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Underwater volcano observation by autonomous underwater vehicle "r2D4"
Europe Oceans 2005, 2005Based on the successes in development and field operations of AUV "R-One Robot", the Underwater Technology Research Center at the University of Tokyo established a five year project for a next generation long-range cruising type AUV from 2001, an AUV named "r2D4".
K. Nasahashi +6 more
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Marine Observation Network based on Underwater Vehicles
Proceedings of the International Conference on Underwater Networks %Systems - WUWNET '14, 2014Recently, ocean observation is developing from using a single underwater sensor node to employing underwater sensor networks consisting of multiple sensor platforms. Underwater vehicles including underwater gilders and autonomous underwater vehicles (AUVs) are important underwater mobile sensor platforms in ocean observation networks.
Shuo Li +3 more
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Micro ROV underwater observations
Oceans '99. MTS/IEEE. Riding the Crest into the 21st Century. Conference and Exhibition. Conference Proceedings (IEEE Cat. No.99CH37008), 2003In 1999 P.P. Shirshov Institute of Oceanology RAS together with Industrial electronics (Indel) company, Moscow, designed and tested a small sized microROV "GNOM" intended for underwater investigations and observations. It contains video camera, thrusters, lights and sensors.
B.J. Rozman, L.L. Utyakov
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Radionuclide observables of underwater nuclear explosive tests
Journal of Environmental Radioactivity, 2018There remain technical challenges for an On-site Inspection (OSI) in the high seas environment, which gathers evidence of a violation of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). For terrestrial nuclear explosions, the radionuclide observables are well defined and States Parties have chosen 17 particulate radionuclides that allow discrimination
Jonathan L, Burnett, Brian D, Milbrath
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Robust observer design for underwater vehicles
2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006 IEEE International Symposium on Intelligent Control, 2006In this paper we propose a new observer system for underwater vehicles. The main design objective behind this strategy is to reduce the effect of the destabilizing Coriolis and centripetal forces and moments. For low cost vehicles with limited measurement equipment, these forces and moments represent a significant challenge for automatic control when ...
Jon Refsnes +2 more
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Observations of natural fluorescence with an underwater radiometer
Journal of the Oceanographical Society of Japan, 1987Measurements of subsurface irradiance spectra in the ocean consistently indicate intensities of long-wavelength visible light (λ≧589 nm) greater than could be derived from the penetration of sunlight. This can be attributed to natural fluorescence and/or to spectral crosstalk due to light leakage through the blocking filters of each discrete detector ...
James C. Kitchen, Hasong Pak
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Underwater observations of piranhas in western Brazil
Environmental Biology of Fishes, 1990The behaviour of three piranha species,Serrasalmus marginatus, S. spilopleura, andPygocentrus nattereri, and their prey fishes was studied underwater in the Pantanal region, Mato Grosso, Brazil. General habits, predatory tactics, feeding behaviour, and social interactions while foraging, as well as defensive tactics of prey fishes were observed.S ...
Ivan Sazima, Francisco A. Machado
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Low-cost remotely operated underwater vehicle for underwater observation purposes
2017 IEEE 7th International Conference on Underwater System Technology: Theory and Applications (USYS), 2017This paper is about the development of a low-cost remotely operated underwater vehicle (ROV) for the observation of underwater environments without risking human life. The overall safety feature focuses on protecting internal circuits from being overloaded by any unexpected high current as well as protecting battery from being over-discharged to ...
Wan Muhd Arif Bin Wan Sabri +7 more
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2013 IEEE International Underwater Technology Symposium (UT), 2013
We developed an underwater gravimeter for exploration of a seafloor hydrothermal deposit. Our hybrid gravimeter system consists of an underwater gravimeter and an underwater gravity gradiometer. We adopted Micro-g LaCoste S-174 as a gravity sensor. The sensor is mounted on a gimbal mechanism with a fiber gyroscope. A titanium sphere contains the sensor
M. Shinohara +8 more
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We developed an underwater gravimeter for exploration of a seafloor hydrothermal deposit. Our hybrid gravimeter system consists of an underwater gravimeter and an underwater gravity gradiometer. We adopted Micro-g LaCoste S-174 as a gravity sensor. The sensor is mounted on a gimbal mechanism with a fiber gyroscope. A titanium sphere contains the sensor
M. Shinohara +8 more
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Analysis of the current waveforms observed in underwater spark discharges
2007 16th IEEE International Pulsed Power Conference, 2007Summary form only given. There is a growing interest in the industrial applications of high power ultrasound (HPU) generated using a spark discharge in a liquid medium driven by a pulsed power supply. These applications include: metal processing, in particular peening techniques to increase hardness and resistance to cracks, comminution of waste ...
M.J. Given +4 more
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