A lubricating system for an internal combustion engine includes a recovery pump by which a lubricating oil dropping to and dwelling in a bottom portion of a crankcase after lubricating individual portions of the internal combustion engine is sucked through a pump suction port opened in the bottom portion of the crankcase and is fed to a lubricating oil tank. The data is weighted at the transmitter by a weight matrix derived from channel related data corresponding to the sub-carrier. A ramp generating module receives the selected clock signal and generates a ramp signal. Optionally, a copolymerization reaction between an alpha-olefin and \u201cT\u201d reagent takes place initially to incorporate some \u201cT\u201d molecules in the polyolefin main chain, and the incorporated \u201cT\u201d units then behave as chain transfer agents for reacting with the propagating polyolefin chains to form side chains. In the method, a DC voltage is applied to at least one of the at least two first electrodes and the at least one second electrode, so that a change of the resonant frequency results due to a change to the extension in the one spatial direction and the elasticity modulus.