Abstract: Sectors (16) of synchronizing ring blades are maintained against tangential rotational movements by sliding into the grooves (18) of a casing (15) by pins (23) passing through perforations in the extension of said two parts, and prevented from accidental removal either by a flexible lock ring (24) or by a locking tab (26) maintained between the two parts when they have been completely assembled.

Abstract: The invention relates to an active antenna panel comprising an array of n radiating elements and a multilayer-structure m-beam distributor designed to feed the n radiating elements, the distributor having first “formation” layers for supporting beam-forming means, and second “connection” layers designed to support first electrical connection means for interconnecting the first layers, and second electrical connection means for connection to the radiating elements. In the invention the forming layers extend substantially perpendicularly to the main plane of the antenna, the forming layers and the connection layers are assembled together by molding so that the beam distributor constitutes a single block, and the radiating elements are connected directly to the second connection means.

Abstract: A process for preparing stable emulsions of polyelectrolytes of high molecular weight as reverse emulsion, in which:the monomers are dissolved in an aqueous phase,an organic phase containing a surface-active agent is prepared,these two phases are mixed to obtain an emulsion of the water-in-oil (W/O) type,the monomers are polymerized,the emulsion is incorporated to obtain a water-in-oil (W/O) emulsion, so as to make the polyacrylamide obtained water-soluble, which consists in adding to the aqueous phase a soluble polymer of low molecular weight, of the same general chemical nature and of the same ionic nature as the polyelectrolyte of high molecular weight which is envisaged.Envisaged application: preparation of polyacrylamide for flocculation and/or thickening applications (urban and industrial water treatments, papermaking).