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On the system of High Order Rational Difference Equations

International scholarly research notices 2014年第1期2014卷 760502页

作者： Qianhong Zhang Wenzhuan Zhang Yuanfu Shao Jingzhong Liu Guizhou Key Laboratory of Economics System Simulation Guizhou University of Finance and Economics Guiyang Guizhou 550004 China. School of Science Guilin University of Technology Guilin Guangxi 541000 China. Department of Mathematics and Physics Hunan Institute of Technology Hengyang Hunan 421002 China.

This paper is concerned with the boundedness, persistence, and global asymptotic behavior of positive solution for a system of two rational difference equations x n+1 = A + (x n /∑ i=1 (k) y n-i ), y n+1 = B + (y n /∑ i=1 (k) x n-i ), n = 0,1,…, k ∈ {1,2,…}, where A, B ∈ (0, ∞), x -i ∈ (0, ∞), and y -i ∈ (0, ∞), i = 0,1, 2,…, k.

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A multi-wavelength Brillouin Er-doped fiber laser based on tunable fiber loop mirror filter

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2013年第5期24卷 874-877页

作者： Yuan, Shan Wang, Tian-Shu Miao, Xue-Feng Zhou, Xue-Fang Wei, Yi-Zhen Li, Qi-Liang Sun, Ling-Ling College of Communication Engineering Hangzhou Dianzi University Hangzhou Zhejiang 310018 China Key Laboratory of RF Circuits and System of Ministry of Education Huangzhou Dianzi University Hangzhou Zhejiang 310018 China Space Photoelectric Technology Institute Changchun University of Science and Technology Changchun Jilin 130022 China

In this paper, a novel linear multi-wavelength Brillouin erbium-doped fiber laser (EDFL) is demonstrated. We utilize a nonlinear amplified fiber loop mirror filter (AFLMF). The nonlinear amplified fiber loop mirror filter consists of erbium-doped fiber amplifier (EDFA) with a segment of erbium-doped fiber pumped by 980 nm laser diode, a polarization controller (PC) and an optical coupler. The nonlinear AFLMF induces wavelength-dependent cavity loss and it can provide flexibility on controlling the amount of light reflected and transmitted into and out of the laser's cavity. At the Brillouin pump power of 25 mW and the 980 nm pump power of 200 mW, 14 output channels with 0.08 nm spacing and tuning range of 50 nm from 1 530 nm to 1 580 nm are achieved. And we realize the tunable output of multi-wavelength through adjusting the 980 nm pump power, the polarization controller and the Brillouin pump wavelength. In addition, the effects of both 980 nm pump power and PC on the wavenumber of Stokes light are studied.

关键词： Fiber lasers

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Correction: Corrigendum: Continental-scale temperature variability during the past two millennia

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Nature Geoscience 2015年第12期8卷 981-982页

作者： Moinuddin Ahmed Kevin J. Anchukaitis Brendan M. Buckley Edward R. Cook Jason E. Smerdon Asfawossen Asrat Mohammed Umer Hemant P. Borgaonkar Martina Braida Barbara Stenni Ulf Büntgen Raphael Neukom Brian M. Chase Duncan A. Christie Antonio Lara Mark A. J. Curran Andrew D. Moy Tas van Ommen Henry F. Diaz Jan Esper Ze-Xin Fan Narayan P. Gaire Quansheng Ge Xuemei Shao Joëlle Gergis J Fidel González-Rouco Hugues Goosse Stefan W. Grab David J. Nash Nicholas Graham Rochelle Graham Martin Grosjean Heinz Wanner Sami T. Hanhijärvi Atte A. Korhola Darrell S. Kaufman Nicholas P. McKay Thorsten Kiefer Lucien von Gunten Katsuhiko Kimura Paul J. Krusic Anne-Marie Lézine Fredrik C. Ljungqvist Andrew M. Lorrey Jürg Luterbacher Johannes P. Werner Valérie Masson-Delmotte Danny McCarroll Maria R. Prieto Joseph R. McConnell Michael Sigl Mariano S. Morales Ignacio A. Mundo Ricardo Villalba Robert Mulvaney Takeshi Nakatsuka Masaki Sano Sharon E. Nicholson Hans Oerter Jonathan G. Palmer Steven J. Phipps Chris S.M. Turney Andres Rivera Mirko Severi Timothy M. Shanahan Feng Shi Olga N. Solomina Eric J. Steig Meloth Thamban Valerie Trouet Dirk Verschuren Andre E. Viau Bo M. Vinther Sebastian Wagner Eduardo Zorita Eugene R. Wahl James W.C. White Koh Yasue Department of Botany Federal Urdu University of Arts Science and Technology Karachi 75300 Pakistan Lamont Doherty Earth Observatory Columbia University Palisades 10964 New York USA Woods Hole Oceanographic Institution Woods Hole 2543 Massachusetts USA School of Earth Sciences Addis Ababa University Addis Ababa Ethiopia Indian Institute of Tropical Meteorology Pune 411008 India Dipartimento di Matematica e Geoscienze University of Trieste 34128 Italy Swiss Federal Research Institute WSL Birmensdorf 8903 Switzerland Département Paléoenvironnements et Paléoclimats (PAL) Université Montpellier Montpellier 34095 France Department of Archaeology History Cultural Studies and Religion University of Bergen Bergen 5020 Norway Laboratorio de Dendrocronología y Cambio Global Universidad Austral de Chile Casilla 567 Valdivia Chile Center for Climate and Resilience Research Universidad de Chile Casilla 2777 Santiago Chile Australian Antarctic Division Kingston 7050 Tasmania Australia Antarctic Climate & Ecosystems Cooperative Research Centre University of Tasmania Sandy Bay 7005 Tasmania Australia Cooperative Institute for Research in Environmental Sciences National Oceanic and Atmospheric Administration Boulder 80305 Colorado USA Department of Geography Johannes Gutenberg University Mainz 55099 Germany Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Yunnan 666303 China Faculty of Science Nepal Academy of Science and Technology Khumaltar GPO Box 3323 Lalitpur Nepal Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China School of Earth Sciences University of Melbourne Melbourne 3010 Victoria Australia Departamento Astrofísica y CC de la Atmósfera Universidad Complutense de Madrid Madrid 28040 Spain Lemaitre Center for Earth and Climate Research Earth and Life Institute Université catholique de Louvain Louvain-la-Neuve 1348 Belgium School of Geography Archaeolog

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Lateral jet force model identification based on FCM-SVM

Lateral jet force model identification based on FCM-SVM

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2011 International Conference on Electrical, Information Engineering and Mechatronics, EIEM 2011

作者： Liu, Xiaofeng Dong, Yunfeng Wang, Xiaolei School of Astronautics Beijing University of Aeronautics and Astronautics Beijing China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing China

ISBN: (纸本)9781447124665

To describe the lateral jet force model accurately, an identification method based on FCM-SVM is provided. The experimental data is clustered with this method to gain the best partition and separating hyperplanes. Different classes are identified respectively using maximum-likelihood estimation method. The test data is classified through separating hyperplanes. The output of test data can be forecasted according to the expression of corresponding class. Result shows that the precision is increased by 31% compared with traditional identification model. The identification result based on FCM-SVM can supply support for the design of control system. © 2012 Springer-Verlag London Limited.

关键词： Geometry

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Scientific rationale for Saturn's in situ exploration

Scientific rationale for Saturn's in situ exploration

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作者： Mousis, O. Fletcher, L.N. Lebreton, J.-P. Wurz, P. Cavalié, T. Coustenis, A. Courtin, R. Gautier, D. Helled, R. Irwin, P.G.J. Morse, A.D. Nettelmann, N. Marty, B. Rousselot, P. Venot, O. Atkinson, D.H. Waite, J.H. Reh, K.R. Simon, A.A. Atreya, S. André, N. Blanc, M. Daglis, I.A. Fischer, G. Geppert, W.D. Guillot, T. Hedman, M.M. Hueso, R. Lellouch, E. Lunine, J.I. Murray, C.D. O'Donoghue, J. Rengel, M. Sánchez-Lavega, A. Schmider, F.-X. Spiga, A. Spilker, T. Petit, J.-M. Tiscareno, M.S. Ali-Dib, M. Altwegg, K. Bolton, S.J. Bouquet, A. Briois, C. Fouchet, T. Guerlet, S. Kostiuk, T. Lebleu, D. Moreno, R. Orton, G.S. Poncy, J. Université de Franche-Comté Institut UTINAM CNRS/INSU France Department of Physics University of Oxford Clarendon Laboratory Parks Road OxfordOX1 3PU United Kingdom LPC2E CNRS-Université d'Orléans 3a Avenue de la Recherche Scientifique Orléans Cedex 245071 France LESIA UPMC Univ. Paris-Diderot 5 place Jules Janssen Meudon cedexF-92195 France Space Science and Planetology Physics Institute University of Bern Sidlerstrasse 5 Bern3012 Switzerland Max-Planck-Institut für Sonnensystemforschung Justus-von-Liebig-Weg 3 Göttingen37077 Germany Department of Geophysics Atmospheric and Planetary Sciences Tel-Aviv University Tel-Aviv Israel Planetary and Space Sciences Department of Physics Open University Milton KeynesMK7 6AA United Kingdom Institute for Physics University of Rostock Rostock18051 Germany CRPG-CNRS Nancy-Université 15 rue Notre Dame des Pauvres Vandoeuvre-ls-Nancy54501 France Instituut voor Sterrenkunde Katholieke Universiteit Leuven Celestijnenlaan 200D Leuven3001 Belgium Department of Electrical and Computer Engineering University of Idaho MoscowID83844-1023 United States 6220 Culebra Road San AntonioTX78228 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States NASA Goddard Space Flight Center Code 690 GreenbeltMD20771 United States Department of Atmospheric Oceanic and Space Sciences University of Michigan Ann ArborMI48109-2143 United States 9 avenue du Colonel Roche Toulouse Cedex 431028 France University of Athens Department of Physics Panepistimioupoli Zografou Athens15784 Greece Space Research Institute Austrian Academy of Sciences Schmiedlstrasse 6 GrazA-8042 Austria Stockholm University Astrobiology Centre Department of Physics Stockholm University/Stockholms Universitet Roslagstullbacken 21 StockholmS-10691 Sweden Observatoire de la Côte d'Azur Laboratoire Lagrange BP 4229 Nice cedex 406304 France Department of Physics U

Remote sensing observations meet some limitations when used to study the bulk atmospheric composition of the giant planets of our solar system. A remarkable example of the superiority of in situ probe measurements is illustrated by the exploration of Jupiter, where key measurements such as the determination of the noble gases' abundances and the precise measurement of the helium mixing ratio have only been made available through in situ measurements by the Galileo probe. This paper describes the main scientific goals to be addressed by the future in situ exploration of Saturn placing the Galileo probe exploration of Jupiter in a broader context and before the future probe exploration of the more remote ice giants. In situ exploration of Saturn's atmosphere addresses two broad themes that are discussed throughout this paper: first, the formation history of our solar system and second, the processes at play in planetary atmospheres. In this context, we detail the reasons why measurements of Saturn's bulk elemental and isotopic composition would place important constraints on the volatile reservoirs in the protosolar nebula. We also show that the in situ measurement of CO (or any other disequilibrium species that is depleted by reaction with water) in Saturn's upper troposphere may help constraining its bulk O/H ratio. We compare predictions of Jupiter and Saturn's bulk compositions from different formation scenarios, and highlight the key measurements required to distinguish competing theories to shed light on giant planet formation as a common process in planetary systems with potential applications to most extrasolar systems. In situ measurements of Saturn's stratospheric and tropospheric dynamics, chemistry and cloud-forming processes will provide access to phenomena unreachable to remote sensing studies. Different mission architectures are envisaged, which would benefit from strong international collaborations, all based on an entry probe that would descend throug

关键词： Probes

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Low-frequency Periodic Error Identification and Compensation for Star Tracker Attitude Measurement

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Chinese Journal of Aeronautics 2012年第4期25卷 615-621页

作者： WANG Jiongqi XIONG Kai ZHOU Haiyin Department of Mathematics and System Science National University of Defense Technology Changsha 410073 China National Laboratory of Space Intelligent Control Beijing 100048 China

The low-frequency periodic error of star tracker is one of the most critical problems for high-accuracy satellite attitude *** this paper an approach is proposed to identify and compensate the low-frequency periodic error for star tracker in attitude *** analytical expression between the estimated gyro drift and the low-frequency periodic error of star tracker is derived *** then the low-frequency periodic error,which can be expressed by Fourier series,is identified by the frequency spectrum of the estimated gyro drift according to the solution of the first ***,the compensated model of the low-frequency periodic error is established based on the identified parameters to improve the attitude determination ***,promising simulated experimental results demonstrate the validity and effectiveness of the proposed *** periodic error for attitude determination is eliminated basically and the estimation precision is improved greatly.

关键词： star trackers attitude determination low-frequency periodic error gyro drift precision analysis

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Dipolarization Observed by TC1 and Cluster During Substorm in Sep. 14, 2004

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Chinese Journal of Geophysics 2013年第4期50卷 866-876页

作者： Xin CAO Zu-Yin PU Hui ZHANG Sui-Yan FU Zhi-Wei MA Chi-Jie XIAO Zhen-Xing LIU Lun XIE M. W Dunlop A Korth M. Frazen Q. G ZONG E. Lueck C. Carr H. Reme K. H Glassmeier School of Earth and Space Science Peking University Beijing 100871 China Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230026 China The National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Space Science and Technology Department Rutherford Appleton Laboratory UK Max-Planck-Institute for Solar System Research Germany CSP Boston University US The Blackett Laboratory Imperial College London UK CNSR France IGM TU Braunschweig Germany

We study the substorm dipolarization occurring from 1730 to 1930 UT on Sep 14, 2004 based on DSP/TC1, Cluster and Polar data, combined with the aurora and geosynchronous energetic particle measurements and ground-based magnetic field observations. During this time period the IMF was continuously southward. Substorm onset started at about 1822 UT. Three minute later at 1825 UT TC1, which was located at (–10, –2, 0) R E (GSE) in the near-Earth tail, saw a sharp decrease of magnetic B X component, accompanied by sudden increases in both the ion temperature and thermal pressure. Two minutes further later, energetic electron injection was observed by LANL-02A in the pre-midnight sector at geostationary orbit. About 23 minutes later at 1850 UT, the same signatures as observed by TC1 were observed by Cluster at (–16, 1, 3) R E (GSE) in the mid-tail. Meanwhile, POLAR, which was located much higher and more close to the Earth at (–7.5, 3.5, –4.0) R E (GSE), saw a sudden change in the elevation of the magnetic field at about 1855UT. Aforementioned time sequence of substorm activities indicates that the expansion onset took place at about 1822UT and TC1 and Cluster observed dipolarization (tail expansion) 3 and 28 minutes later, respectively. This means that tail expansion was propagated from source region in the near-Earth tail to the mid-tail. Detailed calculations imply that the source of the dipolarization was situated at about X = −(8.5 − 8.7) R E and the tailward progression speed was about (70~82) km·s -1 . A substorm paradigm is proposed to explain the observations in this substorm event: Earthward flow produced by magnetic reconnection in the mid-tail creates favorable conditions for substorm initiation in the near-Earth; after the expansion onset the dipolarization front propagates down to the tail.

关键词： Dipolarization Substorm Near Earth reconnection Continues lobe reconnection Pi2

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Observation of multiple sub-cavities adjacent to single separatrix

Observation of multiple sub-cavities adjacent to single sepa...

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2013中国极地科学学术年会

作者： Rongsheng Wang Andrew N.Fazakedey Aimin Du Rumi Nakamura Quanming Lu Yuri V.Khotyaintsev Martin Volwerk Tielong Zhang E.A.Kronberg P.W.Daly Space Research Institute Austrian Academy of Sciences Graz 8042 Austria Department of Geophysics and Planetary Science University of Science and Technology of China Hefei 230026 China Key Laboratory of Ionospheric Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Mullard Space Science Laboratory Surrey UK Max Planck Institute for Solar System Research Katlenburg-Lindau Germany Swedish Institute of Space Physics U ppsala Sweden

We investigate a direct south-north crossing of a reconnection ion diffusion region in the *** this crossing, multiple electron density dips with a further density decrease within the cavity, called sub-cavities, adjacent to the northern separatrix are *** correlation between electron density sub-cavities and strong electric field fluctuations is *** one of the sub-cavities, a series of very strong oscillating perpendicular electric field and patchy parallel electric field are *** parallel electric field is nearly unipolar and directs away from *** the same region, inflow electrons with energy up to 100keV are injected into the *** on the observations, we conclude that the high energy inflowing electrons are accelerated by the patchy parallel electric ***, electrons have been effectively accelerated while they are flowing into the X-line along the *** observations indicate that electron acceleration region is widely larger than the predicted electron diffusion region in the classical Hall magnetic reconnection model.

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system of systems complexity and decision making

System of systems complexity and decision making

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2012 7th International Conference on system of systems Engineering, SoSE 2012

作者： Zhang, Yingchao Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781467329750

Complexity in system of systems (SoS) is a key factor in SoS decision making. This paper analyzes the main characteristics of SoS, especially its complexity in terms of monolithic emergence, component systems adaption and uncertainty in SoS evolution. It further discusses the effects of SoS complexity on SoS decision making. In light of SoS complexity, the paper figures out the major problems that need to be addressed in four areas, namely SoS adaption, abnormity analysis in SoS evolution, exploratory analysis of SoS capability and SoS simulation. In conclusion the paper proposes a preliminary SoS decision making model based on the analysis of SoS adaption. © 2012 IEEE.

关键词： system of systems

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Application of high frequency scattering predication method in MMWSS

Application of high frequency scattering predication method ...

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2012 International Conference on Microwave and Millimeter Wave technology, ICMMT 2012

作者： Nie, J.K. Guo, L.X. Zhao, H. Ma, J. Fei, J.D. School of Science Xidian University Xi'an Shaanxi 710071 China Key Laboratory on Space System Simulation Beijing Simulation Center Beijing 100854 China

ISBN: (纸本)9781467321839

A radiation model of millimeter wave antenna is established in this paper. The electromagnetic field distribution on the seeker antenna is calculated in MMWSS based on PO method. According the numerical results, when target is in the near-field of antenna, the characteristic of echo amplitude has an obvious effect of multi-scattering points effect. © 2012 IEEE.

关键词： Millimeter waves

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