Grigoriev S.N., Kozochkin M.P., Volosova M.A., Okunkova A.A. «Acoustic monitoring of laser pulses in processing of metal-ceramic hard alloy» Контроль. Диагностика, 27, № 12, с. 33-41 (2024)

This work is devoted to studying the relationship between the factors of processing with laser pulses of T15K6 hard alloy, the parameters of acoustic emission, and process productivity. The laser source was a pulsed fiber laser with a wavelength of 1064 nm, a power of 20 to 60 W, and pulse duration of 250 to 500 ns. The main dependencies for the lower and upper frequency ranges (10–28 kHz and 32–70 kHz) were plotted. Acoustic emission signals provide insight into the effects of concentrated energy flows on material and can be used to understand hard-to-observe phenomena and ongoing processing performancence. Keywords: vibroacoustic emission, laser processing, control, productivity, cutting insert, spectral analysis, hard alloy T15K6.

Volovik G.E. «Schwinger vs Unruh» Письма в ЖЭТФ, 120, № 9, с. 659-660 (2024)

It is shown that the temperatures which characterise the Unruh effect, the Gibbons–Hawking radiation from the de Sitter cosmological horizon and the Hawking radiation from the black hole horizon acquire the extra factor 2 compared with their traditional values. The reason for that is the coherence of different processes. The combination of the coherent processes also allows us to make the connection between the Schwinger pair production and the Unruh effect.

Volovik G.E. «Tsallis–Cirto entropy of black hole and black hole atom» Письма в ЖЭТФ, 121, № 4, с. 260-262 (2025)

DOI: https://doi.org/10.31857/S0370274X25020158