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Search Results: 1 - 10 of 42624 matches for " Jingjun Xu "
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Rational thinkings on the universities’ “special group” students’ physical education curriculum design  [PDF]
Jingjun Han
Health (Health) , 2013, DOI: 10.4236/health.2013.56144
Abstract:

To conduct this study, the literatures, questionnaires, interviews and other methods were used, the analysis of the present situation and health status of the students’ physical education in universities “special group”, and the nature of the course and teaching modes of thinking were also done in order to provide references to improve sports education in colleges and universities.

Nonlinear Stability and D-Convergence of Additive Runge-Kutta Methods for Multidelay-Integro-Differential Equations
Haiyan Yuan,Jingjun Zhao,Yang Xu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/854517
Abstract: This paper is devoted to the stability and convergence analysis of the Additive Runge-Kutta methods with the Lagrangian interpolation (ARKLMs) for the numerical solution of multidelay-integro-differential equations (MDIDEs). GDN-stability and D-convergence are introduced and proved. It is shown that strongly algebraically stability gives D-convergence, DA- DAS- and ASI-stability give GDN-stability. A numerical example is given to illustrate the theoretical results.
Some Stability and Convergence of Additive Runge-Kutta Methods for Delay Differential Equations with Many Delays
Haiyan Yuan,Jingjun Zhao,Yang Xu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/456814
Abstract: This paper is devoted to the stability and convergence analysis of the additive Runge-Kutta methods with the Lagrangian interpolation (ARKLMs) for the numerical solution of a delay differential equation with many delays. GDN stability and D-Convergence are introduced and proved. It is shown that strongly algebraically stability gives D-Convergence DA, DAS, and ASI stability give GDN stability. Some examples are given in the end of this paper which confirms our results.
Recent Advances in the Photorefraction of Doped Lithium Niobate Crystals
Yongfa Kong,Shiguo Liu,Jingjun Xu
Materials , 2012, DOI: 10.3390/ma5101954
Abstract: The recent advances in the photorefraction of doped lithium niobate crystals are reviewed. Materials have always been the main obstacle for commercial applications of photorefractive holographic storage. Though iron-doped LiNbO 3 is the mainstay of holographic data storage efforts, several shortcomings, especially the low response speed, impede it from becoming a commercial recording medium. This paper reviews the photorefractive characteristics of different dopants, especially tetravalent ions, doped and co-doped LiNbO 3 crystals, including Hf, Zr and Sn monodoped LiNbO 3, Hf and Fe, Zr and Fe doubly doped LiNbO 3, Zr, Fe and Mn, Zr, Cu and Ce triply doped LiNbO 3, Ru doped LiNbO 3, and V and Mo monodoped LiNbO 3. Among them, Zr, Fe and Mn triply doped LiNbO 3 shows excellent nonvolatile holographic storage properties, and V and Mo monodoped LiNbO 3 has fast response and multi-wavelength storage characteristics.
Stability and Convergence of an Effective Finite Element Method for Multiterm Fractional Partial Differential Equations
Jingjun Zhao,Jingyu Xiao,Yang Xu
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/857205
Abstract:
Nonlinear optical properties and superluminal propagation in the ruby
Feng Gao,JingJun Xu,GuoQuan Zhang,WenDing Zhang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0221-4
Abstract: In this review article, we summarized the study of the weak light nonlinear properties associated with group velocity change in the ruby. The ruby could be reduced to a two-level system, in which population oscillations could lead to a subluminal result. With the modulated TEM00 beam introduced into the ruby, self-phase modulation together with Fraunhofer diffractions and nondegenerate two-wave coupling between different spatial frequency components of the beam occurs at the same time. Population oscillations, self-phase modulation together with Fraunhofer diffractions and nondegenerate two-wave coupling mechanism competes with each other, which brings a new phenomenon of self-superluminal group velocity propagation in the ruby.
The strong cross relaxation of Er3+ and yb3+ ions in the oxyfluoride glass ceramics
Guangyin Zhang,Lijuan Zhao,Yanbing Hou,Jingjun Xu,Meiru Shang
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02886192
Abstract: Oxyfluoride glass ceramic is a new up-conversion fluorescent material with the low phonon energy just like fluoride and the good mechanical stability like oxide. In the oxyfluoride glass ceramics co-doped with Er3+ and yb3+ ions, the red radiation is dominant while it is excited by the violet light. But in the general fluorescent material, the green radiation is dominant because the multi-phonon relaxation occurs step by step. The strong cross relaxation process of Er3+ and yb3+ ions is mainly responsible for enhancement of the red radiation intensity in the oxyfluoride glass ceramics. The increase of the red radiation intensity of Er3+ ions by the violet light excitation shows that the rare earth ions are doped into fluoride micro-crystals which are planted into oxide host in the oxyfluoride glass ceramics.
Stability of One-leg θ-methods for Volterra Delay Integral Equations
Volterra型时滞积分方程单支θ -方法的稳定性

Xu Yang,Zhao Jingjun,
徐阳
,赵景军

数学物理学报(A辑) , 2008,
Abstract: 考虑Volterra型时滞积分方程单支θ-方法的稳定性质.证明当θ=1时数值方法将保持此时滞系统解析解相应的稳定性,进一步描绘了向后Euler方法的稳定区域.
Nonlinear optical properties and superluminal propagation in the ruby

Feng Gao,JingJun Xu,GuoQuan Zhang,WenDing Zhang,

科学通报(英文版) , 2010,
Abstract: In this review article,we summarized the study of the weak light nonlinear properties associated with group velocity change in the ruby.The ruby could be reduced to a two-level system,in which population oscillations could lead to a subluminal result.With the modulated TEM00 beam introduced into the ruby,self-phase modulation together with Fraunhofer diffractions and nondegenerate two-wave coupling between different spatial frequency components of the beam occurs at the same time.Population oscillations,sel...
Plasmon-phonon coupled modes in graphene tuned by the carrier concentration of the semiconductor substrates
Lei Wang,Wei Cai,Xinzheng Zhang,Jingjun Xu
Physics , 2014,
Abstract: The interaction between graphene plasmons and surface phonons of a semiconductor substrate is investigated, which can be efficiently controlled by the carrier injection of the substrate. The energy and lifetime of surface phonons in a substrate depend a lot on the carrier concentration, which provides a new machanism to tune plasmon-phonon coupled modes (PPCMs). More specifically, the dispersion and lifetime of PPCMs can be controlled by the carrier concentration change of the substrate. The energy of PPCMs for a given momentum increases as the carrier concentration of a substrate increases. On the other hand, the momentum of PPCMs for a given energy decreases when the carrier concentration of the substrate increases. Lifetime of PPCMs is always larger than the intrinsic lifetime of graphene plasmons without plasmon-phonon coupling.
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