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Nonlinear feedback synchronization of hyperchaos in higher dimensional systems

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Nuclear science and techniques 1997年第4期 1-7页

作者： Fang Jin Qing ( China Institute of Atomic Energy, Beijing 102413) Ali m k ( department of Physics, the university of lethbridge,lethbridge, Alberta t1k 3m4, canada)

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关键词： Hyperchaos Synchronization Nonlinear feedback functions ten dimension.

Synchronizing spatiotemporal chaos in the coupled map lattices using nonlinear feedback functions

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Nuclear science and techniques 1997年第3期 1-7页

作者： Fang Jin Qing ( China Institute of Atomic Energy, Beijing 102413) m k Ali △ ( department of Physics, the university of lethbridge,lethbridge, Alberta t1k 3m4, canada)

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ＳｙｎｃｈｒｏｎｉｚｉｎｇｓｐａｔｉｏｔｅｍｐｏｒａｌｃｈａｏｓｉｎｔｈｅｃｏｕｐｌｅｄｍａｐｌａｔｉｃｅｓｕｓｉｎｇｎｏｎｌｉｎｅａｒｆｅｄｂａｃｋｆｕｎｃｔｉｏｎｓＴｈｅｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙｆｕｎｄｉｎｇｔｏＦａｎｇＪｉｎＱｉ...

关键词： Nonlinear feedback functions Synchronization Spatiotemporal chaos Coupled map lattices Noise effect

Cluster based node scheduling method for wireless sensor networks

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science China(Information sciences) 2012年第4期55卷 755-764页

作者： WANG Lei 1,2,WEI RuiZhong 2 & tIAN ZiHong 2,3 1 College of Software,Hunan university,Changsha 410082,China 2 department of computer science,Lakehead university,thunder Bay P7B 5E1,canada 3 mathematics and Information science College,Hebei Normal university,Shijiazhuang 050016,China College of Software Hunan University Changsha China department of computer science Lakehead University Thunder Bay Canada mathematics and Information science College Hebei Normal University Shijiazhuang China

By researching on the node scheduling problem of m-covered and connected sensor networks,a new concept of two-hops-cluster is proposed in this paper,and based on it,a new distributed node scheduling algorithm tHCNS for allocating all nodes in the sensor network into k(k≤m) different groups {0,1,...,k 1} is designed,without requiring location *** algorithm guarantees that each group to be connected and maintains the coverage ratio with high *** analysis and simulation results show that it has better performance than previous randomized scheduling scheme,and can prolong the lifetime of the sensor network effectively.

关键词： node scheduling lifetime wireless sensor network two-hops-cluster

REmARk ON CRItICAL SPEED OF tRAVELING WAVEFRONtS FOR NICHOLSON'S BLOWFLIES EQUAtION WItH DIFFUSION

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Acta mathematica Scientia 2010年第5期30卷 1561-1566页

作者：危地吴教育梅铭 department of Information and Computation Nanchang Hangkong University School of computer Engineering and technology Guangdong Institute of Science and Technology department of mathematics Champlain College Saint-LambertSaint-Lambert department of mathematics and Statistics McGill University

this note is devoted to the son＇s blowflies equation with diffusion, a critical speed of traveling waves, we give behavior with respect to the mature age study on the traveling wavefronts to the Nicholtime-delayed re... 详细信息

关键词： Nicholson's blowflies equation traveling wavefronts critical wave-speed

multifractal modelling and spectrum analysis: methods and applications to gamma ray spectrometer data from southwestern Nova Scotia, canada

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science China Earth sciences 2006年第3期49卷 283-294页

作者： CHENG Qiuming1,2 1. State key Lab.of Geological Processes and mineral Resources, China university of Geosciences, Wuhan 430074, China 2. department of Earth and Space science and Engineering, department of Geography, York university, 4700 keele Street, toronto, Ontario, m3J 1P3, canada State key Lab.of Geological Processes and mineral Resources China University of Geosciences Wuhan China department of Earth and Space science and Engineering Department of Geography York University Toronto Canada

multifractal spectrum, autocorrelation/semivariogram and power spectrum are three dif- ferent functions characterizing a field or measure from different aspects. these functions are interre- lated in such that the autocorrelation/semivariogram and power spectrum are related to the low order statistical moments (0 to 2 nd) which may determine the local multifractality (τ ″(1)) of a multifractal measure. A better understanding of the interrelationships among these three functions is important because, on one hand, the multifractal modelling characterizes a multifractal measure in a more de- tailed manner since it involves moments of all orders. On the other hand, the commonly used semivariogram and power spectrum functions can be used as alternatives to study the dominant mul- tifractal properties around the mean measure. moreover, semivariogram and power-spectrum func- tions provide spatial and spectral information, which is highly valued in geological applications. A new fractal relation found between area and power-spectrum will be useful for investigation of new meth- ods of spatial-spectral analysis for pattern recognition, anomaly separation, classification, etc. these results have been demonstrated with the case study of modelling gamma ray spectrometer data from the mineral district, southwestern Nova Scotia, canada. the results have shown that the values of uranium (U), thorium (th) and potassium (k) may possess monofractal properties whereas the ratios of these values show high multifractality. the values of the ratios U/k and U/th show relatively large variances and may provide more information for distinguishing the distinct phases of the granites, country rocks as well as possible gold mineralization-associated regional hydrothermal alteration zones. In addition, the power spectra for U, th, k, U/th and U/k consistently show two distinct power-law relationships for two ranges of wave number 12≤ω ≤160 km and 0≤ω ≤12 km. these properties might provide usefu

关键词： gamma ray spectrometer data, gold mineralization, alteration zones, multifractal modelling, spectral analysis, GIS.

Asymptotic SEP of mImO beamforming in two-hop AF relaying systems

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science China(Information sciences) 2012年第2期55卷 377-383页

作者： FU YouHua1,HAN YuJie2,YANG LvXi2,ZHU WeiPing3 & LIU Chen1 1School of Electronic science and Engineering,Nanjing university of Posts and telecommunications,Nanjing 210003,China 2School of Information science and Engineering,Southeast university,Nanjing 210096,China 3department of Electrical and computer Engineering,Concordia university,montreal H3G 1m8,canada School of Electronic science and Engineering Nanjing University of Posts and Telecommunications Nanjing China School of Information science and Engineering Southeast University Nanjing China department of Electrical and computer Engineering Concordia University Montreal Canada

this paper derives an asymptotic average symbol error probab.lity(SEP)expression for multiple-input multiple-output(mImO)two-hop amplify-and-forward(AF)relay systems with optimal *** analysis at high signal-to-noise ratio(SNR)quantifies the diversity order and array gain,which are valid for any antenna numbers of the terminals and arbitrary channel fading *** is also proved that the system performance is dominated by the relatively degraded one of the two-hop *** results based on the simple expressions provide valuab.e insights into the performance and practical design considerations of mImO AF networks.

关键词： mImO relay networks optimal beamforming symbol error probab.lity(SEP) diversity order

Accurate determination of the plate model based on CCD images with different orientations

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Chinese science Bulletin 2010年第9期55卷 791-796页

作者： PENG QingYu1,2,3,4 & FAN LiangYan1,2,3,4 1 Joint Lab.ratory for Astrometry, Dynamics and Space science, Jinan university, Guangzhou 510632, China 2 department of computer science, Jinan university, Guangzhou 510632, China 3 key Lab.ratory of Optoelectronic Information and Sensing technologies of Guangdong Higher Educational Institutes, Jinan university, Guangzhou 510632, China 4 Joint Lab.ratory for Optical Astronomy, Chinese Academy of sciences, kunming 650011, China Joint Lab.ratory for Astrometry Dynamics and Space Science Jinan University Guangzhou China department of computer science Jinan University Guangzhou China key Lab.ratory of Optoelectronic Information and Sensing technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou China Joint Lab.ratory for Optical Astronomy Chinese Academy of Sciences Kunming China

the images of the open cluster NGC2168 are taken using the newly-fitted 2k×2k CCD attached to the 1-m telescope at the Yun-nan Observatory with two different orientations. After the catalogue position of a star from UCAC2 is compared with its corresponding measured position, a surprising result shows that a small field of view (ab.ut 7′×7′) exhibits an obvious distortion. Spe-cifically, the polynomial between the standard coordinate (ξ,η) and its corresponding measured one (x,y) for a star in each field of view has significant terms as high as 4th order. Accordingly, the positional measurement accuracy of a bright UCAC2 star can be derived as well as ~7 mas in each direction (60 s of exposure time and near the zenith). this new finding would be important for a CCD image to deliver a highly accurate position in its whole field of view.

关键词： CCD imaging field distortion positional measurement image analysis

△-tame quasi-hereditary algebras

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science China mathematics 2007年第2期50卷 240-252页

作者： Yun-ge XU & Ying-bo ZHANG Faculty of mathematics and computer science, Hubei university, Wuhan 430062, China School of mathematics sciences, Beijing Normal university, Beijing 100875, China Faculty of mathematics and computer science Hubei University Wuhan China School of mathematics sciences Beijing Normal University Beijing China

Let (k, m,H) be an upper triangular bimodule problem. Briistle and Hille showed that the opposite algebra A of the endomorphism algebra of a projective generator P of the matrices category of (k., m, H) is quasi-hereditary, and there is an equivalence between the category of△-good modules of A and mat(k, m). In this note, based on the tame theorem for bimodule problems, we show that if the algebra A associated with an upper triangular bimodule problem is of△-tame representation type, then the category F(△) has the homogeneous property, i.e. almost all modules in F(△) are isomorphic to their Auslander-Reiten translations. moreover, if (k, m,H)is an upper triangular bipartite bimodule problem, then A is of△-tame representation type if and only if F(△) is homogeneous.

关键词： bimodule problem quasi-hereditary algebra △-tameness homogeneity.

Ground-based and additional science support for SmILE

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Earth and Planetary Physics 2024年第1期8卷 275-298页

作者： J.A.Carter m.Dunlop C.Forsyth k.Oksavik E.Donovon A.kavanagh S.E.milan t.Sergienko R.C.Fear D.G.Sibeck m.Connors t.Yeoman X.tan m.G.G.t.taylor k.mcWilliams J.Gjerloev R.Barnes D.D.Billet G.Chisham A.Dimmock m.P.Freeman D.-S.Han m.D.Hartinger S.-Y.W.Hsieh Z.-J.Hu m.k.James L.Juusola k.kauristie E.A.kronberg m.Lester J.manuel J.matzka I.mcCrea Y.miyoshi J.Rae L.Ren F.Sigernes E.Spanswick k.Sterne A.Steuwer t.Sun m.-t.Walach B.Walsh C.Wang J.Weygand J.Wild J.Yan J.Zhang Q.-H.Zhang Planetary sciences Group School of Physics and AstronomyUniversity of LeicesterUniversity RoadLeicesterLE17RHUK Rutherford Appleton Lab.ratory Space Science Technology Facilities CouncilOxfordshireUK School of Space and Environment Beihang UniversityBeijing 100191China key Lab.ratory of Space Environment monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100017China department of Space and Climate Physics UCLMullard Space Science LaboratoryHolmbury St.MaryDorkingSurreyRH56NTUK Birkeland Centre for Space science Department of Physics and Technology.University of BergenBergenNorway department of Physics and Astronomy University of Calgary2500 University DriveCalgaryAlbertaCanada T2N 1N4 British Antarctic Survey CambridgeUK Swedish Institute of Space Physics KirunaSweden West Highfield Campus University of SouthamptonUniversity RoadSO171BJUK Goddard Space Flight Center NASAGreenbeltMarylandUSA Athab.sca university AthabascaCanada EStEC European Space AgencyNetherlands university of Saskatchewan SaskatoonCanada the Johns Hopkins university Applied Physics Lab.ratory LaurelMarylandUSA Swedish Institude of Space Physics UppsalaSE 75121Sweden tongji university Shanghai 200092China Center for Space Plasma Physics Space Science Institute4765 Walnut Street Suite BBoulderColorado80301USA Polar Research Institute of China Shanghai 200136China Finnish meteorological Institute(FmI) Finland department of Earth and Environmental sciences(Geophysics) Ludwig Maximilian University of Munich(LMU)MunichTheresienstr.41MunichD-80333Germany Canadian Space Agency MontrealCanada GFZ German Research Centre for Geosciences PotsdamGermany Nagoya university Institute for Space Earth Environment ResearchCenter for Integrated Data ScienceNagoyaAichiJP 464-8601 Northumbria university Newcastle upon TyneTyne and WearUK NE18ST National Space science Center Chinese Academy SciencesBeijing 100190China Arctic Geophysics University Centre in Svalbard

the joint European Space Agency and Chinese Academy of sciences Solar wind magnetosphere Ionosphere Link Explorer(SmILE)mission will explore global dynamics of the magnetosphere under varying solar wind and interplanetary magnetic field conditions,and simultaneously monitor the auroral response of the Northern Hemisphere *** these large-scale responses with medium and fine-scale measurements at a variety of cadences by additional ground-based and space-based instruments will enab.e a much greater scientific impact beyond the original goals of the SmILE ***,we describe current community efforts to prepare for SmILE,and the benefits and context various experiments that have explicitly expressed support for SmILE can offer.A dedicated group of international scientists representing many different experiment types and geographical locations,the Ground-based and Additional science Working Group,is facilitating these *** include constructing an online SmILE Data Fusion Facility,the discussion of particular or special modes for experiments such as coherent and incoherent scatter radar,and the consideration of particular observing strategies and spacecraft *** anticipate growing interest and community engagement with the SmILE mission,and we welcome novel ideas and insights from the solar-terrestrial community.

关键词： magnetosphere ionosphere magnetosphere-ionosphere coupling ground-based experimentation SmILE conjunctions missions