Abstract: A system can include one or more processors; memory; a data interface that receives data; a control interface that transmits control signals for control of pumps of a hydraulic fracturing operation; and one or more components that can include one or more of a modeling component that predicts pressure in a well fluidly coupled to at least one of the pumps, a pumping rate adjustment component that generates a pumping rate control signal for transmission via the control interface, a capacity component that estimates a real-time pumping capacity for each individual pump, and a control component that, for a target pumping rate for the pumps during the hydraulic fracturing operation, generates at least one of engine throttle and transmission gear settings for each of the individual pumps using an estimated real-time pumping capacity for each individual pump where the settings are transmissible via the control interface.

Abstract: A device for dispensing a strip of pre-printed tickets, said strip including a plurality of score lines defining successive tickets. The device includes a stepping motor which is used to convey the strip towards a theoretical cutting position using a determined number of motor steps corresponding to the number of tickets required. The aforementioned stepping motor is associated with adjustment means which are used, if necessary, to adjust the position from the strip from the theoretical cutting position to a correct cutting position. The adjustment means includes a first memory means which stores the individual length of the tickets by counting the corresponding number of steps of the motor, a second memory means which stores a characteristic motif of the tickets, and a recognition means which recognizes the passing of the motif as the strip is conveyed to the theoretical cutting position.