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arXiv 2019年

作者： Akiyama, Y. Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Asada, H. Aso, Y. Bae, S. Baiotti, L. Barton, M.A. Cannon, K. Capocasa, E. Chen, C.-S. Chiu, T.-W. Cho, K. Chu, Y.-K. Craig, K. Dattilo, V. Doi, K. Enomoto, Y. Flaminio, R. Fujii, Y. Fujimoto, M.-K. Fukunaga, M. Fukushima, M. Furuhata, T. Haino, S. Hasegawa, K. Hashimoto, Y. Hashino, K. Hayama, K. Hirayama, T. Hirose, E. Hsieh, B.H. Huang, C.-Z. Ikenoue, B. Inoue, Y. Ioka, K. Itoh, Y. Izumi, K. Kaji, T. Kajita, T. Kakizaki, M. Kamiizumi, M. Kanbara, S. Kanda, N. Kanemura, S. Kang, G. Kasuya, J. Kawai, N. Kawasaki, T. Kim, C. Kim, W.S. Kim, J. Kim, J.C. Kimura, N. Kirii, S. Kitaoka, Y. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A. Kotake, K. Kozu, R. Kumar, R. Kuo, H.-S. Kuroki, S. Kuroyanagi, S. Lee, H.K. Lee, H.M. Lee, H.W. Leonardi, M. Lin, C.-Y. Lin, F.-L. Liu, G.C. Marchio, M. Matsui, T. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyoki, S. Morii, W. Morisaki, S. Moriwaki, Y. Musha, M. Nagano, S. Nagano, K. Nakamura, K. Nakamura, T. Nakano, H. Nakano, M. Narikawa, T. Quynh, L. Nguyen Ni, W.-T. Nishizawa, A. Obuchi, Y. Oh, J. Oh, S.H. Ohashi, M. Ohishi, N. Ohkawa, M. Okutomi, K. Ono, K. Oohara, K. Ooi, C.P. Pan, S.-S. Paoletti, F. Park, J. Passaquieti, R. Peña Arellano, F.E. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sasai, M. Sato, S. Sato, T. Sekiguchi, T. Sekiguchi, Y. Shibata, M. Shimoda, T. Shinkai, H. Shishido, T. Shoda, A. Someya, N. Somiya, K. Son, E.J. Suemasa, A. Suzuki, T. Suzuki, T. Tagoshi, H. Tahara, H. Takahashi, H. Takahashi, R. Takeda, H. Tanaka, H. Tanaka, K. Tanaka, T. Tanioka, S. San Martin, E.N. Tapia Tomaru, T. Tomura, T. Travasso, F. Tsubono, K. Tsuchida, S. Uchikata, N. Uchiyama, T. Uehara, T. Ueno, K. Uraguchi, F. Ushiba, T. van Putten, M.H.P.M. Vocca, H. Wakamatsu, T. Watanabe, Y. Xu, W.-R. Yamada, T. Yamamoto, K. Yamamoto, K. Yamamoto, S. Yamamoto, T. Yokogawa, K. Yokoyama, J. Yokozawa, T. Yoshioka, T. Yuzurihara, H. Zeidler, S. Zhu, Z.-H. Graduate School of Science and Engineering Hosei University TokyoKoganei184-8584 Japan National Astronomical Observatory of Japan TokyoMitaka181-8588 Japan Department of Physics University of Tokyo TokyoBunkyo113-0033 Japan University of Tokyo KashiwaChiba277-8582 Japan High Energy Accelerator Research Organization TsukubaIbaraki305-0801 Japan Earthquake Research Institute University of Tokyo TokyoBunkyo113-0032 Japan Department of Physics University of Tokyo TokyoBunkyo113-0033 Japan Department of Mathematics and Physics Hirosaki University AomoriHirosaki036-8561 Japan National Astronomical Observatory of Japan GifuHida506-1205 Japan Korea Institute of Science and Technology Information Yuseong Daejeon34141 Korea Republic of Department of Physics Osaka University ToyonakaOsaka560-0043 Japan University of Tokyo TokyoBunkyo113-0033 Japan Department of Physics National Taiwan Normal University Taipei116 Taiwan Department of Physics Sogang University Seoul121-742 Korea Republic of PisaCascinaI-56021 Italy Department of Physics University of Toyama ToyamaToyama930-8555 Japan Department of Astronomy University of Tokyo TokyoBunkyo113-0032 Japan Advanced Technology Center National Astronomical Observatory of Japan TokyoMitaka181-8588 Japan Institute of Physics Academia Sinica TaipeiNankang11529 Taiwan Department of Applied Physics Fukuoka University FukuokaJonan814-0180 Japan Yukawa Institute for Theoretical Physics Kyoto University KyotoSakyo606-8502 Japan Graduate School of Science Osaka City University OsakaSumiyosi558-8585 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency SagamiharaKanagawa252-5210 Japan University of Tokyo GifuHida506-1205 Japan Graduate Schoool of Science and Technology Tokyo Institute of Technology MeguroTokyo152-8551 Japan Department of Physics Ewha Womans University SeoulSeodaemun-gu03760 Korea Republic of National Institute for

A vibration isolation system called Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics. Copyright © 2019, The Authors. All rights reserved.

关键词： Mirrors

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The MUSCLES treasury survey. V. FUV flares on active and inactive M Dwarfs

arXiv

引用

arXiv 2018年

作者： Loyd, R.O. Parke France, Kevin Youngblood, Allison Schneider, Christian Brown, Alexander Hu, Renyu Segura, Antígona Linsky, Jeffrey Redfield, Seth Tian, Feng Rugheimer, Sarah Miguel, Yamila Froning, Cynthia S. School of Earth and Space Exploration Arizona State University TempeAZ85287 United States Laboratory for Atmospheric and Space Physics BoulderCO80309 United States Goddard Space Flight Center GreenbeltMD20771 United States Hamburger Sternwarte Gojenbergsweg 112 Hamburg21029 Germany Keplerlaan 1 AZNoordwijk2201 Netherlands Center for Astrophysics and Space Astronomy University of Colorado 389 UCB BoulderCO80309 United States Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States Division of Geological and Planetary Sciences California Institute of Technology PasadenaCA91125 United States NASA Astrobiology Institute Virtual Planetary Laboratory Box 351580 U.W. SeattleWA98195 United States Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Mexico JILA University of Colorado and NIST 440 UCB BoulderCO80309 United States Astronomy Department and Van Vleck Observatory Wesleyan University MiddletownCT06459 United States Department of Earth System Science Tsinghua University Beijing100084 China Centre for Exoplanet Science University of St. Andrews School of Earth and Environmental Sciences Irvine Building North Street St. AndrewsKY16 9AL United Kingdom Harvard Smithsonian Center for Astrophysics 60 Garden Street CambridgeMA02138 United States Carl Sagan Institute Department of Astronomy Cornell University IthacaNY14853 United States Leiden Observatory LeidenNL-2333 CA Netherlands Department of Astronomy/McDonald Observatory C1400 University of Texas at Austin AustinTX78712 United States

M dwarf stars are known for their vigorous aring. This aring could impact the climate of orbiting planets, making it important to characterize M dwarf ares at the short wavelengths that drive atmospheric chemistry and escape. We conducted a far-ultraviolet are survey of 6 M dwarfs from the recent MUSCLES (Measurements of the Ultraviolet Spectral Characteristics of Low-mass Exoplanetary systems) observations, as well as 4 highly-active M dwarfs with archival data. When comparing absolute are energies, we found the active-M-star ares to be about 10× more energetic than inactive-M-star ares. However, when are energies were normalized by the star's quiescent ux, the active and inactive samples exhibited identical are distributions, with a power-law index of -0:76+0:1-0:09(cumulative distribution). The rate and distribution of ares are such that they could dominate the FUV energy budget of M dwarfs, assuming the same distribution holds to ares as energetic as those cataloged by Kepler and ground-based surveys. We used the observed events to create an idealized model are with realistic spectral and temporal energy budgets to be used in photochemical simulations of exoplanet atmospheres. Applied to our own simulation of direct photolysis by photons alone (no particles), we find the most energetic observed ares have little effect on an Earth-like atmosphere, photolyzing ∼0.01% of the total O3column. The observations were too limited temporally (73 h cumulative exposure) to catch rare, highly energetic ares. Those that the power-law fit predicts occur monthly would photolyze ∼1% of the O3column and those it predicts occur yearly would photolyze the full O3column. Whether such energetic ares occur at the rate predicted is an open question. Copyright © 2018, The Authors. All rights reserved.

关键词： Surveys

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space-charge effect of the time-varying electron injection in a diode: classical and relativistic regimes

arXiv

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arXiv 2017年

作者： Liu, Yangjié Tang, Qi Wu, Biyi Faculty of Physics and Electronic Science Hubei University Hubei Collaboration Innovation Centre for Advanced Organic Chemical Materials Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices WuhanHubei Province430062 China Antennas Group School of Electrical Engineering and Computer Science Queen Mary University of London E1 4NS Mile End East London United Kingdom Department of Mathematical Sciences Rensselaer Polytechnic Institute United States Center for Electromagnetic Simulation Beijing Institute of Technology Haidian District Beijing China

Conventionally, space-charge (SC) limited current density is defined as the maximal current density allowed to traverse a diode under a DC voltage when a time-invariant flow is injected from the cathode. In this work, we study the SC limited current density under a time-varying injection for both classical and relativistic regimes and determine the maximal amount of limited current density under certain conditions. Our simulations show that it is unlikely that a time-varying injection emitted from cathode exceeds the known SC limits, in either classical or relativistic regime. Copyright © 2017, The Authors. All rights reserved.

关键词： Current density

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Corrigendum to “Retrieving forest canopy clumping index using terrestrial laser scanning data” [Remote Sens. Environ. 210 (2018) 452–472]

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Remote Sensing of Environment 2018年 211卷 472-472页

作者： Lixia Ma Guang Zheng Xiaofei Wang Shiming Li Yi Lin Weimin Ju International Institute for Earth System Science Nanjing University Nanjing 210023 China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology and Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023 China Collaborative Innovation Center of South China Sea Studies Nanjing University Nanjing 210023 China Institute of Forest Resource and Information Techniques Chinese Academy of Forestry Beijing 100091 China School of Earth and Space Sciences Peking University Beijing 100871 China

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State of the climate in 2018

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Bulletin of the American Meteorological Society 2019年第9期100卷 SI-S305页

作者： Ades, M. Adler, R. Aldeco, Laura S. Alejandra, G. Alfaro, Eric J. Aliaga-Nestares, Vannia Allan, Richard P. Allan, Rob Alves, Lincoln M. Amador, Jorge A. Andersen, J.K. Anderson, John Arndt, Derek S. Arosio, C. Arrigo, Kevin Azorin-Molina, César Bardin, M. Yu Barichivich, Jonathan Barreira, Sandra Baxter, Stephen Beck, H.E. Becker, Andreas Bell, Gerald D. Bellouin, Nicolas Belmont, M. Benedetti, Angela Benedict, Imme Bernhard, G.H. Berrisford, Paul Berry, David I. Bettio, Lynette Bhatt, U.S. Biskaborn, B.K. Bissolli, Peter Bjella, Kevin L. Bjerke, J.K. Blake, Eric S. Blenkinsop, Stephen Blunden, Jessica Bock, Olivier Bosilovich, Michael G. Boucher, Olivier Box, J.E. Boyer, Tim Braathen, Geir Bringas, Francis G. Bromwich, David H. Brown, Alrick Brown, R. Brown, Timothy J. Buehler, S.A. Cáceres, Luis Calderón, Blanca Camargo, Suzana J. Campbell, Jayaka D. Campos Diaz, Diego A. Cappelen, J. Carrea, Laura Carrier, Seth B. Carter, Brendan R. Castro, Anabel Y. Cetinic, Ivona Chambers, Don P. Chen, Lin Cheng, Lijing Cheng, Vincent Y. S. Christiansen, Hanne H. Christy, John R. Chung, E.-S. Claus, Federico Clem, Kyle R. Coelho, Caio A. S. Coldewey-Egbers, Melanie Colwell, Steve Cooper, Owen R. Cosca, Cathy Covey, Curt Coy, Lawrence Dávila, Cristina P. Davis, Sean M. de Eyto, Elvira de Jeu, Richard A. M. De Laat, Jos Decharme, B. Degasperi, Curtis L. Degenstein, Doug Demircan, Mesut Derksen, C. Dhurmea, K.R. Di Girolamo, Larry Diamond, Howard J. Diaz, Eliecer Diniz, Fransisco A. Dlugokencky, Ed J. Dohan, Kathleen Dokulil, Martin T. Dolman, A. Johannes Domingues, Catia M. Domingues, Ricardo Donat, Markus G. Dorigo, Wouter A. Drozdov, D.S. Druckenmiller, Matthew L. Dunn, Robert J. H. Durre, Imke Dutton, Geoff S. Elkharrim, M. Elkins, James W. Epstein, H.E. Espinoza, Jhan C. Famiglietti, James S. Farrell, Sinead L. Fausto, R.S. Feely, Richard A. Feng, Z. Fenimore, Chris Fettweis, X. Fioletov, Vitali E. Flemming, Johannes Fogt, Ryan L. Forbes, B.C. Foster, Michael J. Francis, S.D. Franz, Bryan A. Frey, Richard A. Frith, Stacey European Centre for Medium-Range Weather Forecasts Reading United Kingdom University of Maryland College ParkMD United States Servicio Meteorológico Nacional Buenos Aires Argentina Instituto Geofísico del Perú Lima Peru Center for Geophysical Research and School of Physics University of Costa Rica San José Costa Rica Servisâo Nacional de Meteorología e Hidrología del Perú Lima Peru University of Reading Reading United Kingdom Met Office Hadley Centre Exeter United Kingdom Centro de Ciencias do Sistema Terrestre Instituto Nacional de Pesquisas Espaciais Cachoeira PaulistaSao Paulo Brazil Geological Survey of Denmark and Greenland Copenhagen Denmark Department of Atmospheric and Planetary Science Hampton University HamptonVA United States NOAA/NESDIS National Centers for Environmental Information AshevilleNC United States University of Bremen Bremen Germany Department of Earth System Science Stanford University StanfordCA United States Regional Climate Group Department of Earth Sciences University of Gothenburg Gothenburg Sweden Centro de Investigaciones sobre Desertificación – Spanish National Research Council MoncadaValencia Spain Yu. A. Izrael Institute of Global Climate and Ecology and Institute of Geography Russian Academy of Sciences Russia Instituto de Geografía Pontificia Universidad Católica de Valparaíso Valparaíso Chile Argentine Naval Hydrographic Service Buenos Aires Argentina NOAA/NWS Climate Prediction Center College ParkMD United States Department of Civil and Environmental Engineering Princeton University PrincetonNJ United States Global Precipitation Climatology Centre Deutscher Wetterdienst Offenbach am Main Germany Seychelles National Meteorological Services Pointe Larue MahéSeychelles India Meteorology and Air Quality Group Wageningen University and Research Wageningen Netherlands Biospherical Instruments Inc San DiegoCA United States NCAS-Climate European Centre for Medium-Range Weather Forecasts Reading United Kingdom

In 2018, the dominant greenhouse gases released into Earth's atmosphere-carbon dioxide, methane, and nitrous oxide-continued their increase. The annual global average carbon dioxide concentration at Earth's surface was 407.4 ± 0.1 ppm, the highest in the modern instrumental record and in ice core records dating back 800 000 years. Combined, greenhouse gases and several halogenated gases contribute just over 3 W m−2 to radiative forcing and represent a nearly 43% increase since 1990. Carbon dioxide is responsible for about 65% of this radiative forcing. With a weak La Niña in early 2018 transitioning to a weak El Niño by the year's end, the global surface (land and ocean) temperature was the fourth highest on record, with only 2015 through 2017 being warmer. Several European countries reported record high annual temperatures. There were also more high, and fewer low, temperature extremes than in nearly all of the 68-year extremes record. Madagascar recorded a record daily temperature of 40.5°C in Morondava in March, while South Korea set its record high of 41.0°C in August in Hongcheon. Nawabshah, Pakistan, recorded its highest temperature of 50.2°C, which may be a new daily world record for April. Globally, the annual lower troposphere temperature was third to seventh highest, depending on the dataset analyzed. The lower stratospheric temperature was approximately fifth lowest. The 2018 Arctic land surface temperature was 1.2°C above the 1981-2010 average, tying for third highest in the 118-year record, following 2016 and 2017. June's Arctic snow cover extent was almost half of what it was 35 years ago. Across Greenland, however, regional summer temperatures were generally below or near average. Additionally, a satellite survey of 47 glaciers in Greenland indicated a net increase in area for the first time since records began in 1999. Increasing permafrost temperatures were reported at most observation sites in the Arctic, with the overall increase of 0.1°-0.2°C bet

关键词： Greenhouse gases

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Fast direct solution of 3-D dynamic electromagnetic problems by method of moments

Fast direct solution of 3-D dynamic electromagnetic problems...

引用

Antennas and Propagation Society International Symposium

作者： Yan-Nan Liu Ming-Ming Xu Xiao-Min Pan Xin-Qing Sheng Cong-Jun Jin Center for Electromagnetic Simulation Beijing Institute of Technology Beijing China Science and Technology on Space System Simulation Laboratory Beijing China

The direct solver based on skeletonization consists of two stages: selecting skeletons and computing the inverse matrix. The selection of skeletons can be expensive although Huygens' principle is employed to avoid filling in the complete impedance matrix. A fast matrix filling strategy is proposed to alleviate the difficulty by making use of Taylor series. Numerical experiments indicate the proposed method can significantly accelerate the matrix filling process with no loss in accuracy.

关键词： Skeleton Method of moments Taylor series Electromagnetics Impedance Matrix decomposition Integral equations

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First demonstration of ionization cooling by the Muon Ionization Cooling Experiment

arXiv

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arXiv 2019年

作者： Bogomilov, M. Tsenov, R. Vankova-Kirilova, G. Song, Y.P. Tang, J.Y. Li, Z.H. Bertoni, R. Bonesini, M. Chignoli, F. Mazza, R. Palladino, V. De Bari, A. Orestano, D. Tortora, L. Kuno, Y. Sakamoto, H. Sato, A. Ishimoto, S. Chung, M. Sung, C.K. Filthaut, F. Jokovic, D. Maletic, D. Savic, M. Jovancevic, N. Nikolov, J. Vretenar, M. Ramberger, S. Asfandiyarov, R. Blondel, A. Drielsma, F. Karadzhov, Y. Charnley, G. Collomb, N. Dumbell, K. Gallagher, A. Grant, A. Griffiths, S. Hartnett, T. Martlew, B. Moss, A. Muir, A. Mullacrane, I. Oates, A. Owens, P. Stokes, G. Warburton, P. White, C. Adams, D. Bayliss, V. Boehm, J. Bradshaw, T.W. Brown, C. Courthold, M. Govans, J. Hills, M. Lagrange, J.-B. Macwaters, C. Nichols, A. Preece, R. Ricciardi, S. Rogers, C. Stanley, T. Tarrant, J. Tucker, M. Watson, S. Wilson, A. Bayes, R. Nugent, J.C. Soler, F.J.P. Gamet, R. Cooke, P. Blackmore, V.J. Colling, D. Dobbs, A. Dornan, P. Franchini, P. Hunt, C. Jurj, P.B. Kurup, A. Long, K. Martyniak, J. Middleton, S. Pasternak, J. Uchida, M.A. Cobb, J.H. Booth, C.N. Hodgson, P. Langlands, J. Overton, E. Pec, V. Smith, P.J. Wilbur, S. Chatzitheodoridis, G.T. Dick, A.J. Ronald, K. Whyte, C.G. Young, A.R. Boyd, S. Greis, J.R. Lord, T. Pidcott, C. Taylor, I. Ellis, M. Gardener, R.B.S. Kyberd, P. Nebrensky, J.J. Palmer, M. Witte, H. Adey, D. Bross, A.D. Bowring, D. Hanlet, P. Liu, A. Neuffer, D. Popovic, M. Rubinov, P. DeMello, A. Gourlay, S. Lambert, A. Li, D. Luo, T. Prestemon, S. Virostek, S. Freemire, B. Kaplan, D.M. Mohayai, T.A. Rajaram, D. Snopok, P. Torun, Y. Cremaldi, L.M. Sanders, D.A. Summers, D.J. Coney, L.R. Hanson, G.G. Heidt, C. Department of Atomic Physics St. Kliment Ohridski University of Sofia Sofia Bulgaria Institute of High Energy Physics Chinese Academy of Sciences Beijing China Sichuan University China Sezione INFN Milano Bicocca Dipartimento di Fisica G. Occhialini Milano Italy Sezione INFN Napoli Dipartimento di Fisica Università Federico II Complesso Universitario di Monte S. Angelo Napoli Italy Sezione INFN Pavia Dipartimento di Fisica Pavia Italy INFN Sezione di Roma Tre Dipartimento di Matematica e Fisica Università Roma Tre Italy Osaka University Graduate School of Science Department of Physics Toyonaka Osaka Japan Institute of Particle and Nuclear Studies Tsukuba Ibaraki Japan UNIST Ulsan Korea Republic of Nikhef Amsterdam Netherlands Institute of Physics University of Belgrade Serbia Faculty of Sciences University of Novi Sad Serbia CERN Esplanade des Particules 1 P.O. Box 1211 Geneva 23 Switzerland RIKEN 2-1 Horosawa Wako Saitama351-0198 Japan Radboud University Nijmegen Netherlands Brunel University UxbridgeUB8 3PH United Kingdom ATC Royal Observatory Edinburgh Blackford Hill EdinburghEH9 3HJ United Kingdom Laurentian University 935 Ramsey Lake Road SudburyON Canada OPERA Simulation Software Network House Langford Locks Kidlington OxfordshireOX5 1LH United Kingdom CERN Esplanade des Particules 1 P.O. Box Geneva 231211 Switzerland School of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Rutherford Building Cavendish Laboratory JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Arm City Gate 8 St Mary's Gate SheffieldS1 4LW United Kingdom School of Physics and Astronomy Kelvin Building University of Glasgow Glasgow United Kingdom Cockcroft Institute Daresbury Laboratory Sci-Tech Daresbury Daresbury WarringtonWA4 4AD United Kingdom Department of Physics and Astronomy University of Sheffield Sheffield United Kingdom Defence Science and Technology Laboratory SalisburySP4 0JQ Un

High-brightness muon beams of energy comparable to those produced by state-of-the-art electron, proton and ion accelerators have yet to be realised. Such beams have the potential to carry the search for new phenomena in lepton-antilepton collisions to extremely high energy and also to provide uniquely well-characterised neutrino beams. A muon beam may be created through the decay of pions produced in the interaction of a proton beam with a target. To produce a high-brightness beam from such a source requires that the phase space volume occupied by the muons be reduced (cooled). Ionization cooling is the novel technique by which it is proposed to cool the beam. The Muon Ionization Cooling Experiment collaboration has constructed a section of an ionization cooling cell and used it to provide the first demonstration of ionization cooling. We present these ground-breaking measurements. Copyright © 2019, The Authors. All rights reserved.

关键词： Phase space methods

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On scattering centers of cone-shaped targets in bistatic mode

On scattering centers of cone-shaped targets in bistatic mod...

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Antennas and Propagation Society International Symposium

作者： Quan-You Qu Kun-Yi Guo Xin-Qing Sheng Jing Ma Bin Shi Cong-Jun Jin Center for Electromagnetic Simulation Beijing Institute of Techonology Beijing China Science and Technology on Space System Simulation Laboratory Beijing China

ISBN: (纸本)9781479978168

The scattering centers induced by creeping waves on cone-shaped targets are studied. Because of separated transmitters and receivers, the scattering centers could be observed in bistatic mode, especially under situation of large bistatic angles. Although induced by the same scattering mechanism, i.e., creeping waves, scattering centers on different profiles of cone-shaped targets have distinguished attributes. Attributes of scattering centers have been analyzed theoretically based on geometrical theory of diffraction, and investigated numerically by time-frequency representation of scattered signals.

关键词： Diffraction Time-frequency analysis Antennas Electromagnetic scattering Receivers Radar

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Reusable planning and scheduling tool for SPPSS: Public Operation Service 14th

Reusable planning and scheduling tool for SPPSS: Public Oper...

引用

14th International Conference on space Operations, spaceOps 2016

作者： Li, Dalin Gu, Yanfeng Bai, Meng Yang, Binbin Wu, Hai Yan Harbin Institute of Technology Harbin150001 China National Space Science Center CAS Beijing100190 China Beihang University Beijing100191 China Key Laboratory of Integrated Avionics and Information Technology for Complex Aerospace System No.1 Nanertiao Zhonguancun Haidian district Beijing China School of Electronic and Information Engineering No.92 Xidazhijie Nangang district Harbin China Satellite Mission Operation Laboratory No.1 Nanertiao Zhonguancun Haidian district Beijing China School of Software No.37 Xueyuanlu Haidian district Beijing China

ISBN: (数字)9781624104268

ISBN: (纸本)9781624104268

The Strategic Pioneer Program on space science (SPPSS) was approved by Chinese Academy of sciences on January 2011. The first satellite in the program, Dark Matter Particle Explorer, was launched on December 2015. Public Operation Service system is designed to provide scheduling and planning services for all the satellite missions related to SPPSS. The system requirements are analyzed, and the layout of it is detailed introduced in this paper. Then the performance of the system is concluded at the end. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Scheduling

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The Evolution of Cities: “Brains” or “Parasites” of Sustainable Production and Consumption Processes in China

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Energy Procedia 2016年 88卷 218-223页

作者： Gengyuan Liu Steve-Wonder Amakpah Zhifeng Yang Bin Chen Yan Hao Sergio Ulgiati State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Beijing Engineering Research Center for Watershed Environmental Restoration & Integrated Ecological Regulation Beijing 100875 China Department of Science and Technology Parthenope University of Naples Centro Direzionale Isola C4 80143 Naples Italy

In the last two decades, remarkable progress in the promotion and implementation in China has occurred and generated a huge change of land use, energy and other resources demand, as well as environmental problems. It is therefore of paramount importance to explore the driving forces and the consequences of such a trend, as far as environmental integrity and resource availability are concerned. Special focus must be placed to possible changes in driving forces, in order to understand to what extent such a trend is continuous and irreversible or, instead, if sustainable metabolic processes in cities are likely to slow down as a consequence of the expected decline of available energy and material resources. Previous studies have already recognized the importance of the energy and material basis in support to urbanization trends and expressed concerns about the environmental consequences resulted from urbanization. What is missing is an integrated approach capable of establishing a bridge across the three legs of urban sustainability: (i) economic viability; (ii) social desirability; and (iii) ecological compatibility. This paper describes the development of a forecasting model, named the thermodynamic-based urban dynamic model, capable of accurately simulating the observed resource consumption, economic growth, and environmental impact of Dalian from 2000 to 2050. This model differs from previous urban dynamic models by monitoring the negative effects to human well-being and ecosystem integrity in the developing urban systems. Statistical information and calibration were also considered in this dynamic accounting. The results showed that the production and consumption processes in Dalian are heavily relied on non-renewable resources. Although the economic structure of Dalian was generally optimized, Dalian continued to face enormous resource and environmental pressures caused by the rapid economic growth. This study advances the temporal dynamic principles through inte

关键词： Urban metabolism Ecological Wisdom system dynamics Environmental impacts

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