A microfluidic device that comprises several microchannel structures in which there are an inlet port, an outlet port and there between a structural unit comprising a fluidic function. The storage medium stores: AV data; and metadata for conducting an enhanced search of the AV data by scene using information regarding at least one search keyword. A covariance matrix of the received signal is estimated. The printhead controller is configured to modify operation of at least some of the nozzles in response to the temperature rising above a first threshold. The system described herein reduces this transient torque production in the motor. Some power source connectors are formed at one end of the backplane and the other power source connectors are formed at the other end of the backplane.