A method and system for enhancing engagement and accountability of students are provided. Sensor data may be received from a sensor indicating an angular change of orientation of the device. The fictitious marking element should then be unique for a predefined area of the substrate. In one embodiment, the system associated with the wellhead is a system for pumping fluid to the wellhead. The member is formed of an alloy which is a blend of a polyamide and a polyolefin, and a compatibilizing copolymer. The method includes the following steps: a target base station) receives multiple keys derived by a source base station, where the keys correspond to cells of the target base station; the target base station selects a key corresponding to the target cell after knowing a target cell that a user equipment wants to access.