[Текст] : статья / К.В. Симонов // J. of Siberian Federal University. Engineering & Technologies. - 2010. - Т.3, №.1. - С. 104-122
Доп.точки доступа:
Симонов, Константин Васильевич
Труды сотрудников ИВМ СО РАН
w10=
Найдено документов в текущей БД: 40
Computational Experiment in the Problem of the Resent Traces of Oceanic Cosmic Impacts
Instability of the joint flow of liquid film and co-current gas flow: theory and experiment
[Text] : статья / V. B. Bekezhanova, O. Kabov // Book of abstracts Sixth Int. conf. «Two-Phase Systems for Ground and Space Applications». - 2011. - p. 46
Доп.точки доступа:
Kabov, O.; Бекежанова, Виктория Бахытовна
Доп.точки доступа:
Kabov, O.; Бекежанова, Виктория Бахытовна
Four-stage computational technology with adaptive numerical methods for computational aerodynamics
/ V.Shaydurov, T.Liu, Z.Zheng // AIP Conference Proceedings. - 2012. - Vol. 1487: 4th International Conference on Application of Mathematics in Technical and Natural Sciences: Memorial Volume devoted to Prof. Christo I. Christov, AMiTaNS 2012 (11 June 2012 through 16 June 2012, St. Constantine and Helena) . - pp. 42-48, DOI 10.1063/1.4758940
. -
Кл.слова (ненормированные):
four-stage computational technology -- heat-conducting gas -- high-order solvers -- Time-dependent Navier-Stokes equations
Аннотация: Computational aerodynamics is a key technology in aircraft design which is ahead of physical experiment and complements it. Of course all three components of computational modeling are actively developed: mathematical models of real aerodynamic processes, numerical algorithms, and high-performance computing. The most impressive progress has been made in the field of computing, though with a considerable complication of computer architecture. Numerical algorithms are developed more conservative. More precisely, they are offered and theoretically justified for more simple mathematical problems. Nevertheless, computational mathematics now has amassed a whole palette of numerical algorithms that can provide acceptable accuracy and interface between modern mathematical models in aerodynamics and high-performance computers. A significant step in this direction was the European Project ADIGMA whose positive experience will be used in International Project TRISTAM for further movement in the field of computational technologies for aerodynamics. This paper gives a general overview of objectives and approaches intended to use and a description of the recommended four-stage computer technology. В© 2012 American Institute of Physics.
Scopus,
РИНЦ
Доп.точки доступа:
Liu, T.; Zheng, Z.; Шайдуров, Владимир Викторович
Кл.слова (ненормированные):
four-stage computational technology -- heat-conducting gas -- high-order solvers -- Time-dependent Navier-Stokes equations
Аннотация: Computational aerodynamics is a key technology in aircraft design which is ahead of physical experiment and complements it. Of course all three components of computational modeling are actively developed: mathematical models of real aerodynamic processes, numerical algorithms, and high-performance computing. The most impressive progress has been made in the field of computing, though with a considerable complication of computer architecture. Numerical algorithms are developed more conservative. More precisely, they are offered and theoretically justified for more simple mathematical problems. Nevertheless, computational mathematics now has amassed a whole palette of numerical algorithms that can provide acceptable accuracy and interface between modern mathematical models in aerodynamics and high-performance computers. A significant step in this direction was the European Project ADIGMA whose positive experience will be used in International Project TRISTAM for further movement in the field of computational technologies for aerodynamics. This paper gives a general overview of objectives and approaches intended to use and a description of the recommended four-stage computer technology. В© 2012 American Institute of Physics.
Scopus,
РИНЦ
Доп.точки доступа:
Liu, T.; Zheng, Z.; Шайдуров, Владимир Викторович
Dynamical modeling of microRNA action on the protein translation process
[Text] / A.Zinovyev [et al.] // BMC Syst. Biol. - 2010. - Vol. 4. - Ст. 13, DOI 10.1186/1752-0509-4-13. - Cited References: 66. - We acknowledge support from Agence Nationale de la Recherche (project ANR-08-SYSC-003 CALAMAR) and from the Projet Incitatif Collaboratif "Bioinformatics and Biostatistics of Cancer" at Institut Curie. AZ and EB are members of the team "Systems Biology of Cancer" Equipe labellis'ee par la Ligue Nationale Contre le Cancer. This work was supported by the European Commission Sixth Framework Programme Integrated Project SIROCCO contract number LSHG-CT-2006-037900. We thank Vitaly Volpert and Laurence Calzone for inspiring and useful discussions.
. - ISSN 1752-0509
РУБ Mathematical & Computational Biology
Аннотация: Background: Protein translation is a multistep process which can be represented as a cascade of biochemical reactions (initiation, ribosome assembly, elongation, etc.), the rate of which can be regulated by small non-coding microRNAs through multiple mechanisms. It remains unclear what mechanisms of microRNA action are the most dominant: moreover, many experimental reports deliver controversial messages on what is the concrete mechanism actually observed in the experiment. Nissan and Parker have recently demonstrated that it might be impossible to distinguish alternative biological hypotheses using the steady state data on the rate of protein synthesis. For their analysis they used two simple kinetic models of protein translation. Results: In contrary to the study by Nissan and Parker, we show that dynamical data allow discriminating some of the mechanisms of microRNA action. We demonstrate this using the same models as developed by Nissan and Parker for the sake of comparison but the methods developed (asymptotology of biochemical networks) can be used for other models. We formulate a hypothesis that the effect of microRNA action is measurable and observable only if it affects the dominant system (generalization of the limiting step notion for complex networks) of the protein translation machinery. The dominant system can vary in different experimental conditions that can partially explain the existing controversy of some of the experimental data. Conclusions: Our analysis of the transient protein translation dynamics shows that it gives enough information to verify or reject a hypothesis about a particular molecular mechanism of microRNA action on protein translation. For multiscale systems only that action of microRNA is distinguishable which affects the parameters of dominant system (critical parameters), or changes the dominant system itself. Dominant systems generalize and further develop the old and very popular idea of limiting step. Algorithms for identifying dominant systems in multiscale kinetic models are straightforward but not trivial and depend only on the ordering of the model parameters but not on their concrete values. Asymptotic approach to kinetic models allows putting in order diverse experimental observations in complex situations when many alternative hypotheses co-exist.
Доп.точки доступа:
Zinovyev, A.; Morozova, N.; Nonne, N.; Barillot, E.; Harel-Bellan, A.; Gorban, A.N.; Горбань, Александр Николаевич
Рубрики:
MESSENGER-RNAS
CHEMICAL-KINETICS
HUMAN-CELLS
MAMMALIAN-CELLS
LET-7 MICRORNA
INITIATION
REPRESSION
INHIBITION
GENE
MANIFOLDS
MESSENGER-RNAS
CHEMICAL-KINETICS
HUMAN-CELLS
MAMMALIAN-CELLS
LET-7 MICRORNA
INITIATION
REPRESSION
INHIBITION
GENE
MANIFOLDS
Аннотация: Background: Protein translation is a multistep process which can be represented as a cascade of biochemical reactions (initiation, ribosome assembly, elongation, etc.), the rate of which can be regulated by small non-coding microRNAs through multiple mechanisms. It remains unclear what mechanisms of microRNA action are the most dominant: moreover, many experimental reports deliver controversial messages on what is the concrete mechanism actually observed in the experiment. Nissan and Parker have recently demonstrated that it might be impossible to distinguish alternative biological hypotheses using the steady state data on the rate of protein synthesis. For their analysis they used two simple kinetic models of protein translation. Results: In contrary to the study by Nissan and Parker, we show that dynamical data allow discriminating some of the mechanisms of microRNA action. We demonstrate this using the same models as developed by Nissan and Parker for the sake of comparison but the methods developed (asymptotology of biochemical networks) can be used for other models. We formulate a hypothesis that the effect of microRNA action is measurable and observable only if it affects the dominant system (generalization of the limiting step notion for complex networks) of the protein translation machinery. The dominant system can vary in different experimental conditions that can partially explain the existing controversy of some of the experimental data. Conclusions: Our analysis of the transient protein translation dynamics shows that it gives enough information to verify or reject a hypothesis about a particular molecular mechanism of microRNA action on protein translation. For multiscale systems only that action of microRNA is distinguishable which affects the parameters of dominant system (critical parameters), or changes the dominant system itself. Dominant systems generalize and further develop the old and very popular idea of limiting step. Algorithms for identifying dominant systems in multiscale kinetic models are straightforward but not trivial and depend only on the ordering of the model parameters but not on their concrete values. Asymptotic approach to kinetic models allows putting in order diverse experimental observations in complex situations when many alternative hypotheses co-exist.
Доп.точки доступа:
Zinovyev, A.; Morozova, N.; Nonne, N.; Barillot, E.; Harel-Bellan, A.; Gorban, A.N.; Горбань, Александр Николаевич
Visual Modeling of Dynamical Systems by Instrumental Facilities
[Text] : статья / Yu. V. Shornikov, E. A. Novikov, D. N. Dostovalov, M. S. Myssak // VII IFAC Symposium on Manufacturing Modelling, Management and Control. - Saint Petersburg, 2013. - p. 2185−2190. - (Manufacturing Modelling, Management, and Control ; vol. 7, pt. 1), DOI 10.3182/20130619-3-RU-3018.00252
. - ISBN 978-3-902823-35-9
Кл.слова (ненормированные):
Discrete-continuous system -- block diagrams -- subsystems -- data import -- active experiment -- numerical methods
Аннотация: Peculiarities of computer analysis of discrete-continuous systems in the simulation environment are reviewed. Union of standard elements in the macro blocks and import of nonlinear functions from external applications are used to build block diagrams. Solver is configured for numerical analysis of stiff systems by original methods and supplemented with tools of active computational experiment.
Полный текст
Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44
Доп.точки доступа:
Novikov, E.A.; Новиков, Евгений Александрович; Dostovalov, D.N.; Myssak, M.S.; Шорников Ю.В.
Кл.слова (ненормированные):
Discrete-continuous system -- block diagrams -- subsystems -- data import -- active experiment -- numerical methods
Аннотация: Peculiarities of computer analysis of discrete-continuous systems in the simulation environment are reviewed. Union of standard elements in the macro blocks and import of nonlinear functions from external applications are used to build block diagrams. Solver is configured for numerical analysis of stiff systems by original methods and supplemented with tools of active computational experiment.
Полный текст
Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44
Доп.точки доступа:
Novikov, E.A.; Новиков, Евгений Александрович; Dostovalov, D.N.; Myssak, M.S.; Шорников Ю.В.
Experimental Evidence of Thermal Vibrational Convection in a Nonuniformly Heated Fluid in a Reduced Gravity Environment
[Text] : статья / A. Mialdun [et al.] // Physical review letters. - 2008. - Vol. 101. - Ст. 084501DOI 10.1103/PhysRevLett.101.084501
. -
Аннотация: We report experimental evidence of convection caused by translational vibration of nonuniformly heated fluid in low gravity. The theory of vibrational convection in weightlessness is well developed but direct experimental proof has been missing. An innovative point of the experiment is the observation of a temperature field in the front and side views of the cubic cell. In addition, particle tracing is employed. The evolution of this field is studied systematically in a wide range of frequencies and amplitudes. The flow structures reported in previous numerical studies are confirmed. The transition from four-vortex flow to the pattern with three vortices is observed in the transient state.
Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44
Доп.точки доступа:
Mialdun, A.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Melnikov, D.E.; Shevtsova, V.
Аннотация: We report experimental evidence of convection caused by translational vibration of nonuniformly heated fluid in low gravity. The theory of vibrational convection in weightlessness is well developed but direct experimental proof has been missing. An innovative point of the experiment is the observation of a temperature field in the front and side views of the cubic cell. In addition, particle tracing is employed. The evolution of this field is studied systematically in a wide range of frequencies and amplitudes. The flow structures reported in previous numerical studies are confirmed. The transition from four-vortex flow to the pattern with three vortices is observed in the transient state.
Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44
Доп.точки доступа:
Mialdun, A.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Melnikov, D.E.; Shevtsova, V.
Thermovibrational Convection in Microgravity: Preparation of a Parabolic Flight Experiment
[Text] : статья / D. E. Melnikov [et al.] // Microgravity Science and Technology. - 2008. - Vol. 20, Iss. 1. - p. 29-39, DOI 10.1007/s12217-008-9011-x
. - ISSN 0938-0108
Аннотация: This work describes the preparation of the future experiments on thermovibrational convection in microgravity during parabolic flights. The experimental setup for observing thermovibrational flows is designed. It consists of a cubic cell with liquid, which is subjected to controlled vibration, and equipment for registering velocity and temperature fields with a help of optical digital interferometry. The question of choosing working liquid and control parameters of the experiment is addressed. A 3D numerical simulation of thermovibrational convection in a cubic cavity is performed for real parabolic flight conditions. The study is aimed at estimating the values of physical quantities that manifest the presence of thermovibrational flows and can be experimentally measured during short microgravity time (20 s).
Полный текст на сайте журнала
Доп.точки доступа:
Melnikov, D.E.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Mialdun, A.; Shevtsova, V.
Аннотация: This work describes the preparation of the future experiments on thermovibrational convection in microgravity during parabolic flights. The experimental setup for observing thermovibrational flows is designed. It consists of a cubic cell with liquid, which is subjected to controlled vibration, and equipment for registering velocity and temperature fields with a help of optical digital interferometry. The question of choosing working liquid and control parameters of the experiment is addressed. A 3D numerical simulation of thermovibrational convection in a cubic cavity is performed for real parabolic flight conditions. The study is aimed at estimating the values of physical quantities that manifest the presence of thermovibrational flows and can be experimentally measured during short microgravity time (20 s).
Полный текст на сайте журнала
Доп.точки доступа:
Melnikov, D.E.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Mialdun, A.; Shevtsova, V.
The IVIDIL experiment onboard the ISS: Thermodiffusion in the presence of controlled vibrations
[Text] : статья / V. Shevtsova [et al.] // Comptes Rendus Mécanique. - 2011. - Vol. 339, Iss. 5. - p. 310–317DOI 10.1016/j.crme.2011.03.007
. -
Кл.слова (ненормированные):
Diffusion -- Thermodiffusion -- Soret effect -- Vibrations -- Microgravity -- Experiment -- Interferometry
Аннотация: The IVIDIL (Influence of VIbrations on DIffusion in Liquids) experiment was aimed at utilizing the International Space Station for investigating the effects of vibrations on liquid diffusion and thermodiffusion. The SODI-IVIDIL project of ESA is gathering together European, Canadian and Russian researchers with complementary skills to prepare and carry out the experiment, to process the raw data and perform numerical modeling of the phenomena. The experiment IVIDIL started on the October 5, 2009. In total 55 experimental runs were successfully completed by 20 January, 2010. A general description of the ISS facility related to the diffusion experiments and accessible for European researchers is briefly presented and some details about IVIDIL instrument are given. The scientific interest of this short article is focused on one of the objectives of the experiment: performing precise measurements of diffusion and thermodiffusion coefficients for binary mixtures in the absence of gravity. We demonstrate possibility of the experimental environment and report on the first results related to measurements of mass transport coefficients in the mixture with the negative Soret effect: 10% isopropanol (IPA)–90% water.
Полный текст на сайте правообладателя
Доп.точки доступа:
Shevtsova, V.; Mialdun, A.; Melnikov, D.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Saghir, Z.; Lyubimova, T.; Legros, J.C.
Кл.слова (ненормированные):
Diffusion -- Thermodiffusion -- Soret effect -- Vibrations -- Microgravity -- Experiment -- Interferometry
Аннотация: The IVIDIL (Influence of VIbrations on DIffusion in Liquids) experiment was aimed at utilizing the International Space Station for investigating the effects of vibrations on liquid diffusion and thermodiffusion. The SODI-IVIDIL project of ESA is gathering together European, Canadian and Russian researchers with complementary skills to prepare and carry out the experiment, to process the raw data and perform numerical modeling of the phenomena. The experiment IVIDIL started on the October 5, 2009. In total 55 experimental runs were successfully completed by 20 January, 2010. A general description of the ISS facility related to the diffusion experiments and accessible for European researchers is briefly presented and some details about IVIDIL instrument are given. The scientific interest of this short article is focused on one of the objectives of the experiment: performing precise measurements of diffusion and thermodiffusion coefficients for binary mixtures in the absence of gravity. We demonstrate possibility of the experimental environment and report on the first results related to measurements of mass transport coefficients in the mixture with the negative Soret effect: 10% isopropanol (IPA)–90% water.
Полный текст на сайте правообладателя
Доп.точки доступа:
Shevtsova, V.; Mialdun, A.; Melnikov, D.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Saghir, Z.; Lyubimova, T.; Legros, J.C.
Influence vibration on diffusion and thermodiffusion in liquids: IVIDIL experiment on the ISS
[Text] : тезисы / V.Shevtsova [et al.] // Abstracts of 4-th Int. symp. on Physical Sciences in Space. - 2011. - p. 36
Доп.точки доступа:
Shevtsova, V.; Sechenyh, V.; Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Melnikov, D.; Mialdun, A.; Mazzoni, S.
Доп.точки доступа:
Shevtsova, V.; Sechenyh, V.; Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Melnikov, D.; Mialdun, A.; Mazzoni, S.
Method of decomposition of the interval of the values of random variables based on results of optimization of the nonparametric estimate of the probability density
/ A. V. Lapko, V. A. Lapko // Optoelectron. Instrum. Data Proces. - 2014. - Vol. 50, Is. 4. - P383-388, DOI 10.3103/S8756699014040098
. - ISSN 8756-6990
Кл.слова (ненормированные):
computational experiment -- method of decomposition -- nonparametric estimate -- Pearson test -- probability density -- testing hypotheses -- Computational experiment -- Non-parametric estimates -- Probability densities -- Testing hypothesis
Аннотация: A new method of decomposition of the interval of the values of random variables based on results of optimization of the nonparametric estimate of the probability density of the Rosenblatt-Parzen type is proposed. Its application in the problem of testing the hypothesis of identity of the distribution laws of two sequences of one-dimensional random variables is considered.
Scopus
Держатели документа:
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, building 44Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety “Krasnoyarskii rabochii” 31Krasnoyarsk, Russian Federation
Доп.точки доступа:
Lapko, V.A.; Лапко, Василий Александрович; Лапко, Александр Васильевич
Кл.слова (ненормированные):
computational experiment -- method of decomposition -- nonparametric estimate -- Pearson test -- probability density -- testing hypotheses -- Computational experiment -- Non-parametric estimates -- Probability densities -- Testing hypothesis
Аннотация: A new method of decomposition of the interval of the values of random variables based on results of optimization of the nonparametric estimate of the probability density of the Rosenblatt-Parzen type is proposed. Its application in the problem of testing the hypothesis of identity of the distribution laws of two sequences of one-dimensional random variables is considered.
Scopus
Держатели документа:
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, building 44Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety “Krasnoyarskii rabochii” 31Krasnoyarsk, Russian Federation
Доп.точки доступа:
Lapko, V.A.; Лапко, Василий Александрович; Лапко, Александр Васильевич
Plants rhizospheric organisms interaction in a manmade system with and without biogenous element limitation
[Text] / L. A. Somova [et al.] // LIFE SCIENCES: LIFE SUPPORT SYSTEMS STUDIES-I. Ser. ADVANCES IN SPACE RESEARCH : PERGAMON PRESS LTD, 1997. - Vol. 20: F4.6, F4.8, F4.2 and F4.9 Symposia of COSPAR Scientific Commission F on Life Sciences - Life Support System Studies-I, at the 31st COSPAR Scientific Assembly (JUL 14-SEP 21, 1996, BIRMINGHAM, ENGLAND), Is. 10. - P1939-1943, DOI 10.1016/S0273-1177(97)00629-7. - Cited References: 7
. - ISBN 0273-1177. - ISBN 0-08-043307-3
РУБ Engineering, Aerospace + Astronomy & Astrophysics + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences
Аннотация: The effect has been studied of inoculation of seeds of wheat with two species of rhizospheric microorganisms, Pseudomonas fluorescens and Pseudomonas putida - on young plant growth with complete and with nitrogen deficit mineral nutrition. With complete mineral medium, plants grown from seeds inoculated with bacteria of Pseudomonas genus (experiment plants) have been found to have better growth over plants not inoculated with these bacteria (control plants). The experiment plants had increased transpiration and their biomass had higher organic nitrogen content. With nitrogen deficit medium, the plants inoculated with bacteria and those without them, have not revealed changes in growth. Neither case demonstrated competition of microorganisms with plants for nitrogen sources. (C) 1997 COSPAR. Published by Elsevier Science Ltd.
WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 6600036, Russia
CEA Cadarache, DEVM, F-13108 St Paul Durance, France
Russian Acad Sci, Ctr Comp, Siberian Branch, Krasnoyarsk 6600036, Russia
ИБФ СО РАН
ИВМ СО РАН
Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.; Polonsky, V.I.; Pisman, T.I.; Sarangova, A.B.; Andre, M.; Sadovskaya, G.M.; Садовская, Галина Михайловна
Аннотация: The effect has been studied of inoculation of seeds of wheat with two species of rhizospheric microorganisms, Pseudomonas fluorescens and Pseudomonas putida - on young plant growth with complete and with nitrogen deficit mineral nutrition. With complete mineral medium, plants grown from seeds inoculated with bacteria of Pseudomonas genus (experiment plants) have been found to have better growth over plants not inoculated with these bacteria (control plants). The experiment plants had increased transpiration and their biomass had higher organic nitrogen content. With nitrogen deficit medium, the plants inoculated with bacteria and those without them, have not revealed changes in growth. Neither case demonstrated competition of microorganisms with plants for nitrogen sources. (C) 1997 COSPAR. Published by Elsevier Science Ltd.
WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 6600036, Russia
CEA Cadarache, DEVM, F-13108 St Paul Durance, France
Russian Acad Sci, Ctr Comp, Siberian Branch, Krasnoyarsk 6600036, Russia
ИБФ СО РАН
ИВМ СО РАН
Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.; Polonsky, V.I.; Pisman, T.I.; Sarangova, A.B.; Andre, M.; Sadovskaya, G.M.; Садовская, Галина Михайловна
Plants-rhizospheric organisms interaction in a manmade system with and without biogenous element limitation
/ L. A. Somova [et al.] // Advances in Space Research. - 1997. - Vol. 20, Is. 10. - P1939-1943
. - ISSN 0273-1177
Кл.слова (ненормированные):
nitrogen -- article -- bacterial count -- biomass -- comparative study -- culture medium -- growth, development and aging -- metabolism -- microbiology -- plant leaf -- plant root -- plant seed -- Pseudomonas fluorescens -- Pseudomonas putida -- wheat -- Biomass -- Colony Count, Microbial -- Culture Media -- Nitrogen -- Plant Leaves -- Plant Roots -- Pseudomonas fluorescens -- Pseudomonas putida -- Seeds -- Triticum
Аннотация: The effect has been studied of inoculation of seeds of wheat with two species of rhizospheric microorganisms, -Pseudomonas fluorescens and Pseudomonas putida - on young plant growth with complete and with nitrogen deficit mineral nutrition. With complete mineral medium, plants grown from seeds inoculated with bacteria of Pseudomonas genus (experiment plants) have been found to have better growth over plants not inoculated with these bacteria (control plants). The experiment plants had increased transpiration and their biomass had higher organic nitrogen content. With nitrogen deficit medium, the plants inoculated with bacteria and those without them, have not revealed changes in growth. Neither case demonstrated competition of microorganisms with plants for nitrogen sources. В© 1997 COSPAR. Published by Elsevier Science Ltd.
Scopus
Держатели документа:
Institute of Biophysics, Krasnoyarsk 6600036, Russian Federation
CEA-Sciences du Vivant, DEVM, CEA/Cadarache, Saint-Paul-Lez-Durance Cedex, France
Computing Center Russian, Krasnoyarsk 6600036, Russian Federation
ИВМ СО РАН
ИБФ СО РАН
Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.; Polonsky, V.I.; Pisman, T.I.; Sarangova, A.B.; Andre, M.; Sadovskaya, G.M.; Садовская, Галина Михайловна
Кл.слова (ненормированные):
nitrogen -- article -- bacterial count -- biomass -- comparative study -- culture medium -- growth, development and aging -- metabolism -- microbiology -- plant leaf -- plant root -- plant seed -- Pseudomonas fluorescens -- Pseudomonas putida -- wheat -- Biomass -- Colony Count, Microbial -- Culture Media -- Nitrogen -- Plant Leaves -- Plant Roots -- Pseudomonas fluorescens -- Pseudomonas putida -- Seeds -- Triticum
Аннотация: The effect has been studied of inoculation of seeds of wheat with two species of rhizospheric microorganisms, -Pseudomonas fluorescens and Pseudomonas putida - on young plant growth with complete and with nitrogen deficit mineral nutrition. With complete mineral medium, plants grown from seeds inoculated with bacteria of Pseudomonas genus (experiment plants) have been found to have better growth over plants not inoculated with these bacteria (control plants). The experiment plants had increased transpiration and their biomass had higher organic nitrogen content. With nitrogen deficit medium, the plants inoculated with bacteria and those without them, have not revealed changes in growth. Neither case demonstrated competition of microorganisms with plants for nitrogen sources. В© 1997 COSPAR. Published by Elsevier Science Ltd.
Scopus
Держатели документа:
Institute of Biophysics, Krasnoyarsk 6600036, Russian Federation
CEA-Sciences du Vivant, DEVM, CEA/Cadarache, Saint-Paul-Lez-Durance Cedex, France
Computing Center Russian, Krasnoyarsk 6600036, Russian Federation
ИВМ СО РАН
ИБФ СО РАН
Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.; Polonsky, V.I.; Pisman, T.I.; Sarangova, A.B.; Andre, M.; Sadovskaya, G.M.; Садовская, Галина Михайловна
Experimental and numerical analysis of mass transfer in a binary mixture with Soret effect in the presence of weak convection
[Text] / Y. . Gaponenko, A. . Mialdun, V. . Shevtsova // Eur. Phys. J. E. - 2014. - Vol. 37, Is. 10. - Ст. 90, DOI 10.1140/epje/i2014-14090-5. - Cited References: 18. - This work is supported by the PRODEX programme of the Belgian Federal Science Policy Office and ESA.
. - ISSN 1292-8941. - ISSN 1292-895X
РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Physics, Applied + Polymer Science
Аннотация: One of the targets of the experiment IVIDIL (Influence Vibrations on Diffusion in Liquids) conducted on-board ISS was to study the response of binary mixtures to vibrational forcing when the density gradient results from thermal and compositional variations. Compositional variations were created by the Soret effect and can strengthen or weaken the overall density gradient and, consequently, the response to vibrational forcing. We present the results of two experimental runs conducted on-board ISS in the frame of the experiment IVIDIL for low and strong vibrational forcing. The experimental observations revealed that a significant mean flow is set within 2 minutes after imposing vibrations and later in time it varies weakly and slowly due to the Soret effect. A mathematical model has been developed to compute the thermal and concentration fields in the experiment IVIDIL and verify the accuracy of picture processing based on the classical approach used in non-convective systems with the Soret effect. The effect of temperature and concentrations perturbations by joint action of vibrational convection and Soret effect on long time scale are carefully examined. The model demonstrates that image processing used for non-convective systems is suitable for the systems with vibration-affected thermodiffusion experiment.
WOS
Держатели документа:
[Gaponenko, Y.
Mialdun, A.
Shevtsova, V.] Univ Libre Bruxelles, MRC, EP CP 165 62, B-1050 Brussels, Belgium
[Gaponenko, Y.] Inst Computat Modelling SB RAS, Krasnoyarsk 660036, Russia
ИВМ СО РАН
Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Mialdun, A.; Shevtsova, V.; PRODEX programme of the Belgian Federal Science Policy Office; ESA
Аннотация: One of the targets of the experiment IVIDIL (Influence Vibrations on Diffusion in Liquids) conducted on-board ISS was to study the response of binary mixtures to vibrational forcing when the density gradient results from thermal and compositional variations. Compositional variations were created by the Soret effect and can strengthen or weaken the overall density gradient and, consequently, the response to vibrational forcing. We present the results of two experimental runs conducted on-board ISS in the frame of the experiment IVIDIL for low and strong vibrational forcing. The experimental observations revealed that a significant mean flow is set within 2 minutes after imposing vibrations and later in time it varies weakly and slowly due to the Soret effect. A mathematical model has been developed to compute the thermal and concentration fields in the experiment IVIDIL and verify the accuracy of picture processing based on the classical approach used in non-convective systems with the Soret effect. The effect of temperature and concentrations perturbations by joint action of vibrational convection and Soret effect on long time scale are carefully examined. The model demonstrates that image processing used for non-convective systems is suitable for the systems with vibration-affected thermodiffusion experiment.
WOS
Держатели документа:
[Gaponenko, Y.
Mialdun, A.
Shevtsova, V.] Univ Libre Bruxelles, MRC, EP CP 165 62, B-1050 Brussels, Belgium
[Gaponenko, Y.] Inst Computat Modelling SB RAS, Krasnoyarsk 660036, Russia
ИВМ СО РАН
Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Mialdun, A.; Shevtsova, V.; PRODEX programme of the Belgian Federal Science Policy Office; ESA
Construction of confidence boundaries for the decision function in a two-alternative problem of pattern recognition
/ A. V. Lapko, V. A. Lapko // Optoelectron. Instrum. Data Proces. - 2015. - Vol. 51, Is. 4. - P372-377, DOI 10.3103/S875669901504007X
. - ISSN 8756-6990
Кл.слова (ненормированные):
confidence estimate -- decision function -- Heinhold–Gaede rule -- nonparametric estimate -- pattern recognition -- Bayesian -- Computational experiment -- confidence estimate -- Decision functions -- Learning samples -- Non-parametric estimates -- Probabilistic characteristics -- Pattern recognition
Аннотация: A nonparametric estimate of the decision function in a two-alternative problem of pattern recognition is considered. The principle of expansion of the learning sample and the analysis of the probabilistic characteristics of the obtained sets of random variables are used to synthesize this estimate. On this basis, a technique of construction of confidence boundaries for the Bayesian equation of the separating surface is derived. The efficiency of this technique is proved by results of computational experiments. © 2015, Allerton Press, Inc.
Scopus
Держатели документа:
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, building 44, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety “Krasnoyarskii rabochii” 31, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Lapko, V. A.; Лапко, Василий Александрович; Лапко, Александр Васильевич
Кл.слова (ненормированные):
confidence estimate -- decision function -- Heinhold–Gaede rule -- nonparametric estimate -- pattern recognition -- Bayesian -- Computational experiment -- confidence estimate -- Decision functions -- Learning samples -- Non-parametric estimates -- Probabilistic characteristics -- Pattern recognition
Аннотация: A nonparametric estimate of the decision function in a two-alternative problem of pattern recognition is considered. The principle of expansion of the learning sample and the analysis of the probabilistic characteristics of the obtained sets of random variables are used to synthesize this estimate. On this basis, a technique of construction of confidence boundaries for the Bayesian equation of the separating surface is derived. The efficiency of this technique is proved by results of computational experiments. © 2015, Allerton Press, Inc.
Scopus
Держатели документа:
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, building 44, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety “Krasnoyarskii rabochii” 31, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Lapko, V. A.; Лапко, Василий Александрович; Лапко, Александр Васильевич
An efficient water model for large scale molecular dynamics simulations
/ V. E. Zalizniak // J. Sib. Fed. Univ. Math. Phys. - 2015. - Vol. 8, Is. 4. - P487-496, DOI 10.17516/1997-1397-2015-8-4-487-496
. - ISSN 1997-1397
Аннотация: The development of simple and efficient model that correctly represent the important features of water is essential to overcome the limitations in time scale and system size currently encountered in atomistic molecular dynamics simulations. The proposed one site model includes Lennard-Jones interaction and the angular averaged dipole-dipole interaction. Experimental data of liquid water at various temperatures are used for parametrization of the model. The values of density were chosen as primary target properties. These properties cover a temperature range from 300 to 350 K and pressures up to 10.1 MPa. The model properties are compared with those obtained from experiment and from general purpose TIP4P/2005 model. The comparison shows that all chosen properties are quite well reproduced by the proposed model. Computational scheme that is used in simulations is also presented. The proposed water model repro- duces the key characteristics of liquid water while being computationally considerably more efficient than standard multi-site atomistic water models. The model is for use on large scale simulations of the fluid behavior in nanosized structures. © Siberian Federal University. All rights reserved.
Scopus
Держатели документа:
Institute of Mathematics and Computer Science, Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Computational Modelling SB RAS, Akademgorodok, 50/44, Krasnoyarsk, Russian Federation
Аннотация: The development of simple and efficient model that correctly represent the important features of water is essential to overcome the limitations in time scale and system size currently encountered in atomistic molecular dynamics simulations. The proposed one site model includes Lennard-Jones interaction and the angular averaged dipole-dipole interaction. Experimental data of liquid water at various temperatures are used for parametrization of the model. The values of density were chosen as primary target properties. These properties cover a temperature range from 300 to 350 K and pressures up to 10.1 MPa. The model properties are compared with those obtained from experiment and from general purpose TIP4P/2005 model. The comparison shows that all chosen properties are quite well reproduced by the proposed model. Computational scheme that is used in simulations is also presented. The proposed water model repro- duces the key characteristics of liquid water while being computationally considerably more efficient than standard multi-site atomistic water models. The model is for use on large scale simulations of the fluid behavior in nanosized structures. © Siberian Federal University. All rights reserved.
Scopus
Держатели документа:
Institute of Mathematics and Computer Science, Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation
Institute of Computational Modelling SB RAS, Akademgorodok, 50/44, Krasnoyarsk, Russian Federation
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
РИНЦ,
Источник статьи
Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Mialdun, A.; 63rd International Astronautical Congress 2012, IAC 2012 (2012 ; 01.10 - 05.10 ; Naples)
РИНЦ,
Источник статьи
Доп.точки доступа:
Gaponenko, Y.; Гапоненко, Юрий Анатольевич; Mialdun, A.; 63rd International Astronautical Congress 2012, IAC 2012 (2012 ; 01.10 - 05.10 ; Naples)
Contribution to the benchmark for ternary mixtures: Measurement of diffusion and Soret coefficients in 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane onboard the ISS
/ O. A. Khlybov, I. I. Ryzhkov, T. P. Lyubimova // Eur. Phys. J. E. - 2015. - Vol. 38, Is. 4, DOI 10.1140/epje/i2015-15029-0
. - ISSN 1292-8941
Кл.слова (ненормированные):
Topical Issue: Thermal non-equilibrium phenomena in multi-component fluids -- Benzene -- Data handling -- Eigenvalues and eigenfunctions -- Interferometry -- Laser beams -- Mixtures -- Refractive index -- Diffusion matrices -- Digital interferometries -- Interferometric images -- Multicomponent fluid -- Optical beam deflection -- Soret coefficients -- Spatial variations -- Temporal and spatial evolutions -- Diffusion
Аннотация: Abstract: The paper is devoted to processing the data of DCMIX 1 space experiment. In this experiment, the Optical digital interferometry was used to measure the diffusion and Soret coefficients in the ternary mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene and n-dodecane at mass fractions of 0.8/0.1/0.1 and at 25°C. The raw interferometric images were processed to obtain the temporal and spatial evolution of refractive indices for two laser beams of different wavelengths. The method for extracting the diffusion and thermal diffusion coefficients originally developed for optical beam deflection was extended to optical digital interferometry allowing for the spatial variation of refractive index along the diffusion path. The method was validated and applied to processing the data for Soret and diffusion steps in 5 experimental runs. The obtained results for the Soret coefficients and one of the eigenvalues of diffusion matrix showed acceptable agreement within each step. The second eigenvalue was not determined with sufficient accuracy. Graphical abstract: [Figure not available: see fulltext.]. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Scopus
Держатели документа:
Institute of Continuous Media Mechanics, UB RAS, Koroleva St. 1Perm, Russian Federation
Institute of Computational Modelling, SB RASAkademgorodok, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Ryzhkov, I.I.; Рыжков, Илья Игоревич; Lyubimova, T.P.
Кл.слова (ненормированные):
Topical Issue: Thermal non-equilibrium phenomena in multi-component fluids -- Benzene -- Data handling -- Eigenvalues and eigenfunctions -- Interferometry -- Laser beams -- Mixtures -- Refractive index -- Diffusion matrices -- Digital interferometries -- Interferometric images -- Multicomponent fluid -- Optical beam deflection -- Soret coefficients -- Spatial variations -- Temporal and spatial evolutions -- Diffusion
Аннотация: Abstract: The paper is devoted to processing the data of DCMIX 1 space experiment. In this experiment, the Optical digital interferometry was used to measure the diffusion and Soret coefficients in the ternary mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene and n-dodecane at mass fractions of 0.8/0.1/0.1 and at 25°C. The raw interferometric images were processed to obtain the temporal and spatial evolution of refractive indices for two laser beams of different wavelengths. The method for extracting the diffusion and thermal diffusion coefficients originally developed for optical beam deflection was extended to optical digital interferometry allowing for the spatial variation of refractive index along the diffusion path. The method was validated and applied to processing the data for Soret and diffusion steps in 5 experimental runs. The obtained results for the Soret coefficients and one of the eigenvalues of diffusion matrix showed acceptable agreement within each step. The second eigenvalue was not determined with sufficient accuracy. Graphical abstract: [Figure not available: see fulltext.]. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Scopus
Держатели документа:
Institute of Continuous Media Mechanics, UB RAS, Koroleva St. 1Perm, Russian Federation
Institute of Computational Modelling, SB RASAkademgorodok, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Ryzhkov, I.I.; Рыжков, Илья Игоревич; Lyubimova, T.P.
Computing experiment of the space body flight through the Earth atmosphere
[Text] : статья / G. I. Shchepanovskaya // Решетневские чтения. - 2015. - Т. 2, № 19. - P112-113
. - ISSN 1990-7702
Перевод заглавия: Вычислительный эксперимент полёта космического тела в атмосфере Земли
Кл.слова (ненормированные):
уравнения Навье-Стокс -- метод конечных элементов -- Navier-Stokes equation -- semi-Lagrangian approximation -- Viscous heat-conducting gas -- friable asteroid-comet body -- Conforming finite element method -- вязкий теплопроводный газ -- астероидно-кометное тело -- полуЛагранжевый метод
Аннотация: In the paper, the mathematical model and numerical algorithm are proposed for modeling the complex of phenomena which accompany the passage of a friable asteroid-comet body through the Earth atmosphere.
Рассмотрено предсказание процессов взаимодействия астероидно-кометных тел с атмосферой Земли. Прохождение кометных осколков, а также дробящихся, аморфных, пылевых тел вызывает множество незакрытых вопросов, порождающих экзотические объяснения сопровождающих явлений.
РИНЦ
Держатели документа:
Institute of Computational Modeling SB RAS
Доп.точки доступа:
Щепановская, Галина Ивановна
Перевод заглавия: Вычислительный эксперимент полёта космического тела в атмосфере Земли
| УДК |
Кл.слова (ненормированные):
уравнения Навье-Стокс -- метод конечных элементов -- Navier-Stokes equation -- semi-Lagrangian approximation -- Viscous heat-conducting gas -- friable asteroid-comet body -- Conforming finite element method -- вязкий теплопроводный газ -- астероидно-кометное тело -- полуЛагранжевый метод
Аннотация: In the paper, the mathematical model and numerical algorithm are proposed for modeling the complex of phenomena which accompany the passage of a friable asteroid-comet body through the Earth atmosphere.
Рассмотрено предсказание процессов взаимодействия астероидно-кометных тел с атмосферой Земли. Прохождение кометных осколков, а также дробящихся, аморфных, пылевых тел вызывает множество незакрытых вопросов, порождающих экзотические объяснения сопровождающих явлений.
РИНЦ
Держатели документа:
Institute of Computational Modeling SB RAS
Доп.точки доступа:
Щепановская, Галина Ивановна
The mathematical modeling of grouping the dipole water clusters
/ V. Shaidurov, V. Kornienko, A. Vyatkin ; ed.: A. . Ashyralyev, A. . Lukashov // INTERNATIONAL CONFERENCE ON ANALYSIS AND APPLIED MATHEMATICS (ICAAM : AMER INST PHYSICS, 2016. - Vol. 1759: 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (SEP 07-10, 2016, Almaty, KAZAKHSTAN). - Ст. 020004. - (AIP Conference Proceedings), DOI 10.1063/1.4959618. - Cited References:4
. -
РУБ Mathematics, Applied + Physics, Applied
Кл.слова (ненормированные):
Electric dipole -- Water clusters -- Physical-mathematical model -- Computational experiment -- Runge-Kutta methods
Аннотация: In the present paper, a physical-mathematical model and a computational algorithm implementing the model are proposed to study the behavior of particles having an electric dipole moment in an external electric field. Computational experiments demonstrate the orientation dynamics of water clusters with the increase of the generated field. The dipole properties of some water clusters were previously determined using Hyperchem program.
WOS,
Смотреть статью,
Scopus
Держатели документа:
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Shaidurov, V.V.; Шайдуров, Владимир Викторович; Kornienko, Viktoria; Vyatkin, Alexander; Ashyralyev, A... \ed.\; Lukashov, A... \ed.\
Кл.слова (ненормированные):
Electric dipole -- Water clusters -- Physical-mathematical model -- Computational experiment -- Runge-Kutta methods
Аннотация: In the present paper, a physical-mathematical model and a computational algorithm implementing the model are proposed to study the behavior of particles having an electric dipole moment in an external electric field. Computational experiments demonstrate the orientation dynamics of water clusters with the increase of the generated field. The dipole properties of some water clusters were previously determined using Hyperchem program.
WOS,
Смотреть статью,
Scopus
Держатели документа:
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Shaidurov, V.V.; Шайдуров, Владимир Викторович; Kornienko, Viktoria; Vyatkin, Alexander; Ashyralyev, A... \ed.\; Lukashov, A... \ed.\
629.12.03 (075.8)
П429
П429
ПОВЫШЕНИЕ ЧИСТОТЫ ПОВЕРХНОСТИ МЕТАЛЛОИЗДЕЛИЙ С ПРИМЕНЕНИЕМ НАНОТЕХНОЛОГИЙ
[Текст] : статья / Г. Г. Крушенко // Вестник Сибирского государственного аэрокосмического университета им. академика М.Ф. Решетнева. - 2016. - Т. 17, № 2. - С. 484-489
. - ISSN 1816-9724
Перевод заглавия: INCREASE OF THE PURITY OF METAL PRODUCTS SURFACES WITH APPLICATION OF NANOTECHNOLOGIES
Кл.слова (ненормированные):
турбонасосный агрегат -- рабочие колеса -- шероховатость -- нанопорошки -- turbopomp assembly -- work wheels -- surface roughness -- nanopowders
Аннотация: Известно, что качество поверхности металлоизделий механизмов и машин, оцениваемое по величине шероховатости, существенно влияет на их эксплуатационные характеристики. Это касается и рабочих колес (РК) турбонасосных агрегатов (ТНА) жидкостных ракетных двигателей (ЖРД), отливаемых из жаропрочных сплавов, так как этот показатель существенно влияет на объемную подачу компонентов топлива. Однако в связи с трудностями проведения натурного эксперимента на ЖРД в работе были использованы данные, полученные на судовом гребном винте (ГВ), отливаемом из стали, между геометрий которого и функциями РК ТНА имеется определенное сходство. Сходство имеется и в технологиях их изготовления. И те, и другие, во-первых, изготавливают литьем: РК ТНА - способом литья по выплавляемым моделям, ГВ - литьем в песчано-глинистые формы; во-вторых, имеется и сходство в материалах литейных форм: в обоих случаях их основой является песок, а вторым компонентом - жидкое связующее. При этом при литье в песчано-глинистые формы детали зачастую поражаются пригаром - прочно сцепленной с телом отливки коркой, образующейся в результате проникновения жидкого металла в поры между зернами песка формы, которую впоследствии удаляют разными способами, как правило, с ухудшением чистоты поверхности. С целью уменьшения пригара рабочие поверхности форм покрывают огнеупорными красками, представляющими собой суспензии из порошкового наполнителя (графит, пылевидный кварц и др.). Однако применение таких красок не предупреждает образование на отливках пригара из-за крупности частиц наполнителей. В работе использованы противопригарные краски, содержащие нанопорошки тугоплавких химических соединений. При использовании таких покрытий практически полностью предотвращается образование пригара на стальных отливках, включая и описанный в работе судовой гребной винт, и, как результат, повышается чистота и улучшается качество поверхности. Полученные результаты можно использовать при изготовлении форм при литье по выплавляемым моделям РК ТНА.
It is known that the quality of the surface of metal products machinery and equipment measured at the value of the roughness significantly affects their performance. This also applies to the impellers turbopump units (TNA) of liquid rocket engines (LRE), the cast of superalloys, because this figure significantly affects the volumetric flow of the fuel components. However, due to the difficulties of conducting full-scale experiment on LRE, in that article the data from the cast steel ship propellers (SP) were used. There is a certain similarity between geometries of SP and functions of TNA. The similarity of the features and technologies of their production, both of which, firstly, produce a casting: impellers TNA - investment casting process, SP - casting in sand-clay molds, secondly, there is the similarity in the materials of the molds - in both cases, their basis is the sand, and the second component is a liquid binder. At the same time when molding in sand-clay parts often affects the penetration, firmly linked with the body of the casting crust, formed as a result of penetration of liquid metal into the pores between the grains of sand form, which is subsequently removed in a variety of ways, usually with the deterioration of surface cleanliness. To reduce metal penetration work surfaces forms are coated with fireproof paint, representing a suspension of the powder filler (graphite, powdered quartz, etc.). However, the use of such paints does not prevent the formation in castings of metal penetration due to the particle size of the fillers. In this paper a nonstick paint containing nanopowders of refractory chemical compounds is used, the use of such coatings is almost completely prevents the formation of burnt-on steel castings, including the one described in the work of the ship propeller, and, as a result, increased clarity and improved surface quality. The obtained results can be used in the manufacture of molds for the casting of the impellers TNA.
РИНЦ
Держатели документа:
Институт вычислительного моделирования СО РАН
Доп.точки доступа:
Крушенко, Генрих Гаврилович; Krushenko G.G.
Перевод заглавия: INCREASE OF THE PURITY OF METAL PRODUCTS SURFACES WITH APPLICATION OF NANOTECHNOLOGIES
| УДК |
Кл.слова (ненормированные):
турбонасосный агрегат -- рабочие колеса -- шероховатость -- нанопорошки -- turbopomp assembly -- work wheels -- surface roughness -- nanopowders
Аннотация: Известно, что качество поверхности металлоизделий механизмов и машин, оцениваемое по величине шероховатости, существенно влияет на их эксплуатационные характеристики. Это касается и рабочих колес (РК) турбонасосных агрегатов (ТНА) жидкостных ракетных двигателей (ЖРД), отливаемых из жаропрочных сплавов, так как этот показатель существенно влияет на объемную подачу компонентов топлива. Однако в связи с трудностями проведения натурного эксперимента на ЖРД в работе были использованы данные, полученные на судовом гребном винте (ГВ), отливаемом из стали, между геометрий которого и функциями РК ТНА имеется определенное сходство. Сходство имеется и в технологиях их изготовления. И те, и другие, во-первых, изготавливают литьем: РК ТНА - способом литья по выплавляемым моделям, ГВ - литьем в песчано-глинистые формы; во-вторых, имеется и сходство в материалах литейных форм: в обоих случаях их основой является песок, а вторым компонентом - жидкое связующее. При этом при литье в песчано-глинистые формы детали зачастую поражаются пригаром - прочно сцепленной с телом отливки коркой, образующейся в результате проникновения жидкого металла в поры между зернами песка формы, которую впоследствии удаляют разными способами, как правило, с ухудшением чистоты поверхности. С целью уменьшения пригара рабочие поверхности форм покрывают огнеупорными красками, представляющими собой суспензии из порошкового наполнителя (графит, пылевидный кварц и др.). Однако применение таких красок не предупреждает образование на отливках пригара из-за крупности частиц наполнителей. В работе использованы противопригарные краски, содержащие нанопорошки тугоплавких химических соединений. При использовании таких покрытий практически полностью предотвращается образование пригара на стальных отливках, включая и описанный в работе судовой гребной винт, и, как результат, повышается чистота и улучшается качество поверхности. Полученные результаты можно использовать при изготовлении форм при литье по выплавляемым моделям РК ТНА.
It is known that the quality of the surface of metal products machinery and equipment measured at the value of the roughness significantly affects their performance. This also applies to the impellers turbopump units (TNA) of liquid rocket engines (LRE), the cast of superalloys, because this figure significantly affects the volumetric flow of the fuel components. However, due to the difficulties of conducting full-scale experiment on LRE, in that article the data from the cast steel ship propellers (SP) were used. There is a certain similarity between geometries of SP and functions of TNA. The similarity of the features and technologies of their production, both of which, firstly, produce a casting: impellers TNA - investment casting process, SP - casting in sand-clay molds, secondly, there is the similarity in the materials of the molds - in both cases, their basis is the sand, and the second component is a liquid binder. At the same time when molding in sand-clay parts often affects the penetration, firmly linked with the body of the casting crust, formed as a result of penetration of liquid metal into the pores between the grains of sand form, which is subsequently removed in a variety of ways, usually with the deterioration of surface cleanliness. To reduce metal penetration work surfaces forms are coated with fireproof paint, representing a suspension of the powder filler (graphite, powdered quartz, etc.). However, the use of such paints does not prevent the formation in castings of metal penetration due to the particle size of the fillers. In this paper a nonstick paint containing nanopowders of refractory chemical compounds is used, the use of such coatings is almost completely prevents the formation of burnt-on steel castings, including the one described in the work of the ship propeller, and, as a result, increased clarity and improved surface quality. The obtained results can be used in the manufacture of molds for the casting of the impellers TNA.
РИНЦ
Держатели документа:
Институт вычислительного моделирования СО РАН
Доп.точки доступа:
Крушенко, Генрих Гаврилович; Krushenko G.G.