For direct drive (pistonless) projectors made of [011]-poled PZN-5.5%PT single crystal of ≤62 mm3 in volume, the source levels of underwater sound generated via respective TROB and CTW modes are comparable and can be >180 dB re 1 μPa @ 1 m, which can be combined to advantage to form a broad bandwidth underwater projector.
Through this study, the dominant noise source of the underwater propeller is analyzed, which will provide a basis for proper noise control strategies.
Ducharme, for example, discusses mermaids as a source of empowerment, and underwater as a place he feels comfortable.
Graham and I discussed all this, and it was obvious that the main source of funding for underwater technology is industry.
In our case, the source of degradation in underwater imaging includes turbidity, floating particles and the optical properties of light propagation in water.
In our laboratory study, we examined how exposure to playback of noise originally recorded from ships, a prevalent source of human-generated underwater noise, affects the feeding behaviour of two sympatric fish species: the three-spined stickleback, Gasterosteus aculeatus, and the European minnow, Phoxinus phoxinus.
M. Lopatka et al. address the task of underwater broadband source localization based on modal filtering and features extraction.
Two data-driven models are presented to predict and analyze the performance of a PEM fuel cell operating on pure oxygen that can be used as an effective power source for air-independent operation of underwater vehicles, spacecrafts, unmanned aerial vehicles, etc.
The biggest source of concern remains the growing numbers of underwater borrowers — now about one-third of all American homeowners with mortgages, according to Economy.com.com
The latest source of friction is an artificial underwater reef, made of concrete blocks with metal spikes, which the Gibraltarian government is building to stop overfishing by local Spaniards in what it sees as its waters.Spain claims those waters (much as it claims sovereignty over Gibraltar itself) and says the local government is acting illegally.
