bluuebunny/crossref_metadata_2025_split huggingface dataset:
Developing learning media for power plant course
Authors: Surwi F , Yuniarti N , Zamtinah  
Published: June 2019

Abstract
This study aims to (1) develop an appropriate learning media for Power Plant Course, and (2) assess the feasibility of the developed learning media. This is a research and development study using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). The research object was the Power Plant Course and the subjects were 30 students of Electrical Engineering Education Department, Faculty of Engineering, Yogyakarta State University. The data were collected by means of questionnaires on a 4-point Likert-type scale. This instrument was validated through expert judgement with the Delphi technique. The obtained data were then analyzed using qualitative descriptive technique. The final product of this research and development study was a learning media used in the Power Plant Course. The results of the feasibility test by the material and media experts as well as by the end users indicate that the developed media is “highly feasible” as the obtained mean scores are 3.41, 3.53, and 3.62 respectively.
The basics of preparation technology of titanium triboengineering oxide coatings and their tests
Authors: Bolotov A N , Novikov V V , Novikova O O 
Published: June 2019

Abstract
The paper describes the developed basics of the preparation technology of solid ceramic coatings on titanium and its alloys. The coatings have been formed by the method of microplasma surface oxidation in electrolytes of different composition. The authors have determined the modes of wear-resistant coating application on titanium alloy, which have significantly decreased coating porosity and made it possible to increase its wear resistance. They have also carried out physical and mechanical, as well as tribological tests of the materials obtained and formed a database of their actual properties. The paper shows that self-lubricating coatings can be operated for a long time at moderate loads and sliding speeds in friction units without using a lubricant. It also describes a newly developed and improved existing equipment to create coatings and study their tribological properties.
The effect of plasticization on the functional properties of thermoplastic polyurethane ureas
Authors: Senichev V Yu , Makarova M A , Savchuk A V , Slobodinyuk A I , Oshchepkova T E 
Published: June 2019

Abstract
Several series of plasticized segmented polyether urethane of linear structure which can be used as the polymer base of thermoplastic materials were synthesized. The possibility of obtaining thermoplastic segmented polyurethane ureas with a softening temperature of 100 ÷120°C when using isophorone diisocyanate as the main element for building polymer chains, and DEHS as a plasticizer was proven. The original method for the purification of aromatic amine 4,4′-methylene-bis(2-chloroaniline) used in the process of synthesizing polyurethane ureas as a chain extender was developed. The polymers obtained have a uniquely low glass transition temperature close to -100°C with a plasticizer concentration of not more than 40%. The strength of these materials is more than 10 MPa at room temperature, and it is more 40 MPa at -70°C.
Energy equations for the temperature three-dimensional boundary layer for the flow within boundary conditions of turbo machinery
Authors: Zuev A A , Kishkin A A , Zhuikov D A , Tolstopyatov M I , Savelyeva M V 
Published: June 2019

Abstract
The research generates an integral relation of the energy equations for the temperature three-dimensional boundary layer allowing to integrate surfaces of any shape to determine thickness of energy loss. An equation to determine thickness of energy loss is necessary to specify heat transfer law and local heat transfer coefficients within boundary conditions of turbo machinery cavities.
Electrical conductivity modelling of polypropylene composites with carbon fillers
Authors: Stepashkina A S , Chizhkova E A , Mishura T P , Tselms R N 
Published: June 2019

Abstract
Samples of a composite material based on polypropylene matrix and carbon fillers (carbon black and carbon nanofibers) were obtained. It was experimentally shown that the dependences of the electrical conductivity on the filler mass fraction have a threshold nature/When the mass fraction of the filler is higher than the threshold the values of the electrical conductivity increases by more than 8-10 orders. Determination of the electrical conductivity value near the percolation threshold is difficult. In the article the simulation method was proposed which considers the presence of a dielectric layer between the filler particles, presented a method for its evaluation: the percolation curve near the percolation threshold was described. A fairly good agreement between the experimental and theoretical values of conductivity for various geometries and types of fillers is shown in this work.
Mechanical properties of new functional composite materials based on polymeric binders
Authors: Sulaberidze V Sh , Mushenko V D , Mikheev V A , Skorniakova E A 
Published: June 2019

AbstractComposite materials which include components (binding and fillers) that provide technological and operational characteristics were investigated. As a fillers AlN, Al(OH)3, SiO2, CaSi03powders are used. Binder – dimethylsiloxane rubber SKTN A + PMS silicone oil in 4:1 proportion. Studied composite materials are designed for dielectric coatings materials creation, which have a high thermal conductivity and do not support combustion (through the use of fillers with flame retardant properties). The results of experimental studies of the mechanical characteristics of composite materials based on siloxane binder and fillers in the form of fine powders AlN, Al(OH)3, SiO2, CaSi03are presented. The values of strength, coefficient of elasticity, relative elongation in tensile tests, modulus of elasticity in compression tests, Shore hardness are measured.
Study of the stability of dispersed systems based on polyaluminosilicates for 3D aerosol printing of ceramic layers of printed circuit boards
Authors: Ivanov A A , Polyushko V A , Khomyakov A Yu. 
Published: June 2019

Abstract
A composite material based on polyaluminosilicate and highly dispersed filler powders of AlN and Al2O3 has been synthesized by means of the sol-gel synthesis. The pH effect on the Zeta potential of highly dispersed filler powders of AlN and Al2O3 has been investigated. The effect of the Zeta potential of filler powders on the sol polyaluminosilicate stability has been studied. Ceramic coatings for printed circuit boards have been obtained by 3D aerosol printing.
Working position with recomposed production systems: devices
Authors: Bobrovskij Sergej , Gorshkov Boris , Zaides Semen , Fedorov Sergey , Zibrov Petr , Drachev Oleg , Khaimovich Alexander 
Published: June 2019

Abstract
The article presents the current trends in the recomposed work stand and the terminology used. Technical solutions were considered in order to optimize the use of this system type. Intermodular element of locating and fixing - multi-tiered was proposed. This device contains automatic plug-in units, layout - multi-tiered. Tiered layout does not always meet the requirements of the technical process. Industrial robot for automatic replacement of nodes was proposed.
Studying rigidity of the welded liner - composite shell construction
Authors: Egorov Anton V 
Published: June 2019

Abstract
The mechanical behaviour of an aluminium welded liner in a cylindrical metal composite vessel of high pressure made by winding on a linear carbon-filled plastic tape with tension is investigated. The resulting pressure of the wound composite shell on the welded liner is simulated by cooling the shell. It is believed that the weld is obtained by friction welding and has characteristics that are reduced in relation to the base material of the liner. The problem is solved in a geometrically and physically nonlinear formulation using a 3D solid element model, taking into account technological deviations and in real (current) time. The calculations were performed in the LS-DYNA software package in a dynamic formulation. It is shown that liner delamination from the sheath starts from the side of the circumferential weld in the area of technological deviations.
Method for determining the direction to the interference source without use of additional antennas
Authors: Kartsan I N , Malanina Yu N , Zhukov A O , Klimenko A V , Tsarev R Y 
Published: June 2019

Abstract
A method for determining the direction to the source of interference without the use of additional antennas is proposed. It provides interference suppression in the direction of the side lobes of the radiation pattern due to additional synthesis of the antenna pattern for the central beams without complicating the calculation algorithm and without using additional antennas.
Recursive clustering algorithm based on silhouette criterion maximization for sorting semiconductor devices by homogeneous batches
Authors: Golovanov S M , Orlov V I , Kazakovtsev L A , Popov A M 
Published: June 2019

Abstract
We propose a recursive algorithm for dividing a presumably mixed production batch of semiconductor devices into homogeneous groups (clusters) with the use of data of non-destructive testing, based on the maximization of the silhouette criterion in the sequential solving of the k-Means clustering problems. Based on the silhouette criterion, we formulate the concept of homogeneity of a production batch. The application of the developed algorithm to the problem of formation of homogeneous production batches of integrated circuits for space industry is illustrated with a computational example.
Development of technologies for the production of multi-component ligatures Al-Cu-B-C with high thermal characteristics
Authors: Bazhin V Yu , Alattar A L , Danilov I V 
Published: June 2019

Abstract
The purpose of research is to provide a competitive alternative to aluminum silicon alloys used in automotive applications. This alternate can be created by developing composites of Al-5%Cu alloy reinforced with B4C particulates with a low coefficient of thermal expansion. Stir casting can be used to produce Al-5%Cu alloys containing different ratios of B4C. The squeeze casting technique decreased the porosity of the final material. The composites exhibited a fairly uniform particle distribution throughout the alloy matrix.
Modelling the process of interaction of porous titanium adsorbent with a multi -component gas environment
Authors: Bataronov I L , Selivanov V F , Peshkov V V , Semenozhenkov M V , Korchagin I B 
Published: June 2019

Abstract
A model of mass transfer of two-component gas through an absorbing porous body was developed. The mathematical model is a problem of Stefan problem type. Analytical solutions of the model in the quasi-stationary regime were obtained. For the transfer of nitrogen-oxygen mixture by titanium porous adsorbent, the dependences of the gas penetration depth and the mass absorbed by the adsorbent on the temperature, the pressure of the gas mixture and the diameter of the porous material particles were calculated. It was found that the size of the nitrogen absorption area was several times smaller than the size of the oxygen absorption area. Also, the mass of the absorbed nitrogen was half the mass of the absorbed oxygen. This is due to the remoteness of the nitrogen absorption area from the outer surface of the titanium adsorbent.
The task of determining the actual routes in the traffic control system using satellite navigation
Authors: Fadeev A I 
Published: June 2019

Abstract
The paper deals with the task of determining the actual traffic routes based on the data of the global satellite navigation system during the dispatching control of road transport. The actual route through the transport network is an ordered set of traffic control points passed. The fixation of control points of the route in the processing of satellite navigation data is carried out by means of two radii: the radius of detection and the radius of positioning. The paper proposes a method for processing satellite navigation data, consisting of two stages: first, pre-processing and, second, calculating the parameters of the system states defined by the dispatch control tasks. The state of the system controlled by the traffic dispatcher system is described.
Wear resistance of composite electrochemical coatings containing polyepoxides
Authors: Kisel J E , Guryanovl G V , Kaminin V V 
Published: June 2019

Abstract
The expediency of polymer-metal coatings reinforced with polyepoxides use for increasing the wear resistance of machine parts is described. The composition and structure of composite coatings providing the highest wear resistance are presented in an optimized way.
Rolling contact fatigue of hot-deformed powder steels with calcium microadditives
Authors: Dorofeyev V Y , Sviridova A N , Berezhnoy Y M , Bessarabov E N , Kochkarova K S , Tamadaev V G 
Published: June 2019

Abstract
Fatigue damage of the surface layers of metal is a characteristic cause of failure of rolling bearings, gears and a number of other machine parts operating under cyclically repeated contact loads. Resistivity to the development of contact damage of steels obtained by hot forging porous blanks is determined by the presence of cohesive bonds between the particles of the base powder, as well as by the presence of non-metallic inclusions and grain size. The possibility of increasing the contact endurance of hot-deformed powder steels due to micro-doping with calcium has been studied. Iron powders with various content of impurities, as well as atomized powder of low-alloyed chromium-molybdenum steel were used as the basis for preparation of the blends. Calcium was doped as calcium carbonate. Mixing was performed in a planetary centrifugal mill. Samples for mechanical testing were obtained by hot forging porous blanks. After hot forging the samples were carburized to compensate for the loss of carbon in the surface layer. It has been established that doping calcium microadditives is favourable for increasing the energy content of damage under the conditions of exposure to contact-fatigue and bending loads. This is due to a decrease in the size of austenite grains at the expense of inhibition of their growth during the adsorption of calcium at the grain boundaries. Microalloying with calcium changes the localization of seats of contact fatigue damage. In samples-witnesses without microadditives of calcium cracks originate near non-metallic inclusions of sharp-angled shape in the near-surface zone. In microalloyed specimens the cracks are located in the subsurface layer in the area of Hertz maximum shear stresses.
Monopulse lidar Earth surface sounding method
Authors: Belov M L , Belov A M , Gorodnichev V A , Alkov S V 
Published: June 2019

Abstract
The paper studies the monopulse lidar method capabilities for sounding the reflection coefficient of the earth surface. The mathematical modelling shows that the monopulse lidar method allows us to reconstruct spatial distribution of the reflection coefficient under measurement noise in a good-sized angular coverage of lidar. The most efficient for reconstruction of the reflection coefficients based on the measurement data (in terms of both the minimum errors and the computation time) are the hybrid particle swarm algorithm and simulated annealing and the ant colony algorithm. The monopulse lidar monitoring method using the hybrid particle swarm algorithm and simulated annealing and the ant colony algorithm allows (with an error of estimating expansion coefficients from units of per cent to 10 - 40% under measurement noise of 3%) adequate reconstruction of spatial distribution of the reflection coefficient on the earth surface under conditions of strongly and nonlinearly changeable reflection coefficient.
Engineering method for assessing the strength of reinforced concrete beams
Authors: Snezhkina O V 
Published: June 2019

Abstract
A calculation method is proposed that combines two existing methods for calculating the strength of reinforced concrete beams. The author of the article considers the possibility of presenting the work of a reinforced concrete beam in the form of an arch with a curvilinear shape with a puff, which is a statically definable system. The operation of a reinforced concrete beam with a relative span of a slice from 1 to 3 is modeled as an arched system with a horizontal stretched reinforcing belt and a compressed concrete strip of curvilinear shape. The purpose of the tightening in a beam with an average relative cut span is to cancel the bending moment inherent in a simple beam. Thus, this model (arch with tightening) most fully reflects the work of reinforced concrete beams with an average relative cut span compared to the model adopted in regulatory documents.
Parallel implementation of the greedy heuristic clustering algorithms
Authors: Kazakovtsev L A , Rozhnov I P , Popov E A , Karaseva M V , Stupina A A 
Published: June 2019

Abstract
Authors propose parallel greedy heuristic k-means clustering algorithms for implementation on the graphical processing units (GPU) for solving large-scale problems. The computational experiments illustrate high performance of the GPUs in comparison with running the greedy heuristic algorithms on a central processor unit which is especially significant in the case of big datasets and bug numbers of clusters. The efficiency of the greedy heuristic algorithms in comparison with the standard k-means algorithm remains.
The comparison of several approaches to the interpolation of a trajectory of a navigation satellite
Authors: Karepova E D , Kornienko V S 
Published: June 2019

Abstract
Since a satellite orbit is quite smooth, polynomial techniques can be widely used for the interpolation of satellite positions in real-time applications. The paper is devoted to the comparison of different approaches to the polynomial interpolation of the trajectory of a satellite using available data. All approaches have been examined for test and actual data.
Atomic structure and electronic properties of binary graphane: Ab initio calculations
Authors: Greshnyakov V A , Belenkov E A 
Published: June 2019

Abstract
In this work, ab initio studies of a novel two-dimensional diamond-like nanostructure consisting of two polymerized graphenes are carried out. This nanostructure called binary graphane has a two-dimensional hexagonal lattice with the parameter a = 0.2737 nm. The surface density, cohesive energy and indirect band gap of binary graphane are 0.123 μg/cm2, 6.64 eV/atom and 2.83 eV, respectively. It is also established that this layer must be stable up to 200 K.
The effect of titanium dioxide coated carbon fibers on the aluminum alloy matrix composite strength
Authors: Gomzin A I , Gallyamova R F , Galyshev S N , Paramonov R M , Zaripov N G , Musin F F 
Published: June 2019

Abstract
In this work the possibility of using TiO2 coating as a barrier between carbon fiber and an aluminum matrix in a Cf/Al composite was studied. Specimens of a composite with a matrix of Al-6Mg alloy were obtained by the method of liquid-phase infiltration under pressure. As a reinforcing component was used continuous uncoated and titanium dioxide coated carbon fibers. TiO2 coating on carbon fiber preform were prepared by sol–gel method. The protective properties of the coating and the mechanical properties of the composite at three-point bending were evaluated. Microstructural and fractographic analyzes were performed. It was established that the barrier coating made it possible to increase the strength of the composite more than 2.5 times from 250 MPa to 660 MPa.
The study of the aircraft functional appearance design
Authors: Khakimov A V , Nechaev V A , Kostishin M O , Zharinov O O 
Published: June 2019

Abstract
The paper investigated the technical specification as the main document describing the major functions performed by the aircraft. The functional appearance of the on-board equipment complex is revealed in the first approximation. A range of tasks related only to solving problems of navigation and aircraft control is highlighted. The possibility of decomposition of functions depending on their degree of complexity is presented. The process of selecting existing systems to perform the required functions is investigated. The possibility of automating the process of designing a functional appearance based on existing systems is described. The system selection process has been formalized to enable the use of computer-aided design systems in order to shorten the design of the functional appearance of the upper level and minimize the functional inadequacy or redundancy of the complex.
Resonance of electrical circuit with periodical time-variable element
Authors: Biryuk N D , Krivtsov A Yu 
Published: June 2019

Abstract
Resonance theory of usual oscillatory circuit is expanded in case of time-variable circuit of general aspect, in which all elements change with time in accordance with continuous periodical functions of the same period. There exists potential possibility of dissemination it to nonlinear circuit by means of principle of linear introduction.
The results of water droplet erosion tests of ion-plasma coatings formed on titanium Ti-6Al-4V alloy samples manufactured by using 3D-printing and traditional technological process
Authors: Mednikov Alexey F , Tkhabisimov Alexander B , Zilova Olga S , Burmistrov Andrey A , Sidorov Sergey V 
Published: June 2019

Abstract
The paper presents the results of erosion tests and metallographic studies of titanium alloy samples manufactured by using 3D printing and traditional technological methods without coatings and with various types of ion-plasma coatings. As a result of the tests, the kinetic curves of erosion wear of the studied alloys and coatings were obtained, showing that the best type among those considered is a DLC (Diamond Like Carbon) coating, which increases the relative erosion resistance of uncoated samples in incubation period duration of the water droplet erosion process by not less than in 1.8 times.
Material evaporation with ultrashort laser exposure
Authors: Latypov I I , Bigaeva L A , Chudinov V V , Gilev A Y , Gaisin F R 
Published: June 2019

Abstract
The task is to analyse the temperature distribution in the material under ultrashort laser irradiation. The mathematical model is built on the basis of a two-temperature model describing transition phenomena in a nonequilibrium electron gas and lattice with an ultrashort laser effect on the material. The vaporized body is considered as a thin plate and the problem is formulated as a system of one-dimensional boundary-value problems of the heat equation written for the electron and lattice components. The initial problem is reduced to solving a system of singularly perturbed boundary problems of the heat equation with nonlinear boundary conditions on moving boundaries, an approximate solution of which is obtained in the form of an asymptotic expansion of the solution in the Poincaré sense in powers of small parameters.
Automated testing and fault diagnosis of the microcontroller system
Authors: Pankov D A , Denisova L A 
Published: June 2019

Abstract
The article deals with the problem systems automated testing of microcontrollers. A system architecture proposed for fault diagnosis and determining the consequences of device failures. Highlighted separately intermittent failure. The issue of integrating software and hardware failure simulation tools into the testing architecture investigated. Model studies of the testing system performed and conducted diagnostics of simulated faults. The efficiency technology of automated testing confirmed with simulation known failures types (injection) for the components of the performed microcontroller device is proposed.