Results 61 to 70 of about 14,469 (220)

Precision and accuracy of fish length measurements obtained with two visual underwater methods [PDF]

, 2006
During the VITAL cruise in the Bay of Biscay in summer 2002, two devices for measuring the length of swimming fish were tested: 1) a mechanical crown that emitted a pair of parallel laser beams and that was mounted on the main camera and 2) an underwater
Cadiou, Jean-François, Rochet, Marie-Joëlle, Trenkel, Verena M.   +2 more
core   +1 more source

Global Analysis of Shallow Underwater Fish Observation Research: 70 Years of Progress, Persistent Geographic Biases and a Path Forward

Fish and Fisheries, EarlyView.
ABSTRACT Marine ecosystems are increasingly threatened by overfishing, pollution, coastal development and climate change, underscoring the need for long‐term, representative information on key fish populations and habitats to inform management and policy.
Angus John van Wyk, Rick D. Stuart‐Smith, Jordan S. Goetze, Eva Maire, Elodie Heyns‐Veale, Kaylee Smit, Tim J. Langlois, M. Aaron MacNeil, Alejandro Pérez‐Matus, Amanda T. Lombard, Ana Carolina, Christy Semmens, Ella Clausius, Fernanda A. Rolim, Jonathan S. Lefcheck, Jacquomo Monk, Joanna K. Schmid, Katherine Tattersall, Laura Ghigliotti, Luther Adams, Melita Samoilys, Pascale Chabanet, Paul Whomersley, Peter Walsh, Reiji Masuda, Russell Brainard, Anthony Bernard   +26 more
wiley   +1 more source

RAO-II: an AUV for underwater inspection [PDF]

, 2008
AIRSUB is a research project funded by the Spanish Ministry of Science and Technology whose aim is to explore the industrial applications of underwater robots.
Bonin, F., Oliver, G., Ortiz, A.
core   +1 more source

Reproductive behaviour of the ocean triggerfish Canthidermis sufflamen (Tetraodontiformes: Balistidae) in the shallow waters of the marine‐protected area of El Hierro Island (Canary Islands)

Journal of Fish Biology, EarlyView.
Abstract The abundance of Canthidermis sufflamen has increased worldwide, including around the Canary Islands, due to global ocean warming. The reproductive behaviour of this species was studied within a marine‐protected area (MPA) and its adjacent areas off the island of El Hierro (Canary Islands).
Alberto Rodríguez‐Díaz, Raül Triay‐Portella, José A. González, José G. Pajuelo   +3 more
wiley   +1 more source

AUV/ASC cooperative survey [PDF]

, 2016
In this paper we describe a solution to perform autonomous surveys taking advantage of a cooperative multivehicle setup. In the proposed configuration, an ASC provides –through an USBL- absolute positioning and communications to an AUV.
Carreras, Marc, Hurtós, Natalia, Palomeras, Narcís   +2 more
core  

Experimental Verification of a Depth Controller using Model Predictive Control with Constraints onboard a Thruster Actuated AUV [PDF]

, 2012
In this work a depth and pitch controller for an autonomous underwater vehicle (AUV) is developed. This controller uses the model predictive control method to manoeuvre the vehicle whilst operating within the defined constraints of the AUV actuators ...
Furlong, M., Phillips, A.B., Rogers, E., Steenson, Leo V., Turnock, S.R.   +4 more
core   +1 more source

The role of e-government services on intention to use with mediator effect of citizens’ satisfaction in the UAE [PDF]

, 2022
Intention to use E-Government services by citizens of United Arab Emirates (UAE) considered as vital element in the use of E-Government services. Previous studies were not focused on citizens’ intention to use E-Governmnet services hence, has highlighted
Sabah Obaid, Qamar Mohamed
core  

Towards a Digital Twin for Open-Frame Underwater Vehicles Using Evolutionary Algorithms

Applied Sciences
Hydrodynamic coefficients determine the behavior of all simulated underwater vehicles. Therefore, it is essential to precisely define their values when aiming to replicate a real vehicle.
Félix Orjales, Julián Rodríguez-Cortegoso, Enrique Fernández-Pérez, Alejandro Romero, Vicente Diaz-Casas   +4 more
doaj   +1 more source

Modular AUV System with Integrated Real-Time Water Quality Analysis

Sensors, 2018
This paper describes the concept, the technical implementation and the practical application of a miniaturized sensor system integrated into an autonomous underwater vehicle (AUV) for real-time acquisition of water quality parameters.
Mike Eichhorn, Christoph Ament, Marco Jacobi, Torsten Pfuetzenreuter, Divas Karimanzira, Kornelia Bley, Michael Boer, Henning Wehde   +7 more
doaj   +1 more source

Hull Design for ROV with Four Thrusters (X4-ROV) [PDF]

, 2016
In this research, an X4-ROV consisting of four thrusters is design to develop a small ROV which does not have any rudders for an observation class unmanned underwater vehicle system. Each thruster is arranged at equal intervals to the same plane, and the
Khairil Ashraff, Ab Rahim, Maziyah, Mat Noh, Nurfadzillah, Harun, Zainah, Md. Zain   +3 more
core