Abstract: The invention relates mainly to a hairspring intended to equip the balance wheel of a mechanical timepiece. It is in the form of a spiraled rod (10) cut from an {001} single-crystal silicon plate. Its structure and its dimensions are calculated so as to minimize the thermal drift of the hairspring/balance-wheel assembly by means of the first and second thermal coefficients of its spring constant.

Abstract: The invention relates mainly to a hairspring intended to equip the balance wheel of a mechanical timepiece. It is in the form of a spiraled rod (10) cut from an {001} single-crystal silicon plate. Its structure and its dimensions are calculated so as to minimize the thermal drift of the hairspring/balance-wheel assembly by means of the first and second thermal coefficients of its spring constant.

Abstract: A process for the electrochemical production of peroxo-disulfuric acid and peroxo-disulfates is provided. In the process, an anode having a partially pre-polarized electrode which has been provided with a doped diamond layer is used.

Abstract: The present invention concerns an electrolytic cell including an anode, a cathode and at least one bipolar electrode arranged between the anode and the cathode. This cell is characterised in that said bipolar electrode includes a substrate and a compact diamond film which is made conductive by a doping agent and which coats said substrate.

Abstract: The invention relates to a protective roof (1) for bicycles comprising a frame (2) and a covering (3) impermeable to rainwater and/or UV-radiation. The frame (2) comprises an elastic tube (4) bent into the form of a spoon-shaped loop, the two tube ends (5a, 5b) being held in the region of the back wheel hub (6) and the end of the frame (2) being adjusted to a predetermined inclination and/or height via a tensioning cable (9) fixed in the region of the handlebar (8).

Abstract: A method for manufacturing a device with micro-shutters, e.g., a light modulating device, includes the following steps: producing a first grid presenting cells; providing a plane support by depositing a layer of organic material on the grid filling the cells; producing a second grid on the layer of organic material; depositing a fine metallic layer on the second grid; cutting shutters and shutter attachments in the fine metallic layer; and removing the organic material layer in the cells to free the shutters.

Abstract: The invention relates to an apparatus for carrying out a process for separating electrolysis bath residues on used anode units removed from electrolysis cells for the production of aluminum by the Hall-Heroult process, said units comprising a cabon residue 5 or "butt", in which are sealed discs 3 interconnected by flanges 2 welded to a suspension rod 13, the axes of the discs 3 being parallel to the axis of the suspension rod 13, said process comprising passing at least one rotary milling cutter 9, of which the axis of rotation 10 in the working position is substantially parallel to the axis of the rod 13, through the space situated between the discs and around the discs 3 and defined by the upper face of the carbon butt 5 on the one hand and the flanges 2 on the other hand.