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Search Results: 1 - 10 of 4644 matches for " Xiafeng Duan "
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The Dynamic Complexity of a Holling Type-IV Predator-Prey System with Stage Structure and Double Delays
Yakui Xue,Xiafeng Duan
Discrete Dynamics in Nature and Society , 2011, DOI: 10.1155/2011/509871
Abstract: We invest a predator-prey model of Holling type-IV functional response with stage structure and double delays due to maturation time for both prey and predator. The dynamical behavior of the system is investigated from the point of view of stability switches aspects. We assume that the immature and mature individuals of each species are divided by a fixed age, and the mature predator only attacks the mature prey. Based on some comparison arguments, sharp threshold conditions which are both necessary and sufficient for the global stability of the equilibrium point of predator extinction are obtained. The most important outcome of this paper is that the variation of predator stage structure can affect the existence of the interior equilibrium point and drive the predator into extinction by changing the maturation (through-stage) time delay. Our linear stability work and numerical results show that if the resource is dynamic, as in nature, there is a window in maturation time delay parameters that generate sustainable oscillatory dynamics.
Higher-Order Numeric Solutions for Nonlinear Systems Based on the Modified Decomposition Method  [PDF]
Junsheng Duan
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.21001

Higher-order numeric solutions for nonlinear differential equations based on the Rach-Adomian-Meyers modified decomposition method are designed in this work. The presented one-step numeric algorithm has a high efficiency due to the new, efficient algorithms of the Adomian polynomials, and it enables us to easily generate a higher-order numeric scheme such as a 10th-order scheme, while for the Runge-Kutta method, there is no general procedure to generate higher-order numeric solutions. Finally, the method is demonstrated by using the Duffing equation and the pendulum equation.

Fiscal Decentralization, Corruption and Urban-Rural Income Inequality: Evidence from China  [PDF]
Longlong Duan
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.54056
Abstract: This paper follows fiscal federalism that a higher degree of fiscal decentralization is always associated with lower corruption and income inequality. There exists a stronger dynamic relationship among fiscal decentralization, corruption and income inequality in developing countries. Based on the panel dataset from 1999 to 2012, this research is focusing on China, showing that it does not exist a simple linear relationship among fiscal decentralization, corruption and urban-rural income inequality, instead, the relationship between fiscal decentralization and urban-rural income inequality is more in line with a specific “U” shape. While the effect of corruption on urban-rural income inequality, it can be gradually weakened as the reform of fiscal decentralization which expands the existed researches made by Mah (2013) and Lessmann (2010).
A Study of Fostering College English Students’ Awareness of Cultural Comparison in Chinese Classrooms  [PDF]
Libin Duan
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.45013
Abstract: The study examines the effectiveness of different culture-oriented approaches to foster college English students’ awareness of cultural comparison in Chinese classrooms. A survey about college students’ status quo in English learning indicates that they are poor in western cultural knowledge, especially lack cultural comparative sense and ability. Therefore, based on the second language acquisition theory and the constructivism theory, the study aims at exploring some effective culture-oriented approaches to develop Chinese college English students’ cross-cultural communication ability. After a term’s experimental teaching in the author’s two classes, and data collection and analysis, it is concluded that the following approaches are effective: duty report, various classroom activities, self-access study, hosting the online instruction, etc.
The Prolongation Structures for the System of the Reaction-Diffusion Type  [PDF]
Xiaojuan Duan
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.51010
Abstract: Equations of the reaction-diffusion type are very well known and have been extensively studied in many research areas. In this paper, the prolongation structures for the system of the reaction-diffusion type are investigated from theory of coverings. The realizations and the classifications of the one-dimensional coverings of the system are researched. And the corresponding conservation law of the one-dimensional Abelian coverings is concluded, which is closely connected with the symmetry of the system by Noether theorem.
Analysis on the Application of PPP Mode in Hangzhou City Management
—Take the Infrastructure Construction as an Example

Zhenpeng Duan
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.512002
Facing the phenomenon that the increasingly serious shortage of infrastructure causes urban problems, the government will introduce PPP mode to the field of city management, and it achieves good economic and social benefits to promote the sustainable development of PPP mode in city management. Based on the survey of Hangzhou Metro Line 1 and the travelling citizens and the analysis of SPSS data, we can know that the operation management of the later stage is the main reason that affects the sustainable development of PPP mode. Based on this, the paper proposes that in the operation management of the later stage, we should strive to improve the relevant supporting facilities and the quality of services, so as to enhance the public’s satisfaction to the project, thereby promoting the sustainable development of PPP mode in city management.
The Redistribution Effect of Social Security System under Birth Control  [PDF]
Xueqin Duan
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.63014
This paper establishes an OLG model to analyze the long-term effect of social security on inequality under birth control. We study the effect of population policy and social security on fertility and education of families with different income. Then this effect determines the evolution of inequality. The analyses suggest that the effect of social security on inequality in the next generation is depended on population policy and the differentiation of family care.
The Effect of Different Intensities of Treadmill Exercise on Cognitive Function Deficit Following a Severe Controlled Cortical Impact in Rats
Xiafeng Shen,Aiping Li,Yuling Zhang,XiaoMin Dong,Tian Shan,Yi Wu,Jie Jia,Yongshan Hu
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141121598
Abstract: Exercise has been proposed for the treatment of traumatic brain injury (TBI). However, the proper intensity of exercise in the early phase following a severe TBI is largely unknown. To compare two different treadmill exercise intensities on the cognitive function following a severe TBI in its early phase, rats experienced a controlled cortical impact (CCI) and were forced to treadmill exercise for 14 days. The results revealed that the rats in the low intensity exercise group had a shorter latency to locate a platform and a significantly better improvement in spatial memory in the Morris water maze (MWM) compared to the control group ( p < 0.05). The high intensity exercise group showed a longer latency and a mild improvement in spatial memory compared to the control group rats in the MWM; however, this difference was not statistically significant ( p > 0.05). The brain-derived neurotrophic factor (BDNF) and p-CREB protein levels in the contralateral hippocampus were increased significantly in the low intensity exercise group. Our results suggest that 2 weeks of low intensity of treadmill exercise is beneficial for improving cognitive function and increasing hippocampal BDNF expression after a severe TBI in its early phase.
Research on the Contents and Indexes of Reservoir Operational Security  [PDF]
Jingchun Feng, Zhongnan Duan
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.211115
Abstract: Reservoirs play an important role in the development of economy and society, as well as the maintenance of ecological balance. The reservoir operational security can make every function of reservoirs fully played. This paper makes a systematic analysis on the meaning of reservoir operational security and builds up a framework system of it from the perspective of organization and system. On this3 basis, the paper researches the contents and indexes of reservoir operational security from the microscopic, intermediate and macroscopic aspects. The results of this paper provide a foundation for further research on reservoir operational security management.
Protecting effect of He-Ne laser on winter wheat from UV-B radiation damage by analyzing proteomic changes in leaves  [PDF]
Zhenhu Jia, Jiangyan Duan
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.48109

The ultraviolet-B (UV-B) radiation can affect gene expression of plant in growth and development. Winter wheat (Triticum aestivum), as a kind of economic crop cultured in the Northern China, is also damaged by present-day ultraviolet-B (UV-B) radiation. It was reported that He-Ne lasers could alleviate cell damage caused by UV-B radiation in plants. To get the proteomic changes of wheat alleviated by He-Ne lasers, we studied protein expression profiles of winter wheat (Jin Mai NO.79) leaves by running 2-DE (two-dimensional gel electrophoresis), which allowed the identification of some significantly different gel spots. The spots were further verified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry, in which they were confirmed to be winter wheat proteins. The results showed: 1) the proteomic changes between the ultraviolet-B radiation group and normal light group were significantly different on sixth day; 2) The expression of some proteins such as catalase, DNA polymerase and reduced glutathione declines at the ultraviolet-B radiation group and increases at the UV-B + He-Ne laser group. This indicates UV-B could regulate genes encoding proteins in Winter wheat leaves and affect the growth of the Winter wheat. He-Ne lasers treatment could significantly alleviate UV-B-induced damage in wheat.

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