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Ultra-high quality factor and ultra-high accelerating gradient achievements in a 1.3 GHz continuous wave cryomodule

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Nuclear Science and Techniques 2025年第2期36卷 18-26页

作者： Jin-Fang Chen yue Zong Xiao-yun Pu Sheng-Wang Xiang Shuai Xing Zheng Li Xu-Ming Liu Yan-Fei Zhai Xiao-Wei Wu yong-Zhou He Ling-Ling Gong Ji-Dong Zhang Shan-Shan Cao Wen-Ding Fang Bin-Tuan Zhang Kai Xu Yi-Bo yu Guang-Hua Chen Li-Jun Lu Ya-Wei Huang Shen-Jie Zhao Hong-Tao Hou Zhen-yu ma Ye-Liang Zhao Xiang Zheng Jiu-Ce sun Sen sun Zhi-qiang Jiang yu-Bin Zhao Meng Zhang Ying-Bing Yan Yi-yong Liu qiang Gu Bo Liu Li-Xin Yin Dong Wang Hai-Xiao Deng Zhen-Tang Zhao Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Zhangjiang Laboratory 201210 ShanghaiChina ShanghaiTech University Shanghai 201210China

We report the world-leading performance of a 1.3 GHz cryomodule equipped with eight 9-cell superconducting radio-frequency cavities that underwent a medium-temperature furnace baking *** continuous wave horizontal testing,these cavities achieved unprecedented average intrinsic quality factors of 4.0×10^(10)at 20 MV/m and 3.2×10^(10)at 29 MV/m,with no instances of field *** cryomodule demonstrates near-complete preservation of ultra-high quality factors and ultra-high accelerating gradients from vertical to horizontal testing,marking a significant milestone in continuous-wave superconducting radio-frequency accelerator *** letter presents the cryomodule development experience,includ-ing cavity preparation,cryomodule assembly,degaussing,fast cooldown,and performance testing.

关键词： SRF cryomodule Mid-T baking High quality factor High accelerating gradient

Synthesis of Al_2O_3-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories

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Journal of materials Science & Technology 2010年第8期26卷 715-720页

作者： beiyue ma qiang zhu yong sun jingkun yu Ying Li School of materials and Metallurgy Northeastern University Shenyang 110004 China Faculty of Engineering University of Wollongong Wollongong NSW 2522 Australia

Al2O3-SiC composite was synthesized with pyrophyllite and natural graphite as raw materials by carbothermal reduction reaction under argon atmosphere. The effect of synthesis temperature on phase composition and microstructure was investigated. Low-carbon MgO-C refractories were prepared by using the synthesized Al2O3-SiC composite as additive. The effect of its addition on the slag penetration and corrosion resistance as well as oxidation resistance of the refractories was investigated, and the slag resistance and oxidation resistance mechanisms of the Al2O3-SiC composite were also discussed. The results show that the synthesis temperature has a great influence on preparation of Al2O3-SiC composite. The Al2O3-SiC composite can be synthesized at 1873-1973 K under argon atmosphere, with pyrophyllite and natural graphite as raw materials, and particle sizes of the composite synthesized at 1973 K are mainly distributed as 1-2 μm. The slag penetration and corrosion resistance of low-carbon M80-C refractories can be remarkably improved by adding the synthesized Al2O3-SiC composite, and the oxidation resistance has an improvement to some extent. The increase of slag viscosity and the formation of MgAl2O4 can effectively inhibit the slag penetration and corrosion for the refractories.

关键词： Oxide-nonoxide composite Carbothermal reduction Penetration Corrosion Oxidation resistance Refractories

Recent progress on surface chemistryⅡ:Property and characterization

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Chinese Chemical Letters 2025年第1期36卷 8-57页

作者： Xin Li Zhen Xu Donglei Bu Jinming Cai Huamei Chen Qi Chen Ting Chen Fang Cheng Lifeng Chi Wenjie Dong Zhenchao Dong Shixuan Du Qitang Fan Xing Fan qiang Fu Song Gao jing Guo Weijun Guo Yang He Shimin Hou Ying Jiang Huihui Kong Baojun Li Dengyuan Li Jie Li Qing Li Ruoning Li Shuying Li yuxuan Lin Mengxi Liu Peinian Liu Yanyan Liu jingtao Lü Chuanxu ma Haoyang Pan JinLiang Pan Minghu Pan Xiaohui Qiu Ziyong Shen qiang sun Shijing Tan Bing Wang Dong Wang Li Wang Lili Wang Tao Wang Xiang Wang Xingyue Wang Xueyan Wang Yansong Wang yu Wang Kai Wu Wei Xu Na Xue Linghao Yan Fan Yang Zhiyong Yang Chi Zhang Xue Zhang Yang Zhang Yao Zhang Xiong Zhou Junfa zhu Yajie Zhang Feixue Gao yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China Spin-X Institute School of MicroelectronicsSouth China University of TechnologyGuangzhou 511442China School of materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006China Faculty of materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Functional Nano and Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Physics&University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry Beijing Normal UniversityBeijing 100875China beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School

Surface with well-defined components and structures possesses unique electronic,magnetic,optical and chemical *** a result,surface chemistry research plays a crucial role in various fields such as catalysis,energy,materials,quantum,and *** science mainly investigates the correspondence between surface property and *** probe microscopy(SPM)techniques are important tools to characterize surface properties because of the capability of atomic-scale imaging,spectroscopy and manipulation at the single-atom *** this review,we summarize recent advances in surface electronic,magnetic and optical properties characterized mainly by SPM-based *** focus on elucidating theπ-magnetism in graphene-based nanostructures,construction of spin qubits on surfaces,topology properties of surface organic structures,STM-based light emission,tip-enhanced Raman spectroscopy and integration of machine learning in SPM studies.

关键词： Surface chemistry Scanning probe microscopy π-magnetism Spin qubits Tip-enhanced Raman spectroscopy

Novel Method for Selective Debenzylation Under maintenance of Fluoro Atom Substituted on β-Amino Acids

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Chemical Research in Chinese Universities 2011年第2期27卷 224-227页

作者： ZHENG Yi WU Gang zhu Xin-rong LI yue-jie ma yu-heng ZHAO Xin LU Tao zhu yong-qiang School of Basic Sciences China Pharmaceutical University Nanjing 210009 P R. China Jiangsu Key Laboratory of Molecular Targeted Antitumor Drug Research Jiangsu Simcere Pharmaceutical Research Institute Nanjing 210042 P R. China

tert-Butyl （R）-3-amino-3-（3-fluorophenyl）propanoate（5） was prepared with conventional debenzylation method. However, the tert-butyl （R）-3-[（S）-1-phenylethyl-amino]-3-（3-fluorophenyl） propanoate（6） and tert-butyl （R）-3-amino-3-phenylpropanoate（7） were generated as the byproducts under the general catalytic hydrogenation Pd（OH）2/C-H2 conditions. So a series of experiments was performed to optimize the reaction conditions so that product 5 could be obtained with high purity and yield. Finally an effective catalytic system, Pd/C-HCOOH-CH3OH, was discovered.

关键词： β-Amino acid Debenzylation Defluorination Catalytic hydrogenation

Zircon U-Pb geochronologic,geochemical and Sr-Nd-Pb isotope characteristics of the beidaban granites in the North Qilian Orogenic Belt:Petrogenesis and tectonic implications

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Acta Geochimica 2024年第6期43卷 1087-1104页

作者： Tao Yang Zhi-yuan sun Ming-liang Wang Xiao-qiang zhu jing-yu Zhao The First Institute of Geology and Mineral Exploration Gansu Provincial Bureau of Geology and Mineral ExplorationTianshui 741020China School of Resources and Civil Engineering Suzhou UniversitySuzhou 234000China School of Geography and Tourism Anhui Normal UniversityWuhu 241000China

The tectonic evolution and crustal accretion process of the North Qilian Orogenic Belt(NQOB)are still under debate because of a lack of integrated constraints,especially the identifi cation of the tectonic transition from arc to initial *** we present results from zircon U-Pb geochronology,whole-rock geochemistry,and Sr-Nd-Pb isotope geochemistry of the beidaban granites to provide crucial information for geodynamic evolution of *** U-Pb dating yields an age of 468±10 ma for the beidaban granites and most of the beidaban samples contain amphibole,are potassium-rich,and have A/CNK values ranging from 0.7 to 0.9,illustrating that the Middle Ordovician beidaban granites are K-rich,metaluminous,calc-alkaline *** geochemical characteristics indicate that the beidaban granites are transitional I/S-type granitoids that formed in an arc *** isotopic compositions of initial(87 Sr/86 Sr)i values ranging from 0.70545 to 0.71082(0.70842 on average)andεNd(t)values ranging from−10.9 to−6.7(−8.8 on average)with two-stage Nd model ages(T DM2)of 1.74-2.08 Ga suggest that the beidaban granites originated from Paleoproterozoic crustal *** addition,the initial Pb isotopic compositions(^(206)Pb/^(204)Pb=19.14-20.26;^(207)Pb/^(204)Pb=15.71-15.77;^(208)Pb/^(204)Pb=37.70-38.26)and geochemical features,such as high Th/Ta(17.43-30.12)and Rb/Nb(6.01-15.49)values,suggest that the beidaban granite magma source involved recycled crustal components with igneous *** on these results in combination with previously published geochronological and geochemical data from other early Paleozoic igneous rocks,we suggest that the timing of the tectonic transition from arc to the initial collision to the fi nal closure of the North Qilian Ocean can be constrained to the Middle-Late Ordovician(ca.468–450 ma).

关键词： Granitoids Zircon U-Pb dating Sr-Nd-Pb-isotopes Petrogenesis North Qilian Orogenic Belt

A method for aligning the plastic scintillator detector on DAMPE

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Research in Astronomy and Astrophysics 2019年第6期19卷 63-70页

作者： Peng-Xiong ma yong-Jie Zhang Ya-Peng Zhang Yao Li jing-jing Zang Xiang Li Tie-Kuang Dong Yi-Zhong Fan Shi-Jun Lei Jian Wu yu-Hong yu qiang yuan Chuan yue Zhi-yu sun Key Laboratory of Dark matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China School of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

The Plastic Scintillator Detector(PSD) onboard the DArk matter Particle Explorer(DAMPE)is designed to measure cosmic ray charge(Z) and to act as a veto detector for gamma ray *** fully exploit the charge identification potential of PSD and to enhance its capability to identify gamma ray events, we develop an alignment method for the PSD. The path length of a given track in the volume of a PSD bar is derived taking into account the shift and rotation alignment corrections. By examining energy spectra of corner-passing events and fully contained events, position shifts and rotations of all PSD bars are obtained, and are found to be on average about 1 mm and 0.0015 radian respectively. To validate the alignment method, we introduce artificial shifts and rotations of PSD bars into the detector *** shift and rotation parameters can be recovered successfully by the alignment procedure. As a result of the PSD alignment procedure, the charge resolution of the PSD is improved from 4% to 8%, depending on the nuclei.

关键词： instrumentation detectors-methods data analysis

Science objectives of the Einstein Probe mission

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Science China(Physics,Mechanics & Astronomy) 2025年第3期Mechanics & Astronomy) .卷 5-64页

作者： Weimin yuan Lixin Dai Hua Feng Chichuan Jin Peter Jonker Erik Kuulkers yuan Liu Kirpal Nandra Paul O’Brien Luigi Piro Arne Rau Nanda Rea Jeremy Sanders Lian Tao Junfeng Wang Xuefeng Wu Bing Zhang Shuangnan Zhang Shunke Ai Johannes Buchner Esra Bulbul Hechao Chen Minghua Chen yong Chen yu-Peng Chen Alexis Coleiro Francesco Coti Zelati Zigao Dai Xilong Fan Zhou Fan Susanne Friedrich He Gao Chong Ge Mingyu Ge Jinjun Geng Giancarlo Ghirlanda Giulia Gianfagna Lijun Gou Sébastien Guillot Xian Hou jingwei Hu yongfeng Huang Long Ji Shumei Jia S. Komossa Albert K.H.Kong Lin Lan An Li Ang Li Chengkui Li Dongyue Li Jian Li Zhaosheng Li Zhixing Ling Ang Liu Jinzhong Liu Liangduan Liu zhu Liu Jiawei Luo Ruican ma Pierre maggi Chandreyee maitra Alessio marino Stephen Chi-yung Ng Haiwu Pan Surangkhana Rukdee Roberto Soria Hui sun Pak-Hin Thomas Tam Aishwarya Linesh Thakur Hui Tian Eleonora Troja Wei Wang Xiangyu Wang Yanan Wang Junjie Wei Sixiang Wen Jianfeng Wu Ting Wu Di Xiao Dong Xu Renxin Xu Yanjun Xu yu Xu Haonan Yang bei You Heng yu yunwei yu Binbin Zhang Chen Zhang Guobao Zhang Liang Zhang Wenda Zhang yu Zhang Ping Zhou Zecheng Zou National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Sciences University of Chinese Academy of Sciences Department of Physics University of Hong Kong Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Department of Astrophysics/ImaPP Radboud University SRON Netherlands Institute for Space Research ESA/ESTEC max Planck Institute for Extraterrestrial Physics School of Physics and Astronomy University of Leicester INAF-Istituto di Astrofisica e Planetologia Spaziali Institute of Space Sciences (ICE) CSIC Campus UAB Institut d’Estudis Espacials de Catalunya (IEEC) Department of Astronomy Xiamen University Purple Mountain Observatory Chinese Academy of Sciences School of Astronomy and Space Sciences University of Science and Technology of China Nevada Center for Astrophysics University of Nevada Department of Physics and Astronomy University of Nevada Department of Astronomy School of Physics and Technology Wuhan University School of Physics and Astronomy yunnan University Xinjiang Astronomical Observatory Chinese Academy of Sciences Université Paris Cité CNRS Astroparticule et Cosmologie Department of Astronomy University of Science and Technology of China Institute for Frontier in Astronomy and Astrophysics beijing Normal University Department of Astronomy beijing Normal University INAF–Osservatorio Astronomico di Brera INFN–sezione di Milano-Bicocca Dipartimento di Fisica Università di Roma “Sapienza” Institut de Recherche en Astrophysique et Planétologie UPS-OMP CNRS CNES yunnan Observatories Chinese Academy of Sciences Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences School of Astronomy and Space Science Nanjing University Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education School of Physics and Astronomy sun Yat-sen University max-Planck-Institut für Radioastronomie Institute for Cosmic Ray Research The University of Tokyo Key Laborat

The Einstein Probe(EP) is an interdisciplinary mission of time-domain and X-ray astronomy. Equipped with a wide-field lobstereye X-ray focusing imager, EP will discover cosmic X-ray transients and monitor the X-ray variability of known sources in 0.5-4 keV, at a combination of detecting sensitivity and cadence that is not accessible to the previous and current wide-field monitoring missions. EP can perform quick characterisation of transients or outbursts with a Wolter-I X-ray telescope onboard. In this paper, the science objectives of the EP mission are presented. EP is expected to enlarge the sample of previously known or predicted but rare types of transients with a wide range of timescales. Among them, fast extragalactic transients will be surveyed systematically in soft X-rays, which include γ-ray bursts and their variants, supernova shock breakouts, and the predicted X-ray transients associated with binary neutron star mergers. EP will detect X-ray tidal disruption events and outbursts from active galactic nuclei, possibly at an early phase of the flares for some. EP will monitor the variability and outbursts of X-rays from white dwarfs, neutron stars and black holes in our and neighbouring galaxies at flux levels fainter than those detectable by the current instruments, and is expected to discover new objects. A large sample of stellar X-ray flares will also be detected and characterised. In the era of multi-messenger astronomy, EP has the potential of detecting the possible X-ray counterparts of gravitational wave events, neutrino sources, and ultra-high energy γ-ray and cosmic ray sources. EP is expected to help advance the studies of extreme objects and phenomena revealed in the dynamic X-ray universe, and their underlying physical *** EP's strength in time-domain science, its follow-up telescope, with excellent performance, will also enable advances in many areas of X-ray astronomy.

关键词： Einstein Probe X-ray astronomy X-ray telescopes time-domain astronomy transients variability

利用相渗曲线探索递减率随含水率变化呈现的规律

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油气藏评价与开发 2025年第1期15卷 110-115,123页

作者：马培申孙宜丽舒政谭夜强余强张薇吴长虎齐勇中国石化河南油田分公司勘探开发研究院河南南阳474780 西南石油大学油气藏地质及开发工程全国重点实验室四川成都610500 中国石化河南油田分公司采油一厂河南南阳474780

为探究油田开发过程中不同含水率阶段产量递减率的变化情况。基于相渗曲线,研究了递减率、含水上升率、含水率三者之间的关系,建立了注采平衡的条件下递减率与含水率的关系,最后针对厚层油藏Z和多层油藏S进行实例计算分析。研究结果表明... 详细信息

为探究油田开发过程中不同含水率阶段产量递减率的变化情况。基于相渗曲线,研究了递减率、含水上升率、含水率三者之间的关系,建立了注采平衡的条件下递减率与含水率的关系,最后针对厚层油藏Z和多层油藏S进行实例计算分析。研究结果表明:在注采平衡的理想条件下,某一含水率阶段递减率受采液速度、束缚水饱和度的共同影响。递减率随着含水率的上升呈抛物线式变化,且递减率与采液速度成正比关系。在油藏确定的条件下,产量递减率大小主要由采液速度的大小决定,可通过调整井网密度、注采井数比等影响采液速度的参数控制产量递减。通过建立递减率与含水率的变化关系,明确产量递减变化规律的影响因素,为减缓产量递减对策提供依据。

关键词：递减率相渗曲线含水率含水上升率采液速度

Multi-boiler System Optimization in Integrated Steelworks Based on Decomposition and Coordination Method

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Journal of Iron and Steel Research International 2015年第3期22卷 226-231页

作者： Guang-yu ma Wen-qiang sun Wei-dong LI zhu YE Jiu-ju CAI Institute of Thermal and Environmental Engineering Northeastern University Ansteel Research Institute of Iron and Steel Anshan Iron and Steel Group Corporation

As for the existing problems of boilers in integrated steelworks, the multi-boiler system could be quantitatively optimized with the decomposition and coordination method. Then, case studies were carried out based on the data of an integrated steelworks. Two groups of actual production records were contrastively analyzed, and the calculation results from the optimized program of these two groups indicated that for groups 1 and 2, the costs fall by 5.06% and 3.79%and the fuel consumptions decrease by 2.72% and 1.45%, respectively, compared with the actual data. To analyze the cost and fuel consumption change under the same condition of total load demand, assigned fuel consumption and water temperature, five sets of data were selected for further analysis. It was shown that the total cost and fuel consumption of the optimized program could fall by 3.5% and 1.6% respectively, compared with the actual production records. The optimal allocation significantly contributed to energy conservation and cost reduction. The effects of the system energy conservation cannot be realized by single equipment energy conservation. They were complementary to each other, and should be put on the same stage.

关键词： boiler self-owned power plant integrated steelworks decomposition and coordination method