检索结果-南通市图书馆

Hyperbolic orbit and its variation of deep-space probe

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2003年第2期46卷 191-197页

作者：刘林王歆 Department of Astronomy Nanjing UniversityNanjing 210093China

While approaching the target body, the deep-space probe is orbiting hyperbolically before the maneuver. We discuss the variation of perturbed hyperbolic orbit using the method similar to that used in elliptic orbit. E... 详细信息

关键词： deep-space probe, hyperbolic orbit, perturbation motion.

Relativistic electron flux enhancement at synchronous orbit during SEP event on July 14,2000

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2002年第5期45卷 399-408页

作者：赵华朱光武王世金高玉芬刘振兴 Space Weather Research Laboratory Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

Relativistic (E >1.6 MeV) electron flux enhancements during Solar Energetic Particle (SEP) events as observed by the synchronous FY-2 satellite at orbit located at 105°E are investigated. Energetic protons during SEP events heavily contaminate relativistic electron flux measurements. The ratio of the contamination in the original measurement of relativistic electron flux was over 30% during most of the SEP event on July 14, 2000. A method has been developed to eliminate the contamination caused by the energetic protons, and a 'corrected' relativistic electron flux has been obtained. The 'cleaned-up' relativistic electron flux measurement shows that relativistic electron flux enhancement at synchronous orbit is well correlated with SEP events during which the IMF Bz has some southward periods. The enhancement could arise as the transport of relativistic electrons from the upstream solar wind into synchronous orbit via the magnetotail.

关键词： synchronous orbit, relativistic electron flux, solar energetic particle event.

Codimension 3 nonresonant bifurcations of homoclinic orbits with two inclination flips

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第2期48卷 248-260页

作者： SHUI Shuliang & ZHU Deming College of Mathematics and Physics, Zhejiang Normal University, Jinhua 321004, China Department of Mathematics, East China Normal University, Shanghai 200062, China College of Mathematics and Physics Zhejiang Normal University Jinhua China Department of Mathematics East China Normal University Shanghai China

Homoclinic bifurcations in four-dimensional vector fields are investigated by setting up a local coordinate near a homoclinic orbit. This homoclinic orbit is principal but its stable and unstable foliations take inclination flip. The existence, nonexistence, and uniqueness of the 1-homoclinic orbit and 1-periodic orbit are studied. The existence of the two-fold 1-periodic orbit and three-fold 1 -periodic orbit are also obtained. It is indicated that the number of periodic orbits bifurcated from this kind of homoclinic orbits depends heavily on the strength of the inclination flip.

关键词： bifurcation, homoclinic orbit, non-resonance, inclination flip, 1-periodic orbit.

The existence of Silnikov's orbits in one coupled Duffing equation

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2003年第1期46卷 11-23页

作者：李威井竹君徐彭城 Beijing University of Chemical Technology Institute of Mathematics Chinese Academy of Sciences Institute of Mathematics Chinese Academy of Sciences Institute of Applied Mathematics Chinese Academy of Sciences

The existence of Silnikov's orbits in one coupled Duffing equation is discussed by using the fiberstructure of invariant manifold and high-dimensional Melnikov's method. Example and numerical simulationresults are als... 详细信息

关键词： Silnikov's orbit, invariant manifold, coupled Duffing equation.

Bifurcations of rough heteroclinic loop with two saddle points

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2003年第4期46卷 459-468页

作者：金银来朱德明 Department of Mathematics Linyi Teachers' UniversityLinyi 276005China Department of MathematicsEast China Normal UniversityShanghai 200062 China Department of Mathematics East China Normal UniversityShanghai 200062

The bifurcation problems of rough 2-point-loop are studied for the case ρ11＞λ11,ρ1/2＜λ1/2,ρ11ρ12＜λ11λ2, where-ρ1i＜0 and λ1i＞0 are the pair of principal eigenvalues of unperturbed system at saddle point pi, i= 1, 2. Under the transversal and nontwisted conditions, the authors obtain some results of the existence of one 1-periodic orbit, one 1-periodic and one 1-homoclinic loop, two 1-periodic orbits and one 2-fold 1-periodic orbit. Moreover, the bifurcation surfaces and the existence regions are given, and the corresponding bifurcation graph is drawn.

关键词： local coordinates, Poincare map, 1-homoclinic loop, 1-periodic orbit, 2-fold 1-periodic orbit, bifurcation surface.

DISSIPATIVE SCHEMES WITH PROPERTY OF INHERITING HOMOCLINIC orbitS FOR 2N-DIMENSIONAL HAMILTONIAN SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics A Journal of Chinese Universities(English Series) 2002年第2期11卷 197-212页

作者： Du Weihua(杜维华) Huang Mingyou(黄明游) Mathematical Departmeant Harbin Engineering University Harbin 150001 PRC Institute of Mathematics Jilin University Changchun 130023PRC

In this paper we develop a kind of dissipative discrete scheme for the computation of homoclinic orbits near TB-point in Hamiltonian systems. It is proved by using continuation method that when the dissipative term and its coefficient are suitably chosen, this scheme possesses discrete homoclinic orbits, which approximate the continuous homoclinic orbits with second order accuracy w.r. to time-step size.

关键词： Hamiltonian system, homoclinic orbit, dissipative scheme, continuation method.