Abstract: A mixer for delivering a mixture of two gases G.sub.1 and G.sub.2 in proportions respectively and by volume of X/100 and (100-X)/100; X/100 not being allowed to be smaller than a particular value. Each gas circuit comprises a pipe provided with a cock for adjustment of the rate of flow and with a calibrated orifice selected in such manner that for an identical pressure P, the rates of flow of the gases through these orifices are in the ratio X/(100-X), with devices for limiting the pressure of the gas G.sub.2 to that of the gas G.sub.1, as well as for limiting the pressure in both circuits. The invention is applicable to an oxygen-nitrous oxide mixer for anaesthetic purposes, in which the proportion of oxygen in the mixture supplied cannot drop below 25% and the flow rate of nitrous oxide cannot exceed a predetermined maximum.

Abstract: N-(1-allyl-2-pyrrolidinyl-methyl) 2-methoxy-4-amino-5-methylsulfamoyl benide and derivatives thereof, which are useful in the treatment of anomalies in cerebral hemodynamics of patients subject to migraines.

Abstract: The composite bimetallic roll for cold rolling obtained by casting comprises a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%. The chromium/carbon ratio is between 11 and 16 and the structure of the case metal is martensitic with a content of residual austenite of less than 10%.

Abstract: In order to stop the continuous stream of liquid nitrogen supplied through the outlet conduit 4 of the device 2 for regulating the pressure, this conduit is provided with a stop electrovalve 5A combined with a degassing device 27 so that the flow of plain liquid in normal operation is not disturbed. Application to the pressurization of preserving boxes or cans by vaporization of liquid nitrogen.

Abstract: The case 2 of the container 1 having a vertical axis X-X contains two adsorbent beds 3,4 in the form of sleeves retained by three cylindrical grates 5, 6, 7. The intermediate grate 6 is axially rigid and radially flexible while the innermost and outermost grates 5,7 are axially flexible and radially rigid. This enables the container and the adsorbent beds to support without damage the successive heating and cooling stages in the course of the adsorbent regeneration stages. Application to the purification of large amounts of air intended to be distilled.

Abstract: Bottles 1 are disposed in an inverted position in small groups on a tray which is placed in position on a lower frame 25 of a programmed raising and lowering portal 6. Upon each lowering of the portal, the necks of the bottles are dipped into a bath of liquid nitrogen which is maintained at a constant level. The dippings, for example three in number, are separated by stages in which the necks of the bottles are maintained out of the bath. The last dipping terminates when the necks are partly frozen, and the bottles are then conveyed to a disgorging station where the mass of ice formed is expelled so as to eliminate the sediment coming from the fermentation of the champagne.

Abstract: The region 1 to be cooled contains the evaporator of a heat pipe 2 which contains a diphase fluid adapted to the desired temperature between about 0.degree. and -100.degree. C. The condenser 7 of the heat pipe is cooled to a set temperature by a copper ring 8 which is cooled by a regulated liquid nitrogen current. Applications in the freeze trapping of solvents contained in a gaseous current.

Abstract: There is effected an accelerated direct neutralization in-situ of the substrates which are impregnated with alkaline hydroxide which is free or fixed on the cellulose, by contact with a neutralizing fluid containing carbon dioxide in a gaseous, aqueous or combined phase, this fluid being introduced in accordance with requirements related to the quantity of alkali to be neutralized. The process may be used in the textile industry in continuous and discontinuous treatments and is adaptable to all types of textile machines employing an aqueous method.

Abstract: The device measures the flow of a fluid and comprises a rotor 16 having vanes which is driven in rotation by a stream of fluid in a sealed housing 11 having a circular cross-section and provided with a supply nozzle and a discharge nozzle for the fluid which are in alignment and disposed tangentially to the rotor so that the fluid stream issuing from the supply nozzle encounters the vanes 1 in a direction perpendicular to the axis of rotation 17 of the rotor. The rotor 16 has two lateral flanges 16a, the vanes, the flanges and the housing defining, apart from a clearance for permitting the rotation of the rotor, a series of compartments which communicate by way of that clearance with two lateral chambers 12a of the housing. The invention is in particular applicable to the measurement of small flows of gas under high pressure.

Abstract: The solid particles 33' coated with a biological material are developed at the upper end of a bed 32 which is fluidized by a supply of water 3. The particles 33' are removed at 12 and decanted at 11 and then introduced through a pipe 20 at the upper end 22 of an auxiliary anaerobic fermentation column which converts the biological coating into a gaseous mixture which escapes at 27. The regenerated particles are withdrawn at 28 and conveyed at 30 to the purifying bed. Application in the biological purification of waste waters.

Abstract: In a surface hardening process for metal parts by nitriding or carbonitriding, the parts to be treated are placed in a furnace and maintained at a temperature of between 490.degree. C. and 750.degree. C., in a nitrogen bearing atmosphere, such atmosphere formed by introducing into the furnace a gaseous mixture comprising in particular ammonia and an oxidizing gas for accelerating the catalytic dissociation of ammonia in contact with said parts. The oxidizing gas is nitrous oxide and the gaseous mixture contains about 0.1% to 10% by volume of nitrous oxide. The invention is well suited for the surface hardening of steel parts.

Abstract: According to the process, a mixture of powdered mineral substances is introduced at one end of a furnace and this mixture is heated, and the molten glass thus obtained is continuously discharged at the other end of the furnace. The mixture is heated by means of at least one air-fuel flame and at least one oxygen-fuel flame. A current of auxiliary gas which is concentric to and surrounds the oxygen-fuel flame is injected into the furnace.

Abstract: The present invention relates to a continuous coating process by a layer of Zn, Al or of a Zn-Al alloy for a cold laminated steel band comprising a heating thermic cycle, followed by a rapid cooling, a tempered coating in the metal bath of coating in fusion, at a temperature from 460.degree. to 500.degree. C., and a subsequent cooling, characterized in that after the tempered coating, the coated steel band is subjected to an over-aging treatment by maintaining the band at a temperature comprised between 430.degree. and 270.degree. C. during at least two minutes.This process is carried out in an installation comprising an over-aging chamber.

Abstract: In order to improve electric arc penetration of an arc welding torch, the angles of convergence .alpha. and .beta. of a sleeve and a nozzle of the torch are selected within an area which is inscribed in a quadrangular figure defined by the coordinates (.alpha., .beta.) with corners, or apices, at the four following points:______________________________________ .alpha. = 17.5 degrees S'.sub.1 : .beta. = 27.5 degrees .alpha. = 7.2 degrees S'.sub.2 : .beta. = 20 degrees .alpha. = 7.5 degrees S'.sub.3 : .beta. = 15 degrees .alpha. = 17.5 degrees S'.sub.4 : .beta. = 7.5 degrees ______________________________________The disclosed arc welding torch is favorably employed in an inert gas welding process.

Abstract: A method and system of selecting items of data from a stream of information by comparing the information to reference data. The reference data items are recorded in the form of logical entities in a two dimensional memory table. The reference logical entities of different types are stored vertically in different horizontal zones of the table in the order in which the entities of the same type are found in the file. In a control memory are stored, line-by-line, control information which specify the comparisons to be made between the reference logical entities and logical entities which are received from the file, as well as control information related to storage of logical entities received from the file and of operations including comparisons and storage between comparison results and other data contained in the table and information related to the linkage of processes for each control line of the control memory or from one control line to another.

Abstract: A cryogenic fluid in the liquid phase is put in contact with a metal material maintained in a closed treating vessel, the cryogenic fluid which contains the solid particles formed is exhausted from the vessel, and the solid particles are separated from the cryogenic fluid and collected. The metal material is heated by induction heating with a high-frequency current and maintained in levitation in the cryogenic liquid. The process is applicable to the production of ultra-fine powders from metals which are only slightly volatile.

Abstract: The method of carburizing steel workpieces comprises loading workpieces to be carburized in a furnace and maintaining them in a carbon enriching atmosphere comprising carbon monoxide, hydrogen and nitrogen. The treatment comprises a first phase carried out at a temperature from 850.degree. C. to 1050.degree. C. followed by a second phase carried out at a temperature from 700.degree. C. to 950.degree. C. During the first phase an atmosphere is used having a carbon potential from about 1.1% to about 1.6% by weight and during the second phase the amount of nitrogen in the atmosphere is increased from two to thirty times so that the carbon potential for the second phase is at least about 0.5% by weight less than the carbon potential for the first phase.

Abstract: A process for fractionating a suspension of solid particles in a liquid, of he type wherein said suspension is made to pass through a filtering screen, characterized in that said suspension is directed in a direction parallel to the longitudinal axis of an elastically deforming, flexible, perforated sleeve forming a filtering screen, and in that a sequence of high and low pressures is continuously created within this sleeve and travels at least predominantly opposite the direction of the suspension flow. The invention also applies to equipment.

Abstract: The process concerns a selective refining of molten metals or alloys contained in a closed treatment container in the form of a bath 10. A solid or liquid cryogenic body 13 is brought into contact with the surface of the bath of metal 10 so as to convert, by evaporation-condensation, the vapors (vz) of the impurity or impurities to be eliminated from the bath into solid particles (pz) entrained by the vapors (vf) of the cryogenic body, and the bath of metal 10 is simultaneously stirred.

Abstract: The gas originating from the expansion during the stage (T.sub.6) is directed into a buffer tank and each adsorber has an operating cycle delayed by 1/nth of the cycle period (T) with respect to a preceding one, and each production stage has a duration of (x/n)T, "n" being greater than or equal to 6, and "x" greater than or equal to 2, and each expansion stage at an intermediate pressure has a shorter duration than each elution stage.