The present invention relates to a compounds of formula Iwherein R1, R2, Ar1, Ar2, R\u2032, R\u2033, m, n, and o are defined in the specification or to a pharmaceutically active salt, racemic mixture, enantiomer, optical isomer or to tautomeric form thereof. The torque generator generates a torque that counters a reactive torque when a drill bit of the bottom-hole assembly is driven. A function-based object model identifies objects associated with a website, and analyzes those objects in terms of their functions. The number ranking feature is transformed into a static input value. A computer program executes a self-tuning routine to compute the operating frequency and operating power setting for the forge welding machine in response to an inputted width of the heat affected zone and an inputted weld temperature.