Temat: absorption problems - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Discrete homing problems
Autorzy:: Lefebvre, M.
Kounta, M
Powiązania:: https://bibliotekanauki.pl/articles/964041.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: optimal control
principle of optimality
absorption problems
Opis:: We consider the so-called homing problem for discrete-time Markov chains. The aim is to optimally control the Markov chain until it hits a given boundary. Depending on a parameter in the cost function, the optimizer either wants to maximize or minimize the time spent by the controlled process in the continuation region. Particular problems are considered and solved explicitly. Both the optimal control and the value function are obtained.
Źródło:: Archives of Control Sciences; 2013, 23, 1; 5-18
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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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