Valentyn Skalskyi was born in Rivne region, Ukraine, on June 25, 1954. He was studied radio engineering at the Lviv Polytechnic Institute (1978). He received the Candidate of Sc. (PhD) and Doctor of Sc. (DSc) Degrees from the Karpenko Physico-Mechanical Institute of the NAS of Ukraine in 1993 and 2003 respectively, both in mechanics of a deformable solid. He holds the State scientific grades of professor (2009) in diagnosis of materials and constructions.Since 1980, Prof. Skalskyi is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences (NAS) of Ukraine. He holds the positions of Vice-Director of this Institute since 2015. Also, since March 2015 he is the Member of the NAS of Ukraine.His research interests include fracture mechanics, technical diagnostic and nondestructive testing and development of systems of digital signal processing. He has over 500 publications (34 books including) in scientific journals and conferenceproceedings. Currently he is the editorial-board member of the international journal Materials Science.Prof. Skalskyi is Honored Worker in Science and Engineering of Ukraine, holds the State Prize of Ukraine for Science and Engineering and two NASU Prizes for works for NDT methodology and its application based on acoustic emission. Zinoviy Nazarchuk was born in Lviv, Ukraine, in 1952. He received the Candidate of Sc. (PhD) and Doctor of Sc. Degrees from Kharkiv State University in 1982 and 1990 respectively, both in radio science. He holds the State scientific grades of senior researcher (1988) and professor (1998) in theoretical and mathematical physics.Since 1976, Prof. Nazarchuk is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine (NASU). He holds the positions of Vice-Director (1991-2014) and Director (since 2015) of this Institute. Also, since 2007 he is the member of the Presidium of NASU and head of the Western Scientific Center of NASU and Ministry of Education and Science of Ukraine.Prof. Nazarchuk is Member of NASU (since 2006). He works in the field of material science, theoretical radio physics and mathematical modelling. His principal area of research is the waves theory and applied mathematics. He has more than 370 publications (15 books including) in the field of the theory of material diagnostics, non-destructive testing, and numerical electromagnetics. Currently he is the editor-in-chief of the international journal Materials Science and the periodical interbranch collection of scientific papers Information Extraction and Processing.Prof. Nazarchuk is Honored Worker in Science and Engineering of Ukraine, holds the State Prize of Ukraine for Science and Engineering and three NASU Prizes for works in the theory of physical fields and for NDT methodology and its application based onacoustic emission.Olena Stankevych was born in Lviv, Ukraine, in 1970. She was studied applied mathematics at the Lviv Polytechnic Institute (1992). She received the Candidate of Sc. (PhD) and Doctor of Sc. (DSc) Degrees from the Karpenko Physico-Mechanical Institute of the NAS of Ukraine in 2012 and 2019 respectively, both in diagnosis of materials and constructions. He holds the State scientific grades of senior researcher (2016) in diagnosis of materials and constructions.Since 2010, DSc Stankevych is with the Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine (NASU). She holds the positions from Junior Researcher (2010) to Leading Researcher (since 2020) of this Institute.Her research focuses on wave propagation and vibrations in solids with cracks. She is interested in both basic research and applications in nondestructive testing and digital signal processing. She has over 80 publications in scientific journals and conference proceedings.

• Macrofracture of Structural Materials and Methods of Determining its Type.- Mathematical Models for Displacement Fields Caused by the Crack in an Elastic Half-Space.- Energy Criterion for Identification of the Types of Material Macrofracture.- Evaluation of the Types and Mechanisms of Fracture of Composite Materials According to Energy Criteria.- Ranking of Dental Materials and Orthopedic Constructions by their Tendency to Fracture.- Rating of Hydrogen Damaging of Steels by Wavelet Transform of Magnetoelastic Acoustic Emission Signals.