Abstract:
The present invention concerns a method for preparing glycerol ether or glycol ether comprising the reaction of a compound of formula (II) with a compound of formula (III) in the presence of a heterogeneous acid catalyst of formulas (II) and (III).
Abstract:
The present invention relates to the use of a compound of formula (I): wherein: —R represents —OH or —NH2; —A1 represents a divalent alkylene radical, straight or branched, having from 2 to 20 carbon atoms; —A2 represents a divalent alkylene radical, straight or branched, having from 1 to 20 carbon atoms; —X1 and X2 represent, independently of each other, —NH— or −O—; —A3 represents a divalent alkylene radical, straight or branched, having from 1 to 10 carbon atoms; —Z represents a hydrogen or a group of formula (A′): wherein A1, A3 and R are as defined above in formula (I), for the preparation of a polymer chosen among polyurethane, polyester and polyamide.
Abstract:
The invention relates to an acoustic volume wave resonator configured to resonate at a predetermined work frequency comprising: a mounting (12), comprising a first surface (14) and a second surface (16), a resonating substrate (18), comprising a first surface (20) and a second surface (22), and a diaphragm (24) rigidly connecting the second surface (16) of the mounting on the one hand and the first surface (20) of the resonating substrate on the other hand, The mounting comprises an internal cavity (28) and an internal electrode (32), so as to form a gap area (34) between the internal electrode (24) and a portion (35) of the diaphragm.The resonating substrate is configured to generate, between its first surface and its second surface, longitudinal mode acoustic waves vibrating at the work frequency of the resonator, when an electrostatic field having a sinusoidal component at the work frequency is generated in the gap area by applying a differential voltage between the diaphragm or the first surface of the resonating substrate on the one hand and the internal electrode on the other hand.
Abstract:
This method of calibration comprising the reconstruction of a 3D mapping of 3D landmarks of an environment on the basis of digital images of the environment captured by the computer-based vision system (10) during the movement of the craft (2) along a trajectory. It comprises the optimization of at least one 3D mapping corresponding to a first sequence of images by considering at least one extrinsic parameter and/or at least one intrinsic parameter and/or at least one parameter of poses and/or one parameter of 3D landmarks as constant and the optimization of at least one 3D mapping corresponding to a second sequence of images, longer than the first image sequence and including the first image sequence, by considering said at least one extrinsic parameter and/or said at least one intrinsic parameter and/or said at least one parameter of poses and/or said at least one parameter of 3D landmarks as variable so as to estimate it.
Abstract:
A bulk wave piezoelectric resonator operating at a predetermined frequency includes a substrate block, having a plane face, a first thickness and consisting of a first material, a resonant plate having a length, width and second thickness, and consisting of a second piezoelectric material, first and second metal electrodes at least partly covering the resonant plate on each side and partly facing each other. The resonant plate is fixed perpendicularly in the vicinity of the plane face of the substrate block so that the width of the resonant plate and the first thickness of the substrate block have the same direction, and the first material, the second material, the first thickness of the block of substrate, the length, the width, the second thickness of the resonant plate are configured for trapping bulk waves at the operating frequency of the resonator and for producing a plane-plane type bulk wave piezoelectric resonator.
Abstract:
Novel amino acids derivatives, in particular some amino acid amides derivatives, their process of preparation and their use for inhibiting Met-triggered disorders, in particular cancer.
Abstract:
A method of controlling a machine with redundant parallel actuation includes a frame and a mobile element driven by a plurality of mechanical transmissions parallel to one another and each being activated by an actuator (2) including a body fixed to the frame, an actuating member and a position sensor, in which an error signal is produced by comparing the position of each actuator with a setpoint signal, characterized in that the error signals are converted into a mobile element position error signal by applying data representative of the kinematics of the mechanical transmissions, the mobile element error signal is processed by a processing module which produces an effort signal to be applied to the mobile element, the effort signal is converted into signals controlling the actuators by applying data representative of the kinematics of the mechanical transmissions.
Abstract:
A method for hard surface deposition on aluminium metal parts of a turbine engine using MIG welding equipment which includes a pulsed current generator and pulsed filler metal wire feed, wherein the deposition is achieved using a filler metal wire whose composition is of the same nature as the composition of the aluminium alloy of the part to undergo hard surface deposition, with the pulsed metal wire feed and speed of deposition on the metal part of the turbine engine being adapted to carry out deposition without hot fissuring.
Abstract:
This invention describes a process for the production of middle distillates comprising at least one hydrocracking stage that oligomerizes a paraffinic feedstock produced by Fischer-Tropsch synthesis, said process using a catalyst that comprises at least one hydrogenating-dehydrogenating metal that is selected from the group that is formed by the metals of group VIB and group VIII of the periodic table, by themselves or in a mixture, and a substrate that comprises a beta zeolite in the form of crystallites with a mean size that is less than 100 nm dispersed in at least one porous mineral matrix, whereby said beta zeolite has a mesopore volume of less than 0.4 ml/g.
Abstract:
Compounds of formula VII are described: 1 wherein A represents phenyl or naphthyl and Ar1 and Ar2 independently represent a saturated or aromatic carbocyclic group. The compounds may be prepared by reducing the nitrile functions of a compound of formula I: 2