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Biogeochemical conversion of sulfur species in saline lakes of Steppe Altai

Journal of Oceanology and Limnology 2018年第3期36卷 676-686页

作者： BORZENKO Svetlana V. KOLPAKOVA Marina N. shvartsev stepan L. ISUPOV Vitaly P. Institute of Natural Resources Ecology and CryologySiberian Branch of Russian Academy of SeiencesChita 672049Russia Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of SciencesNovosibirsk 630090Russia National Research Tomsk Polytechnic University Tomsk 634050Russia Tomsk Department of the Trofimuk Institute of Petroleum-Gas Geology and Geophysics Siberian Branch of the Russian Academy of SciencesTomsk 634050Russia Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of SciencesNovosibirsk 630090Russia

The aim of the present research is to identify the main mechanisms of sulfur behavior in saline lakes in the course of time and followed transformations in their chemical composition. The influence of water on chemical composition of biochemical processes involved in decomposition of organic matter was determined by the study of behavior of reduced forms of sulfur in lakes. The determination of reduced forms of sulfur was carried out by successive transfer of each form of sulfur to hydrogen sulfide followed by photometric measurements. The other chemical components were determined by standard methods(atomic absorption, potentiometric method, titration method and others). The salt lakes of the Altai steppe were studied in summer season 2013–2015. Analysis of the chemical composition of the saline lakes of Altai Krai has shown that carbonate-, hydrocarbonate-and chloride ions dominate among anions; sodium is main cation; sulfates are found in subordinate amounts. Reduced forms of sulfur occur everywhere: hydrogen and hydrosulfide sulfur S^(2-) prevail in the bottom sediments; its derivative—elemental S^0—prevails in the lakes water. The second important species in water of soda lakes is hydrosulfide sulfur S^(2-), and in chloride lakes is thiosulfate sulfur S_2O_2^(3ˉ). The lag in the accumulation of sulfates in soda lakes in comparison to chloride lakes can be explained by their bacterial reduction, followed by the formation and deposition of iron sulfides in sediments. In chloride lakes gypsum is a predominantly barrier for sulfates.

关键词： saline lake sulfate reduction gypsum Altai

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Thermodynamic Model of Uranium and Arsenic Accumulation in Saline Lakes

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 135-136页

作者： Olga GASKOVA Vitaly ISUPOV Alexander VLADIMIROV stepan shvartsev Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences Novosibirsk State University Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences Tomsk State University Tomsk Branch of the Trofimuk Institute of Oil and Gas Geology and Geophysics Siberian Branch of Russian Academy of Sciences

1 Introduction The attractiveness of Shaazgai-Nuur Soda Lake(pH9.2-9.4)as an alternative metal source is explained by the high concentration of dissolved uranium(~1 mg/l)due to the location of water drainage territory... 详细信息

关键词： saline lakes uranium arsenic sorption thermodynamic model calcite goethite.

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Chemical composition and sulfur forms in saline lakes of Kulunda Plain(Russia)

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 139-141页

作者： Marina KOLPAKOVA Svetlana BORZENKO stepan shvartsev Vitaliy ISUPOV Trofimuk Institute of Petroleum Geology and Geophysics Tomsk Affiliate Siberian Branch of the Russian Academy of Sciences National research Tomsk Polytechnic University Institute of natural resources ecology and cryology of SB RAS Institute of Solid State Chemistry and Mechanochemistry

1 Introduction On the territory Kulunda Plain,located to the south-west of the Ob’plateau,there are more than 3,000 fresh and salt lakes with water TDS range from 1 to 430 g/*** interest in these lakes was associated... 详细信息

关键词： Chemical composition and sulfur forms in saline lakes of Kulunda Plain Russia

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Factors and mechanisms of chemical composition formation of saline lakes in West Mongolia

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 142-144页

作者： Marina KOLPAKOVA stepan shvartsev Vitalyi ISUPOV Sodov ARIUNBILEG Alexander VLADIMIROV Olga GASKOVA National research Tomsk Polytechnic University Tomsk Department of the Trofimuk Institute of Petroleum-Gas Geology and Geophysics Siberian Branch of the Russian Academy of Sciences Academichesky ave Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences Novosibirsk 630128 Russia Institute of Geology and Mineral Resources Mongolian Academy of Sciences Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences Tomsk State University

All the lakes are accumulative systems for the various chemical ***,the ratios of the elements in different lake types are very *** is generally accepted that the composition of lake water determined by

关键词： saline lakes Mongolia system water-rock geochemistry evaporation

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Uranium in Saline Lakes of Mongolia and Adjacent Areas

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 137-138页

作者： Vitaly ISUPOV Ariunbileg SODOV Svetlana SHATSKAYA Marina KOLPAKOVA Ljudmila RAZVOROTNEVA Alexander VLADIMIROV stepan shvartsev Leonid KUIBIDA Sergey KRIVONOGOV Ekaterina MOROZ Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences Institute of Geology and Mineral Resources Mongolian Academy of Sciences Tomsk Branch of the Trofimuk Institute of Oil and Gas Geology and Geophysics Siberian Branch of Russian Academy of Sciences Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences Tomsk State University Institute of Chemical Kinetics and Combustion Siberian Branch of Russian Academy of Sciences

1 Introduction Increasing demand for uranium raw materials for the nuclear industry has stimulated interest in non-traditional sources,including hydromineral ones[Qin,2009].Those are saline lakes located in the uraniu... 详细信息

关键词： saline lakes uranium Mongolia Chuya basin Altai region sorption

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High performance Wannier interpolation of Berry curvature and related quantities with WannierBerri code

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npj Computational Materials 2021年第1期7卷 293-301页

作者： stepan S.Tsirkin Department of Physics University of ZurichWinterthurerstrasse 190Zurich CH-8057Switzerland

Wannier interpolation is a powerful tool for performing Brillouin zone integrals over dense grids of k points,which are essential to evaluate such quantities as the intrinsic anomalous Hall conductivity or Boltzmann transport ***,more complex physical problems and materials create harder numerical challenges,and computations with the existing codes become very expensive,which often prevents reaching the desired *** this article,I present a series of methods that boost the speed of Wannier interpolation by several orders of *** include a combination of fast and slow Fourier transforms,explicit use of symmetries,and recursive adaptive grid refinement among *** proposed methodology has been implemented in the python code WannierBerri,which also aims to serve as a convenient platform for the future development of interpolation schemes for other phenomena.

关键词： interpolation quantities Wannier

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Methodology for local correction of the heights of global geoid models to improve the accuracy of GNSS leveling

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Geodesy and Geodynamics 2024年第1期15卷 42-49页

作者： stepan Savchuk Alina Fedorchuk Institute of Navigation Military University of AviationDeblinPoland Department of Higher Geodesy and Astronomy Lviv Polytechnic National UniversityLvivUkraine

At present,one of the methods used to determine the height of points on the Earth’s surface is Global Navigation Satellite System(GNSS)*** is possible to determine the orthometric or normal height by this method only if there is a geoid or quasi-geoid height model *** paper proposes the methodology for local correction of the heights of high-order global geoid models such as EGM08,EIGEN-6C4,GECO,and XGM2019e_*** methodology was tested in different areas of the research field,covering various relief *** dependence of the change in corrected height accuracy on the input data was analyzed,and the correction was also conducted for model heights in three tidal systems:"tide free","mean tide",and"zero tide".The results show that the heights of EIGEN-6C4 model can be corrected with an accuracy of up to 1 cm for flat and foothill terrains with the dimensionality of 1°×1°,2°×2°,and 3°×3°.The EGM08 model presents an almost identical *** EIGEN-6C4 model is best suited for mountainous relief and provides an accuracy of 1.5 cm on the 1°×1°*** height correction accuracy of GECO and XGM2019e_2159 models is slightly poor,which has fuzziness in terms of numerical fluctuation.

关键词： GNSS leveling Global geoid model Gravity anomaly Weight data Correcting data

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HOMOCLINIC SOLUTIONS OF NONLINEAR LAPLACIAN DIFFERENCE EQUATIONS WITHOUT AMBROSETTI-RABINOWITZ CONDITION

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Acta Mathematica Scientia 2021年第3期41卷 712-718页

作者： Antonella NASTASI stepan TERSIAN Calogero VETRO University of Palermo Department of Mathematics and Computer ScienceVia Archirafi 3490123PalermoItaly Institute of Mathematics and Informatics Bulgarian Academy of Sciences1113 SofiaBulgaria

The aim of this paper is to establish the existence of at least two non-zero homoclinic solutions for a nonlinear Laplacian difference equation without using AmbrosettiRabinowitz type-conditions. The main tools are mo... 详细信息

关键词： Difference equations homoclinic solutions non-zero solutions (p,q)-Laplacian operator

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ON THE FOURIER-VILENKIN COEFFICIENTS

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Acta Mathematica Scientia 2017年第2期37卷 293-300页

作者： Martin G.GRIGORYAN stepan SARGSYAN Chair of Higher Mathematics Faculty of Physics Yerevan State University

In this article, we prove the following statement that is true for both unbounded and bounded Vilenkin systems： for any ε∈ （0, 1）, there exists a measurable set E C [0, 1） of measure bigger than 1 - s such that for any function f ∈ LI[0, 1）, it is possible to find a function g ∈ L^1 [0, 1） coinciding with f on E and the absolute values of non zero Fourier coefficients of g with respect to the Vilenkin system are monotonically decreasing.

关键词： Vilenkin system expansions Fourier coefficients

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Impact of drilling waste pollution on land cover in a high subarctic forest-tundra zone

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Pedosphere 2022年第3期32卷 414-425页

作者： Anatoly OPEKUNOV Marina OPEKUNOVA stepan KUKUSHKIN Sergey LISENKOV Institute of Earth Sciences St.Petersburg State UniversitySt.Petersburg 199178(Russia)

Global climate changes can lead to the destruction of the permafrost zone and contribute to the active transfer of pollutants to natural *** can be especially pronounced in the areas of oil and gas production in the *** study aimed to define the landscape components(i.e.,groundwater,soil water,soil,and indicator plant species)of chemical pollution with metals,oil hydrocarbons,and polycyclic aromatic hydrocarbons,from the discharge of drill *** at two sites in the forest-tundra zone of Western Siberia(Russia)were carried out within two years of *** migration was found in peaty-gley heavy loamy soils and iron-illuvial clayey podburs,but lateral migration of different pollutants did not exceed 200 ***,radial migration was practically absent owing to the high buffering capacity of the soil organic horizon and the upward flow of matter in the seasonal melt *** main indicators of drilling waste pollution were high concentrations of Sr,Ba,petroleum hydrocarbons,and Cl^(-)*** the waste disposal sites,the concentration of Ba and Sr in the soil water were 1150 and 1410μg L^(-1),respectively;in groundwater,they reached 721 and 2360μg L^(-1),*** the soil,Ba and Sr accumulated in the peaty horizon(798 and 706 mg kg^(-1),respectively).The concentration of Cl^(-)ions in the soil water at the site of waste discharge was 1912 mg L^(-1),and at a distance of 200 m,it decreased to 77.4 mg L^(-1).The Cl^(-)concentration in the groundwater was lower,and at a distance of 200 m,it was 38.9 mg L^(-1).The highest concentration of petroleum hydrocarbons in the surface layer was found in the peaty-gley soils(up to 2400 mg kg^(-1)).In glandular-illuvial podburs,it was 420 mg kg^(-1).In horizons BH and BC,it was close to the background values(27 and 33 mg kg^(-1),respectively).Alkalinization of soils and water under the influence of drill cuttings led to the death of oligotrophic and acidophilic vegetation at a distanc

关键词： metal petroleum hydrocarbons plant indicator species pollutant migration in soil polycyclic aromatic hydrocarbon

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