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Covarying modes of the Pacific SST and northern hemispheric midlatitude atmospheric circulation anomalies during winter

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Progress in Natural science:Materials International 2008年第10期18卷 1261-1270页

作者： Yimin Zhu~(a,b,*) Xiuqun Yang~a Qian Xie~b Yongqiang Yu~c ~a department of A tmospheric science,nanjing {3.,nanjing 210093,china ~b Institute of Meteorology,PLA {3. of science and Technology,nanjing 211101,china ~c LASG,Institute of Atmospheric Physics,Chinese Academy of sciences,Beijing 100029,china department of Atmospheric science Nanjing University Nanjing 210093 China Institute of Meteorology PLA University of Science and Technology Nanjing 211101 China LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The interannual-to-interdecadal relationship between the Pacific sea surface temperature (SST) and the northern hemispheric midlati- tude’s atmosphere represented by the circumpolar vortex was documented with the global oceanic and atmospheric reanalysis data of recent 50 *** covarying modes of the Pacific SST and northern circumpolar vortex anomalies during winter were examined using the sin- gular value decomposition and wavelet analysis *** is the interannual,ENSO-related mode and the other is the interdecadal, North Pacific SST-related mode with a period of around 20 *** two modes exhibit distinct spatial *** the interannual mode,the SST anomaly is characterized by a typical ENSO pattern with the principal signature in the tropical eastern Pacific and secondary one in the central North Pacific,while the atmospheric anomaly is regional,characterized by a Pacific-North American *** the inter- decadal mode,large SST anomaly is located in the central North Pacific,while the atmospheric anomaly is zonally global,associated with the midlatitute’s standing long-wave *** the central North Pacific is colder,the long-wave is stronger,and vice *** investigations suggest that the interdecadal mode could involve an interaction between "two oceans and an atmosphere".

关键词： Sea surface temperature Atmospheric circulation ENSO Decadal variability

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Loop reduction techniques for reachability analysis of linear hybrid automata

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science china(Information sciences) 2012年第12期55卷 2663-2674页

作者： PAN MinXue,LI You,BU Lei & LI XuanDong State Key Laboratory for Novel Software Technology,department of Computer science and Technology,nanjing {3.,nanjing 210093,china 1. State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing 210093 China

The problem of reachability analysis of linear hybrid automata(LHA) is very *** paper considers to improve the efficiency of the reachability analysis by optimizing the structures of *** identify two types of loops called the flexible loops and the zero loops,and present the techniques to replace the repetitions of those loops in the behavior of LHA with finite sequences of locations and in the meantime simplify the associated *** techniques work not only for the polyhedral computing based algorithms but also for the bounded model checkers.

关键词： real-time and hybrid systems linear hybrid automata reachability analysis

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On c-equivalence

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science china Mathematics 2009年第12期52卷 2389-2396页

作者： LI Xia department of Mathematics,nanjing university,nanjing 210093,china 1. department of Mathematics Nanjing University Nanjing 210093 China

In this paper,we propose some c-equivalence specifically for autonomous Lagrangian systems and show how to construct connecting orbits in energy surface based on this c-equivalence.

关键词： c-equivalence autonomous Lagrangian systems connecting orbits 3.K14

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Sr, Nd and O Isotopic Studies on the Genesis of the Huashan Granite Complex

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Acta Geologica Sinica(English Edition) 1990年第1期64卷 41-54页

作者： Zhu Jinchu Li Xiangdong Shen Weizhou Wang Yinxi Yang Jiedong department of earth sciences,{3., nanjing, Jiangsu department of Materials Analysis,{3., nanjing, Jiangsu Jia Zhongpeng department of earth sciences Nanjing University Nanjing Jiangsu China

Systematical Sr, Nd and O isotopic studies were made on the Huashan granite complex in Guangxi. Incombination with the studies of geological, petrological and geochemical data, it is believed that the complexconsists of granites of three stages. with different geneses and different source materials. They are not the prod-ucts of differentiation and evolution of one single consanguineous magma. Granites of the 1st stage are of theIndosinian syntectic type or I type, also derived from a mixed mantle-crustal source. Those of the 2nd stage areof the early Yanshanian syntectic type or I type. also derived from a mixed mantle-crustal source, and those ofthe 3.d stage are of the late Yanshanian transformed type or S type. derived from a crustal source.

关键词： Nd and O Isotopic Studies on the Genesis of the Huashan Granite Complex Sr

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Two possible mechanisms for vortex self-organization

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science china earth sciences 2006年第2期49卷 202-211页

作者： LUO Zhexian2, ZHOU Xiuji1 & GAO Shouting3.1. Chinese Academy of Meteorological sciences, Beijing 100081, china 2. department of Space Information science, nanjing university of Information science and Technology, nanjing 210044, china 3. Institute of Atmospheric Physics, Chinese Academy of sciences, Beijing 100029, china 2. department of Environmental science Nanjing University of Information Science and Technology Nanjing 210044 China 1. Chinese Academy of Meteorological sciences Beijing 100081 China 3. Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The vortex self-organization is investigated in this paper by four groups of numerical experiments within the framework of quasi-geostrophic model, and based on the experimental results two types of possible mechanisms for vortex self-organization are suggested. The meso-scale to-pography may enable separated vortices to merge into a larger scale vortex; and the interaction of meso-γ and meso-β scale systems may make separated vortices to self organize a typhoon-like vor-tex circulation.

关键词： vortex, self-organization, meso-scale topography, interaction of different scales.

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Strange Stars: Can Their Crust Reach the Neutron Drip Density?

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Chinese Journal of Astronomy and Astrophysics 2003年第6期3卷 535-542页

作者： Hai Fu and Yong-Feng Huangdepartment of Astronomy, nanjing university, nanjing 210093 department of Astronomy Nanjing University Nanjing 210093 China

The electrostatic potential of electrons near the surface of static strange stars at zero temperature is studied within the frame of the MIT bag model. We find that for QCD parameters within rather wide ranges, if the nuclear crust on the strange star is at a density leading to neutron drip, then the electrostatic potential will be insufficient to establish an outwardly directed electric field, which is crucial for the survival of such a crust. If a minimum gap width of 200 fm is brought in as a more stringent constraint, then our calculations will completely rule out the possibility of such crusts. Therefore, our results argue against the existence of neutron-drip crusts in nature.

关键词： dense matter - elementary particles - stars: neutron

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Completely regular paracompact reflection of locales

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science china Mathematics 2006年第6期49卷 820-826页

作者： HE Wei & LUO Maokang department of Mathematics, nanjing Normal university, nanjing 210097, china department of Mathematics, Sichuan university, Chengdu 610064, china department of Mathematics Nanjing Normal University Nanjing 210097 China department of Mathematics Sichuan University Chengdu 610064 China

We give an explicit construction of the completely regular paracompact reflection pL of a completely regular locale L described as a sublocale of the Stone-tech compactification βL of L.

关键词： completely regular paracompact locale, nucleus.

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REGULARITIES AND SINGULARITIES OF THE ENERGY MINIMIZERS OF THE HEISENBERG GROUP TARGETS

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Acta Mathematica Scientia 2003年第4期23卷 447-452页

作者：贾高 School of science Nanjing University of Science and Technology Nanjing 210094 China Department of Mathematics Bengbu Tank Institute Bengbu 233013 China

In this paper, the properties of the maps for the Heisenberg group targets are studied. For u e∈W1,α(Ω, Hm), some Poincare type inequalities are proved. For the energy minimizers, the ∈-regularity theorems and the... 详细信息

关键词： Heisenberg group energy minimizer Legendrian map regularity singularity

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Some new results on planar harmonic mappings

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science china Mathematics 2010年第3期53卷 597-604页

作者： CHEN HuaiHui department of Mathematics, nanjing Normal university, nanjing 210097, china 1. department of Mathematics Nanjing Normal University Nanjing 210097 China

This survey paper contains some new results on the Landau theorem, Bloch theorem and Schwarz-Pick lemma for planar harmonic mappings.

关键词： harmonic mapping Landau theorem Bloch constant Schwarz-Pick lemma quasi-regularity

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Progress in Natural science:Materials International 2005年第12期15卷 1110-1116页

作者： LIU Gang,LI Xin,JIANG Weimei and LI Min department of Atmospheric sciences,nanjing {3.,nanjing 210093,china Beijing Municipal Environmental Protection Bureau,Beijing 100044,china department of Atmospheric sciences Nanjing University Nanjing 210093 China. Beijing Municipal Environmental Protection Bureau Beijing 100044 China

The S-L (She and Leveque) scaling law,also named the hierarchical similarity theory,has been extensively tested for the turbulence made in the laboratory,but seldom been tested for the turbulence in the atmospheric boundary layer (ABL).In this paper, the S-L scaling law is applied to the turbulence in the ABL observed under unstably stratified conditions and over different types of underlying *** results of analyses show that over this type of homogeneous and flat underlying surface,such as the underlying surface in HUBEX (Huaihe River Basin Energy and Water Cycle Experiment),vertical speed and temperature fields well satisfy the S-L scaling *** the turbulence over the homogeneous but rather rough underlying surface of forest and under unstably stratified conditions in PFRD (Park Falls Ranger District of the Chequamegon National Forest,Wisconsin,USA),the analyses show that the vertical speed and temperature fields sometimes conform sometimes do not conform to the S-L scaling ***,at a time,either both of the vertical speed and temperature fields conform to the S-L scaling law,or both of them do *** speed fields in both of the field experiments do not satisfy the S-L scaling *** new explanation of the above-mentioned phenomena is given.

关键词： atmospheric turbulence Reynolds number S-L scaling law in the atmospheric turbulence boundary layer processes nonlinear dynamics

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