Abstract: A method whereby a concentrated aqueous solution of chlorine dioxide is injected into offshore water intake facilities for preventing zebra mussel infestation therein is described. The chlorine dioxide is generated from generators positioned on a portable vessel above the water intake facilities. The treatment using concentrated chlorine dioxide solution permits periodic treatment so that the same portable generators may be used to treat a number of water intake facilities.

Abstract: The present noise reduction system provides a tool and a method to dampen the vibration of sheet material such as a panel, a metal sheet or a skin while performing a manufacturing operation on it, for instance riveting, drilling, etc. This noise reducing tool is held in place by vacuum and thus avoids the disadvantages associated with gluing and mechanical or magnetic fixing devices. This noise reducing tool includes a flexible pad made of a metal back sheet with a vibration damping sheet adhered to it and having an air seal surrounding the damping sheet such that the pad is held against the panel by action of a vacuum intermediate the damping sheet and the panel.