Large-scale event processing systems are often designed to perform data mining operations by storing a large set of events in a massive database, applying complex queries to the records of the events, and generating reports and notifications. The portable device may be used to receive a transmission from the wireless node, which may send the transmission periodically or upon receiving a beacon signal from the portable device. Additionally, the cam cover comprises a piece of sheet material that partially bounds the fluid passageway and creates a settling chamber for separating oil out of mixture with gaseous fluids being vented. After the fluid has been ejected out of the nozzle and onto a receiver, the fluid is irradiated and cured. Pivoting movement of the walking beams accommodates for varying ground contours in the longitudinal direction while independent upward and downward movement of the walking beam pivots relative to one another permits accommodation of varying ground contours in the lateral direction.