bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal transmittance and thermo-magnetization of unsteady free convection viscous fluid through non-singular differentiations
Authors: Abro Kashif Ali , Memon Imran Qasim , Siyal Ambreen 
Published: November 2020

Abstract
Convective stability of ferromagnetic fluids can provide an adequate heat transfer via conventional convection due to a temperature gradient. This manuscript presents an analytical study for thermo-magnetized convection by means of non-integer order derivatives is investigated in which the core object is to show how to enhance, invert and suppress the convection modes based on local verses non-local kernels. Mathematical modeling is developed for the sake of magnetization depends upon governing equations of velocity, concentration and temperature profiles. Fractional treatments are invoked based on Fourier analysis and Laplace transforms to the dynamical equations govern the thermomagnetic convection. The analytical solutions of velocity, concentration and temperature have been established in terms of Mittage-Leffler

E

α

−
β

t

α

and elementary functions. In order to have the performance of higher or lower susceptibility from thermomagnetic convection, profiles of velocity, concentration and temperature have been depicted separately by means of Atangana-Baleanu and Caputo-Fabrizio fractional operators for highlighting the immense impacts on ferromagnetic fluid flow. For the sake of novel outcomes of this study, it is observed that velocity is decreasing function of magnetic field when an increment in the amount of magnetic constant kicks off the augmentation of the Lorentz strength.
Exergy analysis of dual-fuel combined cycle plants
Authors: Borush O V , Shchinnikov P A , Frantseva A A , Grigoryeva O K 
Published: November 2020

Abstract
An alternative to coal technology in regions with a significant share of gas in the fuel balance can be the transition to dual-fuel combined cycle gas turbine plants. The article considers five technological profiles of cogeneration combined cycle gas turbine power unit: with a low-pressure steam generator; with coal gasification; with gas line heater; with gas line heater and freon thermotransformer; dump type with a binary coefficient equal to one. A comprehensive analysis of cogeneration plants was carried out. The perfection of the thermal design of a combined cycle gas turbine power unit of each type is evaluated by the exergy structural coefficient. An analysis the criterion of technical and economic efficiency, exergy efficiency for the supply of electricity and thermal power for combined cycle power plants in comparison with traditional cogeneration power units in the power range of 50 … 250 MW are also given.
Investigations of the influence of tungsten carbide and tungsten oxide nanopowders on the radiation protection properties of cement matrix-based composite materials
Authors: Gavrish V , Cherkashina N , Chayka T 
Published: November 2020

Abstract
The influence of tungsten carbide and tungsten oxide nanopowders on radiation-protective properties of a composite material based on a cement matrix has been studied. These powders are obtained from carbide scrap production. In the radiation energy range of 0.06…1.408 MeV the gamma radiation attenuation coefficients at various concentrations of nanopowders WC and WO3 (3.6%, 6.4%, 9.6% of the material mass) have been considered. The mass attenuation coefficient and the multiple of attenuation of radiation of investigated materials are calculated. It is shown that nanomodified composite material has high radiation protection characteristics and can find wide application as a radio protection material.
Improvement of the frequency converter’s equivalent circuit when calculating non-sinusoidal modes
Authors: Belsky A A , Dobush V S , Zamyatin A I 
Published: November 2020

Abstract
The issues related to modeling a variable frequency drive are discussed in the article. The authors were faced with the task of determining the influence of the drive load on the parameters of its equivalent circuit. An unambiguous dependence of the drive load on the value of the current’s harmonic components is revealed. Namely, the smaller the load, the greater the value of the current’s higher harmonics. It has been established that disregarding drive loading can lead to a 19% error in modeling the frequency converter current consumption. It is shown that the results of the study can be extended to a wide range of drives in terms of power, since all calculations were performed in relative units.
The synergistic effect of the thickened digestate treatment in the vortex layer apparatus prior to its recirculation into the reactor on the characteristics of anaerobic bioconversion of organic waste
Authors: Kovalev Andrey A , Kovalev Dmitriy A , Litti Yuriy V , Katraeva Inna V 
Published: November 2020

Abstract
For the first time, the effect of thickened digestate treatment in a vortex layer apparatus (VLA) prior to its recirculation into anaerobic reactor on the efficiency of anaerobic bioconversion of an organic substrate was investigated. At the hydraulic retention time of the recirculated digestate in VLA for 30 seconds, of the substrate in the anaerobic bioreactor for 8 days and the recirculation coefficient of 1.5, the average specific yield of biogas increased by 75.2%, and the average volumetric methane production – by 16.8%. There was no increase in methane concentration in biogas, while the average concentration of hydrogen sulfide in biogas decreased by 8 times.
Impact effects due to hot vapour bubble collapse in subcooled liquid
Authors: Le T C , Melikhov V I , Melikhov O I , Yakush S E 
Published: November 2020

Abstract
Collapse of a hot vapour bubble captured by subcooled water can produce a cumulative jet similar to that appearing in cavitating flows. In the context of stratified steam explosions following spreading of hot melt under a water layer, impact of the water jets can be a reason for melt splashes promoting the mixing of cold and hot liquids necessary for energetic interaction. In this work, the characteristics of the directional water flow caused by collapse of a bubble near a wall are obtained, and a correlation is given which relates the ultimate height of melt rise to the bubble parameters and droplet size. Estimates relevant to melt splashes caused by the cumulative water jet impact are presented which agree with the experimental observations available in the literature.
Determination of the main parameters of the process of boric acid droplet entrainment from the WWER reactor in case of an accident
Authors: Morozov A V , Shlepkin A S , Sakhipgareev A R , Soshkina A S 
Published: November 2020

Abstract
The article presents the results of a calculation study of the process of mass transfer of boric acid from a WWER reactor in the event of an accident. An analysis of the literature data in this field of study was carried out. As a result, it was found that studies of the mass transfer of boric acid were performed with parameters not typical for the emergency operation of passive safety systems of nuclear power plants with WWER. The results of the calculation of the main parameters in the WWER reactor in the event of an accident with a rupture of the main circulation circuit are shown. The calculation analysis allowed us to determine that the maximum diameter of the droplets entrained by the steam is in the range 0.11-0.23 mm.
Mathematical modelling and improvement of ion exchange water treatment energy-saving technologies in power engineering
Authors: Chichirov A A , Chichirova N D , Filimonova A A , Babikov O E 
Published: November 2020

Abstract
A mathematical model of the ion-exchange filter regeneration process of a wastewater treatment plant is presented in this paper. In the model the ionite filter is considered as a chemical through-passage reactor with bulk material, final length, periodical action in a stationary mode. The one-parameter diffusion model used for the description with the Dankwerts boundary conditions makes it possible to calculate with sufficient accuracy the output concentration curves of the reagent and products.
Use of photovoltaic converters in electrochemical protection systems for underground pipelines
Authors: Artyukhov D I , Stepanov S F , Artyukhov I I , Miroedov F P 
Published: November 2020

Abstract
Currently, electrochemical protection of pipelines is provided by cathodic protection stations, which receive electric energy from power lines laid along the pipeline route. The construction and installation of facilities that ensure the transmission of electricity from centralized sources to locations of cathodic protection stations and the conversion of its parameters to the required level is characterized by significant capital costs. In recent years, there has been a leap forward in the development of alternative energy sources, which allows us to consider them as sources for power supply of cathodic protection stations. This paper describes the possibility of using photovoltaic converters to power cathodic protection stations. In addition, an implementation scheme was proposed and analyzed.
Development of methodological provisions for reducing the resource and energy intensity of cylindrical two-stage natural gas filters
Authors: Usachev A P , Shurayts A L , Biryukov A V , Salin D V 
Published: November 2020

Abstract
The article presents the development of methodological provisions for reducing the resource and energy intensity of cylindrical two-stage natural gas filters. In order to reduce consumption in filtering cylindrical elements and vertical barriers used for their dismantling, we proposed a layout plan for several short filtering cylindrical elements, located one on top of the other, instead of one existing analogue, i.e. a one-piece unit. At that, the height of the dismountable unit does not exceed the height of the standard structure. According to the proposed technique, we carried out calculations, the results of which show that minimum consumption in cylindrical two-stage filters is achieved when the number of filtering cylindrical elements located one on top of the other is doubled if compared with the existing analogue.
Simulation modelling of autonomous navigation support for small satellite constellation
Authors: Drozd O V , Tutatchikov V S , Kapulin D V 
Published: November 2020

Abstract
A small satellite system has many advantages related to its technical characteristics, production cycle and costs. At the same time, separate satellites are usually operating as a part of a ballistic-coupled constellation. The navigation and ballistic support tasks for the satellite group include calculation of satellite motion, of inter-satellite bases and prediction of the ballistic existence of the constellation. Currently, autonomous navigation support of the constellation is proved by onboard satellite navigation systems, the design cycle of which necessarily includes simulation of implemented algorithms. In the paper, the simulation model of small satellite navigation support is presented. The simulation procedure for the navigation support includes the following steps: formation the reference satellite constellation, estimation the current status of GPS and GLONASS systems orbital groupings, calculation the parameters of navigational satellite radio-visibility, solving the navigation problem according to global navigation satellite systems and inter-satellite navigation. The article also describes the procedure and results of modelling the process of the onboard navigation system functioning. Further development of the model associated with the software implementation of the small satellite disturbed orbital motion and modules for generating the radio frequency component of navigation and inter-satellite signals.
Development of a device for monitoring and tuning radio-technical parameters of a satellite communications Earth station
Authors: Gladyshev A B , Dmitriev D D , Tyapkin V N , Ratuschnyak V N 
Published: November 2020

Abstract
The article describes the existing methods for studying the characteristics of the antennas that are used in satellite earth stations. A variant of the device based on a spherical scanner is proposed. The spherical scanner uses the method of measuring the field in the near field. It has been established that for high efficiency and reduction of measurement time, it is necessary to use the spiral scanning method. The composition and block diagram of the device is presented. Recommendations on the use of software for processing measurement results are given.
Intellectual analysis of geological and technological data during the management of an oil field’s well-stock
Authors: Evsyutkin I V , Markov N G 
Published: November 2020

Abstract
The drilling and putting into operation of new wells on the operated well-stocks are labor-intensive and expensive business processes. Therefore the actual direction at the operation of such well-stocks is the development of new methods and the implementing them tools of effective well-stock management of already existing wells that allow lowering costs at the production of hydrocarbon material (HM). In this regard, today the optimum management decision-making is impossible any more without the use of perspective methods and algorithms of the intellectual analysis of geological and technological data. Results of the analysis of a current state in the field of intellectual methods and algorithms in relation to problems of well-stocks management at the production of HM on oil fields are given in the article. Results of the efficiency research of cluster analysis methods and the deep artificial neural networks (deep ANN or DANN) at the solution of one of the main tasks of well-stock management are received and analyzed; the task is a candidates-wells selection for carrying out geological and technical arrangements on the well-stock.
Methods of modeling and probabilistic analysis of large deviations of dynamic systems
Authors: Kabanov A A , Dubovik S A 
Published: November 2020

Abstract
The paper presents a new method of analyzing large deviations for nonlinear systems defined through matrices with state-dependent coefficients. Large deviations of the controlled process from some standard state is the basis to forecast any critical situation. The task of forecasting is limited to the optimal control problem of Lagrange-Pontryagin optimal control. Two effective methods – State-Dependent Riccati Equations (SDRE) and approximated sequence of Riccati equations (ASRE) – are used. The presented approach to the Lagrange-Pontryagin problem differs from the approach previously used for linear cases by the fact that it uses control in the form of a feedback instead of software open-loop control. This eliminates the need to calculate the end-time boundary value for a conjugate variable, which is the most time-consuming task in nonlinear cases.
Comparative analysis of libraries for computer vision OpenCV and AForge.NET for use in gesture recognition system
Authors: Kiselev I V 
Published: November 2020

Abstract
The article presents the results of the experiment, which based on a comparative analysis of two libraries for solving problems in the field of computer vision in intelligent gesture recognition system: OpenCV and AForge.NET. For the test was developed by intelligent gesture recognition system at both libraries and a block diagram of the gesture recognition system has been developed. A recognition algorithm based on neural network technologies has been developed, suitable sample descriptors and classifier structure have been selected to achieve the best results.The effectiveness of the gesture recognition test software was also evaluated. Below is a brief description of both libraries, a more detailed description of the research and test results.
Media content monetization model on the example of micropayments
Authors: Kukartsev A V , Lobkov K Yu , Tynchenko S V , Boyko A A , Stupina A A , Eremeev D V 
Published: November 2020

Abstract
The article provides a variant of the site content monetization model. It indicates the mechanism for the passage of micropayments. A presented simulation model is necessary for assessing the convergence of the unit economy where a user is a UNIT (web content consumer). A mechanism for selecting metrics that affect the margin value is applied. As a result of experiments with versions, various alternatives of the projected income were obtained without taking into account fixed costs (income from a paying user for different conversion values) and a variant of unit-economy convergence was found. The study made it clear that the constructed simulation model provides a visual opportunity to work with metrics, to obtain and compare the results of unit-economy calculations. Moreover, unit economics, as an analytic method, is becoming popular for presenting information to investors and effective for digital projects. It showed the prospects of this area at the project planning stage.
Mathematical modelling of transport of single and double charged ions through layered ion exchange membranes
Authors: Mareev AA , Kirichenko E V , Kirichenko K A 
Published: November 2020

Abstract
Monovalent selectivity of ion exchange membranes is important for such areas as hardness removal, stabilization of mining waters and fining of foods. The modern approach to the creation of monovalent selective ion exchange membranes is layer-by-layer adsorption of polyelectrolytes onto a membrane surface, which showed significant improvement in comparison with previously used approaches, most notably in comparison with the creation of a single thick layer of polyelectrolyte. Despite the practical importance, the mechanism of improvement in selectivity is unknown. Knowledge of the distribution of ions within the membrane and adjacent layers of solution would answer the question of the mechanism, but such information is unobtainable through the experiment. Hence we develop the 1D mathematical model based on Nernst-Planck-Poisson equations to describe the fluxes and the concentrations of single and double charged ions, as well as potential drop / current density through the ion exchange membrane. In this paper we formulate the problem and list experimentally determined parameters. Results of calculations will be compared with experimentally recorded I-V and V-t curves.
Network marks of montage in audio recordings
Authors: Portnyagin D G , Kravchuk E I , Trufanov A I , Ivanov A S , Berestneva O G , Tikhomirov A A 
Published: November 2020

Abstract
Very often forensic domain processes required an approval of authenticity in audio recordings presented as admissible evidence. Standard techniques to search for editing in audio materials are rather long and wearisome. The paper proposes a network platform as an effective instrument for solving the above mentioned problem. A specialized software tool was developed to transform given audio data into set of nodes and links according to the algorithms of natural visibility graph and horizontal visibility. A comparative analysis of the derived network structures was performed with the use of popular Gephi software product. The results demonstrate the first advances of network paradigm for detection of audio montage, in addition the examples of trivial signals of those point on possible existence of a marker - the metric that responds to sound recordings tampering.
Modeling a stressed-deformed state of a technological apparatus
Authors: Rubtsov A V , Kulakov P A , Mukhametzyanov Z R , Bayazitov M I , Arkhipova K S , Gimaltdinov I K 
Published: November 2020

Abstract
The operation of devices with a shirt is carried out at high pressures and temperatures in corrosive environments. This is a prerequisite for the development of such a damage mechanism as a decrease in wall thickness and loss of strength. For a quantitative assessment of the degree of corrosion wear and prediction of the further period of safe operation of the apparatus, standard methods and techniques are used, which are indicated in the current regulatory and technical documentation for diagnosing and evaluating the resource. For apparatuses with a shirt, access to a complete 100% inspection of the inner surface of both the main apparatus and the shirt is difficult due to the design features and the absence of a hatch of sufficient diameter. In this regard, a large error in the qualitative assessment of the technical condition and resource forecasting is possible. Currently relevant is the work on modeling apparatuses and assessing the stress-deformed state, taking into account their design and operational features, taking into account changes in the parameters of the technical condition, such as corrosion wear, and identifying the most loaded zones and areas with a view to their furthermore detailed diagnosis. In this paper, we study the interconnection between the effects of operational loads and corrosion wear, both of the apparatus itself and the shirt on the stress-deformed state of the apparatus as a whole.
Development of a mathematical model of a transformer-type corrosion meter for pipelines
Authors: Tyncherov K T , Bazhenov A V , Lipilina E Yu , Olenev A A , Selivanova M V 
Published: November 2020

Abstract
The article is devoted to the substantiation of a technical solution to the problem of monitoring corrosion changes in the walls of oil and gas pipelines using the electromagnetic method of non-destructive testing. To conduct a machine experiment on the qualitative and quantitative assessment of the characteristics of the magnetic field of solenoids with different geometric characteristics, a model has been developed that allows determining the magnetic induction and vector potential of the magnetic field of the solenoid and to visualize individual projections of vectors. The dependence of the vector magnetic potential of the field induced in the transformer and the role of the magnetic circuit in which the control object performs on the geometric and electromagnetic properties of the control object is determined.
Quality analysis of digital photogrammetric models obtained in low light conditions
Authors: Vystrchil M G , Sukhov A K , Novozhenin S U , Popov A V , Guba S A 
Published: November 2020

Abstract
The paper presents the results of the study of the photogrammetric models quality depending on the photogrammetric survey. The presented data have been obtained by the Xiaomi Mi Home Security Camera 360. We examined the texture of the captured object and the general geometric parameters of the created photographing basis as the experimental variable. As a result, the paper contains general recommendations for the cameras optimal location for photogrammetric surveying in low light and space limits. The main author’s idea of the improvement of the photogrammetric models quality is projecting a temporary artificial texture on the subject of surveying.
Simulation modelling in design of a city transit vehicle with electromagnetic suspension
Authors: Yaroslavtsev M V , Latyshev R N , Zemlyakov E A 
Published: November 2020

Abstract
Intensive development of city transit vehicles with electromagnetic suspension of the last decade raises the significance of their optimal design problems. In this paper, the simulation model of an electromagnetic suspension system of the city transit vehicle created in Simulink is presented. The model is featuring feedback applied to determine the magnitude of the magnetic flux. The main parameters of the electromagnet were evaluated while creating the model. The presented model was used to obtain the air gap regulator settings. An adaptive control system ensuring low energy consumption at low speed and high gap control accuracy at high speed could lead to the realization of the stable and efficient suspension system.