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    Wyświetlanie 1-12 z 12
    Tytuł:
    Dispersion estimates for spherical Schrödinger equations: the effect of boundary conditions
    Autorzy:
    Holzleitner, M.
    Kostenko, A.
    Teschl, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/255331.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Schrödinger equation
    dispersive estimates
    scattering
    Opis:
    We investigate the dependence of the [formula] dispersive estimates for one-dimensional radial Schrödinger operators on boundary conditions at 0. In contrast to the case of additive perturbations, we show that the change of a boundary condition at zero results in the change of the dispersive decay estimates if the angular momentum is positive, l ∈ (0,1/2). However, for nonpositive angular momenta, l ∈ (—1/2,0], the standard [formula] decay remains true for all self-adjoint realizations.
    Źródło:
    Opuscula Mathematica; 2016, 36, 6; 769-786
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence results and a priori estimates for solutions of quasilinear problems with gradient terms
    Autorzy:
    Filippucci, Roberta
    Lini, Chiara
    Powiązania:
    https://bibliotekanauki.pl/articles/255859.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    existence result
    quasilinear problems
    a priori estimates
    Opis:
    In this paper we establish a priori estimates and then an existence theorem of positive solutions for a Dirichlet problem on a bounded smooth domain in [formula] with a nonlinearity involving gradient terms. The existence result is proved with no use of a Liouviiie theorem for the limit problem obtained via the usual blow up method, in particular we refer to the modified version by Ruiz. In particular our existence theorem extends a result by Lorca and Ubilla in two directions, namely by considering a nonlinearity which includes in the gradient term a power of u and by removing the growth condition for the nonlinearity ∫ at u = 0.
    Źródło:
    Opuscula Mathematica; 2019, 39, 2; 195-205
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudospectral method for semilinear partial functional differential equations
    Autorzy:
    Czernous, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/255893.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    pseudospectral collocation
    CFS condition
    convergence
    error estimates
    Opis:
    We present a convergence result for two spectral methods applied to an initial boundary value problem with functional dependence of Volterra type. Explicit condition of Courant-Friedrichs-Levy type is assumed on time step τ and the number N of collocation points. Stability statements and error estimates are written using continuous norms in weighted Jacobi spaces.
    Źródło:
    Opuscula Mathematica; 2010, 30, 2; 133-145
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uniqueness of solutions of a generalized Cauchy problem for a system of first order partial functional differential equations
    Autorzy:
    Netka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/952848.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    functional differential equations
    comparison methods
    nonlinear estimates of Perron type
    Opis:
    The paper is concerned with weak solutions of a generalized Cauchy problem for a nonlinear system of first order differential functional equations. A theorem on the uniqueness of a solution is proved. Nonlinear estimates of the Perron type are assumed. A method of integral functional inequalities is used.
    Źródło:
    Opuscula Mathematica; 2009, 29, 1; 69-79
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some remarks on the coincidence set for the Signorini problem
    Autorzy:
    Benito Delgado de, Miguel
    Diaz, Jesus Ildefonso
    Powiązania:
    https://bibliotekanauki.pl/articles/255769.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Signorini problem
    coincidence set
    location estimates
    free boundary problem
    contact problems
    Opis:
    We study some properties of the coincidence set for the boundary Signorini problem, improving some results from previous works by the second author and collaborators. Among other new results, we show here that the convexity assumption on the domain made previously in the literature on the location of the coincidence set can be avoided under suitable alternative conditions on the data.
    Źródło:
    Opuscula Mathematica; 2019, 39, 2; 145-157
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Singular quasilinear convective systems involving variable exponents
    Autorzy:
    Moussaoui, Abdelkrim
    Nabab, Dany
    Vélin, Jean
    Powiązania:
    https://bibliotekanauki.pl/articles/29519640.pdf
    Data publikacji:
    2024
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    p(x)-Laplacian
    variable exponents
    fixed point
    singular system
    gradient estimates
    regularity
    Opis:
    The paper deals with the existence of solutions for quasilinear elliptic systems involving singular and convection terms with variable exponents. The approach combines the sub-supersolutions method and Schauder’s fixed point theorem.
    Źródło:
    Opuscula Mathematica; 2024, 44, 1; 105-134
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical approximations of difference functional equations and applications
    Autorzy:
    Kamont, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255105.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    functional differential equations
    stability and convergence
    interpolating operators
    nonlinear estimates of Perron type
    Opis:
    We give a theorem on the error estimate of approximate solutions for difference functional equations of the Volterra type. We apply this general result in the investigation of the stability of difference schemes generated by nonlinear first order partial differential functional equations and by parabolic problems. We show that all known results on difference methods for initial or initial boundary value problems can be obtained as particular cases of this general and simple result. We assume that the right hand sides of equations satisfy nonlinear estimates of the Perron type with respect to functional variables.
    Źródło:
    Opuscula Mathematica; 2005, 25, 1; 109-130
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classical solutions of mixed problems for quasilinear first order PFDEs on a cylindrical domain
    Autorzy:
    Czernous, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/255887.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    partial functional differential equations
    classical solutions
    local existence
    characteristcs
    cylindrical domain
    a priori estimates
    Opis:
    We abandon the setting of the domain as a Cartesian product of real intervals, customary for first order PFDEs (partial functional differential equations) with initial boundary conditions. We give a new set of conditions on the possibly unbounded domain Ω with Lipschitz differentiable boundary. Well-posedness is then reliant on a variant of the normal vector condition. There is a neighbourhood of ∂Ω with the property that if a characteristic trajectory has a point therein, then its every earlier point lies there as well. With local assumptions on coefficients and on the free term, we prove existence and Lipschitz dependence on data of classical solutions on (0,c)×Ω to the initial boundary value problem, for small c. Regularity of solutions matches this domain, and the proof uses the Banach fixed-point theorem. Our general model of functional dependence covers problems with deviating arguments and integro-differential equations.
    Źródło:
    Opuscula Mathematica; 2014, 34, 2; 291-310
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference methods for infinite systems of hyperbolic functional differential equations on the Haar pyramid
    Autorzy:
    Jaruszewska-Walczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2050179.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    initial problems
    infinite systems of differential functional equations
    difference functional inequalities
    nonlinear estimates of Perron type
    Opis:
    We consider the Cauchy problem for infinite system of differential functional equations $\partial_{t}z_{k}(t, x) = f_{k}(t, x, z, \partial_{x}z_{k}(t, x)), k \in \mathbf{N}$. In the paper we consider a general class of difference methods for this problem. We prove the convergence of methods under the assumptions that given functions satisfy the nonlinear estimates of the Perron type with respect to functional variables. The proof is based on functional difference inequalities. We constructed the Euler method as an example of difference method.
    Źródło:
    Opuscula Mathematica; 2004, 24, 1; 85-96
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference functional inequalities and applications
    Autorzy:
    Szafrańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/255602.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    initial boundary value problems
    difference functional inequalities
    difference methods
    stability and convergence
    interpolating operators
    error estimates
    Opis:
    The paper deals with the difference inequalities generated by initial boundary value problems for hyperbolic nonlinear differential functional systems. We apply this result to investigate the stability of constructed difference schemes. The proof of the convergence of the difference method is based on the comparison technique, and the result for difference functional inequalities is used. Numerical examples are presented.
    Źródło:
    Opuscula Mathematica; 2014, 34, 2; 405-423
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence, uniqueness and estimates of classical solutions to some evolutionary system
    Autorzy:
    Sapa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/255005.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    hyperbolic wave equation
    telegraph equation
    system of nonlinear equations
    existence
    uniqueness and estimates of solutions
    Hölder space
    Opis:
    The theorem of the local existence, uniqueness and estimates of solutions in Hölder spaces for some nonlinear differential evolutionary system with initial conditions is formulated and proved. This system is composed of one partial hyperbolic second-order equation and an ordinary subsystem with a parameter. In the proof of the theorem we use the Banach fixed-point theorem, the Arzeli-Ascola lemma and the integral form of the differential problem.
    Źródło:
    Opuscula Mathematica; 2015, 35, 6; 935-956
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference problems generated by infinite systems of nonlinear parabolic functional differential equations with the Robin conditions
    Autorzy:
    Czernous, W.
    Jaruszewska-Walczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/255694.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    nonlinear parabolic equations
    functional differential equations
    infinite systems
    Volterra type operators
    nonlinear estimates of Perron type
    truncation methods
    Opis:
    We consider the classical solutions of mixed problems for infinite, countable systems of parabolic functional differential equations. Difference methods of two types are constructed and convergence theorems are proved. In the first type, we approximate the exact solutions by solutions of infinite difference systems. Methods of second type are truncation of the infinite difference system, so that the resulting difference problem is finite and practically solvable. The proof of stability is based on a comparison technique with nonlinear estimates of the Perron type for the given functions. The comparison system is infinite. Parabolic problems with deviated variables and integro-differential problems can be obtained from the general model by specifying the given operators.
    Źródło:
    Opuscula Mathematica; 2014, 34, 2; 311-326
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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