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10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang Li Li‑Jiao Wang jing‑Yu Tang xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu tao Li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Yi‑Na Liu Guang‑Yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou 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 Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China 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 North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China 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 Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China 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 China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

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Association of Pringle maneuver with postoperative recurrence and survival following hepatectomy for hepatocellular carcinoma: a multicenter propensity score and competing-risks regression analysis

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Hepatobiliary Surgery and Nutrition 2024年第3期13卷 412-424,I0003-I0010页

作者： Shi-Chuan Tang Yong-Kang Diao Kong-Ying Lin Chao Li Xiao Xu Lei Liang Jie Kong Qing-jing Chen xian-Ming Wang Fu-Bao Liu Wei-Min Gu Ya-Hao Zhou Ying-Jian Liang Hong-Zhi Liu Ming-Da Wang Lan-Qing Yao Timothy M.Pawlik feng Shen Wan Yee Lau Tian Yang Yong-Yi Zeng Department of Hepatobiliary Surgery Mengchao Hepatobiliary Hospital of Fujian Medical UniversityFuzhouChina Department of Hepatobiliary Surgery Eastern Hepatobiliary Surgery HospitalNavy Medical University(Second Military Medical University)ShanghaiChina Department of Hepatobiliary Surgery Affiliated Hospital of Nantong UniversityNantongChina Department of Hepatobiliary Surgery People’s Hospital of Zhejiang ProvincialPeople’s Hospital of Hangzhou Medical CollegeHangzhouChina Department of Hepatobiliary Heze Municiple HospitalHezeChina Department of General Surgery First Affiliated Hospital of Shandong First Medical University&Shandong Provincial Qianfoshan HospitalJinanChina Department of Hepatobiliary Surgery First Affiliated Hospital of Anhui Medical UniversityHefeiChina The First Department of General Surgery Fourth Hospital of HarbinHarbinChina Department of Hepatobiliary Surgery Pu’er People’s HospitalPu’erChina Department of Hepatobiliary Surgery First Affiliated Hospital of Harbin Medical UniversityHarbinChina Department of Surgery Ohio State UniversityWexner Medical CenterColumbusOHUSA Faculty of Medicine The Chinese University of Hong KongHong KongChina Department of Hepatopancreatobiliary Surgery First Affiliated Hospital of Fujian Medical UniversityFuzhouChina The Liver Disease Research Center of Fujian Province FuzhouChina

Background:The application of Pringle maneuver(PM)during hepatectomy reduces intraoperative blood loss and the need for perioperative transfusion,but its effect on long-term recurrence and survival for patients with hepatocellular carcinoma(HCC)remains *** sought to determine the association between the application of PM and post-hepatectomy oncologic outcomes for patients with ***:Patients who underwent curative hepatectomy for HCC at 9 Chinese hospitals from January 2010 to December 2018 were *** two propensity score methods[propensity score matching(PSM)and inverse probability of treatment weight(IPTW)],cumulative recurrence rate and cancer-specific mortality(CSM)were compared between the patients in the PM and non-PM *** competing-risks regression models were performed to adjust for the effect of non-cancer-specific mortality and other prognostic risk ***:Of the 2,798 included patients,2,404 and 394 did and did not adopt PM(the PM and non-PM groups),*** rates of intraoperative blood transfusion,postoperative 30-day mortality and morbidity were comparable between the two groups(all P>0.05).In the PSM cohort by the 1:3 ratio,compared to 382 patients in the non-PM group,1,146 patients in the PM group also had the higher cumulative 5-year recurrence rate and CSM(63.9%and 39.1%vs.55.3%and 31.6%,both P<0.05).Similar results were also yielded in the entire cohort and the IPTW *** competing-risks regression analyses demonstrated that no application of the PM was independently associated with lower recurrence rate and CSM based on various analytical cohorts[hazard ratio(HR),0.82 and 0.77 in the adjusted entire cohort,HR 0.80 and 0.73 in the PSM cohort,and HR 0.80 and 0.76 in the IPTW cohort,respectively].Conclusions:The findings suggested that no application of PM during hepatectomy for patients with HCC reduced the risk of postoperative recurrence and cancer-specific death by appr

关键词： Hepatocellular carcinoma(HCC) Pringle maneuver(PM) recurrence survival hepatectomy

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DMI−LiNO3离子液体类似物室温电沉积钕铁硼薄膜

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Transactions of Nonferrous Metals Society of China 2024年第6期34卷 2034-2044页

作者：鲁小青刘爱民刘风国胡宪伟石忠宁东北大学多金属共生矿生态化冶金教育部重点实验室沈阳110819 东北大学冶金学院沈阳110819

研究1,3-二甲基-2-咪唑啉酮(DMI)−LiNO_(3)离子液体类似物在室温条件下电沉积钕铁硼薄膜的可行性和反应机理。结果表明,循环伏安曲线中−1.83 V(vs Ag)处的还原峰对应于Fe(II)被还原为金属Fe,−2.01 V(vs Ag)处的还原峰对应于B(III)被还原... 详细信息

研究1,3-二甲基-2-咪唑啉酮(DMI)−LiNO_(3)离子液体类似物在室温条件下电沉积钕铁硼薄膜的可行性和反应机理。结果表明,循环伏安曲线中−1.83 V(vs Ag)处的还原峰对应于Fe(II)被还原为金属Fe,−2.01 V(vs Ag)处的还原峰对应于B(III)被还原为B。Fe(II)和B(III)的电化学还原反应是受扩散控制的不可逆过程,313 K下Fe(II)和B(III)的扩散系数分别为3.03×10^(−6)和6.74×10^(−7) cm^(2)/s。此外,XRD分析表明,在DMI−LiNO_(3)−Nd(CF_(3)SO_(3))_(3)−FeCl_(2)−H_(3)BO_(3)体系中以铝为基底电沉积2 h的产物含有NdFe_(3)B_(3);SEM和EDS分析表明,阴极产物中Nd、Fe和B元素呈均匀分布;XPS分析表明,钨基底表面中Nd、Fe和B的质量分数分别为27.44%、27.90%和7.51%。

关键词：离子液体类似物电沉积钕铁硼薄膜循环伏安法

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基于极限梯度提升的完美匹配单层智能算法实现航空瞬变电磁问题高效吸收

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物理学报 2024年第6期73卷 241-249页

作者：冯乃星王欢朱子贤董纯志李宏杨张玉贤杨利霞黄志祥安徽大学电子信息工程学院合肥230601 安徽大学智能计算与信号处理教育部重点实验室合肥230601

对于航空瞬变电磁的低频探地问题,除了精度和效率需要考虑,深地探测问题的复杂度也不容忽视,特别是对于低频复杂问题存在异常体与背景间的多尺度效应.为了模拟开域问题,有限厚度区域的完全匹配层被用于截断计算域,然而这也无形中增大了... 详细信息

对于航空瞬变电磁的低频探地问题,除了精度和效率需要考虑,深地探测问题的复杂度也不容忽视,特别是对于低频复杂问题存在异常体与背景间的多尺度效应.为了模拟开域问题,有限厚度区域的完全匹配层被用于截断计算域,然而这也无形中增大了整个模型,造成计算复杂度增加.鉴于此,提出了一种新的基于极限梯度提升(extreme gradient boosting,XGB)的完美匹配单层模型,并将该模型集成到时域有限差分求解器中,以进一步提高时域有限差分仿真的性能.所提出的基于XGB的完美匹配单层模型通过特征注意力集成学习方法可以获得更高的精度,同时占用更少的内存、消耗更少的时间.此外,由于该模型依托于传统机器学习模型,因此它在模型训练的稳定性和轻量级方面具有显著的优势.最后,通过对航空瞬变电磁应用进行三维数值模拟,验证了该方法的有效性和稳定性.该模型不仅在精度、效率和问题复杂性方面具有优势,而且还可以成功地集成到时域有限差分求解器中,解决低频航空瞬变电磁问题.

关键词：极限梯度提升完美匹配单层机器学习时域有限差分

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基于公平性与效率的广西基层卫生资源配置空间相关分析

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现代预防医学 2024年第1期51卷 88-92页

作者：刘佩芸黄同慧康静黄凌波朱晨婷冯启明覃娴静广西医科大学卫生与健康政策研究中心(广西高端智库建设培育单位) 广西医科大学信息与管理学院

目的测度2021年广西基层卫生资源配置的公平性及效率，并在此基础上探讨其空间自相关格局。方法运用集聚度和数据包络分析法分析广西基层卫生资源配置公平性与效率，并利用空间自相关方法研究其公平性与效率的空间分布特征。结果 202... 详细信息

目的测度2021年广西基层卫生资源配置的公平性及效率，并在此基础上探讨其空间自相关格局。方法运用集聚度和数据包络分析法分析广西基层卫生资源配置公平性与效率，并利用空间自相关方法研究其公平性与效率的空间分布特征。结果 2021年，广西各地市的基层卫生资源集聚度分布在0.451～2.961之间；14个地市中仅有4市基层卫生资源配置效率为DEA有效；基层卫生资源配置公平性和效率(除规模效率外)均存在一定的空间聚集效应。结论广西区域内部的基层卫生资源配置公平性和效率均存在较大差距，除规模效率外的其他指标不同程度地呈现为空间差异化分布。建议广西强化全局规划功能，在考虑空间自相关性的前提下促进地区间基层卫生资源合理配额与优势互补。

关键词：基层卫生资源公平性效率空间自相关

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流动性创造、法定数字货币与银行风险承担

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改革 2024年第5期 124-136页

作者：谢星李颖封思贤南京财经大学金融学院南京师范大学商学院金陵女子学院

将法定数字货币引入DLM模型,阐述其对银行流动性创造及其风险承担的作用机理,并基于我国171家商业银行的非平衡面板数据进行实证检验。结果发现:流动性创造水平与银行风险承担之间呈U型关系;法定数字货币总体上降低了银行的风险承担水平... 详细信息

将法定数字货币引入DLM模型,阐述其对银行流动性创造及其风险承担的作用机理,并基于我国171家商业银行的非平衡面板数据进行实证检验。结果发现:流动性创造水平与银行风险承担之间呈U型关系;法定数字货币总体上降低了银行的风险承担水平,且对上述U型关系起调节作用,其中法定数字货币作为金融监管工具时的调节效应强于作为金融基础设施工具时的效应;银行数字化水平越高,法定数字货币的调节作用越显著。这些发现可为我国央行进一步优化法定数字货币设计、调控银行流动性创造水平、帮助银行降低风险承担水平提供重要参考。

关键词：法定数字货币流动性创造银行风险承担 DLM模型

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重庆市20岁以上人群骨质疏松症知识调查

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中华骨质疏松和骨矿盐疾病杂志 2024年第1期17卷 25-32页

作者：李灿谢杨丽陈涵纲杨京苏楠罗凤涛陈波杨弦弦谭乔燕陈林陆军军医大学大坪医院骨质疏松与骨发育中心/战伤组织修复与康复医学研究室/创伤与化学中毒全国重点实验室重庆400042 重庆市疾病预防控制中心慢病所重庆400042

目的了解重庆市20岁以上居民对骨质疏松症的认知情况。方法对中国重庆市居民采用多阶段分层整群随机抽样方法,抽取768名男性和1083名女性,年龄在20~87岁之间,填写基本信息和骨质疏松症知识评估工具(osteoporosis knowledge assessment t... 详细信息

目的了解重庆市20岁以上居民对骨质疏松症的认知情况。方法对中国重庆市居民采用多阶段分层整群随机抽样方法,抽取768名男性和1083名女性,年龄在20~87岁之间,填写基本信息和骨质疏松症知识评估工具(osteoporosis knowledge assessment tool,OKAT)问卷,统计及分析被调查者对骨质疏松症相关知识知晓率情况,使用骨质疏松症自我评估筛查工具(osteoporosis self-assessment screening tool for Asians,OSTA)评估绝经后女性骨质疏松症风险,采用双能X线吸收法(dual-energy X-ray absorptiometry,DXA)对被调查者进行骨密度测量。结果重庆市20岁以上居民对骨质疏松症相关知识知晓率为12.8%,其中男性与女性的知晓率分别为11.3%和13.9%。骨质疏松症相关知识知晓率随着年龄的增长而下降(<45岁29.3%,45~54岁18.6%,55~64岁13.9%,≥65岁11.4%;P<0.001)。在各年龄段中,城市地区人群知晓程度高于农村地区人群(P<0.05)。此外,绝经后妇女的骨质疏松症知识知晓率为9.1%。结论重庆市居民骨质疏松症相关知识知晓率均较低,尤其是农村地区居民及绝经后妇女,有必要加强骨质疏松症的公共教育和健康宣传。

关键词：重庆骨质疏松症知识骨质疏松症风险

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Dynamic Behaviors of Hydrogen in Martensitic T91 Steel Evaluated by Using the Internal Friction Method

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Chinese Physics Letters 2013年第4期30卷 141-144页

作者： HU jing WANG xian-Ping Zhuang zhong ZHANG tao FANG Qian-feng LIU Chang-Song Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031

Hydrogen atoms are electrochemically introduced into commercial martensitic T91 steel,and the hydrogen dynamic behaviors are investigated by internal friction(IF)technology.A complex spectrum with multicomponent peaks is detected in the hydrogen-charged T91 steel in the temperature range of 135–290 *** of peak configuration reveals that the multicomponent peaks consist of one relaxational peak and two non-relaxational *** mechanism of the wide relaxational component is ascribed to the combination of a hydrogen Snoek-like diffusion process and the interaction of hydrogen with movable dislocations,while the two non-relaxational peaks are preliminarily suggested to be caused by some kinds of transient processes related with hydrogen redistribution and *** binding energy of hydrogen to dislocation is determined to be about 0.19 eV.

关键词： steel friction martensitic

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Fiber-like micelle with a p-conjugated polymer core: a potential building block for organic electronics

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Science Bulletin 2017年第18期62卷 1229-1230页

作者： xian Yang Yinan Cui Chun feng Daliao tao Xiaoyu huang Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

The self-assembly of block copolymer in solution are constantly expanding,in part because of the increasing degree of control over the size,morphology and functionality of self-assembled nanostructures that can be exerted by the introduction of additional driven force such as hydrogen-bonding,halogen bonding,p-p stacking,host-guest complexation,metal-coordination,electrostatic interaction and crystalline[1].Among these,the

关键词：纳米胶束共轭聚合物电子学纤维状主客体相互作用嵌段共聚物自组装控制程度

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In-beam gamma rays of CSNS Back-n characterized by black resonance filter

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NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-12页

作者： Wang, Jin-Cheng Ren, Jie Jiang, Wei Ruan, Xi-Chao Liu, Ying-Yi Yang, Hao-Lan Xu, Kuo-Zhi Pan, Xin-Yi Sun, Qi Bao, Jie huang, Han-Xiong Bai, Hao-Fan Bai, Jiang-Bo Cao, Ping Chen, Qi-Ping Chen, Yong-Hao Duan, Wen-Hao Fan, An-Chuan Fan, Rui-Rui feng, Chang-Qing Gu, Min-Hao Han, Chang-Cai Han, Zi-Jie He, Guo-Zhu He, Yong-Cheng Hong, Yang Hu, Yi-Wei Jiang, Zhi-Jie Kang, Ling Lan, Chang-Lin Li, Bo Li, feng Li, Qiang Li, Xiao Li, Yang Liu, Jie Liu, Rong Liu, Shu-Bin Liu, Yi-Na Luan, Guang-Yuan Ning, Chang-Jun Qiu, Yi-Jia Ren, Wen-Kai Ren, Zhi-Zhou Song, Zhao-Hui Sun, Kang Tan, Zhi-Xin Tang, jing-Yu Tang, Sheng-Da Wang, Li-Jiao Wang, Peng-Cheng Wang, Zhao-Hui Wen, zhong-Wei Wu, Xiao-Guang Wu, Xuan Wu, Ze-Peng Xia, Cong Xie, Li-Kun Yi, Han Yu, tao Yu, Yong-Ji Zhang, Guo-Hui Zhang, Hang-Chang Zhang, Qi-Wei Zhang, xian-Peng Zhang, Yu-Liang Zhang, Zhi-Yong Zhao, Mao-Yuan Zhou, Zhi-Hao Zhu, Ke-Jun Zou, Chong China Inst Atom Energy Key Lab Nucl Data Beijing 102413 Peoples R China Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China Spallat Neutron Source Sci Ctr Dongguan 523803 Peoples R China Chinese Acad Sci Inst High Energy Phys State Key Lab Particle Detect & Elect Beijing 100049 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Peking Univ Sch Phys State Key Lab Nucl Phys & Technol Beijing 100871 Peoples R China Fudan Univ Inst Modern Phys Shanghai 200433 Peoples R China Univ Sci & Technol China State Key Lab Particle Detect & Elect Hefei 230026 Peoples R China Univ Sci & Technol China Sch Nucl Sci & Technol Hefei 230026 Peoples R China Univ Sci & Technol China Dept Modern Phys Hefei 230026 Peoples R China China Acad Engn Phys Inst Nucl Phys & Chem Mianyang 621900 Peoples R China Univ Sci & Technol China USTC Archaeometry Lab Hefei 230026 Peoples R China Northwest Inst Nucl Technol Xian 710024 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China Univ Sci & Technol China Inst Adv Technol Hefei 230027 Peoples R China

The back-streaming white-neutron beamline (Back-n) of the China Spallation Neutron Source is an essential neutron- research platform built for the study of nuclear data, neutron physics, and neutron applications. Many types of cross-sectional neutron-reaction measurements have been performed at Back-n since early 2018. These measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron beam. These gamma rays, commonly referred to as in-beam gamma rays, can induce a non-negligible experimental background in neutron-reaction measurements. Studying the characteristics of in-beam gamma rays is important for understanding the experimental background. However, measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons; thus, discriminating between neutron-induced signals and those from in-beam gamma rays is difficult. In this study, we propose the use of the black resonance filter method and a CeBr3 scintillation detector to measure the characteristics of the in-beam gamma rays of Back-n. Four types of black resonance filters, Ta-181, Co-59, Ag-nat, and Cd-nat, were used in this measurement. The time-of-flight (TOF) technique was used to select the detector signals remaining in the absorption region of the TOF spectra, which were mainly induced by in-beam gamma rays. The energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the CeBr3 scintillation detector and using Monte Carlo simulations. Based on the results of this study, the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated, which is beneficial for enhancing both the experimental methodology and data analysis.

关键词： In-beam gamma rays Back-n Black filter resonance technique In-beam gamma rays Back-n CeBr3 scintillator Black filter resonance technique C6D6 DETECTOR SYSTEM LINE

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