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Role of interfaces in the permittivity tensor of thin layers of a ferromagnetic metal / S. G. Ovchinnikov, O. A. Maximova, S. A. Lyaschenko [et al.] // JETP Letters. - 2021. - Vol. 114, Is. 3. - P. 163-165, DOI 10.1134/S0021364021150066. - Cited References: 13. - This work was supported by the Russian Science Foundation, project no. 21-12-00226, http://rscf.ru/project/21-12-00226/ . - ISSN 0021-3640
Аннотация: It is known from experimental studies that the components of the permittivity tensor ε depend on layer thicknesses of multilayer thin films, and for nanometer layers, it is necessary to additionally consider the interlayer interfaces. This study provides an answer to the question of what is the reason for the influence of these interfaces on film properties. It is shown that the contribution of interband matrix elements for ferromagnetic films with off-diagonal components of the permittivity tensor determines the ratio between the diagonal and off-diagonal components of the tensor ε at a ferromagnetic layer thickness of about 10 nm.

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Публикация на русском языке Роль интерфейсов в формировании тензора диэлектрической проницаемости тонких слоев ферромагнитного металла [Текст] / С. Г. Овчинников, О. А. Максимова, С. А. Лященко [и др.] // Письма в ЖЭТФ. - 2021. - Т. 114 Вып. 3. - С. 192-195

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Maximova, O. A.; Максимова, Ольга Александровна; Lyashchenko, S. A.; Лященко, Сергей Александрович; Yakovlev, I. A.; Яковлев, Иван Александрович; Varnakov, S. N.; Варнаков, Сергей Николаевич
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Study of a composite consisting of metal nanoparticles in a dielectric matrix and multilayer bandpass filters based on it / B. A. Belyaev, An. A. Leksikov, V. V. Tyurnev, D. A. Shabanov // Dokl. Phys. - 2021. - Vol. 66, Is. 3. - P. 59-63, DOI 10.1134/S1028335821030010. - Cited References: 11. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation within a State Assignment, project no. FEFE-2020-0013 “Development of the Theory of Self-Configuring Machine Learning Algorithms for Modeling and Predicting the Characteristics of Components of Complex Systems” . - ISSN 1028-3358
Кл.слова (ненормированные):
composite -- metal nanoparticles -- complex permittivity -- bandpass filter
Аннотация: The frequency and concentration dependences of the effective complex permittivity of a composite consisting of silver nanoparticles in a polystyrene dielectric matrix have been investigated. It has been found that, with an increase in the volume concentration of particles in the composite to ~33%, the real part of its permittivity increases from 2.6 to ~103, while the loss tangent remains no higher than 10–2 up to a frequency of 1 THz. We show the possibility of designing bandpass filters based on composite layered structures, which can be tuned by selecting the particle concentration in the quarter-wavelength layers of the mirrors that ensure the optimal interaction of half-wavelength resonators with each other and the outer resonators with free space. The high contrast between the matrix and the composite permittivities makes it possible to create mirrors with a required reflectivity using a minimum number of layers.

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Публикация на русском языке Исследование композита: металлические наночастицы в диэлектрической матрице и многослойных полосно-пропускающих фильтров на его основе [Текст] / Б. А. Беляев, Ан. А. Лексиков, В. В. Тюрнев, Д. А. Шабанов // Доклады Академии наук. Физика, технические науки. - 2021. - Т. 497 № 1. - С. 5-11

Держатели документа:
Siberian State University of Science and Technology, Krasnoyarsk, 660014, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Leksikov, An. A.; Лексиков, Андрей Александрович; Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Shabanov, D. A.; Шабанов, Дмитрий Александрович
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Muzalevskiy, K. V.
Application of Sentinel-1B polarimetric observations to soil moisture retrieval using neural networks: Case study for bare Siberian chernozem soil / K. Muzalevskiy, A. Zeyliger // Remote Sens. - 2021. - Vol. 13, Is. 17. - Ст. 3480, DOI 10.3390/rs13173480. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research (grant No. 19-29-05261 mk). The field experiment and EC-5 Decagon sensor calibration in laboratory conditions were carried out with the support of Ministry of Science and Higher Education of the Russian Federation, project No. 0287-2021-0034 (basic state assignment) . - ISSN 2072-4292

РУБ Environmental Sciences + Geosciences, Multidisciplinary + Remote Sensing + Imaging Science & Photographic Technology
Рубрики:
SURFACE
   MODEL
   PARAMETERS
   ROUGHNESS
   INVERSION
   DUBOIS
   IEM
   OH
Кл.слова (ненормированные):
microwave remote sensing -- Sentinel-1 -- bare soil -- soil moisture -- soil permittivity
Аннотация: Sentinel-1 is currently the only synthetic-aperture radar, which radar measurements of the earth’s surface to be carried out, regardless of weather conditions, with high resolution up to 5–40 m and high periodicity from several to 12 days. Sentinel-1 creates a technological platform for the development of new globally remote sensing algorithms of soil moisture, not only for hydrological and climatic model applications, but also on a single field scale for individual farms in precision farming systems used. In this paper, the potential of soil moisture remote sensing using polarimetric Sentinel-1B backscattering observations was studied. As a test site, the fallow agricultural field with bare soil near the Minino village (56.0865°N, 92.6772°E), Krasnoyarsk region, the Russian Federation, was chosen. The relationship between the cross-polarized ratio, reflectivity, and the soil surface roughness established Oh used as a basis for developing the algorithm of soil moisture retrieval with neural networks (NNs) computational model. Two NNs is used as a universal regression technique to establish the relationship between scattering anisotropy, entropy and backscattering coefficients measured by the Sentinel-1B on the one hand and reflectivity on the other. Finally, the soil moisture was found from the soil reflectivity in solving the inverse problem using the Mironov dielectric model. During the field campaign from 21 May to 25 August 2020, it was shown that the proposed approach allows us to predict soil moisture values in the layer thickness of 0.00–0.05 m with the root-mean-square error and determination coefficient not worse than 3% and 0.726, respectively. The validity of the proposed approach needs additional verification on a wider dataset using soils of different textures, a wide range of variations in soil surface roughness, and moisture.

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Держатели документа:
Russian Acad Sci, Lab Radiophys Earth Remote Sensing, Kirensky Inst Phys, Fed Res Ctr KSC,Siberian Branch, Krasnoyarsk 630090, Russia.
Russian State Agr Univ, Dept Appl Informat, Moscow Timiryazev Agr Acad, Moscow 127550, Russia.

Доп.точки доступа:
Zeyliger, Anatoly; Музалевский, Константин Викторович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-29-05261 mk]; Ministry of Science and Higher Education of the Russian Federation [0287-2021-0034]
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Fomin, S. V.
A dielectric model for frozen mineral soils at a frequency of 435 MHz / S. Fomin, K. Muzalevskiy // Remote Sens. Lett. - 2021. - Vol. 12, Is. 9. - P. 944-950, DOI 10.1080/2150704X.2021.1947537. - Cited References: 16. - This work was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation [project No. 0287-2021-0034] . - ISSN 2150-704X
Кл.слова (ненормированные):
Mean square error -- Mixer circuits -- Permittivity -- Remote sensing -- Soil moisture -- Soil surveys -- Coefficient of determination -- Complex relative permittivity -- Dielectric measurements -- Practical engineering -- Retrieval algorithms -- Root mean square errors -- Spectroscopic models -- Volumetric soil moistures -- Frozen soils
Аннотация: A single frequency refractive mixing dielectric model at 435 MHz for frozen mineral soils is proposed. The model was created based on the laboratory dielectric measurements of three soil samples in the ranges of soil moisture from 0.01cm3 cm−3 to 0.42cm3 cm−3, temperature from– 30°C to– 1°C, clay content (by weight) from 9.1% to 41.3%. Coefficient of determination R2 and root mean square error (RMSE) predicted by the model and measured values for real () and imaginary () part of the complex relative permittivity (CRP) are = 0.988 (= 0.323) and = 0.987 (= 0.100). Compared to well-known spectroscopic models, this model is simpler in practical engineering use. The input parameters of the model are the volumetric soil moisture, temperature and the content of the clay fraction. The output parameters are the real and imaginary parts of the CRP. The created model may be used to develop new remote sensing retrieval algorithms of temperature, the content of unfrozen water and ice in the root zone of frozen soils for northern regions.ε 'ε ''R2ε 'RMSEε 'R2ε ''RMSEε ''

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

Доп.точки доступа:
Muzalevskiy, K. V.; Музалевский, Константин Викторович; Фомин, Сергей Викторович
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Muzalevskiy, K. V.
Shielded open-circuited probe for in-situ measurements of soil permittivity in Very high frequency (VHF) and Ultra high frequency (UHF) bands / K. Muzalevskiy, A. Karavaysky // Trans. Inst. Meas. Control. - 2021. - Vol. 43, Is. 16. - P. 3566-3572, DOI 10.1177/01423312211037791. - Cited References: 30. - The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the SB RAS project No. 0287-2021-0034 . - ISSN 0142-3312. - ISSN 1477-0369

РУБ Automation & Control Systems + Instruments & Instrumentation
Рубрики:
DIELECTRIC CHARACTERIZATION
MOISTURE
Кл.слова (ненормированные):
Soil measurements -- dielectric spectroscopy -- frequency domain reflectometry -- complex permittivity -- shielded open-circuited probe
Аннотация: In this paper, the shielded open-circuited probe operating in the wide frequency range from 75MHz to 2GHz is proposed. The probe is made of an SubMiniature version A (SMA) flange connector. The central rod of the SMA connector emerges from a coaxial transition in the flange and shielded by four rods. The robe design allows us to calculate of the probe reflection coefficient S11 used simple analytical transmission line model (TEM wave mode), the parameters of which were calibrated on a set of substances with a known frequency spectrum of permittivity. The refractive index (RI) and normalized attenuation coefficient (NAC) retrieval technique is based on solving the inverse problem of minimizing the residual norm between measured and calculated frequency spectra of reflection coefficient S11. After calibration, the root-mean-square error (determination coefficient) between the measured and calculated module and phase of the reflection coefficient S11 for the sets of calibration media air, distilled water, butanol, pure ice, water solution with NaCl of salinity of 8.9% do not exceed 0.26dB (0.995) and 0.03 rad (0.999), respectively, in the frequency range from 75MHz to 2GHz. The root-mean-square error (determination coefficient) between the measured RI and NAC spectra for four soil cover samples (variation of the clay fraction from 10.5 g/g to 47.6 g/g) using the proposed probe and a precision coaxial cell not exceeds 0.109 (0.993) and 0.057 (0.986), respectively, in the frequency range from 75 MHz to 2 GHz. As a result, it is experimentally shown that RI и NAC can be measured by the proposed non-precision probe with an error comparable to the precision coaxial cell.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC, Siberian Branch, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Karavaysky, A. Yu.; Каравайский, Андрей Юрьевич; Музалевский, Константин Викторович; SB RAS project [0287-2021-0034]
}
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The Effect of Clay and Organic Mat ter Content on the Dielectric Permittivity of Soils and Grounds at the Frequency Range From 10 Mhz to 1 Ghz [Text] / Bobrov P.P.Mironov V.L. [et al.] // Proceedings IGARSS. - 2010. - P4433-4435

Доп.точки доступа:
Bobrov, P.P.; Mironov, V.L.; Kondratyeva, O.V.; Repin, A.V.
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Influence of Temperature and Humidity on Resistance and Permittivity of Composite Films of WO3 and B2O3 with Fullerene / Dudnik A.I., Bogdanova A.V. // 11th Annual International Conference and Seminar on Micro/Nanotechnologies and Electron Devices, EDM'2010 : proceedings : IEEE, 2010. - P106-108. - (978-1-4244-6626-9)DOI 10.1109/EDM.2010.5568647
Аннотация: The paper represents dependences of electrical resistance on irradiance and temperature for composite fullerene-WO3 films. It has been shown that the structure film-contacts is more sensitive to external influence when the film is placed between contacts. Dependencies of fullerene doped B2O3 films permittivity on temperature and humidity are given. Introduction of fullerenes results in approximately linear temperature dependence of permittivity

Материалы конференции

Доп.точки доступа:
Dudnik, A. I.; Дудник, Александр Иванович; Bogdanova A.V.; International Conference and Seminar on Micro/Nanotechnologies and Electron Devices(11 ; 2010 ; June 30 - July 4 ; Novosibirsk, Russia)
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Orientational ordering of tree elements in the dielectric permittivity model of a forest stand / A. V. Sorokin, V. G. Podoprigora, D. S. Makarov [et al.] // Russ. Phys. J. - 2020. - Vol. 63, Is. 2. - P. 238-243, DOI 10.1007/s11182-020-02026-2. - Cited References: 8 . - ISSN 1064-8887. - ISSN 1573-9228

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
dielectric permittivity -- orientational ordering tensor -- anisotropy -- signals of navigation satellites
Аннотация: The dielectric characteristics of trees are studied for a dielectric permittivity model of a forest stand of L1 band signals of navigation satellites. The contribution of the orientational ordering of tree elements and of the wood anisotropy to the effective wood dielectric permittivity epsilon has been estimated. The crown layer has the height-depend anisotropy increment epsilon and the orientational ordering of branch tensor elements. The anisotropy gradients in the layer of trunks are determined by the height-dependent wood volume of a single tree and the tree height distribution in a large forest.

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Публикация на русском языке Ориентационная упорядоченность элементов дерева в модели диэлектрической проницаемости древостоя [Текст] / А. В. Сорокин, В. Г. Подопригора, Д. С. Макаров [и др.] // Изв. вузов. Физика. - 2020. - Т. 63 № 2. - С. 50-54

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
MF Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk, Russia.

Доп.точки доступа:
Sorokin, A. V.; Сорокин, Анатолий Васильевич; Podoprigora, V. G.; Подопригора, Владимир Георгиевич; Makarov, D. S.; Kharlamov, D. V.; Baltice, V. V.
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    Disorder and phase transitions in oxyfluoride (NH4)(3)Ta(O-2)(2)F-4 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2011. - Vol. 132, Is. 10. - P. 713-718, DOI 10.1016/j.jfluchem.2011.05.012. - Cited Reference Count: 19. - Гранты: This work was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). - Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2] . - ISSN 0022-1139
Рубрики:
HEAT-CAPACITY
   COMPLEXES
   RB2KTIOF5
   FLUORIDES
   CRYOLITE
Кл.слова (ненормированные):
cubic oxyfluorides -- structural disorder -- phase transitions -- entropy -- permittivity -- pressure effect -- cubic oxyfluorides -- entropy -- permittivity -- phase transitions -- pressure effect -- structural disorder
Аннотация: Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)(3)Ta(O-2)(2)F-4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. (C) 2011 Elsevier By. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
RAS, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
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10.

The Web Site for Retreaving the Microwave Complex Permittivity Spectra of Moist Soils / V. L. Mironov, S. V. Fomin, L. G. Kosolapova, A. M. Epikhin // Proc. PIER. - 2011. - P581-584

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Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Fomin, S. V.; Фомин, Сергей Викторович; Kosolapova, L. G.; Косолапова, Людмила Георгиевна; Epikhin, A. M.; Епихин, Андрей Михайлович; Progress In Electromagnetics Research Symposium(2011 ; Sept. 12-16 ; Suzhou, China)
}
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