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Science Bulletin 2024年第4期69卷 449-457页

作者： LhAASO Collaboration Zhen Cao Chuandong Gao Cong li Ruo-yu liu Ruizhi yang 不详 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 ChengduChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China University of Science and Technology of China Hefei 230026China

We report the detection of aγ-ray bubble spanning at least 100deg2 in ultra-high energy(UhE)up to a few PeV in the direction of the star-forming region Cygnus X,implying the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola form with the photon indexΓ(E)=(2.71±0.02)+(0.11±0.02)×log10(E/10 TeV)is found fitting the gamma-ray energy spectrum of the bubble *** sources,“hot spots”correlated with very massive molecular clouds,and a quasi-spherical amorphousγ-ray emitter with a sharp central brightening are observed in the *** the core of~0.5°,spatially associating with a region containing massive OB association(Cygnus OB2)and a microquasar(Cygnus X-3),as well as previously reported multi-TeV sources,an enhanced concentration of UhEγ-rays is observed with 2 photons at energies above 1 *** general feature of the bubble,the morphology,and the energy spectrum,are reasonably reproduced by the assumption of a particle accelerator in the core,continuously injecting protons into the ambient medium.

关键词： Cosmic rays γ-rays Interstellar medium Star cluster

A numerical study on the influence of grain boundary oxides on dwell fatigue crack growth of a nickel-based superalloy

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Journal of Materials Science & Technology 2022年第9期104卷 224-235页

作者： C.Z.Fang h.C.Basoalto M.J.Anderson h.y.li S.J.Williams P.Bowen Department of Materials Science and Engineering University of SheffieldMappin StSheffield S13JDUK School of Metallurgy and Materials University of BirminghamEdgbastonBirmingham B152TTUK Institute of Structural Materials Swansea UniversitySwansea SA18ENUK

A theoretical treatment on the oxide-controlled dwell fatigue crack growth of aγ'strengthened nickelbased superalloys is *** particular,this study investigates the influence of an externally applied load and variations in theγ'dispersion on the grain boundary oxide growth kinetics.A dislocation-based viscoplastic constitutive description for high temperature deformation is used to simulate the stress state evolution in the vicinity of a crack at elevated *** viscoplastic model explicitly accounts for multimodalγ'particle size distributions.A multicomponent mass transport formulation is used to simulate the formation/evolution of an oxide wedge ahead of the crack tip,where stress-assisted vacancy diffusion is assumed to *** resulting set of constitutive and mass transport equations have been implemented within a finite element *** of predicted compositional fields across the matrix/oxide interface are compared with experiments and shown to be in good *** indicate that the presence of a fineγ'size distribution has a strong influence on the predicted ow stress of the material and consequently on the relaxation in the vicinity of the crack-tip/oxide *** is shown that a unimodal dispersion leads to reduced oxide growth rates(parabolic behavior)when compared to a bimodal *** conditions for oxide formation are investigated and is associated with the prediction of compressive stresses within the oxide layer just ahead of the crack tip,which become progressively negative as the oxide wedge ***,mechanical equilibrium requirements induce tensile stresses at the tip of the oxide wedge,where failure of the oxide is *** time taken to reach this critical stress for oxide failure has been calculated,from which dwell crack growth rates are computationally *** predicted rates are shown to be in good agreement with available experimental data.

关键词： Nickel based superalloy Dwell crack growth Gamma prime Creep Oxidation Dislocation-based modeling Multicomponent diffusion Finite element method

Optimization of performance of the KM2A full array using the Crab Nebula

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Chinese Physics C 2024年第6期48卷 169-178页

作者：曹臻 F.Aharonian 安琪阿西克古白云翔包逸炜 D.Bastieri 毕效军毕玉江蔡金庭曹晴曹文羽曹喆常进常劲帆陈尚明陈恩生陈亮陈林陈龙陈明君陈玛丽陈起辉陈素弘陈天禄陈阳程宁程耀东崔明阳崔树旺崔晓红崔昱东戴本忠代洪亮戴子高单增罗布 D.della Volpe 董绪强段凯凯樊军辉范一中方军方堃冯存峰封莉冯少辉丰晓婷冯有亮 S.Gabici 高博高川东高林青高启高卫高伟康葛茂茂耿利斯 G.Giacinti 龚光华苟全补顾旻皓郭福来郭晓磊郭义庆郭莹莹韩毅昂何会海贺昊宁何佳银何新波何钰 M.heller 贺远强侯博文侯超侯贤胡红波胡铨胡世聪黄代绘黄天奇黄文俊黄性涛黄晓渊黄勇黄志成季筱璐贾焕玉贾康江琨姜晓巍姜泽军金敏康明铭柯通 D.Kuleshov.K.Kurinov 李兵兵李澄李骢李丹李飞李海波李会财李华阳李军李剑李捷李凯李文龙李文莲李秀荣李昕李一卓李哲黎卓梁恩维梁云峰林苏杰刘冰刘成刘栋刘虎刘海东刘佳刘江来刘金艳刘茂元柳若愚刘四明刘伟刘怡刘以农鲁睿罗晴吕洪魁马伯强马玲玲马欣华毛基荣闵振 W.Mitthumsiri 穆慧君南云程 A.Neronov 区子维庞彬宇 P.Pattarakijwanich 裴致远齐孟尧祁业情乔冰强秦家军 D.Ruffolo A.Sáiz D.Semikoz 邵澄宇邵琅 O.Shchegolev 盛祥东舒富文宋慧超 yu.V.Stenkin V.Stepanov 苏扬孙秦宁孙晓娜孙志斌谭柏轩唐庆文唐泽波田文武王超王昌贝王广威王洪光王惠惠王建成汪凯王利苹王玲玉王培汉王冉王为王祥高王祥玉王阳王玉东王岩谨王忠海王仲翔王振王铮韦大明魏俊杰魏永健文韬吴超勇吴含荣武莎吴雪峰吴雨生席邵强夏捷夏君集项光漫肖迪泫肖刚辛广广辛玉良邢祎熊峥徐东莲徐仁峰徐仁新徐伟立薛良闫大海颜景志颜田杨朝文杨帆杨冯帆杨何文杨佳盈杨莉莉杨明洁杨睿智杨深邦姚玉华姚志国叶一锰尹丽巧尹娜游晓浩游智勇于艳红袁强岳华曾厚敦曾婷轩曾玮查敏张彬彬张丰张海明张恒英张建立张丽霞张力张鹏飞张佩佩张瑞张少博张少如张寿山张潇张笑鹏张云峰张毅张勇赵兵赵静赵雷赵立志赵世平郑福周斌周浩周佳能周猛周平周荣周勋秀祝成光祝凤荣朱辉朱科军左雄 LhAASO Collaboration 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 Chengdu 610000China Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear Physics P.O.Box 10398069029 HeidelbergGermany State Key Laboratory of Particle Detection and Electronics China University of Science and Technology of China Hefei 230026China School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China hebei Normal University Shijiazhuang 050024China Key Laboratory of Dark Matter and Space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000TibetChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Physics and Astronomy(Zhuhai)&School of Physics(Guangzhou)&Sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275China School of Physics and Astronomy Yunnan UniversityKunming 650091China Département de Physique Nucléaire et Corpusculaire Facultéde SciencesUniversitéde Genève24 Quai Ernest Ansermet1211 GenevaSwitzerland Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APC Universit'e Paris Cit'eCNRS/IN2P3CEA/IRFUObservat

The full array of the Large high Altitude Air Shower Observatory(LhAASO)has been in operation since July *** its kilometer-square array(KM2A),we optimized the selection criteria for very high and ultrahigh energyγ-rays using data collected from August 2021 to August 2022,resulting in an improvement in significance of the detection in the Crab Nebula of approximately 15%,compared with that of previous *** the implementation of these new selection criteria,the angular resolution was also significantly improved by approximately 10%at tens of *** aspects of the full KM2A array performance,such as the pointing error,were also calibrated using the Crab *** resulting energy spectrum of the Crab Nebula in the energy range of 10-1000 TeV are well fitted by a log-parabola model,which is consistent with the previous results from LhAASO and other experiments.

关键词： γ-ray Crab Nebula significance

Colletotrichum species associated with cultivated citrus in China

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Fungal Diversity 2013年第4期61卷 61-74页

作者： F.huang G.Q.Chen X.hou y.S.Fu L.Cai K.D.hyde h.y.li Institute of Biotechnology Zhejiang UniversityHangzhou 310058China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Institute of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand

There have been considerable advances in the understanding of species concepts in the genus *** has lead to the need to carry out fresh surveys of Colletotrichum species associated with important *** species are associated with Citrus plants as saprobes,important pre-harvest and post-harvest pathogens,as well as *** this study,a total of 312 Colletotrichum strains were isolated from leaves,shoots and fruits of cultivated Citrus and Fortunella species with or without disease symptoms across the main citrus production areas in *** morphology of all strains were studied and multilocus(ACT,TUB2,CAL,GAPDh,GS,ITS)phylogeny *** were from four important species complexes of Colletotrichum,namely *** species complex,*** species complex,*** species complex and a final group including ***,which was rare on Citrus *** species belonging to the *** species complex comprised *** porioides and ***,the *** complex comprised *** and a new species *** and the *** complex included a new species,*** ability of strains to cause anthracnose on citrus fruits was tested by inoculation and strains of Colletotrichum gloeosporioides,*** and *** were pathogenic.

关键词： Citrus industry Citrus diseases Anthracnose Colletotrichum gloeosporioides Colletotrichum acutatum Colletotrichum boninense Morphology Phylogenetic analysis

Photonic elementary cellular automata for simulation of complex phenomena

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light(Science & Applications) 2023年第7期12卷 1309-1317页

作者： Gordon h.y.li Christian R.Leefmans James Williams Alireza Marandi Department of Applied Physics California Institute of TechnologyPasadenaCA91125USA Department of Electrical Engineering California Institute of TechnologyPasadenaCA91125USA

Cellular automata are a class of computational models based on simple rules and algorithms that can simulate a wide range of complex ***,when using conventional computers,these'simple'rules are only encapsulated at the level of *** can be taken one step further by simplifying the underlying physical ***,we propose and implement a simple photonic hardware platform for simulating complex phenomena based on cellular *** this special-purpose computer,we experimentally demonstrate complex phenomena,including fractals,chaos,and solitons,which are typically associated with much more complex physical *** flexibility and programmability of our photonic computer present new opportunities to simulate and harness complexity for effcient,robust,and decentralized information processing using light.

关键词： hardware computer automata

Prediction and experimental validation of osteoporosis susceptibility genes by computational disease gene identification strategy

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Prediction and experimental validation of osteoporosis susce...

Synthesis of morphology-controlled silver nanostructures by electrodeposition

International Conference on Osteoporosis and Bone Research 2008

作者： li Gloria h.y.li Annie W.C.Kung Department of Medicine The University of Hong KongHong KongChina

＜正＞Objective:To identify osteoporosis susceptibility genes by com- putational disease gene identification strategy. Methods:First,we used five freely available bioinformatics tools (Prioritizer,GeneSeeker,PROSPECTR...

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Nano-Micro Letters 2010年第1期2卷 6-10页

作者： C.L.liang K.Zhong M.liu L.Jiang S.K.liu D.D.Xing h.y.li y.Na W.X.Zhao y.X.Tong P.liu Instrumental Analysis & Research Center Sun Yat-sen University School of Chemistry and Chemical Engineering Sun Yat-sen University

Nanostructured silver was obtained by potentiostatic *** effects of ionized surfactant(sodium dodecanesulphonate)and the substrate(Cu and Ti)on the morphology of depositions were *** is found that morphologies of silver nanostructures can be simply controlled via change of the *** Ag nanoparticles with narrow size distribution were obtained by electrodeposition in Ag NO3-SDS aqueous solution on copper *** the case of titanium substrate,silver dendrite structures were *** of different morphologies,XRD and TEM results showed that the as-prepared samples belong to face-centered cubic silver structure with good *** formation mechanism of different silver nanostructures was discussed.

关键词： Electrodeposition Silver nanopartilces Silver nano dentrites

Identification of osteoporosis susceptibility genes in hong Kong Chinese

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Identification of osteoporosis susceptibility genes in Hong ...

Selection of Mixed Refrigerant for CBM liquefaction System and its Optimization Analysis

International Conference on Osteoporosis and Bone Research 2008

作者： Gloria h.y.li Chinglung Cheung Annie W.C.Kung Department of Medicine The University of Hong KongHang KongChina

＜正＞Objective:To identify osteoporosis susceptibility genes in hong Kong Chinese. Methods:A total of 104 microsatellite markers in genomic regions previously identified in genome wide linkage scans were selected and...

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Selection of Mixed Refrigerant for CBM Liquefaction System a...