Abstract: A compressor apparatus for the turbocharger of a piston engine is provided. The compressor apparatus includes a compressor for compressing a flowing medium to produce a compressed medium and a return device by which at least a partial stream of the compressed medium is fed anew to the compressor.

Abstract: A computer-implemented system, method, and computer-readable medium for creating and trading securitized environmental offset credits in a registered securities exchange includes providing a processor, memory device, at least one user interface, and a network connection arranged in an online trading platform; registering, in a database in the memory device and via the network connection, one or more environmental offset credits to respective owners thereof; requesting, via the network, equitization of at least a portion of the one or more environmental offset credits by a securities regulator; applying a unique identifier supplied by the securities regulator to the equitized one or more environmental offset credits; and assigning custody of each of the equitized one or more environmental offset credits to a custodian and storing the custodian assignment in the database.