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    Wyświetlanie 1-15 z 15
    Tytuł:
    Positive solutions for the one-dimensional p-Laplacian with nonlinear boundary conditions
    Autorzy:
    Hai, D. D.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/255386.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    p-Laplacian
    semipositone
    nonlinear boundary conditions positive solutions
    Opis:
    We prove the existence of positive solutions for the p-Laplacian problem [formula] where [formula] can be nonlinear, i=1,2 , f:(0,∞)→R is p-superlinear or p-sublinear at ∞ and is allowed be singular (±∞) at 0, and λ is a positive parameter.
    Źródło:
    Opuscula Mathematica; 2019, 39, 5; 675-689
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positive solutions of boundary value problems with nonlinear nonlocal boundary conditions
    Autorzy:
    Padhi, S.
    Pati, S.
    Hota, D. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/255207.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    positive solutions
    Leggett-Williams fixed point theorem
    nonlinear boundary conditions
    Opis:
    We consider the existence of at least three positive solutions of a nonlinear first order problem with a nonlinear nonlocal boundary condition given by [formula] where r : [0,1] → [0, ∞) is continuous; the nonlocal points satisfy [formula] the nonlinear function ƒi and [formula] are continuous mappings from [0,1] x [0,∞) → [0,∞) for i = 1,2,... ,m and j = 1, 2,. .. , n respectively, and λ > 0 is a positive parameter.
    Źródło:
    Opuscula Mathematica; 2016, 36, 1; 69-79
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A class of nonlocal parabolic problems occurring in statistical mechanics
    Autorzy:
    Biler, Piotr
    Nadzieja, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/967215.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    nonlinear boundary conditions
    stationary solutions
    existence of solutions
    parabolic-elliptic system
    Opis:
    We consider parabolic equations with nonlocal coefficients obtained from the Vlasov-Fokker-Planck equations with potentials. This class of equations includes the classical Debye system from electrochemistry as well as an evolution model of self-attracting clusters under friction and fluctuations. The local in time existence of solutions to these equations (with no-flux boundary conditions) and properties of stationary solutions are studied.
    Źródło:
    Colloquium Mathematicum; 1993, 66, 1; 131-145
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence and nonexistence of solutions for a model of gravitational interaction of particles, I
    Autorzy:
    Biler, Piotr
    Nadzieja, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/967263.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    nonlinear boundary conditions
    stationary solutions
    global existence of solutions
    parabolic-elliptic system
    Opis:
    We study the existence of stationary and evolution solutions to a parabolic-elliptic system with natural (no-flux) boundary conditions describing the gravitational interaction of particles.
    Źródło:
    Colloquium Mathematicum; 1993, 66, 2; 319-334
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence and nonexistence of solutions for a model of gravitational interaction of particles, II
    Autorzy:
    Biler, Piotr
    Hilhorst, Danielle
    Nadzieja, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/967183.pdf
    Data publikacji:
    1994
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    nonlinear boundary conditions
    blowing-up solutions
    global existence of solutions
    parabolic-elliptic system
    Opis:
    We study the existence and nonexistence in the large of radial solutions to a parabolic-elliptic system with natural (no-flux) boundary conditions describing the gravitational interaction of particles. The blow-up of solutions defined in the n-dimensional ball with large initial data is connected with the nonexistence of radial stationary solutions with a large mass.
    Źródło:
    Colloquium Mathematicum; 1994, 67, 2; 297-308
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear multivalued boundary value problems
    Autorzy:
    Bader, Ralf
    Papageorgiou, Nikolaos
    Powiązania:
    https://bibliotekanauki.pl/articles/729304.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    usc and lsc multifunction
    measurable selection
    Leray-Schauder alternative theorem
    Sobolev space
    compact embedding
    maximal monotone map
    coercive map
    surjective map
    convex and nonconvex problem
    nonlinear boundary conditions
    Opis:
    In this paper, we study nonlinear second order differential inclusions with a multivalued maximal monotone term and nonlinear boundary conditions. We prove existence theorems for both the convex and nonconvex problems, when $domA ≠ ℝ^{N}$ and $domA = ℝ^{N}$, with A being the maximal monotone term. Our formulation incorporates as special cases the Dirichlet, Neumann and periodic problems. Our tools come from multivalued analysis and the theory of nonlinear monotone operators.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 1; 127-148
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady mixed convection nonlinear radiative Casson nanofluid flow with convective boundary condition, heat source and inclined magnetic field effects
    Autorzy:
    Unyong, Bundit
    Govindaraju, Mathialagan
    Gunasekaran, Nallappan
    Vadivel, Rajarathinam
    Powiązania:
    https://bibliotekanauki.pl/articles/2141509.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Casson nanofluid
    inclined magnetic field
    convective boundary conditions
    nonlinear thermal radiation
    Opis:
    In this paper, we have studied the effect of heat source/sink on unsteady Casson nanofluid past a stretching surface with mixed convection inclined magnetic field and nonlinear thermal radiation numerically. Brownian and thermophoresis effects are studied in this nanofluid model (Buongiorno’s). The governing momentum, energy, and concentration equations are PDEs that are changed into ordinary differential equations by means of suitable transformations. The fourth-order R-K method with shooting technique is adapted to yield the results of this work. The velocity, thermal, and concentration profiles are discussed with the several physical parameters. Also, skin friction, the Nusselt number, and the Sherwood number are examined with the help of the table. It is found that the enhancing value of the unsteady parameter and heat sink parameters reduce the fluid temperature, and the enhancing value of the Casson parameter and heat source parameters increase the fluid temperature. The increasing value of the inclined magnetic field parameter enhances the thermal boundary layer thickness.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 65-76
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A singular nonlinear boundary value problem with Neumann conditions
    Autorzy:
    Janus, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/255233.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    singular nonlinear boundary value problem
    Neumann boundary conditions
    second order equations
    maximal and minimal solutions
    Opis:
    We study the existence of solutions for the equations x" plmin g(t, x) = h(t), t mem (0, 1) with Neumann boundary conditions, where g: [0, 1] x (0, +infin) arr [0, +infin] and h: [0, 1] arr R are continuous and g(t, ·) is singular at 0 for each t mem [0, 1].
    Źródło:
    Opuscula Mathematica; 2005, 25, 2; 227-241
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Impedance Boundary Conditions applied to solving nonlinear electrodynamic systems
    Autorzy:
    Pawłowski, S.
    Plewako, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141489.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear electrodynamics
    Surface Impedance Boundary Conditions
    harmonic fields
    quasi-stationary fields
    skin effect
    Opis:
    The paper presents a method for solving electromagnetic field problems by applying impedance boundary conditions for systems including conducting bodies of nonlinear magnetic properties in an excited harmonic field. Three types of impedance boundary conditions were derived. A procedure for computing surface impedance based on the transfer matrix is proposed. This procedure has been tested by comparing computational results to calculations where time function distortions were considered, and to the experimental data.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 2; 433-446
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boundary value problems for nonlinear fractional differential equations and inclusions with nonlocal and fractional integral boundary conditions
    Autorzy:
    Ntouyas, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/254690.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fractional differential equations
    fractional differential inclusions
    nonlocal conditions
    fractional integral boundary conditions
    existence
    contraction principle
    nonlinear contraction
    Opis:
    This paper studies the boundary value problem of nonlinear fractional differential equations and inclusions of order q ∈ (1, 2] with nonlocal and integral boundary conditions. Some new existence and uniqueness results are obtained by using fixed point theorems.
    Źródło:
    Opuscula Mathematica; 2013, 33, 1; 117-138
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Earthquake analysis of arch dams including the effects of foundation discontinuities and proper boundary conditions
    Autorzy:
    Ferdousi, A.
    Mostafa Gharabaghi, A. R.
    Ahmadi, M. T.
    Chenaghlou, M. R.
    Emami Tabrizi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279306.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    concrete arch dam
    non-homogeneous and discontinuous rock foundation
    nonlinear dynamic analysis
    boundary conditions
    Opis:
    The interaction between dam foundation and rocks plays a significant role in the design and analysis of concrete arch dams. In the current study, comprehensive dynamic analysis of the dam-reservoir-foundation system is performed by developing a non-linear finite element program. The objective of this paper is to study the seismic behavior of a concrete arch dam taking into account the effects of foundation discontinuities and foundation inhomogeneity on the stability. Proper modeling truncated boundary conditions at the far-end of the foundation and reservoir fluid domain as well as to correctly apply the in-situ stresses for the foundation rock represents field conditions in the model more realistically. In this paper, the nonlinear seismic response of the dam-reservoir-foundation system includes dam-canyon interaction, dam body contraction joint opening, discontinuities (possible sliding planes) of the foundation rock and the failure of the joined rock and concrete materials. The results for the Karun 4 dam as a case study revealed the substantial effect of modeling discontinuities and boundary conditions of the rock foundation under seismic excitation that needs to be considered in the design of new dams and can be applied to seismic safety evaluation of the existing dams.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 579-594
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of second order differential inclusions with four-point integral boundary conditions
    Autorzy:
    Ahmad, Bashir
    Ntouyas, Sotiris
    Powiązania:
    https://bibliotekanauki.pl/articles/729334.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    differential inclusions
    four-point integral boundary conditions
    existence
    nonlinear alternative of Leray Schauder type
    fixed point theorems
    Opis:
    In this paper, we discuss the existence of solutions for a four-point integral boundary value problem of second order differential inclusions involving convex and non-convex multivalued maps. The existence results are obtained by applying the nonlinear alternative of Leray Schauder type and some suitable theorems of fixed point theory.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2011, 31, 2; 137-156
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boundary value problems for n-th order differential inclusions with four-point integral boundary conditions
    Autorzy:
    Ahmad, B.
    Ntouyas, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/255975.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    differential inclusions
    four-point integral boundary conditions
    existence
    nonlinear alternative of Leray Schauder type
    fixed-point theorems
    Opis:
    In this paper, we discuss the existence of solutions for a four-point integral boundary value problem of n-th order differential inclusions involving convex and non-convex multivalued maps. The existence results are obtained by applying the nonlinear alternative of Leray Schauder type and some suitable theorems of fixed point theory.
    Źródło:
    Opuscula Mathematica; 2012, 32, 2; 205-226
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of MHD fluid with second order slip and thermal flow over a nonlinear stretching sheet
    Autorzy:
    Jauhri, Shefali
    Mishra, Upendra
    Powiązania:
    https://bibliotekanauki.pl/articles/2174199.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn magnetyczny
    nanociecz
    metoda Runge-Kutty
    stagnation point flow
    second order slip boundary conditions
    nonlinear stretching sheet
    Runge-Kutta method
    Opis:
    An electrically conducted viscous incompressible nanofluid flow caused by the nonlinear stretching surface with stagnation flow has been investigated numerically. The effect of Brownian motion and thermophoresis on the nanofluid is also incorporated. The governing partial differential equations with nonlinear second order boundary conditions are solved by the fourth order Runge-Kutta technique using MATLAB programming. The effect of the radiation parameter (Rd), stretching parameter (n), Brownian motion parameter (Nb), thermophoresis parameter (Nt) on temperature, velocity and mass transfer are shown graphically. The influence of some of these parameters on the local Nusselt number (−′(0)) and local Sherwood number (−′(0)) are shown by the graphs.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 98--114
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas
    Autorzy:
    Perelomova, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/177071.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    nonlinear acoustics
    acoustic heating in resonators
    Burgers equation
    first type
    second type
    boundary conditions
    acoustic heating in a half-space
    Opis:
    Excitation of the entropy mode in the field of intense sound, that is, acoustic heating, is theoretically considered in this work. The dynamic equation for an excess density which specifies the entropy mode, has been obtained by means of the method of projections. It takes the form of the diffusion equation with an acoustic driving force which is quadratically nonlinear in the leading order. The diffusion coefficient is proportional to the thermal conduction, and the acoustic force is proportional to the total attenuation. Theoretical description of instantaneous heating allows to take into account aperiodic and impulsie sounds. Acoustic heating in a half-space and in a planar resonator is discussed. The aim of this study is to evaluate acoustic heating and determine the contribution of thermal conduction and mechanical viscosity in different boundary problems. The conclusions are drawn for the Dirichlet and Neumann boundary conditions. The instantaneous dynamic equation for variations in temperature, which specifies the entropy mode, is solved analytically for some types of acoustic exciters. The results show variation in temperature as a function of time and distance from the boundary for different boundary conditions.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 321-328
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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