Abstract: A ship having a length to width ratio smaller than two and including a superstructure and at least two hulls, the superstructure forming a wing able to generate an aerodynamic lift comprised between 20 and 90% of the weight of the ship at a cruising speed thereof, the wing including curved ends connected to each of the hulls and having a developed surface of an extrados of the wing substantially equal to the product of the length by the width of the ship, wherein a point for application of the aerodynamic lift generated by the superstructure is situated behind the center of gravity for application of the gravitational forces on the ship, and a point for application of the resultant of the hydrodynamic forces generated by the hulls is situated in front of the center of gravity.

Abstract: The invention relates to a method for acquiring seismic data at a plurality of positions spread out over a zone on the seabed which includes transmitting acoustic waves in the water layer above the zone by a plurality of sources, for each of the acquisition positions, dropping from the surface a seismic acquisition equipment, the equipment comprising a seismic acquisition unit and autonomous guiding equipment adapted to receive while descending acoustic signals from the sources and to control its trajectory according to the received acoustic signals so as to direct said equipment towards said position, performing the seismic acquisition, causing the acquisition equipments to move up to the surface, and retrieving the acquisition equipments on the surface.

Abstract: A method and device for the remote collection of data from aircraft or ship recorders, using a buoy (3) which may be ejected in the event of sinking and contains a double memory which stores the positions of the buoy during the drift thereof as well as information relating to the flight or crossing. A two-way radio communication means allows the buoy to transfer the contents of said memories to a remote collection means, which is a reconnaissance aeroplane.

Abstract: A device for heating a cylindrical component of given diameter is disclosed. The device includes at least two heaters each delivering a stream of hot gas and emerging in an annular chamber. The inside diameter of the annular chamber is slightly greater than the diameter of the cylindrical component. The device may be used for heating a metal journal in which a bearing ring for an inter-shaft bearing in a double-body turbomachine is mounted.

Abstract: A method and device for the remote collection of data from aircraft or ship recorders, using a buoy (3) which may be ejected in the event of sinking and contains a double memory which stores the positions of the buoy during the drift thereof as well as information relating to the flight or crossing.

Abstract: A seismic streamer incorporates apparatus for controlling its depth of immersion for modifying and maintaining its degree of immersion, wherein, the streamer being designed for stationary use and including a power supply network, the immersion control apparatus comprises a plurality of variable buoyancy ballasts connected to the power supply network of the streamer and installed at regular intervals along the seismic streamer and each associated with a microcontroller for at least controlling buoyancy of the corresponding ballast, a plurality of pressure sensors also installed at regular intervals along the streamer, at least one receiver for one or more desired value instructions, a bus for distributing the one or more desired value instructions to the ballasts, the microcontroller associated with a given ballasts being adapted to receive at least signals originating from at least one pressure sensor located in the proximity of the ballast and instruction signals originating from the receiver for instruction

Abstract: The invention relates to a method for acquiring seismic data at a plurality of positions spread out over a zone on the seabed which includes transmitting acoustic waves in the water layer above the zone by a plurality of sources, for each of the acquisition positions, dropping from the surface a seismic acquisition equipment, the equipment comprising a seismic acquisition unit and autonomous guiding equipment adapted to receive whilst descending acoustic signals from the sources and to control its trajectory according to the received acoustic signals so as to direct said equipment towards said position, performing the seismic acquisition, causing the acquisition equipments to move up to the surface, and retrieving the acquisition equipments on the surface.

Abstract: A device for heating a cylindrical component of given diameter is disclosed. The device includes at least two heaters each delivering a stream of hot gas and emerging in an annular chamber. The inside diameter of the annular chamber is slightly greater than the diameter of the cylindrical component. The device may be used for heating a metal journal in which a bearing ring for an inter-shaft bearing in a double-body turbomachine is mounted.

Abstract: A device for heating a cylindrical component of given diameter is disclosed. The device includes at least two heaters each delivering a stream of hot gas and emerging in an annular chamber. The inside diameter of the annular chamber is slightly greater than the diameter of the cylindrical component. The device may be used for heating a metal journal in which a bearing ring for an inter-shaft bearing in a double-body turbomachine is mounted.

Abstract: The invention relates to a method for acquiring seismic data at a plurality of positions spread out over a zone on the seabed which includes transmitting acoustic waves in the water layer above the zone by a plurality of sources, —for each of the acquisition positions, dropping from the surface a seismic acquisition equipment, the equipment comprising a seismic acquisition unit and autonomous guiding equipment adapted to receive whilst descending acoustic signals from the sources and to control its trajectory according to the received acoustic signals so as to direct said equipment towards said position, —performing the seismic acquisition, —causing the acquisition equipments to move up to the surface, and —retrieving the acquisition equipments on the surface.

Abstract: A method of assembly of a turbomachine that includes a first module and a second module with a second shaft assembled by a bearing, the bearing including an outer ring shrink-fitted inside a journal integral with the first module and an inner ring integral with the second shaft. The second module is assembled on the first module by engagement of the second shaft, with the inner ring, inside the journal. The method includes a step of inserting the second module in the first module up to a determined distance such that the first and second modules are only partially assembled. The second shaft is centered with respect to the journal, the centering being controlled on the basis of measuring distance deviations with respect to a reference on the journal. The journal is expanded by heating its outer surface. After the step of expanding, the second module is displaced inside the first module so as to complete the assembly. This displacement step is started based on a predetermined temperature.

Abstract: The present invention relates to a device for heating a cylindrical component of given diameter, by means of hot gas, characterized in that it comprises at least two heaters (310, 312, 314) each delivering a stream of hot gas and emerging in an annular chamber (316), the inside diameter of which is slightly greater than said diameter. This device is used in particular for heating a metal journal (111) in which a bearing ring (123) for an inter-shaft bearing in a double-body turbomachine is mounted.

Abstract: The invention relates to a method of assembly of a turbomachine, in particular of a gas turbine engine, comprising at least a first module and a second module a second shaft assembled by a bearing, said bearing comprising an outer ring shrink-fitted inside a journal integral with the first module and an inner ring integral with the second shaft, according to which the second module is assembled on the first module by engagement of the second shaft, with said inner ring, inside the journal comprising said outer ring, wherein it comprises the following steps: mating the second module with the second shaft up to a determined distance from the journal, centering the second shaft with respect to the journal, said centering being controlled on the basis of measuring distance deviations with respect to a reference on the journal, expansion of the journal by heating its outer surface, completion of the mating of the second shaft.

Abstract: The invention relates to a method for acquiring seismic data at a plurality of positions spread out over a zone on the seabed. The method according to the invention comprises the following steps: transmitting acoustic waves in the water layer above said zone by means of a plurality of sources, for each of said acquisition positions, dropping from the surface a seismic acquisition equipment, said equipment comprising a seismic acquisition unit and autonomous guiding equipment adapted to receive whilst descending acoustic signals from said sources and to control its trajectory according to the received acoustic signals so as to direct said equipment towards said position, performing the seismic acquisition, causing the acquisition equipments to move up to the surface, retrieving the acquisition equipments on the surface.

Abstract: An underwater acoustic beacon includes a subsystem for determining geographical position, and a transmitter for transmitting coordinates of the position at the point of impact when the beacon is deployed.

Abstract: The invention concerns a temporal and spectral submarine locating method, characterised in that it includes equipping the systems or mobile objects to be located and/or identified, with acoustic transmitters transmitting aperiodic signals with a predetermined pseudo-random sequence; deploying, over the working zone where the systems and moving objects to be located are found, one or several measuring points provided, each with an acoustic receiver, with a time scale reference and a measuring point locater; transmitting to a processing centre data derived from the measuring points where, at every time of detection on a given frequency band, precise dating is associated in a time scale referential with a position of the measuring point in a spatial referential; the whole set of data derived from the different measuring points being assembled at the processing centre to be operated on by level 2 correlation with the pseudo-random reference sequences corresponding to each of the searched transmitters.

Abstract: The invention concerns a temporal and spectral submarine locating method, characterised in that it consists in: equipping the systems or mobile objects to be located and/or identified, with acoustic transmitters transmitting aperiodic signals with a predetermined pseudo-random sequence: deploying, over the working zone where the systems and moving objects to be located are found, one or several measuring points provided, each with an acoustic receiver, with a time scale reference and means for locating said measuring point; transmitting to a processing centre data derived from the measuring points where, at every time of detection on a given frequency band, precise dating is associated in a time scale referential with a position of said measuring point in a spatial referential; the whole set of data derived from the different measuring points being assembled at said processing centre to be operated on by level 2 correlation with the pseudo-random reference sequences corresponding to each of the searched trans