Abstract: A diametric adjustment mechanism for an implantable medical device including a track defining a series of diametric setpoints, including a first diametric setpoint and a second diametric setpoint, a rider engaged with the track such that the rider is selectively movable along the track from the first diametric setpoint to the second diametric setpoint and from the second diametric setpoint to the first diametric setpoint, and a biasing element biasing the rider toward the first diametric setpoint when the rider is at the second diametric setpoint.

Abstract: The regulation, power-handling capability, and reliability of a transformer is improved by a connected switching network which changes the effective numbers of turns and effective wire size of the windings synchronously during each cycle of an applied AC input voltage.

Abstract: The regulation, power-handling capability, and reliability of a transformer is improved by a connected switching network which changes the effective numbers of turns and effective wire size of the windings synchronously during each cycle of an applied AC input voltage.

Abstract: Apparatus for containing oil and/or gas leakage from a drilling operation (off-shore or on-shore) comprised of an expandable membrane surrounding a central spline, an apparatus adapted to the removal of the captured oil or gas, and a blowout-handling “fuse” capability. The bottom section of the off-shore version includes operator-controlled extension members to expand the membrane to fully surround the drill site. Any further leakage from the well site will further expand the membrane from the spline sections as it moves upward. When the leaked material reaches the top an extraction apparatus included allows it to be extracted safely.

Abstract: A system and method are disclosed for providing a real-time map of ionospheric properties. An ionospheric model is provided that provides a baseline description of ionospheric properties. A primary data source is provided that is indicative of real time propagation data obtained for the ionosphere in the vicinity of a control point. The real time propagation data is indicative of the critical frequency for the ionospheric layer. The ionospheric model is modified based on the real time propagation data obtained for the ionosphere in the vicinity of the control point. This includes modifying the critical frequency for the ionospheric layer. In this manner, the ionospheric model is updated according to real time propagation data.