Results 1 to 10 of about 4,619,884 (143)
On the Shape of Limit Cycles That Bifurcate from Isochronous Center [PDF]
The Scientific World Journal, 2014 New idea and algorithm are proposed to compute asymptotic expression of limit cycles bifurcated from the isochronous center. Compared with known inverse integrating factor method, new algorithm to analytically computing shape of limit cycle proposed in ...
Guang Chen, Yuhai Wu
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Limit Cycles and Integrability of a Class of Quintic System
Mathematics, 2022 In this paper, a class of quintic systems is investigated. The first 13 focal values are computed with the aid of MATHEMATICA. Then the necessary conditions of integrability and linearizability are obtained and the sufficiency of every condition is ...
Yanli Tang, Dongmei Zhang, Feng Li
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On the analytic commutator for $\Lambda$−$\Omega$ differential systems
Electronic Journal of Qualitative Theory of Differential Equations, 2023 In this paper, we give the necessary and sufficient conditions for some $\Lambda$−$\Omega$ differential systems to have an analytic commutator, use these properties to judge the origin point of the $\Lambda$−$\Omega$ differential systems to be an ...
Zhengxin Zhou
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Linearizability conditions of quasi-cubic systems
Electronic Journal of Qualitative Theory of Differential Equations, 2012 In this paper we study the linearizability problem of the two-dimensional complex quasi-cubic system $\dot{z}=z+(zw)^{d}(a_{30}z^{3}+a_{21}z^{2}w+a_{12}zw^2+a_{03}w^{3}),~\dot{w}=-w-(zw)^{d}(b_{30}w^{3}+b_{21}w^{2}z+b_{12}wz^2+b_{03}z^{3})$, where $z, w,
Wentao Huang, Xingyu Fan, Xingwu Chen
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Tephrostratigraphy of Jurassic-Cretaceous boundary beds of Western Siberia
Russian Journal of Earth Sciences, 2022 The age of tuffaceous interlayers, represented by tuffs and tuffites, which are common in the Upper Jurassic-Lower Cretaceous deposits of Western Siberia (the Bazhenovo, Tutleim and Frolov Formations), is discussed.
Panchenko Ivan Vladimirovich +4 more
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On the Limit Cycles for Continuous and Discontinuous Cubic Differential Systems
Discrete Dynamics in Nature and Society, 2016 We study the number of limit cycles for the quadratic polynomial differential systems x˙=-y+x2, y˙=x+xy having an isochronous center with continuous and discontinuous cubic polynomial perturbations.
Ziguo Jiang
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Significance of functional organization of settlements for development of primary rural settlements in the City of Zaječar [PDF]
Zbornik radova Departmana za geografiju, turizam i hotelijerstvo, 2020 The aim of this paper is determination of the City of Zaječar settlements' functional organization characteristics significant for development of primary rural settlements on this territory.
Popović Vladimir
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Brazilian Journal of Geology, 2020 Alta Floresta Gold Province occurs in the center-south portion of the Amazon Craton. Trairão gold deposit, which is located in the Alta Floresta Gold Province, is hosted by 1878 to 1854 Ma arc-related granites. Two important Au deposits take place in the
Mara Luiza Barros Pita Rocha +7 more
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Center conditions for a simple class of quintic systems
International Journal of Mathematics and Mathematical Sciences, 2002 We obtained center conditions for an O-symmetric system of degree 5 for which the origin is a uniformly isochronous singular point.
Evgenii P. Volokitin
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The Problem of Bicenter and Isochronicity for a Class of Quasi Symmetric Planar Systems
Abstract and Applied Analysis, 2014 We study a class of quasi symmetric seventh degree systems and obtain the conditions that its two singular points can be two centers at the same step by careful computing and strict proof. In addition, the condition of an isochronous center is also given.
Du Chaoxiong
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