Abstract: Radiation detector comprising one or more amplifying structures, each comprising an input electrode and an output grid which are kept separated by an insulating spacer. Each spacer defines amplification spaces for generating electrons by the avalanche effect. The dimensions of these amplification spaces are decorrelated with those of the mesh cells of the output grid.

Abstract: The pyrolysis process for fluid effluents in an enclosure, where they are transformed into solid and gaseous products is characterized in that the said effluents are heated on contact with solid elements, on traversing a pile of said solid elements offering a surface contact per volume unit at least equal to 10 m/m and in that the said solid products are trapped on the surface of said solid elements and are then separated from the latter, so as to be able to regenerate the said solid elements. Continuous or discontinuous pyrolysis apparatus for performing the process according to the invention. Application to the destruction of chlorinated effluents.

Abstract: Apparatus for depositing diamond on a substrate assisted by microwave plasma, comprising two zones, a plasma formation zone located in a waveguide and a diamond deposition zone located outside the waveguide. The apparatus includes means making it possible to form a stable plasma in the deposition zone, so as to considerably increase the substrate surface which can be treated.

Abstract: This burner comprises a gas distributor (20) with a row of gas injectors (5a to 5e), the tube being axially inside an air distributor tube. Each gas injector extends through the wall of the air distributor tube via a coaxial air outlet aperture. The gas distributor tube includes two sealing bodies (36, 37) sliding symmetrically on either side of a central gas inlet aperture (21). Each of these bodies is provided with an eccentric longitudinal threaded bore (38, 39) engaging a threaded section of a rotating control rod (41). The two sections (48, 49) are threaded in opposite directions to the thread of the sealing bodies (36, 37), which enables them to move these two sealing bodies simultaneously in order to gradually interrupt or restore the supply of gas to the injectors (5a to 5e) situated at the end of the row without interrupting the supply to the air injectors.

Abstract: The invention concerns a thermal transfer layer with high transfer coefficient between two materials which can have different expansion coefficients. The thermal transfer layer comprises expanded graphite inserted between the materials which are selected from among carbonaceous materials, ceramics and metals or metal alloys. The expanded graphite is either inserted in the form of a rolled or compressed sheet, or is compressed in situ. The invention also concerns a device for the cooling of a structure subjected to intense, continuous, intermittent or pulsating heat flux, by means of fluid circulation tubes placed in the passages in the structure. A flexible material which is a good heat conductor in a compressed state, such as expanded graphite, is placed between the structure to be cooled and each tube.

Abstract: The invention concerns a process for the production of vapor-deposited carbon fibres wherein a gaseous or vaporized hydrocarbon which is entrained by a carrier gas is pyrolyzed on a substrate in a flow reactor at a temperature of between 950.degree. and 1300.degree. C. in two successive stages, a germination stage and a growth stage.The process comprises the following steps:preparing a gaseous mixture comprising from 50 to 90% and preferably from 85 to 65% by volume of hydrogen and/or helium and from 10 to 40% and preferably from 15 to 35% by volume of methane;circulating the mixture in the reactor over a substrate comprising from 10.sup.-8 to 10.sup.-4 g/cm.sup.2 of a catalyst selected from iron, nickel, cobalt and alloys thereof;initiating germination and growth of the carbon fibres in respect of length at a temperature t1 which is stabilized at between 950.degree. and 1050.degree. C.

Abstract: The invention relates to the production of spectacle frame parts of synthetic material and in particular to the moulding of spectacle frame faces of synthetic material, for example, of polyurethane.The faces are moulded between two casting half-moulds each comprising a plate having an impression on one surface thereof. Each plate has a substantially equal thickness at every point and is made of a polyolefine. Use of such half-moulds enables the faces of spectacle frames to be directly moulded into their final shape.