Abstract: To remove a layer of thermoplastic material, particularly of polyethylene, adhering to a substrate, particularly a strip of aluminum, there is directed against a region of the layer of thermoplastic material (2) a shaped jet (10) of hot inert gas, containing for example principally helium, to melt the thermoplastic material and the jet is displaced relative to the coated substrate to push back (11) the melted thermoplastic material. The gas or the gaseous between 300.degree. C. and 700.degree. C., by an electric resistance (20), adjacent the ejection nozzle (4).

Abstract: A method of liquefying a low-boiling gas, in which gas is compressed to a high pressure, is cooled in heat exchange structure and is isenthalpically expanded to condense a portion of the same to liquid. The liquid being separated from residual gas and the residual gas is used to cool the heat exchange structure and is then recycled. A portion of the gas is compressed to an intermediate pressure between the high and low pressures, is isentropically expanded at a first temperature and is used to cool a relatively warm portion of heat exchange structure and is then recycled. A portion of the high pressure gas is isentropically expanded at a second temperature and used to cool a relatively cool portion of the heat exchange structure and then again isentropically expanded at a third temperature to that low pressure and returned through the heat exchange structure to cool the same and is then recycled.

Abstract: The plasma producing gas consists of a ternary mixture of helium, argon and hydrogen and contains at least about 10% hydrogen, typically 30 to 70% helium, 10 to 50% argon and 10 to 25% hydrogen, preferably 20% (.+-.5%) hydrogen. Use for the plasma projection of metallic oxide.

Abstract: A projection device for depositing by projection a fused coating material onto a substrate. The projection device includes a projection nozzle having a central part defining a central passage for the coating material to be fused and projected. The central passage opening at a distal end thereof into a central orifice. The central part being fitted in a peripheral part. Ejection openings of ducts of oxycombustible mixture being distributed around the central orifice according to at least two series which are alternatingly offset from one another with respect to a main axis of the nozzle. The ducts include channels which are milled in the periphery of the central part. The carrier gas contains between 1 and 10% oxygen with the remaining portion consisting of nitrogen. The carrier gas being supplied by a unit for the separation of inert gas from air by adsorption or permeation. The projection device is particularly suited for the formation of the anti-corrosive deposits based on zinc.

Abstract: Gas-filter in the form of an axisymmetric one-part cartridge (1), characterised in that it is essentially constituted by:a) a rigid ring (2) comprising an axisymmetric lateral wall (21) bounded by a flat-forming extremity (23) and by another, fold-down extremity (24), openings (22) being disposed on the wall (21) between the extremities (23) and (24),b) a gas-impermeable backing piece (3) surrounding on the outside the lateral wall (21) of the ring (2) by bearing on the plane extremity (23) of the ring (2) and crimped into the fold-down extremity (24) of the ring (2),c) filter elements (4) disposed between the ring (2) and the backing piece (3).

Abstract: A process for the cryogenic separation of mixtures containing oxygen to obtain a produce having a high concentration of oxygen. In this process, a heat and material exchange occurs in counter-current between a descending liquid and a rising gas in at least one transfer zone including a bundle of organized linings consisting of cross-undulated metallic layers. In at least one transfer zone where the concentration of oxygen is higher than 98%, the layers are made of a sheet of aluminum having a thickness between 0.3 and 1 mm. Additionally, the bundles of layers have a specific surface lower than 400 m.sup.2 /m.sup.3.

Abstract: A membrane nitrogen generator adapted to deliver a flow rate of nitrogen gas having a purity at least equal to P.sub.0, which contains:a) a source of compressed nitrogen containing gas having a purity lower than P.sub.0, the source having a maximum flow rate Fm.sub.1 ;b) a varyer connected to the source, which is adapted to vary the flow rate of the source between Fm.sub.1 and 0;c) a nitrogen membrane fed by the source which is capable of delivering a low purity nitrogen gas having a purity P.sub.1, which purity is lower than P.sub.0 at the maximum flow rate Fm.sub.1 ;d) a source of high purity compressed nitrogen gas having a purity which is greater than P.sub.0 which has a controllable flow rate of from 0 to a maximum flow rate value of Fm.sub.2 ;e) a mixer; andf) a purity controller.

Abstract: An accessory for the preparation of a creamy air-milk-steam emulsion to produce Italian cappuccino, is mounted at the end of a steam outlet pipe (2) of an espresso coffee machine. The accessory comprises an aspiration chamber (3) communicating with the steam outlet pipe, a first lateral opening (4) which communicates with a receptacle containing milk, a second lateral opening (5) in communication with the atmosphere, and a third opening (6) through which leaves a first mixture which flows into an emulsion chamber (7) having a first outlet (8). The receptacle containing the milk is integral with the accessory. The invention is applicable to a cappuccino accessory fixed on a steam outlet pipe of a coffee-making machine.

Abstract: The compression circuit for a gaseous fluid, typically helium, which is present in a first container at a pressure lower than 20 hPa and a temperature lower than 4.2K is compressed by means of a plurality of compressors mounted in series, at least one heat exchanger being disposed in the chain of compressors and cooled through said fluid at a temperature higher than the temperature of the fluid in the first container, said fluid originating from a second fluid container which is associated with a refrigerating cycle. Application for example to devices for cooling supraconductor elements.

Abstract: Bipolar electrode for an electrolyser of the series type, comprising two metal plates (1, 2) arranged in parallel facing each other, an electrically conductive solid mass (3) maintained under pressure between the two plates and a means for heating the solid mass to a temperature which is at least equal to its flow temperature. The bipolar electrode is suitable for electrolysers of the series type, in which sodium chlorate and hydrogen are produced by electrolysis of aqueous sodium chloride solutions.

Abstract: The invention relates to flame-retardant rigid polyurethane foams produced using halogenated polyetherpolyols and at least one blowing agent chosen from 1,1-dichloro-1-fluoroethane and 1,1,1-trifluoro-2,2-dichloroethane in the presence of ethylene glycol. It also relates to compositions intended for their manufacture and to a process for manufacturing them.The rigid foams according to the invention exhibit an improved fire resistance and an improved dimensional stability.

Abstract: Process for guiding the excavation tool used in order to execute the trenches necessary for the construction, by successive or alternating panels, of a wall cast in the ground, according to which:a) an excavation tool fitted with a first guiding element is provided,b) at the end of a previously executed trench, a second guiding element is arranged extending substantially over the entire depth of this trench, and thenc) after construction of the panel in the previously executed trench, the guiding elements are mutually engaged; andd) the excavation tool is controlled so as to create a force tending to keep the guiding elements mutually engaged while the excavation of the following trench is performed.

Abstract: This invention relates to the paper-making domain and especially to a forgery-proof safety paper, which includes on its surface and/or in its mass, at least one compound responding to formula: ##STR1## in which: R.sub.1, R.sub.2, R.sub.3 may be either H, OH, or OR,R being a hydrocarbon chain, substituted or not, straight, cyclic or aromatic,with A forming one or more cycles, substituted or not. This invention is particularly applicable to forgery-proof safety papers such as cheques or handwritten documents for payment.

Abstract: The selective adsorption of nitrogen from air is used in a system including a number of adsorbers, to give oxygen enriched gas at elevated pressure, the adsorber is regenerated by depressurization under atmospheric pressure with a pump and by repressurization with oxygen enriched gas. The pumping duration is at most equal to the duration of the production step.

Abstract: A compound useful in the synthesis of peptides containing arginine, and including a guanidine group and an unsubstituted tetraphenylborate ion, and having the formula: ##STR1## wherein A is a hydrogen atom, an amino acid group which is linked by a peptide bond and which may be substituted, a peptide radical which is linked by a peptide bond and which may be substituted, or an aliphatic or aromatic radical effective as a protecting group or an activating group, and wherein Y is an hydroxyl group, a halogen atom, an amino group, an amino acid group which is linked by a peptide bond and which may be substituted, a peptide radical which is linked by a peptide bond and which may be substituted, or an aliphatic or aromatic radical effective as a protecting group or an activating group.

Abstract: The valve slide, which is slidably mounted in a housing of a valve member, comprises a central part including a shaped part cooperating with a first joint between a first zone and a second zone of the housing, and an end part including a peripheral joint between the second zone and a third zone, the three zones being in communication with three respective circuits of a pneumatic distribution block.

Abstract: This device comprises a packet of corrugated plates (3) each disposed in a generally vertical plane, the corrugations being oblique and descending in opposite directions from one plate to the following plate. Each corrugation valley (5) having a lower end opening out laterally includes an projecting obstacle (7) in the vicinity of this lower end.Application in air distillation columns.

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: A sheath for insulating a volume that optionally contains an object is made of a resilient material and it has a join plane which is shaped to constitute a baffle.