Abstract: A device for acoustic detection of an electric arc, including a tubular probe suitable for being arranged next to a piece of electrical equipment on which an electric arc is likely to form. An interior space, circumscribed by a wall of the probe, extends along the length of the probe. This interior space is filled with a fluid and acoustically isolated from external noise by the wall. The probe includes, at the periphery of its interior space, on its wall, at least one vulnerable zone suitable for degrading under the effect of the electric arc, revealing a passage to the interior space for an acoustic wave generated by the electric arc. The device further includes at least one acoustic sensor suitable for detecting the acoustic wave that travelled through the passage and propagated in the interior space of the probe.

Abstract: A device for acoustic detection of an electric arc, including a tubular probe suitable for being arranged next to a piece of electrical equipment on which an electric arc is likely to form. An interior space, circumscribed by a wall of the probe, extends along the length of the probe. This interior space is filled with a fluid and acoustically isolated from external noise by the wall. The probe includes, at the periphery of its interior space, on its wall, at least one vulnerable zone suitable for degrading under the effect of the electric arc, revealing a passage to the interior space for an acoustic wave generated by the electric arc. The device further includes at least one acoustic sensor suitable for detecting the acoustic wave that travelled through the passage and propagated in the interior space of the probe.

Abstract: A reciprocating welding device using a microcontroller to control a stepper motor to control a welding head for the stationary welding of a workpiece, the microcontroller allowing for adjustment of the welding head reciprocating stroke speed, the width of each stroke, and a pause from 0-1 second at the sides to control the wash of the welding edges, having a manipulator, the welding head and the oscillator contained in a single unit and provided on a multiple adjustment portable stand.

Abstract: A surface liner member includes an external wall which is provided with multiple holes, a spacer structure, and tubes which are respectively associated with the holes in the external wall. The surface liner member is intended to be applied to a base surface in order to reduce, by acoustic absorption, an acoustic wave reflected on this base surface. The acoustic absorption efficiency is improved, particularly for frequencies below 500 Hz, by varying the shape of the holes in the external wall such that the ratio of the hole perimeter to the hole area varies. Such a surface liner member may be adapted to form a surface portion of an aircraft engine nacelle, or of a leading edge of an aircraft wing.

Abstract: A beam homogenizer for transforming a beam of laser-radiation into a flat-top intensity distribution having brighter or darker edges comprises a first lens array, a second lens array, and a positive lens. The first lens array includes a plurality of lens elements that are separated by gaps having no optical power. Brighter or darker edges are produced by selecting a distance between the first and second lens arrays that is less than or greater than the focal length of lens elements in the second lens array.

Abstract: A beam homogenizer for transforming a beam of laser-radiation into a flat-top intensity distribution having brighter or darker edges comprises a first lens array, a second lens array, and a positive lens. The first lens array includes a plurality of lens elements that are separated by gaps having no optical power. Brighter or darker edges are produced by selecting a distance between the first and second lens arrays that is less than or greater than the focal length of lens elements in the second lens array.

Abstract: A surface liner member includes an external wall which is provided with multiple holes, a spacer structure, and tubes which are respectively associated with the holes in the external wall. The surface liner member is intended to be applied to a base surface in order to reduce, by acoustic absorption, an acoustic wave reflected on this base surface. The acoustic absorption efficiency is improved, particularly for frequencies below 500 Hz, by varying the shape of the holes in the external wall such that the ratio of the hole perimeter to the hole area varies. Such a surface liner member may be adapted to form a surface portion of an aircraft engine nacelle, or of a leading edge of an aircraft wing.

Abstract: A reciprocating welding device using a microcontroller to control a stepper motor to control a welding head for the stationary welding of a workpiece, the microcontroller allowing for adjustment of the welding head reciprocating stroke speed, the width of each stroke, and a pause from 0-1 second at the sides to control the wash of the welding edges, having a manipulator, the welding head and the oscillator contained in a single unit and provided on a multiple adjustment portable stand.

Abstract: A device for the verification of the integrity of a train of vehicles. In order to verify the integrity reliably and with little complexity, the device has a first communication device and is configured to transport the first communication device autonomously to a designated end of the train of vehicles.

Abstract: In a laser line projection apparatus, six spaced-apart unpolarized laser-beams are plane-polarized with low loss by a combination of a thin-film polarizer, a reflector, and two polarization rotators. Two beams are polarized in each of three polarization-orientations. Two of the polarization-orientations are orthogonally aligned with each other in P and S orientations. The other polarization-orientation is non-orthogonally aligned in an intermediate orientation. The beams are intensity-homogenized and projected into a line of radiation. Any point on the line of radiation is formed from rays with an angular distribution of polarization-orientation from S to P through the intermediate orientation and back to S through the intermediate orientation.

Abstract: A train safety assembly has an onboard apparatus of a first train safety system and a specific transmission device for transmission with a trackside part of a second train safety system. The onboard apparatus is started using a version of a first software and the specific transmission device is started using a version of a second software. The versions of the first and second software are checked for their compatibility. In order to be able to provide the train safety assembly for use on a track section, which is equipped with the trackside part of the second train safety system, and to put same into operation in a faster and more cost-efficient manner, if the started versions of the first and second software are incompatible, the transmission device is automatically restarted with another version of the second software, and the started first and second software are checked for their compatibility.

Abstract: A train safety assembly has an onboard apparatus of a first train safety system and a specific transmission device for transmission with a trackside part of a second train safety system. The onboard apparatus is started using a version of a first software and the specific transmission device is started using a version of a second software. The versions of the first and second software are checked for their compatibility. In order to be able to provide the train safety assembly for use on a track section, which is equipped with the trackside part of the second train safety system, and to put same into operation in a faster and more cost-efficient manner, if the started versions of the first and second software are incompatible, the transmission device is automatically restarted with another version of the second software, and the started first and second software are checked for their compatibility.

Abstract: A soundproof panel has a sandwich structure, which includes two outer walls, a core, and modifying elements that are maintained in a fractal distribution by the core. The panel has an improved trade-off between sound attenuation efficiency and the weight of the panel.

Abstract: A soundproof panel has a sandwich structure, which includes two outer walls, a core, and modifying elements that are maintained in a fractal distribution by the core. The panel has an improved trade-off between sound attenuation efficiency and the weight of the panel.

Abstract: In a laser line projection apparatus, six spaced-apart unpolarized laser-beams are plane-polarized with low loss by a combination of a thin-film polarizer, a reflector, and two polarization rotators. Two beams are polarized in each of three polarization-orientations. Two of the polarization-orientations are orthogonally aligned with each other in P and S orientations. The other polarization-orientation is non-orthogonally aligned in an intermediate orientation. The beams are intensity-homogenized and projected into a line of radiation. Any point on the line of radiation is formed from rays with an angular distribution of polarization-orientation from S to P through the intermediate orientation and back to S through the intermediate orientation.

Abstract: A rail vehicle includes at least one train protection device according to a national standard, an ETCS vehicle apparatus with a driver's cab display, and an interface for inputting operational data via the interface for the at least one train protection device. In order to make such a rail vehicle maintenance-friendly, the train protection device is embodied in such a way that an interrogation of an identification code is generated on the driver's cab display within the scope of the inputting of the operational data, and when the response to the interrogation is correct a data interrogation with technical maintenance data is generated on the driver's cab display. A method for operating the rail vehicle is also provided.

Abstract: A method of making tuna salad with improved storage and organoleptic properties by retorting precooked tuna to an internal temperature of at least 100° C. for at least one minute, cooling the retorted tuna and combining the retorted with other appropriate ingredients for making tuna salad while maintaining the tuna and other ingredients at a temperature of ?1° C. to 4.4° C.

Abstract: Apparatus for homogenizing and projecting two laser-beams is arranged such that the projected homogenized beams are aligned parallel to each other in a first transverse axis and partially overlap in second transverse axis perpendicular to the first transverse axis. The projected homogenized laser-beams have different intensities in the second axis and the degree of partial overlap is selected such that the combined intensity of the laser beams in the second axis has a step profile.

Abstract: Apparatus for homogenizing and projecting two laser-beams is arranged such that the projected homogenized beams are aligned parallel to each other in a first transverse axis and partially overlap in second transverse axis perpendicular to the first transverse axis. The projected homogenized laser-beams have different intensities in the second axis and the degree of partial overlap is selected such that the combined intensity of the laser beams in the second axis has a step profile.

Abstract: The invention refers to the fields of chemistry and mechanical engineering, relates to a permanent coating, which have a functionalization of the surfaces for the avoidance or reduction of ice growth on this surface. The object of the present solution is to disclose a permanent coating that is durable and reliably inhibits and/or prevents an icing of the surface. The object is attained through a permanent coating of surfaces for inhibiting and/or preventing icing down to ambient temperatures of ?10° C., in which the coating comprises polymers with main chains and side chains, wherein the polymer main chains are hydrophobic and the side chains are hydrophilic and the polymer main chains have entered into a chemical and/or chemically-coordinative and/or physical interaction with the surface to be coated and the side chains are arranged on the polymer main chain essentially in the direction away from the surface and at least do not permanently interact with one another.