Abstract: Mixture of alkyl phenyl sulfonates of alkaline earth metals having: (a) from 20% to 70% by weight of a linear mono alkyl phenyl sulfonate in which the linear mono alkyl substituent contains from 14 to 40 carbon atoms, preferably from 20 to 24 carbon atoms, and the mole % of the phenyl sulfonate radical fixed on position 1 or 2 of the linear alkyl chain is between 10% and 25%, preferably between 13% and 20%, and (b) from 30% to 80% by weight of a branched mono alkyl phenyl sulfonate in which the branched mono alkyl substituent contains from 14 to 18 carbon atoms.

Abstract: A carbureted flameholder (30) with optial cooling is provided for a bypass turbojet-engine. The flameholder (30) comprises a body (34) which extends radially into the primary flow. The body (34) is formed by a V-dihedral having two outer plates (35, 36) which intersect at a common ridge apex (37). An air tube (38) is mounted between the two outer plates (35, 36) and at least one fuel conduit (44, 45) is disposed to the rear of the air tube (38). The overall cross-section of the air tube (38) is approximately triangular and the air tube (38) includes a transverse downstream wall that is curved to define a trough (42) in which the fuel conduit (44, 45) is located. The air tube (38) includes orifices (41, 46) directed against the dihedral plates (35, 36) and the fuel conduit (44, 45) to cool them. The fuel conduit includes a nozzle injector (46) directed downstream towards the afterburner chamber (23).

Abstract: A soundproofing panel comprises a honeycomb core sandwiched between a solid skin and a porous skin, the cells of the honeycomb being divided in the direction of its thickness into at least two resonant cavities by a least one partition which is traversed by passages interlinking the cavities. The partitions are formed by a plurality of hollow microbeads having porous walls, the microbeads being bonded to one another and to the walls of the honeycomb at their points of contact. Such a soundproofing panel combines high performance in terms of linearity as a function of the level of sound excitation, attenuation band, bulk and mechanical strength.

Abstract: Mixture of alkyl aryl sulfonates of superalkalinized alkaline earth metals comprising:(a) 50 to 85% by weight of a mono alkyl phenyl sulfonate with a C.sub.14 to C.sub.40 linear chain wherein the molar proportion of phenyl sulfonate substituent in position 1 or 2 is between 0 and 13%, and(b) 15 to 50% by weight of a heavy alkyl aryl sulfonate, wherein the aryl radical is phenyl or not, and the alkyl chains are either two linear alkyl chains with a total number of carbon atoms of 16 to 40, or one or a plurality of branched alkyl chains with on average a total number of carbon atoms of 15 to 48.Inasmuch as these mixtures contain less than 10% of linear mono alkyl phenyl sulfonate substituted in position 1 or 2 of the linear alkyl chain, they exhibit properties making them fit for use as detergent/dispersant additives for lubricating oils.

Abstract: The present invention relates to a process for the preparation of diacids or mixtures of diacids from aqueous solutions derived from the washing of cyclohexane oxidation products. More specifically, the present invention provides a process for the preparation of aliphatic diacids from washing waters derived from a process for the oxidation of cyclohexane and containing peroxides, the process of the invention comprising successively:(a) at least partially deperoxidizing said washing waters by subjecting them to catalytic hydrogenation at a temperature of between about 0.degree. C. and about 100.degree. C., in the presence of at least one platinum group metal;(b) oxidizing with nitric acid the products contained in the washing waters after deperoxidation.

Abstract: Dispersant detergent additives for lubricating oils prepared by neutralization, carboxylation, sulfurization-overalkalinization, carbonation, distillation, filtering and degassing from alkyl phenols containing 35-85% by weight of linear alkyl substituents. The process does not require, during the neutralizing phase, the presence of a third solvent, which, by forming an azeotropic mixture with water promote the elimination of water arising from the neutralizing reaction. The additives of the invention have improved stability to hydrolysis and improved dispersion properties, improved compatibility and improved foaming properties.

Abstract: A superalkalinized alkylaryl sulfonate of alkaline earth metal is disclosed. The aryl radical is either a tolyl, xylyl, o xylyl, ethyl phenyl, or cumenyl radical. The alkyl chain is a linear chain that contains between 14 and 40 carbon atoms, and the aryl sulfonate radical of alkaline earth metal is fixed, in a molar proportion comprised between 0 and 13% in positions 1 or 2 of the linear alkyl chain.

Abstract: Objectionable byproduct aqueous effluents containing contaminating amounts of hydroxynitroaromatic compounds, in particular those aqueous effluents produced during the synthesis of nitroaromatic compounds, e.g., dinitrotoluenes, via reaction of an aromatic compound with nitric acid in the presence of sulfuric acid, are efficiently, facilely and economically treated/removed by (a) intimately contacting a mixture of at least one nitroaromatic compound and at least one hydroxynitroaromatic compound with an aqueous wash medium containing a neutralizing agent, (b) separating the resulting admixture into an organic phase and an aqueous phase, (c) recycling a fraction of the separated aqueous phase to the aqueous wash medium to thus constitute a portion thereof, and (d) periodically draining a fraction of the wash medium, whether to destruction thereof or to waste.

Abstract: Dispersant detergent additives for lubricating oils prepared by neutralization, carboxylation, sulfurization-overalkalinization, carbonation, distillation, filtering and degassing from alkyl phenols containing 35-85% by weight of linear alkyl substituents. The process does not require, during the neutralizing phase, the presence of a third solvent, which, by forming an azeotropic mixture with water promotes the elimination of water arising from the neutralizing reaction. The additives of the invention have improved stability to hydrolysis and improved dispersion properties, improved compatibility and improved foaming properties.

Abstract: A method of preventing instabilities due to combustion in a multi-flow turbojet engine including an afterburner into which an air-fuel mixture is injected in proportions measured in richness terms, which includes the steps of detecting experimentally, when tuning the turbojet engine, the zones of vibrations due to afterburn as a function of the operating conditions of the engine and as a function of the afterburn operating region, and selecting operating points for regulating the fuel richness of each flow to enable the detected vibration zones to be avoided.

Abstract: Processes for preparing normal and overbased metal sulfurized alkylphenates. The processes am characterized by a sulfurization reaction using a lower carboxylic acid catalyst which does not use a polyol promoter, e.g., ethylene glycol. The process affords a metal sulfurized phenate product which is essentially free of polyol oxidation products. The products are useful as additives for lubricating oils.

Abstract: Objectionable byproduct aqueous effluents containing contaminating amounts of hydroxynitroaromatic compounds, in particular those aqueous effluents produced during the synthesis of nitroaromatic compounds, e.g., dinitrotoluenes, via reaction of an aromatic compound with nitric acid in the presence of sulfuric acid, are efficiently, facilely and economically treated/removed by (a) intimately contacting a mixture of at least one nitroaromatic compound and at least one hydroxynitroaromatic compound with an aqueous wash medium containing a neutralizing agent, (b) separating the resulting admixture into an organic phase and an aqueous phase, (c) recycling a fraction of the separated aqueous phase to the aqueous wash medium to thus constitute a portion thereof, and (d) periodically draining a fraction of the wash medium, whether to destruction thereof or to waste.

Abstract: A device for loading and/or unloading the racks of a lyophilization tank operates such that vials 5 are collected and stored on a vibrating table 2 equipped with a mobile arm 8 blocking the vials on at least a part of the tray 3 of the vibrating table. A mobile transfer frame 11 carrying retractable flaps 15, 16 is adapted for moving between the flat surface 10 of a mobile carriage 1 and the tray 1 of the vibrating table for collecting and transferring the accumulated vials.

Abstract: The method and the corresponding installation detect sealing faults in metal protective tubes for protecting cables having electrical and/or optical conductors, referred to as "protected components", embedded in a sealing material filling the tube. The method consists in priming said sealing material with a detectable "test" gas either prior to or during injection of said material into said tube in a first station for enclosing the protected components inside the tube, and in causing said tube, filled in this way and optionally heated, to advance continuously past a detector, or inside a detection chamber of a second station containing the detector, either directly after the tube has been filled or at a subsequent stage. Application: land or under-sea cables, in particular for monitoring fluid-tight protective microtubes for protecting optical fibers.

Abstract: Disclosed is a pre-diffused logic integrated circuit, a part of which is converted into an analog circuit. A pre-diffused logic circuit includes a plurality of logic circuits, each formed by non-wired signal transistors. If the fan-out of a logic operator has to be increased, the transistors of a neighboring logic cell are parallel mounted so that at least two signal transistors are parallel mounted to make an amplifier transistor therefrom and at least two transistors are connected to make a current source therefrom for this amplifier. This conversion is done during the final metallizations for customizing the pre-diffused circuit.The present invention finds particular application in fast logic circuits.

Abstract: Disclosed is a logic integrated circuit for which the time of switching over between two logic states, 0 and 1, is adjustable. In a logic operator such as an inverter, the switch-over time, at the output, is a function of the current put through by the load transistor or by the signal transistor. This time is adjustable, either as rising time or as fall time, by the replacement of at least one single-drain transistor by a multiple-drain transistor, the throughput rate of which is fixed by the number of connected drains. The disclosed device can be applied to pre-diffused (Si) circuits or pre-implanted (GaAs) circuits.

Abstract: An urban delivery motor vehicle, provided with a front towing unit having a vertical front-rear symmetry tiable to a towed unit, and comprising a central part forming a driver-passenger cockpit substantially symmetrical about a substantially vertical axis and having a rear part provided with a space located below the cockpit and opened on its sides and on its rear part; two front wheels and at least one rear wheel located within the space and coplanar with the vertical front-rear symmetry of the towing unit, and an attachment located close to the vertical axis for receiving a complementary attachment of the towed unit to link it thereto.

Abstract: The invention relates to cosmetic compositions comprising at least one wax having a melting point of 60.degree. to 110.degree. C., at least one cationic polymer having a molecular weight of between 1,000 and 3,000,000, at least one anionic polymer and ingredients normally used in cosmetics.