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    Bobrov, P. P.
    The effect of dielectric relaxation processes on the complex dielectric permittivity of soils at frequencies from 10 kHz to 8 GHz—Part II: Broadband analysis / P. P. Bobrov, E. S. Kroshka, K. V. Muzalevskiy // IEEE Trans. Geosci. Remote Sens. - 2024. - Vol. 62. - Ст. 2000411, DOI 10.1109/TGRS.2023.3340693. - Cited References: 51 . - ISSN 0196-2892. - ISSN 1558-0644
   Перевод заглавия: Эффект процессов диэлектрической релаксации на комплексную диэлектрическую проницаемость почв на частотах от 10 кГц до 8 ГГц
Кл.слова (ненормированные):
dielectric measurement -- Dobson dielectric model -- Maxwell–Wagner effect -- refraction-relaxation model -- soil moisture
Аннотация: This article is the second in a series evaluating the effect of dielectric relaxation processes on the relatively effective complex dielectric permittivity (RCP) of soils. Part II is based on the results of experimental measurements in the frequency range 10 kHz to 8–20 GHz. The broadband dielectric spectrum model includes the high-frequency part as a model of the dielectric mixture and the relaxation part as the sum of three relaxation processes modeled by the Debye and Cole–Cole formulas. For modeling the high-frequency part of the spectrum, the Dobson and Mironov models were considered as possible options. As stated in Part I, the influence of relaxation processes on the imaginary part of the RCP extends up to frequencies of units of gigahertz. The increase in the imaginary part in these models was compensated by unrealistically high values of the specific electrical conductivity of free and bound water. We examined the correspondence of these models to experimental data at frequencies above 2–5 GHz, assuming that the conductivity of bound and free water is zero. The parameters of relaxation processes were found while solving the least-square optimization problem using the technique for determining the continuous distribution of relaxation times (DRTs). Found process parameters depend on the content of clay, organic carbon, and moisture of the samples. The more clay is in the soil, the greater the strength of these processes is. The influence of organic carbon with the conditions being equal consists in the reduction of the real and imaginary parts of RCP.

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Держатели документа:
Faculty of Physics, Omsk State Pedagogical University, 644043 Omsk, Russia
Omsk Scientific Center SB RAS (Institute of Radiophysics and Physical Electronics), 644099 Omsk, Russia
Kirensky Institute of Physics Federal Research Center KSC Siberian Branch Russian Academy of Sciences, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Kroshka, E. S.; Muzalevskiy, K. V.; Музалевский, Константин Викторович
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Absorption spectra of the purple nonsulfur bacteria light-harvesting complex: A DFT study of the B800 part / L. V. Begunovich, E. A. Kovaleva, M. M. Korshunov, V. F. Shabanov // J. Photochem. Photobiol. A: Chem. - 2024. - Vol. 450. - Ст. 115454, DOI 10.1016/j.jphotochem.2023.115454. - Cited References: 42. - This work was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation. Authors would like to thank Information Technology Centre, Novosibirsk State University for providing access to their supercomputers. L.V.B. would like to thank Irkutsk Supercomputer Center of SB RAS for providing the access to HPC-cluster «Akademik V.M. Matrosov» (Irkutsk Supercomputer Center of SB RAS, Irkutsk: ISDCT SB RAS; http://hpc.icc.ru, accessed 20.10.2023) . - ISSN 1010-6030. - ISSN 1873-2666
Кл.слова (ненормированные):
Photosynthesis -- LH2 -- Light harvesting -- Rhodoblastus acidophilus -- Bacteriochlorophyll -- DFT -- DFTB -- Optical spectra
Аннотация: We’ve studied the B800 part of Rhodoblastus acidophilus light-harvesting complex (LH2) by several quantum chemical techniques based on the density functional theory (DFT) and determined the specific method and a minimal reliable model suitable for further studies of the LH2. In addition to bacteriochlorophyll a molecules, the minimal model includes two α and one β chain amino acids. Within the model, we are able to reproduce the contribution of the B800 ring of nine bacteriochlorophyll a molecules to the near infrared Qy absorption band. We also discuss the use of hybrid DFT calculations for precise energy and optical estimations and DFT-based tight binding (DFTB) method for the large-scale calculations. Crucial importance of Hartree-Fock exchange interaction for the correct description of B800 peak position was shown.

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Держатели документа:
Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Begunovich, L. V.; Kovaleva, E. A.; Korshunov, M. M.; Коршунов, Максим Михайлович; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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Chemical pressure as an effective tool for tuning the structural disordering and barocaloric efficiency of complex fluorides (NH4)3MF7 (M: Sn, Ti, Ge, Si) / I. N. Flerov, M. V. Gorev, E. V. Bogdanov, N. M. Laptash // J. Phys. D: Appl. Phys. - 2024. - Vol. 57, Is. 17. - Ст. 175301, DOI 10.1088/1361-6463/ad211b. - Cited References: 39. - The study was supported by a Grant from the Russian Science Foundation No. 23-22-00115, https://rscf.ru/project/23-22-00115/ . - ISSN 0022-3727. - ISSN 1361-6463
Кл.слова (ненормированные):
fluorides -- phase transformation -- phase diagram -- entropy -- pressure -- barocaloric effect
Аннотация: Double fluoride salts (NH4)3M4+F7 (M4+: Sn, Ti, Ge, Si) demonstrate a high efficiency of using chemical pressure as a tool for control and tuning structural ordering/disordering, sensitivity to hydrostatic pressure, successions of the phase transitions, etc and, as a result, for purposeful variation within a wide range of parameters of barocaloric effect (BCE). The conventional and inverse BCEs near the triple points were found on the T − p phase diagrams, combination of which can be used to construct original cooling cycle in narrow temperature and pressure ranges. Reconstructive transformation between two cubic phases, Pm3-m ↔ Pa3-, realized in (NH4)3SnF7 at atmospheric pressure and in (NH4)3TiF7 at p ˃ 0.4 GPa are characterized by rather low thermal hysteresis, δT0 = 1 K, and a great entropy change, ΔSBCE = 110–152 J (kg · K)−1, depending on the size of the central atom. At above 300–350 K, a contribution to BCE associated with the regular thermal expansion of the crystal lattice becomes comparable to entropy and temperature changes under pressure in the region of the phase transitions. An analysis of the absolute, relative and integral barocaloric characteristics of (NH4)3M4+F7 compounds showed their high competitiveness with respect to other barocaloric materials considered as promising solid-state refrigerants.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074 Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.
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Fedchenko, D.
Rudner photonic topological insulators in the language of the Zhegalkin operators / D. Fedchenko, V. Kulikov, I. Timofeev // Nonlinear Phenom. Complex Syst. - 2023. - Vol. 26, Is. 1. - P. 72-76, DOI 10.33581/1561-4085-2023-26-1-72-76. - Cited References: 5 . - ISSN 1561-4085. - ISSN 1817-2458
Кл.слова (ненормированные):
photonic topological insulator -- cellular automata -- Wolfram codes -- Zhegalkin operator
Аннотация: A topological insulator is a material that exhibits the properties of a conductor on the surface and of an insulator in the bulk. The Rudner game is a simplified model of a topological insulator implemented on a two-dimensional photonic lattice of resonators, which is described in the language of tricolor four-cycle two-dimensional Wolfram cellular automata. It is a case of a regular two-dimensional lattice, in which each cell is colored in one of three colors (for a photonic topological insulator, these colors mean the presence of a photon in a resonator, the absence of a photon, and a topological insulator boundary). By setting the transformation rule for each cell, depending on the state of the nearest neighbors and the cell itself, for equal discrete time intervals we obtain a cellular automaton. In this study, the Rudner game is rewritten equivalently in terms of operators in the Zhegalkin polynomial ring with coefficients in a field consisting of three elements.

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Держатели документа:
Siberian Federal University, Krasnoyarsk 660041, RUSSIA
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, RUSSIA

Доп.точки доступа:
Kulikov, V.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Федченко, Дмитрий Петрович
}
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    Kinetics and mechanism of BaLaCuS3 oxidation / N. O. Azarapin, N. A. Khritokhin, V. V. Atuchin [et al.] // Crystals. - 2023. - Vol. 13, Is. 6. - Ст. 903, DOI 10.3390/cryst13060903. - Cited References: 65. - The work was partially carried out using the resources of the Research Resource Center “Natural Resources Management and Physico-Chemical Research” (Tyumen University) with financial support from the Ministry of Science and Higher Education of the Russian Federation (contract No. 05.594.21.0019., Unique identification number RFMEFI59420X0019). M.S. Molokeev was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center’s project No. 89-DON (3). - The authors would like to thank the staff of the Engineering Center of the Tyumen State University (special Alexej V. Matigorov) for their help in carrying out physical and chemical tests . - ISSN 2073-4352
   Перевод заглавия: Кинетика и механизм окисления BaLaCuS3
Кл.слова (ненормированные):
BaLaCuS3 -- complex sulfide -- oxidation -- kinetic -- XRD analysis
Аннотация: The oxidation reactions of BaLaCuS3 in the artificial air atmosphere were studied at different heating rates in the temperature range of 50–1200 °C. The oxidation stages were determined by DSC-TG, XRD and IR–vis methods. The kinetic characteristics of the proceeding reactions were obtained with the use of the Kissinger model in a linearized form. Compound BaLaCuS3 was stable in the air up to 280 °C. Upon further heating up to 1200 °C, this complex sulfide underwent three main oxidation stages. The first stage is the formation of BaSO4 and CuLaS2. The second stage is the oxidation of CuLaS2 to La2O2SO4 and copper oxides. The third stage is the destruction of La2O2SO4. The final result of the high-temperature treatment in the artificial air atmosphere was a mixture of barium sulfate, copper (II) oxide and La2CuO4. The mechanism and stages of BaLaCuS3 oxidation and further interactions of the components were discussed.

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Держатели документа:
Department of Inorganic and Physical Chemistry, Tyumen State University, Tyumen 625003, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, Novosibirsk 630073, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, Tomsk 634034, Russia
Laboratory for Nanomaterials and Nanoelectronics, Center for Nature-Inspired Engineering, Technology Park, Tyumen State University, Tyumen 625003, Russia
Laboratory of Crystal Physics, 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 Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk 660041, Russia
Hybrid Nanodevice Research Group (HNRG), Department of Electrical Engineering, Indian Institute of Technology Indore, Indore 453552, India
Centre for Advanced Electronics (CAE), Indian Institute of Technology Indore, Indore 453552, India
School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
Institute of Solid State Chemistry, UB RAS, Yekaterinburg 620990, Russia

Доп.точки доступа:
Azarapin, N. O.; Khritokhin, N. A.; Atuchin, V. V.; Gubin, A. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mukherjee, S.; Andreev, O. V.
}
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Complex interplay between 3d and 4f magnetic systems in multiferroic DyMnO3 / A. N. Matveeva, I. A. Zobkalo, M. Meven [et al.] // J. Magn. Magn. Mater. - 2023. - Vol. 569. - Ст. 170415, DOI 10.1016/j.jmmm.2023.170415. - Cited References: 28. - The authors are grateful to S.V. Gavrilov for the technical assistance. This work was supported by the Russian Foundation for Basic Research grant # 19-52-12047, and DFG grant # SA 3688/1-1, also by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects number 18-42-243024 and 20-42-243008. The neutron data were obtained at the instrument HEiDi operated jointly by RWTH Aachen University and Jülich Centre for Neutron Science within JARA cooperation . - ISSN 0304-8853
Кл.слова (ненормированные):
Neutron diffraction -- Crystal structure -- Multiferroics -- Magnetic structure -- Manganites
Аннотация: Structural and magnetic properties of single crystals of DyMnO3 were investigated by neutron diffraction in order to study the peculiarities of 3d-4f interactions in this compound. Precise magnetic order and its detailed temperature evolution were determined using single crystal neutron diffraction. Elliptical cycloid on manganese subsystem below TCh = 19 K was confirmed, with temperature decrease the elipticity of the Mn magnetic structure reduces significantly, creating almost circular cycloid. Temperature evolution of the magnetic structure demonstrate specific hysteretic behavior. The results show a complex interplay between transition metal and rare earth magnetic sublattices leading to so-called “Mn- controlled” and “Dy- controlled” magnetic states. The strong and complicate 3d-4f interaction leads to the unusual very slow magnetic structure relaxation.

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Держатели документа:
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC «Kurchatov Institute», Gatchina, 188300, Russian Federation
Institute of Crystallography, RWTH Aachen University and Julich Centre for Neutron Science at Heinz Maier- Leibnitz Zentrum, Garching, Germany
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Matveeva, A. N.; Zobkalo, I. A.; Meven, M.; Freidman, A. L.; Фрейдман, Александр Леонидович; Semenov, S. V.; Семёнов, Сергей Васильевич; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Pavlovskiy, N. S.; Павловский, Николай Сергеевич; Kolkov, M. I.; Колков, Максим Игоревич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Hutanu, V.
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    Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors / C. S. Lim, A. Aleksandrovsky, M. Molokeev [et al.] // Crystals. - 2023. - Vol. 13, Is. 2. - Ст. 362, DOI 10.3390/cryst13020362. - Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046) . - ISSN 2073-4352
   Перевод заглавия: Структурные и спектроскопические эффекты замещения Na+ на Li+ в LixNa1-xCaLa0.5Er0.05Yb0.45(MoO4)3 ап-конверсионных люминофорах типа шеелита
Кл.слова (ненормированные):
microwave sol-gel synthesis -- complex molybdate -- scheelite -- crystal structure -- Raman -- frequency up-conversion -- band structure
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.

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Держатели документа:
Department of Aerospace Advanced Materials and Chemical Engineering, Hanseo University, Seosan 31962, Republic of Korea
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
School of Engineering and Construction, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia
Research and Development Department, Kemerovo State University, 650000 Kemerovo, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, 630073 Novosibirsk, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, 634034 Tomsk, Russia

Доп.точки доступа:
Lim, Chang S.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Atuchin, V.
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Lattice dynamics of the BaMg1/3Ta2/3O3 complex perovskite / S. N. Krylova, E. A. Popova, Yu. E. Kitaev, S. G. Lushnikov // Materials Science and Nanotechnology (MSN-2023) : abstract book of International conference / Ural Federal University; org. com. A. N. Vtyurin [et al.]. - Ekaterinburg, 2023. - Ст. O14. - P. 54. - Cited References: 9. - Russian Foundation for Basic Research and DFG project No 21-52-12018 . - ISBN 978-5-9500624-6-9

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Держатели документа:
Kirensky Institute of Physics SB RAS

Доп.точки доступа:
Vtyurin, A. N. \org. com.\; Втюрин, Александр Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Popova, E. A.; Kitaev, Yu. E.; Lushnikov, S. G.; Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина; Ural Federal University; "Materials science and nanotechnology", International conference(2023 ; Aug. 27-30 ; Ekaterinburg)
}
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The role of chemical pressure in the formation of the structure and barocaloric properties of complex fluorides and oxyfluorides / I. N. Flerov, M. V. Gorev, E. V. Bogdanov, N. M. Laptash // Crystallogr. Rep. - 2023. - Vol. 68, Is. 5. - P. 765-778, DOI 10.1134/S1063774523600485. - Cited References: 67 . - ISSN 1063-7745. - ISSN 1562-689X
Аннотация: The role of chemical pressure as an effective tool in the processes of formation of initial and distorted (as a result of structural transformations) phases, thermodynamic properties, and direct and inverse barocaloric effects in some complex oxyfluorides and fluorides with octahedral, tetrahedral, and spherical anion and cation groups in the structure has been studied. It is found that, due to the small temperature hysteresis and high baric sensitivity of materials, the maximum values of absolute and integral barocaloric characteristics can be implemented at low pressures. Correspondingly, the temperature range of reversibility of thermodynamic cycles based on fluorides/oxyfluorides as solid-state coolants can be expanded.

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Публикация на русском языке Роль химического давления в формировании структуры и барокалорических свойств комплексных фторидов и оксифторидов [Текст] / И. Н. Флёров, М. В. Горев, Е. В. Богданов, Н. М. Лапташ. - 14 с. // Кристаллография. - 2023. - Т. 68 № 5. - С. 776-789

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Branch, Vladivostok, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.
}
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10.

    Complex of ceftriaxone with Mg(II): Synthesis, structure, spectral and antibacterial properties / G. V. Novikova, D. I. Tsyplenkova, A. A. Kuzubov [et al.] // J. Sib. Fed. Univ. Chem. - 2023. - Vol. 16, Is. 1. - P. 5-15 ; Журн. СФУ. Химия. - Cited References: 28. - The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20–43–240007 . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: Комплекс цефтриаксона с Mg(II): синтез, структура, спектральные и антибактериальные свойства
Кл.слова (ненормированные):
cephalosporin antibiotic -- ceftriaxone -- magnesium -- density functional theory -- molecular spectroscopy -- antibacterial screening -- цефалоспориновые антибиотики -- цефтриаксон -- магний -- теория функционала плотности -- молекулярная спектроскопия -- антибактериальный скрининг
Аннотация: Magnesium complex of ceftriaxone was obtained and characterized by atomic-emission and elemental analysis, TGA, FTIR and Raman spectroscopy, X-ray diffraction and density functional theory calculations. Ceftriaxone was coordinated to the magnesium ion by the oxygen of the triazine cycle in the 6th position, the nitrogen of the amine group of the thiazole ring, and oxygen atoms of the lactam carbonyl and carboxylate groups. The disodium salt of ceftriaxone and magnesium complex were screened for antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa.
Получен и охарактеризован магниевый комплекс цефтриаксона методами атомно-эмиссионного и элементного анализов, ТГА, ИК- и КР‑спектроскопии, РФА и расчетов теории функционала плотности. Цефтриаксон координируется к иону магния через кислород триазинового цикла в шестом положении, азот аминогруппы тиазольного цикла и атомы кислорода карбоксильной и лактамной групп. Динатриевая соль цефтриаксона и комплекс магния были исследованы на антибактериальную активность в отношении Staphylococcus aureus, Escherichia coli и Pseudomonas aeruginosa.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
L.V. Kirensky Institute of Physics SB RAS Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russian Federation
Scientific Research Institute of Medical Problems of the North Federal Research Center “Krasnoyarsk Scientific Center of the SB RAS”, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS Federal Research Center "Krasnoyarsk Scientific Center of the SB RAS", Krasnoyarsk, Russian Federation

Доп.точки доступа:
Novikova, G. V.; Tsyplenkova, D. I.; Kuzubov, A. A.; Кузубов, Александр Александрович; Kolenchukova, O. A.; Samoilo, A. S.; Vorobyev, S. A.

}
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11.

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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12.

Charge-transfer plasmons of complex nanoparticle arrays connected by conductive molecular bridges / A. S. Fedorov, M. A. Visotin, E. V. Eremkin [et al.] // Phys. Chem. Chem. Phys. - 2022. - Vol. 24, Is. 32. - P. 19531-19540, DOI 10.1039/d2cp01811j. - Cited References: 43. - The work is supported (ASF, EVE, POK, and SPP) by the Russian Science Foundation (project no. 18-13-00363) . - ISSN 1463-9076
Кл.слова (ненормированные):
Charged nanoparticles -- Complex nanoparticles -- Coulombs energy -- External electromagnetic field -- Molecular bridges -- Molecular dynamics algorithms -- Molecular linkers -- Nanoparticle array -- Plasmon frequency -- Statistic approaches
Аннотация: Charge-transfer plasmons (CTP) in complexes of metal nanoparticles bridged by conductive molecular linkers are theoretically analysed using a statistic approach. The applied model takes into account the kinetic energy of carriers inside the linkers including its dissipation and the Coulomb energy of the charged nanoparticles. The plasmons are statistically investigated for systems containing a large number of complexes of bridged nanoparticles of realistic sizes generated using a simplified molecular dynamics algorithm, where the geometries of the complexes are dependent on the rate of connection of the linkers with the nanoparticles. As illustrated, the distribution of CTP frequencies in the generated nanoparticle complexes is very inhomogeneous. It has a narrow peak, corresponding to CTP plasmons in dimers, and two broad peaks, corresponding mainly to low and high-frequency oscillations in chains of connected nanoparticles. It is found that in general the plasmon frequencies depend inversely on the value of the complex dipole moment of the plasmon oscillation, where the assumption follows that low-frequency plasmons will be more efficiently excited in an external electromagnetic field. To calculate the CTP energy absorption in this field two model modifications are proposed: a system-external electromagnetic field interaction model and a simplified broadening plasmon peak model where the plasmons are calculated at first without damping and where the delta-shaped oscillation peaks are broadened then due to the damping. It is demonstrated that both modifications lead to a wide and almost monotonic absorption in the IR region for all generated systems containing a large number of bridged nanoparticles due to the presence of a large number of CTPs in this region.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry - IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, SE-751 20, Sweden
Federal Siberian Research Clinical Center under FMBA of Russia, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Visotin, M. A.; Высотин, Максим Александрович; Eremkin, E. V.; Krasnov, P. O.; Agren, H.; Polyutov, S. P.
}
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13.

    Орлов, Виталий Александрович.
    Лабораторный комплекс по физике с элементами автоматизации измерений и обработки результатов / В. А. Орлов, Э. В. Григорьев // XI Международная конференция по фотонике и информационной оптике : сборник научных трудов. - Москва, 2022. - С. 218-221. - Библиогр.: . - ISBN 978-5-7262-2842-6
   Перевод заглавия: Laboratory complex in physics with elements of automation of measurements and processing of results
Аннотация: Многие студенты инженерных специальностей университетов уже в школьные годы прошли хорошую подготовку в специализированных физико-математических классах, насыщенную физическим экспериментом. Оказавшись в стенах университета, такой студент вновь оказывается в физической лаборатории, где предлагаются вполне стандартные, уже знакомые, опыты (с незначительными вариациями). Это обстоятельство тормозит развитие пытливого ума, приводит к нерациональной трате материальных средств, оборудования, времени студента и преподавателя. Предлагаемый проект направлен на проектирование и создание комплекса лабораторного физического практикума и демонстрационного эксперимента, отвечающего современному уровню развития физической науки.
Many students of engineering specialties of universities, already in their school years, were well trained in specialized physics and mathematics classes, saturated with physical experiments. Once within the walls of the university, such a student again finds himself in a physics laboratory, where quite standard, already familiar, experiments are offered (with minor variations). This circumstance inhibits the development of an inquiring mind, leads to an irrational waste of material resources, equipment, time of the student and teacher. The proposed project is aimed at designing and creating a complex of laboratory physical practice and a demonstration experiment that meets the modern level of development of physical science.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Григорьев, Э. В.; Orlov, V. A.; Международная конференция по фотонике и информационной оптике(11 ; 2022 ; 26-28 янв. ; Москва); Российская академия наукНациональный исследовательский ядерный университет "МИФИ"
}
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14.

Synthesis, structure, and properties of EuLnCuSe3 (Ln = Nd, Sm, Gd, Er) / O. V. Andreev, V. V. Atuchin, A. S. Aleksandrovsky [et al.] // Crystals. - 2022. - Vol. 12, Is. 1. - Ст. 17, DOI 10.3390/cryst12010017. - Cited References: 60. - The study was funded by the Ministry of Science and Higher Education of the Russian Ferderation (Projects AAAA-A21-121011390011-4 and AAAA-A19-119031890025-9), as well as the Government of the Tyumen Region (grant to non-profit organizations No. 2. 89-don, dated 7 December 2020) . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
RARE-EARTH
   CRYSTAL-STRUCTURE
   MAGNETIC-PROPERTIES
   CHALCOGENIDES
Кл.слова (ненормированные):
rare earth elements -- complex sulfides -- chalcogenides -- crystal structure -- magnetic properties
Аннотация: EuLnCuSe3 (Ln = Nd, Sm, Gd, Er), due to their complex composition, should be considered new materials with the ability to purposefully change the properties. Samples of the EuLnCuSe3 were prepared using Cu, rare earth metal, Se (99.99%) by the ampoule method. The samples were obtained by the crystallization from a melt and annealed at temperatures 1073 and 1273 K. The EuErCuSe3 crystal structure was established using the single-crystal particle. EuErCuSe3 crystallizes in the orthorhombic system, space group Cmcm, KCuZrS3 structure type, with cell parameters a = 4.0555 (3), b = 13.3570 (9), and c = 10.4602 (7) Å, V = 566.62 (6) Å3. In structure EuErCuSe3, erbium ions are coordinated by selenium ions in the octahedral polyhedron, copper ions are in the tetrahedral coordination, europium ions are between copper and erbium polyhedra layers and are coordinated by selenium ions as two-cap trigonal prisms. The optical band gap is 1.79 eV. At 4.7 K, a transition from the ferrimagnetic state to the paramagnetic state was detected in EuErCuSe3. At 85 and 293 K, the compound is in a paramagnetic state. According to XRPD data, EuLnCuSe3 (Ln = Nd, Sm, Gd) compounds have a Pnma orthorhombic space group of the Eu2CuS3 structure type. For EuSmCuSe3, a = 10.75704 (15) Å, b = 4.11120 (5) Å, c = 13.37778 (22) Å. In the series of EuLnCuSe3 compounds, the optical band gap increases 1.58 eV (Nd), 1.58 eV (Sm), 1.72 eV (Gd), 1.79 eV (Er), the microhardness of the 205 (Nd), 210 (Sm), 225 (Gd) 235 ± 4 HV (Er) phases increases, and the thermal stability of the phases increases significantly. According to the measurement data of differential scanning calorimetry, the EuNdCuSe3 decomposes, according to the solid-phase reaction T = 1296 K, ΔH = 8.2 ± 0.8 kJ/mol. EuSmCuSe3 melts incongruently T = 1449 K, ΔH = 18.8 ± 1.9 kJ/mol. For the EuGdCuSe3, two (Tα↔β = 1494 K, ΔHα↔β = 14.8 kJ/mol, Tβ↔γ = 1530 K, ΔHβ↔γ = 4.8 kJ/mol) and for EuErCuSe3 three polymorphic transitions (Tα↔β = 1561 K, ΔHα↔β = 30.3 kJ/mol, Tβ↔γ = 1579 K, ΔHβ↔γ = 4.4 kJ/mol, and Tγ↔δ = 1600 K, ΔHγ↔δ = 10.1 kJ/mol). The compounds melt incongruently at the temperature of 1588 K, ΔHmelt = 17.9 ± 1.8 kJ/mol and 1664 K, ΔHmelt = 25.6 ± 2.5 kJ/mol, respectively. Incongruent melting of the phases proceeds with the formation of a solid solution of EuSe and a liquid phase.

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Держатели документа:
Univ Tyumen, Inst Chem, Tyumen 625003, Russia.
RAS, Inst Semicond Phys, Lab Opt Mat & Struct, SB, Novosibirsk 630090, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Novosibirsk State Tech Univ, Dept Ind Machinery Design, Novosibirsk 630073, Russia.
RAS, KSC, Fed Res Ctr, Kirensky Inst Phys,SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660036, Russia.
Ind Univ Tyumen, Dept Gen & Special Chem, Tyumen 625000, Russia.
RAS, Boreskov Inst Catalysis, SB, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Lab Mol Design & Ecol Safe Technol, Novosibirsk 630090, Russia.
RAS, Inst Solid State Chem, UB, Ekaterinburg 620990, Russia.

Доп.точки доступа:
Andreev, O. V.; Atuchin, V. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Denisenko, Y. G.; Zakharov, B. A.; Tyutyunnik, A. P.; Habibullayev, N. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ulybin, D. A.; Shpindyuk, D. D.; Ministry of Science and Higher Education of the Russian Ferderation [AAAA-A21-121011390011-4, AAAA-A19-119031890025-9]; Government of the Tyumen Region [2. 89-don]
}
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15.

Complex study of magnetization reversal mechanisms of FeNi/FeMn bilayers depending on growth conditions / C. Gritsenko, V. Lepalovskij, M. Volochaev [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 7. - Ст. 1178, DOI 10.3390/nano12071178. - Cited References: 44. - This work has been supported by the grant of the Slovak Research and Development Agency under the contract No APVV-20-0324. This work was in part financially supported by the Ministry of Science and Higher Education of the Russian Federation, Subject of the state task No. FEUZ-2020-0051 . - ISSN 2079-4991
Кл.слова (ненормированные):
exchange bias -- exchange spring -- AFM grain size -- substrate temperature -- hysteresis loop asymmetry -- magnetization reversal
Аннотация: Magnetization reversal processes in the NiFe/FeMn exchange biased structures with various antiferromagnetic layer thicknesses (0–50 nm) and glass substrate temperatures (17–600 °C) during deposition were investigated in detail. Magnetic measurements were performed in the temperature range from 80 K up to 300 K. Hysteresis loop asymmetry was found at temperatures lower than 150 K for the samples with an antiferromagnetic layer thickness of more than 10 nm. The average grain size of FeMn was found to increase with the AFM layer increase, and to decrease with the substrate temperature increase. Hysteresis loop asymmetry was explained in terms of the exchange spring model in the antiferromagnetic layer.

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Держатели документа:
Research and Education Center “Smart Materials and Biomedical Applications”, Immanuel Kant Baltic Federal University, Gaidara str., 6, Kaliningrad, 236041, Russian Federation
Solid State Magnetism Department, Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, 620002, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Institute of Physics, Faculty of Science, Pavol Jozef Safarik University, Park Angelinum 9, Kosice, 040 01, Slovakia
Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057, Germany
Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, Gdansk, 80233, Poland
Materials Science and Metallurgy Shared Use Research and Development Center, National University of Science and Technology MISiS, Moscow, 119049, Russian Federation

Доп.точки доступа:
Gritsenko, C.; Lepalovskij, V.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Komanicky, V.; Gorkovenko, A.; Pazniak, H.; Gazda, M.; Andreev, N.; Rodionova, V.
}
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16.

    Иконников, Денис Андреевич.
    Получение комплексных массивов оптических вихрей с помощью бинарных фазовых голограмм / Д. А. Иконников, В. А. Фокин, А. М. Вьюнышев // XI Международная конференция по фотонике и информационной оптике : сборник научных трудов. - Москва, 2022. - С. 211-212. - Библиогр.: . - ISBN 978-5-7262-2842-6
   Перевод заглавия: Producing complex arrays of optical vortices using binary phase holograms
Рубрики:

Аннотация: Рассмотрен неитеративный подход синтеза бинарных фазовых голограмм для получения комплексных массивов оптических вихрей. Данный подход не требует выполнения обратного фурье-преобразования и позволяет получать желаемые массивы оптических вихрей с заданными топологическими зарядами. Показано, что данный метод позволяет, в том числе, получать комплексные оптические поля, содержащие структуры из оптических вихрей. Предложенный метод может найти применение для приложений, связанных с взаимодействием света с веществом, таких как оптические ловушки и оптические пинцеты.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Фокин, В. А.; Fokin V. A.; Вьюнышев, Андрей Михайлович; Vyunishev, A. M.; Ikonnikov, D. A.; Международная конференция по фотонике и информационной оптике(11 ; 2022 ; 26-28 янв. ; Москва); Российская академия наук; Национальный исследовательский ядерный университет "МИФИ"
}
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17.

Bogdanov, E. V.
Effect of deuteration on the barocaloric properties of complex vanadates (NH4)3VOxF6−x (x: 1, 2) / E. V. Bogdanov, M. V. Gorev, I. N. Flerov // Solid State Sci. - 2022. - Vol. 133. - Ст. 107022, DOI 10.1016/j.solidstatesciences.2022.107022. - Cited References: 28 . - ISSN 1293-2558
Кл.слова (ненормированные):
Fluorides -- Phase transition -- Entropy -- Barocaloric effect
Аннотация: We report on the analysis of intensive and extensive barocaloric properties and their sensitivity to deuteration of complex oxyfluorides (NH4)3VOxF6−x (x: 1, 2) undergoing a similar sequence of structural phase transitions. Due to the high sensitivity to hydrostatic pressure and the strong disordering of six-coordinated anionic fluoro-oxygen species, (NH4)3VO2F4 and (ND4)3VO2F4 crystals demonstrate the highest barocaloric efficiency at low pressure, p = 0.1 GPa, during the phase transition from the initial cubic phase: barocaloric coefficients reach large values |ΔSBCE|/p ≈ 400 J/(kg K GPa) and ΔTAD/p ≈ 80 K/GPa. Anionic, [VOF5] → [VO2F4], and cationic, [ND4] → [NH4] substitutions are accompanied by a decrease in the disorder of structural units in the cubic phase, which leads to a decrease in changes in entropy and temperature under pressure. The contribution of thermal expansion of the crystal lattice to the total intensive and extensive barocaloric effects is large and amounts to about 30–40%.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Богданов, Евгений Витальевич
}
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18.

Muzalevskiy, K. V.
Numerical-analytical model of reflection coefficient for rough soil surface in wide frequency range / K. Muzalevskiy // Proceedings - 2022 IEEE 8th All-Russian Microwave Conference, RMC 2022. - 2022. - 8th IEEE All-Russian Microwave Conference, RMC 2022 (23 - 25 November 2023, Moscow, Russian Federation) Conference code: 187597. - P. 305-308, DOI 10.1109/RMC55984.2022.10079255. - Cited References: 18. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project №22-17-20042
Кл.слова (ненормированные):
remote sensing -- radiolocation -- radiometry -- reflectometry -- reflection coefficient -- rough surface -- soils -- complex permittivity of soils -- soil moisture
Аннотация: In this work, a numerical-analytical model of reflection coefficient for rough soil surface in wide frequency band was proposed. The field of reflected wave from the rough soil surface is presented as the sum of secondary fields from an infinite set of elementary horizontal scattering plates (with a given average size). The field from each elementary scattering plate is represented as an average field from the result of stochastic interference of an infinite set of coherent elementary sources of secondary waves. The vertical position of the elementary sources is determined by the stochastic height of the soil surface within elementary plate. The case of the coherent component and the total value (coherent+diffuse components) of reflection coefficient is considered. On the basis of the created model of reflection coefficient, a broadband method for simultaneously retrieved the root-mean-square deviation of the stochastic soil surface heights and volumetric soil moisture was developed. The results have a wide application value both for single-frequency and multi-frequency radar and radiometric methods of soil moisture measuring.

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

Доп.точки доступа:
Музалевский, Константин Викторович; IEEE All-Russian Microwave Conference(8 ; 23 - 25 November 2023 ; Moscow, Russian Federation)
}
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19.

Validation of Dobson's, Schmugge's, and Mironov's dielectric models at four typical agrosoils of Krasnoyarsk and Krasnodar krais / S. Fomin, K. Muzalevskiy, A. Karavayskiy [et al.] // Proceedings - 2022 IEEE 8th All-Russian Microwave Conference, RMC 2022. - 2022. - 8th IEEE All-Russian Microwave Conference, RMC 2022 (23 - 25 November 2023, Moscow, Russian Federation) Conference code: 187597. - P. 349-352, DOI 10.1109/RMC55984.2022.10079332. - Cited References: 16. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project №22-17-20042
Кл.слова (ненормированные):
remote sensing -- soil moisture -- complex permittivity -- dielectric model -- Agriculture
Аннотация: In this article, in a wide frequency range from 300 MHz to 2 GHz at a temperature of 20C, the validation of Dobson's, Schmugge's, and Mironov's (with one, two, and three soil water relaxations) dielectric models was carried out using four samples of typical agrosoils taken from the arable layer. Variations in the clay fraction, dry bulk density, and organic matter content of soil samples ranged from 32% to 56%, from 1.1 g/cm3 to 1.7 g/cm3, up to 6.9%, respectively. It is shown that the Mironov's model with two relaxations (M2) has the best accuracy in describing the measured relative complex permittivity (RCP) spectra for all soils in average. The coefficient of determination (R2) and root-mean square error (RMSE) appeared to be equal of Rε'2=0.907 (RMSEε'=0.83) for real and Rε''2=0.960 (RMSEε'' =0.89) for imaginary parts of RCP, when comparing the measured and calculated RCPs. Error of soil moisture retrieval, based on M2 dielectric model and the observations of reflection coefficient at nadir was estimated. For four agricultural soils, it is shown that the retrieved volumetric soil moisture values with the determination coefficient R2=0.975 and RMSE =2% coincide with the true values of soil moisture. It has also been found that small inaccuracies (several tens of percent) in determining the dry bulk density and clay content of soils have practically no effect on the error in retrieving the volumetric soil moisture.

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

Доп.точки доступа:
Fomin, S. V.; Фомин, Сергей Викторович; Muzalevskiy, K. V.; Музалевский, Константин Викторович; Karavayskiy, A. Yu.; Каравайский, Андрей Юрьевич; Romanov, V.; Lipshin, A.; Mikhailets, M.; IEEE All-Russian Microwave Conference(8 ; 23 - 25 November 2023 ; Moscow, Russian Federation)
}
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20.

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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