Abstract: After sampling and conversion into digital values, the digitalized temporal samples of the received code signal (SC) are subjected to a fast Fourier transformation, and the information items (FFT) representing the frequencies of the transform are processed automatically in such a manner as to compare spectra of the transform with stored theoretical values for each possible code signal, in order to determine a set of information items called "conversions" (M1-Mn), from among which a selector then selects a particular "conversion" (MSO) which will reliably identify the received code signal and will activate a display device.

Abstract: This hooking device is fastened to the choke plug (8) for guide tube (2). comprises of catches (54) regularly arrayed along the periphery of the flange (9) of the choke plug (8) and hooks to the upper spacer (4S) of the guide tube (2). It is kept in the engaged position by a spring system (56-58), 63-65) and can disengage by means of a tool means comprising a roller (77) acting on each catch (54) and a rim (68) resting on a muff (56) acting as a rest also for the spring (57).

Abstract: In a microbiological process for the elimination of nitrates from an aqueous liquid, the liquid to be denitrified passes through a first reaction zone containing a denitrifying biomass which utilizes hydrogen and into which hydrogen gas is injected. Effluent from the first reaction zone is introduced into a second reaction zone containing a nitrifying biomass which is also contacted by an oxygen-containing gas.

Abstract: A load selector has an insulating cylinder, provided with fixed selector tacts inverting contacts and common point rings, in the interior of which is displaced a drive crankshaft on which are supported commutator modules. The drive crankshaft includes a male coupling element, a female coupling element associated with an upper crank, an off-center tube and a lower crank. A rolling mechanism serves as a lower bearing, and a rolling mechanism serves as the upper bearing. A drain tube is coupled to a central siphon tube which leads to an outlet formed in the lower crank.

Abstract: Each swiveling yoke (3) of a movable element 1 includes a stem 16 concent with a shaft 6 around which moves the swiveling yoke 3 and connecting the two arms 17 between which a roller 4 is free to rotate about a shaft 11; the outer surface of the stem 16 acts as a friction surface for a friction piece 18 comprising an elastic blade 19, a bead 20 made of a good electrically conducting material and a cable 27 connected by a cable terminal 26. The elastic blade 19 rests on two cross-pins 22 and 24 inserted into insulating plates 23.

Abstract: In a simulator for training airplane pilots comprising a base positioned on he ground (24), a platform supporting an airplane equipment station of which the interior reproduces the interior of a real cockpit (17) and an assembly of jacks (15) and scissors (16) disposed between the base (24) and the platform and actuated by means of a hydraulic control system, the platform is replaced by a cross-braced self-supporting structure in the form of a basket (18), the base of which coincides with the base of the simulated cockpit (17) and the upper edge of which is located approximately at the height of the lower edges of the windows of the simulated cockpit (17), the jacks (15) and the scissors (16) connecting the base to the structure (18) being fixed in at least three places in proximity to the upper edge of the said structure (18) and being directed toward the base (24), mounted on the ground, in spaced apart relationship from said structure.