Abstract: A rubber composition that comprises a highly saturated diene elastomer which is a copolymer of ethylene and of a 1,3-diene containing ethylene units which represent more than 50 mol % of the monomer units of the copolymer, a vulcanization system, a silane coupling agent and a reinforcing filler that contains a silica made hydrophobic prior to its use in the rubber composition by treatment with a blocked or non-blocked mercaptosilane, and a hydrophilic silica, is provided. Such a composition has improved curing properties whilst maintaining the compromise of property between stiffness and hysteresis.

Abstract: A patch resonator for nuclear magnetic resonance device includes a ground plane, a conductive element, a dielectric element positioned between the ground plane and the conductive element, the resonator being able to transmit a circularly polarized radiofrequency signal when the resonator is supplied by a first transmission line connected to the conductive element via a first connection point and able to receive alternatively a radiofrequency signal circularly polarized in the opposite direction when the resonator is connected to a second transmission line via a second connection point, the resonator including a switch mounted in parallel on each transmission line at a distance from the ground plane corresponding to (2n+1)?/4 with n a natural integer, and ? the wavelength of the guided wave in the transmission line at the operating frequency of the resonator, the switch making it possible to electrically connect/disconnect the transmission lines from the conductive element.

Abstract: A multiple-channel antenna includes a first loop resonator including a radiating element forming a loop; a second resonator adjacent to the first loop resonator including a radiating element; wherein the radiating element of the first loop resonator has a main surface defined along a first median plane; a secondary surface defined along a second median plane, the secondary surface delimiting an appendix of the radiating element placed facing the second resonator and having an inclination relative to the median plane of the main surface and wherein the second resonator is a linear resonator with a straight radiating element.

Abstract: A method of making a compact control module of a high frequency antenna for a magnetic resonance imaging device including M control elements and N radiating elements, N greater than M, the control module represented by a control matrix {tilde over (P)}, approximately equal to a control matrix P to control the radiating elements, the method including: decomposing the control matrix {tilde over (P)} into a product of two matrices H×L; the matrix L with dimensions M×M capable of transforming M signals Vm transmitted by M control elements into M signals Vl, in amplitude and in phase; the matrix H with dimensions N×M receiving the M signals Vl as inputs; producing the matrix FI with a number of stages less than a number of stages necessary for implementation of the matrix P; and using the matrix L starting from implementation of the matrix H determined during the producing.

Abstract: A linear resonator of a high-frequency antenna suitable for emitting a radiofrequency energisation signal and for receiving a radiofrequency relaxation signal, the linear resonator includes a radiating element to emit af radiofrequency energisation signal and receive a radiofrequency relaxation signal. The resonator also includes: a balun circuit including a power-supply line and two coupling lines; a substrate made of a dielectric material, supporting the radiating element which contains the balun circuit; two contact points connecting the balun circuit to the radiating element, the contact points being formed by one of the ends of the coupling lines extending out of the substrate, the distance separating the two contact points being selected so as to ensure the impedance matching of the resonator; and a chip floorplan separating the coupling lines from the radiating element.

Abstract: A method for creating a module for controlling a magnetic resonance imaging apparatus antenna, the method including: determining magnetic field distribution mapping B1+; constructing a matrix {tilde over (B)} from the selection of a plurality of x*m points B+1(i,j) such that {tilde over (B)}(i,j)?B+1(i,j) determining the singular vectors of the matrix {tilde over (B)} by singular value decomposition; and arranging a coupling means and/or phase-shifting means, forming said control module, such that a signal Soj outputted from the control module is a function of the equation So j = ? k = 1 n ? ? V k , j · Si k , with Sik being the input signal.

Abstract: A patch resonator for nuclear magnetic resonance device includes a ground plane, a conductive element, a dielectric element positioned between the ground plane and the conductive element, the resonator being able to transmit a circularly polarized radiofrequency signal when the resonator is supplied by a first transmission line connected to the conductive element via a first connection point and able to receive alternatively a radiofrequency signal circularly polarized in the opposite direction when the resonator is connected to a second transmission line via a second connection point, the resonator including a switch mounted in parallel on each transmission line at a distance from the ground plane corresponding to (2n+1)?/4 with n a natural integer, and ? the wavelength of the guided wave in the transmission line at the operating frequency of the resonator, the switch making it possible to electrically connect/disconnect the transmission lines from the conductive element.

Abstract: A multiple-channel antenna includes a first loop resonator including a radiating element forming a loop; a second resonator adjacent to the first loop resonator including a radiating element; wherein the radiating element of the first loop resonator has a main surface defined along a first median plane; a secondary surface defined along a second median plane, the secondary surface delimiting an appendix of the radiating element placed facing the second resonator and having an inclination relative to the median plane of the main surface and wherein the second resonator is a linear resonator with a straight radiating element.

Abstract: A method of making a compact control module of a high frequency antenna for a magnetic resonance imaging device including M control elements and N radiating elements, N greater than M, the control module represented by a control matrix {tilde over (P)}, approximately equal to a control matrix P to control the radiating elements, the method including: decomposing the control matrix {tilde over (P)} into a product of two matrices H×L; the matrix L with dimensions M×M capable of transforming M signals Vm transmitted by M control elements into M signals V1, in amplitude and in phase; the matrix H with dimensions N×M receiving the M signals V1 as inputs; producing the matrix H with a number of stages less than a number of stages necessary for implementation of the matrix P; and using the matrix L starting from implementation of the matrix H determined during the producing,

Abstract: A linear resonator of a high-frequency antenna suitable for emitting a radiofrequency energisation signal and for receiving a radiofrequency relaxation signal, the linear resonator includes a radiating element to emit a radiofrequency energisation signal and receive a radiofrequency relaxation signal. The resonator also includes: a balun circuit including a power-supply line and two coupling lines; a substrate made of a dielectric material, supporting the radiating element which contains the balun circuit; two contact points connecting the balun circuit to the radiating element, the contact points being formed by one of the ends of the coupling lines extending out of the substrate, the distance separating the two contact points being selected so as to ensure the impedance matching of the resonator; and a chip floorplan separating the coupling lines from the radiating element.

Abstract: A method for creating a module for controlling a magnetic resonance imaging apparatus antenna, the method including: determining magnetic field distribution mapping B1+; constructing a matrix {tilde over (B)} from the selection of a plurality of x*m points B+1(i,j) such that {tilde over (B)}(i,j)?B+1(i,j) determining the singular vectors of the matrix {tilde over (B)} by singular value decomposition; and arranging a coupling means and/or phase-shifting means, forming said control module, such that a signal Soj outputted from the control module is a function of the equation So j = ? k = 1 n ? ? V k , j · Si k , with Sik being the input signal.