The Invention relates to compounds of the formula I, wherein the variables are as defined in the claims, for use as a medicament. In some embodiments, the apparatus includes a sonotrode and an ultrasound transducer operative to induce longitudinal andor transversal ultrasound vibrations in a least a portion of the sonotrode. In addition, the system has a turbine that is driven by the fluid configured to convert at least a portion of the thermal energy to mechanical energy. The cursor control panel also is used for reconfiguring the display configuration for each phase of flight. An amplitude corrected sine component ) is obtained by dividing the sine component ) by the amplitude correction factor. Assembled, the valve part is initially disposed about the post in a compressive sealed relationship to form a secure pathway therebetween.