yinglin Ma changjun ning Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Hong Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Pengcheng Wang Qi Wang Taofeng Wang Yanfeng Wang Zhaohui Wang Zheng Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Li Yu Tao Yu Yongji Yu Jing Zhang Linhao Zhang Liying Zhang Qingmin Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yingtan Zhao Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsSchool of PhysicsPeking UniversityBeijing 100871China Sate Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China Physics Department Tsinghua UniversityBeijing 100084China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China University of South China Hengyang 421001China Northwest Institute of Nuclear Technology Xi’an 710024China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China Beihang University Beijing 100083China Xi’an Jiaotong University Xi’an 710049China

The^6 Li(n,t)~4 He reaction was measured as the first experiment involving neutron-induced charged particle emission reactions at the CSNS(China Spallation Neutron Source)Back-n white neutron *** differential cross-sections of the^6 Li(n,t)~4 He reaction at 15 detection angles ranging from 19.2°to 160.8°are obtained from 1.0 eV to 3.0 MeV at 80 neutron energy points;for 50 energy points below 0.1 MeV they are reported for the first *** results indicate that the anisotropy of the emitted tritium is noticeable above E_n=100 *** angle-integrated cross-sections are also *** present differential cross-sections agree in general with the previous evaluations,but there are some differences in the *** importantly,the present results indicate that the cross-sections of the^6 Li(n,t)~4 He reaction might be overestimated by most evaluations in the 0.5-3.0 MeV region,although they are recommended as standards below 1.0 MeV.

关键词： ~6Li(n,t)~4He reaction differential cross-section angle-integrated cross-section LPDA

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Measurements of differential and angle-integrated cross sections for the 10B（n, α）7Li reaction in the neutron energy range from 1.0 eV to 2.5 MeV

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Chinese Physics C 2019年第12期43卷 47-74页

作者： Haoyu Jiang Wei Jiang Huaiyong Bai Zengqi Cui Guohui Zhang Ruirui Fan HanYi changjun ning Liang Zhou Jingyu Tang Qi An Jie Bao Yu Bao Ping Cao Haolei Chen Qiping Chen Yonghao Chen Yukai Chen Zhen Chen Changqing Feng Keqing Gao Minhao Gu Changcai Han Zijie Han Guozhu He Yongcheng He Yang Hong Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Zhijie Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Chao Li Jiawen Li Lun Li Qiang Li Xiao Li Yang Li Rong Liu Shubin Liu Xingyan Liu Guangyuan Luan Qili Mu Binbin Qi Jie Ren Zhizhou Ren Xichao Ruan Zhaohui Song Yingpeng Song Hong Sun Kang Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Qi Wang Taofeng Wang Zhaohui Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Li Yu Tao Yu Yongji Yu Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yubin Zhao Luping Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Department of Modem Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Northwest Institute of Nuclear Technology Xi'an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China School of Physics Beihang UniversityBeijing 100083China

Differential and angle-integrated cross sections for the 10B(n,α)^7 Li,10B(n,α0)^7 Li and 10B(n,α1)^7 Li^*reactions have been measured at CSNS Back-n white neutron *** enriched(90%)10B samples 5.0 cm in diameter and^85.0μg/cm^2 in thickness each with an aluminum backing were prepared,and back-to-back mounted at the sample *** charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array(LPDA)*** neutron energy En was determined by TOF(time-of-flight)method,and the valid a events were extracted from the En-Amplitude two-dimensional *** 15 silicon detectors,the differential cross sections of a-particles were measured from 19.2°to 160.8°.Fitted with the Legendre polynomial series,the(n,a)cross sections were obtained through *** absolute cross sections were normalized using the standard cross sections of the 10B(n,α)^7 Li reaction in the 0.3-0.5 MeV neutron energy *** measurement neutron energy range for the 10B(n,α)^7 Li reaction is 1.0 eV≤En<2.5 Me V(67 energy points),and that for the 10B(n,α0)^7 Li and10B(n,α1)^7 Li^*reactions is 1.0 eV≤En<1.0 MeV(59 energy points).The present results have been analyzed by the resonance reaction mechanism and the level structure of the 11B compound system,and compared with existing measurements and evaluations.

关键词： 10B(n,α)^7Li reaction cross sections LPDA CSNS Back-n white neutron source

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Neutron capture cross section of ^(169)Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV

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Chinese Physics C 2022年第4期46卷 92-104页

作者： Jie Ren Xichao Ruan Wei Jiang Jie Bao Jincheng Wang Qiwei Zhang Guangyuan Luan Hanxiong Huang Yangbo Nie Zhigang Ge Qi An Huaiyong Bai Yu Bao Ping Cao Haolei Chen Qiping Chen Yonghao Chen Yukai Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Minhao Gu Changcai Han Zijie Han Guozhu He Yongcheng He Yang Hong Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Haoyu Jiang Zhijie Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Chao Li Jiawen Li Lun Li Qiang Li Xiao Li Yang Li Rong Liu Shubin Liu Xingyan Liu Qili Mu changjun ning Binbin Qi Zhizhou Ren Yingpeng Song Zhaohui Song Hong Sun Kang Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Jingyu Tang Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Qi Wang Taofeng Wang Zhaohui Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Han Yi Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yubin Zhao Luping Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Northwest Institute of Nuclear Technology Xi'an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China School of Physics Beihang UniversityBeijing 100083China

The capture cross sections of the ^(169)Tm(n,γ)reaction were measured at the back streaming white neutron beam line(Back-n)of the China Spallation Neutron Source(CSNS)using four C_(6)D_(6) liquid scintillation *** background subtraction,normalization,and correction were carefully considered in the data analysis to obtain accurate cross *** the resonance at 3.9 eV,the R-matrix code SAMMY was used to determine the resonance parameters with the internal normalization *** average capture cross sections of ^(169)Tm for energy between 30 and 300 keV were extracted relative to the ^(197)Au(n,γ)*** measured cross sections of the ^(169)Tm(n,γ)reaction were reported in logarithmically equidistant energy bins with 20 bins per energy decade with a total uncertainty of 5.4%-7.0% in this study and described in terms of average resonance parameters using a Hauser-Feshbach calculation with *** point-wise cross sections and the average resonance parameters showed fair agreement with the evaluated values of the ENDF/B-Ⅷ.0 library in the energy region studied.

关键词： ^(169)Tm(n,γ)^(170)Tm reaction capture cross section PHWT CSNS Back-n white neutron source

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Measurement of differential cross sections of neutron-induced deuteron production reactions on carbon from 25 to 52 MeV

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Chinese Physics C 2021年第6期45卷 109-120页

作者： Zengqi Cui Haoyu Jiang Kang Sun Guohui Zhang Ruirui Fan Wei Jiang Huaiyong Bai Yiwei Hu Jie Liu Han Yi changjun ning Zhijia Sun Jingyu Tang Qi An Jie Bao Yu Bao Ping Cao Haolei Chen Qiping Chen Yonghao Chen Yukai Chen Zhen Chen Changqing Feng Keqing Gao Minhao Gu Changcai Han Zijie Han Guozhu He Yongcheng He Yang Hong Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Zhijie Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Chao Li Jiawen Li Lun Li Qiang Li Xiao Li Yang Li Rong Liu Shubin Liu Xingyan Liu Guangyuan Luan Qili Mu Binbin Qi Jie Ren Zhizhou Ren Xichao Ruan Zhaohui Song Yingpeng Song Hong Sun Xiaoyang Sun Zhixin Tan Hongqing Tang Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Qi Wang Taofeng Wang Zhaohui Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Li Yu Tao Yu Yongji Yu Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yubin Zhao Luping Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Northwest Institute of Nuclear Technology Xi'an 710024China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China School of Physics Beihang UniversityBeijing 100083China

The angle-differential cross sections of neutron-induced deuteron production from carbon were measured at six neutron energies from 25 to 52 MeV relative to those of n-p elastic scattering at the China Spallation Neutron Source(CSNS)Back-n white neutron *** employing theΔE-E telescopes of the Light-charged Particle Detector Array(LPDA)system at 15.1°to 55.0°in the laboratory system,ratios of the angle-differential cross sections of the ^(12)C(n,xd)reactions to those of the n-p scattering were measured,and then,the angle-differential cross sections of the ^(12)C(n,xd)reactions were obtained using the angle-differential cross sections of the n-p elastic scattering from the JENDL-4.0/HE-2015 library as the *** obtained results are compared with data from previous measurements,all of which are based on mono-energic neutrons,the evaluated data from the JENDL-4.0/HE-2015 library and the ENDF-B/VIII.0 library,and those from theoretical calculations based on INCA code and Talys-1.9 *** the first white-neutron-source-based systematic measurement of the angle-differential cross sections of neutron-induced deuteron production reactions on carbon in several tens of MeV,the present work can provide a reference to the data library considering the lack of experimental data.

关键词： ^(12)C(n,xd)reactions relative angle-differential cross sections CSNS Back-n white neutron source LPDA

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基于激光点云数据的裂隙岩体渗流场的无单元法模拟

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岩石力学与工程学报 2011年第11期30卷 2330-2337页

作者：刘昌军丁留谦宁保辉张顺福中国水利水电科学研究院北京100038

利用三维激光扫描技术获取岩体表面高精度激光点云数据,进而得到岩体裂隙网络的几何信息和产状分布情况。研究基于激光点云坐标数据求解含复杂裂隙网络岩体二维渗流场的无单元法,采用罚函数法处理渗流边界条件,并推导无单元Galerkin法... 详细信息

利用三维激光扫描技术获取岩体表面高精度激光点云数据,进而得到岩体裂隙网络的几何信息和产状分布情况。研究基于激光点云坐标数据求解含复杂裂隙网络岩体二维渗流场的无单元法,采用罚函数法处理渗流边界条件,并推导无单元Galerkin法的基本方程和积分格式。该方法首先将激光点云数据经坐标投影和抽稀后作为无单元模拟的节点坐标数据;然后结合岩体裂隙网络的几何信息,采用无单元法计算渗流场,进而分析岩体的渗透特性。该方法具有以下优点:(1)可以精确获取高陡边坡的裂隙产状、位置坐标、长度和开度等几何信息;(2)直接将激光点云作为无单元法节点,减少生成裂隙网格和生成节点坐标的工作;(3)将裂隙网络采用裂隙渗透张量表示,可以对非连通裂隙、不同开度和不同充填程度的裂隙进行模拟。在此基础上,应用IDL编制基于海量激光点云数据的岩体裂隙产状分析和无单元法渗流场数值模拟软件LIDAREFM,并计算怀柔县桥梓镇一裸露岩石边坡的渗流场。计算结果表明,该方法是可行、有效的,计算得到的渗流场分布及特性能够反映岩体裂隙网络对渗流场的影响。该方法为研究裂隙岩体真实渗流场分布提供了一种新的研究思路。

关键词：岩石力学岩体裂隙激光点云无单元法渗流场 LIDAREFM软件

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激光功率对40CrNiMoA钢表面淬火组织和摩擦磨损性能的影响

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金属热处理 2020年第3期45卷 128-133页

作者：杨振樊湘芳邱长军李勇柳宁南华大学机械工程学院湖南衡阳421001 衡阳中钢衡重设备有限公司湖南衡阳421001

采用不同激光功率在卷取机卷筒主轴40CrNiMoA钢基材表面进行了激光淬火试验,利用体视显微镜、光学显微镜、显微硬度计和立式万能摩擦磨损试验机等观察和测试试样横截面的宏观组织、表面显微组织、激光相变硬化区的显微硬度和摩擦磨损性... 详细信息

采用不同激光功率在卷取机卷筒主轴40CrNiMoA钢基材表面进行了激光淬火试验,利用体视显微镜、光学显微镜、显微硬度计和立式万能摩擦磨损试验机等观察和测试试样横截面的宏观组织、表面显微组织、激光相变硬化区的显微硬度和摩擦磨损性能。结果表明:3种不同功率下的激光淬火试样表层组织均得到不同程度的细化,其硬度、摩擦磨损性能较基体均有所提升。其中,当功率为1600 W时,在试样截面能够明显观察到相变硬化区。此时,试样的表层组织最为细致,由细小的针状马氏体、少量残留奥氏体和弥散分布的细小碳化物组成,其表面硬度可达640.3~706.8 HV0.2,约为基体硬度的2.8倍。同时,摩擦因数稳定在0.40~0.60之间,与基体相比降低了50%左右;磨损量1.3 mg,仅为基体的36.1%。在光斑尺寸12 mm×2 mm,扫描速度v=20 mm/s的试验条件下,采用1600 W激光功率对40CrNiMoA钢进行表面激光淬火,得到的试样组织和摩擦磨损性能最优。

关键词： 40CrNiMoA钢激光淬火激光功率显微组织摩擦磨损

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正交异性圆板的非线性弯曲

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兰州大学学报（自然科学版） 1989年第4期25卷 33-40页

作者：宁建国程昌钧兰州大学甘肃兰州

本文以中心挠度为迭代参数,利用修正迭代法求解了受均布载荷作用的极正交各向异行圆板的非线性轴对称弯曲,得到了二次近似表达式.

关键词：圆板非线性弯曲正交异性载荷

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国有企业控制权转移对企业风险承担的影响

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财贸经济 2021年第8期42卷 130-144页

作者：张吉鹏衣长军李凝华侨大学经济与金融学院 362021 华侨大学工商管理学院 362021

在混合所有制改革中,国有企业控制权转移对企业行为和绩效有着重要的影响。合理的风险承担对促进企业自身成长和宏观经济活力具有积极的意义。本文基于2003—2016年中国A股上市公司数据,构建多时点双重差分模型检验国有企业控制权转移... 详细信息

在混合所有制改革中,国有企业控制权转移对企业行为和绩效有着重要的影响。合理的风险承担对促进企业自身成长和宏观经济活力具有积极的意义。本文基于2003—2016年中国A股上市公司数据,构建多时点双重差分模型检验国有企业控制权转移对企业风险承担的影响及其机制。结果发现,国有企业控制权转移显著抑制了企业风险承担;第二类代理问题越严重,国有企业控制权转移对企业风险承担的抑制效应越明显,表明国有企业控制权转移通过控制权私利机制抑制了企业风险承担;进一步的异质性分析表明,股权制衡程度和机构持股比例越高以及地区法治水平和市场化程度越高,国有企业控制权转移对企业风险承担的抑制效应越弱。本文研究为理解国有企业控制权转移的经济效应提供了新的经验证据。优化内外部公司治理环境可以缓解国有企业控制权转移后企业过度规避风险倾向,提高企业风险承担水平。

关键词：国有企业控制权转移风险承担控制权私利

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The Threshold and Modes of the End-pumped Solid-state Laser

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Chinese Journal of Lasers 1999年第1期 12-15页

作者： LIU ning LIU Songhao LIAO changjun XU Wencheng (Institute of Quantum Electronics, South China Normal University, Guangzhou 510631, China)

１ＩｎｔｒｏｄｕｃｔｉｏｎＬａｓｅｒｄｉｏｄｅｐｕｍｐｅｄｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓａｒｅｏｆｈｉｇｈｅｆｉｃｉｅｎｃｙ，ｃｏｍｐａｃｔｎｅｓ，ａｎｄｒｅｌｉａｂｉｌｉｔｙ，ｅｓｐｅｃｉａｌｙｉｎａｎｅｎ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＬａｓｅｒｄｉｏｄｅｐｕｍｐｅｄｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓａｒｅｏｆｈｉｇｈｅｆｉｃｉｅｎｃｙ，ｃｏｍｐａｃｔｎｅｓ，ａｎｄｒｅｌｉａｂｉｌｉｔｙ，ｅｓｐｅｃｉａｌｙｉｎａｎｅｎｄｐｕｍｐｉｎｇｃｏｎｆｉｇｕｒ...

关键词： solid state laser end pump mode threshold

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分子模拟研究微孔材料对光气吸附扩散性能的影响及材料筛选

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高等学校化学学报 2019年第2期40卷 317-325页

作者：陈晓锋宁贺佳杨犁彭昌军孙炜武汉工程大学绿色化工过程教育部重点实验室和湖北省新型反应器与绿色化学工艺重点实验室化工与制药学院武汉430205 华东理工大学化学与分子工程学院上海200237

利用分子模拟的方法研究了微量光气(COCl2)在微孔材料中的吸附和扩散性能,并分析了材料结构的影响.结果表明,光气在金属有机框架材料(MOF)和共价有机框架材料(COF)中的吸附等温线主要表现为第Ⅰ类型和第Ⅴ类型吸附.当光气压力较低时,CO... 详细信息

利用分子模拟的方法研究了微量光气(COCl2)在微孔材料中的吸附和扩散性能,并分析了材料结构的影响.结果表明,光气在金属有机框架材料(MOF)和共价有机框架材料(COF)中的吸附等温线主要表现为第Ⅰ类型和第Ⅴ类型吸附.当光气压力较低时,COF材料和含有开放金属位点的材料对其吸附性能较好.通过对不同压力下吸附量的比较发现,吸附达到饱和前,随着压力和孔隙率(VF)的升高,材料对光气的吸附量增大.通过分子动力学模拟研究光气在微孔材料中的扩散性能发现,较强吸附位点的存在不利于光气在孔道中的扩散.通过气体分子在材料中的径向函数分布图及模拟轨迹分析发现,分子协同效应和空间位阻效应相互竞争决定了扩散速率的快慢.综合评价材料的吸附和扩散性能发现,COF-102,COF-300,Zn MOF-74,Zn-DOBDC和PCN-60是理想的吸附材料,这些材料可以应用于环境中光气泄漏的防治.

关键词：光气微孔材料分子模拟吸附性能扩散系数

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