Abstract: An acoustic suppression system for absorbing and/or scattering acoustic energy comprising a plurality of acoustic targets in a containment is described, the acoustic targets configured to have resonance frequencies allowing the targets to be excited by incoming acoustic waves, the resonance frequencies being adjustable to suppress acoustic energy in a set frequency range. Methods for fabricating and implementing the acoustic suppression system are also provided.

Abstract: An acoustic suppression system for absorbing and/or scattering acoustic energy comprising a plurality of acoustic targets in a containment is described, the acoustic targets configured to have resonance frequencies allowing the targets to be excited by incoming acoustic waves, the resonance frequencies being adjustable to suppress acoustic energy in a set frequency range. Methods for fabricating and implementing the acoustic suppression system are also provided.

Abstract: A process for generating microbubbles in a body of liquid includes immersing a tubular member defining a chamber having closed and open ends in a body of liquid with the closed end facing upward and the open end downward in the body of liquid; pressurizing the interior of chamber adjacent its closed end with a gas to maintain a level of liquid within the tubular member at a desired operating level; providing a liquid flow conduit conveying a liquid stream and having a terminal end within the chamber located such that the terminal end is fixed at a level just below the operating level of the liquid to thereby cause a stream of liquid flowing through the conduit to cause periodic oscillation of the level of liquid adjacent the conduit terminal end between positions just above and just below the terminal end, thereby causing periodic entrainment of gas from above the operating level of the liquid into the stream flowing through the conduit in the form of extremely small bubbles on the order to 30 .mu.