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Search Results: 1 - 10 of 100574 matches for " Yu-Lin Deng "
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Normobaric hypoxia-induced brain damage in wistar rat  [PDF]
Ding-Yu Hu, Qin Li, Bo Li, Rong-Ji Dai, Li-Na Geng, Yu-Lin Deng
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.28092
Abstract: The biochemical indicators of wistar rat under low oxygen concentration, such as brain water content, necrosis, lactic acid and Na+-K+-ATPase, was detected to evaluate normobaric hypoxia-induced brain damage and to investigate the mechanism of wistar rat brain injury. Histopathological changes in brain tissue induced by hypoxia were investigated via hematoxylin and eosin stain (HE). Hypoxia induced factor-1α (HIF-1α) expression in brain was confirmed using immunohistochemistry. The results showed that the level of lactic acid was positively correlated with the degree of hypoxia, while concentration-dependent decrease in total Na+-K+-ATPase activity was observed. Compared with the control group, hypoxia group had a significant difference on brain water content under severe hypoxic conditions, the rate of brain necrosis increased obviously, followed by the increase of lactic acid level and the decrease of Na+-K+-ATPase activity. Histopathological analysis of brain confirmed that there was neuronal cell death in hippocampal gyrus. HIF-1α expression enhanced the hypoxia adaptation capability of the rat model through regulating the expressions of multiple genes. Lactic acid, Na+-K+-ATPase and HIF- 1α played an important role in brain injury as a possible mechanism.
Yu-Lin Zhu,Min Xie,Jie Zheng,Changquan Deng
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808037653
Abstract: The title compound, C15H17FO, was prepared directly from the aldol condensation of cyclooctanone with 4-fluorobenzaldehyde, catalysed by Pd(Ni,Ce) in the presence of trimethylsilyl chloride. The eight-membered ring adopts a boat-chair conformation.
Degradation of watershed ecosystems in China: A review

LI Chun-yan,DENG Yu-lin,

生态学杂志 , 2009,
Abstract: 流域生态系统是尺度较大且更为综合的生态系统类型,具有由自然、社会与经济多组分耦合的复杂性,同时又因其特殊的发育条件与演化进程,受到人为强烈而长期的干扰。因此,近年来,基于流域生态系统功能评估的研究倍受我国学者的关注,尤其是从不同时间和空间尺度对不同类型流域生态系统的退化进行了广泛探索,为流域生态系统的综合管理奠定了有力的理论基础。本文从流域生态系统退化的基本理论和研究方法入手,总结了我国近年来有关流域生态系统退化发生演化机制、退化诊断与分类体系、退化综合评价、监测和预警等方面的研究成果,并藉此提出了该领域今后研究的重点和方向,以期完善流域生态系统退化研究的理论体系和流域综合管理的技术体系。
Role of 5-azacytidine in differentiation of human mesenchymal stem cell sinto cardiomyocytes in vitro

Fang-Ge Deng,Yu-Lin Li,Xiu-Ying Zhang,

老年心脏病学杂志(英文版) , 2009,
Large-time rescaling behaviors of Stokes and Hele-Shaw flows driven by injection
Yu-Lin Lin
Physics , 2009,
Abstract: In this paper, we give a precise description of the rescaling behaviors of global strong polynomial solutions to the reformulation of zero surface tension Hele-Shaw problem driven by injection, the Polubarinova-Galin equation, in terms of Richardson complex moments. From past results, we know that this set of solutions is large. This method can also be applied to zero surface tension Stokes flow driven by injection and a rescaling behavior is given in terms of many conserved quantities as well.
Perturbation theorems for Hele-Shaw flows and their applications
Yu-Lin Lin
Physics , 2010, DOI: 10.1007/s11512-010-0138-9
Abstract: In this work, we give a perturbation theorem for strong polynomial solutions to the zero surface tension Hele-Shaw equation driven by injection or suction, so called the Polubarinova-Galin equation. This theorem enables us to explore properties of solutions with initial functions close to but are not polynomial. Applications of this theorem are given in the suction or injection case. In the former case, we show that if the initial domain is close to a disk, most of fluid will be sucked before the strong solution blows up. In the later case, we obtain precise large-time rescaling behaviors for large data to Hele-Shaw flows in terms of invariant Richardson complex moments. This rescaling behavior result generalizes a recent result regarding large-time rescaling behavior for small data in terms of moments. As a byproduct of a theorem in this paper, a short proof of existence and uniqueness of strong solutions to the Polubarinova-Galin equation is given.
Classification of degree three polynomial solutions to the Polubarinova-Galin equation
Yu-Lin Lin
Mathematics , 2013,
Abstract: The Polubarinova-Galin equation is derived from zero-surface-tension Hele-Shaw flow driven by injection. In this paper, we classify degree three polynomial solutions to the Polubarinova-Galin equation into three categories: global solutions, solutions which can be continued after blow-up and solutions which cannot be continued after blow-up. The coefficient region of the initial functions in each category is obtained.
Some Remarks on the Fermat Equation
Yu-Lin Chou
Mathematics , 2015,
Abstract: This note gives two results neighboring on Fermat's last theorem that in principle induce elementary proofs of Fermat's last theorem; the first one gives a necessary condition for Fermat's last theorem to be false, and the second one divides Fermat's last theorem into exactly three cases and proves one of those.
Non-univalent solutions of the Polubarinova-Galin equation
Bj?rn Gustafsson,Yu-Lin Lin
Mathematics , 2014,
Abstract: We study non-univalent solutions of the Polubarinova-Galin equation, describing the time evolution of the conformal map from the unit disk onto a Hele-Shaw blob of fluid subject to injection at one point. In particular, we tackle the difficulties arising when the map is not even locally univalent, in which case one has to pass to weak solutions developing on a branched covering surface of the complex plane. One major concern is the construction of this Riemann surface, which is not given in advance but has to be constantly up-dated along with the solution. Once the Riemann surface is constructed the weak solution is automatically global in time, but we have had to leave open the question whether the weak solution can be kept simply connected all the time (as is necessary to connect to the Polubarinova-Galin equation). A certain crucial statement, a kind of stability statement for free boundaries, has therefore been left as a conjecture only. Another major part of the paper concerns the structure of rational solutions (as for the derivative of the mapping function). Here we have fairly complete results on the dynamics. Several examples are given.
On the dynamics of roots and poles for solutions of the Polubarinova-Galin equation
Bj?rn Gustafsson,Yu-Lin Lin
Mathematics , 2011,
Abstract: We study the dynamics of roots of f'(z,t), where f(z,t) is a locally univalent polynomial solution of the Polubarinova-Galin equation for the evolution of the conformal map onto a Hele-Shaw blob subject to injection at one point. We give examples of the sometimes complicated motion of roots, but show also that the asymptotic behavior is simple. More generally we allow f'(z,t) to be a rational function and give sharp estimates for the motion of poles and for the decay of the Taylor coefficients. We also prove that any global in time locally univalent solution actually has to be univalent.
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