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A MODIFIED PROJECTION AND CONTRACTION METHOD FOR A CLASS OF LINEAR COMPLEMENTARITY PROBLEMS

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Journal of Computational Mathematics 1996年第1期14卷 54-63页

作者： B.S. He(Department of Mathematics, nanjing university, nanjing, China) 南京大学数学系江苏南京

Recently, we have proposed an iterative projection and contraction (PC) method for a class of linear complementarity problems (LCP)([4]). The method was showed to be globally convergent, but no statement could be made about the rate of convergence. In this paper, we develop a modified globally linearly convergent PC method for linear complementarity problems. Both the method and the convergence proofs are very simple. The method can also be used to solve some linear variational inequalities. Several computational experiments are presented to indicate that the method is surprising good for solving some known difficult problems.

关键词： Th Pn A MODIFIED PROJECTION AND CONTRACTION METHOD FOR A CLASS OF LINEAR COMPLEMENTARITY PROBLEMS II

On critical values concerning the evolution of the long period families

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Chinese Journal of Astronomy and Astrophysics 2009年第4期9卷 494-500页

作者： Xi-Yun Hou1,21 Astronomy Department, nanjing university, nanjing 210093, China 2 Institute of Space Environment and Astronautics, nanjing university, nanjing 210093, China Astronomy Department Nanjing University Nanjing 210093 China Institute of Space Environment and Astronautics Nanjing University Nanjing 210093 China

In a previous paper, we proposed another special critical value concerning the evolution of the long period family around the equilateral equilibrium points, besides the two values given by Henrard. Are there any other special critical values？ After studying the stability curves of the long period family carefully, we gave a negative answer. During the study, we found an interesting family of periodic orbits which we called the homo family. We studied the evolution of this family following the increase of μ. With these findings, we were able to explain the origin of the four branches of periodic families emanating from L4 and the stability results of the equilateral equilibrium points.

关键词： celestial mechanics

The Late Proterozoic Trench-Basin-Arc System in the Northeastern Jiangxi-Southern Anhui Region

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Acta Geologica Sinica(English Edition) 1990年第3期64卷 275-286页

作者： Xu Bei Department of Geosciences, nanjing university, nanjing, Jiangsu Fei Zhenbi Department of Geosciences Nanjing University Nanjing Jiangsu

Proterozoic rocks in the northeastern Jiangxi-southern Anhui may fall into three rock associations whichbelong to different but interrelated tectono-palaeogeographic units. The field geological and petrochemicalcharacteristics of the northeastern Jiangxi-western Zhejiang volcanic zone indicate that it was once an islandarc zone. An analysis of the sedimentary characteristics of Proterozoic turbidites lying north of the zone has re-vealed the history of development of a back-arc basin. According to the type of the Proterozoic rock formationsouth of the zone, it may be deduced that the formation might represent the fore-arc and trench areas. Bymeans of various tectono-palaeogeographic analyses, the relation between the island arc zone and the back-arcbasin is inferred and the Late Proterozoic tectono-palaeogeographic development is discussed by using themodel of the trench-arc-basin system.

关键词： The Late Proterozoic Trench-Basin-Arc System in the Northeastern Jiangxi-Southern Anhui Region Arc

Depth zonation of Arenigian acritarchs in South China

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Chinese Science Bulletin 1997年第3期42卷 248-251页

作者： XU WanhongDepartment of Earth Sciences, nanjing university, nanjing 210093, China Department of Earth Sciences Nanjing University Nanjing China

STAPLIN revealed that palaeoenvironment changes seem to control acritarch distribution patterns. However, scientists have been puzzled by the fact that characteristic offshore acritarchs occur with nearshore ones. This note demonstrates depth zonation of Arenigian acritarchs in South China and reveals the variation of water depth in South China during the Arenig Age.

关键词： South China Arenigian acritarch depth zonation.

A Doubly Achromatic Two-magnet Nonuniform Field Bending System of 270° in Deflection

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Chinese journal of nuclear physics 1995年第2期17卷 179-184页

作者： Wang Houwen(Department of Physics,nanjing university,nanjing 210008) nanjing Univ Nanjing China

A new doubly achromatic two-magnet beam bending system is *** of two nonuniform dipoles separated by a small drift *** doublyachromatic relations are *** system showed excellent achromatic and focusingproperties and good quality of electron beam with small *** small diver-gence and axial symmetry were produced at the output of the *** system isspecially suitable for low energy electron linac beam with large energy spread.

关键词： 270° doubly achromatic deflection Two nonuniform field dipoles Small and axial symmetric beam

ON TWO CONJECTURES OF THE QUADRATIC DIFFERENTIAL SYSTEMS

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Chinese Annals of Mathematics,Series B 1997年第4期18卷 429-434页

作者： ZHANG XIANG Institute of Mathematics,nanjing Normal university,nanjing 210097,China 南京师范大学数学所江苏南京

Two conjectures in the qualitative theory of quadratic differential systems are proved under certain conditions.

关键词： Quadratic system Limit cycle Dulac function

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

Present Status and Future Development of Mobile Internet

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China Communications 2009年第1期6卷 113-118页

作者： Wang Jian1, Bi Houjie2 1nanjing university, nanjing 210093, China 2nanjing university of Posts and Telecommunications, nanjing 210003, China nanjing university Nanjing 210093 China nanjing university of Posts and Telecommunications Nanjing 210003 China

With the integration of telecommunications network and Internet, mobile Internet is bound to rise. Mobile Internet brings not only high-quality business experience; but also enormous challenges to telecommunications. The current status and hierarchical structure of the mobile Internet are presented. Technological advances and market demand are promoting development of mobile Internet, and terminals, networks and businesses are three elements of the development of the mobile Internet. Mobile IP technique and related protocols are described systematically, which are designed to allow mobile terminal and the mobile sub-network to roam within the Internet. Then the IP Multimedia Subsystem (IMS) and its architectural framework are expounded, which are designed by (3GPP). The credible and reliable IP network architecture with Quality of Service (QoS) based on IMS is discussed to meet the needs of the next generation of mobile Internet. Finally, the hotspots such as P2P/ Multicast/ Security are pointed out within the mobile Internet.

关键词： Mobile Internet mobile IP IMS network convergence

Measures and dimensions of fractal sets in local fields

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Progress in Natural Science:Materials International 2006年第12期16卷 1260-1268页

作者： QIU Hua** and SU Weiyi(Department of Mathematics, nanjing university, nanjing 210093, China) Department of Mathematics Nanjing University Nanjing 210093 China

The study of fractal analysis over the local fields as underline spaces is very important since it can motivate new approaches and new ideas, and discover new techniques in the study of fractals. To study fractal sets in a local field K, in this paper, we define several kinds of fractal measures and dimensions of subsets in K. Some typical fractal sets in K are constructed. We also give out the Hausdorff dimensions and measures, Box-counting dimensions and Packing dimensions, and stress that there exist differences between fractal analysis on local fields and Euclidean spaces. Consequently, the theoretical foundation of fractal analysis on local fields is established.

关键词： local field p-series field Hausdorff measure and dimension Boxcounting dimension Packing measure and dimension Cantor type set.