Provided is a technology capable of suppressing a reduction in electron mobility in a channel region formed in a strained silicon layer. Each member of the set has at least one electric feed-in block, which is connectable to the locally available system voltage and from this generates an output voltage, which is the same for all members of the set and is lower than or equal to the lowest system voltage, for which a member of the set is designed. It relates more particularly to a turbomachine inner casing 21 comprising a plurality of annular shrouds 23 that are provided with flanges 24 for joining two adjacent shrouds 23 together. The method also utilizes surplus torque available to the motor during a trip to produce an optimized velocity profile that has a short trip time, yet does not exceed the torque deliverable by the motor and does not exceed acceptable discomfort levels to the passengers or mechanical limitations on the system. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.