Abstract: A mobile aquarium includes a display tank mounted on a wheeled cart and a system for lowering the center of gravity of the aquarium. In one embodiment, the system for lowering the center of gravity uses a storage tank that is lower than the display tank. The system transfers water from the display tank to the storage tank for moving. The lower water level in the display tank is kept high enough to provide a livable habitat for fish in the display tank. A background lighting system for the aquarium includes a light source and a semi-opaque sheet with a first image on a first side and a second image on a second side. The light source illuminates the sheet so that the second image shows through the first side of the sheet and appears behind the first image. In one embodiment, the first image has a graduate color that is lighter at one end than the other.

Abstract: A mobile aquarium includes a display tank mounted on a wheeled cart and a system for lowering the center of gravity of the aquarium. In one embodiment, the system for lowering the center of gravity uses a storage tank that is lower than the display tank. The system transfers water from the display tank to the storage tank for moving. The lower water level in the display tank is kept high enough to provide a livable habitat for fish in the display tank. A background lighting system for the aquarium includes a light source and a semi-opaque sheet with a first image on a first side and a second image on a second side. The light source illuminates the sheet so that the second image shows through the first side of the sheet and appears behind the first image. In one embodiment, the first image has a graduate color that is lighter at one end than the other.

Abstract: An optical scanning device for raster scanning applications based on galvanometric scanner technology incorporates a nonlinear biasing element, such as a nonlinear magnetic or mechanical spring to assist in the acceleration and deceleration of the motor shaft at the turn around points of the sawtooth motion. The galvanometric scanning device includes a moving magnet motor using more than four poles, e.g., eight poles. The moving magnet motor has a plurality of laminations each having a number of teeth, e.g., eight, extending inward toward the rotor and having coils mounted thereon. In one embodiment, coils are mounted on every other tooth. The motor is driven with a fourth order polynomial sawtooth command signal to reduce resonances caused by high acceleration and deceleration. In addition, the motor may be driven by pulse width modulation to reduce power dissipation.

Abstract: An implantable drug delivery pump includes a reservoir, a dispensing chamber adjacent to the reservoir, a dispensing passage provided along an interior surface of the dispensing chamber, and an actuator for applying a moving compressive force onto the dispensing passage. The pump is subcutaneously implantable in a patient, and a drug is injected into the reservoir through a septum provided on a housing for the reservoir. As the compressive force applied by the actuator moves along the dispensing passage, the drug preparation is simultaneously pushed out of the dispensing passage into a catheter for delivery to the desired site, and additional drug preparation is drawn into the dispensing passage from the reservoir. The actuator includes a rotating arm driven by an motor at a controllable rate.