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Vyunishev, A. M.
Cherenkov second harmonic generation of femtosecond laser pulses in a homogeneous nonlinear crystal / A. M. Vyunishev, A. S. Chirkin // Laser Phys. - 2024. - Vol. 34, Is. 8. - Ст. 085402, DOI 10.1088/1555-6611/ad5156. - Cited References: 37 . - ISSN 1054-660X. - ISSN 1555-6611
Кл.слова (ненормированные):
second harmonic generation -- nonlinear diffraction -- nonlinear Cherenkov radiation -- femtosecond laser pulses
Аннотация: In experiments on second harmonic (SH) generation (SHG), a conical structure of radiation has been observed. In the present study, a non-stationary theory of SH excitation of ultrashort laser pulses with phase modulation has been developed, which explains the properties of such a structure as Cherenkov radiation. Under phase-mismatched interactions, a maximum of the SH spectrum is observed at the Cherenkov angle, which is determined by the ratio of the SH and laser radiation phase velocities. It is shown that tightly focused laser beams are preferred to observe Cherenkov SHG. The SH spectral width depends on the group velocity mismatch and is more complicated on the excited radiation spectrum. The SH energy can be proportional to the crystal length or group delay length depending on their ratio. We also demonstrate that a complex angular distribution of spectral components (an angular chirp) appears within the SH cross-section.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Photonics and Laser Technology, Siberian Federal University, Krasnoyarsk 660079, Russia
M.V. Lomonosov Moscow State University, Moscow 119991, Russia

Доп.точки доступа:
Chirkin, A. S.; Вьюнышев, Андрей Михайлович
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Tikhomirov, A. A.
Photo-biological effectiveness of PAR for radish plant communities irradiated using an LED source with an adjustable spectrum / A. A. Tikhomirov, M. S. Molokeev, V. V. Velichko // Light Eng. - 2024. - Vol. 32, Is. 2. - P. 70–77, DOI 10.33383/2023-063. - Cited References: 15. - The study was carried out with financial support within the framework of State Assignment 121101300066-7 of the Ministry of Education and Science and the Strategic Academic Leadership Program "Priority-2030" for the Siberian Federal University . - ISSN 0236-2945. - ISSN 2541-9935
Кл.слова (ненормированные):
spectral composition of radiation -- spectral effectiveness of radiation -- variable radiation spectrum -- fluorescent LEDs -- radish productivity
Аннотация: The aim of the current study was to find the most effective spectral modes of irradiation of short-season plants (for example, radish) using a fluorescent LED irradiator with a variable spectrum. The research methodology was based on the species-specific response of plants to the spectral composition of light. Photo-biological experiments were carried out to find effective spectral composition of PAR for cultivating radish communities under stable and variable irradiation modes of electrical lighting. It was shown that under stable irradiation modes, the highest productivity of economically useful radish biomass had been achieved at spectral composition with a maximum of 60 % radiation in the (600–700) nm region in a variable spectral irradiation mode. The variable spectral irradiation mode turned out to be the most effective when the spectral composition with the dominance of red rays was changed to the spectral composition with the dominance of blue rays. There were no significant differences between the best production parameters for stable and variable modes of irradiation of radish plants, which indicates the expediency of choosing the stable spectral mode of irradiation of radish plants as a short-season crop under electrical illumination. The results obtained can be used to select spectral irradiation modes for short-season plants grown under electrical lighting in northern regions and in isolated rooms in various climatic zones using "City-farm" technologies.

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Держатели документа:
Biophysics Institute of the Siberian branch of Russian Academy of Sciences, Krasnoyarsk, Russia
Reshetnyov Siberian State University of Science and Technology, Krasnoyarsk, Russia
Institute of Physics SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Velichko, V. V.
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Influence of arabinogalactan-coated selenium nanoparticles on the formation of free radicals in Ehrlich ascites carcinoma cells / K. V. Shadrin, Yu. A. Yakovleva, O. V. Kryukova [et al.] // BioNanoScience. - 2024. - Vol. 14, Is. 1. - P. 268-275, DOI 10.1007/s12668-023-01251-6. - Cited References: 40 . - ISSN 2191-1630. - ISSN 2191-1649
Кл.слова (ненормированные):
Selenium -- Nanoparticles -- Microwave radiation -- Antioxidant properties -- Ehrlich ascitic carcinoma
Аннотация: The antioxidant properties of selenium nanoparticles coated with arabinogalactan have been studied. The nanoparticles were characterized by transmission electron microscopy and infrared spectroscopy. Arabinogalactan-coated selenium nanoparticles were incubated together with Ehrlich ascitic carcinoma cells and then exposed to microwave radiation. The antioxidant properties of selenium nanoparticles were evaluated using chemiluminescent analysis. The viability of Ehrlich ascitic carcinoma cells under microwave irradiation and incubation with selenium nanoparticles was assessed by flow cytometry. Under conditions of exposure to experimental tumor cells of microwave radiation, the concentration of free radicals in the cells did not change. The effect of arabinogalactan-coated selenium nanoparticles on tumor cells is expressed as an increase in the delay time for the activation of the antioxidant system.

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Держатели документа:
Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, P. Zeleznyak street, 1, 660022, Krasnoyarsk, Russia
Krasnoyarsk Science Center, Federal Research Center KSC SB RAS, Akademgorodok 50, 660036, Krasnoyarsk, Russia
Siberian Federal University, Svobodny, 79, 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, 660036, Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Shadrin, K. V.; Yakovleva, Yu. A.; Kryukova, O. V.; Makarskaya, G. V.; Tarskikh, S. V.; Pyankov, V. F.; Pakhomova, V. G.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Vorobyev, S. A.; Stolyar, S. V.; Столяр, Сергей Викторович
}
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Karavayskiy, A. Yu.
The effect of clay content on the spectra of permetivity of mineral soils at positive temperatures / A. Y. Karavayskiy, Y. I. Lukin // Conf. Proc. - Radiat. Scatt. Electromagn. Waves, RSEMW. - 2023. - P. 456-459, DOI 10.1109/RSEMW58451.2023.10201998. - Cited References: 17. - The work was financially supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund for Support of Scientific and Scientific and Technical Activities within the framework of the scientific project No. 22-27-20112
Кл.слова (ненормированные):
real permittivity -- water content -- mineral soil -- soil moisture -- crossover frequency
Аннотация: In this research, it was studied the crossover frequencies of the spectra of the real part of the permittivity of moist mineral soils with different clay content from 10 to 64% in the frequency range from 15 MHz to 15 GHz and in the temperature range from 25 to 0 °C. Based on the experimental dependences obtained, empirical models were proposed for the average crossover frequency of the soil of the real part of the permittivity spectra in the range of changes of these frequencies values with temperature changes, as well as for the half-widths of the ranges of changes.

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Держатели документа:
Kirensky Institute of Physics, The Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Lukin, Y. I.; Лукин, Юрий Иванович; Каравайский, Андрей Юрьевич; Radiation and Scattering of Electromagnetic Waves 2023(26 - 30 June 2023 ; Divnomorskoe, Russian Federation)
}
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    Infrared bound states in the continuum: random forest method / M. S. Molokeev, A. S. Kostyukov, A. E. Ershov [et al.] // Opt. Lett. - 2023. - Vol. 48, Is. 17. - P. 4460-4463, DOI 10.1364/OL.494629. - Cited References: 42. - Ministry of Science and Higher Education of the Russian Federation (FSRZ-2023-0006) . - ISSN 0146-9592. - ISSN 1539-4794
   Перевод заглавия: Инфракрасные связанные состояния в континууме: метод случайного леса
Кл.слова (ненормированные):
Field enhancement -- Infrared radiation -- Neural networks -- Refractive index -- Second harmonic generation -- Subwavelength gratings
Аннотация: In this Letter, we consider optical bound states in the continuum (BICs) in the infrared range supported by an all-dielectric metasurface in the form of subwavelength dielectric grating. We apply the random forest machine learning method to predict the frequency of the BICs as dependent on the optical and geometric parameters of the metasurface. It is found that the machine learning approach outperforms the standard least square method at the size of the dataset of ≈4000 specimens. It is shown that the random forest approach can be applied for predicting the subband in the infrared spectrum into which the BIC falls. The important feature parameters that affect the BIC wavelength are identified.

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Держатели документа:
IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen, 625003, Russia
Institute of Computational Modelling SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Kostyukov, A. S.; Ershov, A. E.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Gerasimov, V. S.; Polyutov, S. P.
}
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    Electrically-tunable reflectarrays for millimeter waves based on liquid-crystal-loaded high-impedance surfaces / S. A. Kuznetsov, V. I. Lapanik, A. A. Lugouskiy [et al.] // The 5-th International conference "Terahertz and microwave radiation: generation, detection and applications" (TERA-2023) : abstract book. - Москва, 2023. - P. 11
   Перевод заглавия: Электрически перестраиваемые отражательные решетки для миллиметрового диапазона волн на основе высокоимпедансных поверхностей с жидкими кристаллами

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Держатели документа:
Novosibirsk State University
Shevchenko Institute of Applied Physical Problems, Minsk, Belarus
Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Siberian Federal University

Доп.точки доступа:
Kuznetsov, S. A.; Lapanik, V. I.; Lugouskiy, A. A.; Timofeev, S. N.; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; "Terahertz and microwave radiation: generation, detection and applications", International conference(5 ; 2023 ; Feb. 27- March 2 ; Moscow, Russia); «Терагерцевое и микроволновое излучение: генерация, детектирование и приложения», конференции с международным участием(5 ; 2023 ; 27 февр. - 2 марта ; Москва); Национальный исследовательский ядерный университет МИФИ; Московский государственный университет им. М.В. Ломоносова; Национальный исследовательский центр "Курчатовский институт"
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Shchapova, Yuliya V..
Structural characteristics of radiation-amorphized ZrSiO4:U,Th according to Raman spectroscopy of Boson peak / Yu. V. Shchapova, A. S. Krylov, S. L. Votyakov // J. Raman. Spectrosc. - 2023. - Vol. 54, Is. 6. - P. 662-673, DOI 10.1002/jrs.6526. - Cited References: 66. - The study was carried out within IGG UB RAS State assignment, registration number 123011800012-9 (YVS and SLV). The authors thank Dmitry Zamyatin for performing electron probe microanalysis of zircon chemical composition. The authors are grateful to Olga Galakhova for X-ray diffraction measurements. The equipment of the «Geoanalitik» shared research facilities of the IGG UB RAS was used, the re-equipment and comprehensive development of which is financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 075-15-2021-680 (YVS and SLV). The temperature Raman experiments were performed in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center ‘Krasnoyarsk Science Center SB RAS’ . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
amorphous-crystalline structure -- Boson peak -- radiation damage -- zircon
Аннотация: The structure of the amorphous fraction and the tensile-compressive stressesin amorphous-crystalline radiation-damaged zircon ZrSiO:U,Th depending on radiation dose and temperature (8–350 K) are investigated according to Raman spectroscopy of Boson peak for the first time. The Boson peak at 60–70 cm-1 associated with localized phonon states in the amorphous fraction (fa) is recorded at low temperatures (T ˂ 100 K) for samples with fa ˂ 30% and over the entire temperature range 8–350 K for fa ˃ 70%. The wider localized states distribution in the latter case is considered as a sign of the amorphous phase structure evolution with an increase in radiation dose. The estimates of anatomic correlation radius based on the Ioffe–Regel criterion are similar to those in glasses, Rc2:0 – 2:3 nm. The monotonic increase in Rc value during heating of zircon with fa ˃ 70% is governed by thermal expansion of the percolating amorphous fraction. The nonmonotonic variations of the Rc value in zircon with fa ˂ 30% is determined by the stresses in the amorphous fraction due to the mismatch in thermal expansion coefficient (CTE) and elastic moduli of the amorphous and crystalline phases depending on temperature; a change in the sign of the crystalline fraction CTE at 30 K is assumed. The Boson peak disappearance at 100 K in zircon with fa ˂ 30% during heating conforms to with the violation of the phonon localization as a consequence of amorphous fraction contraction and partial ordering. The data obtained are important for predicting the thermal and mechanical properties of heterogeneous radiation-damaged materials and nanocomposites.

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Держатели документа:
Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences,Yekaterinburg, Russia
Ural Federal University named after the first President of Russia B. N. Yeltsin,Yekaterinburg, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS,Krasnoyarsk, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Votyakov, Sergei L.
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Muzalevskiy, K. V.
LPDA calibration using an UAV for synthesizing UWB impulses / K. Muzalevskiy // IEEE Antennas Wirel. Propag. Lett. - 2023. - Vol. 22, Is. 9. - P. 2140-2144, DOI 10.1109/LAWP.2023.3278333. - Cited References: 19. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project № 22-17-20042 . - ISSN 1536-1225. - ISSN 1548-5757
Кл.слова (ненормированные):
Log-periodic dipole antenna (LPDA) -- complex antenna transfer function -- complex antenna return loss -- ultra-wideband (UWB) impulses -- impulse radiation -- unmanned aerial vehicle (UAV)
Аннотация: In this letter, the possibility of synthesizing ultra-wideband (UWB) impulses with a conventional log-periodic dipole antenna (LPDA) mounted on a quadrotor unmanned aerial vehicle (UAV) was demonstrated. The formation of impulses using LPDA (bandwidth from 427 MHz to 1.01 GHz) with a duration of 1.9 ns, containing one period of field oscillations, became possible due to compensation of amplitude and phase-frequency distortions introduced by the antenna into radiated and received impulses. Compensation for these distortions was carried out by inverse filtering method after calibrating the antenna-feeder path at various heights UAV hovering above the reference reflector (brass mesh). The conductive carbon elements of UAV, located in the near field of the antenna, are indirectly taken into account during the calibration of antenna-feeder path parameters and do not introduce significant distortions into the generated impulses. The suggested method of synthesizing UWB impulses can find application in environmental remote sensing and can also be used to sharpen fronts of impulses radiated\received with LPDA.

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Держатели документа:
Kirensky Institute of Physics SB RAS Akademgorodok 36, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Музалевский, Константин Викторович
}
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Belyaev, B. A.
Radiation of a material particle placed in a dielectric medium under the action of electromagnetic field / B. A. Belyaev, V. V. Tyurnev, D. A. Shabanov // J. Exp. Theor. Phys. - 2022. - Vol. 135, Is. 6. - P. 796-799, DOI 10.1134/S1063776122120020. - Cited References: 15 . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация: It has been shown that taking account of radiation from a material particle with negative relative permittivity εp that is in a dielectric medium with permittivity εm and experiences the action of an electromagnetic field prevents unlimited growth of particle’s electric dipole moment and its related electric fields if 2εm + εp → 0 and the medium and particle are lossless. Calculated radiation losses are embodied in a correction to the dielectric losses of a real particle. Using polystyrene with a silver nanoparticle showing negative permittivity in the optical range as an example, the behavior of the particle versus particle size has been studied for the permittivity varying in the interval –16 ˂ εp ˂ 16. It has been found that even if the permittivity of the nanoparticle is positive, taking the particle radiation into account considerably improves the accuracy of quasistatic calculation.

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Публикация на русском языке Беляев, Борис Афанасьевич. Излучение материальной частицы, находящейся в диэлектрической среде под воздействием электромагнитного поля [Текст] / Б. А. Беляев, В. В. Тюрнев, Д. А. Шабанов // Журн. эксперим. и теор. физ. - 2022. - Т. 162 Вып. 6. - С. 830-834

Держатели документа:
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia

Доп.точки доступа:
Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Shabanov, D. A.; Шабанов, Дмитрий Александрович; Беляев, Борис Афанасьевич
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10.

Muzalevskiy, K. V.
Synthesizing of ultra-wide band impulse by means of a log-periodic dipole antenna. Case study for a radar stand experiment / K. Muzalevskiy, M. Mikhaylov, Z. Ruzicka // 2022 IEEE International Multi-Conference on Engineering, Computer and Information Sciences, SIBIRCON 2022 : IEEE, 2022. - P. 1140-1143, DOI 10.1109/SIBIRCON56155.2022.10017008. - Cited References: 20. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project № 22-17-20042
Кл.слова (ненормированные):
Microwave remote sensing -- log-periodic dipole antenna -- calibration antenna -- complex antenna transfer function -- ultra-wide band impulse -- radiation and receiving impulse
Аннотация: In this work, the approach of ultra-wide band pulses synthesizing is proposed using a broadband low-cost log-periodic dipole antenna and a vector network analyzer. Synthesis of UWB pulse (duration of 2.2ns) became possible due to minimization of antenna dispersion by compensation of amplitude and phase-frequency distortions introduced by the antenna into radiated and received pulse. The method had been developed for a down-looking antenna in a monostatic radar configuration. The antenna return loss was calculated using the model of two-port linear network with S-parameters. To calibrate the model, an original amplitude-phase method was proposed that requires measuring the antenna's return loss when the antenna is located only at several heights above the reflecting surface (metal sheet). In this case, the antenna return loss in an empty room does not need to be measured. The proposed method for synthesizing UWB pulses does not require changes in the design of the antenna and can be implemented as an additional software calibration of the antenna-feeder path. The proposed method of UWB pulses synthesizing can be implemented using miniature, low-cost vector network analyzers for environment remote sensing from unmanned aerial vehicle using the UWB impulses.

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Держатели документа:
Kirensky Institute of Physics Federal Research Center, Laboratory of Radiophysics of the Earth Remote Sensing, KSC Siberian Branch, Russian Academy of Science, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mikhaylov, M. I.; Михайлов, Михаил Иванович; Ruzicka, Z.; Ружичка, Зденек; Музалевский, Константин Викторович; IEEE International Multi-Conference on Engineering, Computer and Information Sciences 2022(1-13 November 2022 ; Yekaterinburg, Russian Federation)
}
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