Abstract: This invention relates to a heat exchanger for electronic components and electrotechnical equipment, comprising a box defining an interior space through which a heat-transfer fluid passes, at least one face of said box oriented towards said components or equipment being covered with an electrically insulating plate, characterized in that said box and said plate are overmoulded with a covering of electrically insulating material and in that a spacer for expansion is disposed between said box and said insulating plate.

Abstract: A method of manufacturing metal alloys to obtain a homogeneous powder made up of oxides of the metals and applications thereof to the manufacture of semiconductors and superconductors comprises, after placing the various metals selected in a crucible, melting the metals in a neutral or reducing atmosphere while stirring the liquid to homogenize it, recovering the liquid alloy, spraying the alloy obtained to form homogeneous powder particles of determined particle size, and oxidizing the particles. It applies to the manufacture of zinc oxide-based varistor type semiconductor ceramics and to the manufacture of superconductor products or positive or negative temperature coefficient thermistors.

Abstract: A device for the production of ink droplets as required includes a nozzle fed with liquid through a pipe connected to a tank and associated with a pressure transducer which produce pulsations in the liquid. The pressure transducer exhibits an internal cavity of very small volume with an inlet and an outlet for the liquid which is lying directly in contact with the wall of the material of the pressure transducer, this inlet being connected to the tank of liquid and to the outlet feeding the nozzle.