摘要:
Distributed control of vehicles with coordinating cars that implement a cooperative control method, and non-coordinating cars that are presumed to follow predictable dynamics. A cooperative control method can combine distributed receding horizon control, for optimization-based path planning and feedback, with higher level logic, to ensure that implemented plans are collision free. The cooperative method can be completely distributed with partially synchronous execution, and can afford dedicated time for communication and computation, features that are prerequisites for implementation on real freeways. The method can test for conflicts and can calculate optimized trajectories by adjusting parameters in terminal state constraints of an optimal control problem.
摘要:
A spin-through rod centralizer consisting of a stator constructed of plastic, or other appropriate material, which is mounted on the rod coupling which provides the bearing surface for rotation of the coupling within the stator. The stator, which is free to rotate on the rod coupling and, hence, would move freely axially along the coupling, is restrained from such axial movement by two steel “washers” that are captured between the rod shoulders and the coupling when the connection between two rods is made up. The washers are slightly larger in diameter than the coupling and thereby keep the stator located on the coupling, yet do not restrict the relative rotation between the coupling and the stator. This coupling mounted centralizer will not interfere with rod string make-up when using equipment in common use. An alternative configuration uses a coupling with a shoulder at one end that acts as one of the “washers” to restrain the stator from axial movement.
摘要:
A system for disengaging a power supply at the surface of a well from a downhole assembly having a pump for pumping fluid in the well to the surface thereof. A captured spline assembly interposed in the rod string, selectively connected to the downhole assembly to provide torsional drive.
摘要:
Avatar cloning in a virtual world may include receiving an input indicating that a user desires to access a cloning feature and allowing a cloned avatar to be cloned from the user's avatar.
摘要:
An ink jet printhead cartridge includes a cartridge body including a base and a plurality of side walls extending upwardly from the base. A filter tower having a tower wall has an interior surface that defines a location of a tower passageway. A printhead chip assembly is attached to the base of the cartridge body in fluid communication with the tower passageway. A filter is attached to the filter tower at a distal end thereof. An ink fill access port is formed through a side wall of the plurality of sidewalls, and through the tower wall of the filter tower, to define a fluid path from the atmosphere external to the cartridge body to the tower passageway of the filter tower to facilitate the injection of ink directly into the filter tower during an ink filling operation for the ink jet printhead cartridge.
摘要:
A mounting structure (34) for receiving a sensor (18) having a sensing portion (26) and a base portion (30) includes a substantially flat sheet of material (20) having a first surface (20a), a second surface (20b) opposite the first surface (20a), and an aperture (36). The aperture (36) is configured such that the sensing portion (26) of the sensor (18) is passable through the aperture (36), and the base portion (30) is not passable through the aperture (36), but instead rests on the first surface (20a). The mounting structure (34) also includes a pair of tabs (38) that extend in a downward direction away from the second surface (20b) of the sheet of material (20) and are configured to immobilize the sensor (18) within the aperture (36).
摘要:
Various devices are provided for allowing multiple surgical instruments to be inserted through a single surgical access device at variable angles of insertion, allowing for ease of manipulation within a patient's body while maintaining insufflation. Safety shields and release mechanisms are also provided for use with various surgical access devices.
摘要:
An improved delivery system for pumping fluid from a pay zone to the surface of a well consisting of a pump situated near the pay zone of the well, a drive head at the surface of the well and a rod string connecting the two, wherein a transmission is interposed between the pump and drive head on the rod string and fluid pumped from the pay zone passes through conduits, extending longitudinally in isolation through the transmission.