Abstract: A mechanical seal assembly having a gland element configured to mount to stationary equipment, a rotary seal ring for coupling to and rotating with a shaft, a stationary seal ring configured to remain stationary relative to the shaft where the stationary seal ring has a main body having an outer surface having a heat transfer channel formed therein that is sized and configured for circulating a heat transfer fluid, and a holder element for coupling the rotary seal ring to the shaft and for rotating with the shaft. The heat transfer channel can be a low pressure heat transfer channel.

Abstract: A portable personal alarm which has a small size and achieves high sound levels utilizes the overdriving of a miniature buzzer. In order to reduce the likelihood of damage to the buzzer and create a more terrifying and noticeable sound, the alarm tone is pulsed.

Abstract: A ground-effect vehicle having a base frame and a downwardly extending skirt, rides on an air cushion created by injecting air downwardly through the frame into the space beneath the vehicle. In order to prevent the down draft of the air injected under the vehicle from damaging fragile objects, such as young plants, a deflector is provided to divert the air flow parallel to the ground and to reduce its velocity, while still maintaining sufficient pressure in the air cushion to permit the vehicle to hover.