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Modelling of microbial enhanced oil recovery application using anaerobic gas-producing bacteria

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Petroleum Science 2014年第2期11卷 272-278页

作者： Pavel Spirov Yanina Ivanova svetlana Rudyk Department of Petroleum and Chemical Engineering Sultan Qaboos University Chemistry & Environment Mrsk Olie og Gas A/S Kanalen 2 DK-6700 Esbjerg

Microbial enhanced oil recovery （MEOR） methods apply injection of bacteria to depleted oil reservoirs to produce oil, which had remained unrecovered after the conventional methods of production. The ability ofthermophilic anaerobic bacteria to produce gas as the main mechanism in potential MEOR in high salinities of 70-100 g/L was investigated in this study. Maximum gas production of up to 350 mL per 700 mL of salty solution was produced at a salinity of 90 g/L stably during 2-4 days of experiment. The experimental results were upscaled to the Snorre Oilfield, Norway, and simulated using ECLIPSE software for 27 months. The best scenarios showed that the increase in oil recovery on average was at 21% and 17.8% respectively. This study demonstrated that anaerobic bacteria used in biogas plants could be an attractive candidate for MEOR implementation due to their ability to withstand high temperature and salinity, and produce gas in large volumes.

关键词： Microbiological enhanced oil recovery CO2 injection ECLIPSE simulation

Using thermal remote sensing in the classification of mountain permafrost landscapes

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Journal of Mountain Science 2021年第3期18卷 635-645页

作者： svetlana V.KALINICHEVA Alyona A.SHESTAKOVA Melnikov Permafrost Institute Siberian Branch of Russian Academy of SciencesYakutsk 677010Russia

Thermal infrared satellite imagery is increasingly utilized in permafrost *** useful application of the land surface temperature(LST)products is classification and mapping of landscapes in permafrost regions,as LST values can help differentiate between frozen and unfrozen *** article describes a new approach to the use of *** essence of the new approach lies in the fact that in the territory where it is impossible to determine(indicate)the state of the underlying ground according to the same morphological characteristics(relief,vegetation,soil composition,etc.),the LST parameter,which reflects the thermal state of the landscape,allows as an additional criterion(indicator)identify frozen/un-frozen *** this work,using the above approach,a map has been compiled,which shows the permafrost natural-territorial complexes of the Elkon Massif,Eastern Siberia,including topography,slope aspect,slope angle,vegetation,snow cover and *** map provides a more detailed and updated description of permafrost distribution in the study area.

关键词： Permafrost mapping Permafrost landscape classification Landsat Thermal infrared imagery Mountain permafrost Land surface temperature Eastern Siberia

Second-Order Accurate Structure-Preserving Scheme for Solute Transport on Polygonal Meshes

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Communications on Applied Mathematics and Computation 2024年第3期6卷 1600-1628页

作者： Naren Vohra Konstantin Lipnikov svetlana Tokareva Department of Mathematics Oregon State UniversityKidder Hall 368CorvallisOR 97331USA Los Alamos National Laboratory Theoretical DivisionMS B284Los AlamosNM 87545USA

We analyze mimetic properties of a conservative finite-volume (FV) scheme on polygonal meshes used for modeling solute transport on a surface with variable elevation. Polygonal meshes not only provide enormous mesh generation flexibility, but also tend to improve stability properties of numerical schemes and reduce bias towards any particular mesh direction. The mathematical model is given by a system of weakly coupled shallow water and linear transport equations. The equations are discretized using different explicit cell-centered FV schemes for flow and transport subsystems with different time steps. The discrete shallow water scheme is well balanced and preserves the positivity of the water depth. We provide a rigorous estimate of a stable time step for the shallow water and transport scheme and prove a bounds-preserving property of the solute concentration. The scheme is second-order accurate over fully wet regions and first-order accurate over partially wet or dry regions. Theoretical results are verified with numerical experiments on rectangular, triangular, and polygonal meshes.

关键词： Hyperbolic coupled system Shallow water equations Linear solute transport Finite-volume(FV)schemes Bounds-preservation

The Effect of Global Smoothness on the Accuracy of Treecodes

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Communications in Computational Physics 2022年第10期32卷 1332-1360页

作者： Henry A.Boateng svetlana Tlupova Department of Mathematics San Francisco State UniversitySan FranciscoCA 94132USA Department of Mathematics Farmingdale State CollegeSUNYFarmingdaleNY 11735USA

Treecode algorithms are widely used in evaluation of N-body pairwise interactions in O(N)or O(NlogN)*** they can provide high accuracy approximations,a criticism leveled at the methods is that they lack global *** this work,we study the effect of smoothness on the accuracy of treecodes by comparing three tricubic interpolation based treecodes with differing smoothness properties:a global C^(1) continuous tricubic,and two new tricubic interpolants,one that is globally C^(0) continuous and one that is *** present numerical results which show that higher smoothness leads to higher accuracy for properties dependent on the derivatives of the kernel,nevertheless the global C^(0) continuous and discontinuous treecodes are competitive with the C^(1) continuous *** advantage of the discontinuous treecode over the C^(1) continuous is that,in addition to function evaluations,the discontinuous treecode only requires evaluations of the first derivatives of the kernel while the C^(1) continuous treecode requires evaluations up to third order *** the first derivatives are computed using finite differences,the discontinuous version can be viewed as kernel independent and of utility for a wider array of kernels with minimal effort.

关键词： Fast summation treecode tricubic interpolation

Combustion Metamorphic Rocks as a Sign of Ancient Mud Volcanoes

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地学前缘 2009年第S1期16卷 198-199页

作者： svetlana Kokh Lab of Metamorphism and Metasomathose Institute of Geology and Mineralogy SB RAS

Zones of combustion metamorphism(CM)are frequently associated with oil fields and adjacent bituminous marine sediments.A typical example is the Mottled Zone(MZ)complexes located within carbonate strata at the western margin of the Arabian petroleum province(Israel,Jordan).Being localized upon the eroded surface of Upper Cretaceous stratum, the MZ complexes are composed of brecciated sediments of the underlying Cretaceous sequence uplifted from depths of at least 1.5 ***

关键词： combustion metamorphism paralava mud volcano hydrocarbon reservoir

Eastern Siberia permafrost transect(ESPT).A first stage:The Verkhoyansk Range part

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Journal of Mountain Science 2023年第6期20卷 1499-1507页

作者： Robert SYSOLYATIN svetlana KALINICHEVA Alexander FEDOROV Maria ROZHINA Melnikov Permafrost Institute Yakutsk 677010Russia

Environmental and geomorphological processes in the mountainous areas of Eastern Siberia is strongly conditioned by the thermal state of permafrost(permanently frozen ground).However,the scarce data about climate and weak of permafrost study have led to the unclarity of mountain permafrost condition in this *** increase in the mean annual air temperature over the past 50 years in the northeastern Siberia by various estimates is from 1.1℃to 3.3℃.So far,almost no information is available on the permafrost response to climatic changes in the *** Kolyma Route(around 2000 km length),connecting Yakutsk and Magadan that crosses 5 climatic types and more than 10 permafrost landscapes,so it seems a suitable path for establishing basic(reference)monitoring *** 12 target boreholes,on the first stage 5 boreholes up to 30 m in depth were drilled and instrumented for measuring temperature at sites adjacent to weather stations in the Verkhoyansk Range from 283 to 1288 m *** we present conception,purpose,and methods for permafrost study project with first preliminary results from the highest weather station of the East Siberia *** following research about geophysical investigations,permafrost landscape description,mapping and spatial modelling,numerical computing,physical modelling of permafrost thickness might be initiated by the Eastern Siberia Permafrost Transect(ESPT)-project.

关键词： Ground temperature Mountain permafrost Temperature e monitoring Verkhoyansk Range Climate change.

Derivative vegetation indices as a new approach in remote sensing of vegetation

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Frontiers of Earth Science 2012年第2期6卷 188-195页

作者： svetlana M.KOCHUBEY Taras A.KAZANTSEV Institute of Plant Physiology and Genetics National Academy of Sciences of UkraineKievVasylkivska 31/1703022Ukraine Estonqan University of Life Sciences TartuFr.R.Kreutzwaldi 5EE-51014Estonia

This paper focuses on the advantages of derivative vegetation indices over simple reflectance- based indices that are traditionally used for remote sensing of vegetation. The idea of using reflectance derivatives instead of simple reflectance spectra was proposed several decades ago. Despite this, it has not been widely used in monitoring systems because the derivatives lack reliable parameters. In addition, most satellite monitoring systems are not equipped with hyperspectral sensors, which are considered necessary for operating with the reflectance derivatives. Here, we present original data indicating that the chlorophyll-related derivative index D725/D702 we derived can be accurately estimated from a reflectance spectrum of 10 nm resolution that would be suitable for most satellite-based sensors. Furthermore, the index is not sensitive to soil reflectance and can therefore be used for testing of open crops. Presence of blanc reflectance is also unnecessary. Preliminary results of index testing are presented. Perspectives on using this and other derivative indices are discussed.

关键词： derivative vegetation indices remote sensing,vegetation status

Gas flaring cause shifts in mesophyll and stomatal functional traits of Betula pubescens Ehrh.

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Journal of Forestry Research 2023年第6期34卷 2079-2087页

作者： Dina A.Ronzhina svetlana V.Migalina Irek A.Yusupov Institute Botanic Garden Ural BranchRussian Academy of Sciences202a 8 Marta Str.EkaterinburgRussia 620144 Tyumen State University 6 Volodarskogo Str.TyumenRussia 625003

In petroleum-producing territories of West Siberia(Russia),oil well gas flares have a thermal effect on nearby plant *** communities can be used as models for studying plant acclimation to global *** the present study on the effect of the hydrothermal regime at the flare sites on mesophyll and stomatal functional traits of Betula pubescens,leaves were collected from trees at250 m(control site[CS]),200,150 and 100 m(maximum impact site[MIS])from a *** the CS to MIS site,the average annual air temperature increased by 0.5℃and bog water level decreased by 17 *** plants from the MIS,stomata were 16%smaller and density was 20%lower compared to those at the CS,resulting in lower maximum stomatal conductance in plants from the MIS(mean±SE:MIS 0.84±0.05 mol·m^(-2)s^(-1),CS 1.24±0.06 mol·m^(-2)s^(-1);F=12.6,P<0.01).Mesophyll cell volume was 1.9 times lower at MIS than at *** numbers per cell also declined with distance from the flares,from 21(MIS)to18(CS;F=15.6,P<0.001),and chloroplast volume was 24%higher at the CS,whereas the number of mesophyll cells and chloroplasts numbers per unit leaf area were 1.9 and 1.8 times higher at the MIS than at the CS,*** a result,leaves from the MIS had a large total mesophyll cell(Ames/A)and chloroplast(Achl/A)surface area per unit leaf area,resulting in a 46%increase in mesophyll conductance in plants from the ***,structural changes in leaf epidermis consisted of a decrease in stomatal size and number,could lower transpiration losses with higher temperatures and less *** compensate for the reduction in leaf conductance due to a decrease in stomatal conductance under these conditions,an increase in the number of mesophyll cells and chloroplasts per unit area provides a greater gas-exchange area and mesophyll conductance.

关键词： Leaf traits Mesophyll cell volume Chloroplast numbers Mesophyll conductance Stomatal conductance

Algorithms for automatic measurement of SIS-type hysteretic underdamped Josephson junction’s parameters by current-voltage characteristics

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Journal of Electronic Science and Technology 2023年第4期21卷 60-74页

作者： Aleksey G.Vostretsov svetlana G.Filatova Laboratory of Quantum Cryogenic Electronics Novosibirsk State Technical UniversityNovosibirsk630073Russia Chinakal Institute of Mining Siberian BranchRussian Academy of SciencesNovosibirsk630091Russia

Some electrical parameters of the SIS-type hysteretic underdamped Josephson junction(JJ)can be measured by its current-voltage characteristics(IVCs).Currents and voltages at JJ are commensurate with the intrinsic noise level of measuring *** leads to the need for multiple measurements with subsequent statistical *** this paper,the digital algorithms are proposed for the automatic measurement of the JJ parameters by *** algorithms make it possible to implement multiple measurements and check these JJ parameters in an automatic mode with the required *** complete sufficient statistics are used to minimize the root-mean-square error of parameter measurement.A sequence of current pulses with slow rising and falling edges is used to drive JJ,and synchronous current and voltage readings at JJ are used to realize measurement *** algorithm performance is estimated through computer *** significant advantage of the proposed algorithms is the independence from current source noise and intrinsic noise of current and voltage meters,as well as the simple implementation in automatic digital measuring *** proposed algorithms can be used to control JJ parameters during mass production of superconducting integrated circuits,which will improve the production efficiency and product quality.

关键词： Algorithm design and analysis Critical current Current-voltage characteristics(IVCs) Josephson junction(JJ) Measurement errors Parameter estimation