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    Challenges and opportunities for integrating lake ecosystem modelling approaches
[Text] / W.M. Mooij [et al.] // Aquat. Ecol. - 2010. - Vol. 44, Is. 3. - pp. 633-667, DOI 10.1007/s10452-010-9339-3. - Cited References: 260. - WM, RG, IP, SG, PV and AD were supported by grant 047.017.012 of the Netherlands Organization for Scientific Research (NWO) and the Russian Foundation for Basic Research (RFBR). LDSD was supported by NWO grant 817.01.007. DT and EJ were supported by EU-REFRESH, EU-WISER, CLEAR (a Villum Kann Rasmussen Centre of Excellence Project on lake restoration) and CRES. We thank Prof. Andre De Roos for his insightful comments and Dr. Tom Andersen for his contribution to the text. JJ wishes to thank Drs. T. Aldenberg, Dr. L. Van Liere, Mr. M.J. 't Hart, Ir. M.H.J.L Jeuken, Ing. S. van Tol, Ir. J.S. Sloot and many others including the many people who provided lake data, for their contributions to PCLake. This is publication 4838 of the Netherlands Institute of Ecology (NIOO-KNAW). . - ISSN 1386-2588
РУБ Ecology + Limnology + Marine & Freshwater Biology

Аннотация: A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others ('reinventing the wheel'). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available ('having tunnel vision'). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and traitbased models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its 'leading principle', there are many opportunities for combining approaches. We take the point of view that a single 'right' approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view on the functioning of lake ecosystems. We end with a set of specific recommendations that may be of help in the further development of lake ecosystem models.


Доп.точки доступа:
Mooij, W.M.; Trolle, D.; Jeppesen, E.; Arhonditsis, G.; Belolipetsky, P.V.; Белолипецкий, Павел Викторович; Chitamwebwa, D.B.R.; Degermendzhy, A.G.; DeAngelis, D.L.; Domis, L.N.D.; Downing, A.S.; Elliott, J.A.; Fragoso, C.R.; Gaedke, U.; Genova, S.N.; Генова, Светлана Николаевна; Gulati, R.D.; Hakanson, L.; Hamilton, D.P.; Hipsey, M.R.; 't Hoen, J.; Hulsmann, S.; Los, F.H.; Makler-Pick, V.; Petzoldt, T.; Prokopkin, I.G.; Rinke, K.; Schep, S.A.; Tominaga, K.; Van Dam, A.A.; Van Nes, E.H.; Wells, S.A.; Janse, J.H.

    Loss of hydrogen and oxygen from the upper atmosphere of Venus
[Text] / H. Lammer [et al.] // Planet Space Sci. - 2006. - Vol. 54, Is. 13-14. - P1445-1456, DOI 10.1016/j.pss.2006.04.022. - Cited References: 93 . - ISSN 0032-0633
РУБ Astronomy & Astrophysics

Аннотация: Atmospheric escape from the upper atmosphere of Venus is mainly influenced by the loss of hydrogen and oxygen caused by the interaction of solar radiation and particle flux with the unprotected planetary environment. Because one main aim of the ASPERA-4 particle/plasma and VEX-MAG magnetic field experiments on board of ESA's forthcoming Venus Express mission is the investigation of atmospheric erosion processes from the planet's ionosphere-exosphere environment, we study the total loss of hydrogen and oxygen and identified the efficiency of several escape mechanisms involved. For the estimation of pick up loss rates we use a gas dynamic test particle model and obtained average loss rates for H+, and O+ pick up ions of about 1 x 10(25) s(-1) and about 1.6 x 10(25) s(-1), respectively. Further, we estimate ion loss rates due to detached plasma clouds, which were observed by the pioneer Venus orbiter and may be triggered by the Kelvin-Helmholtz instability of about 0.5-1 x 10(25) s(-1). Thermal atmospheric escape processes and atmospheric loss by photo-chemically produced oxygen atoms yield negligible loss rates. Sputtering by incident pick up O+ ions give O atom loss rates in the order of about 6 x 10(24) s(-1). On the other hand, photo-chemically produced hot hydrogen atoms are a very efficient loss mechanism for hydrogen on Venus with a global average total loss rate of about 3.8 x 10(25) s(-1), which is in agreement with Donahue and Hartle [1992. Solar cycle variations in H+ and D+ densities in the Venus ionosphere: implications for escape. Geophys. Res. Lett. 12, 2449-2452] and of the same order but less than the estimated H+ ion outflow on the Venus nightside of about 7.0 x 10(25) s(-1) due to acceleration by an outward electric polarization force related to ionospheric holes by Hartle and Grebowsky [1993. Light ion flow in the nightside ionosphere of Venus. J. Geophys. Res. 98, 7437-7445]. Our study indicates that on Venus, due to its larger mass and size compared to Mars, the most relevant atmospheric escape processes of oxygen involve ions and are caused by the interaction with the solar wind. The obtained results indicate that the ratio between H/O escape to space from the Venusian upper atmosphere is about 4, and is in a much better agreement with the stoichiometrically H/O escape ratio of 2:1, which is not the case on Mars. However, a detailed analysis of the outflow of ions from the Venus upper atmosphere by the ASPERA-4 and VEX-MAG instruments aboard Venus Express will lead to more accurate atmospheric loss estimations and a better understanding of the planet's water inventory. (c) 2006 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Lammer, H.; Lichtenegger, H.I.M.; Biernat, H.K.; Erkaev, N.V.; Еркаев, Николай Васильевич; Arshukova, I.L.; Kolb, C.; Gunell, H.; Lukyanov, A.; Holmstrom, M.; Barabash, S.; Zhang, T.L.; Baumjohann, W.

    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.\

    Multistable states in the biosphere-climate system: towards conceptual models
/ S. Bartsev, P. Belolipetskii, A. Degermendzhi // V INTERNATIONAL WORKSHOP ON MATHEMATICAL MODELS AND THEIR APPLICATIONS : IOP PUBLISHING LTD, 2017. - Vol. 173: 5th International Workshop on Mathematical Models and their Applications (NOV 07-09, 2016, Krasnoyarsk, RUSSIA). - Ст. UNSP 012005. - (IOP Conference Series-Materials Science and Engineering), DOI 10.1088/1757-899X/173/1/012005. - Cited References:31. - This work was supported by grant RFBR-KKFN No 15-41-04300 and Complex Program of SB RAS No II.2. No 0360-2015-0002. . -
РУБ Materials Science, Multidisciplinary + Mathematics, Applied

Аннотация: Forecasting response of the biosphere and regional ecosystems to observed and expected climate change is the fundamental problem with obvious practical significance. Fundamental non-linearity of the climate system and biosphere makes feasible implementing multiple states and threshold processes in the biosphere-climate system (BCS) in response to gradually increasing influence factor (greenhouse gas concentrations growth). Really time series analysis of global temperature and other global and local parameters indicates the presence of abrupt transitions between stationary states. Identification of the switching mechanisms using general circulation models of the atmosphere and the ocean is associated with the obvious difficulties due to their complexity. Understanding the nature of such switches at qualitative level can be achieved by using a conceptual small-scale models. Some variants of possible mechanisms capable of generating these shifts and simultaneously supporting quasi-stationary periods between them are discussed.

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Держатели документа:
Inst Biophys SB RAS, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
Inst Computat Modelling SB RAS, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.

Доп.точки доступа:
Belolipetskii, P.V.; Белолипецкий, Павел Викторович; Degermendzhi, A.; RFBR-KKFN [15-41-04300]; Complex Program of SB RAS [II.2, 0360-2015-0002]

    Modelling the mechanical structure of extreme shear ruptures with friction approaching zero generated in brittle materials
/ B. G. Tarasov [et al.] // Int. J. Fract. - 2017. - Vol. 207, Is. 1. - P87-97, DOI 10.1007/s10704-017-0223-1. - Cited References:30. - The authors acknowledge the support provided by the Centre for Offshore Foundation Systems (COFS) at the University of Western Australia. . - ISSN 0376-9429. - ISSN 1573-2673
РУБ Materials Science, Multidisciplinary + Mechanics

Аннотация: Experiments on frictional stick-slip instability in brittle materials and natural observations show that friction falls towards zero in the head of shear ruptures propagating with extreme velocities (up to supershear levels). Although essential for understanding earthquakes, fracture mechanics and tribology the question of what physical processes determine how weakening occurs is still unclear. Here, using a mathematical model, we demonstrate that the extremely low friction can be caused by a fan-like fault structure formed on the basis of a tensile-cracking process observed in all extreme ruptures. The mathematical model visualises and describes the fan-structure as a mechanical system during rupture propagation. It explains some features observed in laboratory experiments.

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Держатели документа:
Univ Western Australia, Ctr Offshore Fdn Syst, Stirling Highway 35, Perth, WA 6009, Australia.
Russian Acad Sci, Inst Appl Math, Far Eastern Branch, Radio St 7, Vladivostok 690041, Russia.
Russian Acad Sci, Inst Computat Modelling, Siberian Branch, Akademgorodok 50-44, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Tarasov, Boris G.; Guzev, Mikhail A.; Sadovskii, Vladimir M.; Cassidy, Mark J.; Centre for Offshore Foundation Systems (COFS) at the University of Western Australia

    Diagnostics of Complex Phenomena on the Basis of Geometrical Analysis Images
/ L. Cadena [et al.] // Lecture Notes in Engineering and Computer Science : Newswood Limited, 2017. - Vol. 2227: 2017 International MultiConference of Engineers and Computer Scientists, IMECS 2017 (15 March 2017 through 17 March 2017, ) Conference code: 133365. - P401-404 . -

Кл.слова (ненормированные):
Analysis of medical images -- Contour -- Denoising -- Image processing -- Medical image -- Shearlet -- Ureteroscopy -- Urolithiasis -- Wavelets -- Diagnosis -- Geometry -- Image processing -- Medical imaging -- Contour -- De-noising -- Shearlet -- Ureteroscopy -- Urolithiasis -- Wavelets -- Image analysis

Аннотация: A review of the basic concepts shearlet transform spatial data observations. The possibilities of the new approach for the geometric analysis of complex medical images. The proposed method can improve the radiological diagnosis of urological diseases by detailing changes of tissues. On the basis of the developed method of spectral data decomposition is performed solution of filtration problem and isolating contour studied medical target. The task of image contrast is also solved for the better understanding of the found geometric features and patterns.

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Держатели документа:
Electric and Electronic Department, Universidad de las Fuerzas Armadas ESPE, Av. Gral Ruminahui s/n, Sangolqui, Ecuador
College Juan Suarez Chacon, Quito, Ecuador
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
Institute of Computational Modelling, Siberian Branch, Russian Academy of Science, 50/44 Akademgorodok str., Krasnoyarsk, Russian Federation
Krasnoyarsk State Medical University, 1 Partizana Geleznyaka str., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Cadena, L.; Cadena, F.; Kruglyakov, A.; Simonov, K.; Kapsargin, F.

    A conceptual model of abrupt shifts in the biosphere-climate system
[Text] : доклад, тезисы доклада / S. I. Bartsev, P. V. Belolipetsky, M. Y. Saltykov // 15th International Conference on Environmental Science and Technology (CEST 2017) : proceedings of the 15th International Conference on Environmental Science and Technology (CEST 2017). - Rhodes : Global Network for Environmental Science and Technology, 2017. - Ст. 01013

Кл.слова (ненормированные):
climate shifts -- multiple equilibria in climate -- staircase-like climate dynamics

Аннотация: Time series analysis of global temperature and ~70 other global and local parameters indicates the presence of abrupt shifts between stationary states. The concept of non-linear systems, which undoubtedly include the "biosphere-climate" system, makes the threshold response to gradually increasing influence factor (the increase in greenhouse gas concentrations) quite expectable. Quasi-stable regimes taking place between the shifts presume the existence of some regulation mechanism which can maintain global temperature near constant in the presence of changing external forcing.Some authors suggest regulation of surface temperatures by clouds. Understanding the nature of such shifts and stationary regimes between them at qualitative concepts can be achieved by using conceptual small-scale models. In the paper some phenomenological extension of Lorenz-84 Model devoted to low order description of atmospheric circulation accounting possible clouds feedback was considered. It was shown the model itself is able to reduce the effect of forcing changes. Involving clouds feedback increases the resistance of the model to external disturbances

РИНЦ,
Источник статьи

Держатели документа:
Institute of Biophysics, SB RAS
Institute of Computational Modelling, SB RAS

Доп.точки доступа:
Bartsev, S.I.; Belolipetsky, P.V.; Saltykov, M.Y.; 15th International Conference on Environmental Science and Technology (CEST 2017)(2017 ; 31.08 - 02.09 ; Rhodes)
Нет сведений об экземплярах (Источник в БД не найден)

    Engineering mode hybridization in regular arrays of plasmonic nanoparticles embedded in 1D photonic crystal
/ V. S. Gerasimov [et al.] // J. Quant. Spectrosc. Radiat. Transf. - 2019. - Vol. 224. - P303-308, DOI 10.1016/j.jqsrt.2018.11.028 . - ISSN 0022-4073
Аннотация: We analytically and numerically study coupling mechanisms between 1D photonic crystal (PhC) and 2D array of plasmonic nanoparticles (NPs) embedded in its defect layer. We introduce general formalism to explain and predict the emergence of PhC-mediated Wood–Rayleigh anomalies, which spectral positions agree well with the results of exact simulations with Finite-Difference Time-Domain (FDTD) method. Electromagnetic coupling between localized surface plasmon resonance (LSPR) and PhC-mediated Wood–Rayleigh anomalies makes it possible to efficiently tailor PhC modes. The understanding of coupling mechanisms in such hybrid system paves a way for optimal design of sensors, light absorbers, modulators and other types of modern photonic devices with controllable optical properties. © 2018 Elsevier Ltd

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Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Federal Siberian Research Clinical Centre under FMBA of Russia, Krasnoyarsk, 660037, Russian Federation
Polytechnic Institute, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
The Institute of Optics, University of Rochester, Rochester, NY 14627, United States
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Gerasimov, V. S.; Ershov, A. E.; Bikbaev, R. G.; Rasskazov, I. L.; Timofeev, I. V.; Polyutov, S. P.; Karpov, S. V.

    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.

    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.