Temat: shallow sea - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The use of the time reverse acoustics in a shallow sea
Autorzy:: Stromkov, A. A.
Powiązania:: https://bibliotekanauki.pl/articles/331672.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: acoustics
shallow sea
TRM
Opis:: In this report the results of theoretical, numerical and experimental analysis of TRM in a shallow sea are submitted. It is shown that in shallow sea the characteristics of focusing depend first of all on the sizes of the array of imaginary sources which essentially exceeds the sizes of any real array. The method of an experimental research of characteristics of TRM is founded only on the receiving elements and a probe sources is offered. The spatial sizes and the form of focal area of TRM are measuired. It is experimentally confirmed the identity of focal area of TRM with one element and the vertical arrays. The estimation of efficiency of such systems is executed.
Źródło:: Hydroacoustics; 2008, 11; 353-363
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Underwater noise properties in waterway areas of the South Baltic Sea
Autorzy:: Jaśniewicz, D.
Klusek, Z.
Neves, S.
Powiązania:: https://bibliotekanauki.pl/articles/331866.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: shipping noise
shallow sea
Opis:: Results of underwater noise records completed with single and multi-hydrophone systems performed in the shallow water in the close vicinity of shipping lanes to the Gdansk/Gdynia and Świnoujście/Szczecin harbours are presented. Due to the fact that the bottom properties, bathymetry, and temporally varying sea surface alter the original sound spectra and reduce the acoustic energy, the sound transmission losses have been modelled, and an attempt to predict source levels of ships was performed. The KRAKEN sound propagation model illustrates the problems of the recognition of sources noise spectra on the basis of observations in a far zone from the sources. On the basis of the observed noise data, jointly with the AIS system the potential ecological effects of anthropogenic underwater noise on marine organisms are given for the Pomeranian Bight. In the paper, some examples of algorithms of ship noise recognition are given.
Źródło:: Hydroacoustics; 2016, 19; 173-184
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Experimental studies of low-frequency acoustic fields in a shallow sea
Autorzy:: Luchinin, A. G.
Powiązania:: https://bibliotekanauki.pl/articles/332794.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: experimental studies
acoustic fields
shallow sea
Opis:: The results of the studies of excitation and propagation of low-frequency acoustic fields in a shallow sea, which have been carried out at the IAP RAS for several years, are discussed. A novel equipment complex designed specially for these experiments and intended for the selective excitation and reception of waveguide modes is described. Examples of measurements of various characteristics of low-order mode acoustic signals are given, which demonstrate high efficiency of the applied equipment and measurement technique.
Źródło:: Hydroacoustics; 2009, 12; 117-126
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki