Abstract: A method for controlling a superplastic forming machine for imprinting a shape on a sheet, the machine comprising: a cover; a vat; a press and a peripheral seal for gripping the sheet at its periphery and sealing a pressurized forming chamber delimited by the sheet; members for heating the sheet directly by radiation, these being arranged facing the sheet; a programmable controller. The method involves: determining an initial heating configuration; a finite-element simulation relating to the temperature of the sheet and performed in such a way as to have a temperature that is substantially consistent across the sheet and substantially constant during the course of the forming, in order to obtain a forming specification comprising at least a cycle of powering the heating members and a cycle of pressure in the forming chamber; programming the programmable controller according to the forming specification yielded by the previous simulation.

Abstract: A device used to supply a gas mixture including hydrogen and carbon monoxide at a concentration not exceeding 100 ppm to a main fuel cell which is supplied with air. The device includes a reformer, which is used to convert a fuel into a gas mixture including carbon monoxide and hydrogen, and a purification device to diminish the concentration of carbon monoxide in the gas mixture and that is connected to an anode inlet of the main fuel cell. The supply device also includes an auxiliary fuel cell supplied with air and that receives the carbon monoxide produced by the reformer to convert part of the chemical energy of the carbon monoxide into electrical energy.

Abstract: A titanium-based intermetallic alloy having a high yield stress, a high creep resistance and sufficient ductility at ambient temperature has the following chemical composition as measured in atomic percentages:Al, from 16 to 26; Nb, from 18 to 28; Mo, from 0 to 2; Si, from 0 to 0.8; Ta, from 0 to 2; Zr, from 0 to 2; and Ti as the balance to 100; with the condition that Mo+Si+Zr+Ta>0.4%.Production, working and heat-treatment ranges adapted to the intended use of the material are also defined.

Abstract: The present invention relates to a process for the production of the profile of reflective elements of a light as well as the lights obtained by this process, the light comprising at least two cylindrical reflective elements (5, 5'). This process is characterized in that it comprises the steps consisting of:defining the position of one end (R.sub.o) of the profile of each reflective element (5, 5')defining an illumination function E(.theta.) corresponding to a desired illumination curve, connected to a luminance function L(.theta.) by the formula:E(.theta.)=L(.theta.).multidot.cos.sup.2 .theta.=k?s.multidot.cos.theta.+.rho.r.multidot.sin (.phi.-.theta.)-.rho.r.sub.o sin (.phi..sub.o -.theta.)! cos.sup.2 .theta.if said end (Ro) of the profile of the reflective element (5, 5') is the downstream end of this latter, and an illumination function:E(.theta.)=L(.theta.).multidot.cos.sup.2 .theta.=k?s.multidot.cos.theta.-.rho.r.multidot.sin (.phi.-.theta.)+.rho.r.sub.o .multidot.sin (.phi..sub.o -.theta.)! cos.sup.2 .

Abstract: Reflector for source of radiation, of the plane or cylindrical type, constituted by two reflector elements disposed symmetrically with respect to a plane containing the longitudinal axis of the reflector, each reflector element is constituted by at least one cylindrical part of which the generatrices are parallel to the longitudinal axis of the reflector, the cross-section of this cylindrical part being constituted by a curve such that the rays reflected by the respective ends of this curve constitute two end rays forming respective angles with the plane of symmetry, all the rays reflected on the reflector element being included between the respective angles.

Abstract: A niobium and titanium based alloy having a density less than 6.5 and possessing a high resistance to oxidation at high temperatures in the region of 900.degree. C. has a chemical composition comprising, in atomic percentages:more than 24% Nbfrom 30 to 48% Tifrom 21 to 38% Aland possibly up to 8% of at least one of Cr, Mo, V and Zr.

Abstract: A method for coating a heat engine part, particularly a turbo-machine part made of a superalloy and adapted for use in aeronautical applications, comprises electrophoretically depositing a metallic structure of cellular form with uniformly disposed cells of predetermined size. The deposition is performed using an electrophoresis bath containing methanol, aluminum chloride as an electrolyte, and a powder containing Cr, Al, Y, Ta and Ni. The cellular metallic structure is consolidated by a sintering treatment, which may be reactive, or metallization, preferably in the vapor phase, and the coating is completed by applying a ceramic material by plasma spraying.

Abstract: Superalloy with a nickel base matrix having good mechanical properties when ot in respect of tensile strength, creep resistance, low cycle fatigue and resistance to crack-propagation of which the composition in percentages by weight is as follows: Cr 11 to 13; Co 8 to 17; Mo 6 to 8; Nb less than or equal to 1.5; Ti 4 to 5; Al 4 to 5; Hf less than or equal to 1; C, B, Zr each less than or equal to 500 ppm; Ni remainder to 100. The alloy can be manufactured advantageously by powder metallurgy techniques and used in the manufacture of turbo machine disks.

Abstract: A coating for a heat engine part, particularly a turbo-machine part made of superalloy, comprises an electrophoretically deposited metallic structure of cellular form with uniformly disposed cells of predetermined size, the structure preferably being composed of M, Cr, Al, and Y, where M denotes Ni, Co, Fe and mixtures thereof. The cellular metallic structure is consolidated by a sintering treatment, which may be reactive, or metallization, preferably in the vapor phase, and the coating is completed by a ceramic material applied by plasma spraying.

Abstract: The invention relates to a high molecular weight polyolefin part, particularly for an articular prosthesis and to its production process by shaping in a closed mould. This part, which has a friction surface, has a structure such that the polyolefin chains are oriented parallel to the friction surface, at least in the zone of the part located below or flush with said friction surface. This orientation is obtained during the shaping of the blank of the part in a closed mould having a metal belt, a hemispherical block and a mobile punch, as a result of the choice of shaping conditions, particularly the shaping temperature and the length/transverse dimension ratio of the blank.

Abstract: A method for the assembly and connection of bodies, massive parts or powder grains, of alloys comprising at least 50% of nickel, cobalt or iron, comprises a preliminary operation of deposition at the interface of the said bodies of a product of the type MBF.sub.x, x being equal to 3 or 4, M designating a radical of the type NH.sub.4 giving off when hot a gaseous component such as NH.sub.3 or a metallic element and a sequence of treatment of cleaning/activation by passage of the coated body at a temperature in excess of the temperature of sublimation of the said product.

Abstract: A monocrystalline alloy with a high resistance to creep having a nickel base matrix, with a density of the order of 8.5 and having a percentage, by weight, composition as follows: Co 5 to 8%--Cr 6.5 to 10%--Mo 0.5 to 2.5%--W 5 to 9%--Ta 6 to 9%--Al 4.5 to 5.8%--Ti 1 to 2%--Nb 0 to 1.5%--C, Zr, and B each less than 100 ppm--Ni remainder to 100%. Furthermore, the summation Ta+Mo+1/2 W lies between 11.5% and 13.5% by weight, the atomic sum Ti+Al+Ta+Nb lies between 15.5% and 17%, the atomic sum Ta+Nb+Mo+1/2 W lies between 4% and 5.5%, the atomic sum Ti+Al+Ta+Nb+Mo+1/2 W lies between 17.5% and 19% and the atomic sum Ti+Al lies between 12.8% and 14.5%.

Abstract: The invention relates to a process for air-conditioning a greenhouse or the like for the cultivation of plants, due to the solar energy which is picked up during the day, wherein isothermic containers are disposed inside the greenhouse, which contain a body of which the melting temperature is between 10.degree. and 20.degree. C., so that, during the day, when the temperature inside the greenhouse exceeds said melting temperature, said body melts, absorbing calories and cooling the atmosphere of the greenhouse and, during the night, when the temperature becomes lower than said melting temperature, said body solidifies, releasing the latent heat of solidification.

Abstract: The invention relates to the control and regulation of glycemia (that is the glucose rate in blood) for diabetic patients. The device comprises means for sampling the total blood of a diabetic patient 2, means 9 for determining the glycemia of the blood, an electronic unit 11 providing, as a function of the indications at 9, the operation of pumps 15 apable of injecting insulin or 16 capable of injecting glucose. There are also provided recording means for the glycemia 14 and a sound alarm.

Abstract: This invention relates to new composite materials having, along a director plane, noteworthy mechanical properties, wherein they comprise a resistant material, in flat form disposed parallel to the director plane and flakes or bands or substantially flat form, constituted of or comprising a material with high modulus, said flakes or bands also being disposed parallel to the director plane.