Abstract: The invention concerns the use of a material comprising at least a crosslinkable elastomer selected from the group consisting of butyl rubber, halobutyls and brominated isobutylene and para-methylstyrene copolymers, and at least a non-crosslinkable elastomer with low thermal conductivity for thermal insulation, in particular for pipes. The invention also concerns a pipe, and, in particular a submarine oil pipe for great depths, comprising at least a layer of said material.

Abstract: A decoupling sleeve for mounting in a motor vehicle exhaust pipe (LE), the sleeve (5) comprising in particular a mechanical portion (10) having two rigid end zones (15) for connection to the exhaust pipe (LE), and a sealing portion (11) that is thermally insulated from the inside by an insulation portion (12) and that extends over substantially the entire length of the mechanical portion (10) of the sleeve, the sleeve being characterized in that the sealing portion (11) comprises a central zone (22) formed by a layer or wall (24) made of a material that is flexible and that withstands temperature, and two rigid end zones (23) respectively connected to two end zones (15) of the mechanical portion (10), the sealing portion (11) forming a covering that is continuous, closed, and leakproof.

Abstract: An improved method for the selective vapor phase oxidation of propylene to acrolein in a recirculating solids reactor system using a bismuth molybdate multimetal oxide involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, and the remainder inert gas), particle size (1 to 300 micrometers), temperature (250 to 450° C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity and propylene conversion.

Abstract: The invention relates to a remote control unit (1) for a mobile telephone (2) and to a mobile telephone (2) which is controllable by a remote control unit (1).

Abstract: The operation of the apparatus (1) depends on data contained in a storage device (85). It often appears to be necessary to update these data. For this purpose, data are tapped contained in another storage device of another apparatus (50), preferably of the same type. Application to portable cellular telephony apparatus.

Abstract: An improved method for the selective vapor phase oxidation of acrolein to acrylic acid in a recirculating solids reactor system using a particulate molybdenum vanadate multimetal oxide as oxidant involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, 0 to 70 mol % water, and the remainder inert gas), solids particle size (20 to 300 micrometers), temperature (250 to 450° C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity, conversion and solids conversion ratio.

Abstract: An improved method for manufacturing acrylic acid by vapor phase oxidation of propylene in a single step or reaction stage using as solid phase oxidant a mixture of two particulate solids comprising a bismuth molybdate multimetal oxide (e.g., Mo12Co3.5Bi1.1Fe0.8W0.5Si1.4K0.05Ox) and a molybdenum vanadate multimetal oxide (e.g., Mo12V4.8Sr0.5W2.4Cu2.2Ox). Such a process is advantageously carried out in a recirculating solids reactor system wherein the particulate mixture of solids in an oxidized state reacts with a feed gas containing propylene in a vertical riser reactor and after separation from the acrylic acid gaseous product the particulate mixture of solids in a reduced state is regenerated by contact with an oxygen containing gas in a separate regeneration reactor before recirculation to the riser for further reaction.

Abstract: Solid mixed oxides composition of formula (I):

Abstract: A mixed oxide solid composition of the formulas (I): (a) Mo12Co4.7Bi1Ni2.6Fe3.7W0.5Sn0.5Si1K0.08Ox; (b) Mo12Co3.5Bi1.1Fe0.8W0.5Si1.4K0.05Ox; and (c) Mo12Co3.8Bi1.2Fe0.9W1.1Si1.5K0.05Ox, wherein x is the quantity of oxygen bonded to the other elements and depends on their oxidation states, is suitable for the manufacture of acrolein by oxidizing propylene. The solid composition reacts with propylene according to the redox reaction (1): solidoxidized+propylene→solidreduced+acrolein  (1) To manufacture acrolein, gaseous propylene is passed over the solid composition. Redox reaction (1) is conducted at a temperature of 200 to 600° C., at a pressure of 1.01×104 to 1.01 to 106 Pa (0.1 to 10 atmospheres) and with a residence time of 0.01 second to 90 seconds, in the absence of molecular oxygen.

Abstract: A mixed oxide solid composition of formula (I):Mo.sub.12 W.sub.a Bi.sub.b Fe.sub.c Co.sub.d Ni.sub.e Si.sub.f K.sub.g Sn.sub.h O.sub.x (I)where O.ltoreq.a.ltoreq.5, 0.5.ltoreq.b.ltoreq.5, 0.1.ltoreq.c.ltoreq.10, 0.5.ltoreq.d.ltoreq.10, 0.ltoreq.e.ltoreq.10, 0.ltoreq.f.ltoreq.15, 0.ltoreq.g.ltoreq.1, 0.ltoreq.h.ltoreq.2 and x is the quantity of oxygen bonded to the other elements and depends on their oxidation states, is used in the manufacture of acrolein by oxidizing propylene, the solid composition reacting with propylene according to the redox reaction (1):solid.sub.oxidized +propylene.fwdarw.solid.sub.reduced +acrolein(I)To manufacture acrolein, gaseous propylene is passed over a solid composition of formula (I), to conduct the redox reaction (1) by operating at a temperature of 200 to 600.degree. C., at a pressure of 1.01.times.10.sup.4 to 1.01 to 10.sup.6 Pa (0.1 to 10 atmospheres) and with a residence time of 0.01 second to 90 seconds, in the absence of molecular oxygen.

Abstract: Solid mixed oxides composition of formula (I):Mo.sub.12 V.sub.a Sr.sub.b W.sub.c Cu.sub.d Si.sub.e O.sub.x(I)2.ltoreq.a.ltoreq.14, 0.1.ltoreq.B.ltoreq.6, 0.ltoreq.c.ltoreq.12, 0.ltoreq.d.ltoreq.6, 0.ltoreq.e.ltoreq.15; x is the quantity of oxygen bonded to the other elements and depends on their oxidation states, are used in the manufacture of acrylic acid by oxidation of acrolein, the said solid composition reacting with acrolein according to the redox reaction (1):SOLID.sub.oxidized +ACROLEIN.fwdarw.SOLID.sub.reduced +ACRYLIC ACID(1).To manufacture acrylic acid, a gaseous mixture of acrolein and of water vapor and, if appropriate, of an inert gas is passed over a solid composition of formula (I), to conduct the redox reaction (1) by operating at a temperature of 200 to 500.degree. C., at a pressure of 1.01.times.10.sup.4 to 1.01.times.10.sup.6 Pa (0.1 to 10 atmospheres), and with a residence time of 0.01 second to 90 seconds, in the absence of molecular oxygen.

Abstract: A telephone is disclosed which includes a transducer and a controller. The transducer produces a sound having a level which varies as a function of the frequency and duty cycle of an excitation signal. The controller provides the excitation signal which has different frequencies, such as a coded melody. The controller varies the duty cycle so that the level of the sound from the transducer remains constant at the different frequencies. The telephone also includes a memory for storing values of the duty cycle corresponding to the different frequencies. These values allow the level of the sound to remain constant at the different frequencies. The controller codes the melody by storing in a table of the memory components of the melody, such as notes, silences, repetitions, the duration of each note or each silence, and a repetition number for melody components which are to be repeated. A time limit is also included in the table when the repetition number is infinite.

Abstract: A tubular section member for use as a fluid flow hose or as an admission or exhaust silencer, characterized in that it includes internal partitions or ribs (12) which are corrugated in shape in cross-section, which are interconnected by an axial core (16) along the axis of the section member, and which are wound helically along said axial core (16).

Abstract: Device for attenuating the rolling noise of vehicles, mounted on a component (3) connected to the wheel. The device includes an annular mass (5) coaxial with the wheel shaft (2) and several actuators of the automatically-controlled linear motor type (6 to 8), acting radially between the mass (5)and the component (3). The motors (6 to 8) are variable-reluctance motors. The device also includes elastic members (9) around the shaft (2) and capable of withstanding the static loads exerted between the inertial mass or masses (5) and the said component (3). The actuators and their powering alternators may be housed in the wheel rims.

Abstract: The invention relates to a vibration-filtering device and to a system for fixing a load on a support by means of a plurality of such devices.

Abstract: A resilient support device having a non-linear elastic characteristic, the device being of the type constituted by a body 1 of resilient material provided with two couplings members 6a and 6b for coupling firstly to a support 7 and secondly to a mass F to be supported, the coupling members 6a and 6b being resiliently linked together by two relatively rigid branches 8 and 9 of said body 1. The branches 8 and 9 are connected to each other by at least one resilient crosspiece 2 that is prestressed in traction and that is suitable for buckling when the force applied between said coupling members 6a and 6b reaches a predetermined value x.sub.3, the coupling deformation of the crosspiece(es) 2 being stopped by an abutment system 5 of relatively high stiffness. An application of the device is as an exhaust pipe support.

Abstract: The disclosure relates to an undulator, namely a device generating a transverse magnetic field polarized alternatively North-South and South-North along the path of an electron beam and enabling the direct conversion, in a free electron laser, of a part of the energy of a beam of relativistic electrons into light energy. The undulator comprises a conductor forming, along the path of the electron beam, undulations that wholly or partially induce the transverse magnetic field. To increase the light efficiency, it consists in providing for auxiliary current bypass connectors on said conductor. These auxiliary connectors enable the modulation of the transverse magnetic field as a function of the changing characteristics of the high frequency electrical field which increases during the arrival of a packet of electrons in the optical cavity of the laser owing to the energy yielded by these electrons.

Abstract: An elastic connecting bar for a system for active control of vibrations and which is apt to be subjected, through one of its ends, to vibrational loads exerted along its axis and which is linked by its other end to a structure which it is expedient to isolate from vibrations. The bar includes a tubular part 12 linked to one of the ends 14 of the bar and surrounding a part 15 of smaller section linked to the opposite end 16, and wherein these two parts 12, 15 are transversely linked to one another by at least two elastic bearings 10, 11 which are clasped between, them and axially spaced. The active system is used for control of vibrations acting between said parts 12, 15.

Abstract: A device for damped resilient coupling between two coaxial rotary discs, the driving disc driving the driven disc in rotation in one direction or in the other so that transmission of the drive torque may take place progressively at least within a given angular range. Each of discs (1, 2) includes for this purpose at least one rest (4, 5) for the end of a resilient torque transmission element. The resilient element is formed essentially of a composite material (3) with relatively high modulus of elasticity, and is associated with a resilient damping mass (6).

Abstract: Such a mount comprises a set of thin parallel and spaced plates, of flexible material, extending generally transversely to the vertical direction, the ends of these plates being supported on the one hand on a first armature, fastened to the structure of the vehicle, on the other hand, on a second armature fastened to the engine, through superposed blocks of elastic material, intercalated sandwich-style in said ends of the plates, these blocks embedding the ends of the plates without rigid fastening with the respective armatures. In this way, a great vertical flexibility and a high stiffness in the horizontal directions is obtained.