Abstract: A cryogenic cooler includes a housing, and first, second, and third actuators. The first actuator includes at least one first voice coil and at least one first magnetic circuit, the at least one first voice coil of the first actuator configured to drive a compressor piston, the first actuator causing vibrations to the housing when driving the compressor piston. The second actuator includes at least one second voice coil and at least one second magnetic circuit, the at least one second voice coil of the second actuator configured to reduce the vibrations to the housing caused by driving the compressor piston. The third actuator includes at least one third voice coil and at least one third magnetic circuit, the third actuator configured to drive a displacer piston. The compressor piston, balance mechanism, and displacer piston are concentrically formed within the cryogenic cooler.

Abstract: A cryogenic cooler includes a housing, and first, second, and third actuators. The first actuator includes at least one first voice coil and at least one first magnetic circuit, the at least one first voice coil of the first actuator configured to drive a compressor piston, the first actuator causing vibrations to the housing when driving the compressor piston. The second actuator includes at least one second voice coil and at least one second magnetic circuit, the at least one second voice coil of the second actuator configured to reduce the vibrations to the housing caused by driving the compressor piston. The third actuator includes at least one third voice coil and at least one third magnetic circuit, the third actuator configured to drive a displacer piston. The compressor piston, balance mechanism, and displacer piston are concentrically formed within the cryogenic cooler.

Abstract: An apparatus, system, and method are disclosed for managing objects in a database according to a dynamic predicate representation of an explicit relationship between objects. The apparatus includes a correlation module, a storage module, a query module, and a deletion module. The correlation module associates a set of predicate identifiers with a set of predicates. Each predicate is a description of a relationship between objects, or properties of objects. The predicate includes a predetermined number of arguments. The storage module stores a set of tuples in a database. Each tuple includes one of the predicate identifiers and the predetermined number of arguments as required by the predicate associated with the predicate identifier. The query module retrieves a subset of the tuples satisfying a query expression from the database. The deletion module deletes at least one of the tuples from the database.