Abstract: A particular object of the present invention is apparatus having a perfectly known laser equivalent surface and able to measure the performance of an active detection unit, characterized in that said apparatus comprises a radial attenuator to limit the apparatus' aperture and exhibiting a radial transmission function represented by a bell-shape curve.

Abstract: A high-voltage spark gap device for operation in conjunction with a high-power electric generator and including an electric trigger system and at least two mutually spaced spherical main electrodes that cooperate pairwise and face each other, means for closing the current loop that are separated by a dielectric from the electrodes, the electric trigger system having as many trigger electrodes as there are main electrodes, the trigger electrodes being fitted with an insulating protector received in each main electrode of the device.

Abstract: The invention relates to a wall feedthrough, in particular for a metal wall and for a high-voltage coaxial cable, said feedthrough comprising an insulating socket which is affixed to the wall and which includes a central segment, an upstream end and a downstream end, said ends each projecting on its side from the wall.

Abstract: An absorption device absorbs vibrations generated by an electric motor that is built into a propulsion pod of a ship. The propulsion pod contains an electric motor that is cooled by circulation of a radial airflow within the propulsion pod. The electric motor rotationally drives at least one propeller through a transmission shaft. The absorption device is disposed in the propulsion pod to position and hold the electric motor inside the propulsion pod and also to filter the vibrations emitted by the motor and channel the motor cooling airflow circulation.

Abstract: The invention relates to a wall feedthrough, in particular for a metal wall and for a high-voltage coaxial cable, said feedthrough comprising an insulating socket which is affixed to the wall and which includes a central segment, an upstream end and a downstream end, said ends each projecting on its side from the wall. The insulating socket allows passing a cable inner conductor through it, and the feedthrough furthermore includes primary mechanical fasteners at the downstream socket end which cooperate with secondary mechanical fasteners affixed to the sheathed part of the cable. This feedthrough is characterized in that the cable's inner conductor is electrically insulated from the wall by pre-stressed electric insulators.

Abstract: The invention concerns an autonomous container ship comprising a bottom, a propulsion system, a loading and unloading system for loading and unloading containers, a balancing system, characterized in that the bottom has a hull incorporating a propulsion system and the ship comprises a carrying system for transporting containers from important ports equipped with facilities for loading and unloading containers to small ports not provided with such equipment and less than 4 meters deep. The ship includes a propulsion system ensuring the ship's cruising speed on the high seas and its speed in estuaries and ports, a loading and unloading system adapted to ports not provided with appropriate equipment, and a balancing system for balancing the ship at sea providing stability and trim during container handling operations.

Abstract: An electromagnetic device for producing cold neutral atoms having a ferromagnetic structure with four poles disposed in the same plane XOY excited by main coils (the quadrupole) supplying the main excitation, and two additional poles (the dipole) oriented along an axis Z and perpendicular to the plane of said four poles, the poles being magnetically coupled by one or more yokes.

Abstract: A container ship includes a hull, propulsion device, support, guide disposed on the support that is extendible beyond the hull, and handler movable along the guide. Thus, the container ship enables containers to be unloaded near a variety of points of use, i.e., not only in ports that are not equipped with port handling facilities, but also onto unequipped beaches, banks, or landing slips. The container ship also unloads containers in such a manner that it has practically no effect on the equilibrium of the ship, whatever its size.

Abstract: The present invention relates in particular to an autonomous container ship of the type having a hull, propulsion means, and loading and unloading means, characterized by having ballasting means and means (11, 12, 5) for varying the air draft without changing the draft.

Abstract: The present invention relates in particular to a method for generating a digital signature (c, d) of a message M as well as a method for authenticating such a signature having the steps of defining a modulo N and a base g, a public key Y, and a private key x, these parameters N, g, Y, and x being linked by the relationship Y=gx (mod N), defining a hash function H the size of whose result has S bits, choosing a number r of T bits with T>=2S, calculating u from the following relationship u=gr*Yz where Z=2s, hashing the concatenation of M and u, by function H, the number thus obtained being the value c of the signature, and calculating the value d of the signature by the relationship: d=r+c*x.

Abstract: The present invention relates to a connection system for electrical cables which operate under vacuum and carry high-voltage electric pulses or currents. This connection system comprises a grounded outer metal shell connected to the cables' metal sheath and a dielectric insulating sleeve, said sheath and sleeve enclosing the cables to be connected, and said system is fitted with seals allowing subtending a sealed cavity between the cables' insulating sleeve and insulating sheath.

Abstract: The object of the invention is a high-voltage spark gap device operated in conjunction with a high-power electric generator and comprising an electric trigger system and at least two mutually spaced main electrodes. These main electrodes in particular are spheres and cooperate pairwise and face each other. This spark gap device furthermore comprises means to close the current loop and separated by a dielectric from the electrodes, said device being characterized in that the electric trigger system comprises as many trigger electrodes as there are main electrodes in it, said trigger electrodes being fitted with an insulating protector received in each main electrode of said device.

Abstract: The invention relates to a wall feedthrough, in particular for a metal wall and for a high-voltage coaxial cable, said feedthrough comprising an insulating socket which is affixed to the wall and which includes a central segment, an upstream end and a downstream end, said ends each projecting on its side from the wall.

Abstract: The present invention relates in particular to an autonomous container ship of the type having a hull, propulsion means, and loading and unloading means, characterized by having ballasting means and means (11, 12, 5) for varying the air draft without changing the draft.

Abstract: The invention relates to a method enabling the existence of a biological activity of microorganisms to be determined quickly by applying an electric field. The inventive method includes the following: the microorganisms are placed in a suspension in a dielectric oil, an electric field is applied to said suspension and variations in the strength of the leakage current induced as a function of the applied electric field are measured. The device according to the invention comprises a container which is fitted with electrodes (2), whereby the suspension (3) of microorganisms in a dielectric oil is placed therein, in addition to means for generating an electric field between two or several electrodes, measuring means and means for recording the induced leakage current.

Abstract: A triboelectric device includes a voltage source, a polarizing amplifier, and electrodes to apply a polarizing voltage to a first material of the device. The electrodes are not fixed to the first material, allowing relative rubbing displacement between the electrodes and the first material. Preferably, a conductive second material, such as petrolatum, is provided between the first material and the electrodes. Such a device can have its properties change while in service. To accommodate this, the voltage source preferably provides an adjustable polarization voltage. The triboelectric device is useful as a transducer, and particularly useful as a hydrophone used in sonar antenna, as its mode type can be changed in the field during service to correct spurious signals or interferring noises.

Abstract: The invention concerns an autonomous container ship comprising a hull, a propulsion system, loading and unloading systems for loading and unloading containers, and a balancing system. The ship transports containers from larger ports equipped with facilities for loading and unloading containers to smaller ports which may not provide such equipment and may be less than 4 meters deep. The ship includes a propulsion system to propel the ship to cruising speed on the high seas and at lower speeds in estuaries and ports, loading and unloading systems adapted to ports not provided with appropriate equipment, and a balancing system for balancing the ship at sea by providing stability and trim during container handling operations.

Abstract: An electromagnetic device for producing cold neutral atoms having a ferromagnetic structure with four poles disposed in the same plane XOY excited by main coils (the quadrupole) supplying the main excitation, and two additional poles (the dipole) oriented along an axis Z and perpendicular to the plane of said four poles, the poles being magnetically coupled by one or more yokes.

Abstract: A heat target for producing, in particular, a thermal image composed of several bands and having at least one layer of electrically conducting material connected to two electrodes that are connected to means able to generate a potential difference between them, the target further comprising at least one module resting on a support and forming all or part of a band the at least one module having at least two longitudinal faces and a supporting structure on all or part of which rests a layer made of the electrically conducting material connected to two electrodes connected to means able to generate a potential difference between them.

Abstract: A piezosensitive device includes a material and a device that applies a polarizing voltage to the material. Embodiments of the material are piezosensitive only when a polarizing voltage is applied to them. The device can be used, for example, in electromechanical transducers of sonar antennas.