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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Миронов, Валерий Леонидович, Каравайский, Андрей Юрьевич, Лукин, Юрий Иванович, Погорельцев, Евгений Ильич
Заглавие : Диэлектрический метод измерения скрытой теплоты плавления льда при оттаивании мерзлой почвы
Место публикации : Журн. радиоэлектрон.: электронный журнал. - 2018. - № 12. - Ст.14. - ISSN 1684-1719, DOI 10.30898/1684-1719.2018.12.14
Примечания : Библиогр.: 14
Ключевые слова (''Своб.индексиров.''): диэлектрическая модель--диэлектрическая проницаемость--мерзлые почвы--незамерзшая вода--незамерзающая вода--связанная вода--фазовые переходы--дифференциальная сканирующая калориметрия--dielectric model--dielectric constant--frozen soil--unfrozen water--nonfreezable water--bound water--phase transitions--differential scanning calorimetry
Аннотация: Проведены экспериментальные исследования изменения массы незамерзшей воды, содержащейся в мерзлой Nа-бентонитовой глине в диапазоне температур от -30 до 0 °C и диапазоне массовых влажностей от 0 до 1 г/г с помощью диэлектрического метода. Предложен калориметрический метод измерения удельной скрытой теплоты плавления льда в связанную и несвязанную воду при нагревании мерзлой почвы. Предложен метод измерения скрытой теплоты плавления льда в мерзлой почве в процессе нагревания методом диэлектрических измерений. С целью обоснования предложенной методики проведено сравнение скрытой теплоты плавления льда при нагревании бентонитовой глины, полученной методом дифференциальной сканирующей калориметрии (ДСК), с рассчитанной с помощью диэлектрического метода.Experimental studies of the change in the mass of unfrozen water contained in frozen Na-bentonite clay in the temperature range from -30 to 0 °C and a gravimetric moistures range from 0 to 1 g/g have been carried out by the dielectric method. The calorimetric method is proposed for measuring the specific latent heat of fusion of ice into bound and unbound water when the frozen soil is heated. The method of dielectric measurements is proposed for measuring the latent heat of fusion of ice in frozen soils during heating. In order to substantiate the proposed technique, the latent heat of fusion of ice in frozen bentonite clay measured by the differential scanning calorimetry during heating was compared with this value obtained by the dielectric method.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Kosolapova L. G., Fomin S. V., Savin I. V.
Заглавие : Experimental analysis and empirical model of the complex permittivity of five organic soils at 1.4 GHz in the temperature range from −30 °C to 25 °C
Место публикации : IEEE Trans. Geosci. Remote Sensing. - 2019. - Vol. 51, Is. 6. - P.3778 - 3787. - ISSN 0196-2892, DOI 10.1109/TGRS.2018.2887117
Примечания : Cited References: 26. - This work was supported by the Russian Foundation for Basic Research under Grant 16-05-00572.
Аннотация: The dielectric measurements were made for five organic soils taken from the tundra territories of Alaska, Yamal, and Taimyr, with the content of organic matter varying from 35% to 80%. The measurements were carried out in the temperature range from −30 °C to 25 °C, frequencies from 0.45 to 16 GHz and soil moisture from close to zero to the field moisture capacity. The refractive mixing model was applied to fit the measurements of the soil’s complex refractive index (CRI) as a function of soil moisture, with the values of temperature being fixed. As a result, a respective dielectric model was developed. The amounts of bound and transient water in the thawed and frozen soils were introduced as parameters of the developed model and derived as a function of temperature and content of soil organic matter. The other parameters which concern the CRIs of soil solids as well as bound, transient, and liquid soil water or ice components were derived as a function of temperature. The errors of the proposed model estimated in terms of the values of normalized root-mean-sqaure error for the real and imaginary parts of the soil complex relative permittivity appeared to be 6%–7% and 23%, respectively. The proposed dielectric model can be applied in active and passive remote sensing, in particular, for the SMOS, SMAP, and Aquarius missions after testing in ground-based experiments.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Yashchenko A. S., Bobrov P. P., Mironov V. L.
Заглавие : The use of navigation satellites signals for measurement the absorbance of the forest canopy
Коллективы : Progress in Electromagnetics Research Symposium - Spring 2017 , Russian Foundation for Basic Research [16-35-50182 mol_nr]
Место публикации : Progress in Electromagnetics Research Symposium - Spring: IEEE, 2017. - P.1227-1231. - ISBN 978-1-5090-6269-0, DOI 10.1109/PIERS.2017.8261936
Примечания : Cited References:5. - This research was supported by the Russian Foundation for Basic Research, project 16-35-50182 mol_nr.
Аннотация: The results of measurement of the electromagnetic wave attenuation by the forest canopy at L-band are presented. The soil moisture mapping with reasonable accuracy in a global scale is only possible using the data of satellite radiometers at L-band frequency (SMOS and SMAP remote sensing programs). In the process of soil moisture retrieval from remote sensing data it is necessary to know the state of ecosystems on the Earth's surface. Forests are one of the dominant terrestrial ecosystems of Earth covering a large area of the surface. The attenuation coefficient of the forest canopy has high value even at L-band frequency. In the absence of forest canopy attenuation data the error of retrieval of the soil moisture for woodlands areas will have very high values. For this reason the emissivity model of Earth surface needs a priory data of the emissive and attenuate properties of the forest cover. One of methods of measurement of forest canopy attenuation coefficient at L-band frequency is using the signals of Global Navigation Satellite System (GNSS). Measurement showed that for elevation angle of 50 and 35 degrees the attenuation has a value range of -6 -10 dB and -10 -15 dB respectively. This makes it possible to claim that under certain conditions the soil radiothermal emission can make a noticeable contribution to the overall emission of surface covered forest. The results obtained in the measurement can be used in SMOS and SMAP sub-pixel data processing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Музалевский, Константин Викторович, Михайлов, Михаил Иванович
Заглавие : Измерение влажности и температуры почвы на основе интерференционного приёма линейно-поляризованных сигналов ГЛОНАСС и GPS
Место публикации : Совр. пробл. дистан. зондир. Земли из космоса. - 2018. - Т. 15, № 4. - С. 155-165. - ISSN 20707401 (ISSN), DOI 10.21046/2070-7401-2018-15-4-155-165
Примечания : Библиогр.: 18. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований (проекты No 18-05-00405, 0356-2018-0060), а также Программы II.12.1. «базовых» фундаментальных исследований СО РАН.
Ключевые слова (''Своб.индексиров.''): глобальные навигационные спутниковые системы--глонасс--gps--рефлектометрия--влажность почвы--температура почвы--сельскохозяйственные почвы--арктические тундровые почвы--global navigation satellite systems--glonass--gps--reflectometry--soil moisture--soil temperature--agricultural soils--arctic tundra soils
Аннотация: В данной работе представлены результаты теоретического исследования возможностей дистанционного зондирования влажности талой сельскохозяйственной, влажности и температуры мёрзлой тундровой почв на основе измерения отношения коэффициентов отражения линейно-поляризованных волн (поляризационный индекс) из интерференционных диаграмм сигналов ГЛОНАСС и GPS, регистрируемых вблизи поверхности Земли на частотах 1,2 и 1,6 ГГц. В приближении метода Кирхгофа оценены диапазоны углов возвышения спутников над горизонтом (0–55°), в пределах которых существенна доля когерентной составляющей над диффузной при рассеянии в зеркальном направлении сигналов ГЛОНАСС и GPS шероховатой поверхностью почвенного покрова. В ходе решения прямой задачи моделировался «измеренный» поляризационный индекс отражённых волн (с добавлением случайной величины, распределённой по нормальному закону) на двух частотах 1,2 и 1,6 ГГц с использованием типичных профилей влажности и температуры естественно сложенных почв. Показано, что поляризационный индекс недостаточно чувствителен для восстановления слоистой структуры влагосодержания в талой и температуры в мёрзлой почвах на фоне шумов (1,5–2 дБ) регистрируемых интерференционных диаграмм. Обратная задача по восстановлению влажности и температуры почвы из «измеренного» поляризационного индекса решалась в приближении диэлектрически-однородного почвенного полупространства. Показано, что для всех рассмотренных профилей вне зависимости от используемой частоты сигналов максимальная погрешность восстановления влажности и температуры почвы не превышает 0,03 см3/см3 и 1 °С относительно соответствующих средних величин, рассчитанных для поверхностного слоя почвы 1 см.This paper presents the results of a theoretical study of the potential for remote sensing of moisture of agricultural thawed soil, moisture and temperature in tundra frozen soil based on measurement of the ratio between reflection coefficients on linear-orthogonal polarizations (polarization index) from the interference patterns of GLONASS and GPS signals recorded near the Earth's surface at frequencies of 1.2 and 1.6 GHz. The ranges of satellites elevation angles within which the coherent component exceeds the diffuse part in the mirror scattering of GLONASS and GPS signals by the surface roughness were estimated by Kirchhoff's method. In the course of solving the direct problem, the "measured" polarization index of reflected waves was simulated (with addition of a random variable distributed according to the normal law) at two frequencies of 1.2 and 1.6 GHz using typical moisture and temperatures profiles of soils. It is shown that the polarization index is not sensitive enough to retrieve the layered structure of moisture in thawed and temperature profile in frozen soil, against the background noise (1.5-2 dB) of the recorded interference diagrams. The inverse problem of soil moisture and soil temperature retrieval from the "measured" polarization index was solved in the approximation of dielectrically-homogeneous half-space. It is shown that for all the profiles examined, regardless of frequency of GNSS signals, the maximum error in soil moisture and soil temperature retrieval does not exceed 0.03 cm3/cm3 and 1 °C, relative to the corresponding average values calculated for the topsoil of 1 cm.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Burmitskikh A. V., Boev N. M., Izotov A. V., Andyuseva V. G.
Заглавие : Automated measuring unit for analysis of thin magnetic film ferroresonance spectrum
Коллективы : International Siberian Conference on Control and Communications
Место публикации : International Siberian Conference on Control and Communications, SIBCON 2019: Proceedings: IEEE, 2019. - Ст.8729594. - , DOI 10.1109/SIBCON.2019.8729594
Примечания : Cited References: 6
Аннотация: This paper considers hardware and software for automated analysis of thin magnetic film ferroresonance spectrum to determine the rate of growth and decrease in ferroresonance spectrum (conversion factor parameter). The measuring element of automated system is the strip line which is short-circuited. The measuring unit is used to study Ni 80 Fe 20 permalloy films, with thickness of more than 300 Å. Conversion factor, magnetic permeability μ, uniaxial magnetic anisotropy, ferromagnetic spectrum resonance line width, saturation magnetization are analyzed from 50 MHz to 2 GHz frequency range. The magnetic films are used to design frequency selective filters, phase shifters and weak-field magnetic sensors. The thin magnetic film sensors are high sensitive magnetometers, with wide frequency range, low dimensions and weight [1]. © 2019 IEEE.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Interaction between dielectric particles enhances the Q factor.
Коллективы : International Conference on Metamaterials and Nanophotonics
Место публикации : International Conference on Metamaterials and Nanophotonics (4 ; 2019 ; 15 - 19 July ; St. Petersburg, Russian Federation). Journal of Physics: Conference Series. - 2020. - Vol. 1461, Is. 1. - Ст.012144. - , DOI 10.1088/1742-6596/1461/1/012144
Примечания : Cited References: 22. - This work was supported by Russian Science Foundation through Grant 19-02-00055. A. S. thanks A. Bogdanov for numerous and fruitful discussions
Аннотация: We consider resonant modes of two dielectric identical particles which can be classified as symmetric and anti symmetric combinations of the resonant modes of individual particles. We show that an approaching of two particles gives rise to an avoided crossing of resonant poles because of interaction between the disks. That in turn results in strong enhancement of the quality factor factor of two disks compared to isolated disks.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sidorenko M. S., Sergaeva O. N., Sadrieva Z. F., Roques-Carmes C., Muraev P. S., Maksimov D. N., Bogdanov A. A.
Заглавие : Observation of an accidental bound state in the continuum in a chain of dielectric dIsks
Место публикации : Phys. Rev. Appl. - 2021. - Vol. 15, Is. 3. - Ст.034041. - ISSN 23317019 (ISSN), DOI 10.1103/PhysRevApplied.15.034041
Примечания : Cited References: 58. - The authors acknowledge Almas Sadreev for fruitful discussions. M.D.N. acknowledges financial support from the Government of the Russian Federation through the ITMO Fellowship and Professorship Program and thanks ITMO University for hospitality. C.R.-C. acknowledges funding from the MIT MISTI-Russia Program. This work is supported by the Russian Foundation for Basic Research (Grants No. 19-02-00419 and No. 20-52-12062), the grant of the President of the Russian Federation (MK-2224.2020.2), and the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
Аннотация: Being a general wave phenomenon, bound states in the continuum (BICs) appear in acoustic, hydrodynamic, and photonic systems of various dimensionalities. Here, we report the first experimental observation of an accidental electromagnetic BIC in a one-dimensional periodic chain of coaxial ceramic disks. We show that the accidental BIC manifests itself as a narrow peak in the transmission spectra of the chain placed between two loop antennas. We demonstrate a linear growth of the radiative quality factor of the BICs with the number of disks that is well described with the developed tight-binding model. We estimate the number of disks when the radiation losses become negligible in comparison to material absorption and, therefore, the chain can be considered as practically infinite. The presented analysis is supported by near-field measurements of the BIC profile. The obtained results provide useful guidelines for practical implementations of structures with BICs opening up horizons for the development of radio-frequency and optical metadevices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vazhenina I. G., Chekanova L. A., Iskhakov R. S.
Заглавие : Spin-Wave Resonance Detection of Nanostructured Magnetic Alloy Inhomogeneities, Using the Example of Co–P and Co–Ni Planar Systems
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 6. - P.713-715. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819060364
Примечания : Cited References: 12. - The reported study was funded by the Russian Foundation for Basic Research, the Government of Krasnoyarsk Krai, and the Krasnoyarsk Regional Fund of Science as part of research project no. 18-42-243005 “Synthesis and Investigation of Magnetic Properties of Gradient Materials Characterized by a Predetermined Type of the Magnetic Parameter Change.”
Аннотация: Inhomogeneous layered magnetic thin films of amorphous and nanocrystalline Со–Р and Co–Ni alloys are studied via spin-wave resonance. It is found that the formation of a magnetic potential profile specified over the coating thickness leads to characteristic modifications of the spin-wave resonance spectrum. Another important factor that determines the type of modification is the dominant magnetic parameter (the constant of magnetization or exchange coupling).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Vetrov S. Ya., Timofeev I. V.
Заглавие : Transparent conductive oxides for the epsilon-near-zero Tamm plasmon polaritons
Место публикации : J. Opt. Soc. Am. B. - 2019. - Vol. 36, Is. 10. - P.2817-2823. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.36.002817
Примечания : Cited References: 44. - The reported study was funded by RFBR according to the research project No 18-32-00053 and financial support RFBR and MOST according to the research project No 19-52-52006.
Аннотация: We demonstrate the possibility of using transparent conducting oxides [aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), indium tin oxide (ITO)] to form Tamm plasmon polaritons in the near-infrared spectral range where the permittivity of oxides is near zero. The spectral properties of the structures are investigated in the framework of the temporal coupled-mode theory and confirmed by the transfer matrix method. It is found that in the critical coupling conditions, the maximal Q-factor of a Tamm plasmon polariton is achieved when a photonic crystal is conjugated with the AZO film, while at the conjugation with the ITO films, the broadest spectral line is obtained. The sensitivity of the wavelength and spectral width of the Tamm plasmon polariton to changes in the oxide film thickness, bulk concentration of a dopant, and angle of incidence is demonstrated.
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10.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Babitskii A. N., Belyaev B. A., Boev N. M., Izotov A. V.
Заглавие : Low noise wideband thin-film magnetometer
Коллективы : IEEE International Conference "Sensors"
Место публикации : Proceedings of IEEE Sensors. - 2017. - Vol. 2017-December: 16th IEEE SENSORS Conference, ICSENS 2017 (30 October 2017 through 1 November 2017, Glasgow, UK) Conference code: 132067. - P.1-3. - , DOI 10.1109/ICSENS.2017.8233972
Примечания : Cited References: 4. - This work was supported by the Ministry of Education and Science of the Russian Federation, Task no. 3.1031.2017/PCh.
Ключевые слова (''Своб.индексиров.''): magnetic sensor--magnetometer--magnetic field measurement--thin magnetic film
Аннотация: A novel low noise and wide bandwidth thin magnetic film magnetometer based on a ferromagnetic resonance phenomenon is presented in the article. The magnetometer is characterized by a high sensitivity in a wide frequency range - from a direct component of the field and up to 105...108 Hz. The magnetometer noise level is lower 10-12 T/Hz1/2 at frequencies above 102 Hz. The magnetometer conversion factor is constant at the whole operating frequency band. The developed magnetometer is simple and inexpensive for mass production.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Киренский, Леонид Васильевич, Ветер В. В.
Заглавие : Изменение ширины граничного слоя в ферромагнетиках с помощью магнетооптического эффекта Керра
Место публикации : Журн. эксперим. и теор. физ. - 1958. - Т. 35, вып. 3. - С. 819
Примечания : Phys. Abstr. - 1960. - Vol. 63, 3039
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Muzalevskiy K. V., Ruzicka Z.
Заглавие : Retrieving profile temperatures in a frozen topsoil near the TFS, Alaska, based on SMOS brightness temperatures at the 1.4-GHz frequency
Коллективы : Russian Science Foundation [4-17-00656]
Место публикации : IEEE Trans. Geosci. Remote Sensing/ funding agency: IEEE-Institute Electrical and Electronics Engineers, 2016. - Vol. 54, Is. 12. - P.7331-7338. - ISSN 0196-2892, DOI 10.1109/TGRS.2016.2599272. - ISSN 1558-0644(eISSN)
Примечания : Cited References:25. - This work was supported by the Russian Science Foundation through Project 4-17-00656.
Предметные рубрики: DIELECTRIC MODEL
ARCTIC SOIL
SURFACE
BOREAL
TUNDRA
GHZ
Ключевые слова (''Своб.индексиров.''): microwave radiometry--remote sensing--soil measurements--temperature--measurement
Аннотация: In this paper, the method previously proposed in earlier work for measuring the temperature profile in a frozen topsoil using multiangular brightness temperature observations in the L-band has been experimentally tested. At a frequency of 1.4 GHz, full-polarization multiangular brightness temperature data were obtained from the Soil Moisture and Ocean Salinity (SMOS) satellite land product of Level 1C, with the SMOS footprint being centered at the Toolik Field Station (TFS), Alaska. The SMOS data covered the period from January 1, 2010 to December 31, 2011. Retrieval of the temperature profiles in a frozen topsoil was based on the semiempirical emission model L-MEB and the temperature-dependent dielectric model for an organic-rich tundra soil. The soil samples measured to develop the dielectric model were collected at the TFS site. For winter seasons, the retrieved temperature profiles in the 16.0-cm topsoil were validated relative to the temperature profiles measured in situ. As a result, the values of root-mean-square error and determination coefficient of the temperatures retrieved at the depths of 0.6, 8.7, and 16.0 cm, relative to the respective temperatures measured in situ, were found to be 2.8 °C, 4.9 °C, and 6.4 °C and 0.62, 0.42, and 0.26, respectively. The sources of error and possible improvements of the proposed retrieving algorithm were discussed. The major result of this study is the demonstration of the potential possibility for remote sensing of the temperature profile in a frozen arctic topsoil using the SMOS multiangular brightness data.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Falaleev O. V., Kriger A. I., Sukhovskii A. A., Moskvich Yu. N.
Заглавие : Measurement of the anisotropy of weak indirect interaction between magnetic nuclei in cesium tgse
Место публикации : Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 6. - P.1853-1857. - ISSN 0367-3294
Примечания : Cited References: 12
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Muzalevskiy K. V., Ruzicka Z.
Заглавие : Retrieving soil temperature at a test site on the yamal peninsula based on the SMOS brightness temperature observations
Коллективы : IEEE International Geoscience and Remote Sensing Symposium
Место публикации : IEEE J. Sel. Top. Appl. Earth Observ. Remote Sens.: IEEE-Institute Electrical and Electronics Engineers, 2016. - Vol. 9, Is. 6. - P.2468-2477. - ISSN 1939-1404, DOI 10.1109/JSTARS.2016.2553220. - ISSN 2151-1535(eISSN)
Примечания : Cited References:36
Предметные рубрики: MICROWAVE DIELECTRIC MODEL
LAND-SURFACE TEMPERATURES
ARCTIC SOIL
Ключевые слова (''Своб.индексиров.''): arctic regions--microwave radiometry--moisture measurement--soil--measurements--temperature measurement
Аннотация: In this paper, the results of radiothermal remote sensing of soil temperature at a test site on the Yamal Peninsula using full-polarimetry multiangular brightness temperature (BT) observations at the frequency of 1.4 GHz are presented. The BT data were obtained from the Soil Moisture and Ocean Salinity (SMOS) satellite with the SMOS footprint near the Polar Weather Station Marresale, the Russia Federation. The SMOS data covered the period from January 1, 2013 to December 31, 2013. The method to retrieve the soil temperature was based on solving an inverse problem by minimizing the norm of the residuals between the observed and predicted values of the BTs. The calculation of the BT was performed using a semiempirical model of radiothermal emission, which incorporated an attenuation of the microwaves in the snow pack or the canopy and a temperature-dependent multirelaxation spectral dielectric model (TD MRSDM) for an organic-rich tundra soil. The TD MRSDM was specifically designed based on laboratory measurements of the complex permittivity of the organic-rich soil samples, which were collected at the test site on the Yamal Peninsula. As a result, the values of the root-mean-square error and the determination coefficient between the retrieved and measured soil temperatures were determined to be 2.2 degrees C and 0.70 and 3.5 degrees C and 0.52, respectively, for thawed frozen soil. These results indicate the perspectives of using the full-polarimetric multiangular BT observations in the L-band for the purpose of measuring the soil temperature in the Arctic region.
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15.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Muzalevskiy K. V., Ruzicka Z., Kosolapova L. G., Mironov V. L.
Заглавие : Temperature dependence of SMOS/MIRAS, GCOM-W1/AMSR2 brightness temperature and ALOS/PALSAR radar backscattering at arctic test sites
Коллективы : Progress in Electromagnetics Research Symposium
Место публикации : Progr. Electromag. Res. Symp. (PIERS): Proceedings. - 2016. - P.3578-3582. - , DOI 10.1109/PIERS.2016.7735375
Примечания : Cited References: 9. - The study was supported by a grant from the Russian Science Foundation (project No. 14-17-00656) (results consigning SMOS and ALOS PALSAR data). ALOS PALSAR data was acquired in framework of the 4th ALOS Research Announcement, project No. 1422. Results consigning GCOM-W1 data were acquired in framework of the Ministry of Education of the Russian Federation No. 2.914.2014/K, and program of II.12.1. SB RAS.
Предметные рубрики: SURFACE-TEMPERATURE
BOREAL
Ключевые слова (''Своб.индексиров.''): atmospheric humidity--atmospheric temperature--backscattering--luminance--radar--soils--temperature--temperature distribution--backscattering coefficients--brightness temperatures--empirical relationships--radar backscattering--radar backscattering coefficient--soil surface temperatures--soil temperature--temperature dependence--radar measurement
Аннотация: In this study we investigated correlations between soil temperature and radar backscattering coefficient (HH-pol) measured by the ALOS PALSAR at the frequency of 1.26 GHz, and brightness temperatures measured by SMOS/MIRAS (viewing angle 55°, V-pol) at the same frequency and GCOM-W1/AMSR2 (V-pol) in the range of frequencies from 6.9 GHz to 18.7 GHz near Vaskiny Dachi weather station (70.2955N, 68.8835E) over the territory of the Yamal Peninsula. Empirical relationships between brightness temperature, backscattering coefficient and soil temperature have been found, which allow to predict the soil surface temperature on the test site from GCOM-W1 and ALOS PALSAR measurements.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Миронов, Валерий Леонидович, Музалевский, Константин Викторович, Ружичка, Зденек
Заглавие : Микроволновый радиометрический метод измерения температуры поверхности почвы арктической тундры
Место публикации : Совр. пробл. дистан. зондир. Земли из космоса. - Москва: ИКИ РАН, 2017. - Т. 14, Вып. 2. - С. 67-71. - ISSN 20707401 (ISSN), DOI 10.21046/2070-7401-2017-14-2-61-71
Примечания : Библиогр.: 22
Ключевые слова (''Своб.индексиров.''): микроволновая радиометрия--температура почвы--арктическая зона--microwave radiometry--soil measurements--temperature measurement--arctic region
Аннотация: В данной работе представлены результаты дистанционного зондирования температуры почвенного покрова на тестовом участке п-ва Ямал с использованием угловых зависимостей радиояркостной температуры, наблюдаемых космическим аппаратом SMOS на частоте 1,4 ГГц. Расположение пикселя зондирования космического аппарата SMOS было выбрано в районе между метеостанциями Марресале и Васькины дачи на п-ве Ямал. Исследование охватывает период с 22 октября 2012 г. по 10 мая 2014 г. для мерзлого состояния почвенного покрова. Метод восстановления температуры почвы основан на решении обратной задачи путем минимизации нормы невязки между наблюдаемыми и рассчитанными значениями радиояркостной температуры. Расчет радиояркостной температуры производился с использованием полуэмпирической модели, учитывающей затухание волны в снежном покрове, диэлектрическую проницаемость почвенного покрова, на основе модели комплексной диэлектрической проницаемости почвы с высоким содержанием органического вещества. Модель комплексной диэлектрической проницаемости почвенного покрова была создана в лабораторных условиях с использованием методов диэлектрической спектроскопии с использованием почвенных образцов отобранных на тестовом участке п-ва Ямал. Среднеквадратическое отклонение и коэффициент детерминации между восстановленными и измеренными значениями температуры почвы оказались равны 4,5°С и 0,59 соответственно. Полученный результат указывает на перспективность использования поляриметрических угловых наблюдений радиояркостной температуры на частоте 1,4 ГГц для измерения температуры арктической тундровой почвы.In this paper, the results of radiothermal remote sensing of soil temperature at a test site on the Yamal Peninsula using full-polarimetry multi-angular brightness temperature (BT) observations at the frequency of 1.4 GHz are presented. The BT data were obtained from the Soil Moisture and Ocean Salinity (SMOS) satellite with the SMOS footprint near the Polar Weather Station Marresale and Vaskiny Dachi, the Russian Federation. The SMOS data covered the period from October 22, 2012 to May 10, 2014. The method to retrieve the soil temperature was based on solving an inverse problem by minimizing the norm of the residuals between the observed and predicted values of BT. The calculation of BT was performed using a semi-empirical model of radiothermal emission which incorporated an attenuation of microwaves in snow pack and a temperature-dependent multi-relaxation spectral dielectric model (TD MRSDM) for organic-rich tundra soil. The TD MRSDM was specifically designed on the base of laboratory measurements of complex permittivity of organic-rich soil samples collected at the test site on the Polar Weather Station Marresale. As a result, in case of frozen soil, the values of root-mean-square error (RMSE) and determination coefficient between the retrieved and measured soil temperatures were determined to be 4.5°C and 0.59, respectively. These results indicate the perspectives of using full-polarimetric multi-angular BT observations in the L-band for the purpose of measuring soil temperature in the Arctic region.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakomirnyi V. I., Rasskazov I. L., Gerasimov V. S., Ershov A. E., Polyutov S. P., Karpov S. V.
Заглавие : Refractory titanium nitride two-dimensional structures with extremely narrow surface lattice resonances at telecommunication wavelengths
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2017. - Vol. 111, Is. 12. - Ст.123107. - ISSN 00036951 (ISSN), DOI 10.1063/1.5000726
Примечания : Cited References: 54. - This work was supported by the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. Numerical calculations were performed using the MVS-1000M system at the Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): bandwidth--nanoparticles--nanostructures--optical properties--plasmons--q factor measurement--refractory materials--titanium compounds--diffractive grating--electromagnetic response--localized surface plasmon--low cost fabrication--plasmonic nanoparticle--telecommunication bandwidth--telecommunication wavelengths--two-dimensional structures--titanium nitride
Аннотация: Regular arrays of plasmonic nanoparticles have brought significant attention over the last decade due to their ability to support localized surface plasmons (LSPs) and exhibit diffractive grating behavior simultaneously. For a specific set of parameters (i.e., period, particle shape, size, and material), it is possible to generate super-narrow surface lattice resonances (SLRs) that are caused by interference of the LSP and the grating Rayleigh anomaly. In this letter, we propose plasmonic structures based on regular 2D arrays of TiN nanodisks to generate high-Q SLRs in an important telecommunication range, which is quite difficult to achieve with conventional plasmonic materials. The position of the SLR peak can be tailored within the whole telecommunication bandwidth (from ≈ 1.26 μm to ≈ 1.62 μm) by varying the lattice period, while the Q-factor is controlled by changing nanodisk sizes. We show that the Q-factor of SLRs can reach a value of 2 × 103, which is the highest reported Q-factor for SLRs at telecommunication wavelengths so far. Tunability of optical properties, refractory behavior, and low-cost fabrication of TiN nanoparticles paves the way for manufacturing cheap nanostructures with extremely stable and adjustable electromagnetic response at telecommunication wavelengths for a large number of applications.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Serzhantov A., Leksikov Al. A., Bal'va Y. F., Leksikov An. A.
Заглавие : High-quality compact interdigital microstrip resonator and its application to bandpass filter
Место публикации : Prog. Electromagn. Res. C: Proceedings. - 2017. - Vol. 72. - P.91-103. - ISSN 19378718 (ISSN)
Примечания : Cited References: 27
Ключевые слова (''Своб.индексиров.''): alumina--bandpass filters--bandwidth--microwave filters--q factor measurement--resonators--alumina substrates--central frequency--fractional bandwidths--interdigital structures--its applications--microstrip resonator--number of fingers--unloaded quality factors--microstrip filters
Аннотация: A compact microstrip resonator based on the interdigital structure is proposed. The resonator has several times higher unloaded quality factor compared to similar resonators presented previously and can even reach the Q-factor of a regular λ/4 resonator. The size of the resonator can be significantly reduced with a substantial increase in quality factor by incrementing the number of fingers in the interdigital structure. In addition, for each gap between the fingers, there exist an optimal number of fingers that correspond to the maximum Q-factor. An extension of the upper stopband for a bandpass filter designed using the resonator can be achieved by the interconnection of the fingers in each of the comb structures. The simulation results are proven by fabricated resonators and a fourpole bandpass filter. For the central frequency of 2000 MHz and 16.2% fractional bandwidth, the lateral size of the filter is only 11.5mm × 3.8 mm for alumina substrate (eps = 9.8). The filter has an upper stopband up to 5.8f0 at the level −40 dB.
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19.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Mironov V. L., Karavaysky A. Yu., Molostov I. P., Lukin Y. I., Kosolapova L. G.
Заглавие : Temperature and texture dependent spectroscopic dielectric model for frozen mineral soils at 0.1-15GHz
Коллективы : Progress in Electromagnetics Research Symposium , Russian Science Foundation [14-17-00656]
Место публикации : Progr. Electromag. Res. Symp. (PIERS): Proceedings: IEEE, 2016. - P.4754-4754. - , DOI 10.1109/PIERS.2016.7735742
Примечания : Cited References:2. - The work was supported by the Russian Science Foundation (grant No. 14-17-00656).
Ключевые слова (''Своб.индексиров.''): soil--dielectrics--temperature measurement--minerals--temperature dependence--dielectric measurement--frequency measurement
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Gorchakovsky A. A., Galeev R. G.
Заглавие : Inspection probes of a ferromagnetic resonance scanning spectrometer
Место публикации : Instrum. Exp. Tech. - 2021. - Vol. 64, Is. 2. - P.277-284. - ISSN 00204412 (ISSN), DOI 10.1134/S0020441221010218
Примечания : Cited References: 24. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation as part of a complex project on the development of high-technology production facilities (agreement no. 075-11-2019-054, November 22, 2019)
Аннотация: The design of inspection probes for a scanning ferromagnetic resonance spectrometer, which are designed for recording the absorption spectra of electromagnetic energy by local areas of thin magnetic films, is described. The degree of locality is determined by the diameter of the measuring hole of the probe in the range of 0.1–1.0 mm. The sensitivity of the device is significantly increased due to the miniaturization of the heterogeneous measuring resonator and its comparatively high Q factor. A set of replaceable probes makes it possible to cover the frequency range of 0.1–6.0 GHz, the signal-to-noise ratio for a probe with a hole diameter of 0.8 mm, which was measured on a permalloy film with a thickness of 5 nm, is at least 20 dB.
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