Contents

Russian Journal of Nondestructive Testing

Vol. 57, No. 11, 2021

Acoustic Methods

Determining Geometric-Acoustic Properties of a Weld as a Solution to the Inverse Coefficient Problem for a Scalar Wave Equation

E. G. Bazulin, A. V. Goncharskii, S. Yu. Romanov and S. Yu. Seryozhnikov p. 933  abstract

Increasing Rate of Recording of Echo Signals with Ultrasonic Antenna Array using Optimum Sparsing of Switching Matrix with a Genetic Algorithm

E. G. Bazulin and L. V. Medvedev p. 945  abstract

Modernizing the Echo Method of Ultrasonic Flaw Detection

V. G. Kartashev, E. I. Trunov, E. V. Shalimova and R. V. Kontsov p. 953  abstract

Developing a Method for Ultrasonic Quality Control of Plastic Products Obtained by Rotary Moulding Method

R. S. Gaisin, V. Yu. Tyukanko and A. V. Demyanenko p. 962  abstract

Study on Ultrasonic Propagation Path in Nonuniform Temperature Field

Yunxin Wu, Wenlong Zhang, Tao Zhang, Yutang Wu and Xufei Yang p. 968  abstract

Delamination Defects Localization Using a New Time Frequency Algorithm Based on S-Transform for Ultrasonic Testing of Wind Turbine Blades Composite Materials

Ahmed Benyahia, Abdessalem Benammar and Abderrezak Guessoum p. 976  abstract

Study on the Relationship between Bolt Anchoring Defects and Complexity of Nondestructive Testing Signal

Lei Zhang, Zhimin Huang, Long Bai, Zhanguo Ma and Lun Zhang p. 987  abstract

Optical Methods

Technique for Analyzing Volumetric Defects Using Digital Elevation Model of a Surface

A. A. Dedkova, I. V. Florinsky, E. E. Gusev, N. A. Dyuzhev, M. Yu. Fomichev and M. Yu. Shtern p. 1000  abstract

Electromagnetic Methods

Quantitative Nondestructive Testing of Steel Wire Rope Based on Optimized Support Vector Machine

Bing Li, Juwei Zhang and Qihang Chen p. 1008  abstract

Thermal Methods

Infrared Image Segmentation Algorithm Based on Multi Structure Morphology—Pulse Coupled Neural Network in Application to the Inspection of Aerospace Materials

Chiwu Bu, Tao Liu, Rui Li, Bo Zhao and Qingju Tang p. 1018  abstract

Enhanced Subsurface Analysis Using Proper Orthogonal Decomposition in Nonstationary Thermal Wave Imaging

G. T. Vesala, V. S. Ghali, Sk. Subhani and B. Suresh p. 1027  abstract