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State of the climate in 2019 global oceans

Bulletin of the American Meteorological Society 2020年第8期101卷 S129-S184页

作者： Lumpkin, Rick Baringer, Molly Bif, Mariana B. Boyer, Tim Bushinsky, Seth M. Carter, Brendan R. Cetinić, Ivona Chambers, Don P. Cheng, Lijing Chiba, Sanai Dai, Minhan Domingues, Catia M. Dong, Shenfu Fassbender, Andrea J. Feely, Richard A. Frajka-Williams, Eleanor Franz, Bryan A. Gilson, John Goni, Gustavo Hamlington, Benjamin D. Hu, Zeng-Zhen Huang, Boyin Ishii, Masayoshi Jevrejeva, Svetlana Johns, William E. Johnson, Gregory C. Johnson, Kenneth S. Kennedy, John Kersalé, Marion Killick, Rachel E. Landschützer, Peter Lankhorst, Matthias Lee, Tong Leuliette, Eric Li, Feili Lindstrom, Eric Locarnini, Ricardo Lozier, Susan Lyman, John M. Marra, John J. Meinen, Christopher S. Merrifield, Mark A. Mitchum, Gary T. Moat, Ben Monselesan, Didier Nerem, R. Steven Perez, Renellys C. Purkey, Sarah G. Rayner, Darren Reagan, James Rome, Nicholas Sanchez-Franks, Alejandra Schmid, Claudia Scott, Joel P. Send, Uwe Siegel, David A. Smeed, David A. Speich, Sabrina Stackhouse, Paul W. Sweet, William Takeshita, Yuichiro Thompson, Philip R. Triñanes, Joaquin A. Visbeck, Martin Volkov, Denis L. Wanninkhof, Rik Weller, Robert A. Westberry, Toby K. Widlansky, Matthew J. Wijffels, Susan E. Wilber, Anne C. Yu, Lisan Yu, Weidong Zhang, Huai-Min Andersen, Andrea Griffin, Jessicca Hammer, Gregory Love-Brotak, S. Elizabeth Misch, Deborah J. Riddle, Deborah B. Veasey, Sara W. NOAA/OAR Atlantic Oceanographic and Meteorological Laboratory MiamiFL United States Monterey Bay Aquarium Research Institute Moss LandingCA United States NOAA/NESDIS National Centers for Environmental Information Silver SpringMD United States University of Hawai'i at Mānoa HonoluluHI United States Joint Institute for the Study of the Atmosphere and Ocean University of Washington NOAA/OAR Pacific Marine Environmental Laboratory SeattleWA United States NASA Goddard Space Flight Center GreenbeltMD United States Universities Space Research Association ColumbiaMD United States College of Marine Science University of South Florida St. PetersburgFL United States International Center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Japan Agency for Marine-Earth Science and Technology Yokosuka Japan Xiamen University Xiamen China Institute for Marine and Antarctic Studies University of Tasmania Antarctic Climate and Ecosystems Cooperative Research Centre Australian Research Council's Centre of Excellence for Climate System Science HobartTAS Australia NOAA/OAR Pacific Marine Environmental Laboratory SeattleWA United States National Oceanography Centre Southampton United Kingdom Scripps Institution of Oceanography University of California at San Diego San diegoCA United States NASA Jet Propulsion Laboratory PasadenaCA United States NOAA/NCEP Climate Prediction Center College ParkMD United States NOAA/NESDIS National Centers for Environmental Information AshevilleNC United States Department of Atmosphere Ocean and Earth System Modeling Research Meteorological Research Institute Japan Meteorological Agency Tsukuba Japan National Oceanography Centre Liverpool United Kingdom Rosenstiel School of Marine and Atmospheric Science University of Miami MiamiFL United States Met Office Hadley Centre Exeter United Kingdom Cooperative Institute for Marine and Atmospheric Studies University of Miami Miam

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Generating scalable entanglement of ultracold bosons in superlattices through resonant shaking

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Physical Review A 2018年第6期97卷 063620-063620页

作者： Lushuai Cao Xing Deng Qian-Ru Zhu Xiao-Fan Xu Xue-Ting Fang Xiang Gao Peter Schmelcher Zhong-Kun Hu MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics School of Physics Huazhong University of Science and Technology Wuhan 430074 People's Republic of China Institute of Space-based Information System China Academy of Electronics and Information Technology Beijing 100041 People's Republic of China Zentrum für Optische Quantentechnologien Universität Hamburg Luruper Chaussee 149 22761 Hamburg Germany The Hamburg Centre for Ultrafast Imaging Luruper Chaussee 149 22761 Hamburg Germany

Based on a one-dimensional double-well superlattice with a unit filling of ultracold atoms per site, we propose a scheme to generate scalable entangled states in the superlattice through symmetry-protected resonant lattice shaking. Our scheme utilizes periodic lattice modulations with a specific two-body exchange symmetry to entangle two atoms in each unit cell with respect to their orbital degree of freedom, and the complete atomic system in the superlattice becomes a cluster of bipartite entangled atom pairs. To demonstrate this we perform ab initio quantum dynamical simulations using the multilayer multiconfiguration time-dependent Hartree method for mixtures, which accounts for all correlations among the atoms. The proposed clusters of bipartite entanglements manifest as an essential resource for various quantum applications, such as measurement-based quantum computation. The lattice shaking scheme to generate this cluster possesses advantages such as a high scalability, fast processing speed, rich controllability on the target entangled states, and accessibility within current experimental techniques.

关键词： Bose gases Cold gases in optical lattices Entanglement in quantum gases

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ALMAGAL III. Compact source catalog: Fragmentation statistics and physical evolution of the core population

arXiv

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arXiv 2025年

作者： Coletta, A. Molinari, S. Schisano, E. Traficante, A. Elia, D. Benedettini, M. Mininni, C. Soler, J.D. Sánchez-Monge, Á. Schilke, P. Battersby, C. Fuller, G.A. Beuther, H. Zhang, Q. Beltrán, M.T. Jones, B. Klessen, R.S. Walch, S. Fontani, F. Avison, A. Brogan, C.L. Clarke, S.D. Hatchfield, P. Hennebelle, P. Ho, P.T.P. Hunter, T.R. Johnston, K.G. Klaassen, P.D. Koch, P.M. Kuiper, R. Lis, D.C. Liu, T. Lumsden, S.L. Maruccia, Y. Möller, T. Moscadelli, L. Nucara, A. Rigby, A.J. Rygl, K.L.J. Sanhueza, P. van der Tak, F. Wells, M.R.A. Wyrowski, F. De Angelis, F. Liu, S. Ahmadi, A. Bronfman, L. Liu, S.-Y. Su, Y.-N. Tang, Y. Testi, L. Zinnecker, H. Via Fosso del Cavaliere 100 RomaI-00133 Italy Dipartimento di Fisica Sapienza Universita’ di Roma Piazzale Aldo Moro 2 RomeI-00185 Italy Carrer de Can Magrans s/n BarcelonaE-08193 Spain Castelldefels BarcelonaE-08860 Spain Physikalisches Institut der Universität zu Köln Zülpicher Str. 77 KölnD-50937 Germany University of Connecticut Department of Physics 2152 Hillside Road Unit 3046 StorrsCT06269 United States Jodrell Bank Centre for Astrophysics The University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Max Planck Institute for Astronomy Königstuhl 17 Heidelberg69117 Germany Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States INAF-Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 Firenze50125 Italy Universität Heidelberg Zentrum für Astronomie Institut für Theoretische Astrophysik Albert-Ueberle-Str. 2 Heidelberg69120 Germany Universität Heidelberg Interdisziplinäres Zentrum für Wissenschaftliches Rechnen Im Neuenheimer Feld 205 Heidelberg69120 Germany Center for Data and Simulation Science University of Cologne Germany Observatoire de Paris Meudon France Garching bei München Germany SKA Observatory Jodrell Bank Lower Withington MacclesfieldSK11 9FT United Kingdom UK ALMA Regional Centre Node M13 9PL United Kingdom National Radio Astronomy Observatory 520 Edgemont Road CharlottesvilleVA22903 United States Institute of Astronomy and Astrophysics Academia Sinica 11F of ASMAB AS/NTU No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States Université Paris-Saclay Université Paris-Cité CEA CNRS AIM Gif-sur-Yvette91191 France East Asian Observatory 660 N. A’ohoku Hawaii Hilo HI96720 United States School of Engineering and Physical Sciences University of Lincoln Isaac Newton Building Brayford Pool LincolnLN6 7TS United Kingdom UK Astronomy Technol

The physical mechanisms behind the fragmentation of high-mass dense clumps into compact star-forming cores and the properties of these cores are fundamental topics that are heavily investigated in current astrophysical research. The ALMAGAL survey provides the opportunity to study this process at an unprecedented level of detail and statistical significance, featuring high-angular resolution 1.38 mm ALMA observations of 1013 massive dense clumps at various Galactic locations. These clumps cover a wide range of distances (∼ 2 − 8 kpc), masses (∼ 102 − 104 M☉), surface densities (0.1 − 10 g cm−2), and evolutionary stages (luminosity over mass ratio indicator of ∼ 0.05 ☉/M☉). Here, we present the catalog of compact sources obtained with the CuTEx algorithm from continuum images of the full ALMAGAL clump sample combining ACA-7m and 12m ALMA arrays, reaching a uniform high median spatial resolution of ∼ 1400 au (down to ∼ 800 au). We characterize and discuss the revealed fragmentation properties and the photometric and estimated physical parameters of the core population. The ALMAGAL compact source catalog includes 6348 cores detected in 844 clumps (83% of the total), with a number of cores per clump between 1 and 49 (median of 5). The estimated core diameters are mostly within ∼ 800 − 3000 au (median of 1700 au). We assigned core temperatures based on the L/M of the hosting clump, and obtained core masses from 0.002 to 345 M☉ (complete above 0.23 M☉), exhibiting a good correlation with the core radii (M ∝ R2.6). We evaluated the variation in the core mass function (CMF) with evolution as traced by the clump L/M, finding a clear, robust shift and change in slope among CMFs within subsamples at different stages. This finding suggests that the CMF shape is not constant throughout the star formation process, but rather it builds (and flattens) with evolution, with higher core masses reached at later stages. We found that all cores within a clump grow in mass on average with

关键词： Stars

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Radiative Cooling of the Thermally Isolated system in KAGRA Gravitational Wave Telescope

Radiative Cooling of the Thermally Isolated System in KAGRA ...

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10th Asian Conference on Applied Superconductivity and Cryogenics, ACASC 2020, 2nd International Cryogenic Materials Conference in Asia, Asian-ICMC 2020 and CSSJ Joint Conference

作者： Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Aso, Y. Bae, S.-W. Bae, Y.-B. Baiotti, L. Bajpai, R. Barton, M.A. Cannon, K. Capocasa, E. Chan, M.-L. Chen, C.-S. Chen, K.-H. Chen, Y.-R. Chu, H.-Y. Chu, Y.-K. Eguchi, S. Enomoto, Y. Flaminio, R. Fujii, Y. Fukunaga, M. Fukushima, M. Ge, G.-G. Hagiwara, A. Haino, S. Hasegawa, K. Hayakawa, H. Hayama, K. Himemoto, Y. Hiranuma, Y. Hirata, N. Hirose, E. Hong, Z. Hsieh, B.-H. Huang, G.-Z. Huang, P.-W. Huang, Y.-J. Ikenoue, B. Imam, S. Inayoshi, K. Inoue, Y. Ioka, K. Itoh, Y. Izumi, K. Jung, K. Jung, P. Kajita, T. Kamiizumi, M. Kanda, N. Kang, G.-W. Kawaguchi, K. Kawai, N. Kawasaki, T. Kim, C. Kim, J. Kim, W. Kim, Y.-M. Kimura, N. Kita, N. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A.K.H. Kotake, K. Kozakai, C. Kozu, R. Kumar, R. Kume, J. Kuo, C.-M. Kuo, H.-S. Kuroyanagi, S. Kusayanagi, K. Kwak, K. Lee, H.-K. Lee, H.-W. Lee, R.-K. Leonardi, M. Lin, C.-Y. Lin, F.-L. Lin, L.C.-C. Liu, G.-C. Luo, L.-W. Marchio, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyazaki, Y. Miyo, K. Miyoki, S. Morisaki, S. Moriwaki, Y. Nagano, K. Nagano, S. Nakamura, K. Nakano, H. Nakano, M. Nakashima, R. Narikawa, T. Negishi, R. Ni, W.-T. Nishizawa, A. Obuchi, Y. Ogaki, W. Oh, J.J. Oh, S.-H. Ohashi, M. Ohishi, N. Ohkawa, M. Okutomi, K. Oohara, K. Ooi, C.-P. Oshino, S. Pan, K.-C. Pang, H.-F. Park, J. Peiia Arellano, F.E. Pinto, I. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sakuno, Y. Sato, S. Sato, T. Sawada, T. Sekiguchi, T. Sekiguchi, Y. Shibagaki, S. Shimizu, R. Shimoda, T. Shimode, K. Shinkai, H. Shishido, T. Shoda, A. Somiya, K. Son, E.J. Sotani, H. Sugimoto, R. Suzuki, T. Suzuki, T. Tagoshi, H. Takahashi, H. Takahashi, R. Takamori, A. Takano, S. Takeda, H. Takeda, M. Tanaka, H. Tanaka, K. Tanaka, K. Tanaka, T. Tanaka, T. Tanioka, S. Tapia San Martin, E.N. Telada, S. Tomaru, T. Tomigami, Y. 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa-City Chiba277-8582 Japan 1-1 Oho Tsukuba-City Ibaraki305-0801 Japan Earthquake Research Institute University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo113-0032 Japan 238 Higashi-Mozumi Kamioka-cho Hida-City Gifu Pref. Japan 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan 245 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of National Institute for Mathematical Sciences Yuseong-daero 1689 beon-gil 70 Daejeon Yuseong-gu34047 Korea Republic of Graduate School of Science Osaka University 1-1 Machikaneyama-cho Toyonaka-City Osaka560-0043 Japan 1-1 Oho Tsukuba-City Ibaraki305-0801 Japan Institute for Gravitational Research University of Glasgow Kelvin BuildingG12 8QQ United Kingdom Department of Applied Physics Fukuoka University Jonan Nanakuma Fukuoka814-0180 Japan Department of Physics Tamkang University No.151 Yingzhuan Rd. Danshui Dist. New Taipei-City25137 Taiwan Department of Physics Center for High Energy and High Field Physics National Central University No. 300 Zhongda Road Zhongyi District Taiyuan-City320 Taiwan Institute of Astronomy National Tsing Hua University No. 101 Kuang-Fu Road Section 2 Hsinchu30013 Taiwan Department of Physics National Tsing Hua University No. 101 Kuang-Fu Road Section 2 Hsinchu30013 Taiwan Department of Physics National Taiwan Normal University Sceince Campus National Taiwan Normal University Taipei116 Taiwan Univ. Grenoble Alpes Universite Savoie Mont Blanc CNRS IN2P3 AnnecyF-74941 France Department of Astronomy University of Tokyo 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of

Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises caused by the thermal fluctuation. The mirror is suspended with the multi-stage pendulum to isolate any vibration. Therefore, this mirror suspension system has few heat links to reduce vibration injection. Thus, this system is mainly cooled down with thermal radiation. In order to understand the process of radiative cooling of the mirror, we analyzed cooling curve based on mass and specific heat. As a result, it was newly found that a cryogenic part called "cryogenic duct-shield"seems to have large contribution in the beginning of the mirror cooling. This finding will help to design new cooling system for the next generation cryogenic gravitational wave detector. © Published under licence by IOP Publishing Ltd.

关键词： Gravity waves

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A broadband interference structure-based algorithm to continuously estimate the range of a moving ship

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Shengxue Xuebao/Acta Acustica 2018年第2期43卷 163-168页

作者： Ren, Qunyan Piao, Shengchun Guo, Shengming Ma, Li Liao, Tianjun Institute of Acoustics Chinese Academy of Sciences Beijing100190 China Key Laboratory of Underwater Acoustics Environment Chinese Academy of Sciences Beijing100190 China Acoustic Science and Technology Laboratory Harbin Engineering University Harbin150001 China State Key Laboratory of Complex System Simulation Beijing Institute of System Engineering Beijing100101 China

In shallow waters, regular striations can be observed from the broad-band range-frequency spectrogram radiated by a moving ship, whose structure can be interpreted by the waveguide invariant theory and has been applied for sediment geoacoustic inversion and source ranging, etc. We present an algorithm to sequentially estimate the source range by observing the striation geometrical characteristics with an extended Kalman filter. This approach is based on the waveguide invariant theory and has the advantage of no requirement of a prior environmental information and forward sound field calculation. The at-sea ship noise data is tested, and the results are in high agreement with GPS data, besides, this approach is also demonstrated to be robust to initial state values. © 2018 Acta Acustica.

关键词： Kalman filters

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HRPGAN: A GAN-based Model to Generate High-resolution Remote Sensing Images

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IOP Conference Series: Earth and Environmental science 2020年第1期428卷

作者： Hai Sun Ping Wang Yifan Chang Li Qi Hailei Wang Dan Xiao Cheng Zhong Xuelian Wu Wenbo Li Bingyu Sun China Telecom Shanghai Ideal Information Industry (Group) Co. Ltd Shanghai China Department of Airborne Remote Sensing National Disaster Reduction Center of China Beijing China Institute of Technology Innovation Hefei Institute of Physical Science Chinese Academy of Sciences Hefei China The Third Research Institute of the Ministry of Public Security Shanghai China Guizhou Key Laboratory of Economics System Simulation Guizhou University of Finance and Economics Guiyang China Beijing Aerospace Flight Control Center Beijing China Institute of Intelligent Machines Chinese Academy of Sciences Hefei China

Generative adversarial networks (GAN) has been mainly used in the generation of natural images such as MNIST, CIFAR10 as well as Imagenet datasets and achieves satisfying generation results. However, GAN always fails in generating high quality high-resolution remote sensing images because remote sensing images are large in size and have various ground objects. To address this issue, a novel framework called High-Resolution PatchGAN (HRPGAN) is introduced in this paper. The structure of HRPGAN follows PatchGAN, but the batch normalization layers are removed and the ReLU activation is replaced by the SELU activation. In addition, a new loss function consisting of the adversarial loss, perceptual reconstruction loss and regularization loss is used in HRPGAN. Experiment results show that the proposed HRPGAN model generates the more diverse and lifelike images in HR remote sensing generation than Bicubic method and TGAN model.

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Vibrational and structural properties of P2O5 glass: Advances from a combined modeling approach

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Physical Review B 2019年第13期100卷 134309-134309页

作者： N. S. Shcheblanov L. Giacomazzi M. E. Povarnitsyn S. Kohara L. Martin-Samos G. Mountjoy R. J. Newport R. C. Haworth N. Richard N. Ollier Laboratoire des Solides Irradiés CEA-CNRS École polytechnique F-91128 Palaiseau France Materials Research Laboratory University of Nova Gorica Vipavska 11c SI-5270 Ajdovščina Slovenia CNR-IOM/Democritos National Simulation Center Istituto Officina dei Materiali c/o SISSA via Bonomea 265 I-34136 Trieste Italy Joint Institute for High Temperatures RAS 13 Building 2 Izhorskaya Street Moscow 125412 Russia Research Center for Advanced Measurement and Characterization National Institute for Materials Science Hyogo 679-5148 Japan Center for Materials Research by Information Integration Research and Services Division of Materials Data and Integrated System NIMS Ibaraki 305-0047 Japan PRESTO Japan Science and Technology Agency Tokyo 102-0076 Japan School of Physical Sciences University of Kent Canterbury CT2 7NH United Kingdom CEA DAM DIF Bruyères-le-Châtel F-91297 Arpajon Cedex France

We present experimental measurements and ab initio simulations of the crystalline and amorphous phases of P2O5. The calculated Raman, infrared, and vibrational density of states (VDOS) spectra are in excellent agreement with experimental measurements and contain the signatures of all the peculiar local structures of the amorphous phase, namely, bridging and nonbridging (double-bonded or terminal) oxygens and tetrahedral PO4 units associated with Q2, Q3, and Q4 species (Qn denotes the various types of PO4 tetrahedra, with n being the number of bridging oxygen atoms that connect the tetrahedra to the rest of the network). In order to reveal the internal structure of the vibrational spectrum, the characteristics of vibrational modes in different frequency ranges are investigated using a mode-projection approach at different symmetries based on the Td symmetry group. In particular, the VDOS spectrum in the range from ∼600 to 870 cm−1 is dominated by bending (F2b) motions related to bridging oxygen and phosphorus (∼800 cm−1 band) atoms, while the high-frequency doublet zone (∼870–1250 cm−1) is associated mostly with the asymmetric (F2s) and symmetric (A1) stretching modes, and most prominent peak around 1400 cm−1 (exp. 1380 cm−1) is mainly due to asymmetric stretching vibrations supported by double-bonded oxygen atoms. The lower-frequency range below 600 cm−1 is shown to arise from a mixture of bending (E and F2b) and rotation (F1) modes. The scissors bending (E) and rotation (F1) modes are well localized below 600 cm−1, whereas the F2b bending modes spread further into the range ∼600–870 cm−1. The projections of the eigenmodes onto Q2, Q3, and Q4 species yield well-defined contributions at frequencies in striking correspondence with the positions of the Raman and infrared bands.

关键词： Lattice dynamics Amorphous materials Ab initio calculations Monte Carlo methods Raman spectroscopy

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Do the chinese astronomical records dated AD 776 january 12/13 describe an auroral display or a

arXiv

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arXiv 2019年

作者： Stephenson, F. Richard Willis, David M. Hayakawa, Hisashi Ebihara, Yusuke Scott, Christopher J. Wilkinson, Julia Wild, Matthew N. Department of Physics University of Durham DurhamDH1 3LE United Kingdom UK Solar System Data Centre Space Physics and Operations Division RAL Space Science and Technology Facilities Council Rutherford Appleton Laboratory Harwell Oxford Didcot OxfordshireOX11 0QX United Kingdom Centre for Fusion Space and Astrophysics Department of Physics University of Warwick CoventryCV4 7AL United Kingdom Graduate School of Letters Osaka University Toyonaka Osaka Pref.5600043 Japan Research Institute for Sustainable Humanosphere Kyoto University Gokasho Uji6110011 Japan Unit of Synergetic Studies for Space Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto6068306 Japan Department of Meteorology University of Reading ReadingRG6 6BB United Kingdom Zooniverse C/o Astrophysics Department University of Oxford OxfordOX1 3RH United Kingdom

The enhancement of carbon-14 in tree rings around AD 774/775 has generated wide interest in solar activity at that time. The historical auroral records have been examined critically. Of particular interest was the "white vapour" observed in China on AD 776 January 12/13. Both Usoskin et al. (2013, Astron. Astrophys. 55, L3;U13) and Stephenson (2015, Adv. Sp. Res. 55, 1537;S15) interpreted this record as an auroral display. Subsequently, Neuhäuser and Neuhäuser (2015, Astron. Nachr. 336, 225;NN15) proposed five "criteria" for the likeliness of aurorae and on this basis rejected an auroral interpretation. Instead, they interpreted it as a lunar halo, and suggested there were no auroral records as a proxy of solar activity in the interval AD *** consider if their "lunar halo hypothesis" and their auroral criteria could be of use in future researches on historical auroral candidates. We first show a counter-example for the lunar halo hypothesis from a parallel record on 1882 November 17, which was seen as a whitish colour, in the southerly direction, and near the Moon. We then consider NN15's criteria on colour, direction, and sky brightness and investigate other counter-examples from early-modern auroral observations. We also consider the extension of the white vapour in AD 776 according to the distribution of Chinese asterisms, and show that its large extension was inconsistent with the lunar halo hypothesis. Conversely, the streaks of white vapour penetrating the eight Chinese asterisms can be reproduced if we consider auroral-ray structures at altitudes between 97 km and 170 km, along geomagnetic field lines between the L-shells L=1.55 and 1.64. Our investigations show that we should consider candidate auroral records in historical documents not on the basis of the newly suggested a priori criteria by NN15 but on all the available observational evidence. Copyright © 2019, The Authors. All rights reserved.

关键词： Moon

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Application of Topology Analysis in Visualization of 2D Dynamic Vector Fields 7

Application of Topology Analysis in Visualization of 2D Dyna...

引用

2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Li Chao Wu Lingda Zhao Bin Science and Technology on Complex Electronic System Simulation Laboratory Equipment Academy Electronic Equipment Test Center

ISBN: (纸本)9781467399050

Flow is one of the most fundamental physical process in natural *** visualization can give an intuitive view of flow fields and contribute to the observation and analysis of *** flow fields are all dynamic while traditional visualization approaches are not able to reflect the trends of flows or the diversity inside *** on the research of Lagrangian Coherent Structures in Computational Fluid Dynamics,the concept of flow field topology is redefined,two typical 2D dynamic vector fields are selected for topology analysis,and the results are used to optimize the visual effects of geometric *** show that visualization of 2D dynamic vector fields based on topology analysis can extract the coherent structures of flows which are helpful to the comprehension of flow for researchers and description of characteristic difference inside flows.

关键词： flow visualization topology analysis dynamic flow fields vector fields Lagrangian Coherent Structures

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Data-Centered Computing and Implementation in Web Service 7

Data-Centered Computing and Implementation in Web Service

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2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Li Chao Wu Lingda Zhao Bin Science and Technology on Complex Electronic System Simulation Laboratory Equipment Academy Electronic Equipment Test Center

ISBN: (纸本)9781467399050

Parallel computer architectures bring synchronization problem which bog down the *** the speed gap between CPU and memory keeps growing,making data operation more *** some data-intensive applications,there are similar or coincident child operations in parallel threads,which take unnecessary *** effectively exploit parallelization,reduce the price of data operation,the concept of data-centered computing is *** considering the similarity and relations between data and merging them into unions as threads' input,data-centered computing can eliminate data operation redundancy of data-intensive *** implementation in web service proves that data-centered computing can effectively improve performance.

关键词： data-centered web service data vector parallelization

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