Abstract: The invention relates to a device for circulation of a gaseous and/or liquid fluid through at least one solid particle bed equipped with at least one bypass means acting on at least one part of said fluid through at least one part of a solid particle bed, said bypass means comprising: a pipe whose top end discharges above the upper surface of the catalyst bed and whose bottom end discharges below said surface, and a valve that is made to be actuated in the open position when the differential pressure through the solid particle bed is greater than a predetermined value, said valve including means allowing the automatic variation of the passage section of the fluid based on the fluid flow rate.

Abstract: A thermoelectric generator comprising a plurality of semi-conductor elements of type n an type p alternatingly disposed and connected at the ends thereof to form a plurality of thermocouples on two opposite faces of the generator, said elements being thin polycrystalline semi-conductor ceramic layers deposited on a microporous support by means of serigraphy and fixed to said support by sintering.