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Relevant bibliographies by topics / Passive underwater tomography

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Academic literature on the topic 'Passive underwater tomography'

Author: Grafiati

Published: 4 May 2024

Last updated: 31 July 2025

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Journal articles on the topic "Passive underwater tomography"

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Jonsson, P., I. Sillitoe, B. Dushaw, J. Nystuen, and J. Heltne. "Observing using sound and light – a short review of underwater acoustic and video-based methods." Ocean Science Discussions 6, no. 1 (2009): 819–70. http://dx.doi.org/10.5194/osd-6-819-2009.

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Abstract. This paper is a review which briefly describes a selection of acoustic observation techniques and certain aspects of underwater video technology suitable for observations in an underwater environment. The review is divided into two sections, one for each subject, where each section concludes with a discussion of the current challenges within the respective fields. The acoustic section of the review covers bathymetric and geometrical measurements, imaging sonars, subsurface penetrating profilers, positioning methods, acoustic underwater communication and sensor networks, and water spe

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Miksis-Olds, Jennifer L., Eric Rehm, Bruce M. Howe, Peter F. Worcester, Georgios Haralabus, and Hanne Sagen. "Envisioning a Global Multi-Purpose Ocean Acoustic Network." Marine Technology Society Journal 55, no. 3 (2021): 78–79. http://dx.doi.org/10.4031/mtsj.55.3.27.

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Abstract Due to the efficient propagation of sound in water, sound in the deep ocean propagates such great distances that soundscapes are influenced not only by local conditions but also by distant sound sources. Ocean Sound is now an Essential Ocean Variable within the Global Ocean Observing System making passive acoustic monitoring routine. Active acoustic probing of the environment informs us about ocean topography, currents and temperature, and abundance and type of marine life vital to fisheries and biodiversity related interests.Efficient sound propagation is the foundation of a proposed

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Tselentis, G.-Akis, Anna Serpetsidaki, Nikolaos Martakis, Efthimios Sokos, Paraskevas Paraskevopoulos, and Sotirios Kapotas. "Local high-resolution passive seismic tomography and Kohonen neural networks — Application at the Rio-Antirio Strait, central Greece." GEOPHYSICS 72, no. 4 (2007): B93—B106. http://dx.doi.org/10.1190/1.2729473.

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A high-resolution passive seismic investigation was performed in a [Formula: see text] area around the Rio-Antirio Strait in central Greece using natural microearthquakes recorded during three months by a dense, temporary seismic network consisting of 70 three-component surface stations. This work was part of the investigation for a planned underwater rail tunnel, and it gives us the opportunity to investigate the potential of this methodology. First, 150 well-located earthquake events were selected to compute a minimum (1D) velocity model for the region. Next, the 1D model served as the initi

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Ronczka, Mathias, Kristofer Hellman, Thomas Günther, Roger Wisén, and Torleif Dahlin. "Electric resistivity and seismic refraction tomography: a challenging joint underwater survey at Äspö Hard Rock Laboratory." Solid Earth 8, no. 3 (2017): 671–82. http://dx.doi.org/10.5194/se-8-671-2017.

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Abstract. Tunnelling below water passages is a challenging task in terms of planning, pre-investigation and construction. Fracture zones in the underlying bedrock lead to low rock quality and thus reduced stability. For natural reasons, they tend to be more frequent at water passages. Ground investigations that provide information on the subsurface are necessary prior to the construction phase, but these can be logistically difficult. Geophysics can help close the gaps between local point information by producing subsurface images. An approach that combines seismic refraction tomography and el

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Muinde, Jacob, Tian-Hao Zhang, Zu-Long Liang, et al. "Functional Anatomy of Split Compound Eyes of the Whirligig Beetles Dineutus mellyi (Coleoptera: Gyrinidae)." Insects 15, no. 2 (2024): 122. http://dx.doi.org/10.3390/insects15020122.

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The functional anatomy of the split compound eyes of whirligig beetles Dineutus mellyi (Coleoptera: Gyrinidae) was examined by advanced microscopy and microcomputed tomography. We report the first 3D visualization and analysis of the split compound eyes. On average, the dorsal and ventral eyes contain 1913 ± 44.5 facets and 3099 ± 86.2 facets, respectively. The larger area of ventral eyes ensures a higher field of vision underwater. The ommatidium of the split compound eyes is made up of laminated cornea lenses that offer protection against mechanical injuries, bullet-shaped crystalline cones

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Campos, Lisandro, Marta S. Fernández, and Yanina Herrera. "A new ichthyosaur from the Late Jurassic of north-west Patagonia (Argentina) and its significance for the evolution of the narial complex of the ophthalmosaurids." Zoological Journal of the Linnean Society, October 22, 2019. http://dx.doi.org/10.1093/zoolinnean/zlz095.

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Abstract Ophthalmosaurids were highly derived and the youngest clade of ichthyosaurs. Their evolutionary history comprises ~76 Myr (from the early Middle Jurassic to the final extinction of the group at the Cenomanian–Turonian boundary). Fossil records indicate that soon after they emerged they achieved a widespread geographical distribution. Analyses of disparity based on craniodental morphologies, and the co-occurrence of different bone histology and microstructure among the members of the group, indicate that ophthalmosaurids are not only taxonomically but also ecologically diverse. A regio

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Dissertations / Theses on the topic "Passive underwater tomography"

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Leroy, Charlotte. "Using ocean ambient noise cross-correlations for passive acoustic tomography." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39636.

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Recent theoretical and experimental studies have demonstrated that an estimate of the Green's function between two hydrophones can be extracted passively from the cross‐correlation of ambient noise recorded at these two points. Hence monitoring the temporal evolution of these estimated Green's functions can provide a means for noise‐based acoustic tomography using a distributed sensor network. However, obtaining unbiased Green's function estimate requires a sufficiently spatially and temporally diffuse ambient noise field. Broadband ambient noise ([200 Hz-20 kHz]) was recorded continuously for

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Josso, Nicolas. "Caractérisation des milieux sous-marins en utilisant des sources mobiles d'opportunité." Phd thesis, Grenoble INPG, 2010. https://theses.hal.science/tel-00546875.

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Les contraintes de rapidité et de discrétion imposées à un système moderne de caractérisation du milieu océanique ont conduit au développement de la tomographie passive, définie comme un moyen discret et rapide d'estimation des paramètres d'un canal acoustique. Ce concept fait appel aux signaux existants dans le milieu et transmis par des sources d'opportunité. Les signaux d'opportunité sont inconnus à la réception mais contiennent des informations relatives aux paramètres physiques du canal défini entre la source et le récepteur. Le travail de recherche présenté dans ce mémoire est d´edié à l

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