Yulin Normal University

www.ylu.edu.cn
Yulin, China

Yulin Normal University is a four-year undergraduate and multidisciplinary University located in Yulin, Guangxi, China. Wikipedia.


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Liu Q.,Yulin Normal University | Chen Q.,Guangxi Universities
Physica A: Statistical Mechanics and its Applications | Year: 2015

In this paper, the deterministic and stochastic SIRS epidemic models with nonlinear incidence are introduced and investigated. For deterministic system, the basic reproductive number R0 is obtained. Furthermore, if R0≤1, then the disease-free equilibrium is globally asymptotically stable and if R0 >1, then there is a unique endemic equilibrium which is globally asymptotically stable. For stochastic system, to begin with, we verify that there is a unique global positive solution starting from the positive initial value. Then when R0>1, we prove that stochastic perturbations may lead the disease to extinction in scenarios where the deterministic system is persistent. When R0≤1, a result on fluctuation of the solution around the disease-free equilibrium of deterministic model is obtained under appropriate conditions. At last, if the intensity of the white noise is sufficiently small and R0 >1, then there is a unique stationary distribution to stochastic system. © 2015 Elsevier B.V. All rights reserved.


Lin Q.,Yulin Normal University
Brazilian Journal of Microbiology | Year: 2013

γ-Aminobutyric acid (GABA) is a major inhibitory neurotransmitter in central nervous system, and its application in drugs and functional foods has attracted great attention. To enhance production of γ-aminobutyric acid, Lactobacillus rhamnosus YS9, a strain isolated from Chinese traditional fermented food pickled vegetable, was grown under submerged fermentation. Its cultivation conditions were investigated. When culture pH condition was adjusted to the optimal pH of glutamate decarboxylase activity, culture of Lb. rhamnosus YS9 in medium supplemented with 200mMof monosodium glutamate and 200 μM of pyridoxal phosphate (PLP), produced 187 mM of GABA. © 2013, Sociedade Brasileira de Microbiologia.


Liu Y.,Yulin Normal University
Nonlinear Dynamics | Year: 2012

This paper studies the problem of the circuit implementation and the finite-time synchronization for the 4D (four-dimensional) Rabinovich hyperchaotic system. The electronic circuit of 4D hyperchaotic system is designed. It is rigorously proven that global finite-time synchronization can be achieved for hyperchaotic systems which have uncertain parameters. © 2011 Springer Science+Business Media B.V.


Liu Y.,Yulin Normal University
Nonlinear Analysis: Real World Applications | Year: 2012

In this paper, by using the Poincaré compactification in R3, a global analysis of the conjugate Lorenz-type system is presented, including the complete description of its dynamic behavior on the sphere at infinity. Combining analytical and numerical techniques, it is shown that for the parameter value b=0 the system presents an infinite set of singularly degenerate heteroclinic cycles. The chaotic attractors for the system in the case of small b>0 are found numerically, and thus the nearby singularly degenerate heteroclinic cycles. It is hoped that this global study can give a contribution in understanding of the conjugate Lorenz-type system, and will shed some light leading to final revelation of the true geometrical structure and the essence of chaos for the amazing original Lorenz attractor. © 2012 Elsevier Ltd. All rights reserved.


Liu Y.,Yulin Normal University
Nonlinear Dynamics | Year: 2012

In order to further understand a complex three-dimensional (3D) dynamical system showing strange chaotic attractors with two stable node-foci as its only equilibria, we analyze dynamics at infinity of the system. First, we give the complete description of the phase portrait of the system at infinity, and perform a numerical study on how the solutions reach the infinity, depending on the parameter values. Then, combining analytical and numerical techniques, we find that for the parameter value b = 0, the system presents an infinite set of singularly degenerate heteroclinic cycles. It is hoped that these global study can give a contribution in understanding of this unusual chaotic system, and will shed some light leading to final revealing the true geometrical structure and the essence of chaos for the chaotic attractor. © Springer Science+Business Media B.V. 2012.


Zhai W.,Yulin Normal University
Physica B: Condensed Matter | Year: 2014

Electric-field-induced second-harmonic generation in asymmetrical Gaussian potential quantum wells is investigated using the effective mass approximation employing the compact density matrix method and the iterative approach. Our results show that the absolute value, the real part and the imaginary part of second-harmonic generation are greatly affected by the height of the Gaussian potential quantum wells, the range of the Gaussian confinement potential and the applied electric field. The relationship between the absolute value and the imaginary part of second-harmonic generation together with the relationship between the absolute value and the real part of second-harmonic generation is studied. It is found that no matter how the height of the Gaussian potential quantum wells, the range of the Gaussian confinement potential and the applied electric field vary, the resonant peaks of the absolute value of second-harmonic generation do not originate from the imaginary part but from the real part. © 2014 Elsevier B.V.


Huang L.,Yulin Normal University
Energy Procedia | Year: 2011

Research Methods: Using the literature information, discuss research on effect of Beijing post-Olympic sports industry to China's economic development on basis of analyzing the impacts of Olympic Games on host country 's economic development, from the angle of the theory of Olympic economic development. Purpose of research: Hope to offer theoretical basis for reference to China's post-Olympic economic development through the research on the impacts of Olympic Games on host country's economic development. Conclusions: Main industries that Beijing post - Olympic will promote development of China economic are: Sporting Goods Industry, Sports Tourism Industry, Leisure Sports Industry, and the standard of sports consumption and so on. Research Results: Beijing post -Olympic contributes to promote the formation and development of sports industry chain, "Olympic economy" that formed by sports industry will have an important role in promoting China's economic development. © 2011 Published by Elsevier Ltd.


Liu Y.,Yulin Normal University
International Journal of Bifurcation and Chaos | Year: 2011

This paper proves that all the closed orbits (including limit cycles) of the general Lorenz family must be planar, but only to be curves in space based on the technique of classification and identification for the quadratic surface in three-dimensional space. This result indicates that the qualitative property of the closed orbit for the systems is very complicated. We hope that this study would be beneficial for further studies of the dynamically rich chaotic system. © 2011 World Scientific Publishing Company.


Liu Q.,Yulin Normal University
Physica A: Statistical Mechanics and its Applications | Year: 2015

In this paper, a stochastic Lotka-Volterra competitive model with time-dependent delays is investigated. Sufficient conditions for global asymptotic stability of the positive equilibrium are established. The obtained result demonstrates that time-dependent delays have important impacts on the global asymptotic stability of the positive equilibrium of the considered system. © 2014 Published by Elsevier B.V.


Liu X.,Yulin Normal University
Inorganic Chemistry Communications | Year: 2011

The new thioindate-thioantimonate [Co(dien)2]2In 2Sb4S11 (1, dien = diethylenetriamine) was prepared under solvothermal conditions and structurally characterized. 1 consists of 1-D inorganic [In2Sb4S11 4-]n chains constructed by bow-like trimeric [Sb 3S7] units and heterometallic pseudosemicube [In 2SbS4] clusters, and [Co(dien)2]2+ cations as counterions. The intermolecular H-bond interactions between 1-D inorganic [In2Sb4S11 4-]n anion and [Co(dien)2]2+ cation result in a 3-D supramolecular network. © 2010 Elsevier B.V. All rights reserved.

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