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fatigue Properties Improvement of low-Carbon Alloy Axle Steel by Induction hardening and Shot Peening:A Prospective Comparison

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Acta Metallurgica Sinica(English letters) 2022年第8期35卷 1343-1356页

作者： G.C.Chu f.Z.hu x.j.jin Y.Zhang Q.Wang j.P.hou Z.f.Zhang Shi-Changxu Innovation Center for Advanced Material Institute of Metal ResearchChinese Academy of SciencesShenyang 110016.China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Manshan Iron and Steel Co. Ltd.Maanshan 243000China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baowu Group Masteel Rail Transit Materials Technology Company limited Maanshan 243000China

fatigue fracture is the major threat to the railway axle, which can be avoided or delayed by surface strengthening. In this study, a low-carbon alloy axle steel with two states was treated by surface induction hardening and shot peening, respectively, to reveal the mechanism of fatigue property improvement by microstructure characterization, microhardness measurement, residual stress analysis, roughness measurement, and rotary bending fatigue tests. The results indicate that both quenching and tempering treatment can effectively improve the fatigue properties of the modified axle steel. In addition, induction hardening can create an ideal hardened layer on the sample surface by phase transformation from the microstructure of ferrite and pearlite to martensite. By comparison, shot peening can modify the microstructure in surface layer by surface severe plastic deformation introducing a large number of dislocation and even cause grain refinement. Both induction hardening and shot peening create compressive residual stress into the surface layer of axle steel sample, which can effectively reduce the stress level applied to the metal surface during the rotary bending fatigue tests. On the whole, the contribution of induction hardening to the fatigue life of axle steel sample is better than that of the shot peening, and induction hardening shows obvious advantages in improving the fatigue life of axle steel.

关键词： Surface strengthening Induction hardening Shot peening Axle steel fatigue property improvement

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Construction of an anchoring SSR marker genetic linkage map and detection of a sex-linked region in two dioecious populations of red bayberry

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horticulture Research 2020年第1期7卷 2262-2270页

作者： Yan Wang hui-Min jia Yu-tong Shen hai-Bo zhao Qin-Song Yang Chang-Qing Zhu De-li sun Guo-Yun Wang Chao-Chao Zhou Yun jiao Chun-Yan Chai li-ju Yan xiong-Wei li hui-juan jia Zhong-Shan Gao fruit Science Institute College of Agriculture and BiotechnologyZhejiang University310058 HangzhouChina shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of Sciences201602 ShanghaiChina Yuyao forestry Technology Extension Center 315400 NingboChina Institute of forestry Ningbo Academy of Agricultural ScienceNingboChina Cixi forestry Technology Extension Center 315300 CixiChina linhai forestry Technology Extension Center 317000 TaizhouChina forest&fruit Tree Institute Shanghai Academy of Agricultural Sciences201403 ShanghaiChina

Red bayberry(Morella rubra)is an evergreen fruit tree found in southern china whose whole-genome sequence has recently been *** updated the linkage map of the species by adding 118 SSR markers and the femalespecific marker MrfT2_*** integrated map included eight linkage groups and spanned 491 *** sexassociated markers were identified,six of which were located in linkage group 8,in agreement with the previously reported location of the sex-determining *** MrfT2_BD-SEx marker was genotyped in 203 cultivated *** the females of the accessions,we found two female-specific alleles,designated W-b(151 bp)and W-d(129 bp).We previously found that‘Dongkui’,a female cultivar,could produce viable pollen(we refer to such plants‘Dongkui-male’)and serve as the paternal parent in *** genotypes of the MrfT2_BD-SEx marker were W-b/Z in‘Biqi’and W-d/Z in‘Dongkui-male’.The progeny of a cross between these parents produced a 3:1 female(W-)to male(ZZ)ratio and the expected 1:1:1:1 ratio of W-b/W-d:W-b/Z:W-d/Z:Z/*** addition,the flowering and fruiting phenotypes of all the f1 progeny fit their *** results confirm the existence of ZW sex determination and show that the female phenotype is controlled by a single dominant locus(W)in a small genomic region(59 kb and less than 3.3 cM).furthermore,we have produced a homozygous“super female”(WW)that should produce all-female offspring in the f2 generation,providing a foundation for commercial use and presenting great potential for use in modern breeding programs.

关键词： breeding cultivar linkage

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Mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions

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journal of Magnesium and Alloys 2017年第4期5卷 423-429页

作者： j.h.he l.jin f.h.Wang S.Dong j.Dong National Engineering Research Center of light Alloy Net forming Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240PR China

The Mg-Gd-Y-Zn-Zr alloys are representational and potential age-hardening systems as reported in the past ten years,but their mechanical properties are still dependent on the grain size and its *** effect of bimodal structure on mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions was *** results suggested that the volume fraction of fine grain(fG)and coarse grain(CG)could be controlled by combined processes of hot forging,extrusion and *** for the present alloys with bimodal grain size distribution,the improvement of strength is still attributed to the grain *** morphology of bimodal grain size distribution has a marked impact on the ductility of the alloy,*** the increase of coarse grain volume fraction,the elongation to failure increases at the beginning and then *** mechanism of the toughening effect of bimodal grain size distribution on the Mg-Gd-Y-Zn-Zr alloys with bimodal grain size structure has been discussed.

关键词： Mg-Gd-Y-Zr alloy forging Extrusion Bimodal grain size distribution Mechanical properties

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Measurements of the center-of-mass energies of e^(+)e^(-)collisions at BESIII

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Chinese Physics C 2021年第10期45卷 7-15页

作者： M.Ablikim M.N.Achasov P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An Q.An x.h.Bai Y.Bai O.Bakina R.Baldini ferroli I.Balossino Y.Ban K.Begzsuren N.Berger M.Bertani D.Bettoni f.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere h.Cai x.Cai A.Calcaterra G.f.Cao N.Cao S.A.Cetin j.f.Chang W.l.Chang G.Chelkov D.Y.Chen G.Chen h.S.Chen M.l.Chen S.j.Chen x.R.Chen Y.B.Chen Z.j.Chen W.S.Cheng G.Cibinetto f.Cossio x.f.Cui h.l.Dai x.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis f.De Mori Y.Ding C.Dong j.Dong l.Y.Dong M.Y.Dong x.Dong S.x.Du Y.l.fan j.fang S.S.fang Y.fang R.farinelli l.fava f.feldbauer G.felici C.Q.feng j.h.feng M.fritsch C.D.fu Y.Gao Y.Gao Y.Gao Y.G.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen l.Gong W.x.Gong W.Gradl M.Greco l.M.Gu M.h.Gu Y.T.Gu C.Y Guan A.Q.Guo l.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.han W.Y.han x.Q.hao f.A.harris K.l.he f.h.heinsius C.h.heinz T.held Y.K.heng C.herold M.himmelreich T.holtmann G.Y.hou Y.R.hou Z.l.hou h.M.hu j.f.hu T.hu Y.hu G.S.huang l.Q.huang x.T.huang Y.P.huang Z.huang T.hussain N husken W.Ikegami Andersson W.Imoehl M.Irshad S.jaeger S.janchiv Q.ji Q.P.ji x.B.ji x.l.ji Y.Y.ji h.B.jiang x.S.jiang j.B.jiao Z.jiao S.jin Y.jin M.Q.jing T.johansson N.Kalantar-Nayestanaki x.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt l.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc M.G.Kurth W.Kuhn j.j.lane j.S.lange P.larin A.lavania l.lavezzi Z.h.lei h.leithoff M.lellmann T.lenz C.li C.h.li Cheng li D.M.li f.li G.li h.li h.li h.B.li h.j.li j.l.li j.Q.li j.S.li Ke li l.K.li lei li P.R.li S.Y.li W.D.li W.G.li x.h.li x.l.li xiaoyu li Z.Y.li h.liang h.liang h.liang Y.f.liang Y.T.liang G.R.liao l. Z. liao j.libby C.x.lin B.j.liu C.x.liu D.liu f.h.liu fang liu feng liu h.B.liu h.M.liu huanhuan liu huihui liu j.B.liu j.l.liu j.Y.liu K.liu K.Y.liu l.liu M.h.liu P.l.liu Q.liu Q.liu S.B.liu Shuai liu T.liu W.M.liu x.liu Y.liu Y.B.liu Z.A.liu Z.Q.liu x.C.lou f.x.lu h.j.lu j.D.lu j.G.lu x.l.lu Y.lu Y.P.lu C.l.luo Institute of high Energy Physics Beijing 100049China Beihang university Beijing 100191China Beijing Institute of Petrochemical Technology Beijing 102617China Bochum Ruhr-university D-44780 BochumGermany Carnegie Mellon university PittsburghPennsylvania 15213USA Central china Normal university Wuhan 430079China china Center of Advanced Science and Technology Beijing 100190China COMSATS university Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan fudan university Shanghai 200443China G.I.Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia GSI helmholtzcentre for heavy Ion Research Gmbh D-64291 DarmstadtGermany Guangxi Normal university Guilin 541004China Guangxi university Nanning 530004China hangzhou Normal university Hangzhou 310036China helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany henan Normal university Xinxiang 453007China henan university of Science and Technology Luoyang 471003China huangshan College Huangshan 245000China hunan Normal university Changsha 410081China hunan university Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana university BloomingtonIndiana 47405USA INfN laboratori Nazionali di frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INfN laboratori Nazionali di frascati INFN Sezione di PerugiaI-06100PerugiaItaly INfN laboratori Nazionali di frascati University of PerugiaI-06100PerugiaItaly INfN Sezione di ferrara INFN Sezione di FerraraI-44122FerraraItaly INfN Sezione di ferrara University of FerraraI-44122FerraraItaly 25Institute of Modern PhysicsLanzhou 730000China Institute of Modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Ave.54BUlaanbaatar 13330Mongolia jilin university Changchun 130012China johannes Gutenberg university of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-liebig-Universitaet Giessen II.Physikali

During the 2016-17 and 2018-19 running periods,the BESIII experiment collected 7.5 fb of e^(+)e^(-)collision data at center-of-mass energies ranging from 4.13 to 4.44 *** data samples are primarily used for the study of excited charmonium and charmoniumlike *** analyzing the di-muon process e^(+)e^(-)→(γISR=fSR)μ^(+)μ^(-),we measure the center-of-mass energies of the data samples with a precision of 0.6 *** a run-by-run study,we find that the center-of-mass energies were stable throughout most of the data-collection period.

关键词： center-of-mass energy e^(+)e^(-) annihilation BESIII

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Observation of the Y(4230)and a new structure in e^(+)e^(-)→K^(+)K^(-)j/Ψ

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Chinese Physics C 2022年第11期46卷 7-21页

作者： M.Ablikim M.N.Achasov P.Adlarson M.Albrecht R.Aliberti A.Amoroso M.R.An Q.An x.h.Bai Y.Bai O.Bakina R.Baldini ferroli I.Balossino Y.Ban V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni f.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann h.Cai x.Cai A.Calcaterra G.f.Cao N.Cao S.A.Cetin j.f.Chang W.l.Chang G.Chelkov C.Chen G.Chen h.S.Chen M.l.Chen S.j.Chen T.Chen x.R.Chen x.T.Chen Y.B.Chen Z.j.Chen W.S.Cheng x.Chu G.Cibinetto f.Cossio j.j.Cui h.l.Dai j.P.Dai A.Dbeyssi R.Ede Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis f.De Mori Y.Ding j.Dong l.Y.Dong M.Y.Dong x.Dong S.x.Du P.Egorov Y.l.fan j.fang S.S.fang W.x.fang Y.fang R.farinelli l.fava f.feldbauer G.felici C.Q.feng j.h.feng K fischer M.fritsch C.fritzsch C.D.fu h.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen l.Gong W.x.Gong W.Gradl M.Greco M.h.Gu C.Y Guan A.Q.Guo l.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.han W.Y.han x.Q.hao f.A.harris K.K.he K.l.he f.h.heinsius C.h.heinz Y.K.heng C.herold M.himmelreich T.holtmann G.Y.hou Y.R.hou Z.l.hou h.M.hu j.f.hu T.hu Y.hu G.S.huang K.x.huang l.Q.huang l.Q.huang x.T.huang Y.P.huang Z.huang T.hussain N husken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv Q.ji Q.P.ji x.B.ji x.l.ji Y.Y.ji Z.K.jia h.B.jiang S.S.jiang x.S.jiang Y.jiang j.B.jiao Z.jiao S.jin Y.jin M.Q.jing T.johansson N.Kalantar-Nayestanaki x.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt l.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kuhn j.j.lane j.S.lange P.larin A.lavania l.lavezzi Z.h.lei h.leithoff M.lellmann T.lenz C.li C.li C.h.li Cheng li D.M.li f.li G.li h.li h.li h.B.li h.j.li h.N.li j.Q.li j.S.li j.W.li Ke li l.j li l.K.li lei li M.h.li P.R.li S.x.li S.Y.li T.li W.D.li W.G.li x.h.li x.l.li xiaoyu li Z.Y.li h.liang h.liang h.liang Y.f.liang Y.T.liang G.R.liao l.Z.liao j.libby A.limphirat C.x.lin D.x.lin T.lin B.j.liu C.x.liu D.liu f.h.liu fang liu feng liu G.M.liu h.liu h.M.liu huanhuan liu huihui liu j.B.liu j.l.liu j.Y.liu K.liu K.Y.l Institute of high Energy Physics Beijing 100049China Beihang university Beijing 100191China Beijing Institute of Petrochemical Technology Beijing 102617China Bochum Ruhr-university D-44780 BochumGermany Carnegie Mellon university PittsburghPennsylvania 15213USA Central china Normal university Wuhan 430079China china Center of Advanced Science and Technology Beijing 100190China COMSATS university Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan fudan university Shanghai 200433China G.I.Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia GSI helmholtzcentre for heavy Ion Research Gmbh D-64291 DarmstadtGermany Guangxi Normal university Guilin 541004China hangzhou Normal university Hangzhou 310036China helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany henan Normal university Xinxiang 453007China henan university of Science and Technology Luoyang 471003China henan university of Technology Zhengzhou 450001China huangshan College Huangshan 245000China hunan Normal university Changsha 410081China hunan university Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana university BloomingtonIndiana 47405USA INfN laboratori Nazionali di frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INfN laboratori Nazionali di frascati INFN Sezione di PerugiaI-06100PerugiaItaly INfN laboratori Nazionali di frascati University of PerugiaI-06100PerugiaItaly INfN Sezione di ferrara INFN Sezione di FerraraI-44122FerraraItaly INfN Sezione di ferrara University of FerraraI-44122FerraraItaly Institute of Modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Ave.54BUlaanbaatar 13330Mongolia jilin university Changchun 130012China johannes Gutenberg university of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-liebig-Universitaet Giessen II.Physikalisches InstitutHeinrich-Buff-Ring 16

The cross sections of e^(+)e^(-)→K^(+)K^(-)j/Ψat center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb-1data collected with the BESⅢ detector operating at the BEPCⅡ storage *** resonant structures are observed in the line shape of the cross *** mass and width of the first structure are measured to be(4225.3±2.3±21.5)MeV and(72.9±6.1±30.8)MeV,*** are consistent with those of the established Y(4230).The second structure is observed for the first time with a statistical significance greater than 8σ,denoted as Y(4500).Its mass and width are determined to be(4484.7±13.3±24.1)MeV and(111.1±30.1±15.2)MeV,*** first presented uncertainties are statistical and the second ones are *** product of the electronic partial width with the decay branching fractionΓ(Y(4230)→e^(+)e^(−))B(Y(4230)→K^(+)K^(−)j/Ψ)is reported.

关键词： Y states charmonium-like states BESⅢ

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line-of-shower trigger method to lower energy threshold for GRB detection using lhAASO-WCDA

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Radiation Detection Technology and Methods 2021年第4期5卷 531-541页

作者： f.Aharonian Q.An Axikegu l.x.Bai Y.x.Bai Y.W.Bao D.Bastieri x.j.Bi Y.j.Bi h.Cai j.T.Cai Z.Cao Z.Cao j.Chang j.f.Chang x.C.Chan B.M.Chen j.Chen l.Chen l.Chen l.Chen M.j.Chen M.l.Chen Q.h.Chen S.h.Chen S.Z.Chen T.l.Chen x.l.Chen Y.Chen N.Chen Y.D.Chen S.W.Cui x.h.Cui Y.D.Cui B.Z.Dai h.l.Dai Z.G.Dai Danzengluobu D.della Volpe B.D’Ettorre Piazzoli x.j.Don j.h.fan Y.Z.fan Z.x.fan j.fang K.fan C.f.feng l.feng S.h.fen Y.l.feng B.Gao C.D.Gao Q.Gao W.Gao M.M.Ge l.S.Gen G.h.Gong Q.B.Gou M.h.Gu j.G.Guo x.l.Guo Y.Q.Guo Y.Y.Guo Y.A.han h.h.he h.N.he j.C.he S.l.he x.B.he Y.he M.heller Y.K.hor C.hou x.hou h.B.hu S.hu S.C.hu x.j.hu D.h.huang Q.l.huan W.h.huang x.T.huang Z.C.huang f.ji x.l.ji h.Y.jia K.jiang Z.j.jiang C.jin D.Kuleshov K.levochkin B.B.li C.li C.li f.li h.B.li h.C.li h.Y.li j.li K.li W.l.li x.li x.li x.R.li Y.li Y.Z.li Z.li Z.li E.W.liang Y.f.liang S.j.lin B.liu C.liu D.liu h.liu h.D.liu j.liu j.l.liu j.S.liu j.Y.liu M.Y.liu R.Y.liu S.M.liu W.liu Y.N.liu Z.x.liu W.j.long R.lu h.K.lv B.Q.Ma l.l.Ma x.h.Ma j.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.C.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Sáiz l.Shao O.Shchegolev x.D.Shen j.R.Shi h.C.Song Yu.V.Stenkin V.Stepanov Q.N.sun x.N.sun Z.B.sun P.h.T.Tam Z.B.Tang W.W.Tian B.D.Wan C.Wang h.Wang h.G.Wang j.C.Wang j.S.Wang l.P.Wang l.Y.Wan R.N.Wang W.Wang W.Wang x.G.Wang x.j.Wan x.Y.Wang Y.D.Wan Y.j.Wan Y.P.Wang Z.Wang Z.Wang Z.h.Wang Z.x.Wang D.M.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu h.R.Wu S.Wu W.x.Wu x.f.Wu S.Q.xi j.xia j.j.xia G.M.xiang G.xiao h.B.xiao G.G.xin Y.l.xin Y.xing D.l.xu R.x.xu l.xue D.h.Yan C.W.Yang f.f.Yang j.Y.Yang l.l.Yang M.j.Yan R.Z.Yang S.B.Yang Y.h.Yao Z.G.Yao Y.M.Ye l.Q.Yin N.Yin x.h.You Z.Y.You Y.h.Yu Q.Yuan h.D.Zeng T.x.Zeng W.Zeng Z.K.Zeng M.Zha x.x.Zhai B.B.Zhang h.M.Zhang h.Y.Zhang j.l.Zhang j.W.Zhang l.Zhang l.Zhang l.x.Zhang P.f.Zhang P.P.Zhang R.Zhang S.R.Zhang S.S.Zhan x.Zhang x.P.Zhan Y.Zhan Y.Zhang Y.f.Zhang Y.l.Zhan B.zhao j.zhao l.zhao l.Z.zhao S.P.zhao f.Zheng Y.Zheng B.Zhou h.Zhou j.N.Zhou P.Zhou R.Zhou x.x.Zhou C.G. Key laboratory of Particle Astrophysics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of Sciences Beijing 100049China TIANfu Cosmic Ray Research Center ChengduSichuanChina State Key laboratory of Particle Detection and Electronics BeijingChina university of Science and Technology of china Hefei 230026AnhuiChina Department of Engineering Physics Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China National Space Science Center Chinese Academy of SciencesBeijing 100190China School of Physics Peking UniversityBeijing 100871China Center for Astrophysics Guangzhou UniversityGuangzhou 510006GuangdongChina School of Physics and Astronomy&School of Physics(Guangzhou) Sun Yat-sen UniversityZhuhai 519000GuangdongChina School of Physical Science and Technology Guangxi UniversityNanning 530004GuangxiChina hebei Normal university Shijiazhuang 050024HebeiChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001HenanChina School of Astronomy and Space Science Nanjing UniversityNanjing 210023JiangsuChina Key laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023JiangsuChina Institute of frontier and Interdisciplinary Science Shandong UniversityQingdao 266237ShandongChina Key laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031SichuanChina College of Physics Sichuan UniversityChengdu 610065SichuanChina Key laboratory of Cosmic Rays(Tibet university) Ministry of EducationLhasa 850000TibetChina School of Physic

Purpose Observation of high energy and very high emission from Gamma Ray Bursts(GRBs)is crucial to study the gigantic explosion and the underline *** a large field-of-view and almost full duty cycle,the Water Cherenkov Detector Array(WCDA),a sub-array of the large high Altitude Air Shower Observatory(lhAASO),is appropriate to monitor the very high energy emission from unpredictable transients such as *** Nevertheless,the main issue for an extensive air shower array is the high energy threshold which limits the horizon of the *** address this issue a new trigger method is developed in this article to lower the energy threshold of WCDA for GRB *** The proposed method significantly improves the detection efficiency of WCDA for gamma-rays around the GRB direction at 10-300 *** sensitivity of the WCDA for GRB detection with the new trigger method is *** achieved sensitivity of the quarter WCDA array above 10 GeV is comparable with that of *** data analysis process and corresponding fluence upper limit for GRB 190719C is presented as an example.

关键词： lhAASO WCDA GRB

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A dynamic range extension system for lhAASOWCDA-1

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Radiation Detection Technology and Methods 2021年第4期5卷 520-530页

作者： f.Aharonian Q.An Axikegu l.x.Bai Y.x.Bai Y.W.Bao D.Bastieri x.j.Bi Y.j.Bi h.Cai j.T.Cai Z.Cao Z.Cao j.Chang j.f.Chang x.C.Chang B.M.Chen j.Chen l.Chen l.Chen l.Chen M.j.Chen M.l.Chen Q.h.Chen S.h.Chen S.Z.Chen T.l.Chen x.l.Chen Y.Chen N.Cheng Y.D.Cheng S.W.Cui x.h.Cui Y.D.Cui B.Z.Dai h.l.Dai Z.G.Dai Danzengluobu D.della Volpe B.D’Ettorre Piazzoli x.j.Dong j.h.fan Y.Z.fan Z.x.fan j.fang K.fang C.f.feng l.feng S.h.feng Y.l.feng B.Gao C.D.Gao Q.Gao W.Gao M.M.Ge l.S.Geng G.h.Gong Q.B.Gou M.h.Gu j.G.Guo x.l.Guo Y.Q.Guo Y.Y.Guo Y.A.han h.h.he h.N.he j.C.he S.l.he x.B.he Y.he M.heller Y.K.hor C.hou x.hou h.B.hu S.hu S.C.hu x.j.hu D.h.huang Q.l.huang W.h.huang x.T.huang Y.huang Z.C.huang f.ji x.l.ji h.Y.jia K.jiang Z.j.jiang C.jin D.Kuleshov K.levochkin B.B.li C.li C.li f.li h.B.li h.C.li h.Y.li j.li K.li W.l.li x.li x.li x.R.li Y.li Y.Z.li Z.li Z.li E.W.liang Y.f.liang S.j.lin B.liu C.liu D.liu h.liu h.D.liu j.liu j.l.liu j.S.liu j.Y.liu M.Y.liu R.Y.liu S.M.liu W.liu Y.N.liu Z.x.liu W.j.long R.lu h.K.lv B.Q.Ma l.l.Ma x.h.Ma j.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.C.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Sáiz l.Shao O.Shchegolev x.D.Sheng j.R.Shi h.C.Song Yu.V.Stenkin V.Stepanov Q.N.sun x.N.sun Z.B.sun P.h.T.Tam Z.B.Tang W.W.Tian B.D.Wang C.Wang h.Wang h.G.Wang j.C.Wang j.S.Wang l.P.Wang l.Y.Wang R.N.Wang W.Wang W.Wang x.G.Wang x.j.Wang x.Y.Wang Y.D.Wang Y.j.Wang Y.P.Wang Z.Wang Z.Wang Z.h.Wang Z.x.Wang D.M.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu h.R.Wu S.Wu W.x.Wu x.f.Wu S.Q.xi j.xia j.j.xia G.M.xiang G.xiao h.B.xiao G.G.xin Y.l.xin Y.xing D.l.xu R.x.xu l.xue D.h.Yan C.W.Yang f.f.Yang j.Y.Yang l.l.Yang M.j.Yang R.Z.Yang S.B.Yang Y.h.Yao Z.G.Yao Y.M.Ye l.Q.Yin N.Yin x.h.You Z.Y.You Y.h.Yu Q.Yuan h.D.Zeng T.x.Zeng W.Zeng Z.K.Zeng M.Zha x.x.Zhai B.B.Zhang h.M.Zhang h.Y.Zhang j.l.Zhang j.W.Zhang l.Zhang l.Zhang l.x.Zhang P.f.Zhang P.P.Zhang R.Zhang S.R.Zhang S.S.Zhang x.Zhang x.P.Zhang Y.Zhang Y.Zhang Y.f.Zhang Y.l.Zhang B.zhao j.zhao l.zhao l.Z.zhao S.P.zhao f.Zheng Y.Zheng B.Zhou h.Zhou j.N.Zhou Key laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of Sciences Beijing 100049China TIANfu Cosmic Ray Research Center ChengduSichuanChina State Key laboratory of Particle Detection and Electronics BeijingChina university of Science and Technology of china Hefei 230026AnhuiChina Department of Engineering Physics Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China National Space Science Center Chinese Academy of SciencesBeijing 100190China School of Physics Peking UniversityBeijing 100871China Center for Astrophysics Guangzhou UniversityGuangzhou 510006GuangdongChina School of Physics and Astronomy&School of Physics(Guangzhou) Sun Yat-sen UniversityZhuhai 519000GuangdongChina School of Physical Science and Technology Guangxi UniversityNanning 530004GuangxiChina hebei Normal university Shijiazhuang 050024HebeiChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001HenanChina School of Astronomy and Space Science Nanjing UniversityNanjing 210023JiangsuChina Key laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023JiangsuChina Institute of frontier and Interdisciplinary Science Shandong UniversityQingdao 266237ShandongChina Key laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031SichuanChina College of Physics Sichuan UniversityChengdu 610065SichuanChina Key laboratory of Cosmic Rays(Tibet university) Ministry of EducationLhasa 850000TibetChina School of Physics

Purpose The main scientific goal of lhAASO-WCDA is to survey gamma-ray sources with energy from 100 GeV to 30 *** observe high-energy shower events,especially to measure the energy spectrum of cosmic rays from 100 TeV to 10 PeV,a dynamic range extension system(WCDA++)is designed to use a 1.5-inch PMT with a dynamic range of four orders of magnitude for each cell in *** The dynamic range is extended by using these PMTs to measure the effective charge density in the core region of air shower events,which is an important parameter for identifying the composition of primary *** and Conclusion The system has been running for more than one *** this paper,the details of the design and performance of WCDA++are presented.

关键词： lhAASO-WCDA WCDA++ Water Cherenkov detector Performance

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Effects of SiC Nanoparticle Content on the Microstructure and Tensile Mechanical Properties of Ultrafine Grained AA6063-SiC_(np) Nanocomposites fabricated by Powder Metallurgy

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journal of Materials Science & Technology 2017年第9期33卷 1023-1030页

作者： x.Yao Z.Zhang Y.f.Zheng C.Kong M.Z.Quadir j.M.liang Y.h.Chen P.Munroe D.l.Zhang State Key laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University Electron Microscope Unit University of New South Wales School of Materials Science and Engineering University of New South Wales

Ultrafine grained AA6063-SiCnpnanocomposites with 1, 5 and 10 vol.% SiCnphave been fabricated by a novel powder metallurgy process. This process combines high energy ball milling of a mixture of 6063 alloy granules made from machining chips and Si C nanoparticles and thermomechanical powder consolidation by spark plasma sintering and hot extrusion. The microstructure and tensile mechanical properties of the samples were investigated in detail. Increasing the Si C nanoparticle content from 1 to 10 vol.%,the yield strength and ultimate tensile strength increased from 296 and 343 MPa to 545 and 603 MPa respectively, and the elongation to fracture decreased from 10.0%, to 2.3%. As expected, a higher Si C nanoparticle content generates a stronger inhibiting effect to grain growth during the thermomechanical powder consolidation process. Analysis of the contributions of various strengthening mechanisms shows that a higher Si C nanoparticle content leads to a higher contribution from nanoparticle strengthening, but grain boundary strengthening still makes the largest contribution to the strength of the *** the Si C nanoparticle content increased to 10 vol.%, the failure of the nanocomposite was initiated at weakly-bonded interparticle boundaries(IPBs), indicating that with a high flow stress during tensile deformation, the failure of the material is more sensitive to the presence of weakly-bonded IPBs.

关键词： Metal matrix nanocomposite Ultrafine grained material Powder metallurgy Tensile mechanical properties

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Performance of lhAASO-WCDA and observation of the Crab Nebula as a standard candle

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Chinese Physics C 2021年第8期45卷 166-181页

作者： f.Aharonian Q.An Axikegu l.x.Bai Y.x.Bai Y.W.Bao D.Bastieri x.j.Bi Y.j.Bi h.Cai j.T.Cai Z.Cao Z.Cao j.Chang j.f.Chang x.C.Chang B.M.Chen j.Chen l.Chen l.Chen l.Chen M.j.Chen M.l.Chen Q.h.Chen S.h.Chen S.Z.Chen T.l.Chen x.l.Chen Y.Chen N.Cheng Y.D.Cheng S.W.Cui x.h.Cui Y.D.Cui B.Z.Dai h.l.Dai Z.G.Dai Danzengluobu D.della Volpe B.D'Ettorre Piazzoli x.j.Dong j.h.fan Y.Z.fan Z.x.fan j.fang K.fang C.f.feng l.feng S.h.feng Y.l.feng B.Gao C.D.Gao Q.Gao W.Gao M.M.Ge l.S.Geng G.h.Gong Q.B.Gou M.h.Gu j.G.Guo x.l.Guo Y.Q.Guo Y.Y.Guo Y.A.han h.h.he h.N.he j.C.he S.l.he x.B.he Y.he M.heller Y.K.hor C.hou x.hou h.B.hu S.hu S.C.hu x.j.hu D.h.huang Q.l.huang W.h.huang x.T.huang Z.C.huang f.ji x.l.ji h.Y.jia K.jiang Z.j.jiang C.jin D.Kuleshov K.levochkin B.B.li C.li C.li f.li h.B.li h.C.li h.Y.li j.li K.li W.l.li x.li x.li x.R.li Y.li Y.Z.li Z.li Z.li E.W.liang Y.f.liang S.j.lin B.liu C.liu D.liu h.liu h.D.liu j.liu j.l.liu j.S.liu j.Y.liu M.Y.liu R.Y.liu S.M.liu W.liu Y.N.liu Z.x.liu W.j.long R.lu h.K.lv B.Q.Ma l.l.Ma x.h.Ma j.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.C.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi B.Q.Qiao D.Ruffolo V.Rulev A.Saiz l.Shao O.Shchegolev x.D.Sheng j.R.Shi h.C.Song Yu.V.Stenkin V.Stepanov Q.N.sun x.N.sun Z.B.sun P.h.T.Tam Z.B.Tang W.W.Tian B.D.Wang C.Wang h.Wang h.G.Wang j.C.Wang j.S.Wang l.P.Wang l.Y.Wang R.N.Wang W.Wang W.Wang x.G.Wang x.j.Wang x.Y.Wang Y.D.Wang Y.j.Wang Y.P.Wang Z.Wang Z.Wang Z.h.Wang Z.x.Wang D.M.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu h.R.Wu S.Wu W.x.Wu x.f.Wu S.Q.xi j.xia j.j.xia G.M.xiang G.xiao h.B.xiao G.G.xin Y.l.xin Y.xing D.l.xu R.x.xu l.xue D.h.Yan C.W.Yang f.f.Yang j.Y.Yang l.l.Yang M.j.Yang R.Z.Yang S.B.Yang Y.h.Yao Z.G.Yao Y.M.Ye l.Q.Yin N.Yin x.h.You Z.Y.You Y.h.Yu Q.Yuan h.D.Zeng T.x.Zeng W.Zeng Z.K.Zeng M.Zha x.x.Zhai B.B.Zhang h.M.Zhang h.Y.Zhang j.l.Zhang j.W.Zhang l.Zhang l.Zhang l.x.Zhang P.f.Zhang P.P.Zhang R.Zhang S.R.Zhang S.S.Zhang x.Zhang x.P.Zhang Y.Zhang Y.Zhang Y.f.Zhang Y.l.Zhang B.zhao j.zhao l.zhao l.Z.zhao S.P.zhao f.Zheng Y.Zheng B.Zhou h.Zhou j.N.Zhou Key laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of Sciences Beijing 100049China TIANfu Cosmic Ray Research Center ChengduSichuanChina State Key laboratory of Particle Detection and Electronics China university of Science and Technology of china Hefei 230026China Department of Engineering Physics Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China National Space Science Center Chinese Academy of SciencesBeijing 100190China School of Physics Peking UniversityBeijing 100871China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China School of Physics and Astronomy&School of Physics(Guangzhou) Sun Yat-sen UniversityZhuhai 519082China School of Physical Science and Technology Guangxi UniversityNanning 530004China hebei Normal university Shijiazhuang 050024China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Institute of frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Key laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China College of Physics Sichuan UniversityChengdu 610065China Key laboratory of Cosmic Rays(Tibet university) Ministry of EducationLhasa 850000China School of Physics and Technology Wuhan UniversityWuhan 430072China School of Physics and Astronomy Yunnan University

The first Water Cherenkov detector of the lhAASO experiment(WCDA-1)has been operating since April *** data for the first year have been analyzed to test its performance by observing the Crab Nebula as a standard *** WCDA-1 achieves a sensitivity of 65 mCU per year,with a statistical threshold of 5 *** accomplish this,a 97.7%cosmic-ray background rejection rate around 1 TeV and 99.8%around 6 TeV with an ap proximate photon acceptance of 50%is achieved after applying an algorithm to separate gamma-induced *** angular resolution is measured using the Crab Nebula as a point source to be approximately 0.45°at 1 TeV and better than 0.2°above 6 TeV,with a pointing accuracy better than 0.05°.These values all match the design *** energy resolution is found to be 33%for gamma rays around 6 *** spectral energy distribution of the Crab Nebula in the range from 500 GeV to 15.8 TeV is measured and found to be in agreement with the results from other TeV gamma ray observatories.

关键词： lhAASO-WCDA Crab Nebula angular resolution spectral energy distribution

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Production of Cloned Miniature Pigs by Enucleation using the Spindle View System

Production of Cloned Miniature Pigs by Enucleation using the...

引用

第九届中国实验动物科学年会（2010新疆）

作者： Ylil,3,4,jliul,4,j Dai2,f xing1,Z fang1,T Zhang2,Z Shi3,D Zhang2 and xChen1,4 1 Department of laboratory Animal Science,School of Medicine,shanghai jiao tong university,shanghai 2 Institute of Animal Sci and Veterinary Medicine,shanghai Municipal Key laboratory of Agri-Genetics and Breeding,shanghai 3College of Animal Science,South china Agricultural university,Guangzhou,Guangdong 4 Center of Developmental Biology,xinhua hospital,shanghai jiao tong university,shanghai,china

Objectivc Cloned animals in several species,including sheep(Schnieke et al.1997),cattle(Bordignon et al. 2003),mice(Wakayama et al.1998),goats(Baguisi et al.1999),cats(Shin et al.2002),horses(Galli et al.2003),dogs(lee et al.2005) and rabbits(li et al.2006c),have been successfully produced by somatic cell nuclear transfer(NT).Although several groups have conducted NT with pigs(Betthauser et al.2000;Onishi et al.2000;Polejaeva et al.2000;Boquest et al. 2002),the efficiency is extremely low,withf the transferred embryos surviving to term(Martinez et al.2003). Therefore,it is particularly important to improve the efficiency of cloning in *** recent years,Du et *** the blastocyst rate with the handmade cloning method to be 50-80%with ten piglets delivered(Du et al.2007).In the field of medicine,miniature pigs are the preferred animals for pulmonary drugs toxicity tests and metabolic *** is well known that many human diseases can be treated by organ allotransplantation,but the shortage of human organ sources presents a significant barrier for *** of organs from miniature pigs has been considered as a suitable option because it has many advantages,such as compatibility in terms of size and physiology and a potentially large supply(Cozzi et al.2000).Multiple factors render pig cloning *** regard to the technique,pig oocytes are difficult to enucleate because their cytoplasm contains many lipid *** ’blind’ enucleation method involves removal of the nucleus through the first polar body and the adjacent cytoplasm(Onishi et al.2000).Yet,the inner development environment of oocytes is cytoplasm and its main functions are metabolism and maintain structure of oocytes *** to the oocytes occurs by removal of most of the cytoplasm during the ’blind’ method and it cannot be clearly confirmed whether the karyon in the oocytes has been ***,some investigators have used the centrifugal

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