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利用高能中微子探索宇宙线起源之谜
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作者 陈明君 黄天奇 《大学科普》 2024年第1期71-75,共5页
一、引言早在1912年,科学家就观测到了宇宙线,其主要成分是质子(约90%)和氦核(约9%)的高能微观粒子。迄今为止,观测到的宇宙射线中最高能量接近3×1020电子伏特,约等于48焦耳,相当于一颗时速150千米的网球的动能。一个直径远远小于... 一、引言早在1912年,科学家就观测到了宇宙线,其主要成分是质子(约90%)和氦核(约9%)的高能微观粒子。迄今为止,观测到的宇宙射线中最高能量接近3×1020电子伏特,约等于48焦耳,相当于一颗时速150千米的网球的动能。一个直径远远小于原子的微观粒子被加速到如此惊人的宏观能量,比地球上最大的粒子加速器LHC所能产生的最高能量大7到8个量级。这让我们很自然地产生疑问:如此高能的宇宙线来自哪里?它们是怎么被加速到这么高能量的? 展开更多
关键词 微观粒子 宇宙线 粒子加速器 宇宙射线 LHC 高能中微子 高能量
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Muon energy reconstruction in the high-energy neutrino observations
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作者 Ying Qi Jiali Liu +4 位作者 Maoyuan Liu mingjun chen Zike Wang Tianqi Huang Peiyuan Chu 《Astronomical Techniques and Instruments》 CSCD 2024年第3期197-202,共6页
The reconstruction of muon energies is crucial for the data analysis of neutrino experiments using large water Cherenkov detectors,but the resolution for muon energy reconstruction using traditional methods is poor.He... The reconstruction of muon energies is crucial for the data analysis of neutrino experiments using large water Cherenkov detectors,but the resolution for muon energy reconstruction using traditional methods is poor.Here,we propose a revised approach to remove noisy optical modules along the track produced by the propagation of muons through water.The number of photons on the optical modules is first corrected by the attenuation properties of light in water.Then the difference in time between the observed optical modules and the expected ones is determined based on the geometry of the triggered optical modules.Finally,the standard of correction is measured by the ratio of photon number before and after correction.Optical modules selection conditions were optimized according to these parameters,with most noisy optical modules successfully removed,improving the resolution of muon energy reconstruction. 展开更多
关键词 dE/dx detectors Neutrino detectors Data processing
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热气流辅助熔体微分电纺聚乳酸纤维制备 被引量:5
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作者 王晓辉 丁玉梅 +3 位作者 王军 陈明军 杨卫民 李好义 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2020年第6期79-83,90,共6页
利用自制熔体微分静电纺丝设备,以聚乳酸(PLA)为原料,探究了熔体微分静电纺丝辅助气流温度及纺丝距离对纤维直径、均匀性、孔径分布的影响。纤维直径随着气流温度的上升而变细,纤维直径均匀性也随着气流温度的上升变得更加均匀,而纤维... 利用自制熔体微分静电纺丝设备,以聚乳酸(PLA)为原料,探究了熔体微分静电纺丝辅助气流温度及纺丝距离对纤维直径、均匀性、孔径分布的影响。纤维直径随着气流温度的上升而变细,纤维直径均匀性也随着气流温度的上升变得更加均匀,而纤维直径随着纺丝距离的变化呈现波谷趋势,并且根据纤维膜孔径分布表明,纤维越细、越均匀,纤维膜孔径分布越小,并获得了最佳的气流温度及纺丝距离参数。研究表明,在纺丝温度260℃、气流流量在20 m3/h、气流温度为100℃和纺丝距离为5.5 cm时,纤维平均直径达到最小值,约为400 nm。 展开更多
关键词 热气流 聚乳酸 熔体微分 静电纺丝
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微纳米纤维空气净化滤膜的研究进展 被引量:1
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作者 李相男 李好义 +7 位作者 王悦 康宁 陈明军 陈晓青 张有忱 阎华 谭晶 杨卫民 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第5期109-114,123,共7页
微纳米纤维由于比表面积高、长径比高和孔隙率高等优点在制备空气净化滤膜方面极具应用潜力,但始终面临高的过滤效率和低过滤阻力之间的矛盾。文中首先介绍了不同材料制备的微纳米纤维膜的过滤性能,并对不同材料的特性和过滤效果进行了... 微纳米纤维由于比表面积高、长径比高和孔隙率高等优点在制备空气净化滤膜方面极具应用潜力,但始终面临高的过滤效率和低过滤阻力之间的矛盾。文中首先介绍了不同材料制备的微纳米纤维膜的过滤性能,并对不同材料的特性和过滤效果进行了分析;其次总结了典型的微纳米纤维膜结构,包括纤维形貌、纤维膜内结构和层间结构;最后对高效低阻微纳米空气滤膜今后的发展方向进行了展望。 展开更多
关键词 微纳米纤维 空气过滤 高效低阻
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Magnetorheological finishing of an irregular-shaped small-bore complex component using a small ball-end permanent-magnet polishing head 被引量:4
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作者 Henan Liu Jian cheng +1 位作者 Tingzhang Wang mingjun chen 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2019年第3期125-129,共5页
A novel magnetorheological finishing(MRF)process using a small ball-end permanent-magnet polishing head is proposed,and a four-axes linkage dedicated MRF machine tool is fabricated to achieve the nanofinishing of an i... A novel magnetorheological finishing(MRF)process using a small ball-end permanent-magnet polishing head is proposed,and a four-axes linkage dedicated MRF machine tool is fabricated to achieve the nanofinishing of an irregularψ-shaped small-bore complex component with concave surfaces of a curvature radius less than3 mm.The processing method of the complex component is introduced.Magnetostatic simulation during the entire finishing path is carried out to analyze the material removal characteristics.A typicalψ-shaped small-bore complex component is polished on the developed device,and a fine surface quality is obtained with surface roughness Raof 0.0107μm and surface accuracy of the finished spherical surfaces of 0.3320μm(PV).These findings indicate that the proposed MRF process can perform the nanofinishing of a kind of small-bore complex component with small-curvature-radius concave surfaces. 展开更多
关键词 Complex component Magnetorheological finishing Magnetostatic simulation Small curvature radius
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Formation mechanism of a smooth, defectfree surface of fused silica optics using rapid CO2 laser polishing 被引量:13
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作者 Linjie Zhao Jian cheng +5 位作者 mingjun chen Xiaodong Yuan Wei Liao Qi Liu Hao Yang Haijun Wang 《International Journal of Extreme Manufacturing》 2019年第3期85-95,共11页
Surface defects introduced by conventional mechanical processing methods can induce irreversible damage and reduce the service life of optics applied in high-power lasers.Compared to mechanical processing,laser polish... Surface defects introduced by conventional mechanical processing methods can induce irreversible damage and reduce the service life of optics applied in high-power lasers.Compared to mechanical processing,laser polishing with moving beam spot is a noncontact processing method,which is able to form a defect-free surface.This work aims to explore the mechanism of forming a smooth,defect-free fused silica surface by high-power density laser polishing with coupled multiple beams.The underlying mechanisms of laser polishing was revealed by numerical simulations and the theoretical results were verified by experiments.The simulated polishing depth and machined surface morphology were in close agreement with the experimental results.To obtain the optimized polishing quality,the effects of laser polishing parameters(e.g.overlap rate,pulse width and polishing times)on the polishing quality were experimentally investigated.It was found that the processing efficiency of fused silica materials by carbon dioxide(CO2)laser polishing could reach 8.68 mm2 s−1,and the surface roughness(Ra)was better than 25 nm.Besides,the cracks on pristine fused silica surfaces introduced by initial grinding process were completely removed by laser polishing to achieve a defect-free surface.The maximum laser polishing rate can reach 3.88μm s−1,much higher than that of the traditional mechanical polishing methods.The rapid CO2 laser polishing can effectively achieve smooth,defect-free surface,which is of great significance to improve the surface quality of fused silica optics applied in high-power laser facilities. 展开更多
关键词 laser polishing mechanical processing smooth surface defect-free surface polishing rate
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Hemispherical resonator with low subsurface damage machined by small ball-end fine diamond grinding wheel:A novel grinding technique 被引量:1
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作者 Biao QIN Henan LIU +5 位作者 Jian chenG Jinchuan TIAN Jiangang SUN Zihan ZHOU Chuanzhen MA mingjun chen 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第5期570-585,共16页
As for the ultra-precision grinding of the hemispherical fused silica resonator,due to the hard and brittle nature of fused silica,subsurface damage(SSD)is easily generated,which enormously influences the performance ... As for the ultra-precision grinding of the hemispherical fused silica resonator,due to the hard and brittle nature of fused silica,subsurface damage(SSD)is easily generated,which enormously influences the performance of such components.Hence,ultra-precision grinding experiments are carried out to investigate the surface/subsurface quality of the hemispherical resonator machined by the small ball-end fine diamond grinding wheel.The influence of grinding parameters on the surface roughness(SR)and SSD depth of fused silica samples is then analyzed.The experimental results indicate that the SR and SSD depth decreased with the increase of grinding speed and the decrease of feed rate and grinding depth.In addition,based on the material strain rate and the maximum undeformed chip thickness,the effect of grinding parameters on the subsurface damage mechanism of fused silica samples is analyzed.Furthermore,a multi-step ultra-precision grinding technique of the hemispherical resonator is proposed based on the interaction influence between grinding depth and feed rate.Finally,the hemispherical resonator is processed by the proposed grinding technique,and the SR is improved from 454.328 nm to 110.449 nm while the SSD depth is reduced by 94%from 40μm to 2.379μm.The multi-step grinding technique proposed in this paper can guide the fabrication of the hemispherical resonator. 展开更多
关键词 Fused silica Ultra-precision grinding Hemispherical resonator Subsurface damage Grinding technique
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CEPC Technical Design Report 被引量:1
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作者 Waleed Abdallah Tiago Carlos Adorno de Freitas +1111 位作者 Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin chen Danping chen Fuqing chen Fusan chen Gang chen Guoming chen Hua-Xing chen Huirun chen Jinhui chen Ji-Yuan chen Kai chen Mali chen mingjun chen Mingshui chen Ning chen Shanhong chen Shanzhen chen Shao-Long chen Shaomin chen Shiqiang chen Tianlu chen Wei chen Xiang chen Xiaoyu chen Xin chen Xun chen Xurong chen Ye chen Ying chen Yukai chen Zelin chen Zilin chen Gang chen Boping chen Chunhui chen Hok Chuen cheng Huajie cheng Shan cheng Tongguang cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen 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Lihua Huo Talab Hussain Kyuyeong Hwang Ara loannisian Munawar Iqbal Paul Jackson Shahriyar Jafarzade Haeun Jang Seoyun Jang Daheng Ji Qingping Ji Quan Ji Xiaolu Ji Jingguang Jia Jinsheng Jia Xuewei Jia Zihang Ja Cailian Jiang Han Ren Jiang Houbing Jiang Jun Jiang Xiaowei Jiang Xin Jiang Xuhui Jiang Yongcheng Jiang Zhongjian Jiang cheng Jiang Ruiqi Jiao Dapeng Jin Shan Jin Song Jin Yi Jin Junji Jis Sunghoon Jung Goran Kacarevic Eric Kajfasz Lidia Kalinovskaya Aleksei Kampf Wen Kang Xian-Wei Kang Xiaolin Kang Biswajit Karmakar Zhiyong Ke Rijeesh Keloth Alamgir Khan Hamzeh Khanpour Khanchai Khosonthongkee KhanchaiKhosonthongkee Bobae Kim Dongwoon Kim Mi Ran Kim Minsuk Kim Sungwon Kim On Kim Michael Klasen Sanghyun Ko Ivan Koop Vitaliy Kornienko Bryan Kortman Gennady Kozlov Shiqing Kuang Mukesh Kumar Chia Ming Kuo Tsz Hong Kwok Fran cois Sylvain Ren Lagarde Pei-Zhu Lai Imad Laktineh Xiaofei Lan Zuxiu Lan Lia Lavezzi Justin Lee Junghyun Lee Sehwook Lee Ge Lei Roy Lemmon longxiang Leng Sze Ching Leung Hai Tao Li Bingzhi Li Bo Li Bo Li Changhong Li Chao Li cheng Li cheng Li Chunhua Li Cui Li Dazhang Li Dikai Li Fei Li Gang Li Gang Li Gang Li Gaosong Li Haibo Li Haifeng Li Hai-Jun Li Haotian Li Hengne Li Honglei Li Huijing Li Jialin Li Jingyi Li Jinmian Li Jun Li Leyi Li Liang Li Ling Li Mei Li Meng Li Minxian Li Pei-Rong Li Qiang Li Shaopeng Li Shenghe Li Shu Li Shuo Li Teng Li Tiange Li Tong Li Weichang Li Weidong Li Wenjun Li Xiaoling Li Xiaomei Li Xiaonan Li Xiaoping Li Xiaoting Li Xin Li Xinqiang Li Xuekang Li Yang Li Yanwei Li Yiming Li Ying Li Ying-Ying Li Yonggang Li Yonglin Li Yufeng Li Yuhui Li Zhan Li Zhao Li Zhiji Li Tong Li Lingfeng Li Fei Li Jing Liang Jinhan Liang Zhijun Liang Guangrui Liao Hean Liao Jiajun Liao Libo Liao Longzhou Liao Yi Liao Yipu Liao Ayut Limphirat AyutLimphirat Tao Lin Weiping Lin Yufu Lin Yugen Lin Beijiang Liu Bo Liu Danning Liu Dong Liu Fu-Hu Liu Hongbang Liu Huangcheng Liu Hui Liu Huiling Liu Jia Liu Jia Liu Jiaming Liu Jianbei Liu 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Guofeng Qu Antonio Racioppi Michael Ramsey-Musolf Shabbar Raza Vladimir Rekovic Jing Ren Jirgen Reuter Tania Robens Giancarlo Rossi Manqi Ruan Manqi Ruan Leonid Rumyantsev Min Sang Ryu Renat Sadykov Minjing Sang Juan Jose Sanz-Cillero Miroslav Saur Nishil Savla Michael A.Schmidt Daniele Sertore Ron Settles Peng Sha Ding-Yu Shao Ligang Shao Hua-Sheng Shao Xin She Chuang Shen Hong-Fei Shen Jian-Ming Shen Peixun Shen Qiuping Shen Zhongtao Shen Shuqi Sheng Haoyu Shi Hua Shi Qi Shi Shusu Shi Xiaolei Shi Xin Shi Yukun Shi Zhan Shi Ian Shipsey Gary Shiu Chang Shu Zong-Guo Si Andrei Sidorenkov Ivan Smiljanc Aodong Song Huayang Song Jiaojiao Song Jinxing Song Siyuan Song Weimin Song Weizheng Song Zhi Song Shashwat Sourav Paolo Spruzzola Feng Su Shengsen Su Wei Su Shufang Su Yanfeng Sui Zexuan Sui Michael Sullivan Baiyang Sun Guoqiang Sun Hao Sun Hao-Kai Sun Junfeng Sun Liang Sun Mengcheng Sunl Pengfei Sun Sichun Sun Xianjing Sun Xiaohu Sun Xilei Sun Xingyang Sun Xin-Yuan Sun Yanjun Sun Yongzhao 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Xing Zhizhong Xing Da Xu Fang Xu Fanrong Xu Haisheng Xu Haocheng Xu Ji Xu Miaofu Xu Qingjin Xu Qingnian Xu Wei Xu Wei Xu Weixi Xu Xinping Xu Zhen Xu Zijun Xu Zehua Xu Yaoyuan Xu Feifei Xue Baojun Yan Bin Yan Fen Yan Fucheng Yan Jiaming Yan Liang Yan Luping Yan Qi-Shu Yan Wenbiao Yan Yupeng Yan Luping Yan Haoyue Yan Dong Yang Fengying Yang Guicheng Yang Haijun Yang Jin Min Yang Jing Yang Lan Yang Li Yang Li Lin Yang Lili Yang Litao Yang Mei Yang Qiaoli Yang Tiansen Yang Xiaochen Yang Yingjun Yang Yueling Yang Zhengyong Yang Zhenwei Yang Youhua Yang Xiancong Yang De-Liang Yao Shi Yao Lei Ye Lingxi Ye Mei Ye Rui Ye Rui Ye Yecheng Ye Vitaly Yermolchyk Kai Yi Li Yi Yang Yi Di Yin Peng-Fei Yin Shenghua Yin Ze Yin Zhongbao Yin Zhang Yinhong Hwi Dong Yoo Zhengyun You Charles Young Boxiang Yu chenghui Yu Fusheng Yu Jie-Sheng Yu Jinqing Yu Lingda Yu Zhao-Huan Yu Felix Yu Bingrong Yu Changzheng Yuan Li Yuan Xing-Bo Yuan Youjin Yuan Junhui Yue Qian Yue Baobiao Yue Un Nisa Zaib Riccardo Zanzottera Hao Zeng Ming Zeng Jian Zhai Jiyuan Zhai Xin Zhe Zhai Xi-Jie Zhan Ben-Wei Zhang Bolun Zhang Di Zhang Guangyi Zhang Hao Zhang Hong-Hao Zhang Huaqiao Zhang Hui Zhang Jialiang Zhang Jianyu Zhang Jianzhong Zhang Jiehao Zhang Jielei Zhang Jingru Zhang Jinxian Zhang Junsong Zhang Junxing Zhang Lei Zhang Lei Zhang Liang Zhang Licheng Zhang Liming Zhang Linhao Zhang Luyan Zhang Mengchao Zhang Rao Zhang Shulei Zhang Wan Zhang Wenchao Zhang Xiangzhen Zhang Xiaomei Zhang Xiaoming Zhang Xiaoxu Zhang Xiaoyu Zhang Xuantong Zhang Xueyao Zhang Yang Zhang Yang Zhang Yanxi Zhang Yao Zhang Ying Zhang Yixiang Zhang Yizhou Zhang Yongchao Zhang Yu Zhang Yuan Zhang Yujie Zhang Yulei Zhang Yumei Zhang Yunlong Zhang Zhandong Zhang Zhaoru Zhang Zhen-Hua Zhang Zhenyu Zhang Zhichao Zhang Zhi-Qing Zhang Zhuo Zhang Zhiqing Zhang Cong Zhang Tianliang Zhang Luyan Zhang Guang Zhao Hongyun Zhao Jie Zhao Jingxia Zhao Jingyi Zhao Ling Zhao Luyang Zhao Mei Zhao Minggang Zhao Mingrui Zhao Qiang Zhao Ruiguang Zhao Tongxian Zhao Yaliang Zhao Ying Zhao Yue Zhao Zhiyu Zhao Zhuo Zhao Alexey Zhemchugov Hongjuan Zheng Jinchao Zheng Liang Zheng Ran Zheng shanxi zheng Xu-Chang Zheng Wang Zhile Weicai Zhong Yi-Ming Zhong chen Zhou Daicui Zhou Jianxin Zhou Jing Zhou Jing Zhou Ning Zhou Qi-Dong Zhou Shiyu Zhou Shun Zhou Sihong Zhou Xiang Zhou Xingyu Zhou Yang Zhou Yong Zhou Yu-Feng Zhou Zusheng Zhou Demin Zhou Dechong Zhu Hongbo Zhu Huaxing Zhu Jingya Zhu Kai Zhu Pengxuan Zhu Ruilin Zhu Xianglei Zhu Yingshun Zhu Yongfeng Zhu Xiao Zhuang Xuai Zhuang Mikhail Zobov Zhanguo Zong Cong Zou Hongying Zou 《Radiation Detection Technology and Methods》 CSCD 2024年第1期I0003-I0016,1-1091,共1105页
The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 3... The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs factory.In its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs bosons.Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of magnitude.This Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering aspects.Additionally,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection procedures.Construction is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 years.The commencement of experiments and data collection could potentially be initiated in the mid-2030s. 展开更多
关键词 initiated EXCEEDING PRECISE
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Defect engineering of W^(6+)-doped NiO for high-performance black smart windows
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作者 Yingjun Xiao Xiang Zhang +6 位作者 Dukang Yan Jianbo Deng mingjun chen Hulin Zhang Wenhai Sun Jiupeng Zhao Yao Li 《Nano Research》 SCIE EI CSCD 2024年第4期3043-3052,共10页
In this report,W^(6+)doping as a defect engineering strategy has been proposed to improve the electrochromic properties of NiO film.Further research was conducted to explore the electrochromic properties and the modif... In this report,W^(6+)doping as a defect engineering strategy has been proposed to improve the electrochromic properties of NiO film.Further research was conducted to explore the electrochromic properties and the modified mechanism of W-doped NiO film.Compared to the pure NiO,W-doped NiO film exhibits improved electrochromic properties with significant optical modulation(61.56%at 550 nm),fast switching speed(4.42 s/1.40 s for coloring/bleaching),high coloration efficiency(45.41 cm^(2)·C-1)and outstanding cycling stability(no significant attenuation after 2000 cycles)in Li-based electrolytes.Density functional theory(DFT)calculations combined with the experimental results indicate that the improved electrochromic properties were due to enhanced the electronic conductivity and ion conductivity after the introduction of W^(6+).The charge capacity of W-doped NiO has also been improved,and it can function with WO_(3) to achieve a high performance black electrochromic smart window(ECSW)by balancing charge.This work could advance the fundamental understanding of defect engineering as an effective strategy to boost the electrochromic properties of NiO anodic material,manifesting a significant development as a candidate counter electrode in high-performance black smart windows. 展开更多
关键词 NIO defect engineering charge balance black electrochromic windows
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Generating Baikal-GVD high energy cascade-like neutrino events with a GEANT4-based simulation toolkit
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作者 Zike Wang A.D.Avrorin +9 位作者 Zhen Cao mingjun chen Peiyuan Chu Zh.-A.M.Dzhilkibaev Bo Gao Tianqi Huang Jiali Liu Ying Qi Xiaohao You D.N.Zaborov 《Chinese Physics C》 SCIE CAS CSCD 2024年第10期256-263,共8页
Using the GEANT4 and Cosmic Ray Monte Carlo(CRMC)software packages,we developed a new simulation toolkit for astrophysical neutrino telescopes.By configuring the Baikal-GVD detector and comparing the vertex position a... Using the GEANT4 and Cosmic Ray Monte Carlo(CRMC)software packages,we developed a new simulation toolkit for astrophysical neutrino telescopes.By configuring the Baikal-GVD detector and comparing the vertex position and direction of incident particles,as well as the channel-by-channel signals,to the events detected by Baikal-GVD,we successfully generated 13 high-energy cascade neutrino events with the toolkit.Our analysis revealed a systematic offset between the reconstructed shower position and the true interaction position,with a distance close to the scale of the shower maximum of−0.54±1.29 m.We achieved a good linear relationship between the photoelectron number of neutrino events obtained by simulation and the real data measured by Baikal-GVD.The simulation toolkit could serve as a reliable basis for studying the performance of astrophysical neutrino telescopes. 展开更多
关键词 high-energy neutrino cascade event simulation CHERENKOV
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Investigation of pore structure alteration and permeability enhancement of shale matrix by supercritical water treatment after hydraulic fracturing
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作者 Yili Kang Peisong Li +4 位作者 Wangkun Cao mingjun chen Lijun You Jiang Liu Zhehan Lai 《Petroleum》 EI CSCD 2024年第2期265-274,共10页
Shale gas reservoirs are unconventional tight gas reservoirs,in which horizontal wells and hydraulic fracturing are required to achieve commercial development.The fracture networks created by hydraulic fracturing can ... Shale gas reservoirs are unconventional tight gas reservoirs,in which horizontal wells and hydraulic fracturing are required to achieve commercial development.The fracture networks created by hydraulic fracturing can increase the drainage area extensively to enhance shale gas recovery.However,large volumes of fracturing fluid that is difficult to flow back to the surface and remained in the shale formation,will inevitably lead to damages of the shale formations and limit the effectiveness of stimulation.Supercritical water(SCW)treatment after hydraulic fracturing is a new method to enhance shale gas recovery by using appropriate heat treatment methods to the specific formation to convert the retained fracturing fluid into a supercritical state(at temperatures in excess of 373.946°C and pressures in excess of 22.064 MPa).An experiment was conducted to simulate the reaction between shale and SCW,and the capacity of SCW treatment to enhance the permeability of the shale was evaluated by measuring the response of the shale porosity and permeability on SCW treatment.The experimental results show that the shale porosity and permeability increase by 213.43%and 2198.37%,respectively.The pore structure alteration and permeability enhancement of the shale matrix were determined by analyzing the changes in pore structure and mineral composition after SCW treatment.The mechanisms that affect pore structure and mineral composition include oxidative catalysis decomposition of organic matters and reducing minerals,acid-catalyzed decomposition of carbonate minerals and feldspar minerals,hydrothermal catalysis induced fracture extension and cementation weakening induced fracture extension.SCW treatment converts harm into a benefit by reducing the intrusion of harmful substances into the shale formation,which will broaden the scope and scale of shale formation stimulation. 展开更多
关键词 Shale gas Formation damage control Formation heat treatment Supercritical water
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Experimental and modeling study of surface topography generation considering tool-workpiece vibration in high-precision turning 被引量:1
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作者 Xingying ZHOU Henan LIU +4 位作者 Tianyu YU Ruiyang GUO Guangzhou WANG Yazhou SUN mingjun chen 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第7期194-212,共19页
High-precision turning(HPT)is a main processing method for manufacturing rotary high-precision components,especially for metallic parts.However,the generated vibration between tool tip and workpiece during turning may... High-precision turning(HPT)is a main processing method for manufacturing rotary high-precision components,especially for metallic parts.However,the generated vibration between tool tip and workpiece during turning may seriously deteriorate the surface integrity.Therefore,exploring the effect of vibration on turning surface morphology and quality of copper parts using 3D surface topography regeneration model is crucial for predicting HPT performance.This developed model can update the machined surface topology in real time.In this study,the effects of tool arc radius,feed rate,radial vibration,axial vibration and tangential vibration on the surface topography and surface roughness were explored.The results show that the effect of radial vibration on surface topography is greater than that of axial vibration and tangential vibration.The radial vibration frequency is also critical.When vibration frequency changes,the surface topography profile presents three different types:the standard sinusoidal curve,the sinusoidal curve whose lowfrequency signal envelopes high-frequency signal,and the oscillation curve whose low-frequency signal superimposes high-frequency signal.In addition,HPT experiment was carried out to validate the developed model.The surface roughness obtained in the experiment was Ra=53 nm,while the roughness obtained by the simulation was Ra=46 nm,achieving a prediction accuracy of 86.7%.Received 4 September 2022;revised 3 October 2022;accepted 17 October 2022. 展开更多
关键词 High-precision turning Machining vibration Modeling Surface roughness Surface topography
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A novel method of water bath heating assisted small ball-end magnetorheological polishing for hemispherical shell resonators
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作者 Jinchuan TIAN mingjun chen +1 位作者 Jian chenG Henan LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第12期451-460,共10页
Hemispherical shell resonator(HSR)is the core component of hemispherical resonator gyro.It is aφ-shaped small-bore complex component with minimum curvature radius less than 3 mm.Thus,traditional polishing methods are... Hemispherical shell resonator(HSR)is the core component of hemispherical resonator gyro.It is aφ-shaped small-bore complex component with minimum curvature radius less than 3 mm.Thus,traditional polishing methods are difficult to polish it.Small ball-end magnetorheological polishing method can polish the small components with complicated three-dimensional surface and obtain non-destructive surface.Therefore,this method is suitable for polishing HSR.However,the material removal rate of the ordinary small ball-end magnetorheological polishing is low,leading to long polishing time and low output of HSR.To solve this problem,a water bath heating assisted small ball-end magnetorheological polishing method is proposed in this research.The influence rule of processing parameters on the material removal rate is studied experimentally.A set of optimal processing parameters is obtained to maximize the material removal rate.Compared with the ordinary method,the material removal rate of the new method can be improved by 143%.Subsequently,an HSR is polished by the new method.The results show that the polishing time can be reduced by 55%,and the polished surface roughness can reach 7.7 nm.The new method has the great potential to be used in actual production to improve the polishing efficiency of HSR. 展开更多
关键词 Hemispherical shell resonator Magnetorheological fluid temperature Material removal rate Optimization Small ball-end magnetorheological polishing
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基于硅氧体系的织物用阻燃、疏水双功能涂层
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作者 李鑫超 夏长林 +3 位作者 陈明军 汪婷 符志成 邓瑾妮 《化学进展》 SCIE CAS CSCD 北大核心 2023年第12期1783-1792,共10页
织物的阻燃涂层在日常使用和清洁维护中,由于亲水性太强易导致阻燃性能急剧下降,因此阻燃、疏水双功能涂层现已成为织物功能涂层的研究热点。其中硅氧体系化合物由于同时具有高耐热性和低表面能,因而在阻燃和疏水涂层体系中表现优异。... 织物的阻燃涂层在日常使用和清洁维护中,由于亲水性太强易导致阻燃性能急剧下降,因此阻燃、疏水双功能涂层现已成为织物功能涂层的研究热点。其中硅氧体系化合物由于同时具有高耐热性和低表面能,因而在阻燃和疏水涂层体系中表现优异。本文通过有机硅体系、有机硅/纳米二氧化硅杂化体系以及笼型聚倍半硅氧烷(POSS)体系在高温成炭性、低表面能、表面微纳结构以及可控多功能化等方面的优异展现,层层递进地描述了兼具优异阻燃和疏水性能的织物用涂层的最新研究进展,并探究了其阻燃和疏水性能与硅氧系化合物结构之间的构效关系。最后提出阻燃和疏水性能间的协同机理、高效性的提升以及复杂环境下涂层性能的服役稳定性等,是织物用阻燃、疏水双功能涂层的未来发展方向;并针对功能化织物材料的部分应用场景需求,提出了热点分析与展望。 展开更多
关键词 硅氧体系 阻燃和疏水 微纳结构 可控多功能化
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Measurement of water quality in LHAASO-WCDA
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作者 Huicai Li mingjun chen +6 位作者 Bo Gao Huihai He cheng Liu Kai Li Bodong Wang Xiaohao You Yuelei Zhang 《Radiation Detection Technology and Methods》 CSCD 2023年第2期192-199,共8页
Introduction The water Cherenkov detector array(WCDA)is an important detector in the Large High Altitude Air Shower Observatory(LHAASO),which is tasked with continuously surveying VHE gamma-rays sky.The WCDA covers an... Introduction The water Cherenkov detector array(WCDA)is an important detector in the Large High Altitude Air Shower Observatory(LHAASO),which is tasked with continuously surveying VHE gamma-rays sky.The WCDA covers an area of 78,000 m2 and contains 350,000 tons of purified water.The water quality and its stability are critical for its performance and long-term operation.Method Light is exponentially attenuated when propagating in water.Water attenuation length can be obtained by comparing light intensities at different optical path lengths,which is the basic principle of direct measurements.Here,a cylindrical device was designed to continuously monitor and measure water quality in the LHAASO-WCDA.Conclusion The systematic error of the cylindrical device was about 4.1%,indicating it is capable of measuring the water attenuation length in WCDA.Furthermore,suspended particle number and turbidity were confirmed as significantly related to the measured attenuation length. 展开更多
关键词 Water Cherenkov LHAASO-WCDA Water quality
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Potential damage threats to downstream optics caused by Gaussian mitigation pits on rear KDP surface 被引量:3
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作者 Hao Yang Jian cheng +5 位作者 Zhichao Liu Qi Liu Linjie Zhao Chao Tan Jian Wang mingjun chen 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2020年第4期59-67,共9页
To determine whether a potassium dihydrogen phosphate(KDP)surface mitigated by micro-milling would potentially threaten downstream optics,we calculated the light-field modulation based on angular spectrum diffraction ... To determine whether a potassium dihydrogen phosphate(KDP)surface mitigated by micro-milling would potentially threaten downstream optics,we calculated the light-field modulation based on angular spectrum diffraction theory,and performed a laser damage test on downstream fused silica.The results showed that the downstream light intensification caused by a Gaussian mitigation pit of 800μm width and 10μm depth reached a peak value near the KDP rear surface,decreased sharply afterward,and eventually kept stable with the increase in downstream distance.The solved peak value of light intensification exceeded 6 in a range 8–19 mm downstream from the KDP rear surface,which is the most dangerous for downstream optics.Laser damage sites were then induced on the fused silica surface in subsequent laser damage tests.When the distance downstream was greater than 44 mm with a downstream light intensification of less than 3,there were no potential damage threats to downstream optics.The study proves that a mitigated KDP surface can cause laser damage to downstream optical components,to which attention should be paid in an actual application.Through this work,we find that the current manufacturing process and the mitigation index still need to be improved.The research methods and calculation models are also of great reference significance for related studies like optics mitigation and laser damage. 展开更多
关键词 downstream threats KDP laser damage MICRO-MILLING MITIGATION
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Interference and grinding characteristics in ultra-precision grinding of thin-walled complex structural component using a ball-end grinding wheel 被引量:2
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作者 Tingzhang WANG Henan LIU +2 位作者 Chunya WU Jian chen mingjun chen 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第4期192-207,共16页
As for ultra-precision grinding of difficult-to-process thin-walled complex components with ball-end grinding wheels,interference is easy to occur.According to screw theory and grinding kinematics,a mathematical model... As for ultra-precision grinding of difficult-to-process thin-walled complex components with ball-end grinding wheels,interference is easy to occur.According to screw theory and grinding kinematics,a mathematical model is established to investigate the interference and grinding characteristics of the ball-end wheel.The relationship between grinding wheel inclination angle,C axis rotation angle,grinding position angle and grinding wheel wear are analyzed.As the grinding wheel inclination angle increases,the C axis rotatable range decreases and the grinding position angle increases.The grinding position angle and wheel radius wear show a negative correlation with the C axis rotation angle.Therefore,a trajectory planning criteria for increasing grinding speed as much as possible under the premise of avoiding interference is proposed to design the grinding trajectory.Then grinding point distribution on the ball-end wheel is calculated,and the grinding characteristics,grinding speed and maximum undeformed chip thickness,are investigated.Finally,a complex structural component can be ground without interference,and surface roughness and profile accuracy are improved to 40.2 nm and 0.399 lm,compared with 556 nm and 3.427 lm before ultra-precision grinding.The mathematical model can provide theoretical guidance for the analysis of interference and grinding characteristics in complex components grinding to improve its grinding quality. 展开更多
关键词 Ultra-precision grinding Complex component Ball-end grinding wheel INTERFERENCE Grinding characteristics
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Experimental and numerical study of deposition mechanisms for cold spray additive manufacturing process 被引量:2
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作者 Tianyu YU mingjun chen Zhuoru WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第2期276-290,共15页
Cold spray is an attractive and rapidly developing process for additive manufacturing with high efficiency and precision,repairing and coating,especially in aircraft and aerospace applications.Cold spray additive manu... Cold spray is an attractive and rapidly developing process for additive manufacturing with high efficiency and precision,repairing and coating,especially in aircraft and aerospace applications.Cold spray additive manufacturing deposits micro-particles with large plastic deformation below their melting point,eliminating heat effect zone which could deteriorate the quality of repairing zone.The particle deposition in cold spray is a complex process which involves high strain rate,high contact pressure and high temperature.Here we develop,utilize and validate a thermomechanical model to provide a definitive way to predict deposition mechanics and surface deformation evolution for particle deposition process in cold spray additive manufacturing.Both a single particle and dual particles models were developed to investigate the contact interaction between particle/substrate and particle/particle.Different combinations of particle/substrate materials(Cu/Cu,Al/Al,steel/steel,and nickel/nickel)and process parameters were considered in this study.The experimental study was conducted to validate simulation results,providing useful information for understanding the limitations and challenges associated with cold spray additive manufacturing.The framework provides insights into improving the quality and precision of stress/strain formation,particle interactions and particle deposition in cold spray additive manufacturing process. 展开更多
关键词 Additive manufacturing Cold spray Finite element analysis Residual stresses Surface morphology
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Combined studies of surface evolution and crack healing for the suppression of negative factors during CO_(2) laser repairing of fused silica 被引量:1
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作者 Chao Tan Linjie Zhao +5 位作者 mingjun chen Jian cheng Zhaoyang Yin Qi Liu Hao Yang Wei Liao 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第4期44-49,共6页
In order to reveal the evolution mechanism of repaired morphology and the material's migration mechanism on the crack surface in the process of CO_(2) laser repairing surface damage of fused silica optics, two mul... In order to reveal the evolution mechanism of repaired morphology and the material's migration mechanism on the crack surface in the process of CO_(2) laser repairing surface damage of fused silica optics, two multi-physics coupling mathematical models with different scales are developed, respectively. The physical problems, such as heat and mass transfer,material phase transition, melt flow, evaporation removal, and crack healing, are analyzed. Studies show that material ablation and the gasification recoil pressure accompanying the material splash are the leading factors in forming the Gaussian crater with a raised rim feature. The use of low-power lasers for a long time can fully melt the material around the crack before healing, which can greatly reduce the size of the residual air layer. Combined with the experimental research, the methods to suppress the negative factors(e.g., raised rim, deposited debris, air bubbles) in the CO_(2) laser repairing process are proposed. 展开更多
关键词 CO_(2)laser repairing fused silica crack healing surface evolution
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The Critical Roles of the Gas Flow in Fabricating Polymer Nanofbers:A Mini‑review 被引量:1
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作者 Chao Zhang mingjun chen +2 位作者 Haoyi Li Weimin Yang Jing Tan 《Advanced Fiber Materials》 SCIE CAS 2022年第2期162-170,共9页
Polymer nanofbers attract more and more attention from academia and industry continuously due to their desirable properties,including high specifc surface area,high porosity,and numerous chemically-active surface grou... Polymer nanofbers attract more and more attention from academia and industry continuously due to their desirable properties,including high specifc surface area,high porosity,and numerous chemically-active surface groups on the fber surface.Gas fow was widely adopted to fabricate nanofbers such as solution blown,melt blown,gas fow-assisted melt electrospinning,and bubble electrospinning.However,a comprehensive review covered the roles that gas fow played in fabricating nanofbers,and their mechanism has not been analysed yet.This review classifes the roles of gas fow into jet initialization,jet stretching,increasing production,surface modifcation,and inhibition of thermal degradation,to deepen the understanding of gas fow during nanofber preparation.The mechanism of gas fows in the above felds is reviewed in detail. 展开更多
关键词 Gas fow Nanofber ELECTROSPINNING
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