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arXiv 2018年

作者： Wo, Hongliang Wang, Qisi Shen, Yao Zhang, Xiaowen Hao, Yiqing Feng, Yu Shen, Shoudong He, Zheng Pan, Bingying Wang, Wenbin Nakajima, K. Ohira-Kawamura, S. Steffens, P. Boehm, M. Schmalzl, K. Forrest, T.R. Matsuda, M. Zhao, Yang Lynn, J.W. Yin, Zhiping Zhao, Jun State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Institute of Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Materials and Life Science Division J-PARC Center Tokai Ibaraki319-1195 Japan Institut Laue-Langevin 71 Avenue des Martyrs Grenoble Cedex 938042 France Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science at ILL 71 Avenue des Martyrs Grenoble38000 France Diamond Light Source Harwell Campus DidcotOX11 0DE United Kingdom Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Physics and Center for Advanced Quantum Studies Beijing Normal University Beijing100875 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

We report neutron scattering measurements of single-crystalline YFe2Ge2 in the normal state, which has the same crystal structure to the 122 family of iron pnictide superconductors. YFe2Ge2 does not exhibit long range magnetic order, but exhibits strong spin fluctuations. Like the iron pnictides, YFe2Ge2 displays anisotropic stripe-type antiferromagnetic spin fluctuations at (π, 0, π). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wavevector (0, 0, π). These ferromagnetic spin fluctuations are isotropic in the (H, K) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe2Ge2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials. Copyright © 2018, The Authors. All rights reserved.

关键词： Crystal structure

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Fano resonances in interacting graphene nanodisk oligomers and their applications for sensing

Fano resonances in interacting graphene nanodisk oligomers a...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Jialong Peng Jianfa Zhang Zhihong Zhu Xiaodong Yuan Shiqiao Qin College of Optoelectronic Science and Engineering National University of Defense Technology Changsha China State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China

ISBN: (纸本)9781509060948

Summary form only given. Highly doped graphene has been demonstrated to be a promising plasmonic material where the excitation of surface plasmons can significantly enhance the interaction with light [1, 2]. Here we investigate the coupling effects in graphene nanodisk oligomers (heptamer) [2] and try to employ one of the interesting phenomena from the coupling, the so called Fano-resonances, for sensing applications [3]. We show numerically that the frequency of localized surface plasmon resonances in the graphene nanostructures are very sensitive to changes in the ambient dielectric environment and can be used in sensing by measuring the resonance wavelength shifts.

关键词： Graphene Plasmons Sensors Nanostructures Couplings Refractive index Electromagnetics

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Dual-frequency tunable terahertz half-wave plate based on coupling and hybridization effect in graphene nanodisk dimers

Dual-frequency tunable terahertz half-wave plate based on co...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Jialong Peng Xiaodong Yuan Zhihong Zhu Jianfa Zhang Shiqiao Qin College of Optoelectronic Science and Engineering National University of Defense Technology Changsha China State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China

Graphene appears to be a good candidate in designing tunable devices operating in THz spectral ranges owing to its tunability of conductivity. It can be tuned dynamically via electrostatic doping [1, 2]. Here we propose a tunable terahertz half wave plate based on the hybridization effect caused by coupling interactions between plasmonic resonances in the two coupled graphene nanodisks (CGN). We show numerically that using a period array of coupled isotropic graphene nanostructures in lieu of uncoupled anisotropic graphene nanostructures [3] is an alternative route to achieve polarization conversion, which may lead to some other novel phenomena and interesting applications.

关键词： Graphene Plasmons Couplings Nanostructures Gold Frequency conversion Resonant frequency

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The Influence of InGaN Interlayer on the Performance of InGaN/GaN Quantum-Well-Based LEDs at High Injections

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Chinese Physics Letters 2015年第2期32卷 143-147页

作者： RAJABI Kamran 曹文彧 SHEN Tihan 季清斌贺娟杨薇李磊李丁王琪胡晓东 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking University Joule Physics Laboratory School of ComputingScience and EngineeringCollege of Science and TechnologyUniversity of Salford Dongguan Institute of Optoelectronics Peking University

Introducing a thin InGaN interlayer with a relatively lower indium content between the quantum well （QW） and barrier results in a step-like InxGa1-xN/GaN potential barrier on one side of the QW. This change in the active region leads to a significant shift in photolumineseence （PL） and electroluminescence （EL） emissions to a longer wavelength compared with the conventional QW based light-emitting diodes. More importantly, an improvement against efficiency droop and an enhancement in light output power at the high-current injection are observed in the modified light-emitting diode structures. The role of the inserted layer in these improvements is investigated by simulation in detail, which shows that the creation of more sublevels in the valence band and the increase of hole concentration inside QWs are the main reasons for these improvements.

关键词： InGaN The Influence of InGaN Interlayer on the Performance of InGaN/GaN Quantum-Well-Based LEDs at High Injections

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Numerical study on fracture initiation and propagation of reservoirs subjected to hydraulic perforating

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Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety engineering 2016年第3期33卷 544-550页

作者： Zhao, Xi Dai, Tao Ju, Yang Hu, Huifang Yang, Yongming Gong, Wenbo Beijing100083 China SINOPEC Shengli Oilfield Company Geological Scientific Research Institute DongyingShandong257000 China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology XuzhouJiangsu221116 China Beijing100083 China

Understanding hydraulic fracturing initiation and propagation in low permeability reservoir is of great significance for exploiting and enhancing recovery of unconventional oil and gas resources. Cement, mortar and quartz sand were mixed to model the natural shale rock. Our laboratory tests proved that, the mechanical properties, especially fracture toughness, were close to those of the natural shale rock. The numerical codes FRANC3D and ANSYS were adopted to probe into initiation and propagation of hydraulic fractures in reservoir rock in different horizontal stress ratio and perforation layout. The simulation and analysis have indicated that:1) Perforation fracturing initiation and propagation in three dimensions are properly simulated by FRANC3D and ANSYS;2) The initiation fracture pressure decreases with the increase of horizontal stress ratio;3) Perforation parallel to the maximum horizontal stress has the smallest initiation fracture pressure. Propagation plane deflection tends to be parallel to the maximum horizontal stress when they are not in parallel;4) Linearly distributed perforation is superior to symmetric perforation and staggered perforation as it provides the minimum initiation fracture pressure. © 2016, Editorial Board of Journal of Mining & Safety engineering. All right reserved.

关键词： Hydraulic fracturing

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Survey on cyberspace security

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Science China(Information Sciences) 2015年第11期58卷 5-47页

作者： ZHANG HuanGuo HAN WenBao LAI XueJia LIN DongDai MA JianFeng LI JianHua Computer School of Wuhan University State Key Laboratory of Mathematics Engineering and Advanced Computing Department of Computer Shanghai Jiaotong University Institute of Information Engineering Chinese Academy of Sciences School of Cyber Engineering Xidian University School of Information Security Engineering Shanghai Jiaotong University

Along with the rapid development and wide application of information technology, human society has entered the information era. In this era, people live and work in cyberspace. Cyberspace is the collection of all information systems; it is the information environment for human survival. Therefore, it is necessary to ensure the security of cyberspace. This paper gives a comprehensive introduction to research and development in this field, with a description of existing problems and some currently active research topics in the areas of cyberspace itself, cyberspace security, cryptography, network security, information system security and information content security.

关键词： cyberspace security information security cryptography network security information system security information content security

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Effects of Light Quality on Sugar Metabolism,Yield and Quality of Tomato Fruits

Effects of Light Quality on Sugar Metabolism,Yield and Quali...

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The Second Asian Horticultural Congress

作者： Na Sun Min Wei Yan Li Xiufeng Wang Fengjuan Yang Qinghua Shi College of Horticultural Science and Engineering Shandong Agricultural University Scientific Observing and Experimental Station of Environment Controlled Agricultural Engineering in Huang-Huai-Hai Region Ministry of Agriculture State Key Laboratory of Crop Biology

The effects of different light quality[white,red,blue,and red-blue(l:l)]on sugar metabolism,yield and quality of tomato fruits were investigated by using LED lighting in a growth *** results showed that:Compared with ... 详细信息

关键词： red Effects of Light Quality on Sugar Metabolism,Yield and Quality of Tomato Fruits

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Measurement of the top quark Yukawa coupling from tt¯ kinematic distributions in the dilepton final state in proton-proton collisions at s=13 TeV

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Physical Review D 2020年第9期102卷 092013-092013页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfbeck M. Spanring S. Templ W. Waltenberger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat A. Morton Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker B. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenbeek T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno F. Bury C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zobec G. A. Alves G. Correia Silva C. Hensel A. Moraes W. L. Aldá Júnior E. Belchior Batista Das Chagas H. Brandao Malbouisson W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Ener

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at s=13 TeV, corresponding to an integrated luminosity of 137 fb−1, recorded with the CMS detector. The coupling strength with respect to the standard model value, Yt, is determined from kinematic distributions in tt¯ final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for tt¯ production. In particular, the distributions of the mass of the tt¯ system and the rapidity difference of the top quark and antiquark are sensitive to the value of Yt. The measurement yields a best fit value of Yt=1.16−0.35+0.24, bounding Yt<1.54 at a 95% confidence level.

关键词： Higgs bosons Top quark Hadron colliders

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W+W− boson pair production in proton-proton collisions at s=13 TeV

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Physical Review D 2020年第9期102卷 092001-092001页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfbeck M. Spanring S. Templ W. Waltenberger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat A. Morton Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenbeek T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno F. Bury C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zobec G. A. Alves G. Correia Silva C. Hensel A. Moraes W. L. Aldá Júnior E. Belchior Batista Das Chagas H. Brandao Malbouisson W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China University of Illinois at Chicago (UIC) Chicago Illinois USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physic

A measurement of the W+W− boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb−1. The W+W− candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W− events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived.

关键词： W & Z bosons Hadron colliders

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DOAS: Efficient data owner authorized search over encrypted cloud data

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Peer-to-Peer Networking and Applications 2016年第3期11卷 349-360页

作者： Miao, Yinbin Ma, Jianfeng Liu, Ximeng Liu, Zhiquan Zhang, Junwei Wei, Fushan School of Telecommunication Engineering Xidian University Xi’an China School of Computer Science and Technology School of Cyber Engineering Xidian University Xi’an China School of Information Systems Singapore Management University Singapore Singapore State Key Laboratory of Mathematical Engineering and Advanced Computing The PLA Information Engineering University Zhengzhou China

Data outsourcing service can shift the local data storage and maintenance to cloud service provider (CSP) to ease the burden from data owner, but it brings the data security threats as CSP is always considered to honest-but-curious. Therefore, searchable encryption (SE) technique which allows cloud clients (including data owner and data user) to securely search over ciphertext through keywords and selectively retrieve files of interest is of prime importance. However, in practice, data user’s access permission always dynamically varies with data owner’s preferences. Moreover, existing SE schemes which are based on attribute-based encryption (ABE) incur heavy computational burden through attribution revocation and policy updating. To allow data owner to flexibly grant access permissions, we design a secure cryptographic primitive called as efficient data owner authorized search over encrypted data scheme through utilizing identity-based encryption (IBE) technique. The formal security analysis proves that our scheme is secure against chosen-plaintext attack (CPA) and chosen-keyword attack (CKA) without random oracle. Besides, empirical experiments over real-world dataset show that our scheme is efficient and feasible with regard to data access control.

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