Zobrazeno 1 - 10 of 107 pro vyhledávání: '"Zhengxin Zhou"'
1
Akademický článek
On the analytic commutator for $\Lambda$−$\Omega$ differential systems
Autor: Zhengxin Zhou
Publikováno v: Electronic Journal of Qualitative Theory of Differential Equations, Vol 2023, Iss 25, Pp 1-14 (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
Externí odkaz: https://doaj.org/article/af691a5d5a74429385aba9bf913768cd
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2
Akademický článek
Weak center for a class of $\Lambda$–$\Omega$ differential systems
Autor: Zhengxin Zhou
Publikováno v: Electronic Journal of Qualitative Theory of Differential Equations, Vol 2022, Iss 22, Pp 1-15 (2022)
In this paper, we give the necessary and sufficient conditions for a class of higher degree polynomial systems to have a weak center. As corollaries, we prove the correctness of the two conjectures about the weak center problem for the $\Lambda$–$\
Externí odkaz: https://doaj.org/article/ff94ba07e9b1492b81b2a3c9e07c0182
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3
Akademický článek
Expression and Correlation of Complement C3 and C4 in Serum and Maternal-Fetal Interface in Patients with Unexplained Recurrent Spontaneous Abortion: A Prospective Cohort Study
Autor: Zhengxin Zhou, Huixia Xie, Miao Liu, Ruopeng Li, Wenjing Jiang, Yan Zheng, Qun Lv
Publikováno v: Clinical and Experimental Obstetrics & Gynecology, Vol 50, Iss 11, p 252 (2023)
Background: In this study, we sought to detect the expression of complement C3 and C4 in serum and maternal-fetal interface in patients with unexplained recurrent spontaneous abortion, and analyze their correlation, in order to explore the clinical s
Externí odkaz: https://doaj.org/article/cd40e877281e487ebeb2087d90f56f74
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4
Akademický článek
Associations between smoke exposure and osteoporosis or osteopenia in a US NHANES population of elderly individuals
Autor: Wenyuan Hou, Shaoqi Chen, Caiyu Zhu, Yifan Gu, Lei Zhu, Zhengxin Zhou
Publikováno v: Frontiers in Endocrinology, Vol 14 (2023)
BackgroundTobacco exposure is considered to be a risk factor for reduced bone mineral density (BMD), which may result in osteopenia. Cotinine, a metabolite of nicotine, is commonly utilized as a marker of tobacco exposure. Nevertheless, there are lim
Externí odkaz: https://doaj.org/article/e5d382f6808643e4a885a96c38267db7
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5
Akademický článek
On the composition conjecture for a class of rigid systems
Autor: Zhengxin Zhou, Yuexin Yan
Publikováno v: Electronic Journal of Qualitative Theory of Differential Equations, Vol 2019, Iss 95, Pp 1-22 (2019)
In this paper, we prove that for a class of rigid systems the Composition Conjecture is correct. We show that the Moments Condition is the sufficient and necessary conditions for these rigid systems to have a center at origin point. By the obtained c
Externí odkaz: https://doaj.org/article/9d6d6323ee9841e1b3c34bac34ad6492
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7
Akademický článek
The center problem and the composition condition for a family of quartic differential systems
Autor: Zhengxin Zhou, Valery Romanovski
Publikováno v: Electronic Journal of Qualitative Theory of Differential Equations, Vol 2018, Iss 15, Pp 1-17 (2018)
In this paper we give coefficient conditions for existence of a center in a family of planar quartic polynomial differential systems. We also show that for all considered center cases the Composition Condition is satisfied.
Externí odkaz: https://doaj.org/article/7fd9d01e9f7a446cb52196a9b5f6d223
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