Abstract: This method is implemented within a digital processor by: a) searching an internal register (R1, R2, R3, ... R(n)) of the processor which content (b0, b1, b2, ... b(n)) changes over time; b) extracting at a given time n bits from the register, n ? 1; c) using the n bits extracted at step b) as bit(s) for forming a random number of N bits to be generated; d) reiterating (250) steps a) to c) until obtaining the N bits of the random number; and e) providing the random number to an application circuit or software. In order to increase randomness, the method further comprises a selection (240), by a random of pseudo-random process, of the n bits of the register which will be extracted, and/or a selection (230), by a random of pseudo-random process, of one register among a plurality of internal registers (R1, R2, R3, ...

Abstract: A random number generator is implemented within a digital processor by: a) searching an internal timestamp register which counts clock pulses for sequencing the processor; b) extracting at a given time n bits from the least significant bits of the register, n>1; c) using the n bits extracted at step b) as constituent bit(s) of a N-bit random number (34) to be generated; d) reiterating steps a) to c) until obtaining the N bits of the random number; and e) providing the random number to an application circuit or software.

Abstract: A system, including methods and compositions, for treatment of ischemia.

Abstract: A method for extending the life of the attachments that attach blades to rotors, particularly for aerojet engines. Such a method is notable in that it employs intensive ultrasonic peening of the grooves and of the roots of the blades, this peening being performed with an Almen intensity at least equal to F8A, so as to increase the compressive prestress in the contact surfaces without increasing the roughness of these surfaces.

Abstract: The invention relates to a method for the ultrasonic peening of annular recesses for the attachment of blades to a rotor rim, these recesses including a blade introduction opening. According to the method, a plurality of beads is placed on a vibratory surface of a sonotrode, arranged in an intermediate position in a sleeve having opposed closing-off means capable of sliding in the recess, the introduction opening is placed facing the sonotrode, the sonotrode and the sleeve are moved together toward the introduction opening into a peening position in which the closing-off means face the recess ends opening into said opening, then the rotor rim is turned about its axis so as to bring the closing-off means into a first end of the recess so as to form a closed chamber containing the beads. The rim is turned and the vibratory surface is vibrated to mobilize the beads within the chamber, thereby peening the recess.

Abstract: The invention relates to an apparatus and to a method for the surface treatment and compressive prestressing by peening of a wall of at least one oblong cavity formed in a part, said cavity opening to the outside via a lateral mouth and having two ends presenting frontal openings. The wall of the cavity is ultrasonically peened by mobilizing a plurality of beads in a chamber delimited by said wall of said cavity, a vibratory surface closing off said mouth of said cavity, and closing-off means closing off said openings, by means of a sonotrode excited by means for producing ultrasonic oscillations. The method and the apparatus are particularly intended for treating a turbine disk comprising a number of axial recesses formed in the periphery of said disk and having wall portions which diverge from each mouth.

Abstract: A method for peening the tops of cooled blades which include cooling air passage orifices. Peening is performed by mobilization of a plurality of beads in a sealed chamber containing at least one blade tip. The plurality of beads is mobilized by the active surface of a sonotrode which delimits part of said chamber. The beads have a diameter greater than that of the cooling air passage orifices.

Abstract: The invention relates to an apparatus and to a method for the surface treatment and compressive prestressing by peening of a wall of at least one oblong cavity formed in a part, said cavity opening to the outside via a lateral mouth and having two ends presenting frontal openings. The wall of the cavity is ultrasonically peened by mobilizing a plurality of beads in a chamber delimited by said wall of said cavity, a vibratory surface closing off said mouth of said cavity, and closing-off means closing off said openings, by means of a sonotrode excited by means for producing ultrasonic oscillations. The method and the apparatus are particularly intended for treating a turbine disk comprising a number of axial recesses formed in the periphery of said disk and having wall portions which diverge from each mouth.

Abstract: The invention is directed to a membrane fuel pump for an internal combustion engine equipped with a membrane carburetor. The engine is that of a working apparatus and especially a handheld portable tool such as a motor-driven chain saw or the like. The membrane pump includes a drive chamber charged with the pressure inside the crankcase of the engine and a pump chamber separated from the drive chamber by a membrane. The pump chamber is connected at its suction end to a fuel tank via a first check valve and is connected to a pressure controller of the membrane carburetor at its pressure end via a second check valve. The pressure end of the membrane pump is connected with the suction end thereof via a bypass and a throttle is mounted in this bypass. With the throttle bypass between the pressure end and the suction end, the pumped volume is reduced at idle and the pump pressure is smoothed. Disturbances at the membrane carburetor are avoided.

Abstract: This alternator comprises an assembly of rotors (2), including a common shaft (3) on which are fixed a first rotor (4) having permanent magnets and a second, homopolar rotor (5), this assembly being disposed in a common stator whose power windings (7) surround the two rotors (4,5). An excitation coil (6) is disposed in confronting relation to the homopolar rotor and is supplied with direct current or alternating current as a function of the speed of rotation of the rotor assembly. In this way there is produced a magnetic flux which is added to that produced by the permanent magnets or is subtracted therefrom so as to maintain the output of the alternator constant.