共查询到20条相似文献,搜索用时 150 毫秒
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定义了再生核空间,在再生核空间中给出了一类带初、边值条件的非线性偏微分方程的数值解法,并给出了算法实例. 相似文献
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A. I. Aristov 《Differential Equations》2018,54(9):1137-1146
The equation ?2u/?t?x + up?u/?x = uq describing a nonstationary process in semiconductors, with parameters p and q that are a nonnegative integer and a positive integer, respectively, and satisfy p + q ≥ 2, is considered in the half-plane (x, t) ∈ ? × (0,∞). All in all, fourteen families of its exact solutions are constructed for various parameter values, and qualitative properties of these solutions are noted. One of these families is defined for all parameter values indicated above. 相似文献
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本文首先讨论了一个非局部边界条件下的抛物型偏微分方程组,通过一个变量替换,使得在更宽松的边界假设条件下证明了解的存在唯一性;然后讨论了一个完全非线性的抛物型方程组,同样,通过变量替换证明了比较原理. 相似文献
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给出了一类带有时滞的偏微分方程.该方程描述得是含有非局部和时滞边界条件的分布参数系统.运用泛函分析和积分方程的理论,证明了方程解的存在唯一性,得到解的解析表达式. 相似文献
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非线性脉冲时滞抛物型偏微分方程的强迫振动性 总被引:8,自引:0,他引:8
考虑一类具强迫项的非线性脉冲时滞抛物型偏微分方程,利用脉冲时滞微分不等式,获得了该类方程的解强迫振动的若干充分判据。 相似文献
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PeriodicSolutionofNonlinearParabolicDifferentialEquationWithTimeLag¥(王克)WangKe(DepartmentofMathematics,NortheastNormalUnivers... 相似文献
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Matania Ben-Artzi Jonathan Goodman Arnon Levy 《Transactions of the American Mathematical Society》2000,352(2):731-751
The equation , , is studied in and in the periodic case. It is shown that the equation is well-posed in and possesses regularizing properties. For nonnegative initial data and the solution decays in as . In the periodic case it tends uniformly to a limit. A consistent difference scheme is presented and proved to be stable and convergent.
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Now at Mathemarics Department, Assiut University Egypt A method is presented to transform parabolic equations to asystem of ordinary differential equations for the solution atthe Chebyshev points. The system may be solved analyticallyor by numerical methods and the Chebyshev coefficients are computed.We have the exact solution of a perturbed problem. 相似文献
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非线性中立抛物型偏微分方程系统的振动性定理 总被引:1,自引:0,他引:1
罗李平 《数学的实践与认识》2009,39(6)
研究一类非线性中立抛物型时滞偏微分方程系统解的振动性质,利用积分不等式和泛函微分方程的某些结果,获得了该类系统在第一类边值条件下所有解振动的若干充分条件.结论充分表明振动是由时滞量引起的. 相似文献
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In this article, we will prove the existence, uniqueness and Hölder regularity of the solution to the fractional stochastic partial differential equation of the form where \(\mathfrak {D}(x,D)\) denotes the Markovian generator of stable-like Feller process, \(f:[0,T]\times \mathbb {R}\times \mathbb {R}\rightarrow \mathbb {R}\) is a measurable function, and \(\frac{\partial ^2 W^H}{\partial t\partial x}(t,x)\) is a double-parameter fractional noise. In addition, we establish lower and upper Gaussian bounds for the probability density of the mild solution via Malliavin calculus and the new tool developed by Nourdin and Viens (Electron J Probab 14:2287–2309, 2009).
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$$\begin{aligned} \frac{\partial }{\partial t}u(t,x)=\mathfrak {D}(x,D)u(t,x)+\frac{\partial f}{\partial x}(t,x,u(t,x))+\frac{\partial ^2 W^H}{\partial t\partial x}(t,x), \end{aligned}$$
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51.Introducti0nSince198O)stheoriesandapplicationsofboundaryelementmethods(BEM)orboundaryintegralmethods(BIM)havemadegreatsuccessesfortheparaboliclnit1alboundaryvalueproblems(seeL1-12j),andtheapproachhasbeenappliedtonumericalsolutionsofinitialboundaryva1ueproblemssuccessfully(seeL1-5j'L8j).Thepropertiesofboundaryelementoperatorshavebeenstudiedbyboundaryintegralmethodsbymanyauthors(see.[4j,L6J'[7j'L12J).Theseresultsprovideabasisforconvergencesanderrorestimatesfornumericalapproximationofbou… 相似文献
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非线性中立抛物型时滞偏微分方程解的振动性质 总被引:6,自引:0,他引:6
讨论一类多滞量非线性中立抛物型时滞偏微分方程解的振动性质 ,获得了其一切解振动的充分条件 ;指出了与普通抛物型偏微分方程质的差异 . 相似文献
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本文讨论拟线性抛物型方程奇异摄动问题的差分解法,在非均匀网格上建立了线性三层差分格式,并证明了在离散的L2范数意义下格式的一致收敛性,最后给出了一些数值例子. 相似文献
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We present an approach to compute optimal control functions in dynamic models based on one-dimensional partial differential algebraic equations (PDAE). By using the method of lines, the PDAE is transformed into a large system of usually stiff ordinary differential algebraic equations and integrated by standard methods. The resulting nonlinear programming problem is solved by the sequential quadratic programming code NLPQL. Optimal control functions are approximated by piecewise constant, piecewise linear or bang-bang functions. Three different types of cost functions can be formulated. The underlying model structure is quite flexible. We allow break points for model changes, disjoint integration areas with respect to spatial variable, arbitrary boundary and transition conditions, coupled ordinary and algebraic differential equations, algebraic equations in time and space variables, and dynamic constraints for control and state variables. The PDAE is discretized by difference formulae, polynomial approximations with arbitrary degrees, and by special update formulae in case of hyperbolic equations. Two application problems are outlined in detail. We present a model for optimal control of transdermal diffusion of drugs, where the diffusion speed is controlled by an electric field, and a model for the optimal control of the input feed of an acetylene reactor given in form of a distributed parameter system. 相似文献
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Fattorini & Russell (1971) proved certain existence resultsconcerning the exact control of a linear parabolic differentialequation. Here a numerical method is given for the solutionof such an exact control problem. It involves discretizing inthe space variable(s) to reduce the original problem to a firstorder system of ordinary differential equations. An A-stableImplicit Runge-Kutta method described by Chipman (1971) is usedto solve this system and hence to obtain numerical values forthe control function. A theoretical error bound is producedin the case of a polynomial control function and a numericaltest is made on the algorithm. 相似文献
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O. V. Drozhzhina 《Computational Mathematics and Modeling》2003,14(4):350-359
The article considers the inverse problem of determining the nonlinear right-hand side of a quasi-linear parabolic equation and proves a uniqueness theorem. A method is proposed for numerical solution of the inverse problem based on parametric representation of the sought coefficient. The inverse problem thus reduces to finding the error-minimizing vector of unknown coefficients of the parametric representation of the sought function. 相似文献