Abstract: The radio system (10) comprises a waveform generator (1) alternately generating an FMCW wave representing a linearly frequency-modulated continuous wave for radar imaging and a CW wave representing a wave kept at a given frequency for measuring a velocity vector, an amplification chain (2), a set (4) of transmit antennas (41, 42, 43), a set (5) of receive antennas (51, 52, 531, 532), a set (7) of receivers (71-2, 731, 732), and a signal processor (9) implementing processing operations on FMCW signals received from the one or more lateral antennas (51, 52) of the set (5) of receive antennas (51, 52, 531, 532) and spectrally analysing CW signals received from the one or more lateral antennas (51, 52) and from the one or more ventral antennas (531, 532) of the set (5) of receive antennas (51, 52, 531, 532) so as to supply SAR images and components of the velocity vector of said airborne vehicle (20).

Abstract: A system for forming beams that are suited to a given coverage, has at least the following elements: a configuration manager, a set of modems in contact with switches, multiplexers for multiplexing the modems by group onto as many intermediate ports each corresponding to a beam, a module for forming pathways generating a number of pathways distributed about the axis of the antenna, a phase-shift module for the beams of each of the pathways, a power transposition-amplification module and at least two antennas connected to said transposition-amplification module. For the reception part, the system comprises a set of modules that are identical with the exception of the transposition-amplification module, which carries out the low-noise reception and the transposition.

Abstract: A very high speed SHF-EHF radio system having a very large capacity of several gigabits comprises at least one ultra-wideband base station and an ultra-wideband and multiuse terminal for very high speed wireless systems providing point-to-multipoint transmission of a plurality of simultaneous waveforms in order to provide a plurality of subscribers or customers of various types with multiple services. The base and the terminal comprise ultra-wideband transmitter/receiver means which are capable of exchanging a plurality of waveforms delivered by multiplexes of various modems. The radio of the base has at least one microwave spectrum generator for the multiplexes optimized for each service and for any type of customer. The transmitter/receiver of the radio of the terminal is suited to operating in the subband of the downlink channel and in at least one of the two-way subbands.

Abstract: A system for forming beams that are suited to a given coverage, has at least the following elements: a configuration manager, a set of modems in contact with switches, multiplexers for multiplexing the modems by group onto as many intermediate ports each corresponding to a beam, a module for forming pathways generating a number of pathways distributed about the axis of the antenna, a phase-shift module for the beams of each of the pathways, a power transposition-amplification module and at least two antennas connected to said transposition-amplification module. For the reception part, the system comprises a set of modules that are identical with the exception of the transposition-amplification module, which carries out the low-noise reception and the transposition.

Abstract: A very high speed SHF-EHF radio system having a very large capacity of several gigabits comprises at least one ultra-wideband base station and an ultra-wideband and multiuse terminal for very high speed wireless systems providing point-to-multipoint transmission of a plurality of simultaneous waveforms in order to provide a plurality of subscribers or customers of various types with multiple services. The base and the terminal comprise ultra-wideband transmitter/receiver means which are capable of exchanging a plurality of waveforms delivered by multiplexes of various modems. The radio of the base has at least one microwave spectrum generator for the multiplexes optimized for each service and for any type of customer. The transmitter/receiver of the radio of the terminal is suited to operating in the subband of the downlink channel and in at least one of the two-way subbands.

Abstract: A multiband microwave transceiver device, MMT, is disclosed. The device includes a circuit for coupling with an antenna, A1, operating in a frequency range G1 corresponding to multimedia services, to rich media services (synchronized image and Internet). A circuit can couple with an antenna, A2, suitable for operating in a frequency range G2 corresponding to Internet and voice services. A circuit can couple with an antenna, A3, suitable for operating in a range G3 and allowing direct operation with a commercially-available WIMAX modem in this band via the BIS frequency. Frequency synthesizers are provided which are suitable for the conversions and amplification and conversion circuits in both directions: Down-conversion from 40 GHz to the BIS frequency; Down-conversion from 10 GHz to the 3.5 GHz; and Up-conversion from 3.5 GHz to the 10 GHz.

Abstract: The method comprises introducing into a reactor including a transparent polymer substrate containing a free plasticizer and the photochromic additive, supercritical fluid and maintaining this fluid in the reactor for the time necessary for incorporating the photochromic additive into the article, removing the supercritical fluid and recovering the ophthalmic article in which the photochromic additive has been incorporated.

Abstract: The method comprises introducing into a reactor including a transparent polymer substrate containing a free plasticizer and the photochromic additive, supercritical fluid and maintaining this fluid in the reactor for the time necessary for incorporating the photochromic additive into the article, removing the supercritical fluid and recovering the ophthalmic article in which the photochromic additive has been incorporated.

Abstract: Polymerizable monomer compositions, transparent polymer substrates and optical and ophthalmic articles obtained.

Abstract: Described is a mold for producing optical lenses from a polymerizable material and a method for such production. Said mold comprises a gasket (1) enclosing an aperture (2), which aperture (2) extends along an axis (14), and providing a contact surface (3) radially extending from said aperture (2), a first molding shell (4) abutting against said contact surface (3), a second molding shell (5) arranged within said aperture (2) at a distance from said first molding shell (4), means (6) for pressing said first molding shell against said contact surface, means (7) for radially pressing said gasket against said second molding shell, and a filling opening, thereby forming a molding cavity (8) that can be filled with molding material between said first (4) and said second (5) molding shell and said gasket (1).

Abstract: A method is described that combines the advantages of the dip-coating method with those of the spin-coating method, whereby at least one liquid coating composition is deposited on a substrate by means of at least one spray nozzle, and wherein said substrate is rotated (spinned) for some time at least after said liquid coating composition has been deposited. This method is particularly suited for the coating of ophthalmic substrates. Furthermore a device suitable for performing such a method is also disclosed.

Abstract: The method comprises introducing into a reactor including a transparent polymer substrate containing a free plasticizer and the photochromic additive, supercritical fluid and maintaining this fluid in the reactor for the time necessary for incorporating the photochromic additive into the article, removing the supercritical fluid and recovering the ophthalmic article in which the photochromic additive has been incorporated.

Abstract: A mold for making an optical lens and formed of two molding shells disposed on edge and an annular closure member around their periphery and defining with them a molding cavity. To fill the mold a molding material is introduced into the molding cavity through a casting opening formed for this purpose in the closure member. The casting opening is in the lower part of the molding cavity.

Abstract: In a method of manufacturing an optical lens from a polymerizable synthetic material a lens molding assembly is provided including two molding shells and an annular closure member disposed around the molding shells and defining therewith a required molding cavity. The mold is filled with molding material and polymerization of the molding material is at least started. The operations of assembling the mold, filling it and at least starting polymerization of the molding material are conducted in the lens molding assembly.

Abstract: A control circuit (10) controls a voltage controlled oscillator (15) to cause the signal at the output of the oscillator to have slopes of frequency variation in accordance with biphase encoded data to be transmitted. The control circuit (10) limits abrupt frequency shifts in the oscillator output signal by inverting a sign multiplying the slope of frequency variation, utilizing an amplifier (50) with a controllable inversion state, in response to whether the state of the data to be transmitted, and a state, indicative of whether a frequency control voltage exceeds a zero threshold at sampling instants synchronous with the biphase data, are the same or different.

Abstract: The arrangement (201) comprises an optical narrow detection beam (203) focussing system for a passive infrared radiation in accordance with a reference plane (U). A filter selects the spectral analysis band and at least one passive infrared radiation detector is provided in the focal plane. According to the invention, the arrangement comprises a first analog processing chain and a second digital processing chain by means of which it is possible to recover in accordance with a characteristic curve at least the undercarriage of vehicles. On this curve, each turning element of the undercarriage assumes the shape of an identifiable pulse. The arrangement is used in the identification of moving vehicles in a predetermined plane.

Abstract: This arrangement comprises a fixed frequency emitter circuit (10) for directing a wave (12) to a surface (2) by means of a transmission antenna (11), a receiver circuit (25) for receiving by means of at least one receiving antenna (23) the wave (12) returned by the surface, and a processing circuit (30) for processing the return wave and enabling production of an indication of the velocity. The processing circuit has two branches (50 and 54), a direct branch for applying the received signal to one input of a multiplying member (52), and a delaying branch for applying the received signal to the other input of the multiplying member after having produced a delay t.sub.0 relative to the direct branch. A frequency estimating element (60) receives the multiplying member output signal and a calculation member (62) produces the indication of the velocity from the estimating member output signal and of the distance "h".