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  • 2020-2024  (2,767)
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  • 1
    Online Resource
    Online Resource
    Figure 5 from: Zrodnikov AV, Korobeynikov VV, Moseev AL, Egorov AF (2020) Multi-criteria analysis of the efficiency of scenarios for the development of the Russian nuclear industry in view of the uncertain prospects for the future. Nuclear Energy and Technology 6(4): 299-305. https://doi.org/10.3897/nucet.6.60557
    Pensoft Publishers ; 2020
    In:  Nuclear Energy and Technology Vol. 6, No. 4 ( 2020-11-20), p. 299-305
    Details
    In: Nuclear Energy and Technology, Pensoft Publishers, Vol. 6, No. 4 ( 2020-11-20), p. 299-305
    Abstract: Multi-criteria analysis is used in many areas of research where it is required to compare several alternatives according to a selected set of criteria. Of particular interest is the application of this method for a comparative assessment of the efficiency of scenarios for the development of innovative nuclear systems. The article proposes an approach to the computational substantiation of the step-by-step transfer of the Russian nuclear industry to a two-component nuclear energy system (NES) with a centralized closed nuclear fuel cycle (NFC) based on the multi-criteria analysis method. At the same time, consideration is given to options for the development of the domestic nuclear industry in view of the uncertain prospects for the future. Taking into account various trends in the nuclear energy development, the authors identify the following three groups of possible scenarios. The first group includes ‘growing’ scenarios in which the number of units and their total installed capacity grow over time. The second group assumes that after a certain time of growth of the installed capacities, the stationary level will be reached, in which there will be no time-dependent capacity changes. The third group simulates a decrease in the installed nuclear energy capacities in the country after some growth. To select the most preferable ways of technological development and assess the efficiency of a nuclear energy system, a limited set of selection criteria and performance indicators are used, covering the economy, export potential, competitiveness, efficient SNF and RW management, natural uranium consumption, and innovative development potential. An important part of this work was a detailed analysis of the uncertainties in the weights and input data used to derive the criteria.
    Type of Medium: Online Resource
    ISSN: 2452-3038
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3897/nucet.6.60557
    DOI: 10.3897/nucet.6.60557.figure1
    DOI: 10.3897/nucet.6.60557.figure3
    DOI: 10.3897/nucet.6.60557.figure2
    DOI: 10.3897/nucet.6.60557.figure4
    DOI: 10.3897/nucet.6.60557.figure5
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2020
    detail.hit.zdb_id: 2858592-6
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  • 2
    Online Resource
    Online Resource
    Figure 3 from: Egorov L, Ruchin A, Esin M, Artaev O (2022) Biodiversity of Coleoptera (Insecta) in Mordovia State Nature Reserve (Russia) using fermental traps. Biodiversity Data Journal 10: e96989. https://doi.org/10.3897/BDJ.10.e96989
    Pensoft Publishers ; 2022
    In:  Biodiversity Data Journal Vol. 10 ( 2022-12-19)
    Details
    In: Biodiversity Data Journal, Pensoft Publishers, Vol. 10 ( 2022-12-19)
    Abstract: Protected areas are unique ecosystems that are minimally affected by anthropogenic activities. Therefore, in many cases, they are refugia and relevance of faunistic research is undeniable here. A simple method of catching insects, such as trapping with the help of fermental traps, was used in this area for the first time. The authors of the dataset used this method from 2018 to 2021. One thousand and fifty-one traps of our own design were installed. The dataset includes data on 367 species from 52 families (6,497 records of 44,600 specimens). Ten species were dominant in the traps ( Cryptarcha strigata , Protaetia marmorata , Glischrochilus grandis , Glischrochilus hortensis , Soronia grisea , Rhagium mordax , Leptura thoracica , Leptura quadrifasciata , Quedius dilatatus and Protaetia fieberi ). These species accounted for 76.9% of all individuals in the total amount of captured specimens. Cryptarcha strigata was the most numerous species (28.8% of the total) and the most frequently encountered species (64.9%). The greatest species diversity was recorded in the families Cerambycidae (53 species), Elateridae and Curculionidae (39 species each), Nitidulidae and Coccinellidae (22 species each). The dataset contains information on the occurrence of 15 rare species. We have recently published a checklist of the Coleoptera of Mordovia State Nature Reserve (Egorov et al. 2020). It included 2,145 species from 88 families. However, the published list did not contain information about the occurrence of various species of beetles, especially caught in recent years. Part of this list contained information about species collected using fermental traps. However, the list of species did not provide information about specific locations.
    Type of Medium: Online Resource
    ISSN: 1314-2828 , 1314-2836
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3897/BDJ.10.e96989
    DOI: 10.3897/BDJ.10.e96989.figure1
    DOI: 10.3897/BDJ.10.e96989.figure2
    DOI: 10.3897/BDJ.10.e96989.figure3
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2022
    detail.hit.zdb_id: 2736709-5
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  • 3
    Online Resource
    Online Resource
    NUMERICAL STUDY OF DYNAMICS IN-CHAMBER PROCESSES IN MULTI-NOZZLE SOLID ROCKET MOTORS. PART 1. CALCULATION METHOD
    PNRPU Publishing House ; 2023
    In:  Perm National Research Polytechnic University Aerospace Engineering Bulletin , No. 72 ( 2023), p. 59-74
    Details
    In: Perm National Research Polytechnic University Aerospace Engineering Bulletin, PNRPU Publishing House, , No. 72 ( 2023), p. 59-74
    Abstract: The dynamics of transient in-chamber processes of booster (overclocking) multi-hop of solid rocket motor is investigated. The research method is the formulation of a computational experiment. The conjugate formulation of the problem is considered, which includes: – the ignition device is triggered (the combustion rate of the igniting composition is described on the basis of an experimental and theoretical approach that takes into account the burning of combustion products behind the body of the igniting device); – heating, ignition and subsequent unsteady and turbulent combustion of a charge of a mixed solid fuel (a quasihomogeneous combustion model is used, formulated on the basis of the equations of thermal conductivity and chemical kinetics recorded for the condensed phase (solid fuel), taking into account the influence of the gas phase (flare) on the combustion process in the condensed phase; the method of solving the problem is the finite difference method); – unsteady three-dimensional homogeneous-heterogeneous three-phase flow of nitrogen (pre-pressurization gas of the combustion chamber) and combustion products of the igniting composition and mixed solid fuel in the combustion chamber, multi-core block and behind the multi-core block of the rocket engine (approaches of mechanics of continuous multiphase media are used; the basic system of equations is a system of vortex differential equations of gas dynamics; the solution method is multiparametric a class of difference splitting schemes by physical processes of the Davydov method); – depressurization of the combustion chamber and the departure of the plugs of the multi-nozzle block of solid rocket motor (the equation of motion of the nozzle block plug is Newton's second law; the method of solving the problem is the Euler method). Each of the subtasks is considered in relation and resolved simultaneously – at one-time step. To solve the formulated problem, a set of application programs has been developed using (for the main calculation module) the OpenCL multithreading information processing standard. The operability of the software product was checked.
    Type of Medium: Online Resource
    ISSN: 2224-9982
    Uniform Title: ЧИСЛЕННОЕ ИССЛЕДОВАНИЕ ДИНАМИКИ ВНУТРИКАМЕРНЫХ ПРОЦЕССОВ В МНОГОСОПЛОВОМ РАКЕТНОМ ДВИГАТЕЛЕ НА ТВЕРДОМ ТОПЛИВЕ ЧАСТЬ 1. МЕТОДИКА РАСЧЁТА
    URL: Journal
    URL: Article
    DOI: 10.15593/2224-9982
    DOI: 10.15593/2224-9982/2023.72.05
    Language: Unknown
    Publisher: PNRPU Publishing House
    Publication Date: 2023
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  • 4
    Online Resource
    Online Resource
    Anomalous Features of Dynamics of Intrachamber Processes in a Low-Thrust Solid Propellant Rocket Engine with a Multi-Grain Propellant Charge
    Allerton Press ; 2021
    In:  Russian Aeronautics Vol. 64, No. 4 ( 2021-10), p. 711-720
    Details
    In: Russian Aeronautics, Allerton Press, Vol. 64, No. 4 ( 2021-10), p. 711-720
    Type of Medium: Online Resource
    ISSN: 1068-7998 , 1934-7901
    URL: Article
    DOI: 10.3103/S1068799821040164
    Language: English
    Publisher: Allerton Press
    Publication Date: 2021
    detail.hit.zdb_id: 2322785-0
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  • 5
    Online Resource
    Online Resource
    Figure 2 from: Nguyen CH, Nguyen LV, Nguyen KS, Egorov AA, Averyanov LV (2021) Hemiboea chanii (Gesneriaceae), a new species from limestone areas of northern Vietnam. PhytoKeys 183: 108-114. https://doi.org/10.3897/phytokeys.183.69180
    Pensoft Publishers ; 2021
    In:  PhytoKeys Vol. 183 ( 2021-10-22), p. 108-114
    Details
    In: PhytoKeys, Pensoft Publishers, Vol. 183 ( 2021-10-22), p. 108-114
    Abstract: Hemiboea chanii , a new species of Gesneriaceae from Ha Giang Province, northern Vietnam, is here described and illustrated. It has many branched stems, diamond-shaped involucre with two cirrose opposite apices, a pink corolla, red spotted inside, and a flowering time in January-February. Among congeners with an externally hairy corolla, this new species is morphologically close to H. crystallina and H. sinovietnamica . Diagnostic discriminative characters in all mentioned species are discussed. The conservation status of this species is considered to be “Critically endangered” (CR) according to the IUCN Red List Categories and Criteria.
    Type of Medium: Online Resource
    ISSN: 1314-2003 , 1314-2011
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3897/phytokeys.183.69180
    DOI: 10.3897/phytokeys.183.69180.figure1
    DOI: 10.3897/phytokeys.183.69180.figure2
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2021
    detail.hit.zdb_id: 2579891-1
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  • 6
    Online Resource
    Online Resource
    NUMERICAL STUDY OF DYNAMICS INTRACHAMBER PROCESSES IN SOLID PROPELLANT SUSTAINER TAKING INTO ACCOUNT FLIGHT OVERLOADS. PART 1. CALCULATION METHOD
    PNRPU Publishing House ; 2021
    In:  Perm National Research Polytechnic University Aerospace Engineering Bulletin , No. 64 ( 2021), p. 91-103
    Details
    In: Perm National Research Polytechnic University Aerospace Engineering Bulletin, PNRPU Publishing House, , No. 64 ( 2021), p. 91-103
    Abstract: The dynamics of transient in-chamber processes (internal ballistics) of the cruise missile's second-stage cruise missile propulsion system is studied, taking into account, in the general case, distributed spatially-three-dimensional and time-varying flight overloads. The research method is the formulation of a computational experiment. Be considered coupled formulation of the problem, including: – transient triggering of igniter device (the rate of combustion of the igniting composition is described on the basis of experimental and theoretical approach afterburn combustion products in case igniting device); preheating, ignition and subsequent unsteady and turbulent combustion of solid propellant charge (used quasi-homogeneous combustion model based on the equations of heat conduction and chemical kinetics recorded for a condensed phase (solid fuel), taking into account the influence of the gas phase (torch) on the process of combustion in the condensed phase; the method of solving the problem – finite difference method); – non-stationary three-dimensional homogeneous-heterogeneous four phase flow of air and products of combustion in the combustion chamber, the nozzle block and the block launchers rocket engine (used approaches of continuum mechanics of multiphase media; the basic system of equations system of vortex differential equations of gas dynamics solution method – a multi-parameter class of difference schemes of splitting into physical processes of the method Davydova); – depressurization of the combustion chamber of the SRB (equation of motion of the plug nozzle block – Newton's second law; the proposed solution method – Euler's method). Each of the subtasks is considered in a relationship and resolved simultaneously – at one time step. To solve the formulated problem, a set of application programs has been developed using (for the main calculation module) the OpenCL multithreaded information processing standard. The performance of the software product was checked.
    Type of Medium: Online Resource
    Uniform Title: ЧИСЛЕННОЕ ИССЛЕДОВАНИЕ ДИНАМИКИ ВНУТРИКАМЕРНЫХ ПРОЦЕССОВ В МАРШЕВОМ РАКЕТНОМ ДВИГАТЕЛЕ НА ТВЕРДОМ ТОПЛИВЕ С УЧЕТОМ ПОЛЕТНЫХ ПЕРЕГРУЗОК. ЧАСТЬ 1. МЕТОДИКА РАСЧЕТА
    URL: Journal
    URL: Article
    DOI: 10.15593/2224-9982
    DOI: 10.15593/2224-9982/2021.64.10
    Language: Unknown
    Publisher: PNRPU Publishing House
    Publication Date: 2021
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  • 7
    Online Resource
    Online Resource
    NUMERICAL STUDY OF THE DYNAMICS OF INTRA-CHAMBER PROCESSES IN A ROCKET ENGINE FOR MOBILE COMPLEXES WITH A MULTI-TURRET POWDER CHARGE
    PNRPU Publishing House ; 2020
    In:  Perm National Research Polytechnic University Aerospace Engineering Bulletin , No. 60 ( 2020), p. 55-63
    Details
    In: Perm National Research Polytechnic University Aerospace Engineering Bulletin, PNRPU Publishing House, , No. 60 ( 2020), p. 55-63
    Abstract: A solid-fuel rocket engine is a complex technical system in which a number of interrelated non – stationary and substantially nonlinear physical and chemical processes simultaneously occur. The type of SFRE under consideration has its own problems and design features. To optimize the parameters of a rocket engine, we study the dynamics of its internal processes. The research method is to set up a computational experiment. We consider the conjugate statement of the problem, which includes: triggering of the ignition device; – heating, ignition and subsequent unsteady and turbulent combustion of the powder charge; – unsteady threedimensional shock wave and a vortex of homogeneous-heterogeneous flow of air and products of combustion in the combustion chamber, nozzle block and launchers unit; – depressurization of the combustion chamber and the subsequent departure of the stub nozzle block. Each of the subtasks is considered in a relationship and resolved simultaneously - at a single time step. As a result of researches it is established that when triggered, the solid-propellant in the combustion chamber is implemented by an abnormal process associated with the segregation of the combustion mode of multi-turret powder charge. The results of numerical calculations are presented, on the basis of which constructive measures are developed to eliminate this undesirable effect.
    Type of Medium: Online Resource
    ISSN: 2224-9982
    Uniform Title: ЧИСЛЕННОЕ ИССЛЕДОВАНИЕ ДИНАМИКИ ВНУТРИКАМЕРНЫХ ПРОЦЕССОВ В РАКЕТНОМ ДВИГАТЕЛЕ ДЛЯ МОБИЛЬНЫХ КОМПЛЕКСОВ С МНОГОШАШЕЧНЫМ ПОРОХОВЫМ ЗАРЯДОМ
    URL: Journal
    URL: Article
    DOI: 10.15593/2224-9982
    DOI: 10.15593/2224-9982/2020.60.06
    Language: Unknown
    Publisher: PNRPU Publishing House
    Publication Date: 2020
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  • 8
    Online Resource
    Online Resource
    NUMERICAL STUDY OF DYNAMICS INTRACHAMBER PROCESSES IN SOLID PROPELLANT SUSTAINER TAKING INTO ACCOUNT FLIGHT OVERLOADS. PART 2. CALCULATION RESULTS
    PNRPU Publishing House ; 2021
    In:  Perm National Research Polytechnic University Aerospace Engineering Bulletin , No. 64 ( 2021), p. 104-112
    Details
    In: Perm National Research Polytechnic University Aerospace Engineering Bulletin, PNRPU Publishing House, , No. 64 ( 2021), p. 104-112
    Abstract: The article presents the results of numerical calculations of the dynamics of in-chamber processes in the cruise missile's second-stage cruise missile propulsion system, taking into account the distributed space-three-dimensional and time-varying flight overloads, obtained using the previously developed calculation method and the application software package created on its basis. The value of the flight overload of a cruise missile, in projections along the coordinate axes, is determined depending on the mass, speed and trajectory of the rocket, mass flow and thrust of the rocket engine. The external aerodynamic effect on the in-chamber process in the SRM is neglected. The results of the calculations are given in comparison-without taking into account and taking into account the effect of flight overload. Two main stages of the rocket engine operation are considered: entering the operating mode and the main operating mode. At the stage of entering the SRM operation mode, the overload affects the redistribution of the temperature of the gas phase of the combustion products in the area of the front bottom of the combustion chamber. On the March operation of the SRB as a result of the flight of an overload, an increase of the particle density (liquid drops) small and large diameter of the solid phase of the combustion products in the wall of the back plate and pre-exhaust gas flue, and the degree of change in the distribution density of the particles (liquid droplets) that are larger than large. The results of the numerical study are in good agreement with the experimental data – the results of bench tests of the rocket engine and the results of flight tests of the cruise missile, which includes the considered SRM.
    Type of Medium: Online Resource
    Uniform Title: ЧИСЛЕННОЕ ИССЛЕДОВАНИЕ ДИНАМИКИ ВНУТРИКАМЕРНЫХ ПРОЦЕССОВ В МАРШЕВОМ РАКЕТНОМ ДВИГАТЕЛЕ НА ТВЕРДОМ ТОПЛИВЕ С УЧЕТОМ ПОЛЕТНЫХ ПЕРЕГРУЗОК. ЧАСТЬ 2. РЕЗУЛЬТАТЫ РАСЧЕТА
    URL: Journal
    URL: Article
    DOI: 10.15593/2224-9982
    DOI: 10.15593/2224-9982/2021.64.11
    Language: Unknown
    Publisher: PNRPU Publishing House
    Publication Date: 2021
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  • 9
    Online Resource
    Online Resource
    Nondestructure diagnostics of surface layers elements content for cylindrical shape material objects
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1713, No. 1 ( 2020-12-01), p. 012015-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1713, No. 1 ( 2020-12-01), p. 012015-
    Abstract: The methodics background for the nondestructive element concentration diagnostics of cylindric shape material objects surface layer is developed. The diagnostics is produced without objects form-factor distortion on base of ion beams and X-ray analytical methods. The depth element concentration distribution determination found on the ion beams Rutherford backscattering data and results of X-ray fluorescence testing in conditions of TXRF modified measurements. Possibilities of the elaborated analytical conception are illustrated by experimental data obtained at study of element content in surface layer of the nuclear heat release cell shell.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1713/1/012015
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
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  • 10
    Online Resource
    Online Resource
    Computational and experimental study of longitudinal stability of the thin-walled flat bar structure
    Bauman Moscow State Technical University ; 2023
    In:  Engineering Journal: Science and Innovation , No. 3 (135) ( 2023-3)
    Details
    In: Engineering Journal: Science and Innovation, Bauman Moscow State Technical University, , No. 3 (135) ( 2023-3)
    Abstract: The paper studies longitudinal stability of the centrally compressed flexible flat bars using computational and experimental methods. Calculations were carried out according to the dynamic analysis methodology in the LS-DYNA software package. This methodology is based on three determining factors, i. e. volume, technological deviations and real-time mode. When constructing a hinged bar model, 3D finite elements, elastic-plastic material model, asymmetrical cuts of small volumes simulating geometric technological deviations were used. Critical forces determined by the methodology were compared with the Euler forces and with the experimental data. The experiment was carried out on bars with pointed ends, which were abutted against the angular technological equipment and provided with free rotation of the bar ends. As a result of the computational and experimental study of the flexible bars stability, it was established that in real bar designs there appeared initial shape imperfections noticeably affecting the critical forces magnitude, and the more flexible the bar was, the stronger this effect was. Quantitative relationship was also found between the experimentally measured critical forces and those calculated by the methodology and by the Euler formula. The issues of the origin of initial form imperfections in real bars were touched upon. Three possible directions for searching for a solution to the problem of bar stability using the methodology of dynamic analysis are shown depending on the method of introducing technological deviations into the structure calculation scheme. Diagrams of the hinged flat bars deformation during compression tests are provided.
    Type of Medium: Online Resource
    ISSN: 2308-6033
    Uniform Title: Расчетно-экспериментальное исследование продольной устойчивости конструкции тонкостенного плоского стержня
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.18698/2308-6033-2023-3
    DOI: 10.18698/2308-6033
    DOI: 10.18698/2308-6033-2023-3-2256
    Language: Russian
    Publisher: Bauman Moscow State Technical University
    Publication Date: 2023
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