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PT Symmetry Induced Rings of Lasing Threshold Modes Embedded with Discrete Bound States in the Continuum

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Chinese Physics Letters 2021年第8期38卷 50-56页

作者： qianju Song Shiwei Dai Dezhuan Han z.q.zhang C.T.Chan Jian zi College of Physics Chongqing UniversityChongqing 401331China Department of Physics Hong Kong University of Science and TechnologyClear Water BayHong KongChina Department of Physics Key Laboratory of Micro-and Nano-Photonic Structures(MOE)and State Key Laboratory of Surface PhysicsFudan UniversityShanghai 200433China

It is well known that spatial symmetry in a photonic crystal(PhC)slab is capable of creating bound states in the continuum(BICs),which can be characterized by topological charges of polarization ***,we show that when a PT-symmetric perturbation is introduced into the PhC slab,a new type of BICs(pt-BICs)will arise from each ordinary BIC together with the creation of rings of lasing threshold modes with pt-BICs embedded in these *** from ordinary BICs,the q-factor divergence rate of a pt-BIC is reduced and anisotropic in momentum ***,pt-BICs can even appear at off-high symmetry lines of the Brillouin *** pt-BICs also carry topological charges and can be created or annihilated with the total charge conserved.A unified picture on pt-BICs and the associated lasing threshold modes is given based on the temporal coupled mode *** findings reveal the new physics arising from the interplay between PT symmetry and BIC in PhC slabs.

关键词： polarization symmetry lasing

Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

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Journal of Materials Science & Technology 2023年第1期132卷 119-131页

作者： Y.Xing C.J.Li Y.K.Mu Y.D.Jia K.K.Song J.Tan G.Wang z.q.zhang J.H.Yi J.Eckert Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12Leoben A-8700Austria Adjunct with National University of Science and Technology«MISiS» Leninsky Prosp.4Moscow 119049Russia

Multiphase CrMnFeCoNi high-entropy alloys(HEAs)were prepared by a powder metallurgy process com-bining mechanical alloying(MA)and vacuum hot-pressing sintering(HPS).The single-phase face-centered cubic(FCC)HEA powder prepared by MA was sintered into a bulk HEA specimen containing FCC phase matrix along with precipitated M 23 C 6 phase and nanoscaleσphase *** the sintering temper-ature was 1223 K,the ultimate strength reaches 1300±11.6 MPa,and the elongation exceeds 4%±0.6%.Microstructural characterization reveals that the formation of nanoscale particles and deformation twins play critical roles in improving the strain hardening(SH)*** the MA time promoted the formation of the precipitated phase and enhanced the SH ability by increasing the number of precip-itated *** SH capacity increases significantly with increasing sintering temperature,which is attributed to a significant enhancement in the twinning capacity due to grain growth and the reduced number ofσphase *** systematic studies,the planar glide of dislocations was found to be the main mode of deformation,while deformation twinning appeared as an auxiliary deformation mode when the twinning stress was *** the formation of precipitates leads to grain bound-ary and precipitation strengthening effects,crack initiation is more prominent owing to increased grain boundary brittleness around the precipitated M 23 C 6 *** prominence of crack initiation is a contra-diction that must be reconciled with regard to precipitation *** work serves as a useful reference for the preparation of high-strength HEA parts by powder metallurgy.

关键词： High entropy alloy Powder processing Grain reﬁnement Precipitation strengthening Deformation twinning

MECHANICAL BEHAVIOR OF CARBON NANOTUBES ENCAPSULATING COPPER ATOMS

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MECHANICAL BEHAVIOR OF CARBON NANOTUBES ENCAPSULATING COPPER...

Ultra-high Ultra-short OPCPA Laser Development

中国计算力学大会2014暨第三届钱令希计算力学奖颁奖大会

作者： L.Wang z.q.zhang Y.G.zheng Department of Engineering Mechanics Hohai University Micro/Nano Science and Technology Center Jiangsu University State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

In nanoelectromechanical systems(NEMS),torsional devices can be used for a wide number of applications including sensors,signal processors,optical modulators,clocks for electronics,and resonators,*** to their excellent mechanical,electrical,and thermal properties,carbon nanotubes(CNTs)are expected to be the ideal candidate for use as torsional springs in

关键词： Carbon Nanotubes Metal Filling Torsion Molecular Dynamics

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Ultra-high Ultra-short OPCPA Laser Development

CCAST“2002年全国强场激光物理”研讨会

作者： X.D.Yang.z.z.Xu,R.X.LI,z.q.zhang,H.H.Lu, Y.X.Leng L.H.Lin, W.q.zhang, Y.Fan, B.Tang, B.z.zhao Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

＜正＞MotivationsDeveloping 16.7TW OPCPA laser systemThe Latest Research Result on OPCPAA practical design of a 100TW OPCPA scheme Conclusion

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全球定位系统数据所显示的华北平原现今形变

世界地震译丛 2020年第1期51卷 75-85页

作者： Y.G.zhang W.J.zheng Y.J.Wang D.L.zhang Y.T.Tian M.Wang z.q.zhang P.z.zhang 李莹甄(译) 颜梓幸(译) 赵爱华(校) 不详防灾科技学院中国地震局地球物理研究所

华北平原是一个地震危险性很高的地区,但先前的全球定位系统测量显示,华北平原现今几乎没有地壳形变。利用中国东部三个块体的最新全球定位系统数据,发现华北平原的地震间形变发生在一个近东西向、宽约1100km的左旋剪切带内。地震间的... 详细信息

华北平原是一个地震危险性很高的地区,但先前的全球定位系统测量显示,华北平原现今几乎没有地壳形变。利用中国东部三个块体的最新全球定位系统数据,发现华北平原的地震间形变发生在一个近东西向、宽约1100km的左旋剪切带内。地震间的左旋剪切形变为6.0±1.3mm/a,其造成的现今形变最终被沿北—北东向断层、右旋走滑的地震破裂和块体的逆时针旋转所调节。我们认为刚性华南块体相对于刚性阿穆里安块体向东的快速运动,产生了一对左旋剪切力偶,扭曲了非刚性的华北平原,形成了现今的地壳形变。

关键词：全球定位系统华北平原地壳形变显示地震危险性逆时针旋转非刚性中国东部

Future Physics Programme of BESⅢ

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Chinese Physics C 2020年第4期44卷 I0001-I0004,1-102页

作者： M.Ablikim M.N.Achasov P.Adlarson S.Ahmed M.Albrecht M.Alekseev A.Amoroso F.F.An q.An Y.Bai O.Bakina R.Baldini Ferroli Y.Ban K.Begzsuren J.V.Bennett N.Berger M.Bertani D.Bettoni F.Bianchi J Biernat J.Bloms I.Boyko R.A.Briere L.Calibbi H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.Chai J.F.Chang W.L.Chang J.Charles G.Chelkov Chen G.Chen H.S.Chen J.C.Chen M.L.Chen S.J.Chen Y.B.Chen H.Y.Cheng W.Cheng G.Cibinetto F.Cossio X.F.Cui H.L.Dai J.P.Dai X.C.Dai A.Dbeyssi D.Dedovich z.Y.Deng A.Denig Denysenko M.Destefanis S.Descotes-Genon F.De Mori Y.Ding C.Dong J.Dong L.Y.Dong M.Y.Dong z.L.Dou S.X.Du S.I.Eidelman J.z.Fan J.Fang S.S.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng M.Fritsch C.D.Fu Y.Fu q.Gao X.L.Gao Y.Gao Y.Gao Y.G.Gao z.Gao B.Garillon I.Garzia 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 A.q.Guo F.K.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov S.Han X.q.Hao F.A.Harris K.L.He F.H.Heinsius T.Held Y.K.Heng Y.R.Hou z.L.Hou H.M.Hu J.F.Hu T.Hu Y.Hu G.S.Huang J.S.Huang X.T.Huang X.z.Huang z.L.Huang N.Huesken T.Hussain W.Ikegami Andersson W.Imoehl M.Irshad q.Ji q.P.Ji X.B.Ji X.L.Ji H.L.Jiang X.S.Jiang X.Y.Jiang J.B.Jiao z.Jiao D.P.Jin S.Jin Y.Jin T.Johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk T.Khan A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc M.Kurth M.G.Kurth W.Kuhn J.S.Lange P.Larin L.Lavezzi H.Leithoff T.Lenz C.Li Cheng Li D.M.Li F.Li F.Y.Li G.Li H.B.Li H.J.Li J.C.Li J.W.Li Ke Li L.K.Li Lei Li P.L.Li P.R.Li q.Y.Li W.D.Li W.G.Li X.H.Li X.L.Li X.N.Li X.q.Li z.B.Li H.Liang H.Liang Y.F.Liang Y.T.Liang G.R.Liao L.z.Liao J.Libby C.X.Lin D.X.Lin Y.J.Lin B.Liu B.J.Liu C.X.Liu D.Liu D.Y.Liu F.H.Liu Fang Liu Feng Liu H.B.Liu H.M.Liu Huanhuan Liu Huihui Liu J.B.Liu J.Y.Liu K.Y.Liu Ke Liu q.Liu S.B.Liu T.Liu X.Liu X.Y.Liu Y.B.Liu z.A.Liu zhiqing Liu Y.F.Long X.C.Lou H.J.Lu J.D.Lu J.G.Lu Y.Lu Y.P.Lu C.L.Luo M.X.Luo P.W.Luo T.Luo X.L.Luo S.Lusso X.R.Lyu F.C.Ma H.L.Ma L.L.Ma M.M.Ma q.M.Ma X.N.Ma X.X. 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 Johann-Joachim-Becher-Weg 45D-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 I-00044FrascatiItaly INFN Sezione di Ferrara I-44122FerraraItaly Institute of Physics and Technology Peace Ave.54BUlaanbaatar 13330Mongolia 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 16D-35392 GiessenGermany KVI-CART University of GroningenNL-9747 AA GroningenThe Netherlands Lanzhou University Lanzhou 730000China Liaoning University Shenyang 110036China Nanjing Normal University Nanjing 210023China Nanjing University Nanjing 210093China Nankai University Tianjin 300071China Peking University Beijing 100871China Shandong University Jinan 250100China Shanghai

There has recently been a dramatic renewal of interest in hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like XYz states at BESⅢ and B factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X(1835) meson state at BESⅢ, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESⅢ during the remaining operation period of BEPCⅡ. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCⅡ to higher luminosity.

关键词： meson hadron optimization

房颤病人双源前后门控冠状动脉CTA对比研究

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国际医学放射学杂志 2013年第5期 490-490页

作者： L.Xu L.Yang z.q.zhang Y.N.Wang z.Y.Jin L.J.zhang 高明 Department of Radiology Beijing Anzhen HospitalCapital Medical University

摘要目的探讨房颤(AF)病人前门控冠状动脉CTA(CCTA)的可行性并评估前后门控间影像质量和辐射剂量。方法 100例持续房颤病人,随机抽取50例病人行二代双源CT(DS-CT)前门控扫描,另50例行后门控扫描。2位阅片者基于冠状动脉节段对影像质量分... 详细信息

摘要目的探讨房颤(AF)病人前门控冠状动脉CTA(CCTA)的可行性并评估前后门控间影像质量和辐射剂量。方法 100例持续房颤病人,随机抽取50例病人行二代双源CT(DS-CT)前门控扫描,另50例行后门控扫描。2位阅片者基于冠状动脉节段对影像质量分成4个等级(1=优,2=良,3=中,4=差)。难诊断的冠状动脉节段为第4级。辐射量亦同时评估。结果前门控可诊断的冠状动脉节段为99.4%(642/646个),后门控为96.5%(604/626个)(P<0.001)。前、

关键词：冠状动脉影像质量节段房颤病人门控双源 CTA

A new model for the expansion tube considering the stress coupling:Theory,experiments and simulations

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Defence Technology（防务技术） 2022年第7期18卷 1190-1204页

作者： M.z.Wu X.W.zhang q.M.zhang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyHaidian DistrictBeijing10081China

Based on the two-arc profile assumption,the expansion deformation and energy absorption of circular tubes compressed by conical-cylindrical dies were ***,the deformation of the two arcs was analyzed independently and an improved model denoted as Model-I was ***,by further involving the coupling between the bending moment and membrane forces,a more elaborate model,i.e.,Model-II was ***,experiments and simulations were conducted to verify the models,which show that,compared with previous theoretical models,Model-II could not only capture the prominent features of the deformation,but also improve the prediction accuracy of the steady driving force *** means of this model,it was found that the critical semi-conical angle,which makes the driving force minimum,increases with the increase of the friction coefficient,expansion ratio as well as the radius/thickness ratio of the ***,the energy dissipation due to stretching is always greater than that of bending,while the friction dissipation can account for the largest proportion at small semi-conical angle or large friction *** a certain friction and die conditions,the specific energy absorption of expanded tubes can be much higher than that under progressive collapse mode.

关键词： Expansion Circular tube Stress coupling Strain hardening Energy absorption

Precipitation of multi-type nano-quasicrystals in a Mg-zn-Y alloy

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Journal of Magnesium and Alloys 2024年第3期12卷 997-1008页

作者： W.z.Wang X.z.zhou L.F.zhang H.q.Ye z.q.Yang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua Laboratory Foshan 528251China Foshan University Foshan 528231China

Mg-6zn-1Y(at.%)ribbons with strengthening precipitates of multi-type nanoquasicrystals were prepared by melt-spinning followed by aging *** evolution of the rapidly solidified ribbons during isothermal aging was comprehensively studied using various electron microscopy *** new kinds of decagonal quasicrystals were formed in aged ribbons,in addition to precipitation of nanometer icosahedral ***-resolution observations reveal that both decagonal quasicrystals can be modeled by quasiperiodic tiling with decagonal clusters of 2.5 nm in diameter,but overlap of neighboring clusters in both decagonal quasicrystals is different from the Gummelt model observed in other quasicrystals.A shell composed of complex Laves Mg-zn domains was formed surrounding each decagonal quasicrystal precipitate upon prolonged *** addition,all kinds of nanoprecipitates exhibit excellent structure and size stability at 573 *** findings may have implications for not only fundamental studies about quasicrystals,but also microstructural manipulation of high-performance Mg alloys.

关键词： quasicrystal Mg alloys Rapid solidification Scanning-transmission electron microscopy.