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Permanence and global asymptotic stability of a predator-prey model with Holling type II functional response

ICIC Express Letters 2014年第10期8卷 2739-2744页

作者： Xu, Changjin Wu, Yusen Lu, Lin Guizhou Key Laboratory of Economics System Simulation School of Mathematics and Statistics Guizhou University of Finance and Economics Huaxi District Guiyang 550025 China School of Mathematics and Statistics Henan University of Science and Technology No. 263 Kaiyuan Road Luoyang 471023 China

In this paper, a predator-prey model with Holling type II functional response is investigated. By using the differential inequality theory, some sufficient conditions are derived for the permanence and global asymptotic stability of the system. The paper ends with some interesting numerical simulations that illustrate our analytical predictions. © 2014 ICIC International.

关键词： Predator prey systems

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Permanence and asymptotically periodic solution of a variable-territory predator-prey system

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ICIC Express Letters 2015年第1期9卷 275-281页

作者： Xu, Changjin Wu, Yusen Lu, Lin Guizhou Key Laboratory of Economics System Simulation Guizhou University of Finance and Economics No. 276 Luchongguan Road Yunyan District Guiyang China School of Mathematics and Statistics Guizhou University of Finance and Economics No. 276 Luchongguan Road Yunyan District Guiyang China School of Mathematics and Statistics Henan University of Science and Technology No. 263 Kaiyuan Road Luoyang China

This paper is concerned with a variable-territory predator-prey system. By using the differential inequality theory, some sufficient conditions are obtained for the permanence of the system. By constructing a suitable Liapunov function, we obtain that the system has a unique asymptotically periodic solution which is globally asymptotically stable. The paper ends with a brief conclusion.

关键词： Predator prey systems

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Optimization of thermal emittance tuneability of La (Sr, Ca)Mn03 thin-film materials in 173-373 K

Optimization of thermal emittance tuneability of La (Sr, Ca)...

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2nd International Congress on Advanced Materials, AM 2013

作者： Chunhua, Wir Jiawen, Qiu Min, Xir Jiebing, Wang Huaping, Zuo Baisen, Zhang Lin, Li Yinzhong, Zhao Science and Technology on Surface Engineering Laboratory Lanzhou Institute of Physics Lanzhou 730000 China Institute of Spacecraft System China Academy of Space Technology Beijing 100094 China

ISBN: (纸本)9783037858295

For the purpose of maximizing the thermal emittance variation of La (Sr. Ca) M11O3 thin films in the temperature range 173-373 K. thin film optical mechanism and mathematical optimization method were used to determine the thin film structure, including substrate type, thin film chemical composition and the optimized film thickness. The optimization results indicate the variation amplitude of La (Sr. Ca) film infrared emittance reaches to 0.62. which is 35% more than that of ceramic type smart radiation materials. The designed thin film structure can be used to enhance the thermal control efficiency of spacecraft greatly. ©2014 Trans Tech Publications Ltd, Switzerland.

关键词： Thin films

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Dynamic anti-windup design for anticipatory activation:enlargement of the domain of attraction

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science China(Information sciences) 2014年第1期57卷 164-177页

作者： WU XiongJun LIN Zongli Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China The 802 Institute of Shanghai Academy of Space Flight Technology The Eighth Academy of China Aerospace Science and Technology Corporation Charles L. Brown Department of Electrical and Computer Engineering University of Virginia

Traditional anti-windup compensators are designed for activation immediately at the occurrence of actuator ***,anti-windup compensators were designed for actuation either after the saturation has reached a certain level or in anticipation of its *** the case of static anti-windup compensators,it has been shown that an anti-windup compensator designed for activation in anticipation of actuator saturation would lead to better performance than those designed for immediate or delayed activation could,both in terms of transient performance and the size of the domain of *** recently,it has been shown that a dynamic anti-windup compensator designed for anticipatory activation would also result in better transient performance than those designed for immediate or delayed activation *** this paper,we design dynamic anti-windup compensators for the enlargement of the domain of *** compensators are designed respectively for immediate,delayed and anticipatory *** will show by simulation that a dynamic anti-windup compensator designed for anticipatory activation would result in a larger domain of attraction than a dynamic anti-windup compensator designed for immediate or delayed activation could.

关键词： actuator saturation anti-windup anticipatory activation domain of attraction dynamic com-pensator

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High-resolution imaging of transiting extrasolar planetary systems (HITEP).

arXiv

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arXiv 2017年

作者： Evans, D.F. Southworth, J. Smalley, B. Jørgensen, U.G. Dominik, M. Andersen, M.I. Bozza, V. Bramich, D.M. Burgdorf, M.J. Ciceri, S. D’Ago, G. Jaimes, R. Figuera Gu, S.-H. Hinse, T.C. Henning, T.H. Hundertmark, M. Kains, N. Kerins, E. Korhonen, H. Kokotanekova, R. Kuffmeier, M. Longa-Peña, P. Mancini, L. MacKenzie, J. Popovas, A. Rabus, M. Rahvar, S. Sajadian, S. Snodgrass, C. Skottfelt, J. Surdej, J. Tronsgaard, R. Unda-Sanzana, E. von Essen, C. Wang, Yi-Bo Wertz, O. Astrophysics Group Keele University StaffordshireST5 5BG United Kingdom Niels Bohr Institute Centre for Star and Planet Formation University of Copenhagen Øster Voldgade 5 Copenhagen1350 - Denmark Centre for Exoplanet Science SUPA School of Physics & Astronomy University of St Andrews North Haugh St AndrewsKY16 9SS Dark Cosmology Centre Niels Bohr Institute University of Copenhagen Juliane Maries Vej 30 Copenhagen ØDK-2100 Dipartimento di Fisica "E.R. Caianiello" Università di Salerno Via Giovanni Paolo II 132 Fisciano84084 Italy Istituto Nazionale di Fisica Nucleare Sezione di Napoli Napoli Italy Universität Hamburg Faculty of Mathematics Informatics and Natural Sciences Department of Earth Sciences Meteorological Institute Bundesstraße 55 Hamburg20146 Germany Max Planck Institute for Astronomy Königstuhl 17 Heidelberg69117 Germany INAF-Osservatorio Astronomico di Capodimonte Salita Moiariello 16 Napoli80131 Italy European Southern Observatory Karl-Schwarzschild Straße 2 Garching bei München85748 Germany Yunnan Observatories Chinese Academy of Sciences Kunming650011 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming650011 China Korea Astronomy & Space Science Institute 776 Daedukdae-ro Yuseong-gu Daejeon305-348 Astronomisches Rechen-Institut Zentrum für Astronomie der Universität Heidelberg Mönchhofstr. 12-14 Heidelberg69120 Germany Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 Jodrell Bank Centre for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Väisäläntie 20 PiikkiöFI-21500 Finland Max Planck Institute for Solar System Research Justus-von-LiebigWeg 3 Göttingen37077 Germany School of Physical Sciences Faculty of Science Technology Engineering and Mathematics Open University Walton Hall Milton KeynesMK7 6AA United Kingdom Unidad de Astronomía Fac. de Ciencias Básicas

Context. The formation and dynamical history of hot Jupiters is currently debated, with wide stellar binaries having been suggested as a potential formation pathway. Additionally, contaminating light from both binary companions and unassociated stars can significantly bias the results of planet characterisation studies, but can be corrected for if the properties of the contaminating star are known. Aims. We search for binary companions to known transiting exoplanet host stars, in order to determine the multiplicity properties of hot Jupiter host stars. We also search for and characterise unassociated stars along the line of sight, allowing photometric and spectroscopic observations of the planetary system to be corrected for contaminating light. Methods. We analyse lucky imaging observations of 97 Southern hemisphere exoplanet host stars, using the Two Colour Instrument on the Danish 1.54m telescope. For each detected companion star, we determine flux ratios relative to the planet host star in two passbands, and measure the relative position of the companion. The probability of each companion being physically associated was determined using our two-colour photometry. Results. A catalogue of close companion stars is presented, including flux ratios, position measurements, and estimated companion star temperature. For companions that are potential binary companions, we review archival and catalogue data for further evidence. For WASP-77AB and WASP-85AB, we combine our data with historical measurements to determine the binary orbits, showing them to be moderately eccentric and inclined to the line of sight (and hence planetary orbital axis). Combining our survey with the similar Friends of Hot Jupiters survey, we conclude that known hot Jupiter host stars show a deficit of high mass stellar companions compared to the field star population;however, this may be a result of the biases in detection and target selection by ground-based surveys. Copyright © 2017, The Authors

关键词： Extrasolar planets

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Underlying scaling relationships between solar activity and geomagnetic activity revealed by multifractal analyses

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Journal of Geophysical Research: space Physics 2014年第9期119卷 7577-7586页

作者： Yu, Zu-Guo Anh, Vo Eastes, Richard Hunan Key Laboratory for Computation and Simulation in Science and Engineering Ministry of Education Xiangtan University Xiangtan Hunan China School of Mathematical Sciences Queensland University of Technology Brisbane QLD Australia Florida Space Institute University of Central Florida Orlando FL United States

This paper identifies some scaling relationships between solar activity and geomagnetic activity. We examine the scaling properties of hourly data for two geomagnetic indices (a_p and AE), two solar indices (solar X-rays X_l and solar flux F10.7), and two inner heliospheric indices (ion density Ni and flow speed Vs) over the period 1995-2001 by the universal multifractal approach and the traditional multifractal analysis. We found that the universal multifractal model (UMM) provides a good fit to the empirical K(q) and τ(q) curves of these time series. The estimated values of the Lévy index α in the UMM indicate that multifractality exists in the time series for a_p, AE, X_l, and Ni, while those for F10.7 and Vs are monofractal. The estimated values of the nonconservation parameter H of this model confirm that these time series are conservative which indicate that the mean value of the process is constant for varying resolution. Additionally, the multifractal K(q) and τ(q) curves, and the estimated values of the sparseness parameter C₁ of the UMM indicate that there are three pairs of indices displaying similar scaling properties, namely a_p and X_l, AE and Ni, and F10.7 and Vs. The similarity in the scaling properties of pairs (a_p,X_l) and (AE,Ni) suggests that a_p and X_l, AE and Ni are better correlated - in terms of scaling - than previous thought, respectively. But our results still cannot be used to advance forecasting of a_p and AE by X_l and Ni, respectively, due to some reasons. Key Points The scaling properties of the geomagnetic and the solar indices are examinedThe results suggest that multifractality exists in a_p, AE, Xl, and ion densityThe scaling similarity of the a_p and Xl data suggests flare-storm dependence ©2014. American Geophysical Union. All Rights Reserved.

关键词： geomagnetic indices multifractal analysis scaling property solar indices universal multifractal model

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Indoor visual navigation system based on paired-landmark for small UAVs

Indoor visual navigation system based on paired-landmark for...

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IEEE International Conference on Robotics and Biomimetics

作者： Tianmiao Wang Yicheng Zhang Chaolei Wang Jianhong Liang Han Gao Miao Liu Qinpu Guan Anqi Sun BeiHang University Beijing China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing China Beihang University Beijing CN

ISBN: (纸本)9781479973989

This paper has presented an implementation of visual based non-GNSS navigation method for small VTOL (Vertically Taking-off and Landing) UAV (Unmanned Aerial Vehicle). A novel method of constructing landmarks is described in detail. It uses a pair of landmarks instead of the general landmark which usually is a single geometry or coding image. The paired-landmark method inherits general landmark methods' advantages of low-cost, high-efficiency and the ability of absolute positioning. And it also solves the problem of requiring too much different characteristic landmarks when handling large area navigation. The paired-landmark method has been verified by a real parameter simulation environment. Real flight experiment is also carried out to test the effectiveness and performance of the paired-landmark navigation method. It can be concluded that, besides achieved the expected positioning precision, the proposed system also reduced the consumption of calculation and memory space.

关键词： Cameras Aircraft Aircraft navigation Visualization Atmospheric modeling Estimation

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Erratum to: Intercomparison of the Arctic sea ice cover in global ocean–sea ice reanalyses from the ORA-IP project

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Climate Dynamics 2016年第3期49卷 1137-1138页

作者： Matthieu Chevallier Gregory C. Smith Frédéric Dupont Jean-François Lemieux Gael Forget Yosuke Fujii Fabrice Hernandez Rym Msadek K. Andrew Peterson Andrea Storto Takahiro Toyoda Maria Valdivieso Guillaume Vernieres Hao Zuo Magdalena Balmaseda You-Soon Chang Nicolas Ferry Gilles Garric Keith Haines Sarah Keeley Robin M. Kovach Tsurane Kuragano Simona Masina Yongming Tang Hiroyuki Tsujino Xiaochun Wang Centre National de Recherches Météorologiques (CNRM) Météo France/CNRS UMR3589 Toulouse France Recherche en Prévision Numérique Environnementale Environnement et Changement Climatique Canada Dorval Canada Service Météorologique du Canada Environnement et Changement Climatique Canada Dorval Canada Massachusetts Institute of Technology Cambridge USA Meteorological Research Institute (MRI) Japan Meteorological Agency Tsukuba Japan Mercator Océan Ramonville-Saint-Agne France Institut de Recherche pour le Développement (IRD) Toulouse France NOAA Geophysical Fluid Dynamics Laboratory (GFDL) Princeton USA Centre Européen de Recherche et de Formation Avancée au Calcul Scientifique (CERFACS) Toulouse France Met Office Hadley Centre Exeter UK Euro-Mediterranean Centre for Climate Change Bologna Italy National Centre for Earth Observation (NCEO) University of Reading Reading UK Science Systems and Applications Inc. Lanham USA Global Modelling and Assimilation Office NASA Goddard Space Flight Center (GSFC) Greenbelt USA European Centre for Medium-Range Weather Forecasts (ECMWF) Reading UK Department of Earth Science Education Kongju National University Kongju South Korea National Institute for Geophysics and Volcanology Bologna Italy Joint Institute for Regional Earth System Science and Engineering UCLA Los Angeles USA

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Gauge and Higgs bosons

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Chinese Physics C 2016年第10期40卷 601-632页

作者： C.Patrignani K.Agashe G.Aielli C.Amsler M.Antonelli D.M.Asner H.Baer Sw.Banerjee R.M.Barnett T.Basaglia C.W.Bauer J.J.Beatty V.I.Belousov J.Beringer S.Bethke H.Bichsel O.Biebel E.Blucher G.Brooijmans O.Buchmueller V.Burkert M.A.Bychkov R.N.Cahn M.Carena A.Ceccucci A.Cerri D.Chakraborty M.-C.Chen R.S.Chivukula K.Copic G.Cowan O.Dahl G.D'Ambrosio T.Damour D.de Florian A.de Gouvea T.DeGrand P.de Jong G.Dissertori B.A.Dobrescu M.D'Onofrio M.Doser M.Drees H.K.Dreiner D.A.Dwyer P.Eerola S.Eidelman J.Ellis J.Erler V.V.Ezhela W.Fetscher B.D.Fields B.Foster A.Freitas H.Gallagher L.Garren H.-J.Gerber G.Gerbier T.Gershon T.Gherghetta A.A.Godizov M.Goodman C.Grab A.V.Gritsan C.Grojean D.E.Groom M.Grnewald A.Gurtu T.Gutsche H.E.Haber K.Hagiwara C.Hanhart S.Hashimoto Y.Hayato K.G.Hayes A.Hebecker B.Heltsley J.J.Hernandez-Rey K.Hikasa J.Hisano A.Hcker J.Holder A.Holtkamp J.Huston T.Hyodo K.Irwin J.D.Jackson K.F.Johnson M.Kado M.Karliner U.F.Katz S.R.Klein E.Klempt R.V.Kowalewski F.Krauss M.Kreps B.Krusche Yu.V.Kuyanov Y.Kwon O.Lahav J.Laiho P.Langacker A.Liddle Z.Ligeti C.-J.Lin C.Lippmann T.M.Liss L.Littenberg K.S.Lugovsky S.B.Lugovsky A.Lusiani Y.Makida F.Maltoni T.Mannel A.V.Manohar W.J.Marciano A.D.Martin A.Masoni J.Matthews U.-G.Meiβner D.Milstead R.E.Mitchell P.Molaro K.Mnig F.Moortgat M.J.Mortonson H.Murayama K.Nakamura M.Narain P.Nason S.Navas M.Neubert P.Nevski Y.Nir K.A.Olive S.Pagan Griso J.Parsons J.A.Peacock M.Pennington S.T.Petcov V.A.Petrov A.Piepke A.Pomarol A.Quadt S.Raby J.Rademacker G.Raffelt B.N.Ratcliff P.Richardson A.Ringwald S.Roesler S.Rolli A.Romaniouk L.J.Rosenberg J.L.Rosner G.Rybka R.A.Ryutin C.T.Sachrajda Y.Sakai G.P.Salam S.Sarkar F.Sauli O.Schneider K.Scholberg A.J.Schwartz D.Scott V.Sharma S.R.Sharpe T.Shutt M.Silari T.Sjstrand P.Skands T.Skwarnicki J.G.Smith G.F.Smoot S.Spanier H.Spieler C.Spiering A.Stahl S.L.Stone Y.Sumino T.Sumiyoshi M.J.Syphers F.Takahashi M.Tanabashi K.Terashi J.Terning R.S.Thorne L.Tiator M.Titov N.P.Tkachenko N.A.Trnqvist D.Tovey G.Valencia R.Van de Water N.Varelas G Particle Data Group Universita di Bologna and INFN Dip.Scienze per la Qualita della Vita University of Maryland Department of Physics College Park Universit degli Studi di Roma "Tor Vergata" Albert Einstein Center for Fundamental Physics Universitt Bern Stefan Meyer Institute for Subatomic Physics Austrian Academy of Sciences Lab.Nazionali di Frascati dell'INFN Pacific Northwest National Laboratory Department of Physics and Astronomy University of Oklahoma University of Louisville Physics Division Lawrence Berkeley National Laboratory CERN European Organization for Nuclear Research Department of Physics The Ohio State University COMPAS Group Institute for High Energy Physics Max-Planck-Institute of Physics Department of Physics University of Washington Ludwig-Maximilians-Universitt Fakultt fr Physik Enrico Fermi Institute and Department of Physics University of Chicago Department of Physics Columbia University High Energy Physics Group Blackett Laboratory Imperial College Jefferson Lab Department of Physics University of Virginia Fermi National Accelerator Laboratory Kavli Institute for Cosmological Physics University of Chicago Department of Physics and Astronomy University of Sussex Department of Physics Northern Illinois University Department of Physics and Astronomy University of California Michigan State University Dept.of Physics and Astronomy Department of Physics Royal Holloway University of London INFN-Sezione di Napoli Complesso Universitario Monte Sant'Angelo Institut des Hautes Etudes Scientifiques International Center for Advanced Studies(ICAS) UNSAM Department of Physics and Astronomy Northwestern University Department of Physics University of Colorado at Boulder Nikhef P.O.Box 41882 1009 DB Amsterdam and University of Amsterdam Institute for Particle Physics ETH Zurich University of Liverpool Department of Physics Oliver Lodge Lab Physikalisches Institut Universitt Bonn Helsinki Institute of Physics University of Helsinki Department of Physics Budker Institute of Nuclear Physics SB RAS Novosib

The Review summarizes much of particle physics and *** data from previous editions,plus 3,062 new measurements from 721 papers,we list,evaluate,and average measured properties of gauge bosons and the recently discovered Higgs boson,leptons,quarks,mesons,and *** summarize searches for hypothetical particles such as supersymmetric particles,heavy bosons,axions,dark photons,*** the particle properties and search limits are listed in Summary *** also give numerous tables,figures,formulae,and reviews of topics such as Higgs Boson Physics,Supersymmetry,Grand Unified Theories,Neutrino Mixing,Dark Energy,Dark Matter,Cosmology,Particle Detectors,Colliders,Probability and *** the 117 reviews are many that are new or heavily revised,including new reviews on Pentaquarks and Inflation.

关键词： Gauge and Higgs bosons Rev

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Astrophysics and Cosmology

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Chinese Physics C 2016年第10期40卷 349-428页

关键词： Astrophysics and Cosmology

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