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Найдено документов в текущей БД: 17

    Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002-2009
[Text] / D.Y. Rogozin [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 485-496, DOI 10.1007/s10452-010-9328-6. - Cited References: 27. - We thank Mr. Fyodor Kozlov for assistance in winter lake surveys, Dr. Alexander Tolomeev and Dr. Egor Zadereev (Institute of Biophysics SD RAS) for field data of August 2006, Dr. Galina Kalacheva (Institute of Biophysics SD RAS) for ash content determination and all others who helped us in expeditions. We are also very grateful to Dr. Wolf Mooij (Netherlands Institute of Ecology) and two anonymous reviewers for valuable comments and advice on article preparation. This work was partly supported by the Netherlands Organization for Scientific Research, Grant 047.011.2004.030, the Russian Foundation for Basic Research, Grants No. 09-04-01114-a and 09-05-00915-a, by Siberian Branch of Russian Academy of Sciences, Integrative Project No. 95 and joint Taiwan-Siberian Project No. 149, by Russian Academy of Sciences, Program No. 23.15, by award No. PG07-002-1 of the Ministry of Education and Sciences of Russian Federation and U.S. Civilian Research & Development Foundation for the Independent States of the Former Soviet Union (CRDF). . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
PHOTOTROPHIC SULFUR BACTERIA
   MONO LAKE

   CHEMOCLINE

Кл.слова (ненормированные):
Meromixis -- Mixolimnion -- Oxic-anoxic interface -- Thermocline -- Weather conditions -- 1-D model

Аннотация: In a brackish, temperate, 24-m-deep Lake Shira, the profiles of salinity, temperature, oxygen and sulfide concentrations were measured on a seasonal basis from 2002 to 2009. The lake was shown to be meromictic with autumnal overturn restricted to mixolimnion. The depth of mixolimnion and position of oxic-anoxic interface varied annually. The spring mixing processes contribute to the formation of mixolimnion in autumn. The exceptionally windy spring of 2007 caused the deepening of mixolimnion in the winter of 2008. The winter position of oxic-anoxic interface was affected by the position of lower boundary of mixolimnion in all winters. The salinity in the winter mixolimnion increased compared with the autumn because of freezing out of salts from the upper water layers meters during ice formation and their dissolution in water below. The profiles of salinity and temperature were simulated by the mathematical 1-D model of temperature and salinity conditions taking into account ice formation. The simulated profiles generally coincided with the measured ones. The coincidence implies that simplified one-dimensional model can be applied to roughly describe salinity and density profiles and mixing behavior of Lake Shira.


Доп.точки доступа:
Rogozin, D.Y.; Genova, S.N.; Генова, Светлана Николаевна; Gulati, R.D.; Degermendzhy, A.G.

    Numerical modeling of vertical stratification of Lake Shira in summer
[Text] / P.V. Belolipetsky [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 561-570, DOI 10.1007/s10452-010-9330-z. - Cited References: 35. - The study was financially supported by the Netherlands Organization for Scientific Research (NWO), Grant 047.011.2004.030, RFBR, Grant 05-05-89002; RFBR, Grant 07-01-00153; Multidisciplinary integration project of SB RAS No. 95. . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology

Аннотация: A one-dimensional numerical model and a two-dimensional numerical model of the hydrodynamic and thermal structure of Lake Shira during summer have been developed, with several original physical and numerical features. These models are well suited to simulate the formation and dynamics of vertical stratification and provide a basis for an ecological water-quality model of the lake. They allow for the quantification of the vertical mixing processes that govern not only the thermal structure but also the nutrient exchange, and more generally, the exchange of dissolved and particulate matter between different parts of the lake. The outcome of the calculations has been compared with the field data on vertical temperature and salinity distributions in Lake Shira. Lake Shira is meromictic and exhibits very stable annual stratification. The stratification is so stable because of the high salinity of the water. If the water in Lake Shira were fresh and other parameters (depth, volume, and meteorology) were the same, as now, the lake would be mixed in autumn. Using the newly developed models and using common meteorological parameters, we conclude that Lake Shira will remain stratified in autumn as long as the average salinity is higher than 3%.


Доп.точки доступа:
Belolipetsky, P.V.; Белолипецкий, Павел Викторович; Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Genova, S.N.; Генова, Светлана Николаевна; Mooij, W.M.

    Effects of vibrations on dynamics of miscible liquids
[Text] / Y. Gaponenko, V. Shevtsova // Acta Astronaut. - 2010. - Vol. 66, Is. 01.02.2013. - pp. 174-182, DOI 10.1016/j.actaastro.2009.05.019. - Cited References: 10 . - ISSN 0094-5765
РУБ Engineering, Aerospace
Рубрики:
GRAVITY
Кл.слова (ненормированные):
Mixing -- Vibration -- Interface -- Miscible fluid

Аннотация: We report on a numerical study of the mixing of two miscible fluids in gravitationally stable configuration. In the absence of external forces the diffusion process leads to the mixing of species. The aim of this study is to analyze the physical mechanism by which vibrations affect the mixing characteristic of two stratified miscible fluids. The translational periodic vibrations of a rigid cell filled with different mixtures of water-isopropanol are imposed. The vibrations with a constant frequency and amplitude are directed along the interface. In absence of gravity vibration-induced mass transport is incomparably faster than in diffusion regime. Our results highlight the strong interplay between gravity and vibrational impact, the relative weight of each effect is determined by ratio vibrational and classical Rayleigh numbers. (C) 2009 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Shevtsova, V.

    The effect of viscous friction between the solar wind and plasma sheet on electric field generation in the magnetosphere
[Text] / V. V. Denisenko, S. S. Zamai, A. V. Kitaev // Geomagn. Aeron. - 2003. - Vol. 43, Is. 6. - P680-686. - Cited References: 15 . - ISSN 0016-7932
РУБ Geochemistry & Geophysics
Рубрики:
MODEL
   LAYER

Аннотация: The effect of viscous friction at the boundary between the plasma sheet and the solar wind on electric field generation in the plasma sheet is estimated. The boundary layer is modeled by a viscous layer with two mixing plasma flows. The distribution of the flow velocity in the inner parts of the plasma sheet outside the boundary layer is specified on the basis of experimental data. The calculated distribution of the electric potential in the plasma sheet and at the magnetopause is projected along magnetic lines onto the ionosphere. It has been indicated that, within the scope of the adopted model, viscous friction on the magnetotail flanks for an effective Reynolds number of Re = 3 x 10(3) results in an increase in the potential across the polar cap from 11 to 18 kV. In this case the maximum and minimum of the electric potential at the polar cap boundary are shifted from the nightside to the dayside. It is emphasized that the total distribution of the electric potential in the polar cap under quiet conditions results from the operation of several mechanisms of electric field generation.


Доп.точки доступа:
Zamai, S.S.; Kitaev, A.V.; Денисенко, Валерий Васильевич

    Mixing Under Vibrations in Reduced Gravity
[Text] : статья / Y. A. Gaponenko, V. Shevtsova // Microgravity Science and Technology. - 2008. - Vol. 20, Iss. 3-4 . - p. 307-311, DOI 10.1007/s12217-008-9075-7 . - ISSN 0938-0108

Аннотация: The aim of this study is to analyze the physical mechanism by which vibrations affect the mixing characteristic of two initially stratified miscible fluids. The translational periodic vibrations of a rigid cell filled with different mixtures (Sc = 7125) are considered. The vibrations with a constant frequency are imposed parallel to the initially planar interface. The ability of the applied vibrations to enhance the flow is examined. At the early stage after imposing the vibrations the Kelvin-Helmholtz instability is observed in absence and at low level of gravity. Later in time the system undergoes a transition to Rayleigh-Taylor instability. With increasing of gravity level the life-time of Kelvin-Helmholtz instability is decreased. We found the critical value of Gr above which this instability do not developed.

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Доп.точки доступа:
Shevtsova, V.; Гапоненко, Юрий Анатольевич

    Modeling of CO2 fluxes between atmosphere and boreal forest
/ Y. V. Barkhatov [et al.] ; ed.: Z Yang, Z Yang // 18TH BIENNIAL ISEM CONFERENCE ON ECOLOGICAL MODELLING FOR GLOBAL CHANGE AND COUPLED HUMAN AND NATURAL SYSTEM. Ser. Procedia Environmental Sciences : ELSEVIER SCIENCE BV, 2012. - Vol. 13: 18th Biennial ISEM Conference on Ecological Modelling for Global Change and Coupled Human and Natural Systems (SEP 20-23, 2011, Beijing, PEOPLES R CHINA). - P. 621-625, DOI 10.1016/j.proenv.2012.01.053. - Cited References: 17 . - ISBN 1878-0296
РУБ Ecology + Environmental Sciences

Аннотация: Difficulties in estimating terrestrial ecosystem CO2 fluxes on regional scales have significantly limited our understanding of the global carbon cycle. We present a method of using tall-tower-based CO2 concentrations for estimating CO2 fluxes over a forested region. With long-term measurements of the CO2 mixing ratio at a 300-m-tall tower, regional CO2 fluxes were estimated for several months, from the first obtained data. Estimates of a monthly-integrated surface CO2 flux over the region were obtained by the analysis of average gradients and estimates of the rate of vertical mixing between the atmospheric boundary layer (ABL) and the free troposphere. For the comparison of the ABL budget method and field measurements a zero-dimensional mathematical model of the ecosystem of Siberian boreal forests was used. The model is a system of ordinary differential equations with additional conditions superimposed on the parameters. The main occurring processes are described - photosynthesis, respiration, seasonal changes of active phytomass, water balance of trees, the influence of light, humidity, and temperature on photosynthesis and respiration. (C) 2011 Published by Elsevier B. V. Selection and/or peer-review under responsibility of School of Environment, Beijing Normal University.

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Доп.точки доступа:
Barkhatov, Y.V.; Belolipetsky, P.V.; Белолипецкий, Павел Викторович; Degermendzhi, A.G.; Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Verkhovets, S.V.; Timokhina, A.V.; Panov, A.V.; Shchemel, A.L.; Vedrova, E.F.; Trephilova, O.V.; Yang, Z \ed.\

    Mixing of liquids by vibrations - Preparation of the vipil experiment on the iss
[статья] : доклад, тезисы доклада / V. Shevtsova, Y. Gaponenko, A. Mialdun // Proceedings of the International Astronautical Congress, IAC. - 2012. - P. 791-796


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Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Mialdun, A.; 63rd International Astronautical Congress 2012, IAC 2012 (2012 ; 01.10 - 05.10 ; Naples)

    Change in the circulation regime in the stratified saline Lake Shira (Siberia, Republic of Khakassia)
/ V. M. Belolipetskii [et al.] // Dokl. Earth Sci. - 2017. - Vol. 474, Is. 2. - P649-652, DOI 10.1134/S1028334X17060010 . - ISSN 1028-334X
Аннотация: The in-situ data on the vertical structure and stability of the vertical stratification of saline Lake Shira over the past decade (2007–2015) are analyzed. Simplified mathematical models have shown that strong wind in the autumn of 2014 together with rather thick ice in the winter of 2015 caused a change in the circulation regime of this water reservoir from meromictic (incomplete mixing) to holomictic (compete mixing). Based on the results obtained, a circulation regime for deep saline lakes located in the continental climate zone, in particular, in the arid zones of Southern Siberia (Khakassia, Transbaikal, and Altai) can be predicted under various climate scenarios of the future. © 2017, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belolipetskii, V. M.; Degermendzhi, A. G.; Genova, S. N.; Rogozin, D. Y.
532.5
Ч-67

    Численное моделирование влияния силы ветра на процессы перемешивания в озере Шира в летний и осенний периоды
[Текст] : научное издание / Т. В. Якубайлик // Решетневские чтения. - 2016. - Т. 2, № 20. - С. 153-155 . - ISSN 1990-7702
   Перевод заглавия: Numerical simulation of wind power INFLUENCE ON lake SHIRA mixing processes in summer and autumn
УДК

Аннотация: Проанализировано влияние силы ветра на гидрофизические процессы, происходящие в соленом стратифицированном озере в летний и осенний период, по результатам численного моделирования.
The paper analyses numerical simulation results of the wind power influence on hydrophysical processes in salt stratified lake in summer and autumn.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Якубайлик, Т.В.; Yakubaylik T.V.

    Disturbance of meromixis in saline Lake Shira (Siberia, Russia): Possible reasons and ecosystem response
/ D. Y. Rogozin [et al.] // Limnologica. - 2017. - Vol. 66. - P12-23, DOI 10.1016/j.limno.2017.06.004 . - ISSN 0075-9511

Кл.слова (ненормированные):
Food chain -- Meromixis -- Mixing -- Mixolimnion -- Purple sulfur bacteria -- Stability -- Stratification -- Chromatiaceae -- Phytomastigophorea

Аннотация: Saline Lake Shira (Southern Siberia, Russia) was meromictic through the observation period 2002–2015. During the under-ice periods of 2015 and 2016, complete mixing of the water column was recorded for the first time, and hydrogen sulphide temporarily disappeared from the water column of the lake; i.e. in those years the lake turned to holomixis. In the summer of 2015, a sharp increase in chlorophyll a, organic carbon, zooplankton, and phytoflagellates was observed in the lake, which was probably due to the release of nutrients from the monimolimnion. Purple sulfur bacteria completely disappeared from the lake after the first mixing in 2015, and did not reappear despite the restoration of meromixis in 2017. Thus, it was demonstrated that purple sulfur bacteria are sensitive to the weakening of the stratification of Lake Shira. Based on the data of the seasonal monitoring of temperature and salinity profiles over the period 2002–2017, it was presumed that the main cause of deep mixing in 2015 was the weakening of the salinity gradient due to strong wind impact and early ice retreat in the spring of 2014. In addition, it was shown that in previous years a significant contribution to the maintenance of meromixis was made by an additional influx of fresh water, which caused a rise in the lake level in the period 2002–2007. Thus, we identified a relationship between the stratification regime of the lake and the change in its level, which provides valuable information both for the forecast of water quality and for reconstruction of the Holocene climate humidity in this region of Southern Siberia from the sediment cores of Lake Shira. © 2017 Elsevier GmbH

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Держатели документа:
Institute of Biophysics Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Computing Modeling Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Rogozin, D. Y.; Tarnovsky, M. O.; Belolipetskii, V. M.; Zykov, V. V.; Zadereev, E. S.; Tolomeev, A. P.; Drobotov, A. V.; Barkhatov, Y. V.; Gaevsky, N. A.; Gorbaneva, T. B.; Kolmakova, A. A.; Degermendzhi, A. G.

    Kinematic-wave model of viscous fingers with mixing layer
/ A. A. Chesnokov, V. Yu Liapidevskii, I. V. Stepanova // J. Phys. Conf. Ser. - 2017. - Vol. 894, Is. 1, DOI 10.1088/1742-6596/894/1/012107 . - ISSN 1742-6588
Аннотация: A new one-dimensional kinematic model of viscous fingers growth is proposed. This model is based on the assumption of an intermediate layer formation. The shear instability of the flow is developed in this layer due to intensive mixing of liquids of different viscosities. The thickness of the intermediate layer between outer ones is determined by the velocity difference in the layers. The results of the calculation of the growth rate of the fingers in the framework of this model are in a good agreement with the calculations carried out on the basis of more general two-dimensional equations as well as with the known Koval model.

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Держатели документа:
Novosibirsk State University, Novosibirsk, Russian Federation
Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russian Federation
Institute of Computational Modelling SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Chesnokov, A. A.; Yu Liapidevskii, V.; Stepanova, I. V.

    Three-dimensional numerical simulation of water mixing processes in lake Shira under wind stress in autumn
[Text] : доклад, тезисы доклада / T. V. Yakubaylik // 13th International Conference on Salt Lake Research (ICSLR 2017) : book of abstracts. - Улан-Удэ : Бурятский государственный университет, 2017. - P44 . - ISBN 978-5-9793-1075-6


РИНЦ,
Источник статьи

Держатели документа:
Institute of Computational Modelling of Siberian Branch of the Russian Academy of Sciences

Доп.точки доступа:
Yakubaylik, T.V.; 13th International Conference on Salt Lake Research (ICSLR 2017)(2017 ; 21.08 - 25.08 ; Ulan-Ude, Russia)
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    Investigation of the influence of wind stress in autumn leading to unstable stratification in a meromictic lake using three-dimensional numerical modeling
/ T. V. Iakubaylik // IOP Conference Series: Materials Science and Engineering : Institute of Physics Publishing, 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019, ) Conference code: 149243, Is. 6, DOI 10.1088/1757-899X/537/6/062072 . -
Аннотация: Currents in lakes affect the distribution of hydrophysical and hydrobiological characteristics. Three-dimensional model study is an important step toward an improved understanding and reliable prediction of the distribution of hydrophysical fields. Salt stratified lake Shira refers to meromictic reservoirs. The depth of the upper mixed layer depends on many factors (even a few isolated, fairly rare facts of its complete mixing are known). The study of the influence of each of them separately is the task of mathematical modeling. The model results indicate that strong wind stress in the autumn can result in unstable density stratification, leading to intense vertical circulation. © 2019 IOP Publishing Ltd. All rights reserved.

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Держатели документа:
Institute of Computational Modeling, SB RAS, Akademgorodok 50/44, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Iakubaylik, T. V.
Пат. 2475334 Российская Федерация, МПК 2475334.
    СПОСОБ ПОЛУЧЕНИЯ МОДИФИКАТОРА ДЛЯ ДОЭВТЕКТИЧЕСКИХ АЛЮМИНИЕВО-КРЕМНИЕВЫХ СПЛАВОВ
[Текст] / Генрих Гаврилович Крушенко, Михаил Николаевич Фильков ; патентообладатель Учреждение Российской академии наук Институт вычислительного моделирования Сибирского отделения Российской академии наук (ИВМ СО РАН) ; Опубл. 02.06.2011 ; МПК 2475334. - [Б. м. : б. и.], 2013
Перевод заглавия: METHOD OF MAKING CONDITIONING AGENT FOR HYPOEUTECTIC ALUMINIUM-SILICON ALLOYS
   Перевод заглавия: METHOD OF MAKING CONDITIONING AGENT FOR HYPOEUTECTIC ALUMINIUM-SILICON ALLOYS

Аннотация: <p num="33">Изобретение относится к литейному производству, в частности к модифицированию литейных алюминиево-кремниевых сплавов доэвтектического состава. Модификатор в виде прутка получают путем смешивания алюминиевого порошка с размерами частиц 0,5-0,7 мм и ультрадисперсного порошка нитрида титана TiN со средним размером частиц порядка 40 нанометров в планетарной мельнице в течение 5 минут при 400 об/мин и прессования полученной композиции в пруток. Способ позволяет получать пруток для модифицирования с повышенным содержанием ультрадисперсного порошка нитрида титана. 2 табл., 1 пр. </p>
<p num="34">FIELD: process engineering.</p> <p num="35">SUBSTANCE: invention relates to metallurgy, particularly, to conditioning castable aluminium-silicon alloys of hypoeutectic composition. Rod-like modifying agent is made by mixing aluminium powder with particle size of 0.5-0.7 mm and superdispersed powder of titanium nitride with mean particle size of 40 nm in planetary-type mill for fine minutes at 400 rpm, and compacting produced composition into rod.</p> <p num="36">EFFECT: higher content of superdispersed powder of titanium nitride.</p> <p num="37">2 tbl, 1 ex </p>

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Держатели документа:
Учреждение Российской академии наук Институт вычислительного моделирования Сибирского отделения Российской академии наук (ИВМ СО РАН)

Доп.точки доступа:
Крушенко, Генрих Гаврилович; Krushenko Genrikh Gavrilovich; Фильков, Михаил Николаевич; Fil'kov Mikhail Nikolaevich; Учреждение Российской академии наук Институт вычислительного моделирования Сибирского отделения Российской академии наук (ИВМ СО РАН)
Свободных экз. нет

    Modelling of ethanol pyrolysis in a commercial CVD reactor for growing carbon layers on alumina substrates
/ A. V. Minakov, M. M. Simunin, I. I. Ryzhkov // Int. J. Heat Mass Transf. - 2019. - Vol. 145. - Ст. 118764, DOI 10.1016/j.ijheatmasstransfer.2019.118764 . - ISSN 0017-9310

Кл.слова (ненормированные):
Chemical kinetics -- Chemical vapour deposition -- Computational modelling -- Ethanol pyrolysis

Аннотация: Chemical vapour deposition (CVD) is widely used for preparation of pyrolytic carbons from various precursors. The prediction of deposition kinetics requires deep understanding of all transport phenomena involved. In this work, we perform the computational modelling of ethanol pyrolysis in a commercial CVD reactor (a tube furnace). The reactor is employed for growing carbon layers on alumina substrates. The inlet gas flow is produced by evaporating azeotrope ethanol/water mixture and mixing it with inert gas (argon). The modelling is performed in 3D and 2D statements using Marinov mechanism with 57 species participating in 383 reactions. The heat and species transport is taken into account with temperature dependent physical properties. It is shown that the inlet gas velocity in the 2D statement should be corrected for a meaningful comparison with the 3D case. A good agreement is found between species mole fractions at the substrate position for 3D and 2D statements at low volume flow rates, while at high flow rates some deviations are observed. The temperature at the substrate position is found to be lower than at the reactor wall due to inflow of a colder gas. The main pyrolysis products at moderate temperatures (around 900 °C) are water, ethylene, hydrogen, carbon monoxide, and methane. With increasing temperature, the mole fractions of hydrogen, acetylene, and carbon monoxide increase, while those of water and methane become smaller. With increasing ethanol/water volume flow rate, the mole fractions of ethanol and pyrolysis products saturate at some constant values due to incomplete thermal decomposition of ethanol in the reactor volume. The rise of argon flow rate leads to the decrease of pyrolysis products mole fractions due to decrease of residence time. The obtained results can be employed for simulating and analyzing pyrolysis processes in realistic CVD reactors with complex geometry as well as for the development of coupled gas phase and surface reaction model of carbon layer deposition on nanoporous substrates. © 2019 Elsevier Ltd

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Держатели документа:
Siberian Federal University, Svobodny 79, Krasnoyarsk, 660041, Russian Federation
Institute of Computational Modelling SB RAS, Akademgorodok 50–44, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Minakov, A. V.; Simunin, M. M.; Ryzhkov, I. I.

    Production of a Composite Based on Alumina Nanofibers and Detonation Nanodiamonds for Creating Phenol Indication Systems
/ N. O. Ronzhin, E. D. Posokhina, E. V. Mikhlina [et al.] // Dokl. Chem. - 2019. - Vol. 489, Is. 1. - P267-271, DOI 10.1134/S001250081911003X . - ISSN 0012-5008

Аннотация: Abstract: A composite of alumina nanofibers (ANF) and modified detonation nanodiamonds (MDND) was produced by mixing aqueous suspensions of the components in a weight ratio of 5 : 1 with subsequent incubation of the mixture for 15 min at 32°C. It was assumed that the formation of the composite is ensured by the difference of the zeta potentials of the components, which is negative for MDND and positive for ANF. Vacuum filtration of the mixture through a fluoroplastic filter (pore diameter 0.6 ?m) formed disks 40 mm in diameter, which were then heat-treated at 300°C to impart structural stability to the composite. Scanning electron microscopy detected that the obtained composite has a network structure, in which MDND particles are distributed over the surface of ANF. It was determined that the MDND particles incorporated in the composite catalyze the phenol–4-aminoantipyrine–H2O2 oxidative azo coupling reaction to form a colored product (quinoneimine). The applicability of the composite to repeated phenol detection in aqueous samples was demonstrated. © 2019, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Biophysics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, AkademgorodokKrasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Computational Modeling, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, AkademgorodokKrasnoyarsk, 660036, Russian Federation
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, AkademgorodokKrasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ronzhin, N. O.; Posokhina, E. D.; Mikhlina, E. V.; Simunin, M. M.; Nemtsev, I. V.; Ryzhkov, I. I.; Bondar, V. S.

    Magnetic field effect on recombination of radicals diffusing on a two-dimensional plane
/ N. N. Lukzen, K. L. Ivanov, V. M. Sadovsky, R. Z. Sagdeev // J Chem Phys. - 2020. - Vol. 152, Is. 3. - Ст. 034103, DOI 10.1063/1.5131583 . - ISSN 0021-9606
Аннотация: Magnetic Field Effects (MFEs) on the recombination of radicals, which diffuse on an infinite plane, are studied theoretically. The case of spin-selective diffusion-controlled recombination of Radical Pairs (RPs) starting from a random spin state is considered assuming uniform initial distribution of the radicals. In this situation, reaction kinetics is described by a time-dependent rate coefficient K(t), which tends to zero at long times. Strong MFEs on K(t) are predicted that originate from the ?g and hyperfine driven singlet-triplet mixing in the RP. The effects of spin relaxation on the magnetic field are studied, as well as the influence of the dipole-dipole interaction between the electron spins of the RP. In the two-dimensional case, this interaction is not averaged out by diffusion and it strongly affects the MFE. The results of this work are of importance for interpreting MFEs on lipid peroxidation, a magnetosensitive process occurring on two-dimensional surfaces of cell membranes. © 2020 Author(s).

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Держатели документа:
International Tomography Center, Siberian Branch, Russian Academy of Sciences, Institutskaya Str. 3a, Novosibirsk, 630090, Russian Federation
Novosibirsk State University, Pirogova Str. 1, Novosibirsk, 630090, Russian Federation
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/44, Krasnoyarsk, 660036, Russian Federation
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science, Leninskii Prospect 31, Moscow, 19991, Russian Federation

Доп.точки доступа:
Lukzen, N. N.; Ivanov, K. L.; Sadovsky, V. M.; Sagdeev, R. Z.