bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear high-amplitude excitations of the CuPt7 crystal lattice: a molecular dynamics study
Authors: Zakharov P V , Cherednichenko A I , Starostenkov M D , Eremin A M , Markidonov A V 
Published: December 2019

Abstract
This article analyzes the structure and properties of the CuPt7 crystal for the possible existence of non-linear high-amplitude oscillations of the light alloy component. The densities of the phonon states of a crystal are calculated and analyzed for its different structures. It is demonstrated that the phonon system of a crystal has a narrow forbidden zone. The dependences of the possibility of the existence of high-amplitude oscillations on the initial conditions are revealed. It is shown that such oscillations are possible with the initial deviation of the Cu atom from the equilibrium position by more than 0.95 Å for FCC CuPt7. For such oscillators, their lifetime, the amount of stored energy, and other characteristics were obtained, which make it possible to characterize nonlinear high-amplitude lattice vibrations.
Heat transfer in magnetic fluids in magnetic and electric fields
Authors: Vegera Zhanna 
Published: December 2019

Abstract
The article presents the results of an experimental study of the heat transfer process in magnetic fluid under the influence of electric and magnetic fields of various configurations. It is shown that a constant electric field leads to an increase in the heat transfer coefficient when a certain threshold value of tension in a thin layer of magnetic fluid is reached. The possibilities of controlling the heat transfer process using the additional effects of homogeneous and inhomogeneous magnetic fields are found.
Nonstationary analytic model of hydrodynamic rolling lubrication
Authors: Ivanov V A , Erkayev N V 
Published: December 2019

Abstract
A model of normal oscillations of a roller moving along the surface at a constant speed in the presence of a liquid lubricant layer is considered. The pressure distribution along the lubricant layer is obtained by integrating the Reynolds equation, taking into account both the tangential and normal speed of the roller relative to the support surface. An analytical solution of this equation is constructed by the method of asymptotic expansion in a singular small parameter. The solution contains both regular terms of the expansion in powers of a small parameter and boundary-layer functions that rapidly decay over time.
Model of fuzzy ultra-acoustic diagnostics of nanocomposite functionally graded plate constructions in mechanical engineering
Authors: Storozhev S V , Storozhev V I , Bolnokin V E , Hai Duong Minh , Mutin D I 
Published: December 2019

Abstract
A description of a numerical-analytical technique for obtaining fuzzy estimates of the physical-mechanical parameters of plates that are exponentially inhomogeneous in thickness from functionally gradient transversely isotropic nanocomposite materials intended for use in mechanical engineering and aerospace technologies is given. The technique is based on the use of uncertain experimental data of measuring the lengths of normal shear elastic waves with different frequencies for different modes of the dispersion spectrum of the plate under consideration having interpretation in form of fuzzy sets. For obtaining fuzzy estimates of physical-mechanical parameters the transition to fuzzy-multiple arguments in the analytical relationships between the physical-mechanical parameters of functionally gradient transversely isotropic nanocomposite materials and the characteristics of ultrasonic measurements are used.
The influence of convective drying on the change of Kirpichev mass-exchange criterion
Authors: Sorochinsky Vladimir F 
Published: December 2019

Abstract
The results of experimental studies of changes in the Kirpichev mass-exchange criterion during drying of grain related to leguminous crops, which are susceptible to cracking and deterioration in quality during drying, are presented. Based on the results of experimental studies of the moisture content of the center and the surface of the caryopsis, regression equations have been obtained to determine the maximum allowable values of the Kirpichev criterion for different grain drying modes, which have been verified by determining the germination energy of the grain.
Numerical modelling of the liquid filtering process in a porous environment including the mobile boundary of the “oil-water” section
Authors: Ravshanov N , Nazirova E Sh , Pitolin V M 
Published: December 2019

Abstract
The paper considers the process of oil-water filtration in a porous medium. To study, predict the main process indicators and make managerial decisions, a mathematical model has been developed, an effective numerical algorithm based on the ideas of differential-difference schemes and the differential sweep method, with the help of which computer experiments can be carried out. When modelling the object of study, the process of displacement of one liquid by another in a porous medium is considered.
Ab initio calculations of the formation polymerized fullerite from endohedral clusters Li@C24
Authors: Greshnyakov V A , Belenkov E A 
Published: December 2019

Abstract
First-principle calculations of a new endohedral cluster Li@C24 proved its stability at room temperature. In the case of bulk compression of fullerite Li@C24, polymerization leading to the formation of a diamond-like LiC24 structure occurs at a pressure of 0.18 GPa. This pressure is an order of magnitude lower than the pressure at which diamond-like CA4 phase can form from clusters C24.
Investigation of the effect of Al plasma treatment on the superconducting properties of YBa2Cu3O7−δ
Authors: Ushakov A V , Karpov I V , Shaikhadinov A A , Demin V G 
Published: December 2019

Abstract
The effect of the partial substitution of Cu for Al on the structural, compositional, and magnetic properties of polycrystalline compounds YBa2Cu3O7−δ was studied. All prepared samples turned out to be single-phase with a small fraction of Ba secondary phases. Substitution of more than 2% aluminum causes an increase in spurious phases. DC susceptibility measurements show that the superconducting transition temperature T C
decreases. Hysteresis loops show that magnetic irreversibility decreases with increasing Al content. The critical current density J C
obtained using the Bean formula does not follow the same change. Al compensates for a decrease in J C
and an increase in its content near the solubility limit gives a higher J C
than in an undissolved sample.
Optimal parameters selection of particle swarm optimization based global maximum power point tracking of partially shaded PV
Authors: Obukhov Sergey , Ibrahim Ahmed , Aboelsaud Raef 
Published: December 2019

Abstract
This paper presents optimal parameters selection of particle swarm optimization (PSO) algorithm for determining the global maximum power point tracking of photovoltaic array under partially shaded conditions. Under partial shading, the power-voltage characteristics have a more complex shape with several local peaks and one global peak. The two proposed controllers include dynamic Particle Swarm Optimization, and constant particle swarm optimization. The developed algorithms are implemented in MATLAB/Simulink platform, and their performances are evaluated. The results indicate that the dynamic particle swarm optimization algorithm can very fast track the GMPP within 128 ms for different shading conditions. In addition, the average tracking efficiency of the proposed algorithm is higher than 99.89%, which provides good prospects to apply this algorithm in the control search unit for the global maximum power point in stations.
Raman gas analyzer for detecting carbon isotopologues
Authors: Vitkin V V , Chubchenko I K , Polischuk A V , Kovalev A V , Popov E E 
Published: December 2019

Abstract
A Raman gas analyzer for detecting carbon isotopologues with an excitation laser with a power of 5 W, generating at a wavelength of 532 nm, focusable in a waist of 7 μm using a lens with compensation for spherical aberration is presented. The signal is detected by a high-resolution spectrometer with a matrix cooled to -40° C. The program optimization of the system parameters is presented: focusing lens, cuvette windows.
Creation of cyber-physical systems based on basic structures in conditions of uncertainty
Authors: Korshunov G I , Polyakov S L 
Published: December 2019

Abstract
The article describes the processes of transformation of the basic structures of technical systems into cyber-physical systems based on the introduction of innovations. A distinctive feature of cyber-physical systems is the direct penetration of methods and means of cybernetics into controlled physical processes in order to intellectualize the system and minimize the influence of the “human factor”. The introduction of innovations occurs in conditions of insufficient information and is always associated with different types of uncertainty. Uncertainty disclosures are based on probabilistic models, fuzzy sets or using knowledge bases. The phased introduction of innovations allows for the reasonable allocation of resources. Basic structures are fundamental technological innovations, represented by functionally necessary and functionally sufficient structures of systems that control physical processes. The article describes the processes of transformation of the basic structures of systems into cyber-physical systems used in various physical environments - solid, liquid and gaseous. As examples, the automatic assembly line of printed circuit boards, the locating system for monitoring thermal networks by the method of monitoring insulation dampening, the system of catalytic neutralization of vehicle exhaust gases are considered. In these examples, the objects of activity are primary physical processes. An in-depth study of primary physical processes made it possible to obtain new informational possibilities for analyzing, interpreting and regulating the key parameters of the above systems based on computing resources.
Rationalization of the process of improving the quality of spatial control systems for unmanned aerial vehicle groupings
Authors: Semenova E G , Ivakin Ya A , Balashov V M , Smirnova M S 
Published: December 2019

Abstract
The article substantiates that the methodological basis for improving the quality of spatial management systems for unmanned aerial vehicle groupings, as part of the concept of monitoring and improving the quality of software and hardware systems for managing heterogeneous robotic aircraft groups and the methodological basis for qualimetric requirements for software and hardware systems for managing unmanned aerial vehicle groupings, allow to achieve rationalization of the development process and improving complexes spatial quality control heterogeneous robotic aviation groupings. Possibilities of reducing time and labor costs for the process of forming and improving the quality of software and hardware systems for managing groups of unmanned aerial vehicles are shown. It is mathematically justified that the use of one integrated model of data structures for software and hardware complexes for managing unmanned aerial vehicle groupings while streamlining the process of improving the quality of spatial control systems for unmanned aerial vehicle groupings based on the proposed methodological foundations leads to an objective saving of resources for the development of these complexes.
The influence of design features on the properties of the metal network
Authors: Testoyedov Nikolay , Dautov Osman Sh , Vygonskiy Yuri , Romanov Anatoly G , Shemyakov A O 
Published: December 2019

Abstract
In this paper, based on the electrodynamic model, the effect of cell pitch, yarn radius of the filament and the conductivity of the material on the network at the reflection, transmission, and absorption coefficients are studied. On the basis of numerical calculations, the fulfillment of the boundary conditions and the power balance of the incident, absorbed, and transmitted fields are shown. An abnormally high power absorption of a set of weaves was revealed at certain radii of the cross section of the thread.
On the analysis of semiconductor materials suitable for the development of a radiation-stimulated power supply based on the nickel-63 radio isotope
Authors: Kovalev I V , Zelenkov P V , Brezitskaya V V , Lelekov A T , Karaseva M V 
Published: December 2019

Abstract
At present, the urgent problem is the development of long-term service life of batteries. If one considers power supplies with a period of more than 10 years, and even up to 50 years of service life, then it is necessary to pay attention to the Nickel-63 radioisotope. The given isotope is safe from the point of view of radiation, but it can generate energy up to 50 years. The article shows that it is necessary to analyze semiconductor materials suitable for its development in the manufacture of a power source based on Nickel-63. Such an analysis is also important for the estimation economic requirements taking into account the increasing miniaturization of electronic equipment. A current level analysis was performed for each semiconductor material.
Optical multilayer anti-reflecting coating in the infrared range
Authors: Novikova Yu A 
Published: December 2019

Abstract
The constant expansion of the applicable scope of optical technologies has led to the need to create optical coatings not only with certain frequency characteristics, but also high performance properties. This article contains the results of a research of a thin optical film from an advanced material SrYF4. On the basis of this film, a multilayer coating was synthesized, which has high transparency in the near and middle infrared range. The coating has successfully passed the climatic tests on resistance to cold and heat.
Mathematical modelling for analysis of self-locking mechanical systems operation in dynamic modes
Authors: Ershov Dmitry , Lukjanenko Irina 
Published: December 2019

Abstract
The paper analyses possible solutions for mathematical modeling in studies of dynamic processes in dynamically self-locking mechanical systems. The research performed is based on the dynamic system with two degrees of freedom conditioned on the system’s inertial and elastic properties. The orthogonal worm gear with equal helix angles is taken as an example. The paper studies two modes of operation: forward movement and reverse movement. The resulting mathematical model allows determining parameters conditioning self-locking properties of mechanical gears.
The use of multiconductor strip structures for splitting an ultrashort pulse in its generation systems
Authors: Belousov A O , Romanchenko I V , Gazizov T R 
Published: December 2019

Abstract
The article explores the ways to use multiconductor strip lines (SL) for solving the problems of generating a bipolar and unipolar pulse oscillations packet. Reflection-symmetric and five-conductor microstrip structures, as well as their various configurations, which are cascade-connections of these SLs are considered. The maximum conversion efficiency of a unipolar nanosecond pulse into high-frequency oscillations is estimated to be less than 1–2%. The results are important for further research and the possibility of using SLs for such tasks.
The determination of the dependence of the cavern length on the flow velocity on an experimental hydrodynamic workbench
Authors: Radzyuk A Yu , Kulagin V A , Istyagina E B , Pyanykh T A , Grishina I I 
Published: December 2019

Abstract
An experimental installation for studying developed cavity flows is described, including a separator for removing free air and gases from the stream, and a device for determining the flow rate. Experiments of flow around the restriction in the form of flattened cone were carried out. The dependences of cavern sizes and pressure on the working section from the free-steam flow velocity are obtained.
Physical basis of the remote monitoring method of pile foundations of building structures in permafrost areas
Authors: Shaidurov G Ya , Amelchugov S P , Igolkin V I , Tronin O A , Radaev V V 
Published: December 2019

Abstract
The article discusses urgent problems for the northern regions of monitoring the integrity of piles and parameters of the surrounding soil by seismoacoustic and electromagnetic methods and the tasks of remote monitoring for a long time. The possibility of controlling the piles by measuring the intrinsic resonant frequency of the borehole by the acoustic method and the parameters of the surrounding soil using temperature and humidity sensors with an estimate of the tangent of the angle of loss of electromagnetic fields at frequencies of 0.02–1 MHz is estimated.
Development of a condition monitoring system for compressor equipment with neural network data analysis
Authors: Zyryanov D K , Bukhtoyarov V V , Bukhtoyarova N A , Kukartsev V V , Tynchenko V S , Bashmur K A 
Published: December 2019

Abstract
Currently, one of the most widely used and effective types of technological equipment is screw compressor equipment. Along with the fact, that such equipment has a number of advantages that determine its high efficiency, it is characterized by increased wear of important structural elements. This can lead to reduced compressor efficiencies and malfunctions that can result in emergencies. In this regard, the paper presents the results of developing a scheme for continuous monitoring of the technical condition of screw compressor units. Variants of installing vibration sensors that provide data collection of vibration diagnostics are determined. In order to automate the analysis of the collected data, it is proposed to use the method of data mining based on neural networks to recognize the technical condition. The results of testing the neural network data method of a real compressor unit are presented.
Evaluation of the efficiency of prefilter models using numerical simulation
Authors: Soloveva O V , Solovev S A , Khusainov R R 
Published: December 2019

Abstract
In this work, we estimate the contribution of the prefilter to the operation of the filter-prefilter system and propose two models of prefilters with curved plates. Numerical calculations of the aerosol flow in various combinations of filters and prefilters are carried out. We calculate the particle deposition efficiency of different filter models. The prefilter in the case of five and ten plates increases the limit of deposition efficiency for open cell foam material. A prefilter with five curved plates with parameters l=0.33 mm and h=4 mm is more preferably in comparison with ten plates with parameters l=0.33 mm and h=2 mm.
Problem formulation of analytical characterization of part surface layer hardened by a moving elastic indenter
Authors: Abulkhanov Stanislav , Khaimovich Alexander , Leonid Khudobin , Bobrovskij Sergej , Lukyanov Aleksey , Levitskih Olesja , Polyanskov Yuriy 
Published: December 2019

Abstract
The development of manufacturing engineering leads to the bill of goods expansion that work in extreme conditions and are made of new steels and alloys. Unfortunately, the traditional technological methods are not able to ensure the necessary performance characteristics of parts surfaces. Diamond smoothening is a well-behaved technological method that allows to finely controlling the quality parameters of the layer surface. However, we consider that the physical processes that occur in the interface between the indenter and the hardened surface are not well understood. A deeper understanding of the physical processes occurring in the contact zone will expand the scope of surface hardening by smoothening. In our work, we tasking the physical boundary conditions in the contact zone between the hardening tool and part surface.
Analysis of factors influencing tribological characteristics of lubricating oils and methods of their control
Authors: Lysyannikova N N , Shram V G , Lysyannikov A V , Kovaleva M A , Bolshakov A S , Kirpichenko A A 
Published: December 2019

Abstract
Methods and means of controlling the tribological characteristics of lubricants are presented. The advantages and disadvantages of four-ball and three-ball friction machines are considered. The analysis of factors influencing the intensity wear of the tribological conjugation of friction units is carried out. The research results of commercial and working motor oils are presented and their tribological properties are evaluated by the method of controlling the wear resistance of friction pairs.
Development of an application with a graphical user interface (GUI) to compute in parallel in the OpenFOAM environment
Authors: Chitalov Dmitri I 
Published: December 2019

Abstract
Means of man-computer interaction have passed a complicated path of development. Nowadays they look like visually easily understandable interfaces with graphical elements on a monitor screen. Interfaces allow forming initial data (ID) for a program and visualizing results. A major part of software has in-built graphical environments to interact with a user. Some open source environments, e.g., the OpenFOAM used for numerical simulation of continuum mechanics (CM) problems, have no in-built graphical means and are designed to operate with a command line. Even though some developers of software environment have provided their decisions of the problem, the problem remains acute as the available decisions are not lacking in drawbacks. The paper focuses on the description of features of the creation of an original graphical environment to operate with OpenFOAM for CM problems computing in parallel. With this aim in mind a list of required tasks is made out and the needed tools are designated: programming language Python 3.5, framework of graphical elements PyQt5 and development environment PyCharm. Diagrams describing structure and behavior of the developed application are worked out. The results of development and testing of the application are shown through the example of one of standard training tasks of the OpenFOAM distributive. Statements that have scientific novelty of the development are formulated, the practical use of the development is defined. A balance of work is stricken and prospects of further study in the direction are identified.
Development of an effective model of parallel processing of multimedia data on the CPU and GPU in the cloud system
Authors: Shardakov V , Parfenov D , Bolodurina I , Izvozchikova V , Zaporozhko V , Mezhenin A 
Published: December 2019

Abstract
The paper deals with the technology of paralleling processing multimedia data process on the CPU and GPU of the user’s personal computer. To do this, we have developed an algorithm for planning the sharing of video accelerators, which controls and distributes the load between the processor and the GPU. The main difference of the proposed algorithm is that the integral transformations include the stabilization of three-dimensional objects and textures. Defining a unique sequence number allows you to apply optimal texture filtering when scaling for each object. These actions create optimal video acceleration when processing objects.