A cavitation device is used to heat, concentrate and recycle or otherwise reuse dilute and other oil well fluids, brines and muds, and solution mining fluids, all of which commonly contain ingredients worthy of conservation. The method may include identifying a first time period during which a user accesses electronic messages less than during a second time period. The marking head is then rotated through 90\xb0 and held at one side of the conveyor so that a second, perpendicular, surface of the object can be marked as the object is conveyed past the marking head. An amount of charge stored on the floating gate of a given floating-gate transistor determines the memory value and, consequently, the state to which a fuse settles upon power-up or reset of the fuse.