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545 results on '"Firsov, V. A."'

12. Vibration of the Plate with Integral Layer Damping: Experimental and Theoretical Studies

Author

Paimushin, V. N., Firsov, V. A., Shishkin, V. M., Gazizullin, R. K., Correia, José A. F. O., Series Editor, De Jesus, Abílio M. P., Series Editor, Ayatollahi, Majid Reza, Advisory Editor, Berto, Filippo, Advisory Editor, Fernández-Canteli, Alfonso, Advisory Editor, Hebdon, Matthew, Advisory Editor, Kotousov, Andrei, Advisory Editor, Lesiuk, Grzegorz, Advisory Editor, Murakami, Yukitaka, Advisory Editor, Carvalho, Hermes, Advisory Editor, Zhu, Shun-Peng, Advisory Editor, Bordas, Stéphane, Advisory Editor, Fantuzzi, Nicholas, Advisory Editor, Gdoutos, Emmanuel, editor, and Konsta-Gdoutos, Maria, editor

Published
2020
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16. Study of the laminas’ stress-strain state for cross-ply composites with the [± 45°]2s lay-up: tensile tests

Author

Paimushin V., Firsov V., and Gazizullin R.

Subjects
Environmental sciences, GE1-350
Abstract

In this paper we have analysed the relations that allows one to determine the components of strains and stresses in the orthotropic axes of layered fiber reinforced composite materials in tensile and compression experiments for test specimens with the [±45°]2s lay-up. In particular, such relations were compiled on the assumption that in a cross-ply fiber composite two adjacent layers with the [±φ] lay-ups can be considered as one symmetrically reinforced layer with orthotropic properties. To establish the degree of accuracy of these relationships and assumptions, numerical experiments were carried out to determine the parameters of the stress-strain state of specimens consisting of two and four monolayers of a unidirectional fibrous composite material with the [±45°]2s lay-up. The analysis has been performed in the ANSYS finite element analysis program system in a linear formulation of two- and three-dimensional problems. It is shown that in the central zone of the specimen, the theoretical-experimental methodology based on the above mentioned relations has a sufficient degree of accuracy. Based on the analysis of results of three-dimensional problems, the formation of a linear torque in the specimen, which causes the twisting of some zones of the specimen along its length, has been revealed.

Published
2023
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22. Autler–Townes Effect of Autoionization Transition at Laser Separation of Lutetium Isotopes.

Author

D'yachkov, A. B., Gorkunov, A. A., Kovalevich, S. K., Labozin, A. V., Firsov, V. A., Fomichev, S. V., Tsvetkov, G. O., and Panchenko, V. Ya.

Subjects
ISOTOPE separation, SQUARE root, LUTETIUM, PHOTOIONIZATION, LASERS
Abstract

The splitting of the transition from a discrete to an autoionization state, used in a three-step photoionization scheme of lutetium 5d6s2 2D3/2–5d6s6p –5d6s7s 4D3/2–(53375 cm–1) has been studied. The splitting is proportional to the square root of the intensity, which corresponds to the Autler–Townes effect. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Study of the Photoionization Spectrum in the Second Step of the Lutetium Photoionization Scheme.

Author

D'yachkov, A. B., Gorkunov, A. A., Labozin, A. V., Mironov, S. M., Firsov, V. A., Tsvetkov, G. O., and Panchenko, V. Ya.

Abstract

The photoionization spectrum in the second step of the three-step lutetium photoionization scheme 5d6s2 2D3/2 – 5d6s6p4 – 5d6s7s4D3/2 – (53 375 cm–1 has been measured. The effect of two-photon transitions has been studied experimentally compared to one-photon transitions. [ABSTRACT FROM AUTHOR]

Published
2023
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44. Electromagnetic Acceleration of Laser-Induced Plasma.

Author

D'yachkov, A. B., Gorkunov, A. A., Kovalevich, S. K., Labozin, A. V., Mironov, S. M., Firsov, V. A., Tsvetkov, G. O., and Panchenko, V. Ya.

Subjects
LASER plasmas, PLASMA acceleration, LASER pumping, LASER beams, PULSED lasers, LASER pulses, ISOTOPE separation, DYE lasers
Abstract

Acceleration of laser-induced plasma created as a result of three-step photoionization of atomic vapor by pulsed radiation of dye lasers pumped by copper-vapor lasers is studied experimentally. The acceleration was achieved due to the alternating magnetic field appearing upon propagation of a current pulse through an inductor located in direct proximity from the area of laser protoionization of atomic lutetium vapor. [ABSTRACT FROM AUTHOR]

Published
2023
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