检索结果-南通市图书馆

Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第8期48卷 140-152页

作者： Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie Bao Yu Bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie Liu Shubin Liu Ze Long Guangyuan Luan changjun ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu Xuan Wu Likun Xie Xiaoyun Yang Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Luping Zhou Zhihao Zhou Kejun Zhu Institute of Modern Physics Fudan UniversityShanghai 200433China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Sate Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China 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 State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power *** neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 *** Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 *** neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy *** the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,*** the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,*** results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 *** total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 *** results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关键词： ^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber

中国散裂中子源伴生质子辐照实验平台及其技术参数的确定

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代应用物理 2024年第2期15卷 94-102页

作者：谭志新敬罕涛樊瑞睿黄良生蒋伟李强何泳成王林于永积宁常军黄蔚玲邱瑞阳曾磊孙晓阳曹秀霞马娜李论散裂中子源科学中心加速器技术部广东东莞523803 中国科学院高物理研究所东莞研究部北京100049

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(China Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测... 详细信息

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(China Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测量、束斑照相、同位素活化法等实验方法对伴生质子辐照实验平台的主要参数进行了刻度。实验证实,该辐照平台可以提供的质子能量范围为10~80 MeV,束斑分布均匀,束流强度范围为1.2×10^(7)~4.0×10^(9) cm^(-2)·s^(-1)。伴生质子辐照实验平台运行稳定,每年提供超过5000 h的束流时间,可以满足宇航器件可靠性测试、探测器刻度、辐照育种以及材料抗辐照特性测试等多种应用需求。

关键词：中国散裂中子源伴生质子束负氢离子能量刻度参数测试

在线全文

学校读者我要写书评

暂无评论

帕金森病深部脑刺激术后继发双相障碍1例

中华精神科杂志 2024年第4期57卷 229-233页

作者：滕昌军朱海涛章文斌张宁南京医科大学附属脑科医院医学心理科南京210029 南京医科大学附属脑科医院神经外科南京210029

深部脑刺激(deep brain stimulation,DBS)是目前帕金森病的一种常见手术治疗手段,术后患者可能出现新的情绪及行为问题。本文通过报道1例帕金森病老年患者在DBS术后出现双相障碍的个案,提示临床医生应加强对该类患者的关注和干预。同时... 详细信息

深部脑刺激(deep brain stimulation,DBS)是目前帕金森病的一种常见手术治疗手段,术后患者可能出现新的情绪及行为问题。本文通过报道1例帕金森病老年患者在DBS术后出现双相障碍的个案,提示临床医生应加强对该类患者的关注和干预。同时,我们结合文献对丘脑底核的神经功能进行分析和讨论,对丘脑底核在帕金森病及双相障碍中的神经病理机制进行思考和探索,促进DBS更好应用于临床。

关键词：帕金森病深部脑刺激双相情感障碍丘脑底核

Analysis of the Crosstalk in WDM Systems Caused by Cross-phase Modulation in Erbium-doped Fiber Amplifiers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2001年第5期 41-45页

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

The crosstalk in WDM systems caused by cross phase modulation (XPM) in erbium doped fiber amplifiers(EDFA) was studied analytically. The results confirm that the EDFA induced phase shift does cause crosstalk in WDM systems. The crosstalk between two channels both with modulated pulse signals is studied for the first time. It was found that the EDFA induced phase shift will cause serious deterioration of the eye diagram when the optical signals continue to travel in the normal dispersion regime of the transmission fiber, while in the anomalous dispersion regime this phase shift will not cause much deterioration of the eye diagram.

关键词： optical fiber amplifier optical communication cross phase modulation WDM

CSNS-Ⅱ靶站质子束窗结构设计与优化分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

强激光与粒子束 2023年第12期35卷 82-88页

作者：王广源刘磊刘仁洪康玲张俊嵩宁常军余洁冰陈佳鑫中国科学院高能物理研究所北京100049 散裂中子源科学中心广东东莞523803

中国散裂中子源(CSNS)靶站质子束窗位于环到靶站输运线(RTBT)与靶站交接面,起到隔离加速器高真空和靶站氦气环境的作用。随着束流功率提高,目前质子束窗单层膜结构形式已无法满足CSNS-Ⅱ500 kW的高功率需求,因此开展CSNS-Ⅱ质子束窗研制... 详细信息

中国散裂中子源(CSNS)靶站质子束窗位于环到靶站输运线(RTBT)与靶站交接面,起到隔离加速器高真空和靶站氦气环境的作用。随着束流功率提高,目前质子束窗单层膜结构形式已无法满足CSNS-Ⅱ500 kW的高功率需求,因此开展CSNS-Ⅱ质子束窗研制,设计出双层膜中间通水的冷却结构,完成质子束窗双层膜的薄膜半径、薄膜厚度、水冷槽长度与宽度、对流换热系数等各参数对质子束窗温升与热应力的影响分析。通过冷却水需求分析得出,冷却水流速需大于15 L/min。通过质子束窗主体的流固耦合分析,消除箱体内部死水区域。最终优化后质子束窗薄膜位置最高温度47.8℃,薄膜位置最高热应力30.758 MPa。通过FLUKA软件对质子束窗材料的辐照损伤性能进行分析,在每年5000 h工作时长、500 kW高功率束流的辐照下,辐照损伤DPA计算值为1.285 DPA,质子束窗的安全使用寿命在7年以上。

关键词：质子束窗热分析流固耦合分析辐照损伤

In situ synthesis of a spherical covalent organic framework as a stationary phase for capillary electrochromatography

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2022年第4期12卷 610-616页

作者： ning He Zhentao Li changjun Hu Zilin Chen Department of Orthopedics Trauma and Microsurgery Zhongnan Hospital of Wuhan UniversitySchool of Pharmaceutical SciencesWuhan UniversityWuhan430072China Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of EducationHubei Province Engineering and Technology Research Center for Fluorinated PharmaceuticalsWuhan430071China

Covalent organic frameworks(COFs)are a novel type of crystalline porous organic polymer materials recently *** has several advantages in chromatographic separation field,such as high thermal stability,porosity,structural regularity,and large specific surface ***,a novel spherical COF 1,3,5-tris(4-aminophenyl)benzene(TAPB)and 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarboxaldehyde(BPTA)was developed as an electrochromatographic stationary phase for capillary electrochromatography *** COF TAPB-BPTA modified capillary column was fabricated via a facile in situ growth method at room *** characterization results of scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)spectroscopy,and X-ray diffraction(XRD)confirmed that COF TAPB-BPTA were successfully modified onto the capillary inner *** electrochromatography separation performance of the COF TAPB-BPTA modified capillary was *** prepared column demonstrated outstanding separation performance toward alkylbenzenes,phenols,and chlorobenzenes ***,the baseline separations of non-steroidal anti-inflammatory drugs(NSAIDs)and parabens with good efficiency and high resolution were ***,the prepared column possessed satisfactory precision of the intra-day runs(n=5),inter-day runs(n=3),and parallel columns(n=3),and the relative standard deviations(RSDs)of the retention times of tested alkylbenzenes were all less than 2.58%.Thus,this new COF-based stationary phase shows tremendous application potential in chromatographic separation field.

关键词： Covalent organic frameworks In situ growth method Capillary electrochromatography Electrochromatographic separation

中国散裂中子源反角白光中子源准直器的设计与测试

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原子能科学技术 2019年第12期53卷 2447-2453页

作者：于永积敬罕涛宁常军何泳成王鹏程唐靖宇康玲阮锡超任杰东莞中子科学中心广东东莞523803 中国科学院高能物理研究所北京100049 中国原子能科学研究院核数据重点实验室北京102413

为获得核数据测量所需的束斑形状及较低的实验本底,反角白光中子源需通过准直器对束流进行刮束准直。以中子开关为例,根据相关要求确定了整体的设计方案。通过将挡块一分为二的设计,解决了小直径深孔加工的难题。利用有限元分析软件,优... 详细信息

为获得核数据测量所需的束斑形状及较低的实验本底,反角白光中子源需通过准直器对束流进行刮束准直。以中子开关为例,根据相关要求确定了整体的设计方案。通过将挡块一分为二的设计,解决了小直径深孔加工的难题。利用有限元分析软件,优化了真空盒的外形结构及密封方式。针对挡块的工作环境,搭建了可用于真空的高精度耐辐射移动平台。经测试,中子开关的主要技术指标均满足要求,说明设计合理。

关键词：中国散裂中子源反角白光中子源白光中子束流准直器

Detector development at the Back-n white neutron source

在线全文

学校读者我要写书评

暂无评论

辐射探测技术与方法(英文) 2023年第2期7卷 171-191页

作者： Fan Ruirui Li Qiang Bao Jie Li Yang Liu Rong Jiang Wei Ren Jie Zhang Qiwei Cao Ping Gu Minhao Ren Zhizhou Yi Han Tang Jingyu An Qi Bai Haofan Bai Jiangbo Chen Qiping Chen Yonghao Chen Zhen Cui Zengqi Fan Anchuan Feng Changqing Feng Fanzhen Gao Keqing Han Changcai Han Zijie He Guozhu He Yongcheng Hong Yang Hu Yiwei Huang Hanxiong Jia Weihua Jiang Haoyu Jiang Zhijie Jin Zhengyao Kang Ling Li Bo Li Chao Li Gong Li Jiawen Li Xiao Liu Jie Liu Shubin Luan Guangyuan ning changjun Qi Binbin Ruan Xichao Song Zhaohui Sun Kang Tan Zhixin Tang Shengda Wang Pengcheng Wang Zhaohui Wen Zhongwei Wu Xiaoguang Wu Xuan Xie Likun Yang Yiwei Yu Yongji Zhang Guohui Zhang Linhao Zhang Mohan Zhang Xianpeng Zhang Yuliang Zhang Yue Zhang Zhiyong Zhao Maoyuan Zhou Luping Zhou Zhihao Zhu Kejun The CSNS Back-n Collaboration Institute of High Energy Physics CASBeijing 100049People’s Republic of China Spallation Neutron Source Science Center Dongguan 523803People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049People’s Republic of China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413People’s Republic of China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900People’s Republic of China Department of Modern Physics University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Particle Detection and Electronics Hefei 230026People’s Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026People’s Republic of China Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China 不详

Purpose Back-n is a white neutron beamline at China spallation neutron source,which was established in the year of *** is a powerful facility for nuclear data measurement,neutron detector calibration,and radiation effect *** A series of detectors were built for different experiments,including beam monitoring,beam profile measurement,neutron induced secondaries(fission fragments,light charged particles and gamma)cross section measurement,and neutron resonance radiography,etc.A common digitization electronics and a cluster-based DAQ were developed for these detector *** detectors have been employed at Back-n and serviced for experiments from the beginning of the beamline *** and conclusion As an overview of detectors of Back-n,the details of the detector design and the experiment performing are described in this *** developing systems,e.g.,MTPC and B-MCP,are also included.

关键词： White neutron source Beam diagnostics Fission fragment Charged particle Gamma Neutron resonance radiography

Development of a psychosocial functioning questionnaire for patients with major depressive disorder

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

General Psychiatry 2022年第1期35卷 26-33页

作者： Xiujuan Zhang Hua Yang Hui Ma changjun Teng Hui Wang Kaili Diao ning Zhang Department of Medical Psychology Nanjing Brain Hospital Affiliated to Nanjing Medical UniversityNanjingJiangsuChina

Background The importance of psychosocial functioning in the assessment,diagnosis and treatment of major depressive disorder(MDD)is widely ***,there is a lack of effective scales to assess psychosocial functioning in patients with *** To develop a professional questionnaire to evaluate the psychosocial functioning of patients with *** Using a literature review,an open-ended questionnaire survey,and patient interviews,a theoretical model of psychosocial functioning was constructed,and an initial questionnaire was formed which included four *** two rounds of testing,using items analysis and exploratory factor analysis,a finalized questionnaire was *** were 460 patients with MDD selected from six psychiatric hospitals for formal testing using a convenience sampling *** patients were randomly selected and retested one week later to evaluate the test-retest reliability of the *** Patient Health Questionnaire-9(PHQ-9),Short Form of Quality of Life Enjoyment and Satisfaction Questionnaire(Q-LES Q SF),Sheehan Disability Scale(SDS),and Dysfunctional Attitudes Scale(DAS)provided major standards to check the criterion validity of this *** analysis,confirmatory factor analysis,and internal consistency reliability testing were used to examine other psychometric characteristics of the finalized *** The Psychosocial Functioning Questionnaire(PFQ)for patients with MDD included three dimensions:psychological cognitive functioning,subjective well-being,and social functioning,with a total of 18 *** overall internal consistency reliability of the questionnaire was 0.957,and the test-retest reliability was *** factor analysis showed that the model fitted well:Goodness of Fit Index(GFI)=0.888;Root Mean SquareError of Approximation(RMSEA)=*** total score of PFQ was significantly correlated with the total score of PHQ-9,DAS,SDS and Q-LES Q SF(|r|=0.599-0.870,

关键词： patients testing validity