Abstract: The invention concerns the combined use, in an elastomer composition preferably comprising an isoprene elastomer, a precipitated silica containing titanium and a specific conjugated diene compound, such as a conjugated diene phosphonate or phosphinate compound. It also concerns the elastomer compositions obtained and the items produced from said compositions.

Abstract: An improved method of starting a switched reluctance motor uses two neighbouring pairs of coils, both energised, to bring the rotor to its initial position. Then one of pairs of coils is turned off and the rotor is attracted by the other pair of coils to give it an initial rotational speed. An intermediate stage uses just one pair of coils of the motor to bring it up to operational speeds, after which the normal cycling of all the coils can be used.

Abstract: A switched reluctance motor is controlled by sensing the position of the rotor of the motor to provide indications of the timings of one or more positions of the rotor per revolution of the rotor, deriving from those indications, indications of the timings of one or more estimated positions of the rotor between the timings indicated by the sensing, and then energising the stator coils of the motor at those times.

Abstract: A magnetic indicator ring has a set of boundaries between magnetic domains. Some or all of these are to be identified. A reference set of measurements of the angular widths between the boundaries to be identified are measured and recorded. Later a second set of measurements of the widths between those boundaries are made and these widths are matched against the reference set. Matching up widths identifies which of the boundaries are which from the reference set. This enables other data recorded respective to those boundaries to be used. For example the other date may be offsets between the boundaries and the position of a rotor in a switched reluctance motor used to drive the compressor wheel in a supercharger.

Abstract: An improved method of starting a switched reluctance motor uses two neighbouring pairs of coils, both energised, to bring the rotor to its initial position. Then one of pairs of coils is turned off and the rotor is attracted by the other pair of coils to give it an initial rotational speed. An intermediate stage uses just one pair of coils of the motor to bring it up to operational speeds, after which the normal cycling of all the coils can be used.

Abstract: A method for preparing precipitated silicas is described. A precipitation reaction between a silicate and an acidifying agent is also described, wherein a precipitated silica suspension is produced, and, subsequently, separation and drying of the suspension is conducted, in which, inter alia, one of the following three operations (a, b or c) is performed: (a) simultaneously adding a compound of aluminium and a basic agent, (b) simultaneously adding a silicate and a compound of aluminium, (c) simultaneously adding the acidifying agent, a silicate and a compound of aluminium.

Abstract: The invention concerns the combined use, in an elastomer composition preferably comprising an isoprene elastomer, a precipitated silica containing titanium and a specific conjugated diene compound, such as a conjugated diene phosphonate or phosphinate compound. It also concerns the elastomer compositions obtained and the items produced from said compositions.

Abstract: The invention relates to an electromagnetic actuator comprising a housing (9) having several faces (20, 21) and an electronic control circuit (14) split into at least two parts (14a, 14b) distributed over at least two adjacent faces (20, 21) of the housing (9), each part (14a) of the circuit comprising at least one metallic connector (25a) arranged so as to be connected electrically and mechanically with a metallic connector (25b) of another part of the circuit (14b) so as to form an electrical connection (24).

Abstract: The invention relates to a printed circuit board (1) with an insulated metal substrate, comprising a metal carrier (2), an insulating layer (4) and a metal layer (3) on which at least one electronic component (5) is mounted in at least one mounting zone (3A) of the metal layer (3), characterized in that each mounting zone (3A) is a raised zone of the metal layer (3).

Abstract: The invention relates to an electromagnetic actuator comprising a housing (9) having several faces (20, 21) and an electronic control circuit (14) split into at least two parts (14a, 14b) distributed over at least two adjacent faces (20, 21) of the housing (9), each part (14a) of the circuit comprising at least one metallic connector (25a) arranged so as to be connected electrically and mechanically with a metallic connector (25b) of another part of the circuit (14b) so as to form an electrical connection (24).

Abstract: The present invention relates to a circuit for measuring an effective current (ieff(t)) of a signal to be monitored (i(t)), where the circuit includes means for making a continuous reference signal (iDC(t)) depend on the signal to be monitored (i(t)) so that the effective current (iDCeff(t)) of the continuous reference signal (iDC(t)) is equal to the effective current (ieff(t)) of the signal to be monitored (i(t)).

Abstract: The present invention relates to a circuit (300) for controlling the current in an electrical control member (110) comprising a bridge provided with four terminals (105, 106, 107, 108) and comprising four control switches (AH, AL, BH, BL), a power source (109), PWM control means for at least two of the four switches. The control circuit exhibits a first state in which said first (AH) and fourth (BL) switches are closed and said second (BH) and third (AL) switches are open, a second state in which said second (BH) and third (AL) switches are closed and said first (AH) and fourth (BL) switches are open and at least one of the following two states: a third state in which said third (AL) and fourth (BL) switches are closed and said first (AH) and second (BH) switches are open and/or a fourth state in which said first (AH) and second (BH) switches are closed and said third (AL) and fourth (BL) switches are open.

Abstract: The joint use in an elastomer composition of an isoprenic elastomer of a precipitated silica including aluminum as a reinforcing inorganic filler, in which the aluminum content of the precipitated silica is higher than 0.5 wt. %, and 3-acryloxy-propyltriethoxysilane as an inorganic filler, or an elastomer coupling agent is described. Also described, is an elastomer composition obtained therefrom and items produced from such a composition.

Abstract: A method for preparing precipitated silicas is described. A precipitation reaction between a silicate and an acidifying agent is also described, wherein a precipitated silica suspension is produced, and, subsequently, separation and drying of the suspension is conducted, in which, inter alia, one of the following three operations (a, b or c) is performed: (a) simultaneously adding a compound of aluminium and a basic agent, (b) simultaneously adding a silicate and a compound of aluminium, (c) simultaneously adding the acidifying agent, a silicate and a compound of aluminium.

Abstract: The invention relates to a method for the production of a bituminous binder and a bituminous binder which can be obtained according to said method. The method for the preparation of the bituminous binder comprises a mixing stage of 0.05 5 wt. % acid, 0.5 25 wt. % rubber crumbs and 70 99.5 wt. % bitumen. The invention also relates to bituminous concretes comprising said binder and a method for the production and use thereof.

Abstract: The present invention relates to a circuit (22) for measuring an efficient current (ieff(t)) of a signal to be monitored (i(t)), characterised in that the circuit includes means for making a continuous reference signal (iDC(t)) depend on the signal to be monitored (i(t) so that the efficient current (iDCeff(t)) of the continuous reference signal (iDC(t)) is equal to the efficient current (ieff(t)) of the signal to be monitored (i(t)).

Abstract: The present invention relates to a circuit (300) for controlling the current in an electrical control member (110) comprising a bridge provided with four terminals (105, 106, 107, 108) and comprising four control switches (AH, AL, BH, BL), a power source (109), PWM control means for at least two of the four switches. The control circuit exhibits a first state in which said first (AH) and fourth (BL) switches are closed and said second (BH) and third (AL) switches are open, a second state in which said second (BH) and third (AL) switches are closed and said first (AH) and fourth (BL) switches are open and at least one of the following two states: a third state in which said third (AL) and fourth (BL) switches are closed and said first (AH) and second (BH) switches are open and/or a fourth state in which said first (AH) and second (BH) switches are closed and said third (AL) and fourth (BL) switches are open.

Abstract: The zirconium phosphate according to the invention is characterized in that it is crystallized and in that it is comprised of particles that are a maximum 30 nm thick. It is obtained by a method wherein initially phosphoric acid and a zirconium compound are placed in an acid medium, whereupon a precipitate is formed; the precipitate is subsequently separated from the medium thus obtained and is dispersed in a phosphoric acid solution whose concentration is maximum 6 M; the medium thus obtained undergoes thermal treatment at a temperature which is at least equal to the boiling temperature of said medium. Said phosphate can be used in the preparation of compositions based on macromolecular materials in order to improve the properties thereof.

Abstract: The invention concerns method for enhancing the physico-chemical properties of bitumen compositions and novel bitumen compositions with enhanced properties and their uses by mixing a functionalized amorphous silica made by combining amorphous silica with a coupling agent.

Abstract: The present invention relates to a polyester-based thermoplastic composition which may be used for the manufacture of hollow bodies such as bottles, films and sheets, especially for packaging. It relates more particularly to a polyester-based thermoplastic composition and to films, hollow bodies or bottles obtained by forming this composition and having improved gas barrier and mechanical properties. The polyester composition comprises a mineral filler composed of a metal phosphate of a tetravalent metal, dispersed in the form of particles having a thickness of less than 40 nm. The compositions of the invention make it possible to obtain formed articles such as films or transparent preforms.