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106 results on '"CHEN Lifeng"'

10. On limit measures and their supports for stochastic ordinary differential equations

Author

Xu, Tianyuan, Chen, Lifeng, and Jiang, Jifa

Subjects
Applied Mathematics, Probability (math.PR), 60H10, 37B35, 60B10, 60F10, 37A50, 37C70, FOS: Mathematics, Dynamical Systems (math.DS), Mathematics - Dynamical Systems, Mathematics - Probability, Analysis
Abstract

This paper studies limit measures of stationary measures of stochastic ordinary differential equations on the Euclidean space and tries to determine which invariant measures of an unperturbed system will survive. Under the assumption for SODEs to admit the Freidlin-Wentzell or Dembo-Zeitouni large deviations principle with weaker compactness condition, we prove that limit measures are concentrated away from repellers which are topologically transitive, or equivalent classes, or admit Lebesgue measure zero. We also preclude concentrations of limit measures on acyclic saddle or trap chains. This illustrates that limit measures are concentrated on Liapunov stable compact invariant sets. Applications are made to the Morse-Smale systems, the Axiom A systems including structural stability systems and separated star systems, the gradient or gradient-like systems, those systems possessing the Poincare-Bendixson property with a finite number of limit sets to obtain that limit measures live on Liapunov stable critical elements, Liapunov stable basic sets, Liapunov stable equilibria and Liapunov stable limit sets including equilibria, limit cycles and saddle or trap cycles, respectively. A number of nontrivial examples admitting a unique limit measure are provided, which include monostable, multistable systems and those possessing infinite equivalent classes., Comment: 37 pages, 12 figures

Published
2023

11. Precise recognition and efficient recovery of Pd(II) from high-level liquid waste by a novel aminothiazole-functionalized silica-based adsorbent

Author

Dong, Haoran, primary, Ning, Shunyan, additional, Li, Zengyuan, additional, Xu, Sizhi, additional, Hu, Fengtao, additional, Gao, Feng, additional, Wang, Youbin, additional, Chen, Lifeng, additional, Yin, Xiangbiao, additional, Fujita, Toyohisa, additional, Hamza, Mohammed F., additional, and Wei, Yuezhou, additional

Published
2024
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24. The domain-separation language network dynamics in resting state support its flexible functional segregation and integration during language and speech processing

Author

Yuan, Binke, primary, Xie, Hui, additional, Wang, Zhihao, additional, Xu, Yangwen, additional, Zhang, Hanqing, additional, Liu, Jiaxuan, additional, Chen, Lifeng, additional, Li, Chaoqun, additional, Tan, Shiyao, additional, Lin, Zonghui, additional, Hu, Xin, additional, Gu, Tianyi, additional, Lu, Junfeng, additional, Liu, Dongqiang, additional, and Wu, Jinsong, additional

Published
2023
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43. Alendronate loaded graphene oxide functionalized collagen sponge for the dual effects of osteogenesis and anti-osteoclastogenesis in osteoporotic rats

Author

Zhou Muran, Jiaming Sun, Liu Shaokai, Fang Huimin, Zeng Yuyang, Zhenxing Wang, Chen Lifeng, and Zhou Chuchao

Subjects
medicine.medical_specialty, 0206 medical engineering, Osteoporosis, Biomedical Engineering, Osteoporotic bone defect, 02 engineering and technology, Article, Biomaterials, Osteoclast, In vivo, Internal medicine, lcsh:TA401-492, medicine, Bone regeneration, lcsh:QH301-705.5, Graphene oxide, Alendronate, biology, Chemistry, Mesenchymal stem cell, Acid phosphatase, 021001 nanoscience & nanotechnology, medicine.disease, biology.organism_classification, 020601 biomedical engineering, Sponge, medicine.anatomical_structure, Endocrinology, lcsh:Biology (General), Self-healing hydrogels, biology.protein, lcsh:Materials of engineering and construction. Mechanics of materials, 0210 nano-technology, Biotechnology
Abstract

Graphene Oxide (GO)-related hydrogels have been extensively studied in hard tissue repair, because GO can not only enhance the mechanical properties of polymers but also promote osteogenic differentiation of mesenchymal stem cells. However, simple GO-related hydrogels are not ideal for the repair of osteoporotic bone defects as the overactive osteoclasts in osteoporosis. Alendronate (Aln) is known to inhibit osteoclasts and may bind to GO through covalent connection. Therefore, delivering Aln in GO-related hydrogels may be effective to repair osteoporotic bone defects. Here, we developed a control-released system which is constructed by collagen (Col)-GO sponges loaded with Aln (Col-GO-Aln) for osteoporotic bone defect repair. In vitro, Col-GO-Aln sponges prolonged the release period of Aln, and the sponge containing 0.05% (w/v) GO released Aln faster than sponge with 0.2% GO. Furthermore, tartrate-resistant acid phosphatase (TRAP) and F-actin staining demonstrated that Col-GO-Aln sponges effectively inhibited osteoclastogenesis of monocyte-macrophages. In vivo, micro-CT scan showed that the volume of newborn bone in defect site by 0.05% GO sponge was nearly three times larger than that of other groups. Moreover, the CT and histological examinations of rat femur proved that Col-GO-Aln sponges decreased the number of osteoclasts and suppressed the systemic bone loss in osteoporotic rats. These findings reveal that the application of GO as carriers of anti-osteoporosis drugs is a viable treatment for osteoporosis. The results also underscore the potential of GO-related hydrogels with Aln-releasing capacity for bone regeneration in osteoporosis., Graphical abstract Image 1, Highlights • Alendronate-loading graphene oxide modified collagen sponge (Col-GO-Aln) exhibit a sustained drug delivery. • Col-GO-Aln sponge showed active anti-osteoclastogenesis and osteogenesis ability in vitro and in situ repair. • Col-GO-Aln sponge achieved a potential systemic resistance to bone loss in osteoporotic rats.

Published
2020

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