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Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ / Petrov M.I., Gokhfeld Yu.S., Balaev D.A., Popkov S.I., Dubrovskiy A.A., Gokhfeld D.M., Shaykhutdinov K.A. // 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, Yu. S.; Гохфельд, Ю. С.; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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Temperature Raman study of Li4Ti5O12 and ambiguity in the number of its bands / A. A. Nikiforov, A. S. Krylov, S. N. Krylova [et al.] // J. Raman Spectrosc. - 2024. - Vol. 55, Is. 3. - P. 406-415, DOI 10.1002/jrs.6641. - Cited References: 51. - The research was funded by the Russian Science Foundation (project No 22-22-00350, https://rscf.ru/project/22-22-00350) . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
defects -- distortions -- lithium titanate -- lithium titanium oxide -- spinel structure
Аннотация: The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X-Ray diffraction and Raman spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted Raman spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed Raman-active bands. Our low-temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.

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Держатели документа:
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russia
Independent Researcher, Ekaterinburg, Russia

Доп.точки доступа:
Nikiforov, A. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Gorshkov, V. S.; Pelegov, D. V.
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Synthesis of Ni nanoclusters supported on diamond by plasma technique and their electrochemical properties / N. S. Nikolaev, V. G. Isakova, N. G. Vnukova [et al.] // Diam. Relat. Mater. - 2024. - Vol. 142. - Ст. 110844, DOI 10.1016/j.diamond.2024.110844. - Cited References: 35 . - ISSN 0925-9635. - ISSN 1879-0062
Кл.слова (ненормированные):
High pressure – high temperature (HTHP) diamond -- Nickel plasma -- Cyclic voltammetric -- Electrocatalytic activity -- Methanol -- Paracetamol
Аннотация: In this study, particles of synthetic undoped diamond (DN) obtained via the high pressure – high temperature method were coated with a nickel shell using metallic nickel plasma in a two-jet plasma generator with gas vortex and magnetic flux stabilization. Through the use of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, we observed the formation of a nickel diamond composite with a core-shell structure, where DN serves as the core and Ni nanoclusters form the shell (DN@Ni). The results of voltammetric analysis indicated that DN@Ni, when deposited on a graphite electrode, exhibited significant electrocatalytic activity in the oxidation of methanol and paracetamol in an alkaline electrolyte.

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Держатели документа:
Kirensky Institute of Physics, FSBSI "Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/38, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Academician Kirensky str., 28, Krasnoyarsk 660074, Russia
Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, FSBSI "Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/24, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Nikolaev, N. S.; Николаев, Никита Сергеевич; Isakova, V. G.; Исакова, Виктория Гавриловна; Vnukova, N. G.; Внукова, Наталья Григорьевна; Elesina, V. I.; Елесина, Виктория Игоревна; Glushenko, G. A.; Глущенко, Гарий Анатольевич; Tomashevich, Y. V.; Томашевич, Евгений Владимирович; Churilov, G. N.; Чурилов, Григорий Николаевич
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Raman study of decomposition of Na-bearing carbonates in water fluid at high P–T parameters / S. Goryainov, A. Krylov, U. Borodina [et al.] // Spectrochim. Acta - A: Mol. Biomol. Spectrosc. - 2024. - Vol. 322. - Ст. 124801, DOI 10.1016/j.saa.2024.124801. - Cited References: 74. - Authors thank V.S. Shevchenko, A.F. Shatskiy, A.G. Sokol and A.V. Golovin for fruitful discussion. We acknowledge I.N. Kupriyanov for discussion and measurements of FTIR spectra of the samples. This work was carried out within the framework of the Russian Federation state assignment of the Sobolev Institute of Geology and Mineralogy SB RAS (state registration number: 122041400176-0) and A.K., S.K and A.V. thanks for support the Russian Federation state assignment of Kirensky Institute of Physics, Federal Research Center KSC SB RAS (state registration number: FWES-2024-0003). Work partially supported by the Russian Foundation for Basic Researches (RFBR-21-55-14001 ANF a grant). Equipment and devices of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were used for Raman experiments at high P–T conditions . - ISSN 1386-1425. - ISSN 1873-3557
Кл.слова (ненормированные):
Raman spectroscopy -- Carbonates -- High pressure -- High temperature -- Abiogenic formation of organics -- Organic formates -- Organic molecular crystals
Аннотация: The study of Na-carbonates stability and their transformations in aqueous carbonate fluid under high P–T conditions is relevant from the point of view of the understanding geochemical processes of the Na-assisted carbon circulation in the Earth’s crust and subduction zones. In situ Raman study of Na-bearing carbonate-water-Fe-metal system in diamond anvil cell (DAC) at high P–T conditions revealed that carbonates decompose with abiogenic formation of formates and other organic compounds that differs from behavior of carbonates in dry system. XRD and FTIR methods have been used additionaly to determine the phase composition. Na-bearing carbonates (nahcolite NaHCO3, shortite Na2Ca2(CO3)3 and cancrinite Na7Ca[(CO3)1.5Al6Si6O24]·2H2O) in aqueous fluid decompose to form simple carbonates and formates (as dominant organic molecules) at moderate P–T parameters (above ∼0.2 GPa, 200°C). Our experimental results directly confirm the hypothesis of Horita and Berndt (Science, 1999) about possible yield of organic formates in the carbonate-water-metal system. Nahcolite NaHCO3 in aqueous fluid in the presence of Fe metal decomposes into anhydrous phases: natrite γ-Na2CO3, siderite, magnetite (due to dissolution of Fe steel gasket), Na-formate and likely organic molecular crystalline solvate of Na-formate and methyl formate. Shortite decays into anhydrous phases: aragonite CaCO3, Na-Ca-formates and an amorphous phase. Cancrinite decomposes to unidentified carbonate-alumonosilicate phases, Na-Ca-formates and unknown organic molecular crystal. Magnetite is also formed in this system due to dissolution of Fe steel gasket used in DAC. The present study provides a new insight in processes of abiogenic formation of organic matter from carbonates in the crust and upper mantle.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, prospect Acad. Koptyug 3, Novosibirsk, 630090, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, bld. 38, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Goryainov, S.; Krylov, A. S.; Крылов, Александр Сергеевич; Borodina, U.; Likhacheva, A.; Krylova, S. N.; Крылова, Светлана Николаевна; Seryotkin, Yu.; Bogdanov, N.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Grishina, S.
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Small magnetic hysteresis in Bi2223 polycrystalline high-temperature superconductor / D. A. Balaev, S. V. Semenov, D. M. Gokhfeld, M. I. Petrov // J. Supercond. Nov. Magn. - 2024, DOI 10.1007/s10948-024-06802-w. - Cited References: 35 . - Article in press. - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
BSCCO -- Polycrystalline high-temperature superconductor -- Magnetic hysteresis -- Critical state model -- Magnetic flux compression
Аннотация: Bi‒Sr‒Ca‒Cu‒O polycrystalline high-temperature superconductors with the 2–2-2–3 structure have been comprehensively studied, their properties have been described, and features of the small magnetic hysteresis in the investigated materials have been established. The small magnetic hysteresis is shown to be caused by the penetration of a magnetic flux into a superconductor and its capture in the region of boundaries between HTS crystallites and by Meissner currents flowing through these boundaries. It has been found that, at a certain magnetic prehistory, the small hysteresis collapses, i.e. its footprints disappear. This has been attributed to the interaction between two superconducting subsystems in the investigated polycrystalline HTS, specifically, the effect of the magnetic moments of HTS crystallites on the effective field in the regions of intercrystalline boundaries. The shape of the small magnetic hysteresis loop has been described within the critical state model.

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Держатели документа:
Siberian Branch, Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
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Optical thermometer based on efficient near-infrared dual-emission of Cr3+ and Ni2+ in magnetoplumbite structure / Qianqian Zhang, Guogang Li, Guangzhi Li [et al.] // Adv. Optical Mater. - 2024. - Vol. 12, Is. 1. - Ст. 2301429, DOI 10.1002/adom.202301429. - Cited References: 22. - This work was financially supported by the National Science and Technology Major Project (2022YFB3503800), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51929201, 52072349, 52172166), the Natural Science Foundation of Zhejiang Province (LR22E020004), and the Project funded by China Postdoctoral Science Foundation (2022TQ0365). M.S. Molokeev acknowledges the support by the Ministry of Science and Higher Education of Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 2195-1071
Кл.слова (ненормированные):
energy transfers -- NIR dual emissions -- NIR-LED -- optical temperature sensing
Аннотация: Recently, an optical thermometer based on the dual-emitting fluorescent intensity ratio (FIR) in the visible light (VIS) region has achieved great development. However, there is very little progress in thermometers from NIR light. In this work, a novel optical thermometer based on highly efficient NIR dual-emission of Cr3+ and Ni2+ in LaZnGa11O19 (LZG) with a magnetoplumbite structure is designed. Utilizing energy transfer from Cr3+ to Ni2+, the dual-emission shows a wide coverage in the 650–1600 nm region, covering the NIR I and II windows, respectively. The as-reported LZG:0.3Cr3+ and LZG:0.3Cr3+,0.01Ni2+ phosphors can reach internal/external quantum efficiency (IQE/EQE) of 94%/64% and 77%/53%, respectively. The electroluminescence property and potential applications in spectroscopic analysis, night-vision, and bioimaging of fabricated NIR-LED with LZG:0.3Cr3+,0.01Ni2+ have also been investigated. In addition, the designed ratiometric optical thermometer responds to wide temperature ranges (100-175 K, 200–475 K) and shows a maximum relative sensitivity value (Sr) of 2.4% K−1 at 475 K. The optical performance of absorption in the red region and emission in the NIR region enables the LZG:0.3Cr3+,0.01Ni2+ to become a candidate for NIR optical thermometers in biotechnological applications.

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Держатели документа:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei2 30026, China
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan4 30074, China
Zhejiang Institute, China University of Geosciences, Hangzhou 311305, China
College of Pharmacy, Jiamusi University, Jiamusi, Heilongjiang 154007, P. R. China
International Research Center of Spectroscopy and Quantum Chemistry—IRCSQC, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Zhang, Qianqian; Li, Guogang; Li, Guangzhi; Liu, Dongjie; Dang, Peipei; Qiu, Lei; Lian, Hongzhou; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Jun
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Room temperature ferromagnetism in graphene/SiC(0001) system intercalated by Fe and Co / S. O. Filnov, D. A. Estyunin, I. I. Klimovskikh [et al.] // Phys. Status Solidi - Rapid Res. Lett. - 2024. - Vol. 18, Is. 3. - Ст. 2300336, DOI 10.1002/pssr.202300336. - Cited References: 76. - This research was funded by the Ministry of Science and Higher Education of the Russian Federation grant no. 075-15-2020-797 (13.1902.21.0024) . - ISSN 1862-6254. - ISSN 1862-6270
Аннотация: The utilization of graphene on silicon carbide (SiC) substrates holds substantial promise for advancements in spintronics and nanoelectronics. Furthermore, incorporating magnetic metals provides an optimal framework for probing fundamental physical phenomena. The approach to developing such systems is in situ intercalation of graphene with magnetic metals. Herein, the electronic structure is analyzed and the magnetic properties of the system are synthesized by the thermal decomposition of 6H-SiC(0001) surface and subsequent intercalation of graphene with cobalt (Co) and iron (Fe) atoms. X-ray photoemission spectroscopy and low-energy electron diffraction are employed to control the synthesis and metal intercalation processes. The morphological characteristics of the synthesized system are studied by means of atomic force microscopy. The findings derived from magneto-optic Kerr effect measurements reveal a homogeneous ferromagnetic ordering at room temperature. Angle-resolved photoemission spectroscopy is used to ascertain the impact of intercalation on graphene's electronic structure. The results of this study are essential for the development of graphene-based spintronics and nanoelectronic devices as well as for fundamental studies in magnetic graphene systems.

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Держатели документа:
Saint Petersburg State University, Saint Petersburg, 198504, Russian Federation
Donostia International Physics Center, Donostia-San Sebastian, 20018, Spain
Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Kol'tsovo, 630559, Russian Federation
National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation

Доп.точки доступа:
Filnov, S. O.; Estyunin, D. A.; Klimovskikh, I. I.; Estyunina, T. P.; Golyashov, V. A.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Komarov, V. A.; Комаров, Василий Андреевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Rybkina, A. A.; Vilkov, O. Yu.; Shikin, A. M.; Tereshchenko, O. E.; Chumakov, R. G.; Lebedev, A. M.; Rybkin, A. G.
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Relaxation of the trapped magnetic flux in a mesoscopic HTS with artificial pinning in the form of submicron holes / A. N. Maksimova, D. M. Gokhfeld, A. N. Moroz, V. A. Kashurnikov // Chin. J. Phys. - 2024. - Vol. 88. - P. 493-502, DOI 10.1016/j.cjph.2023.11.030. - Cited References: 31. - V.A. Kashurnikov and A.N. Maksimova were supported by the Ministry of Science and Higher Education of the Russian Federation (state task project No. FSWU-2023-0031), A.N. Moroz was supported by MEPhI Program Priority 2030 . - ISSN 0577-9073. - ISSN 2309-9097
Кл.слова (ненормированные):
High-temperature superconductor -- trapped flux -- pinning -- relaxation
Аннотация: Vortex relaxation has been studied in a microsized HTS with various distributions of artificial pinning in the form of submicro-holes. It has been shown that, in some cases, for a superconductor with dimensions up to several micrometers, the time dependences of the trapped magnetic field do not correspond with the collective creep model. The dependences of the trapped-field relaxation rate and vortex activation energy on the magnetizing field (up to 0.5 T) and temperature (up to 50 K) have been obtained. It has been shown that the presence of submicro-holes slightly increases the relaxation rate, mainly due to the decrease in the number of random nanosized pinning centers.

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Держатели документа:
National Research Nuclear University MEPhI, Moscow, 115409 Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia
Siberian Federal University, Krasnoyarsk, 660041 Russia

Доп.точки доступа:
Maksimova, A.N.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Moroz, A.N.; Kashurnikov, V.A.
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    Каравайский, Андрей Юрьевич.
    Модель комплексной диэлектрической проницаемости органо-минеральных почв, учитывающая минеральный состав и содержание органического вещества / А. Ю. Каравайский, С. В. Фомин, Ю. И. Лукин // Журн. радиоэлектрон. - 2024. - № 1. - Ст. 6 ; J. Radio Electron., DOI 10.30898/1684-1719.2024.1.9. - Библиогр.: 29 . - ISSN 1684-1719
   Перевод заглавия: The model of permittivity of organomineral soils, considering mineral composition and organic matter content
Кл.слова (ненормированные):
диэлектрическая модель -- влажность -- температура -- органическая почва -- минеральная почва -- мерзлая почва -- талая почва -- dielectric model -- moisture -- temperature -- organic soil -- mineral soil -- frozen soil -- thawed soil
Аннотация: На основе рефракционной диэлектрической модели создана одночастотная диэлектрическая модель талых и мерзлых лесных почв корневой зоны, учитывающая влияние как минеральной, так и органической компоненты почвенной смеси. Модель разработана для частоты 435 МГц на основе диэлектрических измерений пяти почв, в которых содержание органического вещества варьировалось от 11,1 до 54,4 % и глины от 21,1 до 40,9 %. Диэлектрические измерения были проведены в диапазоне массовой влажности от сухого состояния до наименьшей влагоемкости и диапазоне температур от – 30 до 25 ℃. В исследуемом диапазоне температур коэффициент детерминации между рассчитанными с использованием предложенной модели и измеренными значениями действительной (ε') и мнимой (ε") частями комплексной диэлектрической проницаемости составляет 0,988 – 0,997 для ε' и 0,957 – 0,971 для ε". Нормированное среднеквадратическое отклонение при этом составило 6 – 5,6 % для ε' и 20,2 – 21,2 % для ε". Разработанная диэлектрическая модель может быть применена в алгоритмах дистанционного зондирования при восстановлении значения влажности лесных почв корневой зоны из данных радарного и радиометрического зондирования.
The single-frequency dielectric model of thawed and frozen forest soils in the root zone based on the refractive dielectric model was created, taking into account the influence of both the mineral and organic components of the soil mixture. The dielectric model was created on at 435 MHz the basis of the laboratory dielectric measurements of five soils with organic matter content in the range from 11.1 to 54.4 % and clay content from 21.1 to 40.9 %. Dielectric measurements were carried out in the range of the gravimetric moisture from the dry state to the lowest moisture capacity and in the temperature range from –30 to 25 ℃. The coefficient of determination between the predicted and measured values for real and imaginary parts of the complex permittivity are 0.988 - 0.997 and 0.957 - 0.971, respectively. The normalized standard deviations in this case are 6 - 5.6 % and 20.2 - 21.2 % for real and imaginary parts of the complex permittivity, respectively. The developed dielectric model can be used in remote sensing algorithms of soil moisture retrieval of forest soils in the root zone from the data radar and radiometric.

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения РАН, 660036, Красноярск, ул. Академгородок 50, стр. 38

Доп.точки доступа:
Фомин, Сергей Викторович; Fomin, S. V.; Лукин, Юрий Иванович; Lukin, Y. I.; Karavaisky, A. Yu.

}
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10.

    Unveiling temperature-induced structural phase transition and luminescence in Mn2+-doped Cs2NaBiCl6 double perovskite / S. Banerjee, S. Saikia, M. S. Molokeev, A. Nag // Chem. Mater. - 2024. - Vol. 36, Is. 9. - P. 4750-4757, DOI 10.1021/acs.chemmater.4c00514. - Cited References: 49. - Authors acknowledge Dr. Arup Rath’s lab NCL Pune and SAIF-IIT Bombay for diffuse reflectance spectroscopy and ICP-AES measurements, respectively. A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of the Department of Science and Technology, India. Authors acknowledge the Department of Science and Technology India (FIST program, SR/FST/CS-II/2019/105) for temperature-dependent powder XRD and EPR data. S.B. is grateful to IISER Pune for a research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India. M.M. acknowledges the Russian Science Foundation, grant 24-43-00006 . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Обнаружение температурно-индуцированного структурного фазового перехода и люминесценции в двойном перовските Cs2NaBiCl6, легированном Mn2+
Аннотация: Halide double perovskites like Cs2NaBiCl6 are good host materials for luminescent dopants like Mn2+. The nature of photoluminescence (PL) depends on the local structure around the dopant ion, and doping may sometimes influence the global structure of the host. Here, we unveil the correlation between the temperature-induced (global) structural phase transition of Mn2+-doped Cs2NaBiCl6 with the local structure and PL of the Mn2+ dopant. X-ray diffraction analysis shows Mn2+-doped Cs2NaBiCl6 is in a cubic (Fm3m) phase between 300 and 110 K, below which the phase changes to tetragonal (I4/mmm), which persists at least until 15 K. The small (∼1%) doping amount does not alter the phase transition behavior of Cs2NaBiCl6. Importantly, the phase transition does not influence the Mn2+ d-electron PL. The PL peak energy, intensity, spectral width, and lifetime do not show any signature of the phase transition between 300–6 K. The hyperfine splitting in temperature-dependent electron paramagnetic spectra of Mn2+ ions also remain unchanged across the phase transition. These results suggest that the global structural phase transition of the host does not influence the local structure and emission property of the dopant Mn2+ ion. This structure–property insight might be explored for other transition-metal- and lanthanide-doped halide double perovskites as well. The stability of dopant emission regardless of the structural phase transition bodes well for their potential applications in phosphor-converted light emitting diodes.

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Держатели документа:
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk, 660041 Russia

Доп.точки доступа:
Banerjee, S.; Saikia, S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Nag, A.
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