An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. In addition to increasing engine output power, cold air intake also reduces engine pre-ignition thereby reducing emissions. Copper andor aluminum nanoparticle compositions formed may be used for lead-free soldering of electronic components to circuit boards.