bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fractional analysis of induced resonance effects in the spherical motion of a rigid body with flywheels
Authors: Lyubimov V V 
Published: November 2019

Abstract
The evolution of the motion of an asymmetric rigid body with flywheels can be explored by the methods of asymptotic analysis. It is shown, that the effect of small moments resulting from the displacement of the center of mass and of small control moments from the flywheels lead to the emergence of non-linear resonance evolutionary effects. The aim of this work is to investigate the resonance effects and analyze their influence on the change of the fast phase in the spherical motion of the asymmetrical rigid body with flywheels. To explore these resonance effects we applied the method of integral manifolds and the averaging method. The averaged equations showed that resonance effects can lead to the regular precession, to the formation of stationary points, or to the prolonged resonance. In addition, the characteristic features of the influence of secondary resonance effects on the change in the fast phase are revealed.
Application of mathematical modeling to solve problems of optimization of lattice structures
Authors: Burnysheva T V , Shteinbreher O A 
Published: November 2019

Abstract
The paper deals with the application of mathematical modeling for solution of problems of optimum design of mesh structures. We will consider the method of analysis of power circuits for solving problems of structural optimization of such structures. A system for automating a computational experiment, modeling, and numerical calculation is proposed in the paper. The authors consider a mathematical model of joint deformation of the rib structure and skin, presented algorithms for solving the problem of optimal design. The problem of choosing the optimal variant of the arrangement of annular ribs in a cylindrical structure is considered as an example
Computational aspects of Simplification of Mathematical Models of Chemical Reaction Systems
Authors: Safiullina L F , Gubaydullin I M , Uzyanbaev R M , Musina A E 
Published: November 2019

Abstract
The primary objective of this study is to develop a procedure for simplifying the mathematical model of a chemical reaction by reducing the number of steps and species in the reaction scheme. The procedure is based on the sensitivity analysis of the functional model to the change in the model parameters. The application of this procedure makes it possible to accelerate and improve the construction of mathematical models for chemical reactions, as this does not require the calculation of sensitivity coefficients at various time points or sensitivity matrix analysis. The efficiency of using this procedure was demonstrated by comparative results of modeling of formaldehyde oxidation in terms of detailed and reduced schemes. Computational aspects of the solution to the problems of chemical kinetics by the global sensitivity method using the example of the formaldehyde oxidation reaction are presented.
Simulation of formaldehyde formation during a galaxy collision using vectorized numerical method on Intel Xeon Phi accelerators
Authors: Kulikov I , Chernykh I , Protasov V , Gubaydullin I 
Published: November 2019

Abstract
We present implementation of a new vectorized high-order accuracy numerical method for solving gravitational hydrodynamics equations on supercomputers equipped with Intel Xeon Phi in the paper. Combination of the Godunov method, the Harten-Lax-Van Leer method and the piecewise parabolic method on the local stencil is at the basis of the method. It allows achieving high-order accuracy for smooth solutions and low dissipation on discontinuities. We present chemokinetic model of formaldehyde formation based on molecular hydrogen and carbon monoxide. We show the results of numerical simulation of interacting galaxies.
A method of improving the pedestrian accessibility of the urban public transport stops based on a genetic algorithm
Authors: Zubkova E V , Saprykin O N , Saprykina O V , Tihonov A N 
Published: November 2019

Abstract
The article discusses the problem of pedestrian accessibility of public transport stops. Research considers and analyses of existing algorithms that allow solving the localization of public transport stops problem in metropolis. The study suggests a formal mathematical description model of the public passenger transport system with stops and routes. A new method based on functions and operators of a genetic algorithm for optimization of public transport stops dislocation was developed. The proposed method is implemented in Python programming language and has been tested on sample data of the city of Samara.
A new look at Kapitza conductance calculation (thermal boundary resistance)
Authors: Khvesyuk V I , Liu B , Barinov A A 
Published: November 2019

Abstract
The Kapitza resistance of the sapphire-lead interface was calculated using the propagation analysis of the elastic wave at the interface; results are is in a good agreement with the experimental data. We present a detailed analysis of the elastic wave propagation at the interface between two different materials. The energy distribution of the waves transmitted through the interface as a function of the incident angle is obtained to calculate the Kapitza resistance. For the first time, the Kapitza resistance was determined during the heat flux from both sides: from the sapphire side and from the lead side.
Linear and nonlinear versions of Phase Retrieval
Authors: Fedina M E , Novikov S Ya , Rogach D A 
Published: November 2019

Abstract
The problem of Phase Retrieval or Phaseless Recovery can be briefly stated as follows: for a given amplitude or measurements obtained using a redundant system of measuring vectors to restore the original signal. This problem first arose in X-ray crystallography at the beginning of the 20th century. A similar non-linear reconstruction problem arises in the digital processing of speech signals, especially in speech recognition problems. Some achievements in this direction will be shown with simple examples in spaces of small dimensions.
Simulation of transition matrix and strip lines of microwave switch
Authors: Maklashov V A , Piganov M N , Petrov M V 
Published: November 2019

Abstract
The method of microwave switch elements simulation in Microwave Office CAD was offered. The calculation method of the ring power divider was developed. The simulation of transmission strip lines, switch matrix and printed circuit board was carried out. Frequency dependences of standing-wave ratio of the input and output signals, the signal attenuation from input to output and between different pins were received. The topological layout of switch elements was given. The comparison of the experimental data with the results of simulation was carried out.
Mathematical simulation of a pressure field exemplified by dual porosity reservoir
Authors: Bobreneva Y O , Gubaidullin I M 
Published: November 2019

Abstract
The authors analyze the process of fluid transfer in a formation using the example of a porous fractured reservoir rock. A reservoir of this type has a natural-fracture system and is described by a dual porosity model. The most detailed description of a filtration process is provided by Warren-Root equations which analyze fluid redistribution between the matrix and the natural fracturing pattern. In this paper we develop a numerical model of fluid flow processes for a fractured-porous reservoir. The finite difference method is applied to solve partial differential equations. The problem is approximated by an implicit difference scheme. The system of linear algebraic equations at each time layer is solved by the matrix sweep method.
Simulation of the coke burning process on the catalyst grain
Authors: Dubinets O V , Davletova M R , Islamova G I , Gubaydullin I M , Khannanova G D , Akhmetov I V 
Published: November 2019

Abstract
Based on the kinetic model of oxidative regeneration of coked catalysts, a two-phase diffusion mathematical model of the oxidative regeneration process of coked catalysts in a catalyst grain has been constructed. A numerical analysis of the grain heating in a wide range of the initial oxygen concentration, the inlet temperature, VHSV of the gas has been carried out. It has been established that the process of coke burning has a high parametric sensitivity to the initial oxygen concentration.
Mathematical modeling of the propane and propane-propylene cut thermal decomposition process
Authors: Uzyanbaev R M , Akhmetov I V 
Published: November 2019

Abstract
The article describes the mathematical modeling of the propane pyrolysis process. The developed model is a system of ordinary nonlinear differential equations (SONDE), which describes the changes in the concentrations of the components of the substances involved in the reaction over time. The computer implementation of the mathematical model is based on the MathWorks MATLAB programming environment. The program was used to search for the reaction optimal operating conditions: the temperature and the composition of the raw materials of the pyrolysis process.
Some problems for the processes with the compensation of the change-point event
Authors: Burmistrova V G , Butov A A , Volkov M A , Moskvicheva M G , Pchelkina Y Zh 
Published: November 2019

Abstract
In the paper we consider some problems for the processes with the compensation of the change-point event, namely for the adaptive changes of a system. We suppose that compensations could be continuous, discontinuous or combined. The approaches of the change-point description could differ. Depending on the observation method of a change-point stopping time, we consider three types of problems (similar to the methods of filtering, extrapolation or interpolation in partially observable schemes).
Some Approaches to the Estimation of the Stopping Time of the Cross-boundary Event for the Process with the Change-point
Authors: Kovalenko A A 
Published: November 2019

Abstract
In the paper two approaches of estimation of the first boundary crossing time moment are considered. As the first estimate (for the process with the change-point on the interval of observation [0,t]) the conditional mean value expectation of the stopping-time is considered. The second considered estimate is the measurable and observable stopping-time moment for which the conditional mean value of the appropriate process is equal to the value of the boundary.
Simulation of the combined flanging and forming process taking into account the springback effect
Authors: Demyanenko E G , Epifanov A N , Popov I P 
Published: November 2019

Abstract
In this paper, the simulation of the method, which combines the deformation and the investigation of the elastic comeback effect during the forming of the thin-walled shells are presented. The springback value on the edge of the part after removing the deforming force is also evaluated.
Simulation of plastic forming process by variation of geometric parameters
Authors: Demyanenko E G , Epifanov A N , Popov I P 
Published: November 2019

Abstract
In this paper, the complex research method was used which includes theoretical analysis and verification of the results using numerical simulation in the Pam-Stamp 2G solution. During the determination of the stress-strain condition of the workpiece the functional was solved which allows minimal thickness fluctuations of the thin-walled parts during the forming. The radius of the punch was chosen as a variable parameter. Its calculated values served as input parameters for the simulation.
Addressing system and routing without tables in new generation networks
Authors: Lovtsov K N , Mayhoub S , Timofeeva S V , Sukhov A M , Stengach M S 
Published: November 2019

Abstract
The article proposes a new method of bit hierarchical addressing. To record the component of the hierarchical address, two bits of service information are used which show the number of blocks of standard length. To search for a route in hierarchical address environments, the complex method of greedy forwarding with two centers of hierarchy is proposed.
The technology of forming adaptive recovery filters in mobile devices
Authors: Fursov V A , Medvedeva K S , Fatkhutdinova E F 
Published: November 2019

Abstract
This paper deals with the technology of forming adaptive filters to eliminate distortions such as defocus on images recorded using mobile devices. The main purpose of the development is to ensure a sufficiently high quality of the distortion correction with minimal computational costs. The blind parametric identification of the model with a radially symmetric quadratic-exponential frequency response is used to adjust the filter parameters. The algorithm, the pseudo-code of the program and the results of experiments demonstrating the effectiveness of the proposed approach are given.
Creating the self-learning expert system for solving problems with fuzzy logic
Authors: Bakaev V A , Blagov A V , Blagov Yu V 
Published: November 2019

Abstract
There are many different approaches to building expert systems depending on the problem to be solved and the scope. This article includes a review of traditional approaches to building self-learning expert systems with fuzzy logic. The authors propose an alternative approach based on the developed model of the expert system. The article also provides a description of the generation of synthetic tests and a comparative analysis of the author’s approach with existing analogues.
The estimation of phase-coupled channels of EEG signals by patients with traumatic brain injury during cognitive and motor tests
Authors: Tolmacheva R A , Obukhov Y V , Zhavoronkova L A 
Published: November 2019

Abstract
Identical inter-channel phase coherency of electroencephalogram (EEG) signals is determined for healthy subjects during cognitive and motor tests. EEG signal phase is evaluated at the points of it wavelet spectrogram ridge. Areas of interest of the cortex at cognitive and motor tests for group of healthy subjects are determined. Inter-channel EEG phase coherency for patients after a traumatic brain injury are represented.
Intelligent OFDM telecommunication system. Part 2. Examples of complex and quaternion many-parameter transforms
Authors: Labunets V G , Ostheimer E V 
Published: November 2019

Abstract
In this paper, we propose unified mathematical forms of many-parametric complex and quaternion Fourier transforms for novel Intelligent OFDM-telecommunication systems (OFDM-TCS). Each many-parametric transform (MPT) depends on many free angle parameters. When parameters are changed in some way, the type and form of transform are changed as well. For example, MPT may be the Fourier transform for one set of parameters, wavelet transform for other parameters and other transforms for other values of parameters. The new Intelligent-OFDM-TCS uses inverse MPT for modulation at the transmitter and direct MPT for demodulation at the receiver.
Deep learning-based image reconstruction for multi-aperture diffractive lens
Authors: Nikonorov A V , Skidanov R V , Evdokimova V V , Petrov M V , Alekseyev A P , Bibikov S A , Kazanskiy N L 
Published: November 2019

Abstract
Multi-aperture imaging systems are one of the modern trends for imaging devices. The paper presents the results of developing a multi-aperture imaging system based on single diffractive lenses and postprocessing pipeline based on deep learning. The pipeline includes two processing steps: color correction using a generative adversarial network and chromatic deblurring by a convolutional neural network.
The study of effectiveness of a high-performance crystal lattice parametric identification algorithm based on CUDA technology
Authors: Shirokanev A S , Kirsh D V , Kupriyanov A V 
Published: November 2019

Abstract
The study of substances with a crystal structure is a complex multi-step process. The key step in the crystalline substance analysis is the unit cell parameter estimation. The estimation of the crystal lattice unit cell parameters is a particular problem that involves the search of the crystal lattice model’s parameters according to the information which can be extracted from the substance. In these recent times, the most accurate information about the substance structure can be obtained with the electron microscope whose linear resolution is high enough to observe the atomic structure of a substance. The problem of parameter estimation in this case means the reconstruction of the three-dimensional crystal lattice with 2-dimentional images received by an electron microscope, and the estimation of the crystal lattice unit cell parameters by reconstructed lattice. In the previous papers the crystal lattice parametric identification algorithms based on solving the local optimization problem were presented. However, the analysis of a large crystal lattice database requires a lot of computations. In this paper, a high-performance crystal lattices parametric identification algorithm using the CUDA technology is proposed. The investigation of the algorithm effectiveness is carried out on the GPU GeForce NVidia GTX 1070 Ti. With data dimension more than 32 translations the acceleration is higher than 70. The algorithm runs more efficiently at the use of a large number of CUDA-blocks.
ONE-STEP SYNTHESIS OF BINARY MN–CE OXIDES BY A REDOX-PRECIPITATION AS HIGHLY EFFICIENT THEMALCATALYSTS FOR THE RESIDUAL METHANE OXIDIZING
Authors: Zhong Liu , Fang Qingyan , Li Xin , Zhang Cheng , Chen Gang 
Published: November 2019

Abstract
A series of Mn-Ce catalysts with different ratio of Mn-to-Ce were prepared by a redox-precipitation method, and their catalytic performance in lean methane combustion was investigated. A plethora of structural (XRD), textural (BET, FSEM), and spectroscopic (XPS) methods have been applied for characterization. The results show that the catalytic performance of the investigated samples is strongly related to the ratios of Mn-to-Ce. Mn-Ce catalyst with an atomic Mn/Ce ratio of 9/1 provided with a larger specific surface area, pore volumes, abundant manganese species of higher valence (Mn4+), Cerium species of lower valence(Ce3+), and lattice oxygen.
Numerical modelling and optimization of pulverized biomass gasification process
Authors: Donskoy I G 
Published: November 2019

Abstract
Biomass, such as wood, forestry and agricultural wastes, etc., is considered to be a fuel with better environmental characteristics than fossils. The main prospects for the increase in the energy use of biomass are associated with the combustion and gasification in small energy systems, including those being a part of hybrid power plants. One of the ways to improve the efficiency of the gasification process is to increase the temperature by the use of oxygen-enriched gasification agent, as well as grinding the fuel to intensify transfer processes and chemical transformations. Thermodynamic estimates show the possibility of achieving the gasification process efficiency at the level of 80-90%, however, the experimental values rarely exceed 70%. In the present work, by means of mathematical modeling, the possibilities of increasing the efficiency of the biomass gasification process are investigated. The range of optimal conditions is evaluated.
Numerical study on the influence of slit shapes and sizes between the lower wall and the plate on turbulent flow and heat transfer characteristics
Authors: Kong D H , Afanasiev V N , Semenev P A 
Published: November 2019

Abstract
The results of numerical study of flow structure and heat transfer in turbulent flow of air over a flat plate at q
w = const with a rectangular rib with slit channel of different shapes: confusor, diffusor and const cross-section are presented. The slit channel is located between the plate and the lower wall of the rib. Numerical simulation is performed for an incompressible fluid in the framework of three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with a Kato-Launder k-ε turbulence model for turbulence closure. The parameter effects, including the slit channel sizes and shapes (confusor, diffusor and plane-parallel), on turbulent flow structure and normalized local heat transfer coefficients on the heat transfer surface are examined. It is established that the rib with a slit, especially with a confusor, substantially reduces the size of the recirculation region behind the rib due to the effect of the generated near-wall jet on main flow. In addition, in the presence of a slit between the wall and the rib, in transverse direction, a pair of symmetrical extended spots with high values of heat transfer coefficients relative to the middle of the plate is observed. Rib with a consfor slit having a longer confusor part (Case B2) provides the best overall heat transfer performance.
Development and Prospect of the Pumped Hydro Energy Stations in China
Authors: Zhu B S , Ma Z 
Published: November 2019

Abstract
Pumped hydro energy storage (PHES) has been recognized as the only widely adopted utility-scale electricity storage technology in the world. It is able to play an important role in load regulation, frequency and phase modulation and black starts in power systems. Due to its outstanding functions, this technology has been widely used worldwide.
This paper introduces PHES including its functions and the technologies briefly to supply a comprehensive cognition of this technology. The key technologies of PHES, such as design and manufacture of reversible pump-turbine runners, design of heavy-duty thrust bearings and shaft sealings, startup of unit etc., are important for the PHES. In addition, more and more new technologies, such as operation with seawater, underground lower reservoirs, adjustable speed units etc., were put forward and used in PHES to make it perform better.
This paper focuses on the development of PHES in China. Thanks to a rapid development of China’s economy in the recent years, PHES has gained a fast development. At present, China has owned the biggest installed capacity (29.9 GW by the end of 2018) of PHES the world. PHES has been an indispensable part of the power grid to increase the stability of the grid and improve the penetration of sustainable energy such as wind power, solar energy etc. With the employment of new technologies. China’s new PHES stations, such as Guangzhou, Tianhuangping, Xilongchi PEHS etc., have become the representatives of the world’s most advanced level. Based on the requirement of the current power grid for PHES, some new PHES have been under construction and more PHES are in the planning and design stage.