Abstract: An isolation region separates a first circuit region and a second circuit region. A signal conveyance element is an element to convey a signal from the first circuit region to the second circuit region and includes at least one primary coil and two secondary coils. The at least one primary coil has opposite ends electrically connected to the first circuit region and is disposed in the isolation region. The two secondary coils each have opposite ends electrically connected to the second circuit region, are arranged to be magnetically coupled to the at least one primary coil, and are arranged in the isolation region.

Abstract: A method for producing an alkenylbenzene by catalytically dehydrogenating an alkylbenzene non-oxidatively in the presence of steam in the reaction zone comprising a fixed-bed of potassium-containing dehydrogenation catalyst particles, wherein the potassium-containing dehydrogenation catalyst particles are prevented from powdering by (a) using a fixed-bed comprising particles of at least two kinds of potassium-containing dehydrogenation catalyst with respectively different potassium contents and (b) arranging the catalyst particles so that those with higher potassium content are not disposed on the inlet side of said catalyst bed with respect to the reaction.