The Experts below are selected from a list of 50952 Experts worldwide ranked by ideXlab platform
Adrian C Gleiss - One of the best experts on this subject based on the ideXlab platform.
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contrasting diel patterns in Vertical Movement and locomotor activity of whale sharks at ningaloo reef
Marine Biology, 2013Co-Authors: Adrian C Gleiss, Serena Wright, Nikolai Liebsch, Rory P Wilson, Brad NormanAbstract:Activity patterns of animals often relate to environmental variables such as food availability and predation pressure. Technological advances are providing us with new tools to monitor and better understand these activity patterns. We used animal-attached data loggers recording acceleration and depth to compare activity patterns and Vertical habitat use of whale sharks (Rhincodon typus) at Ningaloo Reef, Western Australia. Whale sharks showed a moderate reverse diel Vertical migration but exhibited a clear crepuscular pattern in locomotory activity. Peak activity occurred at sunset, whereas Vertical Movement peaked prior to this. Typical ram surface filter feeding could be identified and occurred primarily during sunset and the first hours of night. At such times, direct observations indicated whale sharks were feeding on tropical krill swarms. Kinematic analysis of postural data and data from Vertical Movement suggests that whale sharks at Ningaloo spend ~8 min per day actively ram surface filter feeding. Considering the high biomass present in krill schools, it is estimated that whale sharks at Ningaloo have a similar energy intake as those at other aggregation sites. Diel patterns in activity and diving behaviour suggest that whale sharks have tuned their diving behaviour in anticipation of the formation of these high-density patches which appear to only be periodically, but predictably available at sunset. Our results confirm that diel patterns in Vertical habitat selection and Vertical Movements do not necessarily reflect patterns in activity and foraging behaviour. Direct quantification of activity and behaviour is required in gaining accurate representation of diel activity patterns.
Stanisław Gardecki - One of the best experts on this subject based on the ideXlab platform.
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AUTOMATION - Development of Vertical Movement Controller for Multirotor UAVs
Automation 2017, 2017Co-Authors: Przemyslaw Gasior, Adam Bondyra, Stanisław GardeckiAbstract:In this paper, a Vertical velocity controller for multirotor UAVs is proposed. Based on the previous research, authors developed a model of Vertical Movement which takes into consideration measurement noises, and designed a simulation that allowed tuning of mentioned controller. As a regulation scheme, a classical PI structure was used. The derivative part was neglected because of high amplitude of noise during harsh touchdowns. Tuning of parameters was achieved by PSO optimisation. Experimental results showed that the selected control structure and its parameters fulfill stated requirements. In addition, developed simulation is adequate to the real platform.
Brad Norman - One of the best experts on this subject based on the ideXlab platform.
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contrasting diel patterns in Vertical Movement and locomotor activity of whale sharks at ningaloo reef
Marine Biology, 2013Co-Authors: Adrian C Gleiss, Serena Wright, Nikolai Liebsch, Rory P Wilson, Brad NormanAbstract:Activity patterns of animals often relate to environmental variables such as food availability and predation pressure. Technological advances are providing us with new tools to monitor and better understand these activity patterns. We used animal-attached data loggers recording acceleration and depth to compare activity patterns and Vertical habitat use of whale sharks (Rhincodon typus) at Ningaloo Reef, Western Australia. Whale sharks showed a moderate reverse diel Vertical migration but exhibited a clear crepuscular pattern in locomotory activity. Peak activity occurred at sunset, whereas Vertical Movement peaked prior to this. Typical ram surface filter feeding could be identified and occurred primarily during sunset and the first hours of night. At such times, direct observations indicated whale sharks were feeding on tropical krill swarms. Kinematic analysis of postural data and data from Vertical Movement suggests that whale sharks at Ningaloo spend ~8 min per day actively ram surface filter feeding. Considering the high biomass present in krill schools, it is estimated that whale sharks at Ningaloo have a similar energy intake as those at other aggregation sites. Diel patterns in activity and diving behaviour suggest that whale sharks have tuned their diving behaviour in anticipation of the formation of these high-density patches which appear to only be periodically, but predictably available at sunset. Our results confirm that diel patterns in Vertical habitat selection and Vertical Movements do not necessarily reflect patterns in activity and foraging behaviour. Direct quantification of activity and behaviour is required in gaining accurate representation of diel activity patterns.
Serena Wright - One of the best experts on this subject based on the ideXlab platform.
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contrasting diel patterns in Vertical Movement and locomotor activity of whale sharks at ningaloo reef
Marine Biology, 2013Co-Authors: Adrian C Gleiss, Serena Wright, Nikolai Liebsch, Rory P Wilson, Brad NormanAbstract:Activity patterns of animals often relate to environmental variables such as food availability and predation pressure. Technological advances are providing us with new tools to monitor and better understand these activity patterns. We used animal-attached data loggers recording acceleration and depth to compare activity patterns and Vertical habitat use of whale sharks (Rhincodon typus) at Ningaloo Reef, Western Australia. Whale sharks showed a moderate reverse diel Vertical migration but exhibited a clear crepuscular pattern in locomotory activity. Peak activity occurred at sunset, whereas Vertical Movement peaked prior to this. Typical ram surface filter feeding could be identified and occurred primarily during sunset and the first hours of night. At such times, direct observations indicated whale sharks were feeding on tropical krill swarms. Kinematic analysis of postural data and data from Vertical Movement suggests that whale sharks at Ningaloo spend ~8 min per day actively ram surface filter feeding. Considering the high biomass present in krill schools, it is estimated that whale sharks at Ningaloo have a similar energy intake as those at other aggregation sites. Diel patterns in activity and diving behaviour suggest that whale sharks have tuned their diving behaviour in anticipation of the formation of these high-density patches which appear to only be periodically, but predictably available at sunset. Our results confirm that diel patterns in Vertical habitat selection and Vertical Movements do not necessarily reflect patterns in activity and foraging behaviour. Direct quantification of activity and behaviour is required in gaining accurate representation of diel activity patterns.
Jorge Aranda - One of the best experts on this subject based on the ideXlab platform.
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Interactive computer-aided control design using quantitative feedback theory: The problem of Vertical Movement stabilization on a high-speed ferry
International Journal of Control, 2005Co-Authors: J.m. Díaz, Sebastian Dormido, Jorge ArandaAbstract:In a first approximation, the Vertical acceleration associated with pitch motion can be considered as the main cause of motion sickness, which is without a doubt one of the most unpleasant disadvantages of maritime transport. The reduction of motion sickness can be stated as a monovariable regulation problem of a highly perturbed system. This work presents the design of a monovariable robust controller with quantitative feedback theory (QFT) for reducing the Vertical Movement on a high-speed ferry. The different stages of QFT methodology have been done with the help of the software tool QFTIT (Quantitative Feedback Theory Interactive Tool). This is a free software tool that is characterized by its ease of use and interactive nature. The designed regulator is validated experimentally in sea behaviour trials with a scaled down replica 1/25 the size of a high-speed ferry. The designed regulator is also compared with a gain-scheduling scheme using a proportional and derivative controller (PD).
