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Underwater noise properties in waterway areas of the South Baltic Sea

Jaśniewicz D., Klusek Z., Neves S.

Hydroacoustics

2016

Vol. 19

173--184

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.

Microstructural investigations of the PM superalloy N18 in deformed and undeformed state.

Neves S., Penkalla H.J., Schubert F., Singheiser L.

Inżynieria Materiałowa

1998

R. XIX, nr 3

459-462

In the present work microstructural investigations by means of transmission electron microscopy (TEM) were carried out on the powder metallurgy (PM), nickel-base superalloy N18. The material was characterized in the as-received, hot extruded state as well as after complete heat treatment. Especially the gamma-distribution and the presence of further precipitates were considered. The elemental distribution was characterized with the assistance of energy dispersive X-ray analysis (EDX) and energy filtering (TEM) (EFTEM). Additionally strain rate controlled tensile tests with different strain rates were carried out at 700 degrees centigrade in laboratory air. The microstructure of the deformed material was mainly investigated on dislocation distribution and deformation inhomogeneities.