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arXiv 2023年

作者： Ye, Jing Raymond, John C. Mei, Zhixing Cai, Qiangwei Chen, Yuhao Li, Yan Lin, Jun Yunnan Observatories Chinese Academy of Sciences P.O. Box 110 Yunnan Kunming650216 China Yunnan Key Laboratory of Solar Physics and Space Science P.O. Box 110 Yunnan Kunming650216 China Yunnan Province China-Malaysia HF-VHF Advanced Radio Astronomy Technology International Joint Laboratory Yunnan Kunming650216 China Smithsonian Astrophysical Observatory 60 Garden Street MS 15 CambridgeMA02138 United States Institute of Space Physics Luoyang Normal University Henan Luoyang471934 China University of Chinese Academy of Sciences Beijing100049 China

Turbulence plays a key role for forming the complex geometry of the large-scale current sheet (CS) and fast energy release in a solar eruption. In this paper, we present full 3D high-resolution simulations for the process of a moderate Coronal Mass Ejection (CME) and the thermodynamical evolution of the highly confined CS. Copious elongated blobs are generated due to tearing and plasmoid instabilities giving rise to a higher reconnection rate and undergo the splitting, merging and kinking processes in a more complex way in 3D. A detailed thermodynamical analysis shows that the CS is mainly heated by adiabatic and numerical viscous terms, and thermal conduction is the dominant factor that balances the energy inside the CS. Accordingly, the temperature of the CS reaches to a maximum of about 20 MK and the range of temperatures is relatively narrow. From the face-on view in the synthetic Atmospheric Imaging Assembly 131 Å, the downflowing structures with similar morphology to supra-arcade downflows are mainly located between the post-flare loops and loop-top, while moving blobs can extend spikes higher above the loop-top. The downward-moving plasmoids can keep the twisted magnetic field configuration until the annihilation at the flare loop-top, indicating that plasmoid reconnection dominates in the lower CS. Meanwhile, the upward-moving ones turn into turbulent structures before arriving at the bottom of the CME, implying that turbulent reconnection dominates in the upper CS. The spatial distributions of the turbulent energy and anisotropy are addressed, which show a significant variation in the spectra with height. © 2023, CC BY-SA.

关键词： Turbulence

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A pathway to modify tribological behavior of Ni-W coating in various tribo-pairs: inhibition of delamination

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Wear 2025年 578-579卷

作者： Fan, Ze Zhang, Zhongquan Yu, Zhiyuan Chai, Ze Chen, Junfu Xu, Chen Yuan, Meng Wei, Guoying College of Materials and Chemistry China Jiliang University Hangzhou310018 China Ningbo Key Laboratory of Intelligent Inspection and Monitoring of Special Equipment Ningbo Special Equipment Inspection and Research Institute Ningbo315048 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province Zhejiang Academy of Special Equipment Science Hangzhou310020 China

In this work, a pathway to modify the tribological behavior of Ni–W alloy coatings in various tribo-pairs by inhibiting delamination is proposed based on the analysis of the wear performance and tribo-layers of the coating sliding against different counterparts. Adhesion, plastic deformation, and tribo-oxidation appear on the worn surface of the Ni–W coating. Delamination, which is related to the tribo-layer type, is found to dominate the material removal process of the Ni–W coatings. Plastic deformation and oxidation prompt the formation of a mechanical mixed layer (MML) and an oxide layer (OL) on worn surface of the Ni–W coating as it slides against the metal counterparts. AISI 52100, which has a high hardness and deformation resistance, can lead to the formation of a large-area MML around the OL and reduce the tribo-layer delamination. Tribo-oxidation controls the formation and detachment of the protective OL during the wear process of the Ni–W coating as it slides against the ceramic counterparts. Decreasing the tribo-chemical reaction activity of the coutact surfaces between the Ni–W coating and the counterparts could diminish OL delamination. Owing to their high deformation resistance and thermal conductivity, WC–Co composite can highly improve the tribological performance of the Ni–W coating by inhibiting delamination. These results not only advance the understanding of wear mechanisms but also offer a pathway to modify the tribological performance of Ni–W coating and provide a reference for the design of tribo-pairs. © 2025 Elsevier B.V.

关键词： Nickel coatings

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Effect of cold expansion on fatigue life of anodized Al alloy 2

Effect of cold expansion on fatigue life of anodized Al allo...

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2nd International Symposium on Application of Materials science and Energy Materials, SAMSE 2018

作者： Li, Nan Li, Haitao Liu, Hongtao Liu, Changkui AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation Key Laboratory of Science and Technology On Materials Testing and Evaluation Beijing100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China Structure Department Shenyang Aircraft Design Research Institute Shenyang110035 China

Anodizing treatment can improve corrosion resistance of aluminum alloy but decrease the fatigue life significantly. Introducing cold expansion before anodizing can increase the fatigue life of the specimen with open-hole structure by 2582% than the anodized one. Scanning electron microscopy (SEM) was employed for microstructure and fracture surface observation. Residual stress distribution near the sample hole edge was measured to elucidate the strengthening mechanism. The results revealed that although anodizing treatment decreases the surface integrity, the cold expansion is an effective method to improve the open-hole structure specimen remarkably. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Corrosion resistance

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LncRNA CA13/EFTUD2/CA13 caused crossed beak by regulating the mandibular calcification in chicken

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Poultry science 2025年第8期104卷 105373页

作者： Wu, Min Su, Dan Li, Xinxin Xu, Junjie Fan, Yihao Wu, Xinglin Liu, Xuelu Su, Bofei Wang, Dehe Chen, Yifan Hao, Erying Bai, Hao Chen, Hui Chen, Jilan Shi, Lei College of Animal Science and Technology Hebei Agricultural University Hebei Baoding 071001 China BeijingHuadu Yukou Poultry Industry Co. Ltd Beijing 101200 China Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of China Institutes of Agricultural Science and Technology Development Yangzhou University Yangzhou 225009 China State Key Laboratory of Animal Biotech Breeding Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction Ministry of Agriculture and Rural Affairs Institute of Animal Science Chinese Academy of Agricultural Sciences Beijing 100193 China

Crossed beak is a beak deformity that reduces feeding and drinking in affected chickens, thereby diminishing chicken production performance. Previous studies have shown that long non-coding RNA CA13 (lncRNA CA13), as an upstream regulator of carbonic anhydrase 13 (CA13), exhibited down-regulated expression in the lateral mandibular condyles of the short bone branch in cross-beaked chickens along with CA13. The study investigated the expression characteristics of lncRNA CA13 and its regulatory relationship with CA13 and elongation factor Tu GTP-binding domain-containing protein 2 (EFTUD2), laying the groundwork for the molecular mechanisms of lncRNA CA13 in chicken mandibular mineralization. The length of lncRNA CA13, amplified by 5′ and 3′ rapid amplification of cDNA ends (RACE) technique, was 2380 bp. Expression of lncRNA CA13 was significantly higher in mandibular condylar tissues compared to other tissues (P < 0.01). Using a successfully constructed osteoblast-induced differentiation model, orange calcified nodules were observed under the microscope after alizarin red staining, and the expressions of CA13, lncRNA CA13, runt-related transcription factor 2 (RUNX2), and alkaline phosphatase (ALP) were also detected to be significantly higher than those before induction (P < 0.01;P < 0.05). Integrated RNA affinity pull-down assay (RNA pull-down) combined with multiple bioinformatic analysis methods, as well as RNA binding protein immunoprecipitation assay (RIP), identified EFTUD2 as a transcription factor involved in the cellular mineralization process. The oe-lncRNA CA13 vector was constructed with an overexpression efficiency of 95.85 %, and the sh-lncRNA CA13 vector had an interference efficiency of 54.58 %. Overexpression of lncRNA CA13 significantly upregulated EFTUD2 and downregulated CA13;simultaneous interference with lncRNA CA13 significantly downregulated EFTUD2 and upregulated CA13. Thus, the lncRNA CA13/EFTUD2/CA13 axis plays a key role in the development

关键词： Calcification Chicken Crossed beak lncRNA CA13/EFTUD2/CA13 Mandible

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The ALMA-ATOMS survey: A sample of weak hot core candidates identified through line stacking

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Astronomy and Astrophysics 2025年第1期697卷

作者： Li, Zi-Yang Liu, Xunchuan Liu, Tie Qin, Sheng-Li Goldsmith, Paul F. García, Pablo Peng, Yaping Chen, Li Jiao, Yunfan Kou, Zhiping Li, Chuanshou Zou, Jiahang Tang, Mengyao Li, Shanghuo Liu, Meizhu Garay, Guido Xu, Fengwei Jiao, Wenyu Luo, Qiu-Yi Zhang, Suinan Gu, Qi-Lao Mai, Xiaofeng Zhang, Yan-Kun Weng, Jixiang Lee, Chang Won Sanhueza, Patricio Dib, Sami Das, Swagat R. Tang, Xindi Bronfman, Leonardo Gorai, Prasanta Tatematsu, Ken’Ichi Liu, Hong-Li Yang, Dongting Zhang, Zhenying Shen, Xianjin School of Physics and Astronomy Yunnan University Kunming650091 China Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China Instituto de Astronomía Universidad Católica del Norte Av. Angamos 0610 Antofagasta Chile Department of Physics Faculty of Science Kunming University of Science and Technology Kunming650500 China University of Chinese Academy of Sciences Beijing100049 China Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1-Stree Urumqi830011 China Institute of Astrophysics School of Physics and Electronical Science Chuxiong Normal University Chuxiong675000 China School of Astronomy and Space Science Nanjing University 163 Xianlin Avenue Nanjing210023 China Ministry of Education Nanjing210023 China Center for Astrophysics Guangzhou University Guangzhou510006 China Departamento de Astronomía Universidad de Chile Las Condes Santiago7591245 Chile I. Physikalisches Institut Universität zu Köln Zülpicher Straße 77 Köln50937 Germany Kavli Institute for Astronomy and Astrophysics Peking University 5 Yiheyuan Road Haidian District Beijing100871 China Korea Astronomy and Space Science Institute 776 Daedeokdaero Yuseong-gu Daejeon34055 Korea Republic of University of Science and Technology 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of Department of Earth and Planetary Sciences Institute of Science Tokyo Meguro Tokyo152-8551 Japan National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka181-8588 Japan Department of Astronomy School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Max Planck Institute for Astronomy Königstuhl 17 Heidelberg691

Context. Hot cores represent critical astrophysical environments for high-mass star formation, distinguished by their rich spectra of organic molecular emission lines. Nevertheless, comprehensive statistical analyses of extensive hot core samples remain relatively scarce in current astronomical ***. We aim to utilize high-angular-resolution molecular line data from the Atacama Large Millimeter and Submillimeter Array (ALMA) to identify hot cores, with a particular focus on weak-emission candidates, and to provide one of the largest samples of hot core candidates to ***. We propose to use spectral stacking and imaging techniques of complex organic molecules (COMs) in the ALMA-ATOMS survey, including line identification and weights, segmentation of line datacubes, resampling, stacking and normalization, moment 0 maps, and data analysis, to search for hot core candidates. The molecules involved include CH3OH, CH3OCHO, C2H5CN, C2H5OH, CH3OCH3, CH3COCH3, and CH3CHO. We classify cores with dense emission of CH3OH and at least one molecule from the other six molecules as hot core ***. In addition to the existing sample of 60 strong hot cores from the ALMA-ATOMS survey, we have detected 40 new weak candidates through stacking. All hot core candidates display compact emission from at least one of the other six COM species. For the strong sample, the stacking method provides molecular column density estimates that are consistent with previous fitting results. For the newly identified weak candidates, all species except CH3CHO show compact emission in the stacked image, which cannot be fully resolved spatially. These weak candidates exhibit column densities of COMs that are approximately one order of magnitude lower than the ones of the strong sample. The entire hot core sample, including the weak candidates, reveals tight correlations between the compact emission of CH3OH and other COM species, suggesting they may share a similar chemical env

关键词： Moon

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A two-stage solution to quantum process tomography: error analysis and optimal design

arXiv

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arXiv 2024年

作者： Xiao, Shuixin Wang, Yuanlong Zhang, Jun Dong, Daoyi Mooney, Gary J. Petersen, Ian R. Yonezawa, Hidehiro School of Engineering and Technology University of New South Wales CanberraACT2600 Australia University of Michigan–Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai200240 China School of Engineering The Australian National University CanberraACT2601 Australia Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China CIICADA Lab School of Engineering Australian National University ACT2601 Australia School of Physics The University of Melbourne ParkvilleVIC3010 Australia School of Physics University of Melbourne ParkvilleVIC3010 Australia School of Engineering Australian National University ACT2601 Australia RIKEN Center for Quantum Computing Japan Centre for Quantum Computation and Communication Technology Australian Research Council CanberraACT2600 Australia

Quantum process tomography is a critical task for characterizing the dynamics of quantum systems and achieving precise quantum control. In this paper, we propose a two-stage solution for both trace-preserving and non-trace-preserving quantum process tomography. Utilizing a tensor structure, our algorithm exhibits a computational complexity of O(MLd2) where d is the dimension of the quantum system and M, L represent the numbers of different input states and measurement operators, respectively. We establish an analytical error upper bound and then design the optimal input states and the optimal measurement operators, which are both based on minimizing the error upper bound and maximizing the robustness characterized by the condition number. Numerical examples and testing on IBM quantum devices are presented to demonstrate the performance and efficiency of our algorithm. Copyright © 2024, The Authors. All rights reserved.

关键词： Error analysis

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The Jiutian simulations for the CSST extra-galactic surveys

arXiv

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arXiv 2025年

作者： Han, Jiaxin Li, Ming Jiang, Wenkang Chen, Zhao Wang, Huiyuan Wei, Chengliang He, Feihong He, Jianhua Zhang, Jiajun Liu, Yu Cui, Weiguang Gu, Yizhou Guo, Qi Jing, Yipeng Kang, Xi Li, Guoliang Luo, Xiong Luo, Yu Pei, Wenxiang Tan, Zhenlin Xie, Lizhi Yang, Xiaohu Yu, Hao-Ran Yu, Yu Qiu, Yisheng Zhou, Jiale Department of Astronomy School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University Shanghai200240 China Key Laboratory for Computational Astrophysics National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Department of Astronomy University of Science and Technology of China Anhui Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Purple Mountain Observatory Nanjing210008 China School of Astronomy and Space Science Nanjing University Nanjing210093 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China Department of Astronomy Tsinghua University Beijing100084 China Departamento de Física Teórica Universidad Autónoma de Madrid M-8 Cantoblanco Madrid28049 Spain Facultad de Ciencias Universidad Autónoma de Madrid MadridE-28049 Spain Institute for Astronomy University of Edinburgh Royal Observatory EdinburghEH9 3HJ United Kingdom Institute for Astronomy School of Physics Zhejiang University Hangzhou310027 China Department of Physics School of Physics and Electronics Hunan Normal University Changsha410081 China Shanghai Key Lab for Astrophysics Shanghai Normal University Shanghai200234 China Tianjin Normal University Tianjin300387 China Department of Astronomy Xiamen University Fujian Xiamen361005 China Research Center for Astronomical Computing Zhejiang Laboratory Hangzhou China

We provide an overview of the Jiutian simulations, a hybrid simulation suite for the China Space Survey Telescope (CSST) extragalactic surveys. It consists of four complementary modules: the primary runs with high resolutions under the fiducial concordance cosmology, the emulator runs exploring the parameter uncertainties around the fiducial cosmology, the reconstruction runs intended for recovering the observed Universe site by site, and the extension runs employing extended cosmologies beyond the standard model. For the primary runs, two independent pipelines are adopted to construct subhaloes and merger trees. On top of them, four sets of mock galaxy light-cone catalogs are produced from semi-analytical models and subhalo abundance matching, providing a variety of observational properties including galaxy SED, emission lines, lensing distortions, and mock images. The 129 emulator runs are used to train the CSST emulator, achieving one percent accuracy in predicting a variety of cosmological statistics over k ≤ 10hMpc−1 and z ≤ 2. The reconstruction runs employ a number of subgrid baryonic models to predict the evolution and galaxy population of certain regions in the real Universe with constrained initial conditions, enabling controlled investigation of galaxy formation on top of structure formation. The extension runs cover models with warm dark matter, f(R) gravity, interacting dark energy, and nonzero neutrino masses, revealing differences in the cosmic structure under alternative cosmological models. We introduce the specifications for each run, the data products derived from them, the corresponding pipeline developments, and present some main tests. Using the primary runs, we also show that the subhalo peak mass functions of different levels are approximately universal. These simulations form a comprehensive and open simulation library for CSST survey preparation and future scientific analysis. © 2025, CC BY.

关键词： Dark Matter

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Machine learning combined with fusion of multiple sources of polysaccharide data based on hydrophilic interaction chromatography-charged aerosol detection for geographical origin discrimination of American ginseng (Panax quinquefolius)

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Journal of Food Composition and analysis 2025年 144卷

作者： Hu, Simeng Guo, Huanying Yuan, Yuan Yuan, Haoping Zhao, Zhiguo Guo, Lanping Wang, Xiao Zhao, Hengqiang Shandong Engineering Research Center for Innovation and Application of General Technology for Separation of Natural Products Shandong Analysis and Test Center Qilu University of Technology (Shandong Academy of Sciences) Jinan 250014 China Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province School of Pharmaceutical Sciences Qilu University of Technology (Shandong Academy of Sciences) Jinan 250014 China National Resource Center for Chinese Materia Medica China Academy of Chinese Medical Sciences State Key Laboratory Breeding Base of Dao-di Herbs Beijing 100700 China The First School of Clinical Medicine Heilongjiang University of Chinese Medicine Harbin 150040 China

American ginseng (Panax quinquefolius) is globally popular because of its medicinal and edible value. A geographical origin identification study is urgent to prevent economic adulteration. The aim of this study was to propose an integrated strategy via combining machine learning with fusion of multisource polysaccharide data based on hydrophilic interaction chromatography-charged aerosol detection for the geographical origin identification of American ginseng. Four machine learning algorithms (SVM, MLP, LDA and GBDT) combined with single or multisource polysaccharides (monosaccharide composition and polysaccharide depolymerized products profile) data were evaluated for the geographical origin authentication of American ginseng samples from different regions. As a result, most of the machine learning algorithms combined with low-level polysaccharide data fusion exhibited better classification efficiency than the single or middle-level fusion data. Among them, LDA can satisfactorily classify the American ginseng samples for both between the protected designation of origin (PDO) and non-PDO or among the non-PDO regions with 100 % accuracy for both the training and test sets. Thus, this study proved that the developed multisource of polysaccharide data fusion assisted by machine learning had great potential in the geographical origin authentication of American ginseng, which could also be used for the authenticity research of other foods rich in polysaccharides. © 2025 Elsevier Inc.

关键词： American ginseng Data fusion Geographical authentication Machine learning Monosaccharide composition Polysaccharide depolymerized products’ profile

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Emissions and reduction potential of greenhouse gas derived from facility cultivation production: Evidence from China

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Environmental Development 2025年 56卷

作者： Yan Yin Xiaoyu Zhang Fengming Xi Jiaoyue Wang Longfei Bing Qinqin Hu Jie Lv Zhanxiang Sun Institute of Applied Ecology Chinese Academy of Science 110016 Shenyang China Key Laboratory of Pollution Ecology and Environment Engineering 110016 Shenyang China Key Laboratory of Terrestrial Ecosystem Carbon Neutrality Liaoning Province 110016 Shenyang China National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process Liaoning Province 110016 Shenyang China University of Chinese Academy of Sciences 100049 Beijing China University of Science and Technology Beijing 100083 Beijing China Shenyang Agricultural University 110866 Shenyang China Liaoning Academy of Agricultural Sciences 110161 China

Facility cultivation, a high-input agricultural system critical for food security in China, exhibits disproportionately large greenhouse gas emissions compared to open-field agriculture, yet its emission dynamics remain underexplored. This study develops a comprehensive life-cycle accounting framework to quantify facility cultivation-related greenhouse gas emissions across China's three primary greenhouse types—plastic, solar, and multi-span greenhouses—from 2008 to 2020, while addressing previously overlooked emission sources including agricultural plastic films, climate-control energy use, CO 2 fertilization, and organic matter mineralization. Utilizing the Logarithmic Mean Divisia Index model and scenario analysis, we identify key drivers of emissions and evaluate mitigation potentials. Results revealed that facility cultivation emitted 122.05–371.96 Mt CO 2 equiv. yr −1 , with emission intensities (83–226 t CO 2 equiv. ha −1 ). Soil organic matter decomposition and energy consumption were dominant sources, collectively contributing 67 % of total emissions. Decomposition analysis highlighted agricultural structure expansion (199.23 Mt CO 2 equiv.) and emission efficiency improvements (−213.96 Mt CO 2 equiv.) were primary promotive and mitigative drivers, respectively. Spatial heterogeneity underscored Liaoning Province's disproportionately high emissions, driven by coal-dependent heating, aging infrastructure, and policy incentives. Scenario projections demonstrated an 18.57 % reduction potential through integrated strategies such as clean energy adoption and cultivation structural optimization. These findings establish a refined analytical framework for spatially differentiated mitigation policies, directly supporting China's carbon neutrality roadmap while balancing agricultural productivity and environmental sustainability.

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The mini-GWAC optical follow-up of gravitational wave alerts – results from the O2 campaign and prospects for the upcoming O3 run

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Research in Astronomy and Astrophysics 2020年第1期20卷 107-123页

作者： Damien Turpin Chao Wu Xu-Hui Han Li-Ping Xin Sarah Antier Nicolas Leroy Li Cao Hong-Bo Cai Bertrand Cordier Jin-Song Deng Wen-Long Dong Qi-Chen Feng Lei Huang Lei Jia Alain Klotz Cyril Lachaud Hua-Li Li En-Wei Liang Shun-Fang Liu Xiao-Meng Lu Xian-Min Meng Yu-Lei Qiu Hui-Juan Wang Jing Wang Shen Wang Xiang-Gao Wang Jian-Yan Wei Bo-Bing Wu Yu-Jie Xiao Da-Wei Xu Yang Xu Yuan-Gui Yang Pin-Pin Zhang Ruo-Song Zhang Shuang-Nan Zhang Ya-Tong ZhengandSi-Cheng Zou Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China LAL Univ.Paris-SudCNRS/IN2P3Universite Paris-SaclayF-91898 OrsayFrance APC Univ Paris DiderotCNRS/IN2P3CEA/lrfuObs de ParisSorbonne Paris CiteFrance CEA Saclay DRF/IRFU/Departement d’astrophysique91191 Gif-sur-YvetteFrance School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 101408China Universite de Toulouse IRAP 14 Av.Edouard BelinF-31000 ToulouseFrance Institut de Recherche en Astrophysique et Planetologie(IRAP) UPS-OMPToulouseFrance Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China

The second(O2)observational campaign of gravitational waves(GWs)organized by the LIGO/Virgo Collaborations has led to several breakthroughs such as the detection of GW signals from merger systems involving black holes or neutrons *** O2,14 GW alerts were sent to the astronomical community with sky regions mostly covering over hundreds of square *** them,six were finally confirmed as real astrophysical *** 2013,a new set of ground-based robotic telescopes called Ground-based Wide Angle Camera system(GWAC)project and its pathfinder mini-GWAC has been developed to contribute to the various challenges of multi-messenger and time domain *** GWAC system is built up in the framework of the ground-segment system of the SVOM mission that will be devoted to the study of the multi-wavelength transient sky in the next *** O2,only the mini-GWAC telescope network was fully *** to the wide field of view and fast automatic follow-up capabilities of the mini-GWAC telescopes,they were adept to efficiently cover the sky localization areas of GW event *** this paper,we present the mini-GWAC pipeline we have set up to respond to GW alerts and we report our optical follow-up observations of eight GW alerts detected during the O2 *** observations provided the largest coverage of the GW localization areas with a short latency made by any optical *** found tens of optical transient candidates in our images,but none of those could be securely associated with any confirmed black hole-black hole merger *** on this first experience and the near future technical improvements of our network system,we will be more competitive in detecting the optical counterparts from some GW events that will be identified during the upcoming O3 run,especially those emerging from binary neutron star mergers.

关键词： gravitational waves methods:data analysis methods:observational (stars:)gammaray burst:general

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