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Thaiënne A. G. P. Van Dijk, Marc Roche, Xavier Lurton, Ridha Fezzani, Stephen M. Simmons, Sven Gastauer, Peer Fietzek, Chris Mesdag, Laurent Berger, Mark Klein Breteler and Dan R. Parsons
For health and impact studies of water systems, monitoring underwater environments is essential, for which multi-frequency single- and multibeam echosounders are commonly used state-of-the-art technologies. However, the current scarcity of sediment refer...
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Francesco Martellotta, Stefania Liuzzi and Chiara Rubino
Rupestrian churches are spaces obtained from excavation of soft rocks that are frequently found in many Mediterranean countries. In the present paper the church dedicated to Saints Andrew and Procopius, located close to the city of Monopoli in Apulia (It...
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Tongjing Sun, Yabin Wen, Xuegang Zhang, Bing Jia and Mengwei Zhou
Ocean reverberations, a significant interference source in active sonar, arise as a response generated by random scattering at the receiving end, a consequence of randomly distributed clutter or irregular interfaces. Statistical analysis of reverberation...
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Rossella Cottone, Louena Shtrepi, Valentina Serra and Simonetta Lucia Pagliolico
The agricultural activity of pruning olive trees generates waste which, due to long-standing practices and unawareness of the consequences, are burned on site, thereby producing CO2 emissions in the atmosphere. Therefore, in order to prevent environmenta...
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Alexey V. Ermoshkin, Dmitry A. Kosteev, Alexander A. Ponomarenko, Dmitrii D. Razumov and Mikhail B. Salin
Underwater acoustic echosounding for surface roughness parameters retrieval is studied in a frequency band that is relatively new for such purposes. During the described 2-weeks sea experiment, 1?3 kHz tonal pulses were emitted from an oceanographic plat...
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Joanna Maria Kopania, Wojciech Zakrzewicz, Przemyslaw Kubiak, Adam Mrowicki, Michal Glogowski, Jacek Gralewski, Grzegorz Boguslawski, Kamil Wójciak and Patryk Gaj
The primary goal of this research was to study transmission loss and absorption of fluted PVC panels using experimental and theoretical methods. During these studies, the link between panel size, thickness, transmission loss, and absorption was considere...
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Claudia Barile, Caterina Casavola, Giovanni Pappalettera and Paramsamy Kannan Vimalathithan
Assessing the damage evolution in carbon-fiber-reinforced polymer (CFRP) composites is an intricate task due to their complex mechanical responses. The acoustic emission technique (AE) is a non-destructive evaluation tool that is based on the recording o...
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Yaw-Shyan Tsay, Jui-Yen Lin and Faxin Ma
The bass ratio describes the relationship between the reverberation energy in the low frequency region and that of the middle frequency. An appropriate bass ratio can create a warm sound; however, too much bass can influence speech clarity (C50) and work...
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Tomasz Kubacka and Chau Nguyen Dinh
In order to determine the optimal parameters when using an ultrasonic probe to measure cavern geometry when a metal borehole pipe is present, an investigation was firstly carried out on influence of a vertical metal plates with a thickness from 1 mm to 1...
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Nansong Li, Minghui Zhang and Bo Gao
The performance of active sonar detection systems is seriously affected by the reverberation at the bottom of the waveguide in shallow water. In order to improve the performance of active sonar detection, it is necessary to understand the horizontal corr...
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