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2. Fisheries acoustics - Wikipedia

   en.wikipedia.org/wiki/Fisheries_acoustics

   Biomass estimation is a method of detecting and quantifying fish and other marine organisms using sonar technology. [1] An acoustic transducer emits a brief, focused pulse of sound into the water. If the sound encounters objects that are of different density than the surrounding medium, such as fish, they reflect some sound back toward the source.

3. Broadband acoustic resonance dissolution spectroscopy

   en.wikipedia.org/wiki/Broadband_Acoustic...

   When the solvent is water and the gas is air, the value of α is 1.49 × 10 4. The effect of changes in solution density and solution compressibility are additive and reinforce the phenomenon, causing a significant decrease in the velocity of sound and, therefore, a significant decrease in the frequency of sound passing through an aerated solution.

4. Underwater acoustics - Wikipedia

   en.wikipedia.org/wiki/Underwater_acoustics

   Output of a computer model of underwater acoustic propagation in a simplified ocean environment. A seafloor map produced by multibeam sonar. Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries.

5. The 9 Best Sale Items at Costco Right Now - AOL

   www.aol.com/9-best-sale-items-costco-200246923.html

   $5.50 off each 24-pack of 16.9-ounce bottles. If you're tackling Dry January, San Pellegrino sparkling mineral water is a great way to mix things up.The 24-pack of 16.9-ounce bottles is $5.50 off ...

6. Ultrasonic transducer - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_transducer

   Distance is measured by multiplying half the time from the signal's outgoing pulse to its return by the speed of sound in the water, which is approximately 1.5 kilometres per second [T÷2×(4700 feet per second or 1.5 kil per second )] For precise applications of echosounding, such as hydrography, the speed of sound must also be measured ...

7. Sonar signal processing - Wikipedia

   en.wikipedia.org/wiki/Sonar_signal_processing

   Sonar systems are generally used underwater for range finding and detection. Active sonar emits an acoustic signal, or pulse of sound, into the water. The sound bounces off the target object and returns an echo to the sonar transducer. Unlike active sonar, passive sonar does not emit its own signal, which is an advantage for military vessels.