Abstract: A tracker for a surgical navigation system, a tracker system, and a surgical navigation system are provided. The tracker comprises a carrier and an electrical circuit disposed on the carrier. The electrical circuit comprises at least one infrared light emitting diode, IR-LED, and a battery or a wireless power reception device configured to receive power wirelessly, wherein the battery or the wireless power reception device is configured to provide power to operate the at least one IR-LED. The electrical circuit is configured to limit a current for at least one of the at least one IR-LED to not exceed 15 mA.

Abstract: Thus there is provided a method of installing rotor blades of a wind turbine to a rotor hub of the wind turbine. The wind turbine has a tower having a tower longitudinal axis. The rotor hub has a first, a second and a third rotor blade connection. The rotor hub is rotated until the first rotor blade connection is at an angle of 90° or 270° with respect to the tower longitudinal axis. The first rotor blade is lifted substantially horizontally and fixed to the rotor blade connection. The rotor hub is rotated so that the second rotor blade connection is at an angle of 90° or 270° with respect to the tower longitudinal axis. The second rotor blade is lifted substantially horizontally and fixed to the second rotor blade connection. The rotor hub is further rotated until the third rotor blade connection is at an angle of 60° or 300° with respect to the tower longitudinal axis. The third rotor blade is lifted at an angle of ?=30° with respect to a horizontal and fixed to the third rotor blade connection.

Abstract: A method for preprocessing data records for rendering in a diagram having first, second and third coordinates, wherein values of the first coordinate of the diagram, and/or values of the second coordinate of the diagram are discretized in bins. The method includes assigning to each bin of the first coordinate or to each bin of the second coordinate, data records having a value of the first coordinate or values of the first coordinate and the second coordinate, checking a number of data records that is assigned to each bin; when only one data record is assigned to a bin, instructing rendering the diagram using a third coordinate value of the data record, and when multiple data records are assigned to a bin, instructing rendering the diagram using selected third coordinate values, determined according to a predetermined criterion in which at least one value is chosen and/or aggregated.

Abstract: A method for preprocessing data records for rendering in a diagram having a first coordinate, a second coordinate and a third coordinate, wherein values of the first coordinate of the diagram, and/or values of the second coordinate of the diagram are discretized in bins. The method includes assigning to each bin of the first coordinate or to each bin of the second coordinate, data records having a value of the first coordinate or values of the first coordinate and the second coordinate, checking a number of data records that is assigned to each bin; when only one data record is assigned to a bin, instructing rendering the diagram using a third coordinate value of the data record, and when multiple data records are assigned to a bin, instructing rendering the diagram using selected third coordinate values, determined according to a predetermined criterion in which at least one value is chosen and/or aggregated.

Abstract: A coaxial probe is for a time-domain reflectometry fill level measurement device. The internal conductor of which is tensioned against the external conductor using a tension element. The tension element is in the form of a disc for example, and includes an internal thread which is screwed onto an external thread on the end of the internal conductor. Thus, the number of spacers can be reduced.

Abstract: A coaxial probe is for a time-domain reflectometry fill level measurement device. The internal conductor of which is tensioned against the external conductor using a tension element. The tension element is in the form of a disc for example, and includes an internal thread which is screwed onto an external thread on the end of the internal conductor. Thus, the number of spacers can be reduced.