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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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Ordered magnetic fields around the 3C 84 central black hole

arXiv

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arXiv 2024年

作者： Paraschos, Georgios Filippos Kim, J.-Y. Wielgus, M. Röder, J. Krichbaum, T.P. Ros, E. Agudo, I. Myserlis, I. Moscibrodzka, M. Traianou, E. Zensus, J.A. Blackburn, L. Chan, C.-K. Issaoun, S. Janssen, M. Johnson, M.D. Fish, V.L. Akiyama, K. Alberdi, A. Alef, W. Algaba, J.C. Anantua, R. Asada, K. Azulay, R. Bach, U. Baczko, A.-K. Ball, D. Baloković, M. Barrett, J. Bauböck, M. Benson, B.A. Bintley, D. Blundell, R. Bouman, K.L. Bower, G.C. Boyce, H. Bremer, M. Brinkerink, C.D. Brissenden, R. Britzen, S. Broderick, A.E. Broguiere, D. Bronzwaer, T. Bustamante, S. Byun, D.-Y. Carlstrom, J.E. Ceccobello, C. Chael, A. Chang, D.O. Chatterjee, K. Chatterjee, S. Chen, M.T. Chen, Y. Cheng, X. Cho, I. Christian, P. Conroy, N.S. Conway, J.E. Cordes, J.M. Crawford, T.M. Crew, G.B. Cruz-Osorio, A. Cui, Y. Dahale, R. Davelaar, J. De Laurentis, M. Deane, R. Dempsey, J. Desvignes, G. Dexter, J. Dhruv, V. Doeleman, S.S. Dougal, S. Dzib, S.A. Eatough, R.P. Emami, R. Falcke, H. Farah, J. Fomalont, E. Ford, H.A. Foschi, M. Fraga-Encinas, R. Freeman, W.T. Friberg, P. Fromm, C.M. Fuentes, A. Galison, P. Gammie, C.F. García, R. Gentaz, O. Georgiev, B. Goddi, C. Gold, R. Gómez-Ruiz, A.I. Gómez, J.L. Gu, M. Gurwell, M. Hada, K. Haggard, D. Haworth, K. Hecht, M.H. Hesper, R. Heumann, D. Ho, L.C. Ho, P. Honma, M. Huang, C.L. Huang, L. Hughes, D.H. Ikeda, S. Impellizzeri, C.M.V. Inoue, M. James, D.J. Jannuzi, B.T. Jeter, B. Jaing, W. Jiménez-Rosales, A. Jorstad, S. Joshi, A.V. Jung, T. Karami, M. Karuppusamy, R. Kawashima, T. Keating, G.K. Kettenis, M. Kim, D.-J. Kim, J. Kim, J. Kino, M. Koay, J.Y. Kocherlakota, P. Kofuji, Y. Koch, P.M. Koyama, S. Kramer, C. Kramer, J.A. Kramer, M. Kuo, C.-Y. La Bella, N. Lauer, T.R. Lee, D. Lee, S.-S. Leung, P.K. Levis, A. Li, Z. Lico, R. Lindahl, G. Lindqvist, M. Lisakov, M. Liu, J. Liu, K. Liuzzo, E. Lo, W.-P. Lobanov, A.P. Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Department of Astronomy and Atmospheric Sciences Kyungpook National University Daegu702-701 Korea Republic of Institute of Physics Silesian University in Opava Bezručovo nám. 13 OpavaCZ-746 01 Czech Republic Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Avenida Divina Pastora 7 Local 20 GranadaE-18012 Spain Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Black Hole Initiative Harvard University 20 Garden Street CambridgeMA02138 United States Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Steward Observatory 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 Program in Applied Mathematics University of Arizona 617 N. Santa Rita TucsonAZ85721 United States NASA Hubble Fellowship Program Einstein Fellow United States Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Physics Faculty of Science Universiti Malaya Kuala Lumpur50603 Malaysia Department of Physics & Astronomy The University of Texas at San Antonio One UTSA Circle San AntonioTX78249 United States Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Sec. 4 Roosevelt Rd. Taipei10617 Taiwan Departament d’Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 Burjassot ValènciaE-46100 Spain Observatori Astronòmic Universitat de València C. Catedrático José Beltrán 2 València PaternaE-46980 Spain Department of Space Earth and Environment Chalmers University of Technology Onsala Space Observatory OnsalaSE-43992 Sweden Yale C

Context. 3C 84 is a nearby radio source with a complex total intensity structure, showing linear polarisation and spectral patterns. A detailed investigation of the central engine region necessitates the use of very-long-baseline interferometry (VLBI) above the hitherto available maximum frequency of 86 GHz. Aims. Using ultrahigh resolution VLBI observations at the currently highest available frequency of 228 GHz, we aim to perform a direct detection of compact structures and understand the physical conditions in the compact region of 3C 84. Methods. We used Event Horizon Telescope (EHT) 228 GHz observations and, given the limited (u, v)-coverage, applied geometric model fitting to the data. Furthermore, we employed quasi-simultaneously observed, ancillary multi-frequency VLBI data for the source in order to carry out a comprehensive analysis of the core structure. Results. We report the detection of a highly ordered, strong magnetic field around the central, supermassive black hole of 3C 84. The brightness temperature analysis suggests that the system is in equipartition. We also determined a turnover frequency of νm = (113 ± 4) GHz, a corresponding synchrotron self-absorbed magnetic field of BSSA = (2.9 ± 1.6) G, and an equipartition magnetic field of Beq = (5.2 ± 0.6) G. Three components are resolved with the highest fractional polarisation detected for this object (mnet = (17.0 ± 3.9)%). The positions of the components are compatible with those seen in low-frequency VLBI observations since 2017-2018. We report a steeply negative slope of the spectrum at 228 GHz. We used these findings to test existing models of jet formation, propagation, and Faraday rotation in 3C 84. Conclusions. The findings of our investigation into different flow geometries and black hole spins support an advection-dominated accretion flow in a magnetically arrested state around a rapidly rotating supermassive black hole as a model of the jet-launching system in the core of 3C 84. However,

关键词： Magnetic fields

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Prediction of iliac limb occlusion after endovascular aneurysm repair for abdominal aortic aneurysm by anatomical and near-wall hemodynamic characteristics combining numerical simulation and in vitro experiment

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Computer Methods and Programs in Biomedicine 2025年 268卷 108845-108845页

作者： Zhang, Xuelan Che, Yue Li, Chunxiao Cao, Xiran Wang, Xiaoxiao Zhang, Yidan Li, Gaoyang Zhu, Jing Luo, Mingyao Shu, Chang School of Mathematics and Physics University of Science and Technology Beijing Beijing 100083 China Department of Chemical Engineering Imperial College London South Kensington Campus LondonSW7 2AZ United Kingdom State Key Laboratory of Cardiovascular Disease Center of Vascular Surgery Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100037 China Institute of Fluid Science Tohoku University 2-1-1 Katahira Aoba-ku Sendai980-8577 Japan Department of Vascular Surgery Central-China Subcenter of National Center for Cardiovascular Diseases Henan Cardiovascular Disease Center Fuwai Central-China Cardiovascular Hospital Central China Fuwai Hospital of Zhengzhou University Zhengzhou450046 China Department of Vascular Surgery Fuwai Yunnan Cardiovascular Hospital Affiliated Cardiovascular Hospital of Kunming Medical University Kunming650102 China Department of Vascular Surgery The Second Xiangya Hospital of Central South University Changsha410000 China

Background and Objective: Iliac limb occlusion (ILO) is a serious complication of endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA), and most require timely reintervention. The study aims to explore pathogenesis, risk factors and prediction models of ILO combining anatomical and near-wall hemodynamic characteristics. Methods: 75 AAA patients with EVAR (occlusion 25;patency 50) were included. Pre-EVAR and early post-EVAR anatomical (proximal neck angulation, radius, curvature, torsion and tortuosity) and near-wall hemodynamic parameters (time-averaged wall shear stress [TAWSS], oscillatory shear index [OSI] and relative residence time [RRT]) were quantified based on numerical simulation validated through in vitro experiment. The causation of ILO was investigated statistically in three perspectives: differences between patent and occluded patients, effect of EVAR and asymmetries between occluded and patent iliac arteries (IAs). A new parameter, the difference ratio of EVAR (DRE) or IAs (DRI), was proposed to evaluate the degree of changes caused by EVAR and asymmetries between bilateral IAs. Results: The occluded patients had higher TAWSS (p = 0.004) and larger torsion of common IA (p = 0.033) at pre-EVAR than patent patients. At early post-EVAR, OSI and RRT of future occluded IA were significantly higher than patent IA. The difference ratio of pre-EVAR and early post-EVAR RRT (DRE of RRT) on occluded IA was also higher than that on patent IA (p = 0.025). A prediction model for ILO (area under curve = 0.924) was developed combining anatomical and near-wall hemodynamic variables, where DRI of pre-EVAR OSI had the highest odds ratio [OR] of 5.45 (1.77‒16.74, p = 0.003), and pre-EVAR radius of external IA had the lowest OR of 0.06 (0.01‒0.45, p = 0.007). Conclusions: High TAWSS and large torsion at pre-EVAR, and excessive increase in RRT by EVAR (DRE) might induce ILO. Higher asymmetry of pre-EVAR OSI between bilateral IAs (DRI) and smaller radius o

关键词： Shear bands

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Chemical short-range ordering and its strengthening effect in refractory high-entropy alloys

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Physical Review B 2021年第10期103卷 104107-104107页

作者： S. D. Wang X. J. Liu Z. F. Lei D. Y. Lin F. G. Bian C. M. Yang M. Y. Jiao Q. Du H. Wang Y. Wu S. H. Jiang Z. P. Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 People's Republic of China Software Center for High Performance Numerical Simulation Chinese Academy of Engineering Physics Beijing 100088 People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088 People's Republic of China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 People's Republic of China

In this work, we perform first-principles calculations, coupled with synchrotron small-angle x-ray scattering (SAXS) to investigate electronic origins of the chemical short-range ordering (CSRO) and to reveal the relationship between CSROs and mechanical properties in a typical bcc (body-centered-cubic) TiZrHfNb high-entropy alloys (HEAs). It was found that existence of an appropriate degree of CSROs not only stabilizes the HEA lattice structure, but also enhances the hardness, elastic modulus, and ideal strength. Comprehensive electronic structure analyses uncover that the reduction of d electrons at the Fermi level due to the development of (Ti, Zr)-based CSROs stabilizes the bcc HEA, and the CSRO-induced strengthening is attributed to the local lattice distortion and the d-electron transfer from high-energy to low-energy states under applied strains. This finding not only gives insight into understanding the nature of CSRO strengthening in bcc HEAs, but also provides a paradigm for achieving desired mechanical properties via tailoring CSROs in HEAs.

关键词： Density of states Elasticity Electronic structure First-principles calculations Structural properties Transition metal alloys Density functional theory Small-angle x-ray scattering

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Optimal verification and fidelity estimation of maximally entangled states

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Physical Review A 2019年第5期99卷 052346-052346页

作者： Huangjun Zhu Masahito Hayashi Department of Physics and Center for Field Theory and Particle Physics Fudan University Shanghai 200433 China State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Graduate School of Mathematics Nagoya University Nagoya 464-8602 Japan Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 117542 Singapore

We study the verification of maximally entangled states by virtue of the simplest measurement settings: local projective measurements without adaption. We show that optimal protocols are in one-to-one correspondence with complex projective 2-designs constructed from orthonormal bases. Optimal protocols with minimal measurement settings are in one-to-one correspondence with complete sets of mutually unbiased bases. Based on this observation, optimal protocols are constructed explicitly for any local dimension, which can also be applied to estimating the fidelity with the target state and to detecting entanglement. In addition, we show that incomplete sets of mutually unbiased bases are optimal for verifying maximally entangled states when the number of measurement settings is restricted. Moreover, we construct optimal protocols for the adversarial scenario in which state preparation is not trusted. The number of tests has the same scaling behavior as the counterpart for the nonadversarial scenario; the overhead is no more than three times. We also show that the entanglement of the maximally entangled state can be certified with any given significance level using only one test as long as the local dimension is large enough.

关键词： Quantum entanglement Quantum tomography

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