bluuebunny/crossref_metadata_2025_split huggingface dataset:
Environmental monitoring and its methods and technical means of environmental protection in the area of technical responsibility of oil and gas industries
Authors: Topchiev A G 
Published: May 2020

Abstract
The paper aims to reason the need to create a system of local air monitoring system which functions in interaction with monitoring systems located on the orbital space platforms. A comparative analysis of drones and aircraft of the ultra-light class as platforms for carrying out on-board aerial survey equipment has been performed. The configuration and functioning principles of an interactive on-board local monitoring system protected by patents of the Russian Federation are discussed. The advantages of the local air monitoring system designed for the implementation of environmental protection projects in the oil and gas infrastructure are analyzed. The scope and the list of functional tasks to be solved in the interests of the oil and gas industry of the Russian Federation are determined.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Dislocation structure of dicotyledonous bimetals under external harmonic influence: molecular dynamics modeling
Authors: Zakharov P V , Eremin A M , Safronova S A , Markidonov A V , Starostenkov M D 
Published: May 2020

Abstract
In this article, we study the structure of the network of dislocations near the boundary of a dicotyledonous bimetal Ni-Al under intense external harmonic influence. The method of molecular dynamics was chosen as the method, using potentials obtained by the immersed atom method. The paper analyzes the behavior of dislocation segments as a function of the intensity of exposure in the presence of vacancies near the boundary of a bipartite bimetal. It is shown that the frequency of exposure significantly affects the change in the structure of bimetal. In this case, point defects in the form of vacancies play an important role. The analysis was carried out by heating the calculated cells, the temperature of which is not more than half the melting temperature of the materials. Comparison with annealing of defects showed that structural changes in dislocations occur at lower temperatures, and their flow rate is higher.
Training specialists in material sciences and aerospace engineering using the interactive educational environment
Authors: Dubovitskaya T V , Tatyanina E P , Turaeva T L , Habarova O S , Zaslavskaya O Yu 
Published: May 2020

Abstract
The article considers the actual topic of using a computerized educational environment through an interactive whiteboard in the process of training specialists in the field of materials science and aerospace engineering at a university. The use of technical teaching aids in practical classes is becoming very common in modern educational practice. It allows the educational process to be carried out in new conditions, when the teacher ceases to be the only source of information for students. The article reveals the possibilities of using an interactive whiteboard in practical classes, provides examples of the use of this learning tool when studying certain topics from a physics course.
Compressor disc structural optimization for gas turbine engine
Authors: Hoang Nhat Minh , Chu Duy Lanh , Nguyen Phi Minh , Nguyen Tien Quyet 
Published: May 2020

Abstract
Gas turbine engine compressor increases the pressure and temperature of the air stream through it before entering the combustion chamber. Due to the extreme in rotational speed and high temperature, the gas turbine engine compressor is subjected to a complex force system that causes different failures mode in the compressor disc. Therefore, the design and calculation of compressor discs always consist of very high requirements with the problem of reducing the volume and increasing the durability of the disc structure. This paper presents a computational method that optimizes the design of a compressor disc geometry that meets performance and durability parameters but has the lowest mass based on finite element method. The calculation program is implemented by software Abaqus 6.13, algorithms and analysis results are processed through the Python 3 programming language.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Remote diagnostic capability of aircraft special equipment
Authors: Abdukayumov A , Maturazov I S 
Published: May 2020

Abstract
The article presents the methods of remote diagnostics of special aircraft equipment. The methods of remote diagnostics used on aircraft are analyzed. Based on an analysis it is proposed to create a new method of remote diagnostics of special equipment of aircraft.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Diagram of plastic material transition into brittle state under hydrogen saturation
Authors: Mironov V I , Emel’yanov I G , Lukashuk O A 
Published: May 2020

Abstract
Major progress made in theoretically describing the behavior of a «hydrogen-metal» system still fails to unambiguously explain the phenomenon of hydrogen brittleness in metals. It follows that a phenomenological approach is appropriate to describe the transition of a plastic material into its brittle state with the growth of hydrogen concentration. A diagram for such a transition is plotted on the basis of known experimental data on how hydrogen affects mechanical properties of structural steels. It is intended for the purposes of predicting the behavior of fracture observed in elements of metal structures under peak overloads or normal operation.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Modeling of the thermal stresses in the welded rails of the continuous welded track in the permafrost zone
Authors: Fazilova Z , Loktev A , Shapran V , Chizhikov I 
Published: May 2020

Abstract
The article focuses on the numerical methods that are used to solve heat conduction nonlinear problems with the help of the h-matrix to account for the relaxation of thermal stresses in continuously welded rails. A general mathematical model on the basis of the heat conduction nonlinear equation is presented to calculate the thermal field in an infinite unlimited plate. The developed mathematical model can be applied to choose the implementation modes of the continuously welded rails into the optimal thermal mode.
Assessment of road pavement durability taking into account the variability of the traffic load parameters
Authors: Ermoshin N A , Bukatov D C , Filippov D A , Tsyba A C , Stroganov A V 
Published: May 2020

Abstract
The paper presents a methodology for calculating the influence of traffic load parameters on the durability of road pavement, such as elastic deflection, continuity of monolithic layers and shear resistance, the degree of influence of which depends on the reliability of the road in order to maintain the predicted characteristics of the traffic flow during the pavement inter-maintenance period. The developed methodology will allow for timely planning of measures for the maintenance and repair of road structures.

A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.
Remaining lifetime forecasting based on the dynamic simulation of used continuously welded rails
Authors: Loktev A , Fazilova Z 
Published: May 2020

Abstract
One of the basic principles of the modern track facilities policy is the maximum life extension of the permanent way elements less than 1,1 bln. tonnage. This policy allows to increase the competitiveness of the railway transport. The article is devoted to the research of the dynamic load impact on the target remaining lifetime of a continuously welded rail. The article also contains the results of the research that describe how some rail segments work under the load of different types, including pre-stress that develops under fastening the rail in the track and under the accumulation of the residual stress in operation.
Impact of damping on decay time of free oscillations in metal structures
Authors: Mironov V I , Ogorelkov D A , Lukashuk O A 
Published: May 2020

Abstract
The problem of increase of durability of the bearing thin walled metal structures of hoisting - and - transport machines maybe solved by means of structural damping which allows to increase the logarithmic decrement of the damped oscillations. In the work there are given the results of modelling and experimental check of the advantages of usage low-modulus foam materials as fillers at a structural damping of thin walled elements of metal structures. With the help of computational package SolidWorks there was conducted a numerical study to define amplitude-frequency characteristic of laboratory machine and then there were run the tests of model structure with building vibrorecord. As a result if research there was revealed a significant increase of the logarithmic decrement and reduction of the time of decay of natural oscillation of the foamed structure. Consequently, there are shown the advantages of the further researches to use energy-intensive foam materials to dampen the elements of the structures of handling machinery.
Daily strength testing of the Portland cement mortars
Authors: Tararushkin E V , Shchelokova T N 
Published: May 2020

Abstract
The study of daily tests (1-28 days) for compressive and flexural strength of cement mortars is presented in the article. The mortars were made from ordinary Portland cement, two different classes of cement were considered. Graphs with daily test strengths were obtained from the results of the experiment and the test results were fitted by exponential curves. To estimate the strength rates of mortars, numerical derivatives are calculated from experimental data and the exponential curves are fitted by the obtained values of numerical differentiation. As a result of experimental data processing, it was found that the flexural strength rate decreases to zero on the 12-14th day hardening of mortars, which can be explained by the end of the formation of macroporosity (voids) of the cement paste and the end of the chemical-physical processes of the formation of most contacts between the cement paste and the aggregate (sand grains).
Spectrum analysis of optical signals using sequential heterodyning
Authors: Moskaletz O D , Vaganov M A , Suedov E P 
Published: May 2020

Abstract
The possibility of transferring the idea of radio-frequency sequential heterodyne spectrum analysis to the optical range is considered. The question of a panoramic optical local oscillator in the form of a tunable laser is considered, where the consideration of stochastic phenomena is presented in the form of the sum of oscillations with a linear change in the instantaneous frequency and the stochastic component as interference. In this regard, it is proposed to use the technique of compression of radar signals to reduce the influence of the stochastic component of the oscillations of the laser panoramic local oscillator.
Asymptotic method for predicting the resonance during the descent of an asymmetric probe in the Martian atmosphere
Authors: Lyubimov V V 
Published: May 2020

Abstract
This work is devoted to the study of the uncontrolled descent of a probe with small asymmetries in the atmosphere of Mars. The aim of the work is to formulate a method for predicting the principal resonance in the problem of the descent of a space probe with small geometric and aerodynamic asymmetries in the atmosphere of Mars. The noted resonance is observed in the case of a long-term coincidence of two characteristic frequencies of a nonlinear system of equations simulating the motion of the probe relative to the center of mass. The applying of the averaging method makes it possible to analyze non-resonant evolutions in the angular velocity and spatial angle of attack caused by the influence of the principal resonance. Presented resonance prediction method can find application in a whole class of problems of modern astronautics.
Analysis of frequency characteristics of a structure with single modal reservation before and after failure
Authors: Medvedev A V , Zhechev Y S 
Published: May 2020

Abstract
The paper considers reservation structure implemented by using modal filtering. Such reservation is called modal reservation (MR) for short. To ensure certainty, we took a PCB layout with a single MR. It is shown that in quasi-static simulation, for the structure with losses in conductors and dielectrics, the cut-off frequency for an OC and an SC at one end of the passive conductor is 5.5 and 1.6 %, respectively, lower than for the circuit in operating condition, and the resonance frequencies are 8 and 11.6 %, respectively, lower. In electrodynamic simulation, for the conductor-loss structure and dielectrics, the cut-off frequency for an OC and an SC at one end of the passive conductor is 1.3 and 2.7 %, respectively, lower than for the circuit in operating condition, and the resonance frequencies are 7.3 and 10.65 % lower. The differences of resonance frequencies (f
0), cut-off frequencies (f
cu) in quasi-static and electrodynamic simulations are no more than 5.66 and 1.6 %, respectively.
Temperature influence on dynamic behavior of spacecraft waveguides
Authors: Kudryavtsev I V , Brungardt M V , Troshin S I , Kolotov A V , Mityaev A E 
Published: May 2020

Abstract
The lowest eigenfrequency and critical force are important parameters which defines structure behavior under dynamic loading. The paper describes the influence of temperature on the lowest eigenfrequency and critical force of a waveguide straight section in the spacecraft. The straight waveguide modeled according to the beam theory. It has been shown that the temperature change is equivalent an appearance and action of the axial force which makes the structure prestressed and significantly modifies its lowest eigenfrequency. An example of calculation of dependence of the waveguide straight section lowest eigenfrequency on temperature was considered, and it showed the existence of a critical temperature value, where the vibration frequency equals to zero. This critical temperature value corresponds to the loss of waveguide structure stability which is extremely undesirable and requires special methods to avoid such a situation. Stress state of waveguide in case of its loss of stability is also estimated.
Assessment of cyclic crack resistance of surface hardened parts
Authors: Kravchenko G N , Kravchenko K G 
Published: May 2020

Abstract
Calculation and experimental methods for evaluating the cyclic crack resistance of materials and plain workpieces after hardening their surface layer by various technological processes are presented and argued. These methods can be used in engineering calculations to determine and designate the most effective processes for surface hardening of parts from high-strength materials and to optimize process parameters.
Conceptual functional design of hybrid energy source of unmanned convertiplane
Authors: Nabiyev R N , Hazarkhanov A T , Garayev G I , Abdullayev A A 
Published: May 2020

AbstractConvertiplane is explored in this article as an unmanned aerial vehicle incorporating hybrid power sources and hybrid propulsion systems. Based on the use of an electric generator in conjunction with a battery, fuel element and internal combustion engine as a source of energy in the non-manifold electrical engine convertiplanes, hybrid power sources and hybrid propulsion systems manufacturing specifications, as well as providing convertiplane with a long-term flight issues are considered hereby. In order to provide selection of the optimal design, hybrid energy source models from connection designs of different types of energy sources have been analyzed. Structural schemes of power systems with different configurations consisting of “sequential”, “parallel” and “mixed” connections of hybrid energy sources and hybrid propulsion systems have been analyzed and optimal connection schemes have been determined on their basis. It has been shown that when using four hybrid winged-motor group, the lifting system becomes complicated, the weight of the convertiplane is becoming relatively heavy. For an airplane weighing 15-20 kg, it is recommended to use four electric motors as a lifting engine, an internal combustion engine as a driving motor and an electric generator to charge the battery during the flight in order to ensure vertical flight, endurance or hovering at the height. A conceptual block diagram of a convertiplane type unmanned aerial vehicle is developed.
Physical and mechanical properties of materials of life vests for people with disabilities
Authors: Grigorieva Z R , Solodushenkova T S , Budeeva O N 
Published: May 2020

Abstract
The main requirements for life vests (buoyancy, durability, light weight, resistance to sea water and petrochemicals etc.) are met due to the right choice of materials for the outer parts of the articles. The current article presents some findings of the research into the main physical and mechanical properties of materials for outer parts of life vests designed for physically challenged people. On the basis of the research the authors have grounded the selection of materials to meet the requirements of the existing regulatory and technical documentation for the production of textiles of the relevant range.
Features of microscopic and macroscopic analysis of 35HGSL steel
Authors: Skryabin M L , Kuklin S M 
Published: May 2020

Abstract
Foundry steels are widely used in modern engineering today. But it is foundry steels that have the greatest number of defects, which can be detected by macro-and microanalysis. In addition, with the help of these studies, you can get an idea about the General structure of the metal and the presence of certain specific defects in it – stone-like and naphthalene fractures. Using microanalysis methods, it is also possible to evaluate the properties of multiphase alloys and cast iron, for which there are special scales that classify graphite and phosphide eutectic by shape and quantity. The article describes the features of conducting these studies using optical microscopy.
The study of magnetic resistance on thin single-crystal nickel films
Authors: Urinov Kh O , Amonov A K , Makhmudov F Dj , Urinova Z Kh , Shermatov B N 
Published: May 2020

Abstract
In this work the anisotropy of the transverse magnetoresistance of single-crystal nickel films was studied. The measurements were carried out on samples whose surface plane coincided with the [001] plane. Studies of magnetoresistance in a single-crystal nickel film showed the influence of tensile stresses acting on it from the side of magnesium oxide. The modification of the anisotropy of the magnetoconductivity of the film on the substrate as compared with the free sample is apparently associated with a change in the shape of the Fermi surface of the carriers.
Monitoring the technical and technological state of electric power complex facilities
Authors: Gibadullin A A , Erygin Yu V , Polyakov A E , Pobyvaev S A 
Published: May 2020

Abstract
The presented study is devoted to monitoring the technical and technological state of electric power complex facilities. As part of the study, the basic principles of monitoring and examining the state of equipment were analyzed, the process and procedure for monitoring the status of equipment and structures of the electric power complex were examined. The work analyzed the periods of preparation for the heating season of the Russian electric power industry, as a result of which it was revealed that the number of violations at electric power facilities was increasing, and the equipment of the federal districts was not fully prepared for the heating season by the readiness index. The work revealed that for almost all indicators of heat supply, water supply and sanitation, the number of violations and incidents during the heating period is increasing. At the end of the study, measures were presented that will ensure the stability and reliability of energy supply to consumers.
The effect of femtosecond laser treatment on the tribological properties of titanium nitride
Authors: Gazizova M Yu , Smirnov N A , Kudrayshov S I , Shugurov V V 
Published: May 2020

Abstract
The influence of femtosecond laser (fs-laser) processing on the structural-phase state of titanium nitride (TiN) coatings have been studied. It has been revealed using scanning electron microscopy and scanning probe microscopy that laser-induced periodic surface structures (LIPSS, LSFL) form on TiN coating surfaces. Depending on the laser scanning direction, two types of surface structures - parallel and cross-like ones have been obtained. Tribological tests showed that cross-like structures demonstrates better wear resistance properties in a dry friction, while parallel ones in a friction with lubricants.
Information and computing maintenance for the regional satellite operational monitoring system
Authors: Yakubailik O E , Pavlichenko E A , Romas’ko V Y 
Published: May 2020

AbstractThe article discusses the experience of supporting a regional operational satellite monitoring system. Based on NASA IOPP free & open source software, a set of programs has been created to automate the reception and automated processing of incoming satellite information. The development is primarily focused on data coming from the satellite receiving station, however, it also deals with the interpretation of data received via the Internet. A three-stage scheme of distributed processing and data conversion is implemented. The output goes to the local satellite data storage. A collection of specialized multi-channel raster images is also being formed for quick visualization of images in a geographic information web system. The current version of the system performs processing from eight different sensors installed on several satellites.
Residual stresses in Ti6Al4V alloy after surface texturing by femtosecond laser pulses
Authors: Zhidkov M V , Smirnov N A , Chen J , Kudryashov S I , Goncharov I Y 
Published: May 2020

Abstract
Surface topography and residual stresses in surface layers of α + β titanium alloy Ti6Al4V textured by 1030-nm, 320-fs-laser pulses were studied by scanning electron microscopy and X-ray diffraction analysis. It was found that multipulse laser processing leads to the formation of laser-induced periodic surface structures (LIPSS) on the surface of Ti6Al4V alloy. XRD studies showed that depending on the laser pulse fluence, both tensile and compressive residual stresses are formed in thin near-surface layers.
Simulation and histogram modeling of conveyor systems
Authors: Guzha E D , Romanenko V A , Skorokhod M A 
Published: May 2020

Abstract
Using the example of transport conveyor systems, an approach that reduces the cost of resources and time for the development and application of a computer simulation model during the design of the system, which provides a combination of simulation with the method of histogram calculations, which is one of the numerical methods for working with random variables, is proposed. The approach involves replacing a unified simulation model of a system with a complex of submodels of its components, accumulating intermediate results on the basis of submodels and subsequent histogram processing of these results in order to determine the probabilistic characteristics and performance indicators of the system. An example of a histogram simulation of an airport baggage handling system is presented.