共查询到20条相似文献,搜索用时 78 毫秒
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1 Introduction Inecology ,apredator preyinteractionofbothpopu lationsinonedimensionisdescribedbythefollowingsystem[1] :ut(x ,t) =uxx uM (u ,v) ,vt(x ,t) =βvxx vN(u ,v) ,(1)whereβisapositiveconstant,uandvarethepreyandpredatordensitiesrespectively ,andthefunctionsMandNare… 相似文献
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混合单调算子方程组解的存在唯一性 总被引:3,自引:0,他引:3
张庆政 《商丘师范学院学报》1999,(6)
利用非线性泛函分析中的锥与半序理论和单调迭代技巧,讨论几类混合单调算子方程组解的存在性和唯一性,对每类算子方程组都给出了几种迭代序列,并研究了各种迭代序列收敛于算子方程组解的误差估计.所得结果改进和拓展了混合单调算子方程的某些相应结果,在非线性泛函分析理论中具有重要意义 相似文献
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混合单调算子方程组解的存在唯一性 总被引:3,自引:0,他引:3
利用非线性泛函分析中的锥与半序理论和单调迭代技巧,讨论几类混合单调算子方程组解的存在性和唯一性,对每类算子方程组都给出了几种迭代序列,并研究了各种迭代序列收敛于算子方程组解的误差估计.所得结果改进和拓展了混合单调算子方程的某些相应结果,在非线性泛函分析理论中具有重要意义. 相似文献
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《黑龙江大学工程学报》2020,(1)
讨论了混合流体对流的流体力学方程组和扰动方程组。基于布辛涅斯克近似,给出了考虑Soret效应和Dufour效应的混合流体对流的基本方程组,对其进行了无因次化处理。给出了基本方程组的无对流运动的传导解。对于混合液体在忽略Dufour效应的情况下,引入扰动物理量,推导了具有水平流动的混合流体对流的扰动方程组。应用扰动方程组可以计算具有水平流动的混合流体对流的稳定性和对流特性。根据不同的简化条件,具有水平流动的混合流体对流的扰动方程组可以变成具有水平流动的单流体对流情况,混合流体对流情况,单流体对流情况,或者单流体水平流动情况的扰动方程组等。如果忽略扰动方程组中二阶以上的高阶项,方程组可简化成线性稳定分析的扰动方程组。 相似文献
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研究了一个带非局部源退化反应扩散方程组初值非负边值为零的Dirichlet问题.在一定的条件下,采用正则化技巧、Schauder估计和Gronwall's不等式证明了古典解的局部存在性和唯一性. 相似文献
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Donghong 《上海大学学报(英文版)》1999,(2)
NomenclatureLetVandZbetworealC∞manifolds,dim.V=n≥2,dim.Z=mandDJk(V,Z)isasystemofk0thorderpartialdiferentialequations.Jk(V,Z... 相似文献
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It is proved that the ill-posed initial value problem of the Euler equations for compressible adiabatic inviscid fluid flow can be only formally solved. The necessary and sufficient conditions for existence of formal solution of some representative ill-posedness initial-boundary value problem are presented. Finally, an example is also given. 相似文献
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QINXinqiang MAYichen GONGChunqiongt 《重庆大学学报(英文版)》2004,3(1):92-96
A two-grid method for solving nonlinear convection-dominated diffusion equations is presented. The method use discretizations based on a characteristic mixed finite-element method and give the linearization for nonlinear systems by twosteps. The error analysis shows that the two-grid scheme combined with the characteristic mixed finite-element method candecrease numerical oscillation caused by dominated convections and solve nonlinear advection-dominated diffusion problemsefficiently. 相似文献
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A two-grid method for solving nonlinear convection-dominated diffusion equations is presented. The method use discretizations based on a characteristic mixed finite-element method and give the linearization for nonlinear systems by two steps. The error analysis shows that the two-grid scheme combined with the characteristic mixed finite-element method can decrease numerical oscillation caused by dominated convections and solve nonlinear advection-dominated diffusion problems efficiently. 相似文献
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鄂国康 《上海大学学报(英文版)》1999,3(1):25-29
1 Introduction Thestochasticdifferentialequations(SDE)areusedinmanyareasofscienceandengineering.ThemainpurposeforsolvingproblemswithSDEistoobtaintheprobabilitydensityfunction(PDF)ofthestatevariablesgovernedbytheSDEbecausemanyotherstatisticalanalysisa… 相似文献
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讨论了一类混合单调算子方程组解的存在唯一性问题,得到了若干不具有连续性和紧性条件的混合单调算子,增算子和减算子新的不动点定理,改进和推广了文[1]-[6]的结果. 相似文献
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讨论了一类混合单调算子方程组解的存在唯一性问题,得到了若干不具有连续性和紧性条件的混合单调算子,增算子和减算子新的不动点定理,改进和推广了文[1]-[6]的结果. 相似文献
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Initial and Boundary Value Problems for Two-Dimensional Non-hydrostatic Boussinesq Equations 总被引:3,自引:0,他引:3
Based on the theory of stratification, the weU-posedness of the initial and boundary value problems for the system of twodimensional non-hydrostatic Boussinesq equations was discussed. The sufficient and necessary conditions of the existence and uniqueness for the solution of the equations were given for some representative initial and boundary value problems. Several special cases were discussed. 相似文献
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n-soliton-like solutions of three non-isospectral equations, the non-isospectral mKdV equation, the non-isospectral sine-Gordon equation and the non-isospeetral nonlinear Schroedinger equation were obtained by using the Hirota method. 相似文献
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利用迭代技巧,讨论了不具有连续性和紧性条件的混合单调算子方程解的存在唯一性,并给出了迭代序列收敛于解的误差估计,所得结果是某些已知结果本质改进和推广. 相似文献