Abstract: In a Laval nozzle (10) having a flow channel (12), which has a flow cross-section (14) extending in a convergent-divergent manner, according to the invention the flow channel (12) comprises mutually opposing first flow channel walls (16, 16?), which are formed by two nozzle bodies (18, 18?) spaced a fixed distance apart from one another. Two mutually opposite second flow channel walls (20, 20?), which can be moved relative toward one another or away from one another for adjusting the flow cross-section (14) of the flow channel (12), are disposed between the nozzle bodies (18, 18?).

Abstract: The invention relates to a steam turbine (10), in particular for using the waste heat of an internal combustion engine (2), comprising at least one rotor (26) and at least one stator (20), said stator (20) comprising at least two nozzles (22) which are arranged in parallel in relation to each other. The nozzles (22) are designed for different load points of the rotor (26) and can be switched on and off independently from each other.

Abstract: A brake disc for a disk brake of a motor vehicle is made of cast iron and lamellar graphite. The graphite is removed from open cavities of the cast iron, e.g., by an ultrasound treatment, in order to improve an adhesion of a thermal powder coating subsequently applied on friction surfaces of the brake disk.

Abstract: A thermoelectric generator and a method for manufacturing a thermoelectric generator are described. The thermoelectric generator, having a housing in which at least one heat source tube, at least one heat sink tube, and at least one generator element are between the heat source tube and the heat sink tube. A pretension mounting device is in the housing and provides an elastic force via which the tubes are pretensioned relative to one another and which compresses the tubes and the generator element in-between. An inner side of the housing of the pretension mounting device forms a support for the pretension mounting device, which is acted upon by a counterforce to the elastic force of the pretension mounting device.

Abstract: In a Laval nozzle (10) having a flow channel (12), which has a flow cross-section (14) extending in a convergent-divergent manner, according to the invention the flow channel (12) comprises mutually opposing first flow channel walls (16, 16?), which are formed by two nozzle bodies (18, 18?) spaced a fixed distance apart from one another. Two mutually opposite second flow channel walls (20, 20?), which can be moved relative toward one another or away from one another for adjusting the flow cross-section (14) of the flow channel (12), are disposed between the nozzle bodies (18, 18?).

Abstract: A heat exchanger for thermoelectric generators having at least two channels for a cooling medium and at least one channel for a heating medium, the at least one channel for the heating medium being equipped with ribs in the inner region. These ribs are mounted at a number of ribs that increases in the heating flow direction which, among other things, contributes to a more efficient utilization and a comparability of the heat flow.