Abstract: A contactor apparatus is provided to treat ballast water that has exited a ballast tank before being expelled from a water-borne ship. Within the contactor apparatus, means are provided for supplying a combination of acoustic energy and dissolved ozone. The acoustic energy can be provided at two or more frequencies (e.g., at 16 and 20 kHz). The acoustic energy and dissolved ozone, together, offer a more-effective and more-efficient mode of disinfecting the ballast water before release.

Abstract: A centrifugal feed distributor or feeder (10) to distribute feed (16) in a substantially circular distribution array (58) for fish or livestock. Feeder (10) includes a domed housing (20), a fan assembly (32), and a rotating base (34). The domed housing (20) includes a substantially cylindrical sidewall (22), a closed upper end (24), and a large open lower end (26), which together define a inner chamber (28) and an exterior (30). The fan assembly (32) includes a plurality of fan blades (36) each connected to a vertical shaft (40) that rotates about a center of shaft when an external force (18) is applied to the fan blades. The shaft (40) is also connected to base (34), which rotates about shaft center at the same speed the fan blades rotate. The fan assembly (32) is positioned within domed housing chamber (28). An output gap (52) is defined by the position of the lower end (26) of the housing (20) in relationship to the rotating base (34).

Abstract: An airflow sensor is designed with features which enhance the accuracy of measurement. The central hub of the airflow sensor is made in an air foil shape to reduce noise and turbulence at that region. The airflow sensing tubes extend radially outwardly from the central hub and are made extremely thin in profile to minimize turbulence. Each airflow sensing tube has a plurality of spaced airflow receiving openings therethrough which are spaced from one another in a manner permitting each opening to receive air from a volume of air equal to the volumes of air from which other holes receive air flow. The downstream air collection tubes are circumferentially spaced between the first-mentioned airflow sensing tubes and have open ends to receive air from the open areas between the first-mentioned airflow sensing tubes.