Temat: 02.30.Ks - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Critical Fluctuations and 1/f$\text{}^{α}$-Activity of Neural Fields Involving Transmission Delays
Autorzy:: Hutt, A.
Frank, T. D.
Powiązania:: https://bibliotekanauki.pl/articles/2044577.pdf
Data publikacji:: 2005-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.19.La
05.40.Ca
02.30.Ks
05.70.Jk
Opis:: This work studies the stability and the stochastic properties of neural activity evoked by external stimulation. The underlying nonlocal model describes the spatiotemporal response dynamics of neural populations involving both synaptic delay and axonal transmission delay. We show that the linear model recasts to a set of affine delay differential equations in spatial Fourier space. Besides a stability study for general kernels and general external stimulation, the power spectrum of evoked activity is derived analytically in the case of external Gaussian noise. Further applications to specific kernels reveal critical fluctuations at Hopf- and Turing bifurcations and allow the numerical detection of 1/f$\text{}^{α}$fluctuations near the stability threshold.
Źródło:: Acta Physica Polonica A; 2005, 108, 6; 1021-1040
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Acoustic Eigenanalysis with Radial Basis Functions
Autorzy:: Majkut, L.
Olszewski, R.
Powiązania:: https://bibliotekanauki.pl/articles/1197535.pdf
Data publikacji:: 2014-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.30.Mv
43.10.Ks
Opis:: The paper concerns the eigenanalysis of acoustic cavities with the use of radial basis functions (RBF). The Kansa collocation method was used for determination of the natural frequencies and eigenvectors of 1D, 2D and 3D acoustic fields. Due to validation analysis of the proposed method, in simple examples like 1D, 2D rectangle and 3D rectangular parallelepiped all calculated eigenferquency and eigenvectors were compared with exact (analytical) results. All results indicate that using of multiquadric radial basis functions provide a results with very high accuracy in comparison to analytical results. In the paper a new method for determining the shape parameter of the multiquadric radial basis functions is described.
Źródło:: Acta Physica Polonica A; 2014, 125, 4A; A-77-A-83
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Accuracy Issues of Discrete Hilbert Transform in Identification of Instantaneous Parameters of Vibration Signals
Autorzy:: Meissner, M.
Powiązania:: https://bibliotekanauki.pl/articles/1490326.pdf
Data publikacji:: 2012-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.30.Uu
46.40.Ff
43.20.Ks
Opis:: In the paper, an accuracy of the discrete Hilbert transform method in a detection of amplitude and frequency of vibration signals has been examined. This issue was studied for sinusoidal damped vibrations often encountered in practical applications. It has been shown that an inexactness of the Hilbert transform generates fictitious oscillations of amplitude and frequency. For small damping of vibrations these oscillations were significant only at both ends of a discrete signal. An error induced by a numerical algorithm was especially severe for strongly damped vibrations because it manifested itself by a large overestimation of amplitude and erroneous jumps of frequency. To reduce the error generated by the Hilbert transform method, the appropriate modification of discrete signal was proposed.
Źródło:: Acta Physica Polonica A; 2012, 121, 1A; A-164-A-167
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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