Temat: Boundary value problems - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Multipliers in Sobolev spaces and exact convergence rate estimates for the finite-difference schemes
Autorzy:: Jovanović, Boško
Powiązania:: https://bibliotekanauki.pl/articles/1361062.pdf
Data publikacji:: 1994
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: finite differences
multipliers
boundary-value problems
Sobolev spaces
Opis:: In this paper we present some recent results concerning convergence rate estimates for finite-difference schemes approximating boundary-value problems. Special attention is given to the problem of minimal smoothness of coefficients in partial differential equations necessary for obtaining the results.
Źródło:: Banach Center Publications; 1994, 29, 1; 165-173
0137-6934
Pojawia się w:: Banach Center Publications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Existence results for delay second order differential inclusions
Autorzy:: Azzam-Laouir, Dalila
Haddad, Tahar
Powiązania:: https://bibliotekanauki.pl/articles/729461.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: boundary-value problems
delay differential inclusions
fixed point
retract
Opis:: In this paper, some fixed point principle is applied to prove the existence of solutions for delay second order differential inclusions with three-point boundary conditions in the context of a separable Banach space. A topological property of the solutions set is also established.
Źródło:: Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2008, 28, 1; 133-146
1509-9407
Pojawia się w:: Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An Influence of the Wall Acoustic Impedance on the Room Acoustics. The Exact Solution
Autorzy:: Brański, A.
Kocan-Krawczyk, A.
Prędka, E.
Powiązania:: https://bibliotekanauki.pl/articles/177084.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Fourier analysis
architectural acoustics
absorption coefficients
boundary-value problems
Opis:: The Fourier method is applied to the description of the room acoustics field with the combination of uniform impedance boundary conditions imposed on some walls. These acoustic boundary conditions are expressed by absorption coefficient values In this problem, the Fourier method is derived as the combination of three one-dimensional Sturm-Liouville (S-L) problems with Robin-Robin boundary conditions at the first and second dimension and Robin-Neumann ones at the third dimension. The Fourier method requires an evaluation of eigenvalues and eigenfunctions of the Helmholtz equation, via the solution of the eigenvalue equation, in all directions. The graphic-analytical method is adopted to solve it It is assumed that the acoustic force constitutes a monopole source and finally the forced acoustic field is calculated. As a novelty, it is demonstrated that the Fourier method provides a useful and efficient approach for a room acoustics with different values of wall impedances. Theoretical considerations are illustrated for rectangular cross-section of the room with particular ratio. Results obtained in the paper will be a point of reference to the numerical calculations.
Źródło:: Archives of Acoustics; 2017, 42, 4; 677-687
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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