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Weconsiderthequadraticsystemoftype(I)m=0acordingtotheclasificationof[1].Withoutlosofgenerality,wemayasumethatthesystemistaken... 相似文献
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Ali. Elamin. M. Saeed 《Annals of Differential Equations》2006,22(2):127-133
The purpose of this paper is to study a general Lienard type cubic system with one antisaddle and two saddles. We give some results of the existence and uniqueness of limit cycles as well as the evolution of limit cycles around the antisaddle for system (2) in the following when parameter a1 changes. 相似文献
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XIE Xinhua ZENG Zhinan LI Ruxin CHEN Shu LU Haihe YIN Dingjun & XU Zhizhan Key Laboratory for High Intensity Optics Shanghai Institute of Optics Fine Mechanics Chinese Academy of Sciences Shanghai China 《中国科学G辑(英文版)》2004,47(4):492-501
High-order harmonics are generated by coherent interaction of an intense laser and atoms or molecules[1]. With the development of the intense ultrashort pulse laser, the research of high-order harmonic generation has reached the water-window in spectral region[2] and subfemtosecond in time domain[3]. Especially, the generation and application of subfemtosecond pulse led the study of high-order harmonic generation into a completely new world[4, 5]. It has made the study of ultrafast science fro… 相似文献
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In this paper, we characterize the graphs with infinite cyclic edge connectivity. Then we design an efficient algorithm to determine whether a graph has finite cyclic edge connectivity or infinite cyclic edge connectivity. 相似文献
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It is proved that a cyclically (k ? 1)(2n ? 1)-edge-connected edge transitive k-regular graph with even order is n-extendable, where k ≥ 3 and k ? 1 ≥ n ≥ ?(k + 1)/2?. The bound of cyclic edge connectivity is sharp when k = 3. © 1993 John Wiley & Sons, Inc. 相似文献
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Halin图中的Hamilton路径 总被引:3,自引:0,他引:3
本文证明了所有的Halin图都是Hamilton连通的,并给出反例,说明Halin图中存在两条独立边不包含在任何Hamilton圈中。 相似文献
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The synthesis and characterization of a novel polymerizable ionic liquid derived from polyfluorene, poly[3‐methyl‐1‐(4‐(9‐methyl‐fluorene)‐butyl)‐imidazolium hexafluorophosphate] (PFIL), are described. 相似文献
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A three-dimensional micromagnetic model with non-uniform grain size distribution has been built up to study the magnetization process in FePt L10 perpendicular media. A 3D model of a single FePt magnetic grain is also set up for comparison. The high magneto-crystalline anisotropy Ku results in a short exchange length lex in FePt nanograins. Therefore a magnetic grain is divided into smaller grids on the order of lex. The simulated perpendicular and longitudinal loops are consistent with experiments, and it is explained why the measured perpendicular Hc is relatively smaller compared with the saturation field of the longitudinal loop in the FePt perpendicular medium. 相似文献
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Let G be a graph with a perfect matching M. In this paper, we prove two theorems to characterize the graph G in which there is no M-alternating path between two vertices x and y in G. 相似文献