Abstract: Disclosed is an acoustic transducer for converting a sound signal into an electric signal, including a mobile element movable under the effect of the sound signal, a fixed element opposite the mobile element, a recess, and a dissipative element between the mobile and fixed elements. The coupled system has a natural frequency corresponding to a resonance frequency of the transducer set at maximum sensitivity. The mobile element, the fixed element, the dissipative element and the recess are configured so the quality factor of the acoustic transducer>2. The recess has a straight prismatic, cylindrical, or frustoconical shape, the mobile element forming a first base of the prism, cylinder, or frustum, the fixed element being inside the prism, cylinder or frustum, over the second base of the prism, cylinder or frustum. Such a transducer also incorporates an analogue filtering function for filtering the signal around the natural frequency of same.

Abstract: A method for reproducing an acoustic signal from a digital signal, the digital signal being formed of successive bit sequences each having bits representative of the amplitude of an acoustic signal at a time sample, the method including (i) providing a plurality of transducers configured to emit acoustic signals that are wave trains having each a duration lower or equal to the duration of one time sample and including at least one oscillation per time sample, and (ii) successively, for each bit sequence, having each bit associated to at least one of the transducers and independently govern, depending on its value, amplitudes of the acoustic signals emitted by its associated transducers.

Abstract: A contrast-amplifying support for the observation of a sample, comprises a transparent substrate carrying at least one absorbing layer whose complex refractive index N1=n1?jk1 and thickness are chosen in such a way that the layer behaves in the guise of antireflection layer when it is illuminated under normal incidence at an illumination wavelength ? through the substrate, the face of the layer opposite to the d substrate being in contact with a transparent so-called ambient medium whose refractive index n3 is less than that of the refractive index n0 of the substrate. Methods for producing a contrast-amplifying support and for observing a sample, or for detecting or assaying at least one chemical or biological species, using such a contrast-amplifying support are provided.

Abstract: A method for producing a contrast-amplifying support comprising an absorbing substrate carrying at least one absorbing layer comprises a design step for the support and the following steps: i) choosing an illumination wavelength ?; ii) choosing a material constituting the substrate and exhibiting, at illumination wavelength ?, a complex refractive index N0=n0?jk0 with k0?0.01; iii) choosing an ambient medium in contact with the layer on the side opposite to the substrate and exhibiting, at illumination wavelength ?, a complex refractive index N3=n3?jk3 with k3?0; iv) determining a nominal complex refractive index N1=n1?jk1 and a nominal thickness e1 of the layer wherein it behaves in the guize of antireflection layer when illuminated under normal incidence at illumination wavelength ?; and v) choosing a material constituting the layer and exhibiting, at illumination wavelength ?, a complex refractive index whose real and imaginary parts coincide with the nominal complex refractive index.

Abstract: The invention relates to a method for observing a sample under optical microscopy, in incoherent, unpolarised light, using a sample substrate including a contrast-amplifying layer having a complex index of refraction. The invention also relates to a method for detecting or metering at least one chemical or biological species using such a sample substrate.

Abstract: An electrochemical device comprises a fluidic cell having an internal volume able to be filled with a fluid and at least one first and one second electrode making contact with the internal volume, wherein at least the first electrode comprises a thin layer made of a conductive material that is optically absorbent at at least one wavelength ? in the visible, near-infrared or near-ultraviolet spectrum, the thin layer being arranged on or in an internal surface of a wall of the fluidic cell which is at least partially transparent to said wavelength ?. An electrochemical apparatus comprises such an electrochemical device and an optical microscope arranged to illuminate the first electrode through the wall at at least said wavelength ? and also to observe it through the wall.

Abstract: A system for recording a digital hologram of an object comprises: a coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and a digital sensor intended to record the digital hologram of the object. It furthermore comprises a spatial phase modulating assembly able to produce in the plane of the sensor a plurality of duplicates of the wave diffracted by the object, the duplicates being offset from each other but overlapping partially, these duplicates forming on the sensor a digital hologram of the object, this hologram being what is referred to as a self-reference hologram.

Abstract: The invention relates to a conductive material comprising a first phase including a thermoset compound, a second phase, consisting of a smaller volume, including a thermoplastic compound, and a conductive compound, wherein the second phase is dispersed in the first phase, the two phases are bicontinuous, and the conductive compound is situated at the interface between the first and second phases.

Abstract: A method for reproducing an acoustic signal from a digital signal, the digital signal being formed of successive bit sequences each having bits representative of the amplitude of an acoustic signal at a time sample, the method including (i) providing a plurality of transducers configured to emit acoustic signals that are wave trains having each a duration lower or equal to the duration of one time sample and including at least one oscillation per time sample, and (ii) successively, for each bit sequence, having each bit associated to at least one of the transducers and independently govern, depending on its value, amplitudes of the acoustic signals emitted by its associated transducers.

Abstract: This invention relates to a method for producing functionalized telechelic oligomers, comprising two steps. The first step relates to bringing a raw material comprising at least one high-molecular-weight polymer comprising at least two unsaturations, into contact with a solution comprising at least one metathesis catalyst and at least one functionalizing agent. The second step relates to the separation of the functionalized telechelic oligomers produced by the metathesis reaction in ionic liquid medium of the first step.

Abstract: An acoustically absorbent cell for an acoustic panel, comprising a layer with a porous matrix incorporating a plurality of acoustic resonators between a first face and a second face of the porous matrix is described. The resonators are ordered so as to form at least two substantially parallel rows each comprising at least two resonators and extending along the first and second faces.

Abstract: An ionic liquid supported organotin reagent of formula (I) A process for manufacturing the ionic liquid supported organotin reagent of formula (I), a process for manufacturing an halogenated or radio-halogenated compound using compound of formula (I), a device for implementing the halogenating process and a kit including the compound of formula (I) are also described.

Abstract: This invention relates to a method for producing functionalised telechelic oligomers, comprising two steps. The first step relates to bringing a raw material comprising at least one high-molecular-weight polymer comprising at least two unsaturations, into contact with a solution comprising at least one metathesis catalyst and at least one functionalising agent. The second step relates to the separation of the functionalised telechelic oligomers produced by the metathesis reaction in ionic liquid medium of the first step.

Abstract: The invention relates to an acoustically absorbent cell (22, 48) for an acoustic panel, comprising a layer (32) with a porous matrix incorporating a plurality of acoustic resonators (A1-A4, B1-B6) between a first face (30, 54) and a second face (28, 56) of the porous matrix (32). According to the invention, the resonators (A1-A4, B1-B6) are for example ordered so as to form at least two substantially parallel rows (24, 26, 50, 52) each comprising at least two resonators and extending along the first and second faces.

Abstract: The invention relates to a device for measuring a heat flux, comprising a thermopile formed of a plurality of thermojunctions of distributed type. The device is formed of a first and a second ceramic substrate (Ce1, Ce2), a first face of the first substrate (Ce1) is composed of cavities which are separated by ceramic spacers (Ca1, Ca2, Ca3, Ca4), the thermopile is placed on a second planar face of the first substrate which is located opposite the first face, the spacers of the first substrate are arranged beneath one thermojunction (Tj2, Tj4, Tj6, Tj8) in two of the thermopile, a face of the second substrate (Ce2) is composed of cavities which are separated by ceramic spacers (Ca5, Ca6, Ca7, Ca8, Ca9), the spacers of the second substrate rest on a thermojunction (Tj1, Tj3, Tj5, Tj7, Tj9) beneath which a spacer of the first substrate is not arranged.

Abstract: The present invention relates to the field of electrodynamic speakers. Particularly, the present invention relates to an electrodynamic speaker structure having MEMS technology. More particularly, the invention relates to such a structure comprising stator-forming means, diaphragm-forming means, and resiliently shape-changing means for connecting such means.

Abstract: The invention relates to a conductive material comprising a first phase including a thermoset compound, a second phase, consisting of a smaller volume, including a thermoplastic compound, and a conductive compound, wherein the second phase is dispersed in the first phase, the two phases are bicontinuous, and the conductive compound is situated at the interface between the first and second phases.

Abstract: Photo-crosslinkable antifouling compositions, in particular antibacterial, antifungal and anti-algae ones, which include the combination of at least one telechelic oligoisoprene of a particular formula with an agent for crosslinking the oligoisoprene. The antifouling film is obtained by applying a thin layer of such a liquid composition on a substrate and is crosslinked at room temperature by exposure to visible and/or UV radiations. The film can be used for preventing the occurrence of a biofilm on any surface in a humid or aqueous environment, and can be used as an additive for preparing materials with a view to imparting bacteriostatic and/or bactericidal properties thereto.

Abstract: Novel compounds, having an azlactone function, of formula (I), to be used as multifunctional coupling agents, and a method for coupling a biomolecule and a target molecule using such a compound are described. A diagnosis reagent, a kit for implementing the coupling method, a method for separating, detecting and/or characterizing at least one molecule of interest, and a composition including a novel compound are also described.

Abstract: The invention relates to processes for the modification of surfaces and on processes for the measurement of adhesion forces and of different forces of interaction (friction forces, adhesion forces) by scanning probe microscopy functioning in continuous <<curvilinear>> mode, as well as to a scanning probe microscope and a device permitting the implementation of said processes.