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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 46 (1985), S. 571-586 
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N05 ; CR: G1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary This paper presents an existence-comparison theorem and an iterative method for a nonlinear finite difference system which corresponds to a class of semilinear parabolic and elliptic boundary-value problems. The basic idea of the iterative method for the computation of numerical solutions is the monotone approach which involves the notion of upper and lower solutions and the construction of monotone sequences from a suitable linear discrete system. Using upper and lower solutions as two distinct initial iterations, two monotone sequences from a suitable linear system are constructed. It is shown that these two sequences converge monotonically from above and below, respectively, to a unique solution of the nonlinear discrete equations. This formulation leads to a well-posed problem for the nonlinear discrete system. Applications are given to several models arising from physical, chemical and biological systems. Numerical results are given to some of these models including a discussion on the rate of convergence of the monotone sequences.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 51 (1987), S. 381-394 
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N20 ; CR: G1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In the well-known Volterra-Lotka model concerning two competing species with diffusion, the densities of the species are governed by a coupled system of reaction diffusion equations. The aim of this paper is to present an iterative scheme for the steady state solutions of a finite difference system which corresponds to the coupled nonlinear boundary value problems. This iterative scheme is based on the method of upper-lower solutions which leads to two monotone sequences from some uncoupled linear systems. It is shown that each of the two sequences converges to a nontrivial solution of the discrete equations. The model under consideration may have one, two or three nonzero solutions and each of these solutions can be computed by a suitable choice of initial iteration. Numerical results are given for these solutions under both the Dirichlet boundary condition and the mixed type boundary condition.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 40 (1978), S. 107-121 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The purpose of this paper is to present a method for the determination of a solution for a coupled system of first order initial boundary-value problems arising from some biological systems. The physical problem is to determine the suspended and the superficial molecular concentrations of a traced substance passing through an organ containing a tangle of vessels, such as the kidney-ureter system. The approach to the problem is by successive approximation which leads to a recursion formula for the determination of the solution as well as error estimates for the approximations. The recursion formula involves only direct integration which indicates a promising possibility in obtaining numerical results by using a computer. In addition to the determination of a solution, some qualitative analysis of the solution is given. This includes the existence of a unique solution, the continuous dependency of the solution on the data, and the stability problem of a steady-state solution.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 26 (1975), S. 453-461 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Gegenstand der Arbeit ist eine nichtlineare Diffusionsgleichung, welche in der Theorie des Bevölkerungswachstums wie auch in der klassischen Theorie der Diffusion und der Wärmeleitung eine Rolle spielt. Das räumliche Gebiet kann beschränkt oder unbeschränkt sein, und es werden Randbedingungen sowohl vom Dirichletschen wie vom Neumannschen Typus zugelassen. Unter physikalisch sinnvollen Annahmen über die Nichtlinearität der Gleichung wird die Existenz einer eindeutigen positiven und beschränkten Lösung bewiesen, welche mit der Methode der sukzessiven Approximationen konstruiert werden kann. Für gewisse einfache Modellfälle wird eine Rekursionsformel zur Berechnung der Approximationen angegeben. Neben dem Existenzproblem wird auch das asymptotische Verhalten der Lösung sowie die Stabilität der stationären Lösung betrachtet.
    Notes: Summary This paper treats some non-linear diffusion system arising from the population growth as well as the classical diffusion and heat conduction problem. The spatial domain in the diffusion system can be either bounded or unbounded and the boundary condition under consideration includes both Dirichlet and Neumann type conditions. It is shown under some physically reasonable conditions on the non-linear function that the initial boundary value problem has a unique bounded positive solution which can be constructed by the method of successive approximation. In some simple models, a recursion formula for the calculation of the approximation is given. In addition to the existence problem the investigation is devoted to the asymptotic behavior of the solution and the stability of a steady-state solution. Particular attention is given to a model in the population growth and the chemical diffusion system.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical biology 20 (1984), S. 39-57 
    ISSN: 1432-1416
    Keywords: Genetic control models ; reaction ; diffusion equations with delays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Two models for cellular control by repression are developed in this paper. The models use standard theory from compartmental analysis and biochemical kinetics. The models include time delays to account for the processes of transcription and translation and diffusion to account for spatial effects in the cell. This consideration leads to a coupled system of reactiondiffusion equations with time delays. An analysis of the steady-state problem is given. Some results on the existence and uniqueness of a global solution and stability of the steady-state problem are summarized, and numerical simulations showing stability and periodicity are presented. A Hopf bifurcation result and a theorem on asymptotic stability are given for the limiting case of the models without diffusion.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theory of computing systems 7 (1973), S. 25-31 
    ISSN: 1433-0490
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 29 (1978), S. 795-806 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Mit dieser Arbeit wird bezweckt, eine systematische Behandlung eines nichtstationären Strahlungsdiffusionsproblems zu geben, das mathematisch beschrieben werden kann durch ein gekoppeltes System von Integrodifferentialgleichungen mit Anfangs- und Randbedingungen. Wir stellen eine Rekursionsformel für die Berechnung von Näherungslösungen und zugehörigen Fehlerabschätzungen auf und zeigen, dass die Folge dieser Näherungslösungen gegen die eindeutige klassische Lösung konvergiert. Dabei ergibt sich auch ein Existenz- und Eindeutigkeitssatz, Ferner zeigen wir, dass die Lösung stetig von der externen Quelle und den Anfangs- und Randbedingungen abhängt. Zusammen mit dem Existenz- und Eindeutigkeitssatz garantiert uns dies, dass das System im Sinne von Hadamard wohldefiniert ist.
    Notes: Abstract The purpose of this paper is to give a systematic treatment for a non-stationary radiation diffusion problem which involves a coupled system of integro-differential equations and some initial and boundary conditions. Using an iterative scheme we obtain a recursion formula for the calculation of approximate solutions as well as their error estimates. It is shown that the sequence of approximations converges to a unique classical solution which also leads to an existence-uniqueness theorem. In addition, we show that the solution is positive and depends continuously on the external source and the initial-boundary data. The latter property together with the existence-uniqueness theorem insure that the system is well-posed in the sense of Hadamard.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 35 (1969), S. 30-46 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 35 (1969), S. 16-29 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 50 (1973), S. 290-302 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The aim of this paper is to give a constructive method for the solution of the Boltzmann equation for neutron transport in a bounded space domain subject to typical boundary and initial conditions. Sufficient conditions are given to insure the existence of a unique solution. The method entails the use of a semiinner product in a Banach space together with successive approximations, and leads to a recursion formula for the calculation of approximate solutions and error estimates. The linearized Boltzmann equation for neutron transport is included as a special case.
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