Abstract: A pressurized gas circuit-breaker pole includes a first enclosure or pole head having a first envelope with a first connecting flange including a circular orifice. The envelope contains a first mobile assembly terminating in a coupling member coaxial with the orifice. A second enclosure constituting an insulative column includes a second envelope having a second connecting flange with a circular orifice. The second envelope contains a second mobile assembly having a link for maneuvering the first mobile assembly and its end including complementary arrangements for coupling it with the coupling member. The connecting flange of each enclosure has an annular elastomer seal fixed to the corresponding connecting flange and through which the corresponding mobile assembly passes. The seal of each enclosure provides, during assembly of the flanges and coupling of the internal mobile assemblies, a sliding seal. The seal is broken on completion of assembly.

Abstract: A pressurized gas circuit-breaker pole that can be assembled and disassembled without significant lose of gas includes a first enclosure or pole head including a first envelope including a first connecting flange including a circular orifice. The envelope contains a first mobile assembly terminating in a coupling member coaxial with the orifice. A second enclosure constituting an insulative column includes a second envelope including a second connecting flange including a circular orifice. The second envelope contains a second mobile assembly consisting of a link for maneuvering the first mobile assembly and its end including complementary arrangements for coupling it with the coupling member. The connecting flange of each enclosure is fitted with an annular elastomer seal fixed to the corresponding connecting flange and through which the corresponding mobile assembly passes.

Abstract: A closure resistor assembly for high voltage electrical gear. The assembly includes a multiplicity of resistive electrical components aligned in a row along an axis, and a mechanism which exerts a compression force on the electrical components along the axis so as to maintain electrical contact between them. The mechanism for exerting the compression force includes a rigid tube within which the electrical components are stacked, and an energy-storing floating structure placed inside the tube at one end of the row of electrical components. The floating structure is constituted by a first piece disposed between the end of the row of electrical components and a second piece that is mounted in a fixed manner inside the tube, together with a spring that is kept in compression between the first and second pieces. The first piece is also mounted so as to be semi-moving between two abutments that are spaced-apart along the axis D.

Abstract: A method of modelling at least travel time and apparent dip from seismic data that has been processed by at least one migration operator comprising the steps of taking the mid-point (N.sub.1) of a source (S)/receiver (R) system, applying ray tracing to the system relative to a given reflector, processing the parameters of the ray using a migration operator to obtain a first point of arrival (N'.sub.1) marked on the model, determining the offset (.DELTA.e1), and proceeding iteratively at each new point of arrival (N'.sub.i) until the offset (.DELTA.E) is less than or equal to the predetermined offset (.DELTA.e).

Abstract: The invention relates to a method for the mass production of an entomophagous insect such as Trichogramma maidis insect from a substitution host such as the egg of the meal moth Ephestia kuehniella, as well as a device for implementation of this method and the application of the method to the biological fight against maize crop ravagers.

Abstract: A valve for the escape of compressed air in order to extinguish the electric arc between the moving contacts of a circuit-breaker. The arrangement includes an intermediate moving structure between the control rod and the compensated force valve with two seats, said structure being constituted by a cylinder integral with one of the seats and a piston which cooperates with the control rod in order to transmit a rapid and reliable control command.

Abstract: An articulated contact finger of very high voltage gasblast circuit-breaker. It is characterized in that the pin on which the finger is articulated is disposed between the contact piece and a spring which provides the force required at the contact point, a first support of the stationary articulation pin being situated between the articulation pin and the spring, said spring being disposed between said first support and a second support providing fixing means for the flexible connection connected to the contact point.