Abstract: In a method for distributed database replication, local change records describing the local changes to the database at a node are transmitted to other nodes. Each node receives from the other nodes other change records describing changes to the database at the other nodes, and a log of change records is accumulated. Each change record describes a change made to a row at a source node, e.g., using data such as an identifier of the source node, a source node abstract clock value, a row identifier, and cell values of the row before and after the change. Autonomously from the other nodes, each node applies the other change records to its local copy of the database, considering the other change records in source node abstract clock order.

Abstract: Method and apparatuses are disclosed for removing fine-grained particles from a gaseous sample stream from fluidized catalytic cracking regeneration unit. In one method, the fine-grained particles are wetted with condensate in a sampling system, then the wetted fine-grained particles are separated from the gaseous stream in a wetted packed column in the sampling system. The separated gaseous sample stream is cooled to remove condensible gases then is reheated. The separated fine-grained particles are kept wetted in the sampling system to prevent fouling of the sampling system, then stream is used as a motive force to return the wetted fine-grained particles to the fluidized catalytic cracking regeneration unit. The stream also is used as a drying agent to at least partially dry the wetted fine-grained particles outside of the sampling system and as a dilution agent to help prevent corrosion.