Персона: Федотов, Сергей Николаевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Сергей Николаевич
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- ПубликацияТолько метаданныеRock damage evolution as failure process of hierarchical structure(2020) Fedotov, S. N.; Федотов, Сергей Николаевич© 2020 Elsevier B.V.The present study is devoted to evolution of rocks in the fracture process. Initially the rock is considered as an ideal medium with no cracks. Rock formation is assumed in the form of a nested self-similar hierarchical structure. The hierarchical structure scheme is chosen in accordance with the experimentally verified criterion of fracture. The failure probability of the lowest structure level represents a function of time, temperature, material parameters and loading conditions. Knowing the failure probabilities of each structure level allows one to calculate the stress dynamics in a rock material, failure volumes for each hierarchy level, energy release, etc. The influence of temperature, type of the hierarchical structure, rock material, stress rate on the fracture dynamics is considered. The results of calculations of the rock fracture dynamics are compared with the results of experiments. This study can be seen as an attempt to explain the stability of the Gutenberg-Richter law.
- ПубликацияТолько метаданныеMethods for obtaining linear energy distribution in a small volume from nuclear fragmentation events caused by space radiation(2021) Fedotov, S. N.; Kushin, V. V.; Федотов, Сергей Николаевич; Кушин, Владимир Васильевич© 2021The microdosimetric approach to the interpretation of nuclear fragmentation events generated by cosmic radiation in near-earth orbits is described. A method is proposed for calculating the linear energy in the interactions of secondary charged fragments with a sensitive volume. All calculations were carried out using dE/dx values obtained in data processing of space experiments. The probability density distributions of linear energy in micro volumes of water for different types of fragmentation events are obtained.
- ПубликацияТолько метаданныеDescription of nuclear fragmentation events induced by space radiation: An analytical approach(2022) Fedotov, S. N.; Kushin, V. V.; Федотов, Сергей Николаевич; Кушин, Владимир Васильевич© 2022 Elsevier B.V.One of the features of the field of space radiation inside a spacecraft during an orbital flight is the presence of a secondary component in its composition. This component is generated in the environment due to nuclear interactions of primary radiation with the walls of the spacecraft, material load, biological objects, electronics, etc. Secondary radiation consists mainly of charged particles of a wide energy range and neutrons. The fluence of secondaries can be non-uniform, especially in the region adjacent to the vertex of the nuclear interaction. In this region, the local energy absorbed in matter can significantly exceed the volume average values. In this paper a calculation method is considered and the probability of large energy transfer in fragmentation events in the vicinity of the nuclear interaction vertex is estimated.
- ПубликацияТолько метаданныеScintillation Crystals Based on Complex Oxides of Group 3 Elements(2020) Grigoryeva, I. G.; Korf, A. N.; Naumov, P. Y.; Salakhutdinov, G. K.; Fedotov, S. N.; Григорьева, Ирина Гаяровна; Корф, Александр Николаевич; Наумов, Петр Юрьевич; Салахутдинов, Гаяр Харисович; Федотов, Сергей Николаевич© 2020, Pleiades Publishing, Ltd.Abstract: Scintillation properties of crystals based on complex oxides of group 3 elements such as Y3Al5O12:Ce, Y3Al5O12:Sc, Y3Al5O12:Re, Y3Al5O12:Sc:La, YAlO3:Ce, YAlO3:Ce:Yb, YAlO3:Ce:Sc, YAlO3:Eu, YAlO3:Re, YAlO3:Ti, and YAlO3:Ce:Ti are studied. Crystals based on complex oxides of group 3 elements have high thermal shock resistance and high corrosive resistance. These crystals have good temporal characteristics with their relatively high density and energy conversion efficiency. It is shown that these scintillators can be promising for the design of α-particle spectrometers with good energy resolution.
- ПубликацияТолько метаданныеDistributions of energy imparted to a micro-volume by secondary charged fragments of nuclear interactions in space radiation field(2023) Fedotov, S. N.; Kushin, V. V.; Федотов, Сергей Николаевич; Кушин, Владимир Васильевич
- ПубликацияТолько метаданныеThe role of nuclear fragmentations in high energy transfers to a micro-object exposed to primary space radiation(2024) Fedotov, S. N.; Kushin, V. V.; Федотов, Сергей Николаевич; Кушин, Владимир Васильевич
- ПубликацияТолько метаданныеAn approach to computer analysis of the ligand binding assay data on example of radioligand assay data(2020) Fedotov, S. N.; Федотов, Сергей Николаевич© 2020 World Scientific Publishing Europe Ltd.As a rule, receptor-ligand assay data are fitted by logistic functions (4PL model, 5PL model, Feldman's model). The preparation of the initial estimates for parameters of these functions is an important problem for processing receptor-ligand interaction data. This study represents a new mathematical approach to calculate the initial estimates more closely to the true values of parameters. The main idea of this approach is in using the modified linear least squares method for calculations of the parameters for the 4PL model and the Feldman's model. In this study, the convergence of model parameters to true values is verified for the simulated data with different statistical scatter. Also, the results of processing real data for the 4PL model and the Feldman's model are presented. A comparison is made of the parameter values calculated by the presented and a nonlinear method. The developed approach has demonstrated its efficiency in calculating the parameters of the complex Feldman"s models up to 4 ligands and 4 sites.