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Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da tang Yong-Hao Chen Jing-Yu tang Rui-Rui Fan Qiang Li Gong Li Dong Liu Zheng-Yao Jin Xing-Zhu Cui Tian-Xiang Chen Yi-Wei Yang Rong Liu Han Yi Yang Li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai Jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-Qing Feng Fan-Zhen Feng Ke-Qing Gao Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Wei-Hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang Ling Kang Bo Li Chao Li Jia-Wen Li Xiao Li Jie Liu Shu-Bin Liu Guang-Yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Xin Tan Li-Jiao Wang peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Mo-Han Zhang Qi-Wei Zhang Xian-peng Zhang Yu-Liang Zhang Yue Zhang Zhi-Yong Zhang Mao-Yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China school of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China 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 Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of chinese academy of sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the china Spallation Neutron Source(CSNS)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

Synthesis of novel chiral fluorinating agents,(+)-and(-)-N-fluoro-3-methyl-3-(4.methylphenyl)-2H-benzo[e][1,2]thiazine-1,1,4.triones

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chinese Chemical Letters 2008年第8期19卷 907-910页

作者： Hui Min Sun Zhao peng Liu Long Qian tang National Institute for the Control of Pharmaceutical and Biological Products Beijing 100050 China Department of Organic Chemistry School of Pharmaceutical Sciences Shandong University Jinan 250012 China

Treatment of N-t-butylbenzenesulfonamide with an excess of BuLi, followed by the reaction with methyl 2-（4.methylphenyl）propanoate, gave the corresponding 2-carboxybenzenesulfonamide, which underwent a sequence of consecutive N-deprotective cyclization process mediated by TMSCI-NaI-MeCN reagent to afford the N-sulfonylimine. Following the bromination and ring expansion, 3-methyl-3-（4.methylphenyl）-2H-benzo[e][1,2]thiazine-l,l,4.trione was obtained. Optical resolution of the racemic benzosultam using （-）-menthoxyacetyl chloride, furnished the optically *** （＋）- and （-）-3-methyl-3-（4.methylphenyl）-2H- benzo[e][1,2]thiazine-1,1,4.triones, which were fluorinated with FC103 to produce the corresponding chiral N-F agents.

关键词： Benzosultams Cyclization TMSCI/Nal/MeCN Enantioselective electrophilic fluorinating agent Chirality

Study of the response of 10B-doped MCP to wide-energy range neutrons from eV to MeV

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Nuclear Science and Techniques 2024年第8期35卷 132-141页

作者： Qiang Li Li‑Jiao Wang Xiang‑Biao Qiu Jing‑Wen Li Wei Xu Tao Li Ze‑Bin Lin Chang‑Jun Ning Yong‑Hao Chen Rui‑Rui Fan Kang Sun Jing‑Yu tang Rong Zhang Han‑Tao Jing Bo Mei Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Zhen Chen Zeng‑Qi Cui An‑Chuan Fan Chang‑Qing Feng Fan‑Zhen Feng Ke‑Qing Gao Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei‑Hua Jia Hao‑Yu Jiang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Chao Li Gong Li Jia‑Wen Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Guang‑Yuan Luan Bin‑Bin Qi Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Zhi‑Xin Tan Sheng‑Da tang peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Li‑Kun Xie Yi‑Wei Yang Han Yi Yong‑Ji Yu Guo‑Hui Zhang Lin‑Hao Zhang Mo‑Han Zhang Qi‑Wei Zhang Xian‑peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Mao‑Yuan Zhao Lu‑Ping Zhou Zhi‑Hao Zhou Ke‑Jun Zhu 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 Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future school Dongguan 523808China North Night Vision Science&Technology(Nanjing)Research Institute Co.Ltd. Nanjing 211106China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China school of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China 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 Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of chinese academy of sciences Beijing 100049China

Neutron-sensitive microchannel plates(nMCPs)have applications in neutron detection,including energy spectrum measurements,neutron-induced cross sections,and neutron imaging.10B-doped MCPs(B-MCPs)have attracted significant attention owing to their potential for exhibiting a high neutron detection efficiency over a large neutron energy *** spatial and temporal resolutions are useful for neutron energy-resolved ***,their practical applications still face many technical *** this study,a B-MCP with 10 mol%10B was tested for its response to wide-energy neutrons from eV to MeV at the Back-n white neutron source at the china Spallation Neutron *** neutron detection efficiency was calibrated at 1 eV,which is approximately 300 times that of an ordinary MCP and indicates the success of 10 B *** factors that caused the reduction in the detection efficiency were simulated and *** neutron energy spectrum obtained using B-MCP was compared with that obtained by other measurement methods,and showed very good consistency for neutron energies below tens of *** response is more complicated at higher neutron energy,at which point the elastic and nonelastic reactions of all nuclides of B-MCP gradually become *** is beneficial for the detection of neutrons,as it compensates for the detection efficiency of B-MCP for high-energy neutrons.

关键词： Neutron radiation image 10B-doped MCP Neutron response Wide-energy range neutrons

Ciphertext-Policy Attribute-Based Encryption with Short Keys

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chinese Journal of Electronics 2014年第4期23卷 655-660页

作者： XU peng tang Yong JIANG Wenbin JIN Hai ZOU Deqing Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology

Ciphertext-policy attribute-based encryption(CP-ABE)allows a user with some attributes to decrypt the ciphertexts associated with these *** several CP-ABE schemes with the constant size ciphertext were proposed to reduce the communication cost,their master public and secret keys still have the size linear in the total number of *** schemes are unpractical for the attribute-scalable and many-attributes scenario.A new CP-ABE scheme is *** attribute is mapped to a mathematical value by a combination *** master public and secret keys of the proposed CP-ABE scheme have the size linear in the binary size of a hash function’s *** has the comparable performance with existing schemes in the aspects like the time costs of encryption and decryption,the expressiveness of access policy and the provable security.

关键词： Ciphertext-policy attribute-based encryption Expressiveness policy Provable security

Recent progress in transition metal catalyzed cross coupling of nitroarenes

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chinese Chemical Letters 2019年第8期30卷 1481-1487页

作者： Lifen peng Zhifang Hu Zilong tang Yinchun Jiao Xinhua Xu Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine PolymersSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

In this review,the recent development in transition metal catalyzed cross coupling of nitroarenes was ***,development of transition metal catalyzed cross coupling was simply *** presenting the advantages of nitroarenes,transition metal catalyzed cross coupling using nitroarenes as electrophilic coupling partners was classified and introduced in *** on different chemical bonds such as C–O,C–S,C-C and C–N bonds constructed,different kinds cross coupling of nitroarenes would be highlighted and the plausible reaction mechanism would be presented if available.

关键词： Transition metal Catalysis Nitroarenes Cross coupling Chemical bonds

Multiple hierarchy risk assessment with hybrid model for safety enhancing of unmanned subscale BWB demonstrator flight test

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chinese Journal of Aeronautics 2019年第12期32卷 2612-2626页

作者： Yi LU Shuguang ZHANG Zejing ZHANG Xuan ZHANG peng tang Shan FU Department of Automation School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China school of Transportation Science and Engineering Beihang UniversityBeijing 100083China Airworthiness Technologies Research and Management Center China Aviation Polytechnology EstablishmentBeijing 100028China china Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610China school of Energy and Power Engineering Beihang UniversityBeijing 100083China

To explore the low-speed characteristics of the Blended-Wing-Body(BWB)configuration for future civil aircraft,a series of unmanned subscale demonstrators have been developed and tested by our research *** this process,specific safety risks deriving from uncertain design features,system unreliability,and insufficient personnel experience caused continuous flight test mishaps and the risk mechanism was not *** and trial-and-error learning driven safety improvements took few effects on mishap prevention,so our focus was turned to look for systematic safety *** paper establishes a systems theory based hybrid model to integrate the physical system reliability analysis techniques with the system dynamics method for illustrating the multiple risk interactions of the demonstrator flight test involving organizational,human resource and technical system *** the prior BB-5 demonstrator as a case,the hybrid model simulation represents its historical risk evolution process,which verifies the model rational*** risk control strategies reduced the mishap rate of a new demonstrator called BB-6 *** paper also shows the extended hybrid model can be applied on safety management of unmanned aerial vehicles from the initial period of vehicle development.

关键词： Blended-wing-body Demonstration flight test Markov analysis Risk assessment Strategy experiment System dynamics Systems theory

车前草-大蓟配伍方对糖尿病小鼠血糖和肠道菌群的影响

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中国医院药学杂志 2024年第5期44卷 530-536页

作者：陆益平叶嘉焕刘远洋苏琳祺韦星威唐云丽唐慧勤傅鹏广西中医药大学药学院广西南宁530000 广西壮瑶药重点实验室广西南宁530000 壮瑶药协同创新中心广西南宁530000 广西壮族自治区民族药资源与应用工程研究中心广西南宁530000

目的:探讨车前草-大蓟配伍方对糖尿病小鼠血糖及肠道菌群的影响。方法:采用尾静脉注射四氧嘧啶建立糖尿病小鼠模型,造模成功后给予车前草-大蓟配伍方(18、12、8 g·kg^(-1))进行干预。连续给药3周,记录每日饮水量、进食量及每周空腹血糖... 详细信息

目的:探讨车前草-大蓟配伍方对糖尿病小鼠血糖及肠道菌群的影响。方法:采用尾静脉注射四氧嘧啶建立糖尿病小鼠模型,造模成功后给予车前草-大蓟配伍方(18、12、8 g·kg^(-1))进行干预。连续给药3周,记录每日饮水量、进食量及每周空腹血糖(FBG)和体质量。末次给药后测定各组小鼠糖耐受量(OGTT)、空腹血清胰岛素(INS)和糖化血红蛋白(HbA1c)含量,HE染色观察肝脏和胰腺组织的病理病变情况,利用16S rRNA高通量测序技术进行肠道菌群结构分析。结果:与模型组相比,车前草-大蓟配伍方各组小鼠体质量、饮水量和进食量均无明显变化(P0.05),OGTT和INS含量升高(P<0.05),肝脏细胞胞质空泡化现象明显减少,胰腺细胞病理损伤减轻,细胞结构较完整。Alpha多样性中,车前草-大蓟高剂量组Shannon、Simpson指数升高(P<0.01)。Beta多样性中,车前草-大蓟组配伍方可改变糖尿病小鼠部分肠道菌群的生长与分布;在门水平上,调节拟杆菌门、厚壁菌门、变形菌门等群落组成和结构;在属水平上,调节拟杆菌属、普雷沃菌属等组成和比例。结论:车前草-大蓟配伍方可调节糖尿病小鼠肠道菌群结构和相对丰度,减轻肝细胞和胰腺细胞的损伤,改善胰岛素抵抗,发挥降糖作用。

关键词：车前草大蓟配伍糖尿病肠道菌群

Comparison of Photochemical Reactions of m-Cresol in Aqueous Solution and in Ice

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Chemical Research in chinese Universities 2012年第1期28卷 47-52页

作者： peng Fei1, XUE Hong-hai1, tang Xiao-jian1,2, KANG Chun-li1, LI Lin-lin1 and LI Zhe1 1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P. R. china 2. school of Municipal and Environmental Engineering, Jilin Institute of Architecture and Civil Engineering, Changchun 130118, P. R. china Jilin Univ Key Lab Groundwater Resources & Environm Minist Educ Changchun 130021 Peoples R China Jilin Inst Architecture & Civil Engn Sch Municipal & Environm Engn Changchun 130118 Peoples R China

We compared the photochemical reaction of m-cresol containing ·OH precursors such as H2O2, NO2 and NO3 in aqueous solution with those in ice. The results show that the conversion rate of m-cresol in aqueous solution was higher than that in ice. H2O2, NO2 and NO3 all accelerated the photoconversion of m-cresol in both aqueous solution and ice. The photochemical reactions of m-cresol obeys the first order kinetics equation. According to the photoproducts identified by GC-MS, we proposed that hydroxylation and nitration reactions occurred in both aqueous solution and ice. Coupling reaction was common in ice, however, in aqueous solution it was found only in UV system. Our results suggest that the photochemical reactions of m-cresol were different in aqueous solution and in ice.

关键词： m-Cresol Photochemistry Aqueous solution Ice Mechanism

调控磁导率以优化高熵合金的自旋电子排列实现高效析氧反应

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Science china Materials 2024年第2期67卷 598-607页

作者：陈正杰张涛吴佳静杨新春郑勇平唐永炳于海滨彭晶成会明 Faculty of Materials Science and Energy Engineering Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Wuhan National High Magnetic Field Center&school of Physic Huazhong University of Science and TechnologyWuhan 430074China Institute of Information Technology Shenzhen Institute of Information TechnologyShenzhen 518172China Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

磁场触发的催化剂轨道电子自旋排列已成为促进析氧反应的一种有趣而可行的策略.然而,具有强d-d库仑相互作用的高熵合金(HEAs)催化剂中的磁场增强机制尚未得到充分挖掘.在此,我们设计了具有优异软磁性的高熵合金金属片,在微小磁场下表现... 详细信息

磁场触发的催化剂轨道电子自旋排列已成为促进析氧反应的一种有趣而可行的策略.然而,具有强d-d库仑相互作用的高熵合金(HEAs)催化剂中的磁场增强机制尚未得到充分挖掘.在此,我们设计了具有优异软磁性的高熵合金金属片,在微小磁场下表现出显著的磁场增强催化作用,其磁导率可作为评估磁场增强的描述因子.具体地,仅施加50 mT的磁场,(FeCoNi)_(82.5)Cr_(17.5)HEAs的过电位下降就超过了36mV@10 mA cm^(-2).此外,过电位的降低与HEA的磁导率呈线性关系.原位拉曼光谱与理论计算结果表明,施加磁场可显著提高自旋密度,改善催化剂的3d电子与*O自由基的2p轨道之间的自旋相互作用,从而有效降低速率决定步骤(*O→*OOH)的能量障碍,进而促进O-O的形成.

关键词： high-entropy alloy magnetic permeability magnetic field spin arrangement oxygen evolution reaction