bluuebunny/crossref_metadata_2025 huggingface dataset:
Orthography matters!: the ideologies, insecurities and global politics of the1990 Portuguese Language Orthographic Agreement
Authors: Washington Adrienne R.
Published: November 2019

This paper explores linguistic ideologies surroundingThe 1990 Portuguese Language Orthographic Agreement. The reform, which aims to uniformize Lusophone orthographies and strengthen Portuguese as a global language, is approached through the reactions of native speakers participating in an online debate within a Portuguese-language blog. Drawing on the notion that language planning is a personal, political and ideological rather than a purely linguistic enterprise, the study focuses on the social meanings assigned to Portuguese orthography by the Lusophone debaters. Upon so doing, it tracks the different ideologies orienting participants’ arguments for or against the reform, showing the interplays of language ideologies with culture, nation and citizenship; how linguistic practices and language-mediating technologies, like orthography, become sites of ideological (re)production; and how “folk” and “expert” perspectives about language are not distant but rather dialectically inform and implicate one another, with local debate discourses embedded within broader and older social process and relations.
Axicon for imaging spectrometer
Authors: Blank V A , Strelkov Yu S , Skidanov R V
Published: November 2019

The operation of the imaging spectrometer based on the axicon is modelled in the Matlab. The imaging spectrometer consists of an annular scanning slit, lenses and axicon. Simulation conducted for two schemes: non-imaging and imaging. We simulated and showed that it is possible to obtain a spectral resolution of 10 nm and a point spread function of 30-50 μm. We obtained the spectral distribution from a model object with parts in which the wavelength of monochromatic radiation took one of three values: 0.46 μm (blue), 0.54 μm (green), 0.70 μm (red).
Modeling the electron-photon interaction in monolayers of graphene and transition metal dichalcogenides in a tight binding approximation
Authors: Hussein S M R H , Kharitonov S I , Kazanskiy N L , Pavelyev V S , Kozlova I N
Published: November 2019

In the presence of a strong electromagnetic field, the spectrum of charge carriers in a Dirac material is changed. The interaction of a linearly polarized field with electrons in the Dirac material leads to anisotropy. The anisotropy axis coincides with the direction of the electric field in the linearly polarized wave. We show that the major contribution to the interaction of electrons with an electromagnetic field comes from elastic scattering processes, whereas taking into account inelastic processes leads to an error of about 2%.
Simulation of laser light focusing by a dielectric nanocylinder with gold core
Authors: Savelyeva A A , Kozlova E S
Published: November 2019

Using the finite difference time domain method it was shown that a nanocylinder from silica glass with a diameter of 360 nm and a gold core of 40 nm focuses TM-polarized laser light into a nanojet with a full width at half maximum of 298 nm. Maximum intensity in focal spot is about 4 times higher than intensity of incident Gaussian beam.
Analysis and optimization of photonics devices manufacturing technologies based on Carbon Nanotubes
Authors: Tripathi N , Pavelyev V S , But V S , Lebedev S A , Kumar S , Sharma P , Mishra P , Sovetkina M A , Fomchenkov S A , Podlipnov V V , Platonov V
Published: November 2019

The analysis and optimization of optical devices manufacturing technologies based on carbon nanotubes intended for work in the visible range were carried out. These processes studied in the work have practical application for the deposition of carbon nanotubes and their subsequent use as materials for prototypes of the waveguide and sensor of the visible range. To obtain a layer of carbon nanotubes, a chemical vapor deposition chamber was used. A dense horizontal network of CNTs was grown on silicon wafer by utilizing sandwich type catalyst structure. The growth was carried out with two variable parameters: flow rate and flow duration. Various aspects of the CNTs synthesis, mechanism of CNTs growth and power dependent laser sensing are considered in this article. The remarkable properties of as developed photo detector are its fast response and recovery time with 8% sensitivity.
Metalens for polarization conversion and focusing of laser light
Authors: Stafeev S S , Nalimov A G , Kotlyar V V
Published: November 2019

We investigated 16-sector metalens that converts linearly polarized laser light to azimuthally polarized optical vortex and focuses the beam. It was shown that the metalens produces a focal spot with subwavelength diameters: FWHMx = 0.32λ and FWHMy = 0.51λ (experiment) and FWHMx=0.37λ и FWHMy=0.49λ (FDTD-simulation).
On the phase field model for microstructure evolution during selective laser melting of powder bed including diffusion-induced stresses
Authors: Mirzade F Kh
Published: November 2019

In this paper, we develop a phase field model for microstructure evolution in laser powder-bed additive manufacturing processes, which allows for the effect of elastic stresses due to diffusion of atomic defects (vacancy and interstitial atom) generated at the moving liquid-solid interface. The governing equations of the model including a time-dependent Ginsburg-Landau equation for the phase field with additional stress term, a diffusion-drift Cahn–Hilliard like equation describing atomic defect dynamics, an energy balance equation for the temperature change, and finally the mechanical equilibrium equation for the elastic displacement fields are derived within a thermodynamic framework based on entropy generation guaranteeing thermodynamic consistency. The most simple 1D and isothermal equilibrium situation is considered to study phenomenon of diffusion-flexural instability with the atomic defect clustering and periodic distributions of defects. The effect of this instability on the exfoliation of deposited thin layers on a substrate is also discussed.
Modelling and record technologies of address fiber Bragg structures based on gratings with two symmetrical pi-phase shifts
Authors: Morozov O G , Sakhabutdinov A Zh , Nureev I I , Misbakhov R Sh
Published: November 2019

Address fiber Bragg structures (AFBS) make it possible to effectively solve the problems of interrogation and multiplexing of sensors in multi-sensor networks with microwave photonic processing of information. Based on a complex method of transmission matrices and the coupling of directional modes, a mathematical model was constructed to determine the spectral profile of a fiber Bragg grating with two discrete symmetric phase π shifts (2π-FBG). Based on the study of the mathematical model, the possibility of selecting the necessary parameters of 2π-FBG AFBS is shown, which allow forming its spectral profile in such a way that the specified structure can be used as a sensitive element of the sensor and provides the necessary linear displacement in the optical range and preserves the required frequency separation – address – between discrete symmetric phase shifts location in the radio frequency range. The analysis of the formation and recording methods for 2π-FBG AFBS was carried out. To implement given structures, the technology, using of an ultraviolet argon laser, the classic phase masks with sequential recording of several arrays with precise movement of the fiber were chosen. Further paper deals with issues of interrogation of the developed structures in few- and multi-sensor implementations.
Analytical calculation of diffraction order intensities for a hyperspectrometer
Authors: Rastorguev A A , Kharitinov S I
Published: November 2019

We employ a geometric optics approach to calculate the eikonal of a light field at the output of a diffraction grating in the immediate microrelief vicinity. Analytic relations to calculate the diffraction order intensities as functions of the grating step height, line spacing, wavelength of incident light, and incidence angle are deduced. By way of illustration, intensities of the diffraction orders for a blazed reflection grating with a 555-nm operating wavelength utilized in hyperspectrometers are calculated.
A compact imaging hyperspectrometer
Authors: Ivliev N A , Podlipnov V V , Skidanov R V
Published: November 2019

The paper describes the design of a compact hyperspectrometer equipped with a transmission phase diffraction grating, which is used as a dispersing element. The calculation of the microrelief parameters of the dispersing element is given. The spectral characteristics of the developed device are investigated. The possibility of determining the normalized vegetation index is demonstrated. The weight and dimensions of the compact imaging hyperspectrometer are given.
Optical phase retrieval with the image of intensity in the focal plane based on the convolutional neural networks
Authors: Dzyuba A P
Published: November 2019

One of the most important factors for improving the resolution of optical systems is to compensate for the aberrations (distortions) of the wave front. As a rule, whether special measuring devices (wavefront sensors) are used for such compensation or adaptive mirrors that perform iterative correction of the wavefront. However, often (for reasons of compactness or weight reduction), it is not possible to use the special equipment for measuring aberrations. To obtain certain information on the wave front, one can use the measured point spread function (PSF) or the intensity pattern in the focal plane. Methods of processing two PSFs (focal and nonfocal) with the help of neural networks are known. In this paper, we investigate the possibility of recognizing the wave front from a single intensity pattern in the focal plane. The technology of deep machine learning - convolutional neural network is chosen as the way for implementation. The idea of this technology lies in the alternation of convolutional and subsampling layers, for the purpose of efficient image recognition. Such approach will allow to optimize the process of compensation of optical system aberrations and to reduce the amount of required input data.
Impact of the evanescent waves on the backflow of power in the near field
Authors: Kotlyar V V , Kovalev A A , Kalinkina D S
Published: November 2019

For an elliptically polarized optical vortex with an arbitrary integer topological charge, using the expressions for all six components of the electric and magnetic field strength vectors, we obtain an expression for the longitudinal component of the Poynting vector in the initial plane. For the particular case of a narrow angular spectrum of plane waves (Bessel beam) and for the circular polarization, it is shown that in the presence of the inhomogeneous evanescent waves in the initial light field, a reverse flux of light energy can occur near the op-tical axis. It is shown that this reverse energy flux is due to toroidal vortices in the longitudinal plane.
InP/InGaAs photocathode for hybrid SWIR photodetectors
Authors: Smirnov K J , Davydov V V , Batov Y V
Published: November 2019

The technology of creation the photocathode with quantum efficiency at the level of 5% based on the InP/InGaAs heterostructures is given. The effect of decreasing the quantum efficiency of the photosensitive structure on radiant sensitivity is considered. Several variants of realization of vacuum photoelectronic device with InP/InGaAs photocathode for special purposes are represented.
Bessel beams formation by hybrid axicons
Authors: Ganchevskaya S , Skidanov R , Vasilev V
Published: November 2019

We present a new type of diffractive optical elements (DOE) – hybrid axicons. The process of formation of identical intensity distributions in focus by different hybrid axicons on the example of Bessel beams is shown. The beams order is determined by the sum of the topological charges of the phase plate (structure charge) and the spiral axicon (zone charge). The results of mathematical modeling of light diffraction on hybrid axicons are presented.
Microtechnology in computer optics
Authors: Danilov V A
Published: November 2019

The article briefly describes the development of microtechnology in the field of diffractive computer optics. The author presents the material based on the development of the laboratory of micro- and nanotechnology of Image Processing Systems Institute of the RAS. The creator and head of this laboratory was Doctor of Technics, Professor Alexey Volkov, a well-known expert in the field of electronic and vacuum technologies. The author analyzes the impact of scientific results of Professor A.V. Volkov on the development of diffractive optics.
The choice of methods for the construction of PCA-based features and the selection of SVM parameters for person identification by gait
Authors: Strukova O V , Myasnikov E V
Published: November 2019

The paper presents the results of the continued research of the principal component analysis (PCA) and support vector machine (SVM) techniques for person identification by gait. The experimental studies performed using the CASIA GAIT dataset allowed us to compare two methods of work with input data for PCA. According to the results of experiments, the optimal method of forming the feature space and the most effective parameters of the SVM-classifier were selected. The classification of video sequences recorded by video cameras located frontally, at an angle and orthogonal to the direction of objects movement was carried out.
Camera and auxiliary sensor calibration for a multispectral panoramic vision system with a distributed aperture
Authors: Kudinov I A , Nikiforov M B , Kholopov I S
Published: November 2019

The constructions of test objects for calibrating cameras of the visible and infrared ranges that make up the panoramic survey optoelectronic system, as well as calibration algorithms for auxiliary inertial microelectromechanical sensors for determining the angular position are considered. The results of image forming from a virtual camera that realizes the transfer of the centre of the generated panoramic video image to the observer’s placement point are presented. As part of the field experiment with cameras of the visible and long-wave infrared ranges, it was shown that calibration of the sensors of the panoramic system with a distributed aperture at a known distance to the objects of observation results in an error of combining multi-spectral images of not more than 3′.
Preliminary ICP stage for data-thinning based on object geometry
Authors: Tihonkih D , Makovetskii A , Kober V , Voronin A
Published: November 2019

Basically, the I CP algorithm steps are as follows: for each point i n the first set, match the closest point in the second set; estimate mapping parameters using the RMS cost function; transform points using estimated parameters; perform multiple iterations (reconnecting points, and so on). In this paper a preliminary data-thinning algorithm is proposed. It can help to speed up all ICP algorithm stages by reducing the amount of input data. The proposed algorithm is based on the human perception of objects geometry. A human often analyzes edges and corners of objects and does not pay attention to the inner parts of polygons when comparing two objects and looking for similar parts. The algorithm described in this article begins with a search of planes in point’s cloud. Next, the search for intersection of the found planes is performed in order to extract object edges. Finally, the intersection of the edges help us to get object corners. Further, all points not belonging to the edges and corners are removed from the point cloud. In real objects polygons most often occupy a large part of the object, therefore the proposed algorithm allows to get rid of a large number of insignificant points.
Analysis of the Image Spectrum for Distortion Diagnostics
Authors: Chochia P
Published: November 2019

The diagnostic of possible distortions in given visual data is a significant problem in signal and image processing. In the paper, we discuss the task of automatic determination of the type and parameters of expected distortion on the analysis of the obtained image. In solving the problem, we restrict the research by the identification of linear homogeneous convolution operators of the following three types: circular form with rectangular profile, circular form with Gaussian profile, and linear motion blur ones. The diagnostics identification procedures base on the image spectrum analysis and use the mean radial profile of the image spectrum amplitude. For every distortion type, we elaborate corresponding diagnostics procedures, that when combined into one common process, form a unique recognition algorithm. The studies and experiments demonstrate the reliability of distortion identification algorithms against signal precision and noise influence.
Localization of diabetic macular edema areas via graph-based segmentation of OCT retinal images
Authors: Ilyasova N Yu , Shirokanev A S , Demin N S , Zamyckij E A
Published: November 2019

We propose a technique for localization of diabetic macular edema areas via graph-based segmentation of OCT retinal images. The relevance of the research is associated with the high incidence rate of severe eye conditions due to diabetic macular edema among the world population. The technique relies upon a highly efficient graph-based image segmentation. Using a set of specially selected parameters, the accuracy of retinal area segmentation is enhanced. Optimal parameters found in the course of research have enabled a segmentation error of 2% to be achieved.
Research and development of hierarchical models of automated control systems for the parameters of the radio-line of the cognitive radio system
Authors: Blagodatsky G A , Kopysov A N , Khvorenkov V V , Baturin I S
Published: November 2019

The paper considers a five-level model of a cognitive radio communication system. It was revealed that the value of the influence of natural factors and the effects of the enemy is comparable, but several times less than the state of the radio communication system. The observer’s device and the regulator are important for the effective transmission of information and the controlled process and the internal state of the information transmission system are less important. The goal of reducing the number of errors in the transmission of information and increasing the speed of information transmission are important for the effective transmission of information, in comparison with a reduction in the computational load on the formation of signal-code structures and a decrease energy used for transmission. The highest efficiency of the radio system can be achieved through the use of optimal signal processing algorithms, and high power of the transmitted signal. High speed of information transmission will not give a tangible effect when transmitting information in difficult conditions without the necessary power of the radio link and signal processing algorithms.
Dynamics of the electrochemical reaction behavior under the influence of random perturbations
Authors: Firstova N
Published: November 2019

The paper deals with the effect of random perturbations on critical phenomena in a dynamic model of an electrochemical reaction. Classical theories predict that solutions of differential equations will leave any neighbourhood of a stable limit cycle if white noise is added to the system. The effect of external disturbances on the limit cycle is investigated, the sensitivity of the cycle to the noise is found. An analysis of the noise-induced transitions is performed.
A stochastic approach to the solution to the differential equation of heat transfer in the atmosphere
Authors: Nozhkin V S , Semenov M E , Ulshin I I
Published: November 2019

In this work, a model of heat transfer in the atmosphere is proposed. This model is based on a stochastic interpretation of the velocity vector components. Histograms of the wind speed distribution averaged over a relatively short time interval are obtained and analyzed. The proposed model is formulated based on empirical distributions. Explicit expressions for the first and the second-moment functions solving the heat transfer equation with random coefficients are presented. A function that estimates errors resulting from replacing a random coefficient in an equation with its mathematical expectation is also obtained. An example that demonstrates the effectiveness of the proposed approach in the case of a Gaussian distribution of the horizontal component of wind speed is presented. In this case, the first and second-moment functions in the frame of the proposed model are presented.
Fractional analysis of induced resonance effects in the spherical motion of a rigid body with flywheels
Authors: Lyubimov V V
Published: November 2019

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

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

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

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

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.
Four – dimensional models for control system typical units
Authors: Klimanova E V , Maksimov A V
Published: November 2019

This study examines the possibility of applying different forms of complex numbers and quaternions for control system typical units modeling. The hypothesis is that the current understanding of development may be expanded by making use of different mathematical objects and approaches. As a result four-dimensional general models have been obtained.
A new look at Kapitza conductance calculation (thermal boundary resistance)
Authors: Khvesyuk V I , Liu B , Barinov A A
Published: November 2019

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Particle Size Measurement of Reaction Product Aerosol of Sodium-Oxygen
Authors: Deguchi Y. , Kamimoto T. , Kikuchi S. , Kurihara A. , Takata T. , Ohshima H.
Published: November 2019

A multi-level scenario simulation system as a safety infrastructure technology is required for design optimization, safety margin adjustment, and innovative technology developments of sodium-cooled fast reactor (SFR). In order to properly implement the Verification and Validation (V & V) of the simulation system, it is indispensable to ensure experimental database of sodium chemistry as specific SFR safety issue. In this study, measurement results of aerosols generated by sodium-oxygen reaction for sodium fire event were reported with the aim of clarifying the radiation heat transport phenomena in the reaction field. The sodium-oxygen counter-flow diffusion flame was formed one-dimensionally above the sodium pool by the reaction between sodium vapour and oxygen. Argon (Ar) including 2% oxygen were introduced to a liquid sodium pool (temperature: 820K) under the reduced pressure condition (0.05MPa). Ar guard flows were employed to stabilize the reaction. The reaction continued more than 600 seconds without any changes in terms of flame shape and position. Aerosol size was measured as a function of Z (the distance from the sodium pool surface) and r (the distance from the center of the sodium pool). Laser Induced Incandescence (LII) and the Mie scattering method using the different wavelength laser beams (405nm, 450nm, 520nm, 532nm, 638nm and 650nm) were employed to ensure the measurement accuracy. Aerosol sizes from several hundred nm to 1 μm were measured in this reaction field and the aerosol size increased toward the sodium pool. This stemmed largely from aerosol growth and polymerization because the flow rate decreased near the sodium pool. It was also confirmed that the size of aerosol measured by LII was in good agreement with the measurement using the Mie scattering method under the same conditions. The refractive index of the aerosol was also evaluated to be 1.42-0.5i.
Stefan Problem with Internal Heat Generation: Comparison of Numerical Modeling and Analytical Solution
Authors: Crepeau J C , Yu Sakhnov A , Naumkin V S
Published: November 2019

The Stefan problem with internal heat generation can be found in various industrial applications. In particular, this problem describes melting of nuclear fuel rods during a reactor emergency. The present study reports on numerical modeling of the heat conduction equation and the Stefan equation with an application of the method of catching of the front into a space grid node. To solve numerically the heat conduction equation we realized an implicit four-node scheme using the Thomas method and iteration procedure.
Experimental study of local void fraction distribution in bubble flow in rod assembly
Authors: Vorobyev M A , Kashinsky O N
Published: November 2019

In this work an experimental study of local void fraction distribution in square arrangement rod bundle channel 3 * 3 under bubble flow regime was carried out. Measurements were performed with conductivity probe help, which was introduced into the flow through an angular or side rod at an angle of 15° to the flow. This method made it possible to determine the local void fraction close to the walls of the rods and in the narrow gap between them. Measurements have shown that a dome-shaped profile of local void fraction is realized in the gap between the side rode and the central one, while a saddle-shaped distribution of the void fraction is observed on the line connecting the central and angular rods. Also the effect of the spacer grid on the distribution of the gas phase in the channel was shown.
Investigating characteristics of diesel fuel spray in a perspective burner
Authors: Anufriev I S , Kopyev E P , Mukhina M A , Osintsev Ya A , Yu Shadrin E
Published: November 2019

Gas-droplet flow at diesel fuel spraying by superheated steam jet has been experimentally investigated in this work with the use of interferometric method (IPI). Data on the dispersed composition of the steam-fuel jet have been obtained in a wide range of operating parameters (steam and fuel flow rates) corresponding to the area of stable operation of the burner. Dependences of droplet sizes in the flow on the regime parameters have been established.
Explosive vaporization of water-based nanofluid on a flat microheater
Authors: Kozulin I A , Kuznetsov V V
Published: November 2019

The explosive vaporization of the nanofluid formed by water and SiO2 nanoparticles on a heater with the size of 100×110 μm was studied. In experiments, the reflected optical signal produced by heater lighting using laser beam was measured. The patterns of the initial stage of the nanofluid explosive vaporization were obtained and the effect of nanoparticles on the nucleation temperature was discussed. The variation of the nucleation temperature and vaporization time depending on the temperature increase rate was defined.