A method for converting a compound data word 10 into a modified data word. The nano-membranes can be sensitized to respond to a single target compound, or different portions of the nano-membrane can be differently sensitized. A receiver includes at least two antenna coils situated to detect orthogonal components of the magnetic field. Respective coolant flow paths extend from the valley to a section of each cylinder bore water jacket adjacent each cylinder exhaust duct. A passage 25 that allows air to pass therethrough is provided in an intermediate portion of the handle portion 2, and an ion generator 9 that generates positive and negative ions to be released into the passage 25 is provided in the handle portion 2 in a base end portion thereof.