Abstract: The invention relates to a combustion chamber containing a number of aerohanical injectors mounted in the end of the chamber that connects the upstream end of two annular walls and which are supplied with fuel permanently during operation. The injectors are arranged in two concentric rows around the axis of symmetry and in pairs in longitudinal planes passing through the axis of symmetry. The injectors of the two rows are more or less equidistant from the outlet of the chamber and have axes directed toward the outlet. A carefully considered distribution of the primary holes, dilution holes and the air flow allows the emissions of oxides of nitrogen to be reduced.

Abstract: A fuel injection system is disclosed for a gas turbine engine having a fuel injector issuing a primary fuel flow during all operating modes of the gas turbine engine and a secondary fuel flow when operating parameters of the gas turbine engine exceed predetermined values. The fuel injection system includes a first air swirler, a second air swirler located rearwardly of the first air swirler and a venturi having a wall with a converging-diverging inner wall surface forming a venturi throat, the venturi being located such that the wall separates first and second air flows issuing from the first and second air swirlers and such that the primary fuel flow emanating from the fuel injector in a conical configuration does not impact against the inner wall surface of the venturi.

Abstract: A clamping collar (10) constituted by a semi-rigid wire that is rolled up to form at least one turn (11) with a first end (12) thereof being provided with a hook (16) extending transversely to the plane of the turn and with a second end (14) thereof being folded back outwardly to form an extension (26) lying substantially in the plane of the turn. The extension (26) includes a fastening fold (28) forming a setback going towards the center of the turn, and it also includes a pre-fastening fold (32) situated between that end (24) of the extension (26) which is connected to the turn (11) and the fastening fold (28), said pre-fastening fold being analogous to the fastening fold.

Abstract: An annular combustion chamber is disclosed for use in a gas turbine engine, the combustion chamber having an axis of symmetry, an inner annular wall, an outer annular wall, and a forward end extending between the inner and outer wall to form boundaries for the combustion chamber. The forward end of the combustion chamber has an inner ring member extending about the axis of symmetry and an outer ring member extending about the axis of symmetry and radially spaced from the inner ring member, the inner and outer ring members forming inner and outer boundaries of an annular chamber that diverges in a rearward direction. The inner and outer ring members are interconnected by a plurality of circumferentially spaced apart spacers so as to form a plurality of arcuate openings between adjacent spacers.

Abstract: A clamping collar constituted by a rolled-up first metal strip portion referred to as an "inner" portion and having two radial folds in the vicinity of one of its ends forming a "lug", and by a second strip portion referred to as an "outer" portion, which is fixed at its first end to the outside face of the inner portion, which has an undulation forming a reserve of resilience, which is provided at its second end with a hook suitable for engaging behind the lug while the collar is being clamped, and which includes an "intermediate" part situated between the undulation and the hook and extending substantially along the periphery of the inner portion which thus has a covered zone covered by said intermediate part. The collar includes first and second abutment means formed respectively on the intermediate part of the outer portion and on the covered zone of the inner portion and suitable for co-operating with each other to set a limit on use of the reserve of resilience.

Abstract: The invention relates to purified proteins induced in human cells by interferon .alpha. or .beta., RNAs, DNAs and hybrid vectors coding for said proteins, hosts transformed with such a hybrid vector, processes for the preparation and purification of these proteins, DNAs, vectors and hosts, monoclonal antibodies specific to these proteins, monoclonal antibody derivatives, hybridoma cell lines secreting these monoclonal antibodies, the use of the monoclonal antibodies and their derivatives in the qualitative and quantitative determination of these proteins, test kits containing the monoclonal antibodies, and pharmaceutical preparations containing said proteins. A protein of the invention shows antiviral properties ascribed to interferons and may be a valuable indicator of the cell response to an interferon therapy.

Abstract: A bypass engine including a fan which has its blades disposed in both the imary gas flow path and the secondary gas flow path of the engine is provided with an annular intermediate gas flow path in the space between the primary and secondary flow paths, and gas take-off means is connected to a compressor of the engine and arranged to direct a flow of gas longitudinally along the intermediate flow path to prevent leakage of hot gas to the secondary flow path via the gaps existing between the platforms of the fan blades and the adjacent annular members of the primary and secondary flow paths.

Abstract: A connected document such as a school book, catalog, etc . . . separable in independent detachable portions, so as not be have to transport but the useable portion or portions to be able to file, reclassify, replace, complete these independent subassemblies without having to manipulate all of the document, comprised by a cover and detachable portions (1) such as notebooks, magazines, pockets for loose-leaves, provided with securement elements coacting in a detachable manner with complementary reception elements secured to the cover of the document, characterized by the use, to ensure the securement of the detachable portions (1), of staples (2) or pins (3) secured to the back of these portions (1) by the use of resilient receives (4) fixed within the back of the cover, in combination with recesses (5) provided in the staples (2) or pins (3) adapted to be engaged in the receivers (4).

Abstract: A device for actively controlling combustion instabilities and for decoking uel injectors comprises at least one detector for measuring pressure fluctuations in a combustion or afterburner chamber, means for processing the signal output by the detector and providing, in turn, a control voltage, and at least one piezoelectric device which is disposed in a hydraulic line including a fuel injector for the supply of fuel to the combustion or afterburner chamber and which is responsive to the control voltage to generate pulses in the flow of fuel from the outlet of the fuel injector.

Abstract: A combustion chamber, particularly for a turbomachine, has at least one generally axially extending wall provided with a plurality of through holes defining a multi-hole cooling system for the wall. The wall also has a plurality of dilution holes which affect locally the flow of burnt gases in the chamber, and the cooling through holes are oriented according to the local flow of burnt gases in the chamber. In particular the wall is subdivided into first zones, downstream of the dilution holes, in which the through holes are oriented substantially in countercurrent to the overall flow direction of the burnt gases in the chamber, second zones and third zones which are disposed on opposite sides of the first zones and in which the orientation of the through holes is inclined both axially and circumferentially, and a fourth zone covering the remainder of the wall and in which the through holes are inclined axially in the overall flow direction of the burnt gases.

Abstract: The invention relates to purified proteins induced in human cells by interferon .alpha. or .beta., RNAs, DNAs and hybrid vectors coding for said proteins, hosts tranformed with such a hybrid vector, processes for the preparation and purification of these proteins, DNAs, vectors and hosts, monoclonal antibodies specific to these proteins, monoclonal antibody derivatives, hybridoma celll lines secreting these monoclonal antibodies specific to these proteins, and their derivatives in the qualitative and quantitative determination of these proteins, test kits containing the monoclonal antibodies, and pharmaceutical preparations containing said proteins. A protein of the invention shows antiviral properties ascribed to interferons and may be a valuable indicator of the cell response to an interferon therapy.

Abstract: A sealed coupling comprises first and second endpieces. Beyond its end, the first endpiece has a U-shaped axial extension provided with a transverse groove. The second endpiece is provided with a radially outwardly extending and substantially circular flange. The flange is suitable for being engaged in the groove during relative transverse displacement of the two endpieces. The end of one of the endpieces is provided with a circular sealing gasket. The second endpiece has a resilient collar with a radial face that bears against the second radial wall of the groove, and one of the two endpieces has a projection situated for penetrating into a setback in the other endpiece.

Abstract: A method of preventing instabilities due to combustion in a multi-flow turbojet engine including an afterburner into which an air-fuel mixture is injected in proportions measured in richness terms, which includes the steps of detecting experimentally, when tuning the turbojet engine, the zones of vibrations due to afterburn as a function of the operating conditions of the engine and as a function of the afterburn operating region, and selecting operating points for regulating the fuel richness of each flow to enable the detected vibration zones to be avoided.

Abstract: A method for manufacturing a ring for swaging from a continuous metal strip includes stamping strip ends to about one-half the thickness of the metal strip. Studs are formed on the ends of the strip. The displaced metal is trimmed from the ends to maintain a uniform width. The strip of metal is cut between adjacent strip ends. The strip is then rolled until the ends of the metal strip are abutted, the compressed strip ends forming a housing for receiving a plate. Plates are fabricated to fit in the housing. Each plate includes corresponding holes for receiving the studs on the strip ends. The studs are riveted in the holes to secure the ring. The holes may be formed on the strip ends and the plate can be formed with studs to secure the ring.

Abstract: A screw comprising, in succession between a first end and a second end thereof: a first polygonal head; a breakable neck; a second polygonal head; and a threaded shank; the diameter of the breakable neck being smaller than the diameters of the heads and of the shank, the screw further comprising a cylindrical bearing surface portion situated between the breakable neck and the second head, and having a diameter not less than that of the breakable neck, but less than that of the second head. A tool for tightening such a screw comprises a tightening endpiece including resilient means that project radially into the inside of the tube while they are in the free state, and that are capable of retracting to allow the first head of the screw to be inserted as far as the engagement portion of the tube and to co-operate with the cylindrical bearing surface portion of the screw when the first head thereof is in said engagement portion.

Abstract: The present invention relates to a process for shrinking a ring to be shrunk, placed around an object to be clamped on a cylindrical support and behind an axial obstacle connected to said support. The process comprises the following steps of: a) fitting a shrinking tool around the support, over the axial obstacle, until its jaws in expanded position are disposed in the radial plane of the ring to be shrunk, b) positioning in the jaws, by the rear of the axial obstacle, a spacer presenting a central opening adapted to the ring to be shrunk, and c) finally, tightening the shrinking tool to bring the jaws and the spacer that they contain in their retracted positions.

Abstract: A clamp fitting is formed by a metal band wound on itself. One end of the band presents an ear radially projecting on the outer periphery of the clamp. The other end of the band is shaped as a hook capable of hooking behind the ear to maintain the clamp in a tightened position. After hooking, on the face of the metal band located opposite the hook bearing zone, the ear is provided with a member integral therewith and of which a zone is capable of coming into stop contact with the inner face of the hook when the latter is being hooked on the ear. This additional contact with the inner face of the hook prevents any relative displacement of the hook with respect to the ear and consequently any increase in the tightening of the clamp.

Abstract: This invention relates to a connector of a quick connection allowing tight connection of a rigid tube provided, at some distance from its free end intended to be fitted in the inlet of the connector, with a bead projecting radially with respect to the outer surface of the tube and presenting a substantially radial side opposite said end. The connector presents a first inner housing comprising an O-ring capable of coming into contact with the outer surface of the tube between its free end and its bead and a second inner housing to receive a locking ring elastically deformable in the radial direction. The locking ring is formed by a thin metal band presenting a generally oblong profile, the central region of said ring being constituted by substantially cylindrical portions whose diameter in the free state is at the most equal to the diameter of the tube.

Abstract: A clamp fitting is formed by an internal segment of metal band wound upon itself, and an external segment of metal band formed about a portion of the internal segment. The internal segment extends for more than one complete circumference such that the outer end of the internal segment overlaps the internal end of the internal segment to form a continuous internal surface. The outer end of the internal segment presents an ear formed by two folds of band placed back to back and projecting radially on the outer periphery of the clamp. The external band segment extends only for a partial circumference. One end of the external segment is attached to the outer face of the internal segment. The other end of the external segment is shaped as a hook capable of hooking behind the ear to maintain the clamp in a tightened position.

Abstract: A quick connector is provided for connecting a tube inserted into a connection element. The tube includes an annular swell spaced at a distance from its end. The connector housing of the connection element is provided with a locking member and locking ring elastically deformable in a radial direction between a free state configuration and an unlocking configuration. The outer periphery of the connector housing has two cylindrical parts separated by an axial stop. The locking ring abuts the axial stop. A locking lug is connected to the locking ring and includes a front ramp with a transverse slot. A spacer deforms the locking lug in a radially outward direction to the unlocking configuration. When the tube is fitted in the connection element, the front ramp of the locking lug cooperates with the swell of the tube to move the lug apart. When the tube has been fitted in the connector and the slot is at the axial level of the swell, the locking lug approaches its free state configuration.