POLYCYCLE

作品数：8被引量：7H指数：1
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相关作者：石磊蒋华马英杰周正唐亮更多>>
相关机构：北京邮电大学北京电子科技学院更多>>
相关期刊：《Science Bulletin》《Acta Mathematica Sinica,English Series》《Science China Mathematics》《系统工程理论与实践》更多>>
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Bowl-shaped conjugated polycycles被引量：1
《Chinese Chemical Letters》2016年第8期1166-1174,1465,共9页Xue-Qing Hou Yan-Tao Sun Lei Liu Shi-Tao Wang Rui-Li Geng Xiang-Feng Shao 
the National Natural Science Foundation of China(Nos.21522203,21372111,and 21190034);State Key Laboratory of Applied Organic Chemistry for the financial support
The conjugated polycycles show excellent optical and electrical properties that are suitable for application in various organic electronics.While most of attentions have been paid to polycycles having planar π-conjug...
关键词：Conjugated polycycle Curved π-system Bucky bowl Heteroatom doping Electronic structure 
基于Polycycle信号的UWB正交脉冲序列设计
《系统工程理论与实践》2012年第11期2564-2569,共6页马英杰 周正 蒋华 石磊 唐亮 
国家自然科学基金(60772021);国家高技术研究发展计划(863计划)(2009AA01Z262);国家科技重大专项(2009ZX03006-006/-009);韩国知识经济部IITA指导下的ITRC项目(HTA-2009-C1090-0902-0019);北京电子科技学院基本科研业务费资助项目(BESTI-JBKY-201106)
正交脉冲的产生是超宽带无线应用中的关键技术,采用Hermite矩阵特征向量分解方法,提出了一种基于Polycycle信号的UWB正交脉冲序列设计方法.该方法产生的正交成形脉冲功率谱密度分布符合FCC关于室内和室外UWB应用的辐射限制,有较高的频...
关键词：超宽带脉冲无线电 HERMITE矩阵 Polycycle脉冲 功率谱密度 多用户干扰 
Linear estimation and distribution of the limit cycles bifurcated from a kind of degenerate polycycles
《Science China Mathematics》2007年第3期334-344,共11页Li-qin ZHAO Department of Mathematics, Beijing Normal University, Beijing 100875, China 
This work was supported by the National Natural Science Foundation of China(Grant No.10671020)
In this paper, we investigate the number and the distribution of the limit cycles bifurcated from a kind of degenerate planar polycycles through three singular points: a saddle-node P 0, a fine saddle P 1 with finite ...
关键词：degenerate polycycle CYCLICITY finitely-smooth normal form transition map 34C05 34C23 58F14 
Cyclicity of a kind of degenerate polycycles through three singular points被引量：1
《Science China Mathematics》2005年第6期746-756,共11页ZHAO Liqin 
This work was supported by the National Natural Science Foundation of China(Grant No.19901001).
This paper deals with the cyclicity of a kind of degenerate planar polycycles through a saddle-node P0 and two hyperbolic saddles P1 and P2, where the hyperbolicity ratio of the saddle P1 (which connects the saddle-no...
关键词：DEGENERATE polycycle  cyclicity  finitely-smooth NORMAL form  transition map. 
Cyclicity of Degenerate Polycycles Through a Saddle-Node and Two Hyperbolic Saddles
《Acta Mathematica Sinica,English Series》2005年第3期507-516,共10页Li Qin ZHAO 
Project sponsored by National Science Foundation (19901001)
This paper deals with the cyclicity of a kind of degenerate planar polycycles through a saddle-node and two hyperbolic saddles, where the hyperbolicity ratio of the saddle （which connects the saddle-node with hp-conn...
关键词：Degenerate polycycle CYCLICITY Finitely-smooth normal form Transition map 
Cyclicity of elementary polycycles and ensembles with codimension 3 degeneration被引量：6
《Chinese Science Bulletin》1998年第22期1849-1864,共16页Liqin Zhao Weigu Li Zhifen Zhang 
theNationalNaturalScienceFoundationofChina (GrantNo .197710 0 7);theDoctoralProgramFoundationofInstitutionofHigherEducationofChina (GrantNo.96 0 0 0 15 4 )
The conjecture E(k)≤k is proved to be true if and only if k=1, 2, 3, where E(k) is the cyclicity of condimension k generic elementary polycycles. It is also proved that the cyclicity of any codimension 3 ensembles ex...
关键词：POLYCYCLE CYCLICITY finitely_smooth normal form Dulac map 
Cyclicity of planar polycycles and ensembles with codimension 3 degeneration through a saddle-node and two hyperbolic saddles被引量：1
《Science China Mathematics》1998年第8期829-836,共8页赵丽琴 
The cyclicity of four classes of codimension 3 plnnar polycycles and ensembles containing a saddle-node and two hyperbdic saddles is dealt with. The exnct cyclicity or cyclicity bound of them is obtained by finitely-s...
关键词：POLYCYCLE finitely smooth normal form transition MAP Dulac map. 
Bifurcation phenomenon of a class of planar codimension 3 polycycle S^(2) with two saddles resonating
《Science China Mathematics》1997年第12期1259-1271,共0页李宝毅 张芷芬 
Project supported by the National Natural Science Foundation of China and the DEPF of China.
By means of finitely-smooth normal form theory and the method of infinitesimal analysis,it is proved that the cyclicity of a planar codimension 3 polycycle S(2) is three and the complete bifurcation diagram is provided.
关键词：POLYCYCLE cycllclty finitely-smooth NORMAL form. 
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