Abstract: Apparatuses, systems, and methods comprising acoustically absorptive air ducts comprising an internally positioned structure component as an endoskeleton and an air impervious inner layer, and an acoustically absorptive foam outer layer, environmental control systems comprising such air ducts, and vehicles incorporating such environmental control systems are disclosed with methods for manufacture and installations are disclosed.

Abstract: A method is provided for passivating an aluminum surface. According to the method, the aluminum surface is provided with a flux. A passivation solution is subsequently applied to the aluminum surface, such that a passivation layer is created by reaction of the passivation solution with the aluminum surface, which is provided with the flux.

Abstract: A heat exchanger, in particular a heat exchanger of a motor vehicle, having cooling pipes and having collecting tanks, in which heat exchanger the cooling pipes extend between the collecting tanks, in which heat exchanger the cooling pipes and the collecting tanks are spatially connected to one another, in which heat exchanger the cooling pipes are produced from a strip material with at least one cooling pipe seam, in which heat exchanger the at least one cooling pipe seam forms an inner partition of the cooling pipe, and in which heat exchanger the cooling pipes have an external solder plating on the pipe outer side and the cooling pipes have more than one coating on the pipe inner side, wherein one of the coatings on the pipe inner side is arranged only partially in the region of the at least one cooling pipe seam, as a result of which particularly high demands with regard to a multi-coating layered construction of cooling pipes of the heat exchanger can be met in a cost-effective manner.

Abstract: A method for quantitatively determining flux material residues remaining on a heat exchanger after a preceding soldering process is provided. To this end, a fluid is applied to the heat exchanger, wherein the remaining quantity of flux material on the heat exchanger after the preceding soldering process is derived from the concentration of soldering agent in the fluid.

Abstract: A method for quantitatively determining flux material residues remaining on a heat exchanger after a preceding soldering process is provided. To this end, a fluid is applied to the heat exchanger, wherein the remaining quantity of flux material on the heat exchanger after the preceding soldering process is derived from the concentration of soldering agent in the fluid.

Abstract: A heat exchanger, in particular a heat exchanger of a motor vehicle, having cooling pipes and having collecting tanks, in which heat exchanger the cooling pipes extend between the collecting tanks, in which heat exchanger the cooling pipes and the collecting tanks are spatially connected to one another, in which heat exchanger the cooling pipes are produced from a strip material with at least one cooling pipe seam, in which heat exchanger the at least one cooling pipe seam forms an inner partition of the cooling pipe, and in which heat exchanger the cooling pipes have an external solder plating on the pipe outer side and the cooling pipes have more than one coating on the pipe inner side, wherein one of the coatings on the pipe inner side is arranged only partially in the region of the at least one cooling pipe seam, as a result of which particularly high demands with regard to a multi-coating layered construction of cooling pipes of the heat exchanger can be met in a cost-effective manner.

Abstract: The invention relates to an ECG system for the large-surface measurement of ECG signals which is characterized by a first measuring device (10) for generating a first set of readings comprising at least one derivation of the electrical impulses of the heart. At least one site of derivation of the first measuring device (10) during recording of the large-surface ECG signals is variable. The system further comprises a second measuring device (20) for generating a second set of readings comprising at least one derivation of the electrical impulses of the heart. The site of derivation of the second measuring device (20) during recording of the large-surface ECG signals is spatially invariable in order to obtain continuous readings. A data processing system (30) is provided with means for synchronizing at least two signals of the first set of readings that are detected at different times with at least one continuously detected signal of the second set of readings.

Abstract: An apparatus for the qualitative and/or quantitative measurement of analytes, in particular in biological samples by means of receptor ligand binding and having a magnetizing device for the production of a magnetic field at the location of the sample and with a detection device for measurement of magnetic properties of the sample is characterized in that the magnetizing device is spatially disposed with respect to the detection device in such a fashion that the magnetic field produced by the magnetization device at the location of the magnetization is attenuated by at least a factor of 10, and preferentially by a factor of 1000 or more, at the location occupied by the sample during the measurement, or in that a switching device is provided for which, throughout a predetermined time duration and in particular during the measurement phase of the detection device can switch-off the magnetic field of the magnetizing device at the location of the sample.

Abstract: In a method for the operation of a power station installation which essentially comprises a compressor (4), a combustion unit and a turbine (12), the combustion unit comprising a conditioning stage for at least part of the combustion air and a combustion chamber, a portion (13a) of the compressed air (13) from the compressor (4) is passed through the conditioning stage and there first of all mixed with a quantity of fuel (14a). This mixture then passes into a generator (8), in which at least hydrogen is fractionated, this hydrogen then being used in the combustion chamber. The combustion chamber comprises a start-up burner (1), a catalytic stage (2) and a downstream second combustion stage (3). Both the air/fuel mixture (16a) fractionated in the generator (8) and the further compressor air (13) enter the combustion chamber, in which interdependent combustion occurs between the combustion units acting there, relative to the running up of the installation, for the purpose of minimizing pollutant emissions.

Abstract: In the combustion chamber of a gas turbine, an air distribution chamber (19) and a combustion space (7) are locationally separated from one another within the combustion chamber shell (1). A multiplicity of tubular elements (2) are located between the distibution chamber and the combustion space, in which elements a premixing and pre-evaporation of the fuel oil supplied via the premixing nozzles (15') and/or a premixing of the fuel gas supplied through the premixing nozzles (15") takes place with compressor air. Each tubular element (2) is provided with a flameholder (3) in the direction towards the combustion space (7). A diffusion nozzle (8) for fuel directed into the combustion space (7) is located within the flameholder. In operation on load, only a small part of the fuel supplied to each element (2) is burned by means of the diffusion nozzle (8), the major proportion, on the other hand, being burnt by means of the premixing nozzles (15' of 15").

Abstract: A combustion chamber for a gas turbine which is equipped with a number of tubular-shaped elements, within which there occurs between the fuel and the compressed air a pre-mixing/pre-evaporation process. Each tubular element is closed at its end at the side of its combustion space by a flame baffle provided with one or a number of openings, so that the combustion first can occur downstream of the flame baffle, whereby there is appreciably reduced the emissivity of noxious substances from the combustion process.

Abstract: The system has a plurality of small primary combustion chambers which lead into a larger secondary combustion chamber in order to reduce the amount of nitrous oxides produced during combustion and thus, lower, pollution. The primary combustion chambers are arrayed in a spherical pattern to eliminate the need for individual ignition devices and to provide a better mixing effect and a more uniform temperature distribution within the secondary combustion chamber.