Abstract: A method for exchanging information about an event located in a zone, including a step of opening a two-way communication channel, triggered by a user located in the zone; a step of an electronic device acquiring zone data including images of the event and location data of the electronic device; a step of transmitting zone data to a server; a step of the server analysing the zone data; a step of the server generating user information on the basis of the analysis; a step of feeding back information, wherein the server transmits the user information to the electronic device, in order to send the user information to the user.

Abstract: An access control installation includes a structure, a moving walkway that extends between two walls of the structure from an entrance to an exit of the installation, a document reader mounted on the structure in the vicinity of the entrance of the installation, a biometric sensor device mounted on the structure at a predetermined distance from the exit of the installation, and an electronic processor unit connected to the document reader and to the biometric sensor device and arranged to compare reference biometric data contained in the document with biometric characteristics supplied by the sensor device in order to verify that they match, the predetermined distance being sufficient, given the speed at which the walkway moves, to allow the electronic processor device to perform the verification operation before the user concerned reaches the exit of the installation.

Abstract: A method for authenticating at least one document having a predetermined format and carrying at least one security pattern of appearance that varies as a function of an angle of observation, the method comprising the steps of: capturing at least one image of the document; determining a camera angle by comparing geometric characteristics detected in the document and stored predetermined geometric characteristics; deducing an expected appearance for the security pattern; comparing the expected appearance with an appearance detected in the image of the document; and declaring the document authentic when the expected appearance matches the detected appearance.

Abstract: The invention proposes a method for controls on persons in possession of a document comprising a machine-readable zone containing a document number and an electronic chip in which an authentication biometric is stored, comprising: at a first step (100), acquiring (120) a biometric datum, acquiring (110) the document number by reading the machine-readable zone, and recording (130), in a memory (20), the number linked with the biometric datum, and at a second step (200), acquiring (210) a biometric, from said biometric datum retrieving (220), in the memory, the number of the identity document corresponding to the person, accessing the content of the chip and retrieving the authentication biometric datum (240), and performing authentication (250) of the person by comparing the authentication biometric datum with a biometric datum of the person.

Abstract: The invention relates to a method for controlling access to or exit from a controlled area, implemented in a system comprising at least one database comprising: a first data set, comprising biometric data of persons linked with identifiers of means of transport or travel; and a second data set including at least one piece of data such as marital status and/or identity document and at least one piece of personal biometric data, the method being characterized by implementing steps that comprise: for each vehicle, acquiring an identifier of the means of transport or travel, and biometric data of at least one passenger in the vehicle; for each passenger for which biometric data has been acquired, determining whether said passenger is recorded in the first data set linked with the vehicle; if a passenger is not recorded in the first data set linked with the vehicle, verifying that the passenger is recorded in said set linked with another vehicle or, failing that, that said passenger is recorded in the second data

Abstract: A method for authenticating at least one document having a predetermined format and carrying at least one security pattern of appearance that varies as a function of an angle of observation, the method comprising the steps of: capturing at least one image of the document; determining a camera angle by comparing geometric characteristics detected in the document and stored predetermined geometric characteristics; deducing an expected appearance for the security pattern; comparing the expected appearance with an appearance detected in the image of the document; and declaring the document authentic when the expected appearance matches the detected appearance.

Abstract: The invention proposes a method for controls on persons in possession of a document comprising a machine-readable zone containing a document number and an electronic chip in which an authentication biometric is stored, comprising: at a first step (100), acquiring (120) a biometric datum, acquiring (110) the document number by reading the machine-readable zone, and recording (130), in a memory (20), the number linked with the biometric datum, and at a second step (200), acquiring (210) a biometric, from said biometric datum retrieving (220), in the memory, the number of the identity document corresponding to the person, accessing the content of the chip and retrieving the authentication biometric datum (240), and performing authentication (250) of the person by comparing the authentication biometric datum with a biometric datum of the person.

Abstract: The invention relates to a method for controlling access to or exit from a controlled area, implemented in a system comprising at least one database comprising: a first data set, comprising biometric data of persons linked with identifiers of means of transport or travel; and a second data set including at least one piece of data such as marital status and/or identity document and at least one piece of personal biometric data, the method being characterised by implementing steps that comprise: for each vehicle, acquiring an identifier of the means of transport or travel, and biometric data of at least one passenger in the vehicle; for each passenger for which biometric data has been acquired, determining whether said passenger is recorded in the first data set linked with the vehicle; if a passenger is not recorded in the first data set linked with the vehicle, verifying that the passenger is recorded in said set linked with another vehicle or, failing that, that said passenger is recorded in the second data

Abstract: A detection gate for detecting substances carried by an individual or an object, has two lateral uprights facing one another and defining a passage there between for the individual or the object, a blowing device installed in a blowing chamber in one of the uprights which are adapted to exhaust the air contained in the blowing chamber towards the other upright, an exhaust device installed in an exhaust chamber in the other upright, which are suitable for exhausting the air thus blown, a detection device arranged upstream from the passage and adapted to detect the presence of the substances in the air thus blown, and a transfer line which, via one of the ends thereof, leads into the blowing chamber and, via the other end thereof, into the exhaust chamber, the blowing device and the exhaust device being such that a single volume of air has time to pass through the passage at least twice during the time that individual or the object is present in the passage.

Abstract: A detection gate for detecting substances carried by an individual or an object, has two lateral uprights facing one another and defining a passage there between for the individual or the object, a blowing device installed in a blowing chamber in one of the uprights which are adapted to exhaust the air contained in the blowing chamber towards the other upright, an exhaust device installed in an exhaust chamber in the other upright, which are suitable for exhausting the air thus blown, a detection device arranged upstream from the passage and adapted to detect the presence of the substances in the air thus blown, and a transfer line which, via one of the ends thereof, leads into the blowing chamber and, via the other end thereof, into the exhaust chamber, the blowing device and the exhaust device being such that a single volume of air has time to pass through the passage at least twice during the time that individual or the object is present in the passage.

Abstract: The invention relates to a composition based on zirconium oxide and comprising cerium oxide which has a specific surface of at least 30 m2/g after calcination for 6 hours at 900° C. and which is provided in the form of a pure solid solution of cerium oxide in zirconium oxide. According to another embodiment, this composition can additionally comprise a doping element and can exhibit a specific surface of at least 25 m2g after calcination for 6 hours at 1000° C. A process for the preparation of these compositions comprises the following stages: a mixture is prepared, in liquid medium, containing a zirconium compound and a cerium(IV) compound; the said mixture is heated at a temperature greater than 100° C.

Abstract: Storage-stable colloidal organic sols comprise suspended tetravalent metal oxide particulates in an organic diluent medium, notably cerium dioxide particulates, the tetravalent metal oxide particulates having a particle size d90 no greater than 200 nanometers and being complexed with at least one amphiphilic organic acid, and either said tetravalent metal oxide particulates comprising agglomerates of crystallites, the d80 of which being no greater than 5 nanometers and at least 90% of said agglomerates comprising from 1 to 5 crystallites, and/or said at least one amphiphilic organic acid has from 11 to 50 carbon atoms and is branched in at least one of the &agr;-, &bgr;-, &ggr;- or &dgr;-positions relative to the atom bearing the acidic hydrogen.

Abstract: A method for processing soot containing one or more rare earths, wherein said soot is contacted with an oxygen-containing gas, is disclosed. The method comprises (a) preparing an aqueous phase comprising a dispersion of at least one oxygenated metal compound; (b) simultaneously or consecutively contacting a suspension from step (a) with an organic phase including at least one amphiphilic agent and preferably an organic mixture or compound as the solvent; and c recovering the organic phase. Said oxygenated metal compound is produced by means of a method according to which a solution including at least one soluble rare-earth salt, usually an acetate and/or a chloride, is prepared; the solution is contacted with a basic medium and the resulting reaction mixture is maintained at a basic pH; and the precipitate formed by atomization or freeze-drying is recovered. Said method is useful in inorganic synthesis and catalysis.

Abstract: Vehicular emissions are reduced/purified via combustion of the hydrocarbon fuel therefor, e.g., diesel fuel, in the presence of a cerium compound, preferably a cerium (IV) compound, to produce soots having depressed ignition temperatures that contain effective purifying amounts of aggregates of ceric oxide crystallites, the largest particle size dimension of which ranging from 50 .ANG. (5 nanometers) to 10,000 .ANG. (1,000 nanometers) and the crystallite sizes of which, measured by Debye-Scherrer technique, ranging from 50 .ANG. (5 nanometers) to 250 .ANG. (25 nanometers).

Abstract: Colloidal dispersions of finely divided particulates, well suited for the production of catalysts for the catalytic conversion of exhaust gases emanating from internal combustion engines, notably vehicular exhaust gases, comprise at least one rare earth compound and, optionally, at least one compound of at least one other element selected from among those of groups IVa, VIIa, VIII, Ib, IIb, IIIb and IVb of the Periodic Table, said particulates being at least 50% dispersible in water.

Abstract: The invention provides a catalytic composition which is based on a cerium oxide and on at least one other oxide chosen from iron, manganese and praseodymium oxides, which controls H.sub.2 S emissions in the catalysis of treatment of automobile exhaust gas.

Abstract: The invention relates to new compositions based on ceric oxide having an improved oxygen storage capacity, these compositions being characterized in that they contain, besides ceric oxide, at least one oxide of another metallic element M chosen from the group consisting of iron, bismuth, nickel, tin and chromium or one of their mixtures, this oxide preferably being in solid solution with the abovementioned cerium oxide. The process of synthesis of these compositions consists in first of all preparing an intimate mixture between (i) a ceric oxide or a ceric hydroxide and (ii) at least one additive consisting of a hydroxide or a salt, thermally decomposable to an oxide, of the metallic element M, and in then calcining this mixture so as to obtain the desired composition based on oxides. The compositions according to the invention are particularly useful in the manufacture of catalysts and/or catalyst supports, especially those intended for treating exhaust gases from internal combustion engines.

Abstract: The invention concerns a procedure for preparation of a precursor of a mixed cerium and zirconium oxide-based composition, characterized by the following steps:a liquid mixture is prepared containing cerium and zirconium compounds;the preceding mixture is placed in contact with carbonate or bicarbonate, thus forming a reactive medium exhibiting a neutral or basic pH during the reaction;the precipitate obtained is collected.A mixed cerium and zirconium oxide-based composition is obtained by calcining this precursor. This composition is characterized by the fact that it has a total pore volume of at least 0.6 cm.sup.3 /g, and that at least 40%, and more particularly at least 50%, of the total pore volume is composed of pores having a diameter of at most 1 .mu.m.

Abstract: Thermally stable/highly reducible catalyst compositions, well suited for the catalytic conversion of exhaust gases emanating from internal combustion engines notably vehicular exhaust gases, comprise alumina, the oxides of cerium praseodymium and zirconium, and, optionally, at least one other oxide of bismuth, of a rare earth, or of an element of group VIII of the Periodic Table, and exhibit a stabilized hydrogen-absorption capacity up to a temperature of at least 1,000.degree. C.

Abstract: Cerium/zirconium mixed oxides (optionally including yttrium values), comprising solid solutions thereof, having contents of zirconium of up to 60 atom % and having thermally stable, very high specific surface areas at least greater than 80 m.sup.2 /g, preferably at least 100 m.sup.2 /g and more preferably at least 150 m.sup.2 /g, are well suited as catalysts and/or catalyst supports, notably for the treatment/conversion of vehicular exhaust gases; such Ce.sub.x Zr.sub.1-x O.sub.2 particulates are conveniently prepared by thermally treating an aqueous solution of soluble compounds of cerium and zirconium (and optionally yttrium), e.g. the nitrates thereof, present in the desired stoichiometric amounts, and thence recovering and, if appropriate, calcining the reaction product thus formed.