检索结果-南通市图书馆

Hall sensor angle error and relative position calibrations for cryogenic permanent magnet undulator of high energy photon source test facility(HEPS-TF)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2017年第2期1卷 65-70页

作者： Ling-Ling Gong Wan chen Wen Kang shu-chen sun Zhi-Qiang Li Lei Zhang Yu-Feng Yang Hui-Hua Lu Xiao-Yu Li shu-Tao Zhao Xiang-Zhen Zhang Ya-Jun sun Laboratory of Particle Acceleration Physics and Technology Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science Beijing 100049China China Spallation Neutron Source(CSNS) Institute of High Energy Physics(IHEP)Chinese Academy of Sciences(CAS)Dongguan 523803China Dongguan Institute of Neutron Science(DINS) Dongguan 523808China

Purpose A new in-vacuum three-dimensional Hall probe magnetic measurement system is under fabrication for characterizing the magnetic performance of the Cryogenic Permanent Magnet Undulator(CPMU).In order to fit the small gap(5 mm)of magnetic structure and vacuum environment,a small three-dimensional Hall probe has been *** angular and positional misalignment errors of the Hall sensors play an important role in the measurement accuracy of the *** order to minimize the misalignment errors,a method of calibrating angle error and relative assembly displacements of a three-dimensional Hall probe is carried *** The angle error of Hall sensors will be calibrated by a standard dipole magnet and a five-dimensional Hall *** standard dipole magnet will generate a single direction and uniform magnetic *** the fivedimensional Hall bench is used to rotate the Hall probe which is put in the center of *** on the relationship between angle and magnetic field strength,the angle error of each Hall sensor will be *** relative position between the sensitive areas of the Hall sensors will be calibrated by a two-dimensional magnetic field undulator *** on Maxwell’s equations,through the calculation of measurement magnetic field strength,the relative assembly displacements of the three Hall sensors can be *** The details of the calibration methods and the data processing of angle error and relative assembly displacements of a three-dimensional Hall probe are *** three-dimensional magnetic fields of a cryogenic permanent magnet undulator can be received accurately by correcting these angle errors and position errors of Hall *** This paper illustrates the relative position and angle calibration procedures and the data processing of a three-dimensional Hall *** the design of a smaller Hall probe is in *** calibration of the angle errors and position errors will be carried out

关键词： Magnetic measurement system Cryogenic permanent magnet undulator Three-dimensional Hall probe Calibration of Hall probe

Single-blockmeasurement for the cryogenic permanent magnet undulator sorting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第1期5卷 83-89页

作者： Ling-Ling Gong Xiao-Yu Li Yu-Hui Li Ya-Jun sun Hui-Hua Lu Ke-yun Gong Qing Guo·shu-chen sun Zhi-qiang Li Wan chen Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The magnet sorting is a standard step in the undulator fabrication *** shortest undulators period used in the High Energy Photon Source(HEPS)is only 12 *** the short period undulator,the sorting may be more important than the long-period ***,the Helmholtz measurement is used as the input for the *** is the averaged orthogonal magnetization of each *** order to investigate whether the Helmholtz coil measurement is enough for the sorting,a careful study has been *** Firstly,a magnetic camera was used to scan the 3D surface field of a ***,its field integral ismeasured by the stretched *** the measurement,the magnetwas placed at different *** results were checked to seewhether they are consistent with expected features supposing a homogeneous magnetized ***,the results measured by the Helmholtz coil and the stretched wire were *** The surface field scan demonstrates that the field over a magnet block is ***,the field integral measurement by the stretched wire also shows big difference when the different magnet sides toward *** comparison between the stretched wire and the Helmholtz coil measurement shows no *** The study presented in this paper reveals that the homogeneity of the magnetization is ***,the Helmholtz coil data are insufficient to the short-period undulators sorting.

关键词： Magnet sorting Undulator Stretched wire Helmholtz coil

Magnetic field strength and temperature-dependent calibration system of Hall probe for the HEPS-TF cryogenic permanent magnet undulator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2018年第1期2卷 128-135页

作者： Ling-Ling Gong Wan chen Wen Kang Lei Zhang Xiang-Zhen Zhang shu-chen sun Fu-San chen Lei Wu Ya-Jun sun Zhi-Qiang Li Yu-Feng Yang Hui-Hua Lu Xiao-Yu Li shu-Tao Zhao Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Spallation Neutron Source(CSNS) Institute of High Energy Physics(IHEP)Chinese Academy of Sciences(CAS)Dongguan 523803China Dongguan Institute of Neutron Science(DINS) Dongguan 523808China

Purpose High energy photon source test facility(HEPS-TF)has manufactured a three-dimensional Hall probe to measure the cryogenic permanent magnet undulator(CPMU).Since the operating environment of the CPMU is the subcooled liquid nitrogen(85K),the temperature of the Hall probe will have a decrease of several degrees while carrying out the local magnetic *** established a magnetic field strength and temperature-dependent calibration system to calibrate the Hall *** The magnetic field strength of the Hall probe was calibrated by a standard dipole electromagnet and a nuclear magnetic resonance Tesla meter(NMR).The temperature of Hall probe was controlled by a control system which can modulate temperature from 0℃ to 30℃.Results A new homemade Hall probe has finished the temperature-dependent(0℃ to 30℃),magnetic field strength(-1.2 to 1.2 T)and angle error calibration at this new calibration *** temperature correction error is less than 0.045%.The calibration error of magnetic field strength is less than 1.5 *** RMS calibration error of Hall sensors angle matrix is less than *** The magnetic field strength and temperature-dependent calibration system including a standard dipole electromagnet,a temperature regulation system,an NMR and a five-dimensional Hall bench was *** detailed magnetic field strength and temperature-dependent calibration system is introduced and the results of the calibrations are presented.

关键词： Temperature calibration Cryogenic permanent magnet undulator Three-dimensional Hall probe Nuclear magnetic resonance Tesla meter

Influence of cryogenic permanent magnet undulator motion error on magnetic field error and radiation intensity loss

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2018年第1期2卷 200-206页

作者： shu-chen sun Wei-Fan Sheng Hui-Hua Lu Xiao-Yu Li shu-Tao Zhao Ling-Ling Gong Wan chen Zhi-Qiang Li Lei Zhang Yu-Feng Yang Xiang-Zhen Zhang Ya-Jun sun Laboratory of Particle Acceleration Physics&Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science Beijing 100049China

A cryogenic permanent magnet undulator prototype designed for Chinese High Energy Photon Source Test Facility(HEPSTF)at Institute of High Energy Physics is constructed and now *** precision of girders is a significant parameter to guarantee gap error so as to avoid phase error and radiation intensity *** order to study and minimize girder parallelism errors,RADIA and SPECTRA are used to calculate qualified motion *** Modules and single motor closed-loop feedback are designed to compensate the *** field is finally tuned to reach *** of the study and analysis will be presented in this paper.

关键词： Motion precision test Cryogenic permanent magnet undulator Phase error Radiation intensity

Finite-temperature ductility-brittleness and electronic structures of Al_(n)Sc(n=1,2 and 3)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3974-3989页

作者： Xue-Qian Wang Ying Zhao Hao-Xuan Liu shu-chen sun Hong-Bo Yang Jia-Min Zhong Gan-Feng Tu Song Li Yu-Dong Zhang Claude Esling Hai-Le Yan Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiong'an 071700China Laboratoire d'étude des Microstructures et de Mécanique des Matériaux(LEM3) Unikersitéde Lorraine57045MetzFrance

Finite-temperature ductility-brittleness and electronic structures of Al_(3)Sc,Al_(2)Sc and AlSc are studied comparatively by first-principles calculations and ab initio molecular *** show that Al_(3)Sc and Al_(2)Sc are brittle at both ground state and finite temperatures,while AlSc possesses a significantly superior *** ground state,AlSc is ductile from Pugh's and Poisson's criteria,while it is brittle in Pettifor's *** ductility of all Al_(3)Sc,Al_(2)Sc and AISc improves greatly with the elevated ***,the Cauchy pressure of AlSc undergoes a transition from negative to *** T>600 K,AlSc is unequivocally classified as ductile from all criteria *** all compounds,the Al-Al bond originated from s-p and p-p orbital hybridizations,and the Al-Sc bond dominated by p-d covalent hybridization,are the first and second strongest chemical bonds,*** explain the difference in mechanical properties,the mean bond strength(MBS)is introduced in this *** weaker Al-Al bond in AlSc,leading to a smaller MBS,could be the origin of the softer elastic stiffness and superior intrinsic *** longer length of the Al-Al bond in AlSc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional *** longer length of the Al-Al bond in AISc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional ductility.

关键词： Al-Sc Target materials Intrinsic ductility Finite-temperature elastic constant First-principles calculation

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

论行政主体防灾减灾义务的法律构建

河北法学 2011年第12期29卷 88-93页

作者：陈书笋华东政法大学上海200042

国家"十二五"规划提出了加强"防灾减灾体系建设"的任务。在进行防灾减灾体系建设时,比较容易忽视的就是对行政主体的防灾减灾义务的规定。而行政主体防灾减灾义务的履行程度是衡量行政主体管理水平的重要指标,从这一角度来讲,对行政主... 详细信息

国家"十二五"规划提出了加强"防灾减灾体系建设"的任务。在进行防灾减灾体系建设时,比较容易忽视的就是对行政主体的防灾减灾义务的规定。而行政主体防灾减灾义务的履行程度是衡量行政主体管理水平的重要指标,从这一角度来讲,对行政主体的防灾减灾义务进行法律构建具有积极的理论和现实意义。通过对行政主体承担防灾减灾义务的法理基础、防灾减灾义务的范畴等的探讨,进一步提出行政主体防灾减灾义务的法律构建框架。

关键词：防灾减灾义务法律构建

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

电传动履带车辆驱动系统建模与转向特性研究

系统仿真学报 2006年第10期18卷 2815-2818页

作者：陈树勇孙逢春北京理工大学机械与车辆工程学院北京理工大学机械与车辆工程学院北京100081

为准确分析某电传动履带车辆转向特性,运用现代设计理论与方法—协同仿真与虚拟样机技术,借助动力学分析软件RecurDyn/Track-HM和控制系统分析软件Matlab/Simulink仿真平台,建立了整车行动部分三维多体动力学模型和控制系统模型。以不... 详细信息

为准确分析某电传动履带车辆转向特性,运用现代设计理论与方法—协同仿真与虚拟样机技术,借助动力学分析软件RecurDyn/Track-HM和控制系统分析软件Matlab/Simulink仿真平台,建立了整车行动部分三维多体动力学模型和控制系统模型。以不同车速v、不同转向半径R下的转向特性为例,对其进行了理论分析与协同仿真分析,并通过与理论计算和试验结果对比验证了模型的正确性。该方法对深入了解整车的转向特性以及试验调试策略具有重要指导意义,可进一步缩短研制周期,降低研究成本,同时为履带车辆电驱动系统动态特性的深入研究提供了一条新的思路。

关键词：电传动履带车辆协同仿真转向特性 RecurDyn

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

模拟酸雨对次生林土壤呼吸及异养呼吸的影响

环境科学 2017年第3期38卷 1235-1244页

作者：陈书涛孙鹭桑琳胡正华南京信息工程大学江苏省大气环境与装备技术协同创新中心南京210044 南京信息工程大学应用气象学院南京210044

为研究模拟酸雨对次生林土壤呼吸及异养呼吸的影响,进行野外定位试验.设置裂区试验,分4个区组,每个区组中主区为不断根和挖沟断根小区,每个主区内设置对照(CK)、pH 4.0(A1)、pH 3.0(A2)、pH 2.0(A3)共4个模拟酸雨处理水平.观测不断根小... 详细信息

为研究模拟酸雨对次生林土壤呼吸及异养呼吸的影响,进行野外定位试验.设置裂区试验,分4个区组,每个区组中主区为不断根和挖沟断根小区,每个主区内设置对照(CK)、pH 4.0(A1)、pH 3.0(A2)、pH 2.0(A3)共4个模拟酸雨处理水平.观测不断根小区的土壤呼吸和断根小区的异养呼吸,同时观测土壤温度、土壤湿度.结果表明,在不断根小区,CK、A1、A2、A3处理的土壤呼吸均表现出明显的季节变异趋势;与不断根小区类似,断根小区的异养呼吸也具有明显的季节变异趋势.断根小区的异养呼吸明显低于不断根小区的土壤呼吸.CK、A1、A2、A3处理的年平均土壤呼吸速率分别为(2.47±0.31)、(2.52±0.22)、(2.38±0.17)、(2.43±0.22)μmol·(m^2·s)^(-1);断根小区CK、A1、A2、A3处理的年平均异养呼吸速率分别为(1.55±0.10)、(1.65±0.22)、(1.77±0.08)、(1.78±0.27)μmol·(m^2·s)^(-1).单因素方差分析表明,不断根小区不同模拟酸雨处理之间的土壤呼吸速率以及断根小区不同模拟酸雨处理的异养呼吸速率均无显著差异.回归分析表明,不断根小区的土壤呼吸与断根小区的异养呼吸之间存在极显著(P<0.001)的正比例函数关系,模拟酸雨的添加降低了土壤呼吸与异养呼吸之比.土壤温度是决定不断根小区土壤呼吸和断根小区异养呼吸季节变异的最主要的因素,而土壤湿度对土壤呼吸和异养呼吸的季节变异无显著的影响.

关键词：模拟酸雨次生林土壤呼吸异养呼吸土壤温度

维普期刊数据库

Efficacy and safety of Tripterygium wilfordii glycosides tablets combined with Western medicine for patients with rheumatic immune diseases

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第6期13卷 14-23页

作者： Hang shu Xiao-Yu chen Jie Zhao Pin Li Zhen sun Department of Traditional Chinese Medicine Hangzhou Special Service Recuperation Center of Chinese People's Liberation Army Air ForceNanjing 210000Jiangsu ProvinceChina Department of Convalescence Hangzhou Special Service Recuperation Center of Chinese People's Liberation Army Air ForceNanjing 210000Jiangsu ProvinceChina

BACKGROUND Rheumatic immune diseases are a group of chronic inflammatory diseases charac-terized by joint and systemic multi-organ involvement,including rheumatoid arthritis,systemic lupus erythematosus,and Sjogren’s syndrome,among *** pathogenesis of these diseases is related to the abnormal activation and regulatory imbalance of the immune *** prevalence and morbidity of rheumatic immune diseases are high,imposing a significant burden on patients'quality of life and socio-economic ***,the treatment of rheumatic immune diseases mainly relies on Western medicine,such as non-steroidal anti-inflammatory drugs,glucocorticoids,disease-modifying antirheumatic drugs,and ***,the therapeutic effects of Western medicine are not ideal,some patients poorly respond or are resistant to Western medicine,and long-term use often causes various adverse *** To systematically evaluate the efficacy and safety of Tripterygium wilfordii gly-cosides tablets combined with Western medicine in the treatment of patients with rheumatic immune *** This study conducted a meta-analysis to systematically evaluate the efficacy and safety of Tripterygium wilfordii glycosides tablets combined with Western medicine for patients with rheumatic immune *** and English databases were searched for randomized controlled trials(RCTs)on the treatment of rheumatic immune diseases with Tripterygium wilfordii glycosides tablets combined with Western *** quality of the included studies was assessed using the Cochrane risk of bias assessment ***-analysis was performed using RevMan 5.4 *** The meta-analysis included 11 RCTs involving 1026 patients with rheumatic immune *** combined treatment significantly reduced the risk of disease recurrence(relative risk=1.07,95%confidence interval:1.01-1.15,P<0.05)and showed no significant heterogeneity(I2=0%,P=0.53),indicating that Tripterygium wilfordii glycosides

关键词： Rheumatic immune diseases Tripterygium wilfordii polyglycosides tablets Western medicine treatment Systematic review Meta-analysis