should drive on two wheels, similar to a Segway. They planned to overcome the stairs with caterpillars that can be extended and retracted. The wheelchair, Scalevo, unites the two motion principles into one "hybrid" chair.

Testing Scalevo
The wheelchair user approaches stairs and selects the appropriate function on the touch screen. With sensors and cameras, the chair measures the incline of the stairs and automatically drives up to them in reverse. The caterpillars lower, and they start to turn and move the wheelchair up the stairs, with speeds of one step per second. The driver stays in a straight position the entire time, then as soon as the sensors detect the end of the stairs, the stabilizing wheels move into position, preventing the wheelchair from tipping over. The caterpillars thenModern gas or combustion turbines must satisfy the highest demands with respect to reliability, weight, power, economy, and operating service life. In the development of such turbines, the material selection, the search for new suitable materials, as well as the search for new production methods, among other things, play an important role in meeting standards and satisfying the demand.
The materials used for gas turbines may include titanium alloys, nickel alloys (also called super alloys) and high strength steels. For aircraft engines, titanium alloys are generally used for compressor parts, nickel alloys are suitable for the hot parts of the aircraft engine, and the high strength steels are used, for example, for compressor housings and turbine housings. The highly loaded or stressed gas turbine components, such as components for