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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V., Karavaiskii A. Yu.
Заглавие : Generalized refractive mixing dielectric model of moist soils considering ionic relaxation of soil water
Место публикации : Rus. Phys. J. - 2013. - Vol. 56, Is. 3. - P.319-324. - DOI 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Горяйнов, Сергей Владимирович, Крылов, Александр Сергеевич, Втюрин, Александр Николаевич
Заглавие : Поведение цеолита натролита и фторапатита при высоких давлениях водной среды
Место публикации : Изв. РАН. Сер. физич. - 2013. - Т. 77, № 3. - С. 347-350. - DOI 10.7868/S0367676513030125
Аннотация: Впервые наблюдали гистерезисы (~0.3–0.4 ГПа) двух переходов натролита при 0.9 и 1.45 ГПа, значительные изменения спектров КР и появление очень интенсивной низкочастотной моды при 75 см^–1 в сверхгидратированной фазе высокого давления, изученной до 6.2 ГПа водной среды, причем зависимости частот полос этой фазы оказались нелинейными, что следует связать с изменениями позиций Н2О в каналах. Фторапатит, помещенный в водную среду в аппарат с алмазными наковальнями вместе с натролитом, согласно данным КР, не имеет переходов до 6.2 ГПа и демонстрирует линейные по давлению зависимости частот полос.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Vtyurin A. N.
Заглавие : Behavior of natrolite zeolite and fluorapatite at high pressures in a water medium
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2013. - Vol. 77, Is. 3. - P.313-316. - DOI 10.3103/S106287381303012X
Аннотация: The hysteresises (~0.3–0.4 GPa) of two transitions in natrolite at 0.9 and 1.45 GPa, considerable changes in the Raman spectra, and the appearance of very intense low–frequency mode at 75 cm–1 in the overhydrated phase of high pressure of water medium up to 6.2 GPa are observed for the first time. The depen dences of the band frequencies of this phase are nonlinear, due clearly to changes in the positions of H2 O in the channels. According to Raman data, fluorapatite placed together with natrolite in a water medium in a diamond anvil cell exhibits no transitions up to 6.2 GPa and displays linear pressure dependences of the band frequencies.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Миронов, Валерий Леонидович, Бобров, Павел Петрович, Фомин, Сергей Викторович, Каравайский, Андрей Юрьевич
Заглавие : Обобщенная рефракционная диэлектрическая модель влажных почв, учитывающая ионную релаксацию почвенной воды
Место публикации : 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Epov M. I., Mironov V. L., Muzalevskiy K. V., Eltsov I. N., Salomatov U. P.
Заглавие : A geosteering tool for horizontal well logging
Место публикации : Rus. Geol. Geophys. - 2013. - Vol. 54, Is. 9. - P.1103-1107. - ISSN 1068-7971, DOI 10.1016/j.rgg.2013.07.022
Ключевые слова (''Своб.индексиров.''): downhole radar--geosteering--oil-water contact--saturated formation--ultrabroadband nanosecond electromagnetic pulse
Аннотация: A theoretical study has been performed to check the possibility of using ultrabroadband nanosecond electromagnetic pulses as a geosteering tool for horizontal drilling to estimate the distance to the oil-water contact (OWC) in a floating oil accumulation. The voltage of a microwave-bandwidth pulse at the dipole receiver of a downhole radar was modeled for the case of a horizontal borehole near OWC in a formation saturated with oil and water. Numerical solutions to the boundary problem formulated on the basis of the Maxwell equations were obtained with the Microwave Studio software (www.cst.com). The frequency-dependent dielectric constants of the layered saturated formation and the drilling fluid were assumed according to experimentally tested models. The modeling has demonstrated that nanosecond electromagnetic pulses arriving from a layered oil-water contact can in principle be acquired and the distance from the wellbore to the OWC median can be inferred from the respective time delays recorded by a downhole radar. Additionally, the possible dynamic range and accuracy of sensing have been estimated. В© 2013.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Muzalevskiy K. V., Savin I. V.
Заглавие : Retrieving temperature gradient in frozen active layer of arctic tundra soils from radiothermal observations in L-Band-Theoretical modeling
Коллективы : Siberian Branch of the Russian Academy of Sciences (SB RAS)
Место публикации : IEEE J. Sel. Top. Appl. Earth Observ. Remote Sens.: IEEE-Institute Electrical and Electronics Engineers, 2013. - Vol. 6, Is. 3. - Ст.6520003. - P.1781-1785. - ISSN 1939-1404, DOI 10.1109/JSTARS.2013.2262108
Примечания : Cited References: 20
Предметные рубрики: WATER
RADIOMETER
BOREAL
Ключевые слова (''Своб.индексиров.''): active layer--arctic tundra soil--freezing--microwave remote sensing--radiometry--soil moisture and ocean salinity (smos)--soil temperature--temperature profile--thawing
Аннотация: Possibility of remote sensing of both the surface temperature and the temperature gradient in the permafrost active layer from L-band brightness temperature observations is theoretically investigated at a SMOS frequency of 1.4 GHz. Bare soil emission is simulated based on the semi-empirical L-MEB model. The brightness temperature is simulated using the soil density, surface roughness, temperature, and moisture profiles measured in situ at the Biosphere Station Franklin Bluffs, Alaska, USA (69°39'N, 148°43'W) from September 2, 1999, to August 23, 2001. The soil permittivity is calculated using the temperature-dependent generalized refractive mixing dielectric model for the organic rich soil sample collected in North Slope, Alaska (68°38'N, 149°35'W). This model predicts the complex dielectric constant of moist soil both thawed and frozen at temperatures from-30°C to +25°C and moistures from 0 to 0.94 g/g. The brightness temperatures simulated for field-of-view angles from 0 to 60\circ are inverted into the temperature profiles, and their deviations from the temperature profiles measured in situ are estimated. The error in reconstructing temperature profiles is found to be no greater than 1.8 °C to depths of 0.15 m. © 2013 IEEE.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Multirelaxation generalized refractive mixing dielectric model of moist soils
Место публикации : IEEE Geosc. Remote Sens. Letters. - 2013. - Vol. 10, Is. 3. - Ст.6332477. - P.603-606. - ISSN 1545-598X, DOI 10.1109/LGRS.2012.2215574
Ключевые слова (''Своб.индексиров.''): bound soil water--dielectric model--dielectric relaxations--dielectric spectra--free soil water--moist soil--bound waters--complex dielectric constant--debye relaxation--dielectric models--dielectric spectra--dipole relaxation--frequency ranges--gigahertz frequencies--gigahertz range--moist soil--soil water--spectroscopic parameters--water molecule--dielectric relaxation--mixing--molecules--soil moisture--geologic models
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Dielectric model of moist soils with varying clay content in the 0.04 to 26.5 GHz frequency range
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat.: Proc. - 2013. - Ст.6693613. - ISSN 978-1-4799-1060-1, DOI 10.1109/SIBCON.2013.6693613. - ISSN 978-14799-1062-5
Примечания : This work was supported by the Program of the Siberian Branch of the Russian Academy of Sciences, 2013-2016. Project II.12.1.1. - Загл. с этикетки диска
Ключевые слова (''Своб.индексиров.''): moist soil--dielectric model--dielectric spectra--dielectric relaxations--bound soil water--free soil water
Аннотация: In this paper, a soil texture dependent multirelaxation generalized refractive mixing dielectric model (MR GRMDM) for moist soils was developed. The model provides for complex permittivity of moist soils in both the gigahertz and megahertz frequency ranges, namely, from 40 MHz to 26.5 GHz.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Epov M. I., Savin I. V., Mironov V. L.
Заглавие : A temperature-dependent dielectric model for water- and oil-containing rocks in the frequency range from 0.5 to 15 GHz
Место публикации : Russ. Geol. Geophys.: Elsevier Science BV, 2012. - Vol. 53, Is. 7. - P.698-703. - ISSN 1068-7971, DOI 10.1016/j.rgg.2012.05.008
Примечания : Cited References: 17
Предметные рубрики: MOIST SOILS
POLARIZATION PROCESSES
PERMITTIVITY METHOD
Ключевые слова (''Своб.индексиров.''): dielectric permittivity--effective conductivity--water-containing rocks--temperature-dependent dielectric model
Аннотация: Dielectric spectra of water-containing rocks forming a mineral framework of the oil-saturated bed (clay minerals amount to˂16%) were measured in the frequency range from 500 MHz to 15 GHz and in the temperature range from 20 to 80 °C. A physical model for computing spectra of the dielectric permittivity and effective conductivity of the studied rocks has been elaborated. Its input parameters are water (salt solution) content and temperature. The errors of the computed spectra relative to the measured ones are estimated.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Миронов, Валерий Леонидович
Заглавие : Применимость концепции вымерзания незамерзшей воды в мерзлой почве для расчета зависимости диэлектрической проницаемости от влажности и температуры
Коллективы : "Решетневские чтения", международная научная конференция (16; 2012 ; нояб. ; 7-9; Красноярск)
Место публикации : Решетневские чтения: матер. XVI Междунар. науч. конф. : в 2 ч. - Красноярск, 2012. - Ч. 1. - С. 210-212. - ISBN 1990-7702
Аннотация: На основе измерений спектров комплексной диэлектрической проницаемости влажной почвы показано, что применение концепции вымерзания незамерзшей воды в мерзлой почве дает погрешности до 100 % при расчетах показателя преломления. Доказано, что такая существенная ошибка возникает за счет присутствия в почве различных типов незамерзшей воды.
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Суховский, Андрей Андреевич, Лукин, Юрий Иванович, Волков, Никита Валентинович, Миронов, Валерий Леонидович
Заглавие : Использование метода ядерного магнитного резонанса в измерении соотношения масс различных типов воды в почвах
Коллективы : "Решетневские чтения", международная научная конференция (16; 2012 ; нояб. ; 7-9; Красноярск)
Место публикации : Решетневские чтения: матер. XVI Междунар. науч. конф. : в 2 ч. - Красноярск, 2012. - Ч. 1. - С. 221-222. - ISBN 1990-7702
Аннотация: Предложен независимый метод определения максимального содержания связанной и переходной воды в почвах с помощью ядерного магнитного резонанса.Independent measuring method of maximum content bound and transition water in soils with NMR has been proposed.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mironov V. L., Savin I. V., Lukin Y. I., Karavaiskii A. Yu.
Заглавие : Phase transition analysis in freezing moist soils carried out on the basis of phase transitions characteristic to the different types of soil water
Коллективы : IEEE International Geoscience and Remote Sensing Symposium (2012 ; July ; 22-27; Munich, Germany)
Место публикации : IEEE International Geoscience and Remote Sensing Symposium (IGRASS): Proceedings. - Munich, 2012. - P.4497-4500. - ISBN 978-1-4673-1159-5, DOI 10.1109/IGARSS.2012.6350472
Аннотация: The analysis of the mass exchange between the nonfreezing bound and nonfreezing transient water types, as well as that between the nonfreezing transient water and ice in frozen soils has been done. The comparison between results obtained with radiometric and calorimetric methods made it possible to to explain apparent heat capacity behavior during a freezing event using the observed phenomena of phase transition in bound, transient, and capillary soil water types.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Anghel L., Balasoiu M., Ishchenko L. A., Stolyar S. V., Kurkin T. S., Rogachev A. V., Kuklin A. I., Kovalev Yu.S., Raikher Yu.L., Iskhakov R. S., Duca G.
Заглавие : Characterization of bio-synthesized nanoparticles produced by Klebsiella oxytoca
Коллективы : International Workshop on SANS-YuMO User Meeting at the Start-up of Scientific Experiments on the IBR-2M Reactor: Devoted to the 75th Anniversary of Yu M Ostanevich's Birth
Место публикации : Journal of Physics: Conference Series. - 2012. - Vol. 351, Is. 1. - Ст.012005. - P. - ISSN 1742-6588, DOI 10.1088/1742-6596/351/1/012005
Ключевые слова (''Своб.индексиров.''): absorption peaks--biominerals--chemical compositions--exopolysaccharides--ferrihydrites--fitting procedure--ftir spectroscopy--klebsiella oxytoca--model calculations--morphological analysis--radius of gyration--scattering objects--small angle x-ray scattering--structural and morphological properties--structural investigation--uv-vis spectroscopy--water dispersion--water-dispersed--experiments--nanoparticles--polysaccharides--raman spectroscopy--scattering--ultraviolet visible spectroscopy--synthesis (chemical)
Аннотация: Structural and morphological properties of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca are investigated. The stability of water dispersions of biomineral particles produced by Klebsiella oxytoca was monitored by UV-Vis spectroscopy. Their chemical composition was determined by FT-IR spectroscopy. The vibrational spectra of biogenic ferrihydrite nanoparticles revealed typical absorption peaks of exopolysaccharides. Morphological analysis based on Raman spectroscopy indicated the presence of exopolysaccharides on the surface as well as inside the pores of the ferrihydrite nanoparticles. Structural investigations of ultrasonic assisted samples of different concentration of water dispersed particles were performed using small angle X-ray scattering analysis. Model calculations and fitting procedures revealed scattering objects of an elongated shape with 6.73В±0.16 nm radius of gyration. В© Published under licence by IOP Publishing Ltd.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Likhacheva A.Yu., Vtyurin A. N.
Заглавие : Raman investigation of fibrous zeolites of the natrolite group at high pressures of an aqueous medium
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P.804-807. - ISSN 1062-8738, DOI 10.3103/S1062873812070143
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): aqueous medium--high pressure--intermediate phase--intermediate phasis--raman bands--raman investigations--water molecule--xrd--raman spectroscopy--silicon--zeolites
Аннотация: The intermediate phases preceding overhydration are observed by Raman spectroscopy both in scolecite Ca[Al2Si3O10] вЂў 3H2O and in thomsonite NaCa2[Al5Si 5O20] вЂў 6H2O upon compression in an aque-ous medium. The first intermediate phase of scolecite is attributed to a phase precursor revealed earlier using XRD at pressure of ~1 GPa. The widening of the Raman bands of O-H vibrations caused by the disordering of H 2O, which appears after additional water molecules are embedded in the zeolite channels, is typical of this intermediate phase. It is assumed on the basis of the Raman spectroscopy data that scolecite contains sec-ond overhydrated and second intermediate phases. В© 2012 Allerton Press, Inc.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Likhacheva A. Y., Goryainov S. V., Krylov A. S., Bul'bak T. A., Prasad PSR
Заглавие : Raman spectroscopy of natural cordierite at high water pressure up to 5?GPa
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2012. - Vol. 43, Is. 4. - P.559-563. - ISSN 0377-0486, DOI 10.1002/jrs.3060
Примечания : Cited References: 38. - We greatly appreciate the critical comments of Prof. R. Kaindl and an anonymous reviewer on this work, and we thank Dr G. Lepezin for providing the cordierite sample. This work was supported by RFBR grant 11-05-01121-a.
Предметные рубрики: SINGLE-CRYSTAL STRUCTURE
X-RAY
CHANNEL H2O
BEHAVIOR
SPECTRA
CO2
POLYMORPHISM
DIFFRACTION
CHEMISTRY
CAVITIES
Ключевые слова (''Своб.индексиров.''): cordierite--raman spectroscopy--high pressure--phase transition
Аннотация: The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5 GPa. However, the distortion of the ring tetrahedra observed previously at 2.3 GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7 GPa in a diamond anvil cell. At P 4 GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O–H stretching modes at about 4.5 GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P 3 GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high-pressure phase is likely a consequence of distortion of the channel-forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N., Molokeev M. S.
Заглавие : Bridging behaviour of the 2-thiobarbiturate anion in its complexes with LiI and NaI
Место публикации : Acta Crystallographica Section C Crystal Structure Communications. - 2013. - Vol. 69, Pt. 7. - P.704-708. - ISSN 0108-2701, DOI 10.1107/S0108270113014078
Ключевые слова (''Своб.индексиров.''): 2-thiobarbituric acid--coordinated water--dihydrates--edge sharing--hydrogen bonding interactions--three-dimensional networks--atoms--complex networks--hydrogen bonds--ligands--negative ions--positive ions--three dimensional--lithium
Аннотация: The structures of the LiI and NaI salts of 2-thiobarbituric acid (2-sulfanylidene-1-3-diazinane-4,6-dione, H 2TBA) have been studied. μ-Aqua-octaaquabis(μ-2- thiobarbiturato-κ2 O:O′)bis(2-thiobarbiturato-κO) tetralithium(I) dihydrate, [Li4(C4H3N 2O2S)4(H2O)9]·2H 2O, (I), crystallizes with four symmetry-independent four-coordinated LiI cations and four independent HTBA- anions. The structure contains two structurally non-equivalent LiI cations and two non-equivalent HTBA- anions (bridging and terminal). Eight of the coordinated water ligands are terminal and the ninth acts as a bridge between LiI cations. Discrete [Li4(HTBA)4(H2O)9] ·2H2O complexes form two-dimensional layers. Neighbouring layers are connected via hydrogen-bonding interactions, resulting in a three-dimensional network. Poly[μ2-aqua-tetraaqua(μ4-2- thiobarbiturato-κ4 O:O:S:S)(μ2-thiobarbiturato- κ2 O:S)disodium(I)], [Na2(C4H 3N2O2S)2(H2O) 5] n , (II), crystallizes with six-coordinated NaI cations. The octahedra are pairwise connected through edge-sharing by a water O atom and an O atom from the μ4-HTBA- ligand, and these pairs are further top-shared by the S atoms to form continuous chains along the a direction. Two independent HTBA- ligands integrate the chains to give a three-dimensional network. © 2013 International Union of Crystallography.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vinogradova I. S., Falaleev O. V.
Заглавие : Formation of the vascular system of developing bean (Phaseolus limensis L.) seeds according to nuclear magnetic resonance microtomography
Место публикации : Russ. J. Dev. Biol.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 43, Is. 1. - P.25-34. - ISSN 1062-3604, DOI 10.1134/S1062360412010079
Примечания : Cited References: 57. - The work was supported by the targeted program "Development of the Research Potential of Higher School" (project no. 2.1.1/2584).
Предметные рубрики: NMR MICROSCOPY
WATER-UPTAKE
COWPEA FRUIT
PLANTS
PHLOEM
TRANSPORT
FLOW
ARCHITECTURE
GRAINS
IMAGE
Ключевые слова (''Своб.индексиров.''): h-1 magnetic resonance microtomography--lima bean (phaseolus limensis) seeds--seed development and ripening--vascular bundles--transport of assimilates
Аннотация: H-1 magnetic resonance microtomography imaging was applied to study vascular systems in developing bean (Phaseolus limensis L.) seeds. Using the gradient echo method, we recorded 2D tomographic sections in the sagittal and axial planes of the fruits sampled from a vegetating plant on days 10, 17, 24, and 31 after fertilization. Any vascular connection between the tissues of maternal plant (bean pod and seed coat) and the embryo were undetectable. The embryo has an autonomous branched network of procambial strands in the cotyledons, converging to the embryonic axis. The bean pods are covered with a network of vascular bundles; large vascular strands run along the dorsal and ventral sutures. The seed coat vascular bundles are formed in the process of seed ripening and are represented by a developed vascular system multiply branching in the middle part of the ground parenchyma at the stage of physiological maturity. They are connected with the source of assimilates via the lateral pod veins and a large vascular bundle, entering the seed below the hilum via the placenta. Assimilates enter the external part of the seed coat, which contains no vascular bundles, via the funiculus vascular bundles and hilum tissue.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Миронов, Валерий Леонидович, Каравайский, Андрей Юрьевич, Лукин, Юрий Иванович
Заглавие : Применимость концепции незамерзшей воды при моделировании диэлектрической проницаемости мерзлых почв
Место публикации : Вестник СибГАУ. - 2013. - № 5. - С. 97-100
Аннотация: На основе измерений спектров комплексной диэлектрической проницаемости (КДП) влажной почвы показано, что применение модели Добсона-Жанга. в мерзлой почве дает погрешности до 100 %. Показано, что такая существенная ошибка возникает за счет присутствия в почве различных типов незамерзшей воды.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolobanschikova G. N., Rogozin D. Y., Firsova A. D., Rodionova, E. V., Degermendzhy N. N., Shabanov A. V.
Заглавие : Analysis of diatom algae from the water column and bottom sediments of Shira Lake (Khakassia, Russia)
Место публикации : Contemp. Probl. Ecol.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 8, Is. 2. - P.173-185. - ISSN 1995, DOI 10.1134/S1995425515020031. - ISSN 19954263(eISSN)
Примечания : Cited References: 23. - This work was supported by Russian Foundation for Basic Research, project no. 13-05-00429-a and the Biodiversity Program for Basic Research, Russian Academy of Sciences, project no. 30.8.
Ключевые слова (''Своб.индексиров.''): paleolimnology--diatom algae--meromictic lake--sedimentation--cyclotella choctawhatcheeana--aulacoseira valida--aulacoseira ambigua
Аннотация: Lake Shira as a meromictic lake is object of interest for paleolimnological studies. In May 2011 core samples were collected from the bottom of Lake Shira and the species composition of diatom algae, which serve as bioindicators of the state of the lake, were studied. In addition, in 2012, seasonal water samples and material from sediment traps were collected and the species composition of diatoms in them was analyzed. The results of the analysis showed that the lake, like in previous years of research, was dominated by Cyclotella choctawhatcheeana Prasad. Diatoms were found twice in the studied core above the white carbonate layers and were absent in other layers. The species living in the lake at present were observed down to the first white carbonate layer, including the predominant Cyclotella choctawhatcheeana. This fact presumably proves the consistency of the species composition of diatoms and the overall stable condition of the lake since 1946 (Rogozin et al., 2005). Down to the second white carbonate layer, the dominant species were Aulcosira valida (Grunow) Krammer and Aulcosira italica (Grunow) Simonsen. Nitzchia sigmodea (Nitzsch) W. Smith and Fragilaria construens var. venter (Ehrenberg) Grunow were also observed at these depths, dating approximately to 1655-1690. These are freshwater species that belong to the diatoms of arctic, alpine, and temperate latitudes, which develop in shallow waters under moderate temperature conditions. This fact suggests that Lake Shira was less salty in the middle and end of the 17th century than today.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bobrov P. P., Mironov V. L., Repin A. V.
Заглавие : Dielectric permittivity spectra of oil-water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks
Коллективы : RFBR [12-05-00502a, 14-05-00151a]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 2015. - Vol. 56, Is. 7. - P.1065-1073. - ISSN 1068-7971, DOI 10.1016/j.rgg.2015.06.007
Примечания : Cited References: 21. - This work was supported by RFBR (grant nos. 12-05-00502a and 14-05-00151a).
Предметные рубрики: MOIST SOILS
FREQUENCY
MODEL
TEMPERATURE
SALINITY
RANGE
GHZ
Ключевые слова (''Своб.индексиров.''): conductivity--dielectric permittivity--multifrequency dielectric relaxation--oil-bearing deposits--sandy-clayey rocks
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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