history of underwater diving dates back to antiquity. breath-hold technique in diving was known to the ancient nations. however, deep diving progressed only in the early decades of the 19 th century as the result of advancements in efficient underwater technologies which subsequently led to invention of sophisticated sets of scuba diving in the 20 th century. currently, diving is performed for ...

This paper presents a novel surrogate-assisted evolutionary algorithm, CSMOEA, for multi-objective optimization problems (MOPs) with computationally expensive objectives. Considering most algorithms (SAEAs) do not make full use of population information and only in either the objective space or design independently, to address this limitation, we propose new strategy comprehensive utilization s...

Behavior of blast wave in underwater explosion is of interest to metal forming community and ship designers. Underwater detonation is, also a potential hazard to the water intakes or a plant spent fuel pool. In this paper, some techniques for calculating free-field blast parameters such as pressure and impulse in underwater explosion and prediction of bubble pulsation parameters are presented a...

Young, relatively undeveloped sugar gliders Petaurus breviceps have been observed to be left alone in the nest while the mother forages and may be subject to considerable thermal or energetic stress. As no information is available on the development of thermoregulation in this species, which begins reproduction in winter, we measured resting metabolic rate (RMR), body temperature (Tb) and therm...

Due to the lack of a powerful propulsion device in conventional autonomous underwater gliders (AUGs), their mobility and flexibility are insufficient, thus not being capable also ensuring stability motion route. Thus, it is necessary further develop hybrid-driven AUGs. This paper applied CFD simulation experimental analysis methods study design AUG with propeller optimized from type swept-forwa...

Observations of turbulent kinetic energy dissipation rate () from a range historical shelf seas data sets are viewed the perspective their forcing and mechanisms: barotropic to baroclinic tidal conversion, pycnocline bottom boundary layer (BBL) dissipation. The observations placed in geographical context using high resolution numerical model (NEMO AMM60) order compute relevant maps (conversion)...

Water eutrophication is a global environmental problem that poses serious threats to aquatic ecosystems and human health. The evaluation of provides theoretical basis technical guidance for the management rehabilitation water ecosystems. In last four decades, dozens methods have been applied freshwater eutrophication, but there clear need optimize standardize most suitable methods. We addressed...

Recent advances in Autonomous Underwater Vehicle (AUV) technology have facilitated the collection of oceanographic data at a fraction of the cost of ship-based sampling methods. Unlike oceanographic data collection in the deep ocean, operation of AUVs in coastal regions exposes them to risk of collision with ships and land. Such concerns are particularly prominent for slow-moving AUVs since oce...

Abstract Ocean monitoring is an expensive and time consuming endeavor, but it can be made more efficient through the use of teams autonomous robots. In this paper, we present a system for identification tracking ocean fronts by coordinating sampling efforts heterogeneous team surface vehicles (ASVs) underwater (AUVs). The primary contributions study are (1) our algorithm performing coordination...