Abstract: A tribosystem for radial and axial foil bearings includes a first structural component part; and a second structural component part interacting with the first part. The first and second parts are in a dry frictional unidirectional sliding contact with one another until an air film is formed. A surface of at least one of the first and second parts being exposed to the dry frictional contact contains at least partly at least one of a metallic bound (Ti,Mo)(C,N), Tin-2Cr2O2n-1 with 6?n?9 and solid solution of TiO2—Cr2O3.

Abstract: A method and a device for detecting discontinuities in a material region having at least one probe which has a plurality of ultrasonic transducer elements and having an evaluation and control device are proposed, in which the transducer elements are disposed diagonally at an angle to the surface of the material region and are actuated via delay elements in such a manner that a defocusing sound field is beamed in. The received signals of the transducer elements are supplied to a plurality of evaluation modules for parallel and simultaneous further processing for different angle values or angle ranges, the number of evaluation modules corresponding to the different angle values or ranges.

Abstract: Described is a method for operating a positioning vehicle for positioning a test probe in defined intervals along a travel line, as well as to a positioning vehicle for carrying out the method. The positioning vehicle contains a traveling vehicle base part with a guide device and with a test probe carrier guided by this guide device in a guide. The guiding has a first reversal point and a second reversal point. The guide device comprises guide means in order on displacing the vehicle base part to guide the test probe carrier in the travel direction up to the first reversal point after it has reached the second reversal point, and in order to lead back the test probe carrier opposite to the travel direction up to the second reversal point after it has reached the first reversal point. In the phase of the return, the test probe carrier relative to the vehicle base part has the negative speed of the vehicle base part.