Abstract: A facility for detecting intrusions and suspect users in a computer installation, and a security system incorporating such a facility that makes use of surveillance data relating to the operation of the installation. The facility includes elements for modelling the computer installation, its users, and their respective behavior with the help of a semantic network; elements for comparing the modellized behavior of the system and of its users relative to modellized normal behavior; elements for interpreting observed anomalies in terms of intrusions and of intrusion hypothesis; elements for interpreting observed intrusion hypotheses and intrusions in order to indicate them and enable restraint actions to be prepared. Elements are provided to evaluate the degree of suspicion of users. The elements co-operate with one another for the purpose of providing information.

Abstract: In a method for securing the display on a screen of a workstation of mimic diagrams reflecting the status of a system connected to the workstation, a first counter is maintained in the system and a second counter is maintained in the workstation. The system periodically transmits to the workstation image data defining a mimic diagram reflecting the current status of the system, together with the first counter and a signature. In response, the workstation displays on the screen a mimic diagram based on the image data received and calculates a test value conditioned by the first and second counters, this value providing a basis for detecting a display error.

Abstract: The present invention provides a method of charging a carbon-anode lithium storage cell, which method comprises a first step in which a constant current is imposed and during which the voltage across said storage cell is allowed to increase until it reaches a reference value, and then a second step in which said reference voltage is imposed and said current decreases. The method of the invention is characterized in that, at each instant, said reference voltage is equal to the sum of the end-of-charge voltage of the cell plus the product of the current multiplied by the ohmic resistance of the cell.

Abstract: A method of preparing a substrate with a view to depositing a thin layer of a superconductive material thereon, wherein an operation is performed of depositing on the substrate an intermediate material having the property of having a crystal lattice constant that is a function of the percentage of a doping element, the depositing operation being initiated with a concentration of the doping element such that the lattice constant of the intermediate material is equal to or as close as possible to the lattice constant of the substrate, the proportion of the doping element being continuously varied during the depositing operation to a proportion of the doping element such that the lattice constant of the intermediate material is equal to or as close as possible to the lattice constant of the superconductive material.

Abstract: A method of monitoring the fabrication of a superconductive material having a high critical temperature is wherein:the starting material is a mixture of powders of precursors for said material having stoichiometric proportions appropriate for the desired superconductive phase;the said mixture is agglomerated to form a tubular or a cylindrical piece;the agglomerated piece is placed in a controlled-atmosphere oven for synthesizing said superconductive phase;the conductivity of said piece is measured continuously;the temperature at which conductivity begins to decrease is exceeded and then the temperature is returned to a value where conductivity begins to increase; andthe temperature of the oven is permanently adjusted so that said conductivity does not decrease.

Abstract: A method of making a solid magnetic material from Sm.sub.2 Fe.sub.17 N.sub.3-x type intermetallic nitride powder, where 0.ltoreq.x.ltoreq.1, comprises the following steps:a--the powder is mixed intimately with glass powder having a conversion temperature Tg between 260.degree. C. and 310.degree. C. and a softening temperature Tf less than 400.degree. C., the proportion of glass powder being between 10% and 30% of the total volume;b--the mixture is compressed to obtain a solid;c--the solid obtained is subjected in a neutral gas atmosphere to a heat cycle during which a temperature not less than Tf+5.degree. C. and not more than 420.degree. C. is maintained for at least one hour.

Abstract: A multimedia information system (1) for managing heterogeneous data having various structures and divided between dedicated data managers (2, 3, 4) in which said data is represented by an object-oriented data model comprising a first class describing properties common to all the objects manipulated by the information system characterized in that said object-oriented model further comprises a second class describing properties relative to the use of functions of the data managers and in that said first class includes a property which references at least one instance of said second class.

Abstract: A method of treating a part made of a superconductive ceramic of the (Ln).sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-.delta. type, where Ln is chosen from the rare earth elements other than cerium and terbium, the method being designed to reduce the value of .delta., in which method said part is heat treated in an oxidizing atmosphere, said method being wherein, during said treatment, an electric current with a density lying in the range 0.1 A/cm.sup.2 to 2 A/cm.sup.2 is caused to flow through said part, said treatment atmosphere having a partial pressure of oxygen lying in the range 0.1 atmospheres to 1 atmosphere, the treatment temperature lying in the range 200.degree. C. to 500.degree. C., and the duration of said treatment lying in the range 1 hour to 200 hours.

Abstract: A superconducting current limiter comprising a bar or tube of high temperature superconducting material of the composite type made up of glass and a high temperature superconducting oxide, the volume fraction of the glass lying in the range 10% to 40%, the bar or tube being selected to comply with the following inequalities:.rho.>10.sup.-4 .OMEGA..multidot.mj.sub.c >10.sup.+5 A/m.sup.2.rho.x.sup.2 <10.sup.11 W/m.sup.3in which inequalities:.rho. designates the resistivity of the material in the normal, i.e. the non-superconducting, state;j.sub.c designates the critical current density;.rho.x.sup.2 designates the power density dissipated in the bar or tube during the transition stage;it being specified that the critical current density is defined as the density which produces an electric field of 10.sup.-4 V/m along the tube or bar and that it is accepted that limitation takes place for a current density equal to five times the critical current density.

Abstract: The invention relates to a circuit for measuring the state of charge of an electrochemical cell that includes a parasitic resistance. The circuit comprises:means for subjecting the electrochemical cell to a reference voltage less than its nominal voltage, so as to cause it to deliver a discharge current;means for measuring the discharge current and providing an indication of the state of charge of the electrochemical cell; andcorrection means for correcting the reference voltage as a function of the discharge current, the correction means providing a corrected reference voltage that compensates for the parasitic resistance.

Abstract: The present invention provides a liquid cathode lithium cell including an electrolyte and a carbon-based electrode, said cell being characterized by the fact that said electrode is composed of a mixture of a carbon-containing material and of a binder to which an electroactive compound is added, said electroactive compound being more oxidizing than said electrolyte and having a reduction potential that is greater than 3 volts measured relative to a lithium electrode, the proportion of said electroactive compound lying in the range 10% to 80% by weight of said mixture.

Abstract: The present invention concerns an electrode for an electrochemical primary cell, the electrode comprising a first electron conducting compound and a second ion conducting compound which consists of a sulfur-containing polymer with a repeating unit which contains a polyether, and which can contain an ionizable salt, characterized in that the backbone of said polymer contains bonds which render it capable of reversible oxidation and reduction. Preferably, said repeating unit is a polyether of the following type, containing two sulfur-containing ternary amine terminal groups: ##STR1## where R is a polyether selected from polyethylene oxide, polypropylene oxide, and their statistical, alternating, block and graft polyether copolymers.

Abstract: A method of bonding copper to a heat conducting and electrically insulating power electronics substrate made of a non-oxide ceramic selected from AlN, SiC, and BN, the method including the steps of oxidizing the surface of the substrate and then directly bonding copper to the oxidized surface of the substrate, wherein the step of oxidizing the surface of the substrate is performed by irradiating the surface using a laser beam to a thickness in the range 0.1 .mu.m to 3 .mu.m.

Abstract: A deposition method for vapor deposition of a film of fluorine-containing glass on a substrate in which said substrate is put into contact with fluxs of the vapors of the various constituents of said glass, wherein said vapor fluxs are emitted simultaneously from at least two crucibles, a first crucible containing a host bath and main metal fluorides that constitute said fluorine-containing glass, and at least one second crucible containing dopants constituted by at least one rare earth halide.

Abstract: A super-capacitor comprising a positive electrode, a negative electrode, both made of a p-doped electron conductive polymer, and an electrolyte. The electrolyte comprises an organic redox compound soluble in the electrolyte in an amount of at least 10.sup.-3 mole per liter. The redox potential of the redox compound lies in a non-capacitive region of the electron conductive polymer. The redox compound is reduced in a reversible manner at the negative electrode when the potential of the negative electrode is equal to or less than the redox potential of the redox compound, and the redox compound is oxidized in a reversible manner at the positive electrode when the potential of the positive electrode is equal to or more than the redox potential of the redox compound.

Abstract: A method of producing a microcrystalline RBa.sub.2 Cu.sub.3 O.sub.y structure where R denotes a lanthanide chosen from Y, La, Nd, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb and Lu and where y has a value between 6.9 and 7 starts with a powder of composition [x(123) ; (1-x) (7BaO--18CuO] where (123) denotes the 123 phase of RBaB.sub.2 Cu.sub.3 O.sub.y and where the value of x is between 0.01 and 1. The powder is compressed and sintered at a temperature below 920.degree. C. (the BaCuO.sub.2 and CuO binary eutectic temperature) to form a sample. The sample is placed on an oxide of the lanthanide R. The sample and its support undergo heat treatment enabling chemical reaction between the liquid part of the sample and its support whereby substantially all of the liquid part is consumed and highly regular 123 monocrystals are obtained. Cooling is applied. At least one annealing is carried out in pure oxygen at a temperature between 350.degree. C. and 500.degree. C. to obtain the orthorhombic form characteristic of RBa.sub.2 Cu.

Abstract: The present invention provides a proton-conducting polymer solid electrolyte comprising a polyether which has two terminal primary amine functions and which is cross-linked by a curing agent having two epoxy functions, an acid being incorporated into said cross-linked polyether.

Abstract: A primary odometer velocity is measured by a sensor on an odometer member travelling over terrain. The velocity is corrected by a calculating unit to take account of the inclination of the terrain at the point of contact where the member is in contact with the terrain. The inclination is measured by means of force sensors, e.g. measuring the forces applied to said member as a whole. An inertial unit supplies the orientation and the angular velocities of the vehicle. The device has application to navigation of all-terrain robots.

Abstract: The invention provides copolymers having magnetic properties, said copolymers containing aminoaromatic groups, and being based on a structural unit comprising:a first group of aminoaromatic compounds chosen from aniline derivatives and the corresponding iminoquinone forms; anda second group of substituted aminoaromatic compounds chosen from substituted amino compounds containing at least two condensed benzene rings, substituted polycyclic compounds containing at least one aniline structural unit in their structure, compounds derived from aniline and carrying a substituent bonded to the ring by means of an ethynylidene or paraphenylene link, and the corresponding iminoquinone compounds.

Abstract: A melting-and-solidification manufacturing method for manufacturing an ingot of a high critical temperature superconductive oxide belonging, in particular, to the YBaCuO, BiSrCaCuO, or TlBaCaCuO families, wherein:an ingot of oxide having the appropriate stoichiometery is used;the ingot is held horizontally by levitation on a film of gas inside a furnace;the ingot is melted;a vertical thermal gradient is established inside said furnace such that nucleation starts at the bottom portion of said ingot;while maintaining said thermal gradient, the overall temperature of the furnace is lowered at a rate of not more than 0.1.degree. C./hour down to the temperature which corresponds to complete ingot solidification; andfinally, conventional oxygenation treatment is applied to said ingot.