检索结果-南通市图书馆

Two possible mechanisms for vortex self-organization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science {1. Earth sciences 2006年第2期49卷 202-211页

作者： luo {1.2, ZHOU Xiuji1.& gao Shouting3 1. Chinese Academy of Meteorological sciences, Beijing 1.0081. china 2. Department of Space information science, nanjing university of information science and technology, nanjing 21.044, china 3. Institute of Atmospheric Physics, Chinese Academy of sciences, Beijing 1.0029, 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.

Investigation of fine and complex vortex circulation structures

在线全文

学校读者我要写书评

暂无评论

science {1. Earth sciences 2010年第10期53卷 1552-1558页

作者： luo {1.1.MA GeLan1.& PING Fan2 1.remote Sensing college,nanjing university of information science and technology,nanjing 21.044,china 2 Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS),Institute of Atmospheric Physics,Chinese Academy of sciences,Beijing 1.0029,china 1. remote Sensing {1. Nanjing University of Information Science and Technology Nanjing 210044 China2. Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The formation and evolution of fine and complicated vortex circulation structures were investigated using a two-dimensional quasi-geostrophic barotropic model *** find that the highly localized asymmetric and complex configuration of energy transfer flux between large-and small-scale components is caused by the nonlinear interaction between a large-scale vortex with an initial axi-symmetric flow and four beta meso-scale *** complex structure is characterized by a fine pattern,which contains seven closed systems with spatial scales of less than 1.0 km,embedded in a positive flux wave train and a negative wave train,*** average wind speed decreased with time in the positive flux region,but was nearly unchanged in the negative flux *** pattern reveals the evolutionary asymmetry and localization of wind speed of the major *** track of the major vortex center has a trend toward the center of the negative flux center,indicating that there is a certain relation between the complex structure of the energy transfer flux and the motion of the major vortex *** results imply that the formation and evolution of the fine and complex structure should be attributed to the nonlinear interaction between the vortices at different spatial scales.

关键词： vortex complex structure non-linear interaction energy cascade

Quantum secret sharing between multiparty and multiparty with four states

在线全文

学校读者我要写书评

暂无评论

science {1.(Physics,Mechanics & Astronomy) 2007年第5期50卷 572-580页

作者： YAN FengLi1. gao Ting2 & LI YouCheng1.1.{1. of Physics and information Engineering, Hebei Normal university, Shijiazhuang 05001., china 2 {1. of Mathematics and information science, Hebei Normal university, Shijiazhuang 05001., china 1. college of Physics and {1. Engineering Hebei Normal University Shijiazhuang 050016 China 2. college of Mathematics and {1. science Hebei Normal University Shijiazhuang 050016 China

A protocol of quantum secret sharing between multiparty and multiparty with four states was presented. It was shown that this protocol can nullify the Trojan horse attack with a multi-photon signal, the fake-signal attack with Einstein-Podolsky- Rosen pairs, the attack with single photons, and the attack with invisible photons. In addition, the upper bounds of the average success probabilities were given for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing, security, Einstein-Podolsky-Rosen pairs

Quantum secret sharing between m-party and n-party with six states

在线全文

学校读者我要写书评

暂无评论

science {1.(Physics,Mechanics & Astronomy) 2009年第8期52卷 1191-1202页

作者： gao Ting1.YAN FengLi2,3 & LI YouCheng2,3 1.{1. of Mathematics and information science,Hebei Normal university,Shijiazhuang 05001.,china 2 {1. of Physics and information Engineering,Hebei Normal university,Shijiazhuang 05001.,china 3 Hebei Advanced Thin Films Laboratory,Shijiazhuang 05001.,china college of Mathematics and {1. science Hebei Normal University Shijiazhuang 050016 China college of Physics and {1. Engineering Hebei Normal University Shijiazhuang 050016 China Hebei Advanced Thin Films Laboratory Shijiazhuang 050016 China

A quantum secret sharing scheme between an m-party group and an n-party group is proposed using three conjugate bases.A sequence of single photons,each of which is prepared in one of the six states,is used directly to encode classical information in the quantum secret sharing *** this scheme,each of all m members in group 1.chooses randomly his/her own secret key individually and independently,and directly encodes his/her respective secret information on the states of single photons via unitary operations,then the last one sends 1.n of the resulting qubits to each member of group *** measuring their respective qubits,all members in group 2 share the secret information shared by all members in group *** renders impossible a Trojan horse attack with a multi-photon signal,a fake-signal attack with EPR pairs,an attack with single photons,and an attack with invisible *** give the upper bounds on the average success probabilities for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing security EPR pairs

A centrality measure based on spectral optimization of modularity density

在线全文

学校读者我要写书评

暂无评论

science {1.(information sciences) 2010年第9期53卷 1727-1737页

作者： FU LiDong1.2*,gao Lin1.& MA XiaoKe1.1.chool of Computer {1. and Engineering,Xidian university,Xi'an 71.071.china 2college of Computer,Xi'an university of {1. and technology,Xi'an 71.054,china 1. School of Computer science and Engineering Xidian University Xi’an 710071 China2. College of Computer Xi’an University of Science and Technology Xi’an 710054 China

Centrality analysis has been shown to be a valuable method for the structural analysis of complex *** is used to identify key elements within networks and to rank network elements such that experiments can be tailored to interesting *** this paper,we show that the optimization process of modularity density can be written in terms of the eigenspectrum of kernel *** on the eigenvectors belonging to the largest eigenvalue of kernel matrix,we present a new centrality measure that characterizes the contribution of each node to its assigned community in a network,called modularity density *** measure is illustrated and compared with the standard centrality measures by using respectively an artificial example and a classic network data *** statistical distribution of modularity density centrality is investigated by considering large computer generated graphs and two large networks from the real *** results show the significance of the proposed approach.

关键词： centrality modularity density centrality kernel matrix eigenspectrum

EST-derived microsatellites in P seudosciaena crocea and their applicability to related species

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第6期29卷 83-91页

作者： YE Hua WANG Xiaoqing gao Tianxiang WANG Zhiyong college of Animal {1. and technology Hunan Agricultural University Changsha 410128 China Key Laboratory of science and {1. for Aquaculture and Food Safety Fisheries College/Fisheries Biotechnology Institute Jimei University Xiamen 361021 China Key Laboratory of Mariculture Ministry of Education Ocean University of China Qingdao 266003 China

Simple sequence repeat （SSR） markers were obtained for the large yellow croaker Pseudosciaena crocea using 1.205 expressed sequences tags （ESTs） from the NCBI *** for 48 ESTSSR loci were designed and screened with 30 *** specimens captured from Guanjingyang sea area in Fujian Province of *** of the loci were polymorphic,which were amplified with 3 to 1. alleles per locus and the mean of *** observed and expected heterozygosity per locus ranged from 0.091.to 0.844 （mean 0.544） and from 0.1.8 to 0.892 （mean 0.644）,*** information content （PIC） ranged from 0.1.5 to 0.866 （mean 0.593）.The results for cross-species amplification of the 1. large yellow croaker EST-SSRs on ***,***,***,*** and *** revealed that 1.,1.,1.,7 and 6 loci were successfully amplified with 1.to 1. alleles with an average of 4.5 per locus,respectively,which are suitable for population genetics studies of these species and useful for phylogenetic relationship analysis among these ***,this study provides a set of type I markers for population genetics studies and genome mapping for large yellow croaker and its closely related species.

关键词： Pseudosciaena crocea EST-SSRs genetic diversity cross-species amplification

Fractionation of Heavy Metals in Sediments from Dianchi Lake,china

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2007年第2期17卷 265-272页

作者： LI Ren-Ying YANG Hao ZHOU Zhi-gao Lü Jun-Jie SHAO Xiao-Hua JIN Feng State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China）. college of Geography {1. Nanjing Normal University Nanjing 210097 （China） Department of Applied Meteorology Nanjing University of Information Science ＆ Technology Nanjing 210044 （China）

Fractionation of heavy metals in sediments can help in understanding potential hazards of heavy metals. The present study analyzed total concentrations and fractions of selected heavy metals （Cd, Cr, Cu, Pb, and Zn） in surface sediments from Dianchi Lake, yunnan Province, {1., as well as factors that may affect distributions of the various heavy metal fractions. Total concentrations of the heavy metals decreased in the order Zn 〉 Cu 〉 Pb 〉 Cr 〉 Cd. These heavy metals, except Cr, were much higher than their background levels, indicating that Dianchi Lake was polluted by Cd, Zn, Pb, and Cu. Cadmium occurred mainly as the non-residual fraction （sum of the HOAc-soluble, reducible, and oxidizable fractions）（97.6%）, and Zn （55.7%） was also predominantly found in the non-residual fraction. In contrast, most of the Cr （88.5%）, Pb （81.8%）, and Cu （59.2%） occurred in the residual fraction. Correlation analysis showed that total heavy metal concentrations, organic matter and reducible Fe were the main factors affecting the distributions of the various heavy metal fractions. In the Walhai section of Dianchi Lake （comprising 97% of the lake area）, the concentrations of Cd, Zn, Pb, and Cu in the non-residual fraction were significantly lower （P ≤ 0.01.or 0.05） than those of the Caohal section （3% of the lake area）. This indicated that potential heavy metal hazards in the Caohai section were greater than the Waihai section.

关键词： Dianchi Lake heavy metal fractions lake sediment organic matter reducible Fe

Optimal controlled teleportation via several kinds of three-qubit states

在线全文

学校读者我要写书评

暂无评论

science {1.(Physics,Mechanics & Astronomy) 2008年第10期51卷 1529-1556页

作者： gao Ting1.2, YAN FengLi2,3 & LI YouCheng3 1.{1. of Mathematics and information science, Hebei Normal university, Shijiazhuang 05001., china 2 Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1. D-85748 Garching, Germany 3 {1. of Physics and information Engineering, Hebei Normal university, Shijiazhuang 05001., china college of Mathematics and {1. science Hebei Normal University Shijiazhuang 050016 China Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Str. 1 D-85748 Garching Germany college of Physics and {1. Engineering Hebei Normal University Shijiazhuang 050016 China

The probability of successful controlled teleportation of an unknown qubit using a general three-particle state is investigated. The analytic expressions of maximal probabilities via several kinds of tripartite states... 详细信息

关键词： controlled teleportation three-qubit state maximal probability

Nonlinear optical properties and superluminal propagation in the ruby

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2010年第6期55卷 473-477页

作者： gao Feng1.2,3,XU JingJun1.2,3,ZHANG GuoQuan1.2,3 & ZHANG WenDing1.2,3 1.Photonics Center,{1. of Physics science,Nankai university,Tianjin 300457,china 2 The Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials of Ministry of Education,Nankai university,Tianjin 300457,china 3 Tianjin Key Laboratory of Photonics Materials and technology for information science,Nankai university,Tianjin 300457,china Photonics Center College of Physics Science Nankai University Tianjin 300457 China Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials of Ministry of Education Nankai University Tianjin 300457 China Tianjin Key Laboratory of Photonics Materials and technology for {1. science Nankai University Tianjin 300457 China

In this review article,we summarized the study of the weak light nonlinear properties associated with group velocity change in the *** ruby could be reduced to a two-level system,in which population oscillations could lead to a subluminal *** the modulated TEM00 beam introduced into the ruby,self-phase modulation together with Fraunhofer diffractions and nondegenerate two-wave coupling between different spatial frequency components of the beam occurs at the same *** oscillations,self-phase modulation together with Fraunhofer diffractions and nondegenerate two-wave coupling mechanism competes with each other,which brings a new phenomenon of self-superluminal group velocity propagation in the ruby.

关键词：非线性光学性质超光速传播红宝石自相位调制 TEM00模速度变化光束耦合空间频率