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Three-dimensional parametric contact analysis of planetary roller screw mechanism and its application in grouping for selective assembly

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Frontiers of Mechanical Engineering 2024年第1期19卷 53-72页

作者： huilin he Peitang WEI Huaiju LIU Xuesong DU Rui HU Genshen LIU Yajun WU State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing UniversityChongqing 400044China Taiyuan heavy Machinery Group Co. Ltd.Taiyuan 030024China

The planetary roller screw mechanism(PRSM)is a novel precision transmission mechanism that realizes the conversion between linear and rotary *** contact characteristics of helical surfaces directly determine PRSM’s performance in load-carrying capacity and transmission ***,studying the contact characteristics of PRSM forms the fundamental basis for enhancing its transmission *** this study,a three-dimensional parametric analysis method of contact characteristics is proposed based on the PRSM meshing principle and PyVista(a high-level API to the Visualization Toolkit).The proposed method considers the influence of machining errors among various thread *** effects of key machining errors on contact positions and axial clearance,as well as their sensitivities,are *** excellent solution accuracy,this method exhibits higher calculation efficiency and stronger robustness than the analytical and numerical meshing *** influence of nominal diameter and pitch errors of the screw,roller,and nut on the axial clearance follows a linear relationship,whereas flank angle errors have negligible effects on the axial *** corresponding influence coefficients for these three machining errors on the axial clearance are 0.623,0.341,and *** variations in contact positions caused by individual errors are *** angle errors and roller diameter errors result in linear displacements of the contact points,whereas pitch errors cause the contact points to move along the arc of the roller *** on the proposed threedimensional parametric contact characteristics analysis method,the Fuzzy C-Means clustering algorithm considering error sensitivity is utilized to establish a component grouping technique in the selective assembly of critical PRSM components,ensuring the rational and consistent clearances based on the given component’s machining *** study provides effective guidance for analyzing conta

关键词： planetary roller screw mechanism(PRSM) contact position axial clearance machining error grouping for selective assembly

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Study on direct point spread function measurement of capillary plate collimators with divergent X-ray beams

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Radiation Detection Technology and Methods 2023年第3期7卷 321-336页

作者： Tianming Li Tao Luo Yupeng Xu huilin he Liming Song Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China

Purpose The Filed of View(FOV)of eXTP/LAD is limited by lead-glass capillary plate collimators placed in front of the Silicon Drift Detectors(SDDs)for reducing the background contamination caused by the photons of Cosmic X-ray Background(CXB)leaking from outside the *** core quality parameters of lead-glass capillary plate collimators are Open Area Ratio(OAR)and *** performance of lead-glass capillary plate collimators is determined by its design specification such as pore-to-pore misalignment,pore perpendicularity with collimator surface and pore *** the design specification is the result of a large number of micropores,we use the full width at half maximum(FWHM)and peak value of point spread function(PSF)to characterize the capillary plate collimator *** order to quickly evaluate the performances of collimators,we developed a direct PSF measurement method using divergent *** In this paper,the simulation package of the divergent beamsmeasurement setup is developed based on *** simulation parameters of scintillator absorption length are corrected by experimental *** simulate the PSF of collimators with different distribution of pore diameter and misalignment by parallel beams and divergent *** comparing the peak value and FWHM of collimators PSF,the feasibility in replacing parallel beams measurement with divergent beams measurement is *** It is verified that the influence of the geometric size of 33μm radius of the micro-focus of X-ray tube can be *** results show that the FWHM of collimators is increased with error root mean square error(RMS)of the distribution of collimators pore diameter and pore inclination *** peak value of PSF is mainly influenced by pore non-parallelism of the pores,and it decreases with an increase in pore inclination *** of parallel beams PSF and divergent beams PSF shows well consistency of peak value and FWHM of ***,the peak value of

关键词： Geant4 EXTP/LAD Capillary plate collimators Divergent X-ray beams measurment

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A Comparative Study of Sexism in the Chinese and American English Languages and Cultures

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Sino-US English Teaching 2006年第2期3卷 58-62,66页

作者： huilin Li Yi he Yunbo Sun Kunming University of Science and Technology

Both China and Britain have gone through a long history of feudal society, in which women did not enjoy any kind Of social status. They were deprived of social, political, economic and cultural rights and discriminated against by a male-dominant society. The discrimination against women has left its traces in both Chinese and English languages and cultures, even when the language and culture have changed significantly in the migration to another continent （as in the ease of American English）. This paper discusses sexism in the two languages and cultures from a comparative perspective.

关键词： sexism Chinese English Culture

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The Sinian——Cambrian Boundary of China (Summarized in English)

中国地质科学院地质研究所文集

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中国地质科学院地质研究所文集 1984年 190-205页

作者： Xing Yusheng Ding Qixiu Luo huilin he Tinggui and Wang Yangeng

The Sinian and Cambrian systems within the Yangtze stratigraphic pro- vince represent continuous deposits,and the strata above and below the bo- undary between them are rich in *** all the relevant boundary sections,the Meishucun section in Jinning County,Yunnan Province serves as the stratotype section for the Sinian-Cambrian boundary and also the Chinese Candidate for global stratotype section and point for Precambrian- Cambrian *** present paper,with the various charts and tables, elaborates on several typical Sinian-Cambrian boundary sections and the dis- tribution of fossils in them.

关键词： Cambrian The Sinian sections stratigraphic fossil strata charts assemblage Yangtze 地质研究所

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Studies of the linearity of the readout module assembling using the eXTP-GPD chips

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Radiation Detection Technology and Methods 2023年第2期7卷 255-262页

作者： Jiechen Jiang Liang Sun Yang Jiao Weichun Jiang Yupeng Xu huilin he Xiaohua Liu Yuanyuan Du Sheng Yang Zefang Dong Xiaojing Liu Boyu Dai Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Key Laboratory of Particle Astrophysics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China

Background The Gas Pixel Detector(GPD)is a key part of the Polarimetry Focusing Array(PFA)sub-system onboard the enhance X-ray Timing and Polarimetry mission(eXTP).The GPD can accurately provide the polarized angle and degree for incoming soft X-rays(requirements of minimum detectable polarizationhe GPD chips on a matched ceramic package is one of the most important procedures for the GPD assembly,and the parallelism between the top surface of an ASIC chip and the bottom surface of a Gas Electron Multiplier(GEM)foil can have impact on the distribution of electric field within transfer region and reconstruction of photoelectric trajectories,resulting in deterioration of the GPD *** study quantifies the influence and gives a reasonable expectation of the *** A simulation framework of the GPD is constructed to quantify the influence on the GPD performance and values of the parallelism are measured by a gauge with a position resolution of o.1μ***:The difference of degree of modulation is less than 1% comparing the parallelism with a value of 20μm to a value of 0μm in response to both polarized and unpolarized ***,the value of parallelism can reach 6.9±3.4μm(0.0176°±0.0087°)by testing and *** The impact on the GPD performance can be less than 1%as the parallelism with an order of 20μm,and we also give a reasonable measuring method and verify the controllability and feasibility of the parallelism with an order of 20μm for pasting the ASIC chip on the surface of a ceramic package.

关键词： Parallelism Gas pixel detectors Gaseous detector simulation Measurements

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The Sinian——Cambrian Boundary of China （Summarized in English）

The Sinian——Cambrian Boundary of China （Summarized in Eng...

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作者： Xing Yusheng Ding Qixiu Luo huilin he Tinggui and Wang Yangeng

＜正＞The Sinian and Cambrian systems within the Yangtze stratigraphic pro- vince represent continuous deposits,and the strata above and below the bo- undary between them are rich in *** all the relevant boundary sections,the Meishucun section in Jinning County,Yunnan Province serves as the stratotype section for the Sinian-Cambrian boundary and also the Chinese Candidate for global stratotype section and point for Precambrian- Cambrian *** present paper,with the various charts and tables, elaborates on several typical Sinian-Cambrian boundary sections and the dis- tribution of fossils in them.

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纸张的电子束辐照效应研究

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核技术 2006年第2期29卷 145-148页

作者：刘志弢张化一何会林孙志超清华大学工程物理系北京100084 清华同方威视技术股份有限公司北京100084

为确证电子束辐照邮件的可行性,寻找辐照纸张时可保证品种等级的剂量范围,用不同剂量电子束照射新闻纸、复印纸、牛皮纸、书写纸、照片等几种常用的纸张,测定了纸张的定量、白度、撕裂度、抗张强度、耐折度、色差等物理性能发生的变化,... 详细信息

为确证电子束辐照邮件的可行性,寻找辐照纸张时可保证品种等级的剂量范围,用不同剂量电子束照射新闻纸、复印纸、牛皮纸、书写纸、照片等几种常用的纸张,测定了纸张的定量、白度、撕裂度、抗张强度、耐折度、色差等物理性能发生的变化,并对辐照效应的机理进行了研究。结果分析表明,20-30 kGy的邮件辐照灭菌剂量对上述性能影响小于25％。

关键词：纸张辐照效应撕裂度抗张强度耐折度色差

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高校治理现代化的基石:基于地方高校大学章程实践的探索与思考

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江西科技师范大学学报 2020年第5期15卷 87-92,98页

作者：闵学良何会林江西科技师范大学江西南昌330038

大学章程在中国特色现代大学制度体系中处于龙头地位,是高校治理体系和治理能力现代化的基石。从历史溯源维度看,大学章程伴随现代大学的建立而出现、伴随西学东渐的步伐而引入、伴随改革开放的深入而规范。从现实观照维度看,大学章程... 详细信息

大学章程在中国特色现代大学制度体系中处于龙头地位,是高校治理体系和治理能力现代化的基石。从历史溯源维度看,大学章程伴随现代大学的建立而出现、伴随西学东渐的步伐而引入、伴随改革开放的深入而规范。从现实观照维度看,大学章程制定原则体现于法有据的理念、制定过程遵从程序依规的要求、章程内容奠定依法治校的架构。从对策反思维度看,在国家层面要构建维护章程权威的法治环境、在学校层面要建立遵照章程办学的联动机制、在师生层面要形成依据章程办事的共同意识。

关键词：大学章程治理现代化历史溯源现实观照对策反思

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负压伤口疗法在肥胖产妇中应用效果的meta分析

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中国医药导报 2021年第36期18卷 85-90页

作者：何慧琳何芳黄华平电子科技大学医学院附属绵阳医院绵阳市中心医院伤口治疗中心四川绵阳621000 电子科技大学医学院附属绵阳医院绵阳市中心医院手术室四川绵阳621000

目的探讨负压伤口疗法(NPWT)在肥胖产妇中的应用效果,为临床实践提供可靠证据。方法系统检索PubMed、EMBase、the Cochrane Central Register of Controlled Trials、***及中国知网、万方数据库从建库至2020年12月发表的所有符合标准的... 详细信息

目的探讨负压伤口疗法(NPWT)在肥胖产妇中的应用效果,为临床实践提供可靠证据。方法系统检索PubMed、EMBase、the Cochrane Central Register of Controlled Trials、***及中国知网、万方数据库从建库至2020年12月发表的所有符合标准的临床随机对照研究。由两名研究人员独立阅读、提取入选研究中的数据。运用Review Manager 5.3对收集的数据进行分析,TSA 0.9对研究结果的可靠性进行评估。结果共纳入9篇文献。meta分析结果显示,两组手术切口感染率比较,差异无统计学意义(RR=0.85,95%CI:0.66~1.08,P=0.18);NPWT组切口感染在内的切口并发症发生率低于常规敷料组(RR=0.81,95%CI:0.68~0.97,P=0.02);NPWT组除切口感染外的切口并发症发生率低于常规敷料组(RR=0.75,95%CI:0.66~0.86,P<0.0001);两组再入院率比较,差异无统计学意义(RR=1.19,95%CI:0.62~2.27,P=0.60)。结论NPWT能够有效降低肥胖产妇术后切口的并发症发生率,但并不能降低该类患者的切口感染率和再入院率。

关键词：剖宫产超重负压伤口疗法 meta分析

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成人ICU压力性损伤风险评估量表的研究进展

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全科护理 2023年第22期21卷 3076-3079页

作者：蒋庆丽何梅何芳何慧琳绵阳市中心医院 621000

对成年重症监护室(ICU)病人进行精准压力性损伤风险评估是实施早期个体化护理的关键,然而在国内还没有一个公认的适用于成人的ICU压力性损伤风险评估量表。该文对国内外常用的ICU压力性损伤评估量表的内容、评估效果、优缺点进行了总结... 详细信息

对成年重症监护室(ICU)病人进行精准压力性损伤风险评估是实施早期个体化护理的关键,然而在国内还没有一个公认的适用于成人的ICU压力性损伤风险评估量表。该文对国内外常用的ICU压力性损伤评估量表的内容、评估效果、优缺点进行了总结和概括,旨在为ICU护理人员选择合适的压力性损伤风险评估工具和研究成人ICU压力损伤风险评估量表提供参考。

关键词：压力性损伤压力性损伤风险评估量表重症监护室综述

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