Abstract: A method for generating an alarm is implemented by an alarm-generating device installed in an aircraft. It comprises: a step of obtaining information delivered by a sensor of said device and representative of an oil flow rate inside an oil filter of the aircraft; a step of obtaining a temperature delivered by a sensor of said device and representative of a temperature of the oil inside said filter; a step of obtaining a differential pressure at said filter; and a step of generating an alarm if the differential pressure exceeds an alarm threshold obtained on the basis of said information and of said temperature.

Abstract: A method for isolating a tank of oil from a downstream portion of an oil supply system for a turbine engine is provided. The oil supply system includes the oil tank and a cutoff valve located between the oil tank and the downstream portion. The cutoff valve is configured to limit a flow of oil towards the downstream portion. The cutoff valve is fluidically linked to a fire extinguishing system by a fluid communication device. The method includes closing the cutoff valve in response to an increase in extinguishant pressure in the fluid communication device.

Abstract: The invention relates to a device (11) for cooling oil for a turbine engine, such as an aircraft turbojet or turboprop engine, characterized in that it comprises a duct (12) for circulating a flow of cold air (F1), means (16) for injecting oil into the duct, and means (19) for extracting the oil mixed with the flow of cold air (F1), located in the duct (12), downstream from the injection means (16).

Abstract: A method for isolating a tank of combustible fluid from a downstream portion of a fluid supply system for a turbine engine is provided. The supply system includes the tank and a cutoff valve located between the tank and the downstream portion. The cutoff valve is configured to limit a flow of fluid towards the downstream portion. The cutoff valve is fluidically linked to a fire extinguishing system by a fluid communication device. The method includes a step of closing the cutoff valve in response to an increase in extinguishant pressure in the fluid communication device.

Abstract: A lubrication system for a turbopropeller, includes an oil feed device for at least one enclosure and one equipment, the equipment being connected to the feed device via a displacement pump, and a pressure restricting valve mounted downstream of displacement pump and in parallel to the equipment, such that oil flows through the equipment when the same is active, and through the valve when the equipment is inactive.

Abstract: The invention relates to a device (11) for cooling oil for a turbine engine, such as an aircraft turbojet or turboprop engine, characterised in that it comprises a duct (12) for circulating a flow of cold air (F1), means (16) for injecting oil into the duct, and means (19) for extracting the oil mixed with the flow of cold air (F1), located in the duct (12), downstream from the injection means (16).

Abstract: A circuit and a method for feeding oil to rolling bearings in a turbomachine is disclosed. The circuit includes an oil supply; an oil duct connecting the supply to lubrication enclosures, each enclosure containing at least one rolling bearing; an oil feed pump located between the supply and the lubrication enclosures; an oil recovery pump connected downstream from each lubrication enclosure; a pressurizing valve placed in the duct between the oil feed pump and the lubrication enclosures, the pressurizing valve being adapted to open when the pressure at its inlet exceeds a predetermined threshold pressure; a branch connection duct connecting the inlet of the pressurization valve to one of the lubrication enclosures in order to feed it with oil; and a feeding device which feeds the lubrication enclosures at a small oil flow rate so long as the pressure at the inlet of the pressurization valve has not reached the predetermined threshold.

Abstract: A lubrication system for a turbopropeller, includes an oil feed device for at least one enclosure and one equipment, the equipment being connected to the feed device via a displacement pump, and a pressure restricting valve mounted downstream of displacement pump and in parallel to the equipment, such that oil flows through the equipment when the same is active, and through the valve when the equipment is inactive.

Abstract: There is provided a predominantly open-cell polyurethane foam obtained from a predominantly open-cell polyurethane foam-forming reaction medium which comprises: a) at least one polyol; b) at least one polyisocyanate; c) at least one catalyst; d) water; e) a predominantly open-cell polyurethane foam-forming amount of at least one surfactant which is a balanced, substantially linear polyether-polysiloxane ABA? block copolymer; and, f) optionally, at least one additional component selected from the group consisting of other polymer and/or copolymer, chain extender, crosslinker, non-aqueous blowing agent, filler, reinforcement, pigment, tint, dye, colorant, flame retardant, antioxidant, antiozonant, UV stabilizer, anti-static agent, biocide and biostat.

Abstract: A method for detection of contamination, by another fluid, of the oil circuit of a turbomachine fitted on an aircraft, the oil circuit including a tank provided with a device for measuring its oil level, piping which connects the tank to the various units of the turbomachine to be lubricated, and a device for putting the oil into circulation between the tank and the units, the turbomachine including a device for measuring its engine speed and a device for measuring the temperature of the oil at one point at least of the oil circuit. The oil level in the tank is monitored, an alert is triggered if the decrease in the oil level, measured over a given interval of time, becomes lower than a set minimum decrease. The decrease can be replaced by a simple increase in the oil level, without taking a duration of the monitoring into account.

Abstract: The invention relates to a circuit and a method for feeding oil to rolling bearings in a turbomachine, the circuit comprising an oil supply, an oil duct connecting the supply to lubrication enclosures, each containing at least one rolling bearing, an oil feed pump located between the supply and the lubrication enclosures, an oil recovery pump connected downstream from each lubrication enclosure, and a pressurizing valve placed in the duct between the oil feed pump and the lubrication enclosures, said pressurizing valve being adapted to open when the pressure at its inlet exceeds a predetermined threshold pressure; a branch connection duct connecting the inlet of the pressurization valve to one of the lubrication enclosures in order to feed it with oil; and means for feeding the lubrication enclosures at a small oil flow rate so long as the pressure at the inlet of the pressurization valve has not reached the predetermined threshold.

Abstract: There is provided a predominantly open-cell polyurethane foam obtained from a predominantly open-cell polyurethane foam-forming reaction medium which comprises: a) at least one polyol; b) at least one polyisocyanate; c) at least one catalyst; d) water; e) a predominantly open-cell polyurethane foam-forming amount of at least one surfactant which is a balanced, substantially linear polyether-polysiloxane ABA? block copolymer; and, f) optionally, at least one additional component selected from the group consisting of other polymer and/or copolymer, chain extender, crosslinker, non-aqueous blowing agent, filler, reinforcement, pigment, tint, dye, colorant, flame retardant, antioxidant, antiozonant, UV stabilizer, anti-static agent, biocide and biostat.

Abstract: The regions of interest of images of both breasts of a patient are defined as regions of the image of minimal surface area and containing views of the breasts. These regions of interest are aligned for simultaneous display of the images. The display now allows simple and direct comparison of the images of both breasts, notably allowing immediate comparison of structural disorganizations within the two breasts.

Abstract: A mammography apparatus has an examination arm with a radiation delivery head and an image receiver. The examination arm is mounted for iso-centric rotation in a plane. A support for the arm and a support column on which the support is mounted allow the height of this plane to be adjusted. Patients can be examined in the standing, leaning, sitting or laying position while in each case maintaining the axis of rotation of the examination arm on the axis of the (compressed) breast to be examined.

Abstract: A process for preparing a polyurethane foam is provided which comprises reacting a polyisocyanate and an active hydrogen-containing component, including water and an organic polyol, in the presence of a catalytically effective amount of a delayed action amine catalyst system, and optionally an organotin catalyst. The delayed action catalyst is composed of the reaction product of (a) one or more carboxylic acids having hydroxy and/or halo functionality; (b) one or more tertiary amine ureas; and, optionally, (c) a reactant selected from the group consisting of specific reactive tertiary amine(s), specific tertiary amine carbamate(s) and mixture thereof.

Abstract: A collimator for X-ray apparatus has an aperture defined by the edges of four movable flexible shutters. Each shutter can be moved independently of the other shutters; thus, the position and the size of the aperture can be adjusted at will. The shutters are moved by winding them onto drums; each drum is driven by a stepping motor. Springs bias the shutters towards the closed position of the collimator.

Abstract: A process for preparing a polyurethane foam is provided which comprises reacting a polyisocyanate and an active hydrogen-containing component, e.g.

Abstract: A method of estimating an asymmetrical scatter signal distribution wherein asymmetry is introduced by angular incidence of radiation, which has been emitted from a source and transmitted through an object to be imaged, on a detector, is disclosed. This method includes, in an embodiment, modifying scatter that would be derived wherein the radiation is directly incident on the detector with zero degrees of inclination, using an asymmetry factor which indicates the shape and magnitude of the scatter signal distribution and which varies with an angle at which the radiation is incident on the detector, a mean attenuation coefficient of the object, and a distance the radiation has traveled through the object. The estimated scatter provides for correction of scatter in a image.

Abstract: A process for preparing a polyurethane foam is provided which comprises reacting a polyisocyanate and an active hydrogen-containing component, including water and an organic polyol, in the presence of a catalytically effective amount of a delayed action amine catalyst system, and optionally an organotin catalyst.

Abstract: A process for preparing a polyurethane foam, especially according to the one-shot foaming process the quasi-prepolymer process and the prepolymer process, by reactions between a polyisocyanate and an active hydrogen-containing component including water and an organic polyol wherein said reactions are conducted in the presence of a reaction product formed by reaction between a tertiary amnine and an aryloxy substituted carboxylic acid.