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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Shengjun Zhang Mingliang Wang Xia Ai Yichun Cui Xin Liu Jiaqi Liu Gang Meng Zhaohui Qi Yuan Sun Yunhui Tang Hui Xue National Key Laboratory of Science & Technology on Test Physics and Numerical Mathematics Beijing China The Institute of Effectiveness Evaluation of Flying Vehicle Beijing China School of materials science and technology Beijing University of Technology Beijing China Beijing Institute of system engineering Beijing China

In this paper, the development history of metamaterials (MTMs) and Frequency selective surfaces (FSS) was sketched, and the two conception was discussed. Furthermore, state of the art of both terms was introduced and ... 详细信息

关键词： Frequency selective surfaces Metamaterials Lattices Crystals physics Electromagnetics Sun

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Attosecond Molecular Angular Streaking with All-Ionic Fragments Detection

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Physical Review Letters 2019年第22期123卷 223204-223204页

作者： Wei Quan Vladislav V. Serov MingZheng Wei Meng Zhao Yu Zhou YanLan Wang XuanYang Lai Anatoli S. Kheifets XiaoJun Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Department of Theoretical Physics Saratov State University 83 Astrakhanskaya Saratov 410012 Russia Research School of Physics The Australian National University Canberra Australian Capital Territory 2601 Australia

Attosecond angular streaking (or “attoclock”) is an insightful technique for probing the ultrafast electron dynamics in strong laser fields. Up until recently, this technique relied solely on an accurate measurement of the photoelectron momentum distribution and has remained restricted to atomic targets. Here, we propose a novel attosecond angular streaking scheme applicable to molecules, for which the ionic fragments of dissociative ionization are detected in the polarization plane of a close-to-circular polarized laser light. Our ionic attoclock measurements are consistent with theoretical results from a numerical solution of the time-dependent Schrödinger equation and an upper bound of 10 as on the tunneling time from the attoclock readings in the H2 molecule has been given, which is significantly smaller than any definitions of tunneling time available in the literatures.

关键词： Electronic excitation & ionization Multiphoton or tunneling ionization & excitation Strong field excitation Strong-field-induced spectra Ultrafast phenomena

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A method for feature extraction based on SVD and machine learning

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IOP Conference Series: Materials science and Engineering 2019年第5期569卷

作者： Wei Mao Shuxian Huang Xin Liu Hongyan Liu Jiaqi Liu Yi Shu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics 100076 China Beijing Institute of Precision Mechatronics and Controls 100076 China Beijing Institute of Long March Vehicle 100076 China

By studying the shortcomings of feature, which extracted from Radar-Cross Section(RCS),using mathematical and statistical method, using the idea of extracting abstract features in image recognition and speech recognition by artificial intelligence for reference[2][3]. This paper explores the possibility of extracting abstract features of target's RCS sequence, and proposes an abstract feature extraction method of RCS sequence based on singular value decomposition(SVD) feature decomposition. Because of the poor interpretability of abstract features, four different machine learning algorithms are used to classify the extracted Abstract features. The experimental results show that the machine learning algorithm can classify different types of spatial objects with high accuracy, which shows that the RCS features of different spatial objects can be characterized by abstract features.

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Anisotropic and mutable magnetization in Kondo lattice CeSb2

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Chinese physics B 2017年第6期26卷 319-323页

作者：张云朱燮刚胡丙锋谭世勇谢东华冯卫刘琴张文刘瑜宋海峰罗丽珠张政军赖新春 Science and Technology on Surface Physics and Chemistry Laboratory Department of Engineering Physics Tsinghua University Key Laboratory of Neutron Physics Institute of Nuclear Physics and ChemistryChina Academy of Engineering Physics Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Software Center for High Performance Numerical Simulation China Academy of Engineering Physics Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

We have systematically studied the behaviors of the resistivity and magnetization of CeSb2 single crystals as a function of temperature and external field. Four anomalies in the resistivity/magnetization-versus-temperature curves are observed at low magnetic field. They are located at 15.5 K, 11.5 K, 9.5 K, and 6.5 K, corresponding to the paramagnetic–magnetically ordered state（MO）, MO-antiferromagnetic（AFM）, AFM–AFM, and AFM–ferromagnetic（FM） transitions, *** anomaly at 9.5 K is only visible with H‖[010] by magnetic susceptibility measurements, indicating that the AFM–AFM transition only happens along [010] direction in ab-plane. The four magnetic transitions are strongly suppressed by high external field. Finally, the field-temperature phase diagrams of CeSb2 with different orientations of the applied field in ab-plane are constructed and indicate the highly anisotropic nature of the magnetization of CeSb2.

关键词： CeSb2 electronic properties magnetic properties

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Suppressing the effects of ionospheric scintillation on geosynchronous SAR by optimised orbit design

Suppressing the effects of ionospheric scintillation on geos...

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2017 International Conference on Radar Systems, Radar 2017

作者： Li, YuanHao Liu, XiangRong Hu, Cheng Dong, XiChao School of Information and Electronics Beijing Institute of Technology 100081 China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics 100076 China Beijing Key Laboratory of Embedded Real-time information Processing Technology 100081 China

ISBN: (纸本)9781785615153

An L band geosynchronous synthetic aperture radar (GEO SAR) will be sensitive to ionosphere scintillation because of its low carrier frequency. Meanwhile, because of the high orbit, GEO SAR has a higher probability to meet ionospheric scintillation. In this paper, we propose an orbit strategy for eliminating the impacts of ionospheric scintillation. It is realized by selecting a proper orbit element (time past perigee) to avoid imaging for the sensitive region of ionospheric scintillation during the eruption time interval of ionospheric scintillation with the highest probability. Finally, the simulation based on systems tool kit (STK) software was conducted to verify the effectiveness of the method. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Synthetic aperture radar

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Measurement of the masses and widths of the Σc(2455)+and Σc(2520)+baryons

arXiv

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arXiv 2021年

作者： Yelton, J. Adachi, I. Ahn, J.K. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bessner, M. Bhardwaj, V. Bhuyan, B. Bilka, T. Biswal, J. Bozek, A. Bračko, M. Branchini, P. Browder, T.E. Budano, A. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. Dash, N. De Nardo, G. De Pietro, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Giri, A. Goldenzweig, P. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hara, T. Hartbrich, O. Hayasaka, K. Hayashii, H. Hou, W.-S. Hsu, C.-L. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Jin, Y. Joo, K.K. Kaliyar, A.B. Kang, K.H. Kato, Y. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, K.-H. Kim, S.H. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kumara, K. Kwon, Y.-J. Lange, J.S. Laurenza, M. Lee, S.C. Li, J. Li, L.K. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. MacQueen, C. Masuda, M. Matsuda, T. Matvienko, D. McNeil, J.T. Merola, M. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Moon, T.J. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Niiyama, M. Nisar, N.K. Nishida, S. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pardi, S. Park, H. Park, S.-H. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Prencipe, E. Prim, M.T. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sakai, Y. Sandilya, S. Sangal, A. Santelj, L. Sanuki, T. Savinov, V. Schnell, G. Schueler, J. Schwanda, C. Seino, Y. Senyo, K. Sevior, M.E. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Electronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Justus-Liebig-Universität Gießen Gießen35392 Germany Gifu University Gifu501-1193 Japan Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics and Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan National Research University Higher School of Economics Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Guwahati Assam 781039 India Indian Institute of Technology Hyderabad Telangana 502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli NapoliI-80126 Italy INFN - Sezione di Roma Tre RomaI-00146 Italy INFN - Sezione di Torino TorinoI-10125 Italy Advanced Scienc

Using 980 fb-1of data collected with the Belle detector operating at the KEKB asymmetric-energy e+e-collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the Σc(2455)+and Σc(2520)+charmed baryons. We find M(Σc(2455)+)-M(Λc+) = 166.17± 0.05+0.16-0.07MeV/c2, Γ(Σc(2455)+) = 2.3 ± 0.3 ± 0.3 MeV/c2}, M(Σc(2520)+)-M(Λc+) = 230.9 ± 0.5+0.5-0.1MeV/c2, and Γ(Σc(2520)+) = 17.2+2.3 +3.1-2.1 -0.7MeV /c2, where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the Σcstates. © 2021, CC BY.

关键词： Hadrons

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An Experimental Study on the Object Shielding Performance of Discrete Metal Wire Array

An Experimental Study on the Object Shielding Performance of...

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IEEE International Conference on Computational Electromagnetics (ICCEM)

作者： Weidong Wang Xin Liu Mingliang Wang Jiaqi Liu Gang Meng Zhiyong Gao Lei Mu Xia Ai Shengjun Zhang Jianbing Li National Key Laboratory of Science and Technology on Test Physics Beijing Institute of Space Long March Vehicle Beijing China

ISBN: (纸本)9781538612422

In this paper, a method of shielding the object behind a discrete metal wire array is proposed and verified by anechoic chamber experiments. Results show that if the metal wire array is dense enough (cell size is smaller than half of the wavelength), the object behind it can be effectually shielded by the discrete metal wire array. The principle can be applied to electromagnetic camouflage and protection.

关键词： anechoic chambers (electromagnetic) electromagnetic shielding Electromagnetic shielding half-wave ELECTRIC WIRE shielding properties Metals Cell Size Dense arrays

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Erratum: "A structural modeling approach to solid solutions based on the similar atomic environment" [J. Chem. Phys. 153, 034101 (2020)]

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The Journal of chemical physics 2020年第8期153卷 089901页

作者： Fuyang Tian De-Ye Lin Xingyu Gao Ya-Fan Zhao Hai-Feng Song Institute for Applied Physics Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science University of Science and Technology Beijing Beijing 100083 China. CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China. Institute of Applied Physics and Computational Mathematics Beijing 100088 China.

Due to a misunderstanding at the proof stage, the authors’ contribution was not stated clearly in the original paper.1 Additionally, the information on the co-c

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First test of Lepton Flavor Universality in the charmed baryon decays Ω0c → Ω-+ν using data of the Belle experiment

arXiv

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arXiv 2021年

作者： Li, Y.B. Shen, Chengping P. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bernlochner, F. Bessner, M. Bhuyan, B. Bilka, T. Bobrov, A. Bodrov, D. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T.E. Budano, A. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Dash, N. De Nardo, G. De Pietro, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Giri, A. Goldenzweig, P. Golob, B. Graziani, E. Gudkova, K. Hadjivasiliou, C. Hara, T. Hayasaka, K. Hayashii, H. Hedges, M.T. Hou, W.-S. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jang, E.-J. Jia, S. Jin, Y. Joo, K.K. Kahn, J. Kang, K.H. Kawasaki, T. Kichimi, H. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, K.-H. Kim, K.T. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kumar, M. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lam, T. Laurenza, M. Lee, S.C. Li, J. Li, L.K. Li, Y. Gioi, L. Li Libby, J. Lieret, K. Liventsev, D. Martini, A. Masuda, M. Matvienko, D. Maurya, S.K. Merola, M. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Nakao, M. Narwal, D. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Oskin, P. Pakhlov, P. Pakhlova, G. Pang, T. Pardi, S. Park, S.-H. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Prencipe, E. Prim, M.T. Röhrken, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sandilya, S. Sangal, A. Santelj, L. Savinov, V. Schnell, G. Schueler, J. Schwanda, C. Seino, Y. Senyo, K. Sevior, M.E. Shapkin, M. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of Chung-Ang University Seoul06974 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany Duy Tan University Hanoi100000 Viet Nam University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Gifu University Gifu501-1193 Japan Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan National Research University Higher School of Economics Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research SAS Nagar Mohali140306 India Indian Institute of Technology Satya Nagar Bhubaneswar751007 India Indian Institute of Technology Assam Guwahati781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli NapoliI-80126 Italy INFN - Sezione di Roma Tre RomaI-00146

We present the first observation of the Ω0c → Ω−µ+νµ decay and present measurements of the branching fraction ratios of the Ω0c → Ω−+ν decays compared to the reference mode Ω0c → Ω−π+, ( = e or µ). This analysis is based on 89.5 fb−1, 711 fb−1, and 121.1 fb−1 data samples collected with the Belle detector at the KEKB asymmetric-energy e+e− collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The Ω0c signal yields are extracted by fitting MΩ and MΩπ spectra. The branching fraction ratios B(Ω0c → Ω−e+νe)/B(Ω0c → Ω−π+) and B(Ω0c → Ω−µ+νµ)/B(Ω0c → Ω−π+) are measured to be 1.98 ± 0.13 (stat.) ± 0.08 (syst.) and 1.94 ± 0.18 (stat.) ± 0.10 (syst.), respectively. The ratio of B(Ω0c → Ω−e+νe)/B(Ω0c → Ω−µ+νµ) is measured to be 1.02 ± 0.10 (stat.) ± 0.02 (syst.), which is consistent with the expectation of lepton flavor universality. Copyright © 2021, The Authors. All rights reserved.

关键词： Germanium alloys

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Dynamics and pattern formation of ring dark solitons in a two-dimensional binary Bose-Einstein condensate with tunable interactions

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Physical Review E 2019年第6期99卷 062216-062216页

作者： Zhang-Ming He L. Wen Ya-Jun Wang G. P. Chen R.-B. Tan C.-Q. Dai Xiao-Fei Zhang College of Science Hunan University of Technology Zhuzhou 412007 China College of Physics and Electronic Engineering Chongqing Normal University Chongqing 400047 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi'an 710600 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 100049 China School of Physics and Mechtronic Engineering Sichuan University of Art and Science Dazhou 635000 China College of Mathematics and Physics Chongqing University of Science and Technology Chongqing 401331 China School of Sciences Zhejiang A&F University Lin'an Zhejiang 311300 China

We investigate the dynamics and pattern formation of two ring dark solitons in a two-dimensional binary Bose-Einstein condensate with tunable intercomponent interaction via numerical simulation of the time-dependent Gross-Pitaevskii equation. Both the black and gray ring dark solitons are considered for cases where the modulation frequency of the intercomponent interaction is resonant or nonresonant with the one of the trapping potential. Our results show that in the presence of periodic modulation of the intercomponent interaction not only are the lifetimes of the ring dark solitons largely extended but also their decaying dynamics are dramatically affected. Before snaking instability sets in, new ring dark solitons are formed, and both the numbers and depths of the ring dark solitons exhibit collective oscillations. With the development of instability, the system exhibits different decaying processes, and a variety of decay profiles, such as vortex necklace, distorted octagon, vortex-antivortex ring, and cross, are formed, showing a strong dependence on the modulation frequency of the intercomponent interaction and the initial depth of the ring dark soliton.

关键词： Bose-Einstein condensates Cold atoms & matter waves Quantum control Ultracold collisions

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