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Chinese Physics Letters 1998年第1期15卷 32-34页

作者： MING Hai QIAN Jiang-yuan XIE Jian-ping a.b.fedotov X.Xiao M.M.T.Loy Department of Physics University of Science and Technology of ChinaHefei 230026 Department of Physics Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongChina

Shearing interferometry of an ion-etched holographic double-frequency grating is used to measure the optical coherence of femtosecond pulsed *** experimental results show that the optical coherence of the femtosecond light beam is not only related to the spectral width and size of the light source but is also related to the pulse duration and mode-locked laser *** results of theoretical analysis and numerical calculation are also *** of this research is also discussed.

关键词： Femto holographic interferometry

Fractionation and fixation of rare earth elements in soils:Effect of spiking with lanthanum,cerium,and neodymium chlorides

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Journal of Rare Earths 2022年第1期40卷 143-152页

作者： Olga b.Rogova Petr S.fedotov Rustam Kh.Dzhenloda Vasily K.Karandashev V.V.Dokuchaev Soil Science Institute Russian Academy of Sciences7 Building 2 Pyzhevskiy Side StreetMoscow119017Russia V.I.Vernadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of Sciences19 Kosygin StreetMoscow119991 Russia National University of Science and Technology'MISiS' 4 Leninsky ProspectMoscow119049Russia The Institute of Microelectronics Technology and High-Purity Materials Russian Academy of Sciences6 Institution StreetChernogolovka142432Russia

Industrial and agricultural activities lead to the release of rare earth elements(REEs)in wastewater and aquatic ecosystems,and their accumulation in ***,the behavior of REEs in soils remains somewhat *** the present work the fractionation and fixation of REEs in soddy-podzolic and chernozem soils spiked with La,Ce,and Nd chlorides were studied using dynamic(continuous flow)extraction,which allows natural conditions to be mimicked and artefacts to be *** eluents applied are aimed to dissolve exchangeable,specifically sorbed,bound to Mn oxides,bound to metal-organic complexes,and bound to amorphous and poorly ordered Fe/Al oxides fractions extractable by 0.05 mol/L Ca(NO_(3))2,0.43 mol/L CH_(3)COOH,0.1 mol/L NH_(2)OH·HCl,0.1 mol/L K_(4)P_(2)O_(7) at pH 11,and 0.1 mol/L(NH4)_(2)C_(2)O_(4) at pH 3.2,*** is found that the fixations of added La,Ce,and Nd in the form of metal-organic complexes is predominant for both types of soils:35%-38%in soddy-podzolic soil and 50%-79%in *** fixation of added elements in the first three fractions(exchangeable,specifically sorbed,and bound to Mn oxides)is significant for soddy-podzolic soil(5%-25%).For chernozem,the relative contents of added Ce and Nd in these fractions are nearly *** the content of exchangeable La is notable,about 5%.Adding any of three elements(La,Ce,or Nd)at the level of100 mg/kg to an initial sample results in changing the fractionation and bioaccessibility of other REEs present in *** contents increase in the first three fractions and decrease in fifth(oxalate extractable)fraction for both soddy-podzolic soil and *** main difference is the behavior of REEs in pyrophosphate extractable *** soddy-podzolic soil,adding La,Ce,or Nd results in decreasing the contents of other REEs associated with organic *** chernozem,on the contrary,the contents of REEs in the form of metal-organic complexes slightly *** processes

关键词： Rare earth elements Soddy-podzolic soil Chernozem Fractionation Competitive binding

Analytical solution of axisymmetric contact problem about indentation of a circular indenter into a soft functionally graded elastic layer

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Acta Mechanica Sinica 2013年第2期29卷 196-201页

作者： Sergey Volkov Sergey Aizikovich Yue-Sheng Wang Igor fedotov Research and Education Center "Materials" Don State Technical University South Federal University Research Institute of Mechanics and Applied Mathematics Institute of Engineering Mechanics Beijing Jiaotong University Department of Mathematical Technology Tshwane University of Technology

The paper addresses a contact problem of the theory of elasticity,i.e.,the penetration of a circular indenter with a flat base into a soft functionally graded elastic *** elastic properties of a functionally graded layer arbitrarily vary with depth,and the foundation is assumed to be elastic,yet much harder than a *** analytical solution is constructed,and it is shown that the solutions are asymptotically exact both for large and small values of characteristic dimensionless geometrical parameter of the *** examples are analyzed for the cases of monotonic and nonmonotonic variations of elastic *** results for the case of homogeneous layer are compared with the results for nondeformable foundation.

关键词： Contact problems·Indentation·Functionally graded layer

Recent results on nucleon resonance electrocouplings from the studies of π^+π^-p electroproduction with the CLAS detector

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Chinese Physics C 2009年第12期33卷 1210-1215页

作者： V. I. Mokeev V. D. burkert L. Elouadrhiri G. V. fedotov E. N. Golovach b. S. Ishkhanov Jefferson Lab Newport News 12000 Jefferson Ave VA 23606 USA Skobeltsyn Nuclear Physics Institute at Moscow State University Moscow 119899 Russia Physics Department at Moscow State University Moscow 119899 Russia

Recent results on nucleon resonance studies in π＋π-p electro- production off protons with the CLAS detector are presented. The analysis of CLAS data allowed us to determine all essential contributiag mechanisms, providing a credible separation between resonant and non-resonant parts of the cross sections in a wide kinematical area of invariant masses of the final hadronic system 1.3 〈 W 〈 1.8 GeV and photon virtutualities 0.2 〈 Q2 〈 1.5 GeV2. Electrocouplings of several excited proton states with masses less than 1.8 GeV were obtained for the first time from the analysis of π＋π-p exclusive electroproduction channel.

关键词： nucleon resonances electromagnetic form factors nucleon structure

Collective coherent emission of electrons in strong laser fields and perspective for hard x-ray lasers

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Matter and Radiation at Extremes 2024年第2期9卷 1-3页

作者： E.G.Gelfer A.M.fedotov O.Klimo S.Weber Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 Dolní BřežanyCzech Republic HiLASE Centre Institute of Physics of the Czech Academy of Sciences25241 Dolní BřežanyCzech Republic National Research Nuclear University MEPhI Moscow 115409Russia FNSPE Czech Technical University in Prague11519 PragueCzech Republic

Coherent motion of particles in a plasma can imprint itself on *** recent advent of high-power lasers—allowing the nonlinear inverse Compton-scattering regime to be reached—has opened the possibility of looking at collective effects in laser–plasma *** certain conditions,the collective interaction of many electrons with a laser pulse can generate coherent radiation in the hard x-ray *** perspective paper explains the limitations under which such a regime might be attained.

关键词： laser scattering coherent

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基于平面超材料的Fano谐振可调谐研究

物理学报 2012年第15期61卷 197-203页

作者：刘冉史金辉 E.Plum V.A. fedotov N.I. Zheludev E.Plum 哈尔滨工程大学理学院哈尔滨150001 Optoelectronics Research Center University of Southampton Southampton SO17 1B J UK 东南大学毫米波国家重点实验室南京210096

基于两段相同金属分裂环谐振器构成的单层结构,从理论及实验方面研究了平面超材料的可调谐Fano谐振.实验测量了平面超材料对TE和TM入射波的电磁响应,利用电磁波的入射角度控制Fano谐振的强度,实现了谐振的开关特性,谐振频率红移可达到2... 详细信息

基于两段相同金属分裂环谐振器构成的单层结构,从理论及实验方面研究了平面超材料的可调谐Fano谐振.实验测量了平面超材料对TE和TM入射波的电磁响应,利用电磁波的入射角度控制Fano谐振的强度,实现了谐振的开关特性,谐振频率红移可达到21%.基于有限元法给出了平面超材料的场分布,强的正常色散表明平面超材料的电磁响应可类比经典电磁诱导透明现象,仿真与实验结果相符合.对称结构超材料Fano谐振的开/关特性为超材料性能的可调谐控制提供了有效途径.

关键词：电磁超材料束缚模 Fano谐振电磁诱导透明

Free-surface velocity measurements of opaque materials in laser-driven shock-wave experiments using photonic Doppler velocimetry

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Matter and Radiation at Extremes 2021年第4期6卷 43-50页

作者： N.Nissim E.Greenberg M.Werdiger Y.Horowitz L.bakshi Y.Ferber b.Glam A.fedotov-Gefen L.Perelmutter S.Eliezer Applied Physics Division Soreq NRCYavneIsrael Note:This paper is part of the Special Issue on Matter in Extreme States Created by Laser.

We present a novel photonic Doppler velocimetry(PDV)design for laser-driven shock-wave *** PDV design is intended to provide the capability of measuring the free-surface velocity of shocked opaque materials in the terapascal *** present measurements of the free-surface velocity of gold for as long as∼2 ns from the shock breakout,at pressures of up to∼7 Mbar and a free-surface velocity of 7.3 km/s with an error of∼1.5%.Such laboratory pressure conditions are achieved predominantly at high-intensity laser facilities where the only velocity diagnostic is usually line-imaging velocity interferometry for any ***,that diagnostic is limited by the lower dynamic range of the streak camera(at a temporal resolution relevant to laser shock experiments)to measure the free-surface velocity of opaque materials up to pressures of only∼1 *** expect the proposed PDV design to allow the free-surface velocity of opaque materials to be measured at much higher pressures.

关键词： shock wave interferometry

basic Spectroscopy Performance of Nd3+ and Rhodamine b Doped Polymer Fibers

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Chinese Journal of Lasers 1999年第5期8卷 3-5页

作者： H. Ming Z. C. Liang K. Liu Q. Zhang(Department of Physics, Department of Materials Science and EngineeringUniversity of Science and Technology of China, Hefei 230026, China)A. b. fedotov X. D. Xiao M. M. T. Loy(Department of Physics, Hong Kong Univer 中国科学技术大学物理系安徽合肥 230026 中国科学技术大学物理系安徽合肥中国科学技术大学材料科学与工程系安徽合肥香港科技大学物理系香港

The spectroscopy properties of Nd3+ doped polymer fiber with 532 nm pumping radiation is studied. It is found that the emission peak near 380 nm is attributed the transition from 2 G7/2 and4 G5/5/2 to ground level 4I9/2, and the florescence intensity of Nd3+ doped polymer fiber with 70 ppm concentration and 650 μm cord diameter increases as the fiber is shortened from 89 cm to 15cm and decreases again for further shortening to 8cm. both the advantages and disadvantages of Nd3+ doped polymer fiber compared with Rhodamine b doped polymerfiber are discussed.

关键词： polymer fiber speetroscopy Nd3+ doped Rhodumine b doped

Upconversion in Highly Doped Er3+-Yb 3+ Fiber Pumped by Ti∶Sapphire Laser at 800 nm

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Chinese Journal of Lasers 2000年第1期 2-8页

作者： XU Lixing MING Hai XIONG Yang ZHU bing (Structure Research Laboralory, Department of Physics, University of Science and Technology of China, Hefei 230026, China)A. b. fedotov M. M. T. Loy X. Xiao (Department of Physics, Hong Kong University of Sc

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关键词： frequency up conversion Er 3+ Yb 3+ doped fiber Ti∶Sapphire laser

Performance and calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad b. Abbott K. Abeling N.J. Abicht S.H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti b.S. Acharya C. Adam bourdarios L. Adamczyk S.V. Addepalli M.J. Addison J. Adelman A. Adiguzel T. Adye A.A. Affolder Y. Afik M.N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad F. Ahmadov W.S. Ahmed S. Ahuja X. Ai G. Aielli A. Aikot M. Ait Tamlihat b. Aitbenchikh I. Aizenberg M. Akbiyik T.P.A. Åkesson A.V. Akimov D. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi J. Albert P. Albicocco G.L. Albouy S. Alderweireldt M. Aleksa I.N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi M. Algren M. Alhroob b. Ali H.M.J. Ali S. Ali S.W. Alibocus M. Aliev G. Alimonti W. Alkakhi C. Allaire b.M.M. Allbrooke J.F. Allen C.A. Allendes Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani M. Alvarez Estevez A. Alvarez Fernandez M. Alves Cardoso M.G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C.G. Ames D. Amidei S.P. Amor Dos Santos K.R. Amos V. Ananiev C. Anastopoulos T. Andeen J.K. Anders S.Y. Andrean A. Andreazza S. Angelidakis A. Angerami A.V. Anisenkov A. Annovi C. Antel M.T. Anthony E. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki J.A. Aparisi Pozo M.A. Aparo L. Aperio bella C. Appelt A. Apyan N. Aranzabal S.J. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai S. Asai N.A. Asbah J. Assahsah K. Assamagan R. Astalos S. Atashi R.J. Atkin M. Atkinson H. Atmani P.A. Atmasiddha K. Augsten S. Auricchio A.D. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos D. babal H. bachacou K. bachas A. bachiu F. backman A. badea P. bagnaia M. bahmani A.J. bailey V.R. bailey J.T. baines L. baines O.K. baker E. bakos D. bakshi Gupta V. balakrishnan R. balasubramanian E.M. baldin P. balek E. ballabene F. balli L.M. baltes W.K. balunas J. balz E. banas M. bandieramonte A. bandyopadhyay S. bansal L. barak M. barakat E.L. barberio D. barberis M. barbero M.Z. barel K.N. barends T. barillari M-S. barisits T. barklow P. baron D.A. baron Mo The ATLAS Collaboration

The identification of jets originating from quarks and gluons,often referred to as quark/gluon tagging,plays an important role in various analyses performed at the Large Hadron Collider,as Standard Model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced *** paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration,using √s=13 TeV proton–proton collision data with an integrated luminosity of 140 fb^(-1) collected by the ATLAS *** taggers with high performances in rejecting jets from gluon over jets from quarks are studied:one tagger is based on requirements on the number of inner-detector tracks associated with the jet,and the other combines several jet substructure observables using a boosted decision tree.A method is established to determine the quark/gluon fraction in data,by using quark/gluon-enriched subsamples defined by the jet *** in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.

关键词： ATLAS JET QUARK GLUON TAGGING