共查询到19条相似文献,搜索用时 203 毫秒
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该文研究了一类格竞争系统的双稳周期行波解的存在性.首先,将两种群竞争系统转化为合作系统;其次,构造合作系统的上下解,并建立比较原理,得到当初始函数满足一定条件时,解在无穷远处是收敛的;最后,利用黏性消去法证明系统连接两个稳定周期平衡点的行波解的存在性. 相似文献
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讨论了一类具有扩散项的流行性传染病模型中的行波解的存在性.首先,将对该模型所对应的反应扩散系统的行波解的讨论转化为对二阶常微分系统的上下解的讨论;然后,通过上下解方法建立了这个具有扩散项的传染病模型中行波解的存在性条件,并进一步讨论了扩散因素对行波解的波速的影响,得到被感染人群的流动对病毒的传播有一定的影响. 相似文献
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本文考察一类在有界区域内具有零流边界条件的反应扩散三物种时滞系统.在某些初始值恒为零时,研究解的渐近行为并找到解的渐近行为的充分条件,这一充分条件说明在不同的条件下物种能持续生存或灭亡.再者,当波速相对大时,通过构造上下解证明行波解的存在性. 相似文献
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针对部分种群个体活动而其他个体静止的单种群模型,主要研究了一维格上具有静止阶段的时滞反应扩散系统的行波解的定性性质.在单稳和拟单调的假设条件下,首先,研究了行波解的存在性.其次,证明了行波解的渐近行为、单调性以及唯一性.最后,证明了所有非临界波前解(即波速大于最小波速的波前解)是指数渐近稳定的. 相似文献
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《应用泛函分析学报》2017,(4)
本文主要考虑带有非局部扩散项的反应流动扩散方程行波解的存在性问题.首先,利用Schauder不动点定理和上下解原理得到带有非局部扩散项的反应流动扩散方程行波解的存在性,再将所得的结论应用到带有流动项的Lotka-Volterra竞争模型上,最后,考虑了流动项对繁殖速度的影响.同时,本文得到的存在性结论可以应用到一般的反应流动扩散方程中. 相似文献
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研究一个具有非线性-非局部反应的周期反应扩散系统.利用周期半流的渐近理论来讨论渐近波速c~*和周期行波解的存在性,证明参数c~*也是周期行波解的最小波速,并清晰描述解传播的阈值性质.最后给出渐近波速和最小波速c~*的估计. 相似文献
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研究一类二维空间格上的具有静止阶段的反应扩散系统的整体解,这里整体解指的是定义在整个空间和时间上的古典解.构造合适的下解和上估计式,利用比较原理,并利用连接稳定态和不稳定态的空间不依赖解和具有不同波速与传播方向的行波解,证明了整体解的存在性和一些定性性质. 相似文献
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该文考虑了移动环境下带有非局部扩散项和时滞的反应扩散方程的强迫行波解的存在性和唯一性.首先利用上下解方法和单调迭代原理得到强迫行波解的存在性,其中,该强迫行波解以环境移动的速度来变化.其次,该文结合最大值原理,利用挤压方法得到了该强迫行波解的唯一性.最后,作为该文得到的结论的应用,该文给出了两个经典的模型,一个是带非局部扩散项和时滞的Logistic模型,另一个是带有非局部扩散项和时滞的quasi-Nicholson’s Blowfiles人口模型. 相似文献
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Traveling waves of a nonlocal diffusion SIRS epidemic model with a class of nonlinear incidence rates and time delay
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Weifang Yan 《Journal of Applied Analysis & Computation》2019,9(2):452-474
In this paper, we study the traveling waves of a delayed SIRS epidemic model with nonlocal diffusion and a class of nonlinear incidence rates. When the basic reproduction ratio $\mathscr{R}_0>1$, by using the Schauder''s fixed point theorem associated with upper-lower solutions, we reduce the existence of traveling waves to the existence of a pair of upper-lower solutions. By constructing a pair of upper-lower solutions, we derive the existence of traveling wave solutions connecting the disease-free steady state and the endemic steady state. When $\mathscr{R}_0<1$, the nonexistence of traveling waves is obtained by the comparison principle. 相似文献
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In the one-dimensional space, traveling wave solutions of parabolic differential equations have been widely studied and well characterized. Recently, the mathematical study on higher-dimensional traveling fronts has attracted a lot of attention and many new types of nonplanar traveling waves have been observed for scalar reaction-diffusion equations with various nonlinearities. In this paper, by using the comparison argument and constructing appropriate super- and subsolutions, we study the existence, uniqueness and stability of threedimensional traveling fronts of pyramidal shape for monotone bistable systems of reaction-diffusion equations in R3. The pyramidal traveling fronts are characterized as either a combination of planar traveling fronts on the lateral surfaces or a combination of two-dimensional V-form waves on the edges of the pyramid. In particular, our results are applicable to some important models in biology, such as Lotka-Volterra competition-diffusion systems with or without spatio-temporal delays, and reaction-diffusion systems of multiple obligate mutualists. 相似文献
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In this paper the minimal-speed determinacy of traveling wave fronts of a two-species competition model of diffusive Lotka–Volterra type is investigated. First, a cooperative system is obtained from the classical Lotka–Volterra competition model. Then, we apply the upper-lower solution technique on the cooperative system to study the traveling waves as well as its minimal-speed selection mechanisms: linear or nonlinear. New types of upper and lower solutions are established. Previous results for the linear speed selection are extended, and novel results on both linear and nonlinear selections are derived. 相似文献
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We obtain some existence results for traveling wave fronts and slowly oscillatory spatially periodic traveling waves of planar lattice differential systems with delay. Our approach is via Schauder's fixed-point theorem for the existence of traveling wave fronts and via S1-degree and equivarant bifurcation theory for the existence of periodic traveling waves. As examples, the obtained abstract results will be applied to a model arising from neural networks and explicit conditions for traveling wave fronts and global continuation of periodic waves will be obtained. 相似文献
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Bo Deng 《Journal of Nonlinear Modeling and Analysis》2019,1(1):27-45
A twisted heteroclinic cycle was proved to exist more than twenty-
five years ago for the reaction-diffusion FitzHugh-Nagumo equations in their
traveling wave moving frame. The result implies the existence of infinitely
many traveling front waves and infinitely many traveling back waves for the
system. However efforts to numerically render the twisted cycle were not fruit-
ful for the main reason that such orbits are structurally unstable. Presented
here is a bisectional search method for the primary types of traveling wave solu-
tions for the type of bistable reaction-diffusion systems the FitzHugh-Nagumo
equations represent. The algorithm converges at a geometric rate and the wave
speed can be approximated to significant precision in principle. The method
is then applied for a recently obtained axon model with the conclusion that
twisted heteroclinic cycle maybe more of a theoretical artifact. 相似文献
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This paper is concerned with the existence, monotonicity, asymptotic behavior and uniqueness of traveling wave solutions for a three-species competitive–cooperative system with nonlocal dispersal and bistable dynamics. By considering a related truncated problem, we first establish the existence and strict monotonicity of traveling waves by means of a limiting argument and a comparative lemma. Then the asymptotic behavior of traveling waves is investigated by using Ikehara’s lemma and bilateral Laplace transform. Finally, we obtain the uniqueness of wave speed and traveling wave by sliding method. 相似文献
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Jong-Shenq Guo 《Journal of Differential Equations》2009,246(10):3818-2189
We study the traveling waves for a lattice dynamical system with monostable nonlinearity in periodic media. It is well known that there exists a minimal wave speed such that a traveling wave exists if and only if the wave speed is above this minimal wave speed. In this paper, we first derive a stability theorem for certain waves of non-minimal speed. Moreover, we show that wave profiles of a given speed are unique up to translations. 相似文献
19.
Shuxia Pan 《Journal of Mathematical Analysis and Applications》2008,346(2):415-424
This paper is concerned with the existence of traveling wave fronts for delayed non-local diffusion systems without quasimonotonicity, which can not be answered by the known results. By using exponential order, upper-lower solutions and Schauder's fixed point theorem, we reduce the existence of monotone traveling wave fronts to the existence of upper-lower solutions without the requirement of monotonicity. To illustrate our results, we establish the existence of traveling wave fronts for two examples which are the delayed non-local diffusion version of the Nicholson's blowflies equation and the Belousov-Zhabotinskii model. These results imply that the traveling wave fronts of the delayed non-local diffusion systems without quasimonotonicity are persistent if the delay is small. 相似文献