Труды сотрудников института физики

/ V. L. Mironov [et al.] // Rus. Phys. J. - 2013. - Vol. 56, Is. 3. - P. 319-324DOI 10.1007/s11182-013-0034-4 . -
Аннотация: A generalized multi-relaxation refractive mixing dielectric model of moist soils is suggested for frequencies in the range from 0.2 to 14.8 GHz. The model is based on dielectric measurements in this frequency range at a temperature of 20A degrees D for relative moisture content (by weight) changing from 2 to 43%. The model expands the range of applicability of the single-relaxation model suggested previously to the megahertz frequency range with allowance for the Maxwell-Wagner ionic relaxation which is clearly manifested in this frequency range for bound soil water. It is demonstrated that the error in calculating the complex dielectric permittivity spectra of the moist soil has the same order of magnitude as the error of experimental data used for model construction.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk, Russia
Omsk State Pedag Univ, Omsk, Russia
Academician MF Reshetnev Siberian State Aerosp Un, Krasnoyarsk, Russia

Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Bobrov, P. P.; Fomin, S. V.; Фомин, Сергей Викторович; Karavaiskii, A. Yu.; Каравайский, Андрей Юрьевич

/ A. A. Bykov [et al.] // Tech. Phys. Lett. - 2012. - Vol. 38, Is. 12. - P. 1080-1082, DOI 10.1134/S1063785012120036. - Cited References: 8 . - ISSN 1063-7850РУБ Physics, Applied

Аннотация: The magnetoresistance (MR) of substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 has been measured in a pulsed magnetic field with amplitude H = 250 kOe at various temperatures. It is established that temperature dependence of the MR relaxation parameter tau(T) is correlated with temperature dependence of the electric resistance R(T). A mechanism of relaxation is proposed that is related to the relaxation of conducting and dielectric phases in the volume of a sample under the conditions of phase separation. It is shown that the behavior of tau is related to the number of phase boundaries in the volume.

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Держатели документа:
[Bykov, A. A.
Popkov, S. I.
Shaykhutdinov, K. A.
Sablina, K. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Bykov, A. A.; Быков, Алексей Анатольевич; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Sablina, K. A.; Саблина, Клара Александровна

/ В. Л. Миронов [и др.] // Изв. вузов. Физика. - 2013. - Т. 56, № 3. - С. 75-79
Аннотация: Предложена многорелаксационная обобщенная рефракционная диэлектрическая модель влажных почв в диапазоне частот от 0, 2 до 14, 8 ГГц. Модель основана на данных диэлектрических измерений, проведенных в этом частотном диапазоне, при температуре 20 °С, для относительных весовых влажностей, изменяющихся в пределах от 2 до 43 %. Созданная модель расширяет частотный диапазон применимости ранее предложенной однорелаксационной модели в область мегагерцового диапазона за счет учета ионной релаксации Максвелла -Вагнера, которая существенно проявляется в связанной почвенной воде в этом диапазоне частот. Показано, что ошибка расчета с помощью предложенной модели спектров комплексной диэлектрической проницаемости влажной почвы имеет тот же порядок, что и погрешность экспериментальных данных, используемых при построении модели.

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

Доп.точки доступа:
Миронов, Валерий Леонидович; Mironov V. L.; Бобров, Павел Петрович; Фомин, Сергей Викторович; Fomin S.V.; Каравайский, Андрей Юрьевич; Karavaisky, A. Yu.

/ Б. А. Беляев, А. Н. Масленников, Н. А. Дрокин // Изв. вузов. Физика. - 2013. - Т. 56, № 8/2. - С. 291-293. - Работа выполнена при частичной поддержке гранта РФФИ № 12-02-12008, ФЦП «Научные и научно-педагогическиекадры инновационной России 2009−2013» и интеграционного проекта СО РАН № 109.
   Перевод заглавия: Electric relaxation and dielectric losses in liquid crystals in uhf region
Аннотация: Проведена аппроксимация спектров диэлектрической проницаемости жидкого кристалла 7СВ с использованием метода трансформации спектра диэлектрических потерь в электрический импедансный спектр, позволяющий сопоставить потери с эквивалентной электрической схемой жидкокристаллической ячейки.
Carried approximation permittivity spectra of liquid crystal 7CB using the transformation of the dielectric losses in the electrical impedance spectrum. It is allow to compare the losses with equivalent electrical circuit the liquid crystal cell.

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

Доп.точки доступа:
Масленников, Алексей Николаевич; Maslennikov, A.N.; Дрокин, Николай Александрович; Drokin, N.A.; Belyaev B. A.

[Текст] / S. I. Popkov [и др.] // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P275 . - ISBN 978-5-7444-3124-2


Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Sablina, K. A.; Саблина, Клара Александровна; Bykov, A. A.; Быков, Алексей Анатольевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)

[Текст] / S. E. Nikitin [и др.] // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P284 . - ISBN 978-5-7444-3124-2


Доп.точки доступа:
Nikitin, S. E.; Никитин, С.Е.; Krasikov, A. A.; Красиков, Александр Александрович; Bykov, A. A.; Быков, Алексей Анатольевич; Terent'yev, K. Yu.; Терентьев, Константин Юрьевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)

/ V. L. Mironov, P. P. Bobrov, S. V. Fomin // IEEE Geosc. Remote Sens. Letters. - 2013. - Vol. 10, Is. 3. - Ст. 6332477. - P. 603-606, DOI 10.1109/LGRS.2012.2215574 . - ISSN 1545-598X
   Перевод заглавия: Многорелаксационная обобщенная рефракционная диэлектрическая модель влажных почв
Аннотация: In this letter, a multirelaxation generalized refractive mixing dielectric model (GRMDM) for moist soil is proposed and substantiated in the frequency range from 0.04 to 26.5 GHz. This model is based on the methodology of a single-relaxation GRMDM which accounts only for the dipole relaxation of water molecules in the gigahertz frequency range. The proposed multirelaxation GRMDM takes into account both the dipole (Debye) and ionic (Maxwell-Wagner) relaxations of soil water molecules. For this purpose, it uses a two-frequency Debye relaxation equation for the dielectric spectra of bound water. The spectroscopic parameters of the multirelaxation GRMDM were derived by fitting the spectra calculated by this model to the respective measured ones. The main advantage of this model is that it predicts the complex dielectric constant of moist soils throughout the megahertz and gigahertz frequency ranges with the same error as the single-relaxation GRMDM does only in the gigahertz range.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Omsk State Pedag Univ, Omsk 644099, Russia

Доп.точки доступа:
Bobrov, P. P.; Fomin, S. V.; Фомин, Сергей Викторович; Миронов, Валерий Леонидович

/ A. S. Fedorov [et al.] // JETP Letters. - 2012. - Vol. 95, Is. 3. - P. 143-147, DOI 10.1134/S0021364012030058. - Cited References: 28. - We are grateful to the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences; the Interdepartmental Supercomputer Center, Russian Academy of Sciences; and the Computer Center, Siberian Federal University, for the use of their computer clusters for performing all calculations. This work was supported by the Ministry of Education and Science of the Russian Federation (federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013). . - ISSN 0021-3640РУБ Physics, Multidisciplinary

Аннотация: The effect of the lattice deformation on potential barriers for the motion of a lithium atom in crystalline silicon has been studied through ab initio density functional calculations. A new universal method of calculating the diffusion coefficient of an admixture in amorphous solid media through the activation mechanism has been proposed on the basis of these data. The method is based on the calculation of the statistical distribution of potential barriers for the motion of an admixture atom between minima depending on the position of neighboring atoms. First, the amorphous structure, which is generated by annealing from the crystalline structure with vacancies, has been simulated. Then, the statistical distribution of the potential barriers in the amorphous structure for various local environments of the admixture atoms has been calculated by means of linear regression with the parameters determined for barriers in crystalline silicon subjected to different deformations. The diffusion coefficient of the admixture has been calculated from this distribution by using the Arrhenius formula. This method has been tested by the example of crystalline and amorphous silicon with admixture of lithium atoms. The method demonstrates that the diffusion of lithium in amorphous silicon is much faster than that in crystalline silicon; this relation is confirmed experimentally.

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Держатели документа:
[Fedorov, A. S.
Popov, Z. I.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Popov, Z. I.; Попов, Захар Иванович; Kuzubov, A. A.; Кузубов, Александр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич

/ V. L. Mironov, P. P. Bobrov, S. V. Fomin // IEEE International Geoscience and Remote Sensing Symposium (IGRASS) : Proceedings. - Munich, 2012. - P. 5177-5179, DOI 10.1109/IGARSS.2012.6350887 . - ISBN 978-1-4673-1159-5
Аннотация: In this paper, a multi-relaxation generalized refractive mixing dielectric model (GRMDM) for moist soil is proposed and substantiated in the frequency range from 0.03 to 26.5 GHz. This model is based on the GRMDM of [1] developed in the range of GHz frequencies, considering only the dipole relaxation of water in the soil. The error of this model was shown to noticeably increase with the transition to the MHz range. Because in this range, one more relaxation, that is, ionic (Maxwell-Wagner) relaxation largely affects on the complex dielectric constant. The multi-frequency relaxation GRMDM developed in this paper compensates for this disadvantage of the single-relaxation GRMDM. In this model, the two-frequency relaxation Debye equation for the dielectric spectra of bound water has been used, thus expanding the scope of the GRMDM to the MHz range. The main advantage of this model is that it predicts complex dielectric constant of moist soils simultaneously in the GHz and MHz ranges.

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Доп.точки доступа:
Bobrov, P. P.; Fomin, S. V.; Фомин, Сергей Викторович; Миронов, Валерий Леонидович; IEEE International Geoscience and Remote Sensing Symposium (2012 ; July ; 22-27 ; Munich, Germany)

/ I. V. Savin, V. L. Mironov // Russ. Phys. J. - 2014. - Vol. 57, Is. 7. - P. 907-914, DOI 10.1007/s11182-014-0323-6. - Cited References: 13 . - ISSN 1064-8887. - ISSN 1573-9228РУБ Physics, Multidisciplinary

Аннотация: Frequency spectra of the dielectric permittivity of the Arctic soil of Alaska are investigated with allowance for the dipole and ionic relaxation of molecules of the soil moisture at frequencies from 40 MHz to 16 GHz and temperatures from –5 to +25°С. A generalized temperature-dependent multi-relaxation refraction dielectric model of the humid Arctic soil is suggested.

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Держатели документа:
Russian Acad Sci, Siberian Branch, L I Kirensky Inst Phys, Krasnoyarsk, Russia
Siberian State Aerosp Univ, Krasnoyarsk, Russia
Natl Res Tomsk State Univ, Tomsk, Russia

Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Савин, Игорь Викторович

/ L. I. Kveglis, A. V. Kuzovnikov, I. V. Timofeev ; ed.: BM Darinskii, , BM Darinsk // Mechanical spectroscopy III: Mechanical spectroscopy and relaxation phenomena IN SOLIDS. Ser. Solid state phenomena : Trans tech publications LTD, 2006. - Vol. 115. - P. 267-273. - Cited References: 19 . - ISBN 1012-0394. - ISBN 3-908451-24-8РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter + Spectroscopy

Аннотация: The self-organization of an atomic structure in Tb30Fe70 and Co50Pd50 films possessing of high values of the perpendicular magnetic anisotropy (PMA) constant (K perpendicular to similar to 10(6) erg/cm(3)) is investigated by transmission electron microscopy. The crystallization of the films is realized in an explosive way with formation of different dissipative structures from the initial nanocrystalline state. In present work the structural model of a thin film in mezzo-scale and the correlation of a structure with magnetic properties are discussed.

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Доп.точки доступа:
Kuzovnikov, A. V.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Darinskii, B. M. \ed.\; International Conference on Mechanical Spectroscopy and Relaxation Phenomena in Solids (3 ; 2006 ; Cracow, Poland)

/ E. M. Alakshin [et al.] // Low Temp. Phys. - 2015. - Vol. 41, Is. 1. - P. 39-42, DOI 10.1063/1.4906335. - Cited References:12. - This study was funded by a grant issued within the framework of statesupport for the Kazan (Volga) Federal University, in order to improveits competitiveness among the world's leading research and educationcenters (RFBR Grant No. 14-02-31361 mol_a), with partial funding fromthe RF Ministry of Education and Sciences (Project No. 02.G25.31.0029). . - ISSN 1063. - ISSN 1090-6517. - РУБ Physics, Applied

Аннотация: This is an experimental study of the spin kinetics of 3He in contact with diamagnetic samples of inverse opals SiO2, and LaF3 nanopowder. It is demonstrated that the nuclear magnetic relaxation of the absorbed 3He occurs due to the modulation of dipole-dipole interaction by the quantum motion in the two-dimensional film. It is found that the relaxation of liquid 3He occurs through a spin diffusion to the absorption layer, and that the restricted geometry of diamagnetic nanoporous media has an influence on the 3He relaxation.

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Держатели документа:
Kazan Fed Univ, Kazan 420008, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Nauka KSC SB RAS, Special Design & Technol Bur, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Alakshin, E. M.; Gazizulin, R. R.; Zakharov, M. Yu.; Klochkov, A. V.; Morozov, E. V.; Морозов, Евгений Владимирович; Salikhov, T. M.; Safin, T. R.; Safiullin, K. R.; Tagirov, M. S.; Shabanova, O. B.; RFBR [14-02-31361 mol_a]; RF Ministry of Education and Sciences[02.G25.31.0029]

/ P. P. Bobrov, V. L. Mironov, A. V. Repin // Russ. Geol. Geophys. - 2015. - Vol. 56, Is. 7. - P. 1065-1073, DOI 10.1016/j.rgg.2015.06.007. - Cited References: 21. - This work was supported by RFBR (grant nos. 12-05-00502a and 14-05-00151a). . - ISSN 1068-7971РУБ Geosciences, Multidisciplinary

Аннотация: Experimental measurements of the dielectric permittivity and equivalent conductivity of sandy-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65 °C. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10%, the dielectric permittivity in the frequency range from 1 MHz to 1 GHz depends little on the mineral composition of the sample and on the concentration of the saturating solution. When the portion of water is 33.3% or higher, increasing the concentration of the salt solution leads to an increase in the equivalent conductivity and the real part of the complex dielectric permittivity. Using the refractive model of the complex dielectric permittivity, we have estimated the dielectric properties of bound water, which depend on temperature and the type of clay (bentonite or kaolin) in the sand-clay mixture but are independent of the water saturation and the amount of clay in the sample.

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Держатели документа:
Omsk State Pedagogical University, Naberezhnaya im. Tukhachevskogo 14, Omsk, Russian Federation
L.V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
M.F. Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Repin, A. V.; RFBR [12-05-00502a, 14-05-00151a]

/ V. L. Mironov, I. P. Molostov, V. V. Scherbinin // Int. Sib. Conf. on Control and Communicat. (SIBCON 2015) : Proceedings : IEEE-Institute Electrical and Electronics Engineers, 2015. - P. 1-7, DOI 10.1109/SIBCON.2015.7147146 . -
Аннотация: The dielectric model for an arctic soil both thawed and frozen has been developed. The model is based on the soil dielectric measurements carried out in the ranges of gravimetric moisture from 0.01 to 0.43 g/g, dry soil density from 1.25 to 1.83 g/cm3, and temperature from 25 to -30°C (cooling run), in the frequency range 0.05-15 GHz. To fit the results of measurements of the soil complex dielectric constant as a function of soil moisture and wave frequency, the refractive mixing dielectric model in conjunction with the Debye multi-relaxation equations were applied. As a result, the spectroscopic parameters of dielectric relaxations for the bound, transient bound, and unbound soil water components were derived, being further complimented with the thermodynamics parameters to ensure a complete set of parameters of the temperature dependent multi-relaxation spectroscopic dielectric model for moist soils proposed. To calculate complex dielectric constant of soil, the following input variables have to be assigned: 1) density of dry soil, 2) gravimetric moisture, 3) wave frequency, and 4) temperature. The error of the dielectric model was evaluated in terms of RMSE, yielding the values RMSE of 0.53 and 0.43 for the soil dielectric constant and loss factor, respectively. These values appeared to be in the order of the dielectric measurement error itself. The dielectric model suggested can be applied in the active and passive remote sensing techniques in microwave to develop algorithms for retrieving soil moisture and freeze/thaw state of the topsoil in the Arctic regions. © 2015 IEEE.

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Доп.точки доступа:
Molostov, I. P.; Scherbinin, V. V.; Щербинин, Всеволод Владиславович; Миронов, Валерий Леонидович; International Siberian Conference on Control and Communications(11 ; 2015 ; May 21-23 ; Omsk)

/ F. Cheng [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 41. - P. 18078-18089, DOI 10.1039/c5dt02760h. - Cited References: 42. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51272242, 51572023, 51511130035), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (RERU2015022), and the excellent tutor section of the Fundamental Research Funds for the Central Universities of China University of Geosciences, Beijing (2-9-2015-028). This work was also partly supported by the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). . - ISSN 1477-9226
   Перевод заглавия: Влияние модуляции состава на люминесцентные свойства твердотельного люминофора Li1-xAgxLu(MoO4)2 допированного Eu3+РУБ Chemistry, Inorganic & Nuclear

Аннотация: Double molybdate scheelite-type solid-solution phosphors Li1−xAgxLu1−y(MoO4)2:yEu3+ were synthesized by the solid state reaction method, and their crystal structures and luminescence properties were investigated in detail. The composition modulation and structural evolution of this series of samples were studied and the selected AgEu(MoO4)2, AgLu(MoO4)2, LiLu(MoO4)2 and LiEu(MoO4)2 phases were analyzed based on the Rietveld refinement. Depending on the variation of the Li/Ag ratio in Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors, the difference in the luminescence properties of Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors was ascribed to two factors, one reason could be assigned to the coupling effect and the nonradiative transition between the energy levels of LixAg1−xLu(MoO4)2 matrices and the activator Eu3+, another could be due to the near ultraviolet energy absorption and transmission efficiency between the charge-transfer (CT) band of O2−–Mo6+ and the 4f → 4f emissive transitions of Eu3+. The ultraviolet-visible diffuse reflection spectra (UV-vis DRS) and Raman spectra analysis were also used to verify the above mechanism.

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Держатели документа:
School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China

Доп.точки доступа:
Cheng, F.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jing, X.

/ V. L. Mironov [et al.] // Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International. - 2015. - P. 2031-2034DOI 10.1109/IGARSS.2015.7326198
   Перевод заглавия: Температурно-зависимая много-релаксационная спектроскопическая диэлектрическая модель для талой и мерзлой органической почвы в диапазоне частот 0,05-15 ГГц.
Аннотация: The dielectric model for an arctic organic-rich soil collected on the Yamal peninsula (50% of organic matter) both thawed and frozen has been developed. The model is based on the soil dielectric measurements carried out in the ranges of gravimetric moisture 0.03 to 0.55 g/g, dry soil density 0.72 to 0.87 g/cm3, and temperature 25 to −30°C (cooling run), in the frequency range 0.05–15 GHz. To fit the results of measurements of the soil complex dielectric constant as a function of soil moisture and wave frequency, the refractive mixing dielectric model in conjunction with the Debye multi-relaxation equations were applied. As a result, the spectroscopic parameters of dielectric relaxations and electrical specific conductivities for the bound, transient bound, and unbound soil water components were derived, being further complimented with the thermodynamics parameters. Having these parameters, the complex dielectric constant of soil can be predicted as a function of 1) density of dry soil, 2) gravimetric moisture, 3) wave frequency, and 4) temperature1.

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Доп.точки доступа:
Savin, I. V.; Савин, Игорь Викторович; Muzalevskiy, K. V.; Музалевский, Константин Викторович; Миронов, Валерий Леонидович; Geoscience and Remote Sensing Symposium(2015 ; jul ; 26-31 ; Milan, Italy)

/ И. В. Савин, В. Л. Миронов // Изв. вузов. Физика. - 2015. - Т. 58, № 8/3. - С. 19-21. - Библиогр.: 4. - Работа выполнена при поддержке грантом РФФИ № 13-05-00502 . - ISSN 0021-3411
   Перевод заглавия: A temperature-dependent multi-relaxation spectroscopic dielectric model for thawed and frozen Alaska Arctic soil at 0.05-16 GHz
Аннотация: Разработана диэлектрическая модель талой и мерзлой арктической органической почвы Аляски (90% органики). Модель основана на диэлектрических измерениях образцов почвы с весовой влажностью от 0,01 до 0,94 г/г, плотностью сухого сложения от 0,56 до 0,67 г/см3 в диапазоне температур от 25 до -30°C (в про-цессе охлаждения) и в диапазоне частот от 0,05 до 16 ГГц. Предложенная диэлектрическая модель может быть применена в активных и пассивных СВЧ-методах дистанционного зондирования для разработки алгоритмов определения влажности и температуры почвы для богатого органикой верхнего слоя почвы в арктических регионах.
A dielectric model for thawed and frozen Arctic organic-rich soil (90% organic matter) has been developed. The model is based on soil dielectric measurements that were collected over ranges of gravimetric moisture from 0,01 to 0,94 g/g, dry soil density from 0,56 to 0,67 g/cm3, and temperature from 25 to -30°C (cooling run) in the frequency range of 0,05-16 GHz. The proposed dielectric model can be applied in active and passive microwave remote sensing techniques to develop algo-rithms for retrieving the soil moisture and the freeze/thaw state of organic-rich topsoil in the Arctic regions.

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

Доп.точки доступа:
Миронов, Валерий Леонидович; Mironov, V. L.; Savin, I. V.

/ V. L. Mironov, I. V. Savin // Phys. Chem. Earth. - 2015. - Vol. 83–84: Emerging science and applications with microwave remote sensing data. - P. 57-64, DOI 10.1016/j.pce.2015.02.011. - Cited References: 14. - The study was supported by the Russian Science Foundation (project 14-17-00656). . - ISSN 1474-7065
   Перевод заглавия: Температурно зависимая многорелаксационная спектроскопическая диэлектрическая модель талой и мерзлой органической почвы в диапазоне частот 0.05 – 15 ГГцРУБ Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences + Water Resources

Аннотация: A dielectric model for thawed and frozen Arctic organic-rich soil (50% organic matter) has been developed. The model is based on soil dielectric measurements that were collected over ranges of gravimetric moisture from 0.03 to 0.55 g/g, dry soil density from 0.72 to 0.87 g/cm3, and temperature from 25 to −30 °C (cooling run) in the frequency range of 0.05–15 GHz. The refractive mixing dielectric model was applied with the Debye multi-relaxation equations to fit the measurements of the soil’s complex dielectric constant as a function of soil moisture and wave frequency. The spectroscopic parameters of the dielectric relaxations for the bound, transient bound, and unbound soil water components were derived and were complimented by the thermodynamic parameters to obtain a complete set of parameters for the proposed temperature-dependent multi-relaxation spectroscopic dielectric model for moist soils. To calculate the complex dielectric constant of the soil, the following input variables must be assigned: (1) density of dry soil, (2) gravimetric moisture, (3) wave frequency, and (4) temperature. The error of the dielectric model was evaluated and yielded RMSEε′ values of 0.348 and 0.188 for the soil dielectric constant and the loss factor, respectively. These values are on the order of the dielectric measurement error itself. The proposed dielectric model can be applied in active and passive microwave remote sensing techniques to develop algorithms for retrieving the soil moisture and the freeze/thaw state of organic-rich topsoil in the Arctic regions.

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Доп.точки доступа:
Savin, I. V.; Савин, Игорь Викторович; Миронов, Валерий Леонидович

/ E. V. Morozov, O. N. Martyanov // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 2. - P. 223-235, DOI 10.1007/s00723-015-0741-9. - Cited References:46. - This research was performed with the financial support of Russian Science Foundation (project no. 15-19-00119). . - ISSN 0937-9347. - ISSN 1613-7507РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy

Аннотация: An nuclear magnetic resonance (NMR) imaging approach for studying flocculant-induced asphaltene precipitation processes is introduced in this report. Unlike commonly accepted techniques, which primarily measure aggregation processes on the submicron scale (the level of asphaltene molecules and their aggregates), NMR imaging demonstrates the capability to obtain new useful information about bulk system behavior on the macro scale. To reveal the capabilities of the method, the model toluene-asphaltene system and two samples of natural crude oils with different chemical composition and physical properties (such as asphaltene content and density) were employed for experiments. The process of colloidal suspension formation and two different patterns of its evolution were observed depending on both the asphaltene content and the flocculant concentration. In the first pattern, the flocculant-induced precipitation leads to the slow uniform compacting of the suspension and descent of the sedimentation front, whereas the second pattern is characterized by sediment accumulation and the upwards drift of the front. It was found that the behavior of the precipitated asphaltenes in the model system correlates well with those observed in natural crude oils. The results achieved in this work are in agreement with the data obtained previously via other techniques. Thus, NMR imaging proved to be an efficient method for probing flocculant-induced precipitation in crude oils.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Pr Ak Lavrentieva 5, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia.

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович; Russian Science Foundation [15-19-00119]

/ M. . Pudlak [et al.] // Phys. Rev. E. - 2011. - Vol. 84, Is. 5. - Ст. 51912, DOI 10.1103/PhysRevE.84.051912. - Cited References: 34. - This work is partly supported by the Slovak Academy of Sciences in the framework of Center of Excellence NANOFLUID, VEGA Grants No. 2/0069/10, No. FIS2008-00781/FIS (Spain), and RFBR No. 11-02-00086 (Russia). . - ISSN 1539-3755РУБ Physics, Fluids & Plasmas + Physics, Mathematical

Аннотация: Creation of electrons or excitons by external fields in a system with initially statistically independent unrelaxed vibrational modes leads to an initial condition term. The contribution of this term in the time convolution generalized master-equation approach is studied in the second order of the perturbation theory in path-integral formalism. The developed approach, applied for the analysis of dynamics in the photosynthetic reaction center, exhibits the key role of the initial condition terms at the primary stage of electron transfer.

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Держатели документа:
[Pudlak, M.
Pincak, R.] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia
[Pichugin, K. N.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Nazmitdinov, R. G.] Univ Illes Balears, Dept Fis, ES-07122 Palma De Mallorca, Spain
[Nazmitdinov, R. G.] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
ИФ СО РАН
Institute of Experimental Physics, Slovak Academy of Sciences, 04353 Kosice, Slovakia
Kirensky Institute of Physics, Akademgorodok 50/38, 660036 Krasnoyarsk, Russian Federation
Departament de Fisica, Universitat de les Illes Balears, ES-07122 Palma de Mallorca, Spain
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation

Доп.точки доступа:
Pudlak, M.; Pichugin, K. N.; Пичугин, Константин Николаевич; Nazmitdinov, R. G.; Pincak, R.