Results 11 to 20 of about 2,333 (168)

Optimal Automatic Wide-Area Discrimination of Fish Shoals from Seafloor Geology with Multi-Spectral Ocean Acoustic Waveguide Remote Sensing in the Gulf of Maine

Remote Sensing, 2023
Ocean Acoustic Waveguide Remote Sensing (OAWRS) enables fish population density distributions to be instantaneously quantified and continuously monitored over wide areas.
Kaklamanis Eleftherios, Purnima Ratilal, Nicholas C. Makris   +2 more
doaj   +3 more sources

The Effect of Attenuation from Fish on Passive Detection of Sound Sources in Ocean Waveguide Environments

Remote Sensing, 2021
Attenuation from fish can reduce the intensity of acoustic signals and significantly decrease detection range for long-range passive sensing of manmade vehicles, geophysical phenomena, and vocalizing marine life.
Daniel Duane, Chenyang Zhu, Felix Piavsky, Olav Rune Godø, Nicholas C. Makris   +4 more
doaj   +1 more source

Ocean Acoustic Waveguide Remote Sensing (OAWRS) of marine ecosystems [PDF]

Marine Ecology Progress Series, 2009
Abstract : Ocean Acoustic Waveguide Remote Sensing (OAWRS) has recently been shown to becapable of instantaneously imaging and continuously monitoring fish populations over continentalshelf-scale areas, covering thousands of km2. We show how OAWRS can be used in a variety ofoceanic ecosystems to remotely assess populations and study the behavior of ...
Jagannathan, Srinivasan, Bertsatos, Ioannis, Symonds, Deanelle, Chen, Tianrun, Nia, Hadi Tavakoli, Jain, Ankita Deepak, Andrews, Mark, Gong, Zheng, Nero, Redwood, Ngor, Lena, Jech, Mike, Godø, Olav Rune, Lee, Sunwoong, Ratilal, Purnima, Makris, Nicholas   +14 more
openaire   +2 more sources

Rancang Bangun Transmitter dan Receiver untuk Sistem Komunikasi Akustik Bawah Air

Jurnal Rekayasa Elektrika, 2020
Since 2016 acoustic detection technology for marine resources had been developed which was relatively simple and sophisticated, namely Ocean Acoustic Waveguide Remote Sensing.
Henry Manik, Susilohadi Susilohadi, Billi R Kusumah   +2 more
doaj   +1 more source

Probing Gravity Waves in the Middle Atmosphere Using Infrasound From Explosions

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 13, 16 July 2023., 2023
Abstract This study uses low‐frequency, inaudible acoustic waves (infrasound) to probe wind and temperature fluctuations associated with breaking gravity waves (GWs) in the middle atmosphere. Building on an approach introduced by Chunchuzov et al., infrasound recordings are used to retrieve effective sound‐speed fluctuations in an inhomogeneous ...
Ekaterina Vorobeva, Jelle Assink, Patrick Joseph Espy, Toralf Renkwitz, Igor Chunchuzov, Sven Peter Näsholm   +5 more
wiley   +1 more source

Hybrid Metasurfaces for Perfect Transmission and Customized Manipulation of Sound Across Water–Air Interface

Advanced Science, Volume 10, Issue 19, July 6, 2023., 2023
Hybrid metasurfaces are proposed to realize perfect transmission and customized manipulation of sound across the water–air interface. Exploiting the fluid–solid interactions, an inverse‐design strategy based on topology optimization is developed to design the impedance‐matched hybrid metasurfaces.
Hong‐Tao Zhou, Shao‐Cong Zhang, Tong Zhu, Yu‐Ze Tian, Yan‐Feng Wang, Yue‐Sheng Wang   +5 more
wiley   +1 more source

Responses of the AC/DC Global Electric Circuit to Volcanic Electrical Activity in the Hunga Tonga‐Hunga Ha'apai Eruption on 15 January 2022

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 8, 27 April 2023., 2023
Abstract Responses of the AC and DC global electric circuits (GECs) to the large eruption of the Hunga Tonga‐Hunga Ha'apai (HT‐HH) volcano on 15 January 2022 are discussed. The AC‐related investigation is based on Schumann resonance (SR) measurements from six stations on four continents. The DC‐related investigation utilizes atmospheric electric field (
J. Bór, T. Bozóki, G. Sátori, E. Williams, S. A. Behnke, M. J. Rycroft, A. Buzás, H. G. Silva, M. Kubicki, R. Said, C. Vagasky, P. Steinbach, K. Szabóné André, M. Atkinson   +13 more
wiley   +1 more source

Cumulative Effects in 100 kHz Repetition‐Rate Laser‐Induced Plasma Filaments in Air

Advanced Photonics Research, Volume 4, Issue 3, March 2023., 2023
Herein, properties of laser‐induced plasma filaments are investigated at varying repetition rates up to 100 kHz and for pulse energies up to 0.4 mJ. Nonlinear losses, fluorescence emission, and breakdown voltage decrease with the repetition rate, while peak intensity and third‐harmonic‐generation efficiency increase.
Tie-Jun Wang, Mehdi H. Ebrahim, Ivi Afxenti, Dionysis Adamou, Adetunmise C. Dada, Ruxin Li, Yuxin Leng, Jean-Claude Diels, Daniele Faccio, Arnaud Couairon, Carles Milián, Matteo Clerici   +11 more
wiley   +1 more source

Comparing Performances of Five Distinct Automatic Classifiers for Fin Whale Vocalizations in Beamformed Spectrograms of Coherent Hydrophone Array

Remote Sensing, 2020
A large variety of sound sources in the ocean, including biological, geophysical, and man-made, can be simultaneously monitored over instantaneous continental-shelf scale regions via the passive ocean acoustic waveguide remote sensing (POAWRS) technique ...
Heriberto A. Garcia, Trenton Couture, Amit Galor, Jessica M. Topple, Wei Huang, Devesh Tiwari, Purnima Ratilal   +6 more
doaj   +1 more source

Stratospheric Balloon Observations of Infrasound Waves From the 15 January 2022 Hunga Eruption, Tonga

Geophysical Research Letters, Volume 49, Issue 19, 16 October 2022., 2022
Abstract The 15 January 2022 eruption of the Hunga volcano (Tonga) generated a rich spectrum of waves, some of which achieved global propagation. Among numerous platforms monitoring the event, two stratospheric balloons flying over the tropical Pacific provided unique observations of infrasonic wave arrivals, detecting five complete revolutions ...
Aurélien Podglajen, Alexis Le Pichon, Raphaël F. Garcia, Solène Gérier, Christophe Millet, Kristopher Bedka, Konstantin Khlopenkov, Sergey Khaykin, Albert Hertzog   +8 more
wiley   +1 more source