|
|
|
|
|
Petr Krysl and Ahmad T. Abawi
Computing backscattering of harmonic acoustic waves from underwater elastic targets of arbitrary shape is a problem of considerable practical significance. The finite element method is commonly applied to the discretization of the target; on the other ha...
ver más
|
|
|
|
|
|
|
|
|
|
|
Petr Krysl and Ahmad T. Abawi
Computing the backscattering of harmonic acoustic waves from underwater elastic targets of arbitrary shapes is a challenging problem of considerable practical significance. The finite element method is well suited for the discretization of the target, wh...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yang Zhang, Qiang Gui, Yuzheng Yang and Wei Li
An efficient graphical acoustic computing (GRACO) method is introduced. Referring to the rendering of semi-transparent objects, the depth peeling (DP) technique is compounded with the GRACO method, forming a combined GRACO and DP method (GRACO?DP) to con...
ver más
|
|
|
|
|
|
|
|
|
|
|
Hyungbeen Lee, Euna Yoon, Seungjong Lee and Jeonghoon Lee
This study was conducted to investigate the acoustic characteristics of largehead hairtails (Trichiurus japonicus) in the Southern Sea of South Korea from April 2022, using 18, 38, 70, 120, and 200 kHz split-beam echosounders. At two stations, juvenile (...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bert Cox, Chesney Buyle, Daan Delabie, Lieven De Strycker and Liesbet Van der Perre
The digital transformation is exciting the uptake of Internet-of-Things technologies, and raises the questions surrounding our knowledge of the positions of many of these things. A review of indoor localization technologies summarized in this paper shows...
ver más
|
|
|
|
|
|
|
|
|
|
|
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...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xiaochen Yu, Jingsheng Zhai, Bo Zou, Qi Shao and Guangchao Hou
The modern discrimination of sediment is based on acoustic intensity (backscatter) information from high-resolution multibeam echo-sounder systems (MBES). The backscattering intensity, varying with the angle of incidence, reveals the characteristics of s...
ver más
|
|
|
|
|
|
|
|
|
|
|
Khurram Naeem, Bok Hyeon Kim, Dong-Jin Yoon and Il-Bum Kwon
We propose a weighted singular value decomposition (WSVD) to reduce the random noise in the Rayleigh backscattering signal of the phase-sensitive optical time domain reflectometry (F-OTDR) to enhance the detection performance of the distributed vibration...
ver más
|
|
|
|
|
|
|
|
|
|
|
Per Lunde
Finite-amplitude (nonlinear) sound propagation effects in seawater may cause measurement errors in fish and zooplankton abundance estimation and species identification for accessible echo sounder transmit electrical power levels and operating frequencies...
ver más
|
|
|
|
|
|
|
|
|
|
|
Denis Chernykh, Vladimir Yusupov, Aleksandr Salomatin, Denis Kosmach, Natalia Shakhova, Elena Gershelis, Anton Konstantinov, Andrey Grinko, Evgeny Chuvilin, Oleg Dudarev, Andrey Koshurnikov and Igor Semiletov
Seeps found offshore in the East Siberian Arctic Shelf may mark zones of degrading subsea permafrost and related destabilization of gas hydrates. Sonar surveys provide an effective tool for mapping seabed methane fluxes and monitoring subsea Arctic perma...
ver más
|
|
|
|
|
|