TEXT Mariya Vyacheslavovna Vechkanova1, Yuriy Mikhailovich Fadin1, Yuriy Grigorevich Ovsyannikov1,
Vasiliy Stepanovich Bogdanov1, Stefan Vöth2
1Belgorod State Technological University Vladimir Shukhov, Belgorod/Russia
2Technische Hochschule Georg Agricola, Bochum/Germany
