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arXiv 2019年

作者： Wehle, Simon Adachi, I. Adamczyk, K. Aihara, H. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Behera, P. Berger, M. Bhardwaj, V. Biswal, J. Bozek, A. Bračko, M. Browder, T.E. Campajola, M. Cao, L. Chang, M.-C. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Dash, N. de Nardo, G. Di Capua, F. Dubey, S. Eidelman, S. Epifanov, D. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Giri, A. Goldenzweig, P. Greenwald, D. Guan, Y. Haba, J. Hartbrich, O. Hayasaka, K. Hayashii, H. Hedges, M.T. Higuchi, T. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Jin, Y. Joffe, D. Kahn, J. Kaliyar, A.B. Karyan, G. Kichimi, H. Kim, D.Y. Kim, K.T. Kim, S.H. Kim, Y.-K. Kinoshita, K. Komarov, I. Korpar, S. Kotchetkov, D. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lange, J.S. Lee, J.Y. Lee, S.C. Li, Y.B. Libby, J. Liptak, Z. Liventsev, D. Luo, T. MacNaughton, J. Masuda, M. Matsuda, T. McNeil, J.T. Merola, M. Metzner, F. Miyata, H. Mizuk, R. Mohanty, G.B. Moon, T.J. Mussa, R. Nakao, M. Natochii, A. Nayak, M. Niebuhr, C. Niiyama, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Onuki, Y. Pakhlov, P. Pakhlova, G. Park, H. Park, S.-H. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Resmi, P.K. Ritter, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sakai, Y. Sandilya, S. Sangal, A. Santelj, L. Savinov, V. Schneider, O. Schnell, G. Schueler, J. Schwanda, C. Schwartz, A.J. Seino, Y. Senyo, K. Sevior, M.E. Shapkin, M. Shiu, J.-G. Shwartz, B. Solovieva, E. Starič, M. Strube, J.F. Sumiyoshi, T. Sutcliffe, W. Takizawa, M. Tamponi, U. Tanida, K. Tao, Y. Tenchini, F. Trabelsi, K. Uchida, M. Uglov, T. Unno, Y. Uno, S. Ushiroda, Y. University of the Basque Country UPV EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory Upton New York11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-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 Hayama240-0193 Japan 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 Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany Hiroshima Institute of Technology Hiroshima731-5193 Japan IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Hyderabad Telangana502285 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 Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 Japan J. Stefan Institute Ljubljana1000 Slovenia Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany University of Tokyo Kashiwa277-8583 Japan Kennesaw State University KennesawGA30144 United States Korea Institute of Science and Technology Information Daejeon34141 Korea Republic of Kor

We present a measurement of RK∗, the branching fraction ratio B(B → K∗µ+µ−)/ B(B → K∗e+e−), for both charged and neutral B mesons. The ratio for the charged case, RK∗+, is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass, q2. The analysis is based on a data sample of 711 fb−1, containing 772×106 BB¯ events, recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The obtained results are consistent with Standard Model expectations. Copyright © 2019, The Authors. All rights reserved.

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A recursive predictive risk estimate for proximal algorithms

A recursive predictive risk estimate for proximal algorithms

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Feng Xue Runle Du Jiaqi Liu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781479999897

For accurate signal reconstruction, proximal gradient methods generally require proper selection of regularization parameter. In this paper, we develop two data-driven optimization schemes, based on minimization of unbiased predictive risk estimate (UPRE). First, we propose a recursive UPRE to estimate the prediction error during the proximal iterations, which can be used to optimize the regularization parameter. Second, for fast optimization, we parametrize each proximal iterate as a linear combination of few elementary functions (LET), and solve the linear weights by minimizing recursive UPRE. We further exemplify the proposed approaches with the basic iterative shrinkage/thresholding (IST) algorithms for ℓ 1 -minimization. Numerical experiments show that iterating this process leads to higher reconstruction accuracy with remarkably faster computational speed than standard IST.

关键词： Jacobian matrices Prediction algorithms Convergence Gradient methods Signal processing algorithms Standards

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The propagation characteristic of the QPSK signals in reentry plasmas 67

The propagation characteristic of the QPSK signals in reentr...

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67th International Astronautical Congress, IAC 2016

作者： Wu, Runhui Liu, Jiaqi Liu, Xin Ren, Aimin Zhang, Shengjun Meng, Gang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematical China Academy of Launch Vehicle Technology No 1 Nan Da Hong Men Road Beijing China

A spacecraft entering the Earth's atmosphere is enveloped by a plasma layer or sheath due to shock heating of the surrounding air and ablation of the heat shield material, and the plasma sheath may strongly effect the communication between the vehicles and receiver systems. In order to obtain the influence of communication system which is produced by reentry plasmas, a mechanism of QPSK signals through reentry plasmas which surround vehicles travelling at hypersonic velocities is proposed in this paper, and the simulation model of the QPSK signals propagation in plasma sheath is described. Then the energy attenuation and phase variable of QPSK signals which are transmitted by reentry plasmas are computed. The analysis results are shown that the QPSK signals would be shielded thoroughly if the plasma frequency is bigger than carrier frequency, and when the QPSK signals can propagate in reentry plasmas, the bit error probability (BEP) of communication systems would be improved by reentry plasmas which are ability to absorb the signals energy and vary signals phase. The simulation and analysis technique can also be used to calculate many other communication models such as FSK and ASK. Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved.

关键词： Bit error rate

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Experimental test of the irreducible four-qubit Greenberger-Horne-Zeilinger paradox

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Physical Review A 2017年第3期95卷 030103(R)-030103(R)页

作者： Zu-En Su Wei-Dong Tang Dian Wu Xin-Dong Cai Tao Yang Li Li Nai-Le Liu Chao-Yang Lu Marek Żukowski Jian-Wei Pan Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Quantum Information and Quantum Optoelectronic Devices Shanxi Province and Department of Applied Physics of Xi'an Jiaotong University Xi'an 710049 China Institute for Theoretical Physics and Astrophysics Faculty of Mathematics and Informatics University of Gdansk Wita Stwosza 57 80-308 Gdansk Poland

The paradox of Greenberger-Horne-Zeilinger (GHZ) disproves directly the concept of EPR elements of reality, based on the EPR correlations, in an all-versus-nothing way. A three-qubit experimental demonstration of the GHZ paradox was achieved nearly 20 years ago, followed by demonstrations for more qubits. Still, the GHZ contradictions underlying the tests can be reduced to a three-qubit one. We show an irreducible four-qubit GHZ paradox, and report its experimental demonstration. The bound of a three-setting-per-party Bell-GHZ inequality is violated by 7σ. The fidelity of the GHZ state was around 81%, and an entanglement witness reveals a violation of the separability threshold by 19σ.

关键词： Nonlocality Quantum entanglement Quantum foundations Quantum measurements

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Measurement of high energy cosmic rays by the new Tibet hybrid experiment 35

Measurement of high energy cosmic rays by the new Tibet hybr...

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35th International Cosmic Ray Conference, ICRC 2017

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Liu, C. Liu, J.S. Liu, M.Y. Lu, H. Meng, X.R. Miyazaki, T. Mizutani, K. Munakata, K. Nakajima, T. Nakamura, Y. Nanjo, H. Nishizawa, M. Niwa, T. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yamauchi, K. Yang, Z. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences China National Astronomical Observatories Chinese Academy of Sciences China Department of Mathematics and Physics Tibet University China Department of Physics Hebei Normal University China Department of Physics Shandong University China Institute of Modern Physics SouthWest Jiaotong University China Faculty of Engineering Kanagawa University Japan Faculty of Education Utsunomiya University Japan Department of Physics Konan University Japan Research Institute for Science and Engineering Waseda University Japan Faculty of Engineering Yokohama National University Japan Department of Physics Shinshu University Japan Institute for Cosmic Ray Research University of Tokyo Japan Japan National Center for Space Weather China Meteorological Administration China School of Information Science and Engineering Shandong Agriculture University China Saitama University Japan National Institute of Informatics Japan Sakushin Gakuin University Japan College of Science China University of Petroleum China Tokyo Metropolitan College of Industrial Technology Japan Max-Planck-Institut für Physik Germany Escuela de Ciencias Físicas y Nanotechnología Yachay Tech. Ecuador College of Industrial Technology Nihon University Japan Shonan Institute of Technology Japan Japan Atomic Energy Agency Japan

We have started a new hybrid air shower experiment at Yangbajing (4300 m a.s.l.) in Tibet in February 2014. This new hybrid experiment consists of the YAC-II comprised of 124 core detectors placed in the form of a square grid of 1.9 m spacing covering about 500 m2, the Tibet-III air shower array with the total area of about 50, 000 m2 and the underground MD array consisting of 80 cells, with the total area of about 4, 200 m2. This hybrid-array system is used to observe air showers of high energy celestial gamma-ray origin and those of nuclear-component origin. In this paper, a short review of the experiment will be followed by an overview on the current results on energy spectrum and chemical composition of CRs and test of hadronic interaction models. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Gamma rays

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The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

arXiv

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arXiv 2019年

作者： Porth, Oliver Chatterjee, Koushik Narayan, Ramesh Gammie, Charles F. Mizuno, Yosuke Anninos, Peter Baker, John G. Bugli, Matteo Chan, Chi-Kwan Davelaar, Jordy Zanna, Luca Del Etienne, Zachariah B. Fragile, P. Chris Kelly, Bernard J. Liska, Matthew Markoff, Sera McKinney, Jonathan C. Mishra, Bhupendra Noble, Scott C. Olivares, Héctor Prather, Ben Rezzolla, Luciano Ryan, Benjamin R. Stone, James M. Tomei, Niccolò White, Christopher J. Younsi, Ziri Akiyama, Kazunori Alberdi, Antxon Alef, Walter Asada, Keiichi Azulay, Rebecca Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Bintley, Dan Blackburn, Lindy Boland, Wilfred Bouman, Katherine L. Bower, Geoffrey C. Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Byun, Do-Young Carlstrom, John E. Chael, Andrew Chatterjee, Shami Chen, Ming-Tang Chen, Yongjun Cho, Ilje Christian, Pierre Conway, John E. Cordes, James M. Crew, Geoffrey B. Cui, Yuzhu Laurentis, Mariafelicia De Deane, Roger Dempsey, Jessica Desvignes, Gregory Doeleman, Sheperd S. Eatough, Ralph P. Falcke, Heino Fish, Vincent L. Fomalont, Ed Fraga-Encinas, Raquel Freeman, Bill Friberg, Per Fromm, Christian M. Gómez, José L. Galison, Peter García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Hecht, Michael H. Hesper, Ronald Ho, Luis C. Ho, Paul Honma, Mareki Huang, Chih-Wei L. Hughes, David H. Ikeda, Shiro Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Janssen, Michael Jeter, Britton Jiang, Wu Johnson, Michael D. Jorstad, Svetlana Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Jae-Young Kim, Junhan Kim, Jongsoo Kino, Motoki Koay, Jun Y.I. Koch, Patrick M. Koyama, Shoko Kramer, Michael Kramer, Carsten Krichbaum, Thomas P. Kuo, Cheng-Yu Lauer, Tod R. Lee, Sang-Sung Li, Yan-Rong Li, Zhiyuan Lindqvist, Michael Liu, Kuo Liuzzo, Elisabetta Lo, Wen-Ping Lobanov, Andrei P. Loinard, Lau Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Institut für Theoretische Physik Goethe-Universität Frankfurt Max-von-Laue-Straße 1 Frankfurt am MainD-60438 Germany Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Black Hole Initiative at Harvard University 20 Garden Street CambridgeMA02138 United States Department of Astronomy Department of Physics University of Illinois UrbanaIL61801 United States Lawrence Livermore National Laboratory LivermoreCA94550 United States Gravitational Astrophysics Laboratory NASA Goddard Space Flight Center GreenbeltMD20771 United States Joint Space-Science Institute University of Maryland College ParkMD20742 United States IRFU Département d’Astrophysique Laboratoire AIM CEA/DRF-CNRS-Université Paris Diderot CEA-Saclay F-91191 France Steward Observatory and Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Data Science Institute University of Arizona 1230 N. Cherry Ave. TucsonAZ85721 United States Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Dipartimento di Fisica e Astronomia Università di Firenze e INFN – Sez. di Firenze via G. Sansone 1 Sesto F.noI-50019 Italy INAF Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 FirenzeI-50125 Italy Department of Mathematics West Virginia University MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States Department of Physics & Astronomy College of Charleston 66 George St. CharlestonSC29424 United States Department of Physics University of Maryland Baltimore County BaltimoreMD21250 United States CRESST NASA Goddard Space Flight Center GreenbeltMD20771 United States Anton Pannekoek Institute for Astronomy & GRAPPA University of Amsterdam Postbus 94249 Amsterdam1090G

Recent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope (EHT) and high precision astrometry of the Galactic Center at close to the event horizon scale by the GRAVITY experiment motivate the development of numerical source models that solve the equations of general relativistic magnetohydrodynamics (GRMHD). Here we compare GRMHD solutions for the evolution of a magnetized accretion flow where turbulence is promoted by the magnetorotational instability from a set of nine GRMHD codes: Athena++, BHAC, Cosmos++, ECHO, H-AMR, iharm3D, HARM-Noble, IllinoisGRMHD and KORAL. Agreement between the codes improves as resolution increases, as measured by a consistently applied, specially developed set of code performance metrics. We conclude that the community of GRMHD codes is mature, capable, and consistent on these test problems. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnetohydrodynamics

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ISAR target micro-Doppler feature extraction and recognition method based on PCA and ICA

ISAR target micro-Doppler feature extraction and recognition...

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IET International Radar Conference 2015

作者： Bai, Jinliang Jiang, Zhiye Liu, Jiaqi Gao, Lu Liu, Hongyan Xu, Feng Qin, Peng Li, Hu Chen, Shuyuan Liu, Shengdong National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781849199940

Micro-Doppler features can be regarded as a unique signature of ISAR targets and provide critical information for target recognition. This paper proposes an ISAR micro-Doppler feature extraction and recognition method based on combination algorithm of principle component analysis (PCA) and independent component analysis (ICA). In order to decrease computation burden, PCA algorithm is first applied to reduce dimension and second order correlation, and then ICA decomposes micro-Doppler represented in time frequency domain into a set of independent basis components, which consist the micro-Doppler feature subspace. Target recognition is transformed to calculate the projection coefficient in the subspace. The experimental results verify the correctness and effectiveness of the proposed method.

关键词： Independent component analysis

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Communication performance optimization of spaceborne/airborne Radar networks

Communication performance optimization of spaceborne/airborn...

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IET International Radar Conference 2015

作者： Li, Hu Gao, Lu Liu, Jiaqi Liu, Hongyan Jiang, Zhiye Bai, Jinliang Xu, Feng Chen, Shuyuan Liu, Shengdong Zhu, Guangsheng Liu, Xuemei National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781849199940

In this paper, we investigate communication performance optimization problem of spaceborne/airborne Radar networks. A model of spaceborne/airborne Radar networks with propagation delay and power constraints is given first. A Quadric Lyapunov function based Algorithm (QLA) is then proposed aiming at greedily minimizing an expression containing Lyapunov drift. We prove two main conclusions, one is that the communication network of spaceborne/airborne Radars under QLA is stable, the other is that power constraints are met. Upper bounds of queue backlogs and a lower bound of utility function are established through theoretical analysis, and how propagation delay jeopardizes utility performance is also demonstrated. Simulation of QLA is carried out in a scenario consists of 6 nodes, and results are in accordance with theoretical conclusions.

关键词： Lyapunov methods

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Study of RF structure for W band sheet beam EIK

Study of RF structure for W band sheet beam EIK

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IET International Radar Conference 2015

作者： Chen, Shuyuan Jiang, Zhiye Liu, Jiaqi Gao, Lu Bai, Jingliang Liu, Hongyan Meng, Gang Xu, Feng Li, Hu Liu, Chengguo Zhu, Guangsheng National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781849199940

Microwave tubes are vacuum electron devices used for the generation and amplification of radio frequencies in the microwave frequency range. Klystron is a kind of microwave tubes which is used in radar. A sheet-beam Extended Interaction Klystron (SBEIK) is an attractive MMW amplifier because of its high gain per unit length and compact configuration. The RF structure is an important part of the whole tube, which is used for beam wave interaction. In this paper, two kinds of barbell cavity has been studied. The difference between the separating multi-gap barbell resonant cavity and the strong coupling multi-gap barbell cavity has been discussed. RF parameters have been calculated by 3D simulations.

关键词： Microwaves

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An iterative sure-let approach to sparse reconstruction

An iterative sure-let approach to sparse reconstruction

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Feng Xue Thierry Blu Runle Du Jiaqi Liu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Dept. of Electronic Engineering The Chinese University of Hong Kong Shatin N.T.Hong Kong

Sparsity-promoting regularization is often formulated as ℓv-penalized minimization (0

ISBN: (纸本)9781479999897

Sparsity-promoting regularization is often formulated as ℓv-penalized minimization (0

关键词： Optimization Jacobian matrices Convergence Iterative methods Minimization Standards Signal to noise ratio

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