Abstract: A method for counter-current liquid-liquid extraction in a sub-millimeter conduit is implemented from an initial liquid drop stream. The stream has alternating drops of a first liquid, and a second liquid less wetting than the first liquid and immiscible with the first liquid. One of the liquids includes a component to extract towards the other liquid. A first pressure gradient applied along the conduit generates a visco-inertial flow displacing a first drop stream volume according to the first gradient and generating a film of first liquid displaced along the opposite orientation, the film being located between the drops of second liquid and the conduit. The application of the first pressure gradient is stopped. A second pressure gradient is applied along the conduit, in the opposite orientation to generate a viscous-capillary flow displacing a second volume of according to the second gradient and application of the second pressure gradient stops.

Abstract: An optical waveguide including a first substrate incorporating a first optical guiding structure exposed at a surface of the first substrate, a second substrate incorporating a second optical guiding structure exposed at a surface of the second substrate, the two substrates being assembled superimposed by their surfaces such that the two optical guiding structures are facing each other and extend in a same direction. A channel is fitted between the first and the second guiding structure, directed along the direction, the channel having a cross-section with a large dimension substantially parallel to the surface of the first substrate and to the surface of the second substrate, enabling light to interact on a given distance with the fluid. Such a waveguide can, for example, find application to fluid analysis.

Abstract: An optical waveguide including a first substrate incorporating a first optical guiding structure exposed at a surface of the first substrate, a second substrate incorporating a second optical guiding structure exposed at a surface of the second substrate, the two substrates being assembled superimposed by their surfaces such that the two optical guiding structures are facing each other and extend in a same direction. A channel is fitted between the first and the second guiding structure, directed along the direction, the channel having a cross-section with a large dimension substantially parallel to the surface of the first substrate and to the surface of the second substrate, enabling light to interact on a given distance with the fluid. Such a waveguide can, for example, find application to fluid analysis.

Abstract: A method inhibits the formation of zirconium molybdate precipitate in an aqueous solution containing the element molybdenum and the element zirconium by adding a chemical element selected from plutonium, tellurium, antimony and mixtures thereof with the aqueous solution. The method can be used for reprocessing used fuels with the element molybdenum and the element zirconium.

Abstract: A method inhibits the formation of zirconium molybdate precipitate in an aqueous solution containing the element molybdenum and the element zirconium by adding a chemical element selected from plutonium, tellurium, antimony and mixtures thereof with the aqueous solution. The method can be used for reprocessing used fuels with the element molybdenum and the element zirconium.

Abstract: The method of dissolving the solids formed in the apparatus and pipework of a nuclear plant, in which the solids are brought into contact with an aqueous dissolving solution chosen from aqueous solutions of carbonate ions having a concentration of greater than or equal to 0.3M, aqueous solutions of bicarbonate ions, and solutions of a mixture of nitric acid and of a polycarboxylic acid chosen from oxalic acid and triacids.

Abstract: The method of dissolving the solids formed in the apparatus and pipework of a nuclear plant, in which the solids are brought into contact with an aqueous dissolving solution chosen from aqueous solutions of carbonate ions having a concentration of greater than or equal to 0.3M, aqueous solutions of bicarbonate ions, and solutions of a mixture of nitric acid and of a polycarboxylic acid chosen from oxalic acid and triacids.

Abstract: The present invention relates to a method for analyzing a liquid sample by injection of the latter into a reaction loop coupled with illumination means and detection means, which comprises the following steps: filling a reaction loop (42) with a minimum volume of the sample to be analyzed, this reaction loop forming a transparent pipe with which detection means are coupled, injecting a fixed volume of at least one reagent into the reaction loop (42), detecting levels of filtered light by these detection means (41), discharging reagents located in the reaction loop (42). The present invention also relates to a system for analyzing a liquid sample.

Abstract: Method of dissolving the solids formed in the apparatus and pipework of a nuclear plant, in which said solids are brought into contact with an aqueous dissolving solution chosen from aqueous solutions of carbonate ions having a concentration of greater than or equal to 0.3M, aqueous solutions of bicarbonate ions, and solutions of a mixture of nitric acid and of a polycarboxylic acid chosen from oxalic acid and triacids.