bluuebunny/crossref_metadata_2025 huggingface dataset:
Silver nanocomposites based on copolymers of N,N-diallyl-N’-acylhydrazines with N-vinylpyrrolidone
Authors: Gorbunova M , Batueva T
Published: May 2020

New nanocomposites based on Ag and copolymers of N-vinylpyrrolidone with N, N-diallyl-N’-acetylhydrazine [poly(VP-DAAH)], N, N-diallyl-N’-butanoylhydrazine [poly(VP-DABH)] and N, N-diallyl-N’-benzoylhydrazine [poly(VP-DABEH)] have been developed. The average silver particle size ranged from 10 to 20 nm for poly(VP-DAAH), from 13 to 21 nm for poly(VP-DABEH) and from 30 to 42 nm for poly(VP-DABH), with the corresponding UV-vis absorption peak position at 400-410 nm. New nanocomposites based on copolymers of N, N-diallyl-N’-acylhydrazines have cytotoxic activity against rhabdomyosarcoma RD and melanoma MS. This effect is comparable to the activity of camptothecin, an alkaloid with high antitumor activity.
The electrochemical synthesis and investigation of nanostructured Fe-Pt and Co-Pt systems
Authors: Ivanova N , Lobanov A , Andyyakova A , Zakharov Yu , Popova A , Kolmykov R
Published: May 2020

By means cyclic and anodic linear sweep/stripping voltammetry methods the electrochemical behavior of bimetallic electrolytic nanoalloys and nanostructured powders Fe–Pt, Co–Pt was investigated in acidic (chloride, sulfate, tartrate) and ammonia buffer media with the glassy carbon electrode. The conditions (supporting electrolytes, concentrations of metal ions, voltammetric parameters) of the electrochemical synthesis and voltammetric characterization of the binary systems were established.
The investigation of the welded joints of the nitrogen containing cast austenitic steel, obtained by the manual arc welding
Authors: Kostina V S , Kostina M V , Sharapov M G , Samodurov I O , Muradyan S O
Published: May 2020

A literature analysis showed, that in the world there are not the welding additives, which is contain in own composition more than 0, 37% mass. N. The investigations of the welding joints of the austenitic cast steel 05Kh21AG15N8MFL with the nitrogen containing 0, 57% mass with using the available welding additives was provided. The technology of TIG welding with using two industrial welding wires Sv-10Kh20N18M3AFS (0, 24% N) and Sv-25Kh25N16AG7 (0, 10% N) was developed. It was obtain the defect-free welding joints, having a high rate of the mechanical properties, resistance to the pitting corrosion in 3, 5% NaCl, containing up to 0, 4% ferrite.
Effect of evaporating additive on sintering and properties ceramics based on magnesium aluminate spinel
Authors: Kozlovskaya E A , Kseneva D S , Senina M O , Lemeshev D O
Published: May 2020

Annotation

Prospects of appliance of transparent ceramic based on magnesium aluminate spinel are considered. Sintering additive that makes it possible to synthesise transparent ceramic material from spinel was selected. Influence of evaporating additive B2O3 on properties ceramics based on magnesium aluminate spinel is shown.
Preparation and characterization of stable water soluble hybrid nanostructures of hydrophobic compounds by encapsulation into nanoparticles of amphiphilic N-vinylpyrrolidone copolymers of new generation
Authors: Kurmaz S V , Konev D V , Sen’ V D , Kurmaz V A , Kulikov A V
Published: May 2020

The conditions for obtaining stable aqueous solutions of prospective pharmaceutical: a lipophilic aminonitroxyl platinum complex, namely, e-amine-d-(4-amino-2, 2, 6, 6-tetramethylpiperidine 1-oxyl)-a, fbis(octanoato)-b, c-dichloroplatinum(IV) (PNC), and a dye zinc tetraphenylporphyrinate (ZnTPP) by means of their solubilization with polymer particles of N-vinylpyrrolidone with dimethacrylate. Aqueous solutions of PNC and ZnTPP encapsulated into polymer particles were investigated by dynamic light scattering, and the temperature dependence of nanostructure sizes was studied. According to transmission electron microscopy, the hybrid nanostructures are core—shell particles, in which the PtIV complex forms small clusters (∼4 nm). It was established by ESR and voltammetric measurements that the free radical fragment of the aminonitroxyl PtIV complex kept its mobility and the same ESR and redox characteristics as the 4-acetylamino-2, 2, 6, 6-tetramethylpiperidine 1-oxyl radical. The obtained results indicate that biocompatible copolymers of N-vinylpyrrolidone are of interests as carriers and delivery tools for ZnTPP and organic PtIV complexes. Hybrid structures of given dimensions and properties can be created on their basis necessary for biomedical applications.
Determination of phase transition temperatures (melting, crystallization, rotator phases) of n-alkanes by the optical method
Authors: Kuryakov V N , Ivanova D D , Tkachenko A N , Sedenkov P N
Published: May 2020

The temperatures of phase transitions (melting, crystallization, rotator phases) were determined for a number of individual n-alkanes from C19H40 (n-nonadecane) to C28H58 (n-octacosane) by the optical method, a modified droplet technique. For this research, n-alkanes were presented as an emulsion in water without the addition of surfactants. Emulsions were prepared by ultrasonic dispersion of a small amount of n-alkane in water at a temperature above the melting point of the investigated n-alkane. The hydrodynamic radius of the dispersions measured by the dynamic light scattering (DLS) method was about 100 nm and did not change within a wide temperature range within the measurement accuracy. The temperatures of melting, crystallization, and rotator phase transitions of pure n-alkanes in the form of emulsion were determined from temperature-dependent measurements of the light scattering by the dispersions. The supercooling values for studied n-alkanes were also determined.
Effect of ions concentration in buffer solutions on the nucleation of hydroxyapatite surface on the octacalcium phosphate granules
Authors: Mikheeva P V , Yu Teterina A , Smirnov I V , Yu Fedotov A , Komlev V S
Published: May 2020

Octacalcium phosphate granules were subsequently immersed for different lengths of time from 1 day to 44 days at constant temperature 37±0.4°C in solutions, simulating the extracellular body fluids: Supersaturated Calcification Solution (SCS), Simulated Body Fluid (SBF), based on the ISO-10993 “Biological Evaluation of Medical Devices” standard. The role of buffer`s systems pH-value, time of the material exposure and calcium and phosphorus ionic concentrations were analysed with the main focus on kinetics of degradation, changes in the morphological characteristics and phase composition of octacalcium phosphate samples.
Reactive hot-pressed LaB6-W2B5 ceramics
Authors: Nesmelov D D , Novoselov E S , Titov D D , Ordan’yan S S , Perevislov S N
Published: May 2020

The heterophase LaB6-W2B5 composite with LaB6 content of 50 vol. % was fabricated by reactive hot pressing of the powder mixture of LaB6, W and amorphous boron at 1800 °C and 30 MPa for 15 min. The structure and phase composition of the synthesis products were analyzed by SEM, EDX and XRD methods. The effect of the pressure-induced anisotropic W2B5 grains growth was observed. The elastic modulus of composites investigated by resonance frequency method, and the Vickers hardness via indentation method.
Thermal conductivity of SiC-B4C materials obtained by reaction-sintering method
Authors: Perevislov S N , Motaylo E S , Novoselov E S , Nesmelov D D
Published: May 2020

In this research, temperature dependences of the thermal conductivity of reaction-bonded SiC – B4C composite materials at the temperature range of 293 – 1400 K were investigated. The effect of B4C concentration on thermal conductivity is shown. The thermal conductivity of SiC – B4C materials were compared with the thermal conductivity of materials based on silicon carbide and boron carbide obtained by different methods.
Advantages of drawing and rolling metals with pulse current
Authors: Troitsky O A , Stashenko V I
Published: May 2020

The results of studies on the drawing of copper and steel wires using pulsed current in the deformation zone are presented. The analysis of their structure and physicomechanical properties is given. As a result, the drawing forces of copper and steel wires are reduced by 30-35%, the electrical resistance is reduced by 18-20%, a more perfect axial texture appears, the ductility of the wires increases compared to warm drawing. In the steel wire, the α-phase content sharply decreases, which is predominantly released in the surface layer by several microns. We propose methods for the modernization of rolling equipment for technology using pulsed current. The efficiency of using a high-density pulsed current on a rolling mill for producing stainless steel from an initial billet of 2 mm thick and 100 mm wide 0.3 mm thick tape without intermediate annealing and oxide film is shown.
Novel materials for high-resolution three-dimensional printing using surface-selective laser sintering
Authors: Syachina M , Minaeva S , Krumins E , Howdle S , Popov V
Published: May 2020

A new approach for high-resolution three-dimensional printing using selective laser sintering is proposed. Novel ultrafine powder is synthesized and modified to face the requirements of the laser sintering process. The effect of the powder particle size and shape on the characteristics of the sintered structures is studied.
Reducing of holes effect on composite elements strength
Authors: Kh Akhmedshin E , Polilov A N , Tatus N A
Published: May 2020

Reducing the effect of holes on the attachment points of composite elements is one of the key tasks from the time the composites appeared to the present. Since the composite material and the structure are inseparable, it is necessary to design the joints at the stage of manufacturing the structural element. The work is devoted to the experimental assessment of the effect of holes made by various technologies on the strength of composite specimen. A significant increase in the bearing capacity of composite flat specimen, holes in which are made by the separation of the fibers during the manufacturing. For fiberglass, the bearing capacity of a specimen with a drilled hole decreased by 4 times, and the specimen with fibers “flowing around” the hole by only 25% compared to a solid flat specimen.
Phosphors based on Ce:(Pb,Gd)3(Al,Ga)5O12 epitaxial films: synthesis, optical properties, application
Authors: Vasil’ev D A , Spassky D A , Plotnichenko V G , Voronov V V , Khakhalin A V , Galstyan A M , Vasil’eva N V
Published: May 2020

Ce-doped (Pb, Gd)3(Al, Ga)5O12 single crystalline garnet films were grown using liquid-phase epitaxy method from supercooled PbO–B2O3-based melt solutions on substrates from Gd3Ga5O12 and Gd3Al2.26Ga2.74O12 single crystals. Optical absorption and photo- and cathodoluminescent properties of these epitaxial garnet films were studied. Ce-doped (Pb, Gd)3(Al, Ga)5O12 garnet films can be used as a fast phosphor in the design of a PIF-01 electron-optical converter.
Ceria-based solid solutions for environmental application
Authors: Zagaynov I V , Shelepin I V , Fedorov S V , Klimashin A A , Kulbakin I V
Published: May 2020

The work is focused on the investigation of the influence of metal oxide promoted ceria based materials with various dopants on the physicochemical, electrical and catalytic properties for CO oxidation in model reaction. The formation of stable solid solutions by doping gadolinium, bismuth, and third metal enhances the redox properties, oxygen vacancies, stability, and, of course, catalytic activity and electroconductivity.
Study of the processes of three-dimensional printing of caprolactone copolymers with methylphosphate groups
Authors: Mariyanats A O , Mironov A V , Nifant’ev I E , Shlyakhtin A V , Popov V K
Published: May 2020

Reconstruction of the damaged or missed organs or skeleton fragments is an ambitious target for regenerative medicine. Tissue engineering construction (TEC) comprising three-dimensional bioresorbable scaffold and living cells can become native tissue substitute. Scaffold should correspond to strict requirements. Generally, its physical-mechanical and biochemical characteristics should be comparable with tissue to be replaced. Besides, resorption rate of scaffold material should correlate with the tissue regeneration rate in each case. Thus, the effect of scaffold manufacturing methods on its properties is an important point in TEC design and fabrication. At present study, thermo-extrusion 3D printing of bioresorbable scaffolds based on polycaprolactone and its copolymer with polyethylene glycol and methylphosphate groups, synthesized by novel chemical route, was investigated. Scaffold surface morphology and its internal structures were studied by optical and scanning electron microscopy. The effect of thermal-induced degradation on polymers properties at various 3D printing processing parameters was analysed by gel-permeation chromatography, differential scanning calorimetry and mechanical testing. It was shown that optimizing experimental parameters the developed methods of thermo-extrusion 3D printing enable effective polymer scaffolds fabrication in accordance with their 3D computer model without significant changes of physicochemical properties of initial materials.
Screening of Process Parameters to Produce Xylanase from Aspergillus niger for Secondary Bioethanol Production
Authors: Tarrsini M , Ng Q H , Teoh Y P , Kunasundari B , Ang W U , Shuit S H , Ooi Z X , Hoo P Y
Published: May 2020

In recent years, the biotechnological use of xylanases has grown remarkably. Xylanase is a hydrolytic enzyme with a broad industrial application. In specific, xylanase can convert xylan into xylose, a fermentable sugar source for secondary bioethanol production. The objective on this study is to investigate the significance of different parameter effects for an efficient xylanase production from Aspergillus niger (A. niger). In this study, four factors: incubation temperature, medium pH, incubation time, and agitation speed were screened by performing One-factor-at-a-time (OFAT) analysis. Xylanase production with the maximal enzyme activity was successfully obtained from OFAT analysis under condition of 32°C, pH 5.0, 5 days, and 150 rpm.
Analysis of vibration response from high damping rubber bearing and lead rubber bearing for using in high rise building foundations subjected to earthquake
Authors: Alifani N , Nirbito W
Published: May 2020

Vibration due to earthquakes that occur in a high rise building like hospital building can disrupt the comfort, as well as operation of the hospital, and can cause casualties because usually, the building response to the earthquake is of a cantilever movement. The solution from a mechanical vibration point of view is to change the response of buildings to earthquakes so that hospital buildings are not destroyed by earthquakes by controlling the response of vibrations that produce lateral movement responses. One technology that is used to increase the resilience of buildings that subjected to earthquake, as well as control vibration response is the application of rubber bearing base isolation on the building foundations. High damping and lead rubber bearings base isolation are used on high rise building foundations which are designed to give lateral motion due to the base isolation construction. The results of computer simulation using ANSYS® software have shown that the rubber bearing base isolation gave vibration response in lateral motion.
Ultrathin Mica and Graphite Cantilevers Enhanced Photoacoustic Spectroscopy – towards Modelling of Acousto-mechanical Properties
Authors: Jan Suchánek , Michal Dostál , Pavel Janda , Zdeněk Zelinger , Jaromír Chalupský , Jan Wild
Published: May 2020

In this article, we present the concept of probing of the acousto-mechanical properties (e.g. spring constant, resonator quality factor) of thin 2D or 2D like samples (i.e., samples with one dimension at least 2 orders of magnitude smaller than the others). Samples prepared from highly ordered pyrolytic graphite and muscovite with thickness under 1 μm and other dimensions in the mm range are used for this purpose. These samples are employed in photoacoustic spectroscopy as the pressure sensitive elements and its movement is monitored by a He-Ne laser beam reflected from the surface of these samples onto a position sensitive detector. The concept includes the following steps: 1) development of the method of preparation of thin samples from layered materials 2) development of the experimental approach for data collection 3) derivation of theoretical behavior of photoacoustic response of the samples and 4) development and application of a model on experimentally acquired data.
Diamond-like Carbon Thin Film Coating for Application on Heterojunction Solar Cells by ECR-CVD System
Authors: Srisantirut Tanawit , Pengchan Weera , Phetchakul Toempong
Published: May 2020

Diamond-like Carbon (DLC) film has the ability to change the refractive index value achieved high transmittance for potential applications of antireflection coating. DLC films were deposited on heterojunction solar cells by the ECR-CVD (Electron Cyclotron Resonance Chemical Vapor Deposition) method using Acetylene (C2H2) and Argon (Ar) gases. DLC coating affects ITO (Indium tin oxide), causing the electrical and resistivity of heterojunction solar cell vary according to the coating time. The surface and thickness of the DLC films was measured with an atomic force microscope. Illuminated I-V characteristic was investigated by photo-I–V measurements. The suitable acetylene anti-reflection deposition time at 0.40 minutes. Therefore, heterojunction solar cell was fabricated on a substrate using the optimized DLC films as an anti-reflection coating and it obtained an increase efficiency of about 1%.
Fuzzy-set analysis of models of temperature deformation of thin-walled elements with elliptic boundaries in industrial and aerospace structures
Authors: Storozhev S V , Storozhev V I , Bolnokin V E , Hai Duong Minh , Mutin D I
Published: May 2020

A theoretical numerical-analytical fuzzy-set methodology to take into account the influence of scatter errors in the values of the initial physical, mechanical and geometric parameters on the estimates of the endogenous characteristics of temperature stresses in models of bending and flat temperature deformation of plate-type thin-walled structural elements with elliptical boundaries in industrial and aerospace equipment was developed. The methodology is based on the use of the alpha-level form of the heuristic principle of generalization in the transition to fuzzy-multiple arguments in the analytical representations of deterministic models for the estimated indefinite indicators of temperature bending moments and circumferential thermomechanical stresses at the boundaries of elliptical holes in thin plates. The results of calculations using the developed technique are presented. The proposed method is intended for use in theoretical and applied research on assessing the reliability and strength of thin-walled plate structural elements of aerospace engineering, industrial equipment and building structures under thermomechanical influences for conditions of uncertainty.
The friction surface destruction mechanism in a magnetic field
Authors: Burdo G B , Bolotov A N
Published: May 2020

The paper considers the mechanism of forming and developing brittle (quasi-coarse) cracks in a sample of ferromagnetic material in a magnetized state. It is shown that the external magnetic field affecting friction surfaces has the most significant effect on the wear process if the cracks open perpendicular to the magnetization vector. The paper describes the criterion of spontaneous crack growth in brittle materials taking into account magnetostatic energy.
Basic laws of filled polyaluminosilicate polycondensation used in printed circuit boards of power electronic spacecraft devices
Authors: Ivanov A A
Published: May 2020

Filled fractal aluminosilicates have been synthesized by a sol-gel method. Optimal conditions to obtain aluminosilicate gels have been determined. The obtained samples have been studied by IR spectroscopy, X-ray phase analysis, transmission electron microscopy, and the du Nouy method. The studies have shown the presence of chemically unbound –OH groups in the aluminosilicates. The effect of the amount of polymer matrix filled with highly dispersed filler powder and medium acidity on the adhesive strength of the dielectric layers applied on aluminum bases by 3D aerosol printing used in printed circuit boards of power electronic spacecraft devices has been studied by means of the du Nouy method.
Electrochemical technology for the formation of heterogeneous metal structures with increased corrosion resistance
Authors: Kireev S Yu , Kireeva S N , Glebov M V
Published: May 2020

Research into corrosion resistance of multilayer materials obtained by the method of potentiostatic pulse electrolysis was conducted. The purpose of the work was to select materials for the creation of multilayer steel coatings with high corrosion resistance, as well as to develop technology for their formation. The formation of galvanic coatings was carried out in stationary and potentiostatic pulse electrolysis modes. The study of corrosion resistance was carried out by accelerated methods in solutions simulating the marine environment. Corrosion resistance of samples made of St3 steel coated with nickel and zinc-nickel alloys of different compositions when using various electrolysis modes was studied. It has been experimentally proved that the potentiostatic mode of pulse electrolysis allows the formation of galvanic coatings with a zinc-nickel alloy of various compositions from one electrolyte. Based on the study of electrode potentials of coatings in various media, the composition of the outer and inner layers of a multilayer heterogeneous structure was substantiated. It was experimentally proved that the formation of multilayer coatings on the surface of steel could significantly increase the protective properties of these coatings. It was theoretically justified that the materials of the layers should have different values of electrode potentials, and the inner layer should have a more negative value of the potential than the outer one has.
Control of spacecraft waveguide dynamic behavior by means of support arrangement
Authors: Kudryavtsev I V , Brungardt M V , Nikitina S N , Kolotov A V , Rabetskaya O I
Published: May 2020

The most important parameters that determine the dynamic behavior of the waveguide in orbit are the first natural vibration frequency and the critical compressive force at which the stability of the waveguide structure is lost. This paper deals with the selection of the type and location of the outermost and intermediate supports for a single waveguide between two microwave units to provide the required values of the first natural vibration frequency and critical compressive force. The most common support arrangement schemes and their corresponding coefficients for equations defining the first natural frequency and minimum critical compressive force are given. For the calculation, the analytical dependencies of beam vibration theory and stability theory are used, which allowed to obtain simple equations and to comprehensively assess the influence of various factors on the obtained results. The results can be used in the design of any extended structures to ensure their dynamic behavior by means of support arrangement.
Structure and properties of hot-deformed powder steels microalloyed by aluminium
Authors: Dorofeyev V Y , Sviridova A N , Berezhnoy Y M , Bessarabov E N , Kochkarova K S , Pustovoit V N , Sviridova S V
Published: May 2020

The feasibility of cohesion degree enhancement, mechanical properties, and contact durability of powder forged steels due to microalloying with aluminum was studied. Unalloyed iron powders with various impurity contents, as well as atomized powder of low-alloy chromium-molybdenum steel, were used as the basis for the producing mixtures. Aluminum was doped as ferroaluminum. Specimens for mechanical and fatigue tests were produced by powder forging. Post-heat treatment was carried out according to two flow routes. The first flow route included carburizing, hardening and low tempering. The second flow route corresponded to high-temperature thermomechanical processing, which was carried out immediately after the completion of hot repressing porous preform. It was found that doping aluminum microadditives in hot-deformed powder steels provides the feasibility of increasing bending strength, impact strength and fatigue life under contact or low-cycle loading. This is associated with an enhancement of the conditions for interparticle joining during hot forging due to the generation of interlayers of ferrite in the interparticle zones as well as to the activation of cohesive interactions as a result of accelerating the process of dynamic recrystallization
Obtaining of tungsten nanopowders by high energy ball milling
Authors: Ozolin A V , Sokolov E G , Golius D A
Published: May 2020

The objective of the work is identifying the modes of ball milling of the W16,5 and PWT grade tungsten that ensure obtaining nanosized powders. Milling was performed with the AGO-2U planetary-centrifugal mill for 5, 15, 60, and 120 min at the carrier rotation frequencies of 400, 800, and 1000 rpm. After milling, the shape and size of tungsten powder particles was studied by scanning electron microscopy. The effect of work hardening and aggregation on milling of the powders has been demonstrated. As a result of ball milling, nanoparticles of tungsten sized from 25 nm have been obtained. It has been found that the minimum size of particles is achieved at the carrier rotation frequency of 800 rpm and milling duration of not less than 60 min.
Technologies and software for the regional catalog of Russian spacecraft satellite data
Authors: Kadochnikov A A , Yakubailik O E
Published: May 2020

The results of research and development devoted to the creation of technologies and software for the satellite data catalog from Russian spacecraft, formed at the Regional Center for Remote Sensing of the Earth in Krasnoyarsk, are examined. The created software package provides a full cycle of operations with satellite data, including their downloading from the Roscosmos Geoportal, pre-processing, archiving, conversion and visualization operations using a specialized geographic information web system. Practical experience with the data provider revealed a number of problems in the source information, which were taken into account when creating the software. In particular, some files were damaged (files are filled with zeros or have an incomplete size), some files in the data folder were missing, the names of files and directories did not meet the declared standards, and so on. Separately, we should pay attention to significant delays in data delivery, which reached six months or more. These problems were taken into account when creating the software.
Technology of producing nanomaterals and their use
Authors: Ospanbekov E A , Aitasov T T , Kairatuly A , Ismailov D V , Partizan G , Kerimbekov D S
Published: May 2020

This work is devoted to the technology for producing nanomaterials, in particular, the method of arc synthesis in helium medium under certain optimal conditions with a maximum yield of material, as well as their practical application as additives, which improve anti-corrosion properties. In this work, we used the extraction of fullerenes using the Soxhlet apparatus, which is designed to evaporate toluene from fullerene-containing sludge. Carbon nanostructures of a mixture of fullerenes C60 and C70 were obtained at a current of ~ 200 A, studied using Raman spectroscopy and optical microscopy at the National Nanotechnology laboratory at KazNU named after al-Farabi.
Damping control system design for SamSat nanosatellite platform
Authors: Kramlikh A V , Lomaka I A , Nikolaev P N
Published: May 2020

In this paper, we discuss the experience of development of a damping control system, based on the B-dot algorithm, for the SamSat unified nanosatellite platform. This platform was created by the center of testing and development of nanosatellites of Samara University. We divide the stabilization process into four repetitive phases: measuring, computing, control and delay for relaxation. Each phase has its particular duration, which significantly influences on the stabilization process. To use the B-dot algorithm, it is necessary to calculate the derivatives of the measured components of the Earth magnetic field induction in the body frame of nanosatellite. The SamSat nanosatellite platform has two three-axis magnetometers, which are characterized by a high noise level. To reduce the impact of this noise, the accumulated measurements are smoothed by the least square method. We provide recommendations for the selection of the damping algorithm parameters such as phase duration and polynomial degree. We conducted laboratory tests on magnetic test bench, following results proofs the efficiency of designed damping control system.
Improving the durability of machine parts connections
Authors: Apazhev A K , Shekikhachev Y A , Egozhev A M , Shekikhacheva L Z , Egozhev A A
Published: May 2020

Durability is the most significant component of reliability, which, depending on the purpose of the object and its operating condition, also includes indicators of failure-free, maintainability and preservation separately or a combination of them (both for the object and for its parts). Improving the strength and durability of machine parts connections, in particular, agricultural, at the present stage is achieved by various methods, the main of which is the method of statistical analysis of connections loading. This method is based on the theory of fatigue damage accumulation followed by strength calculation. The known calculation methods of durability of agricultural machines parts, based on this theory, often involve the use of data on the operation of the machine parts and units, its speed, the surface relief processed by the machine in real operating conditions, as well as duration of the impact of various loads (dynamic, peak or shock). Currently, agricultural producers have increased requirements for the machines used. They are not satisfied with agricultural machines that are often idle for a long time as a result of malfunctions and failures. In critical periods of operation this leads to a decrease in the quality of work, productivity and, ultimately, crop yields. In this regard, it is necessary to develop new agricultural equipment that will be characterized by high operational reliability.
Implementation of the nonlinear programming algorithm when optimizing the final turning mode
Authors: Galkin M G , Smagin A S
Published: May 2020

For computer-aided multi-variant design of machining technologies, it is important to optimize the cutting parameters at the final pass in each technological operation. When carrying out designing procedures, there emerge problems relating to the algorithm of choosing the decision-making method, the objective function, and the regions of feasibility at final machining steps. Linear programming is time-consuming for multi-variant and multi-pass machining, if the algorithm is to be clear. It is known that when simulating the optimal metal-cutting process, the optimization criterion and the system of constraints are non-linear. Therefore, a computational algorithm can be made significantly more efficient if it is a non-linear algorithm based on Lagrange multipliers Such approach to design helps simplify automating the computational algorithm for multi-pass single-tool machining with a precision cutting tool (a reamer) This is the method discussed herein.
Durability increase of mining dump trucks through the use of protective coatings of the body
Authors: Lagunova Y A , Khoroshavin S A , Kalyanov A E
Published: May 2020

The share of trucking in the total cost of open-cast mining is 50% or more. Therefore, reducing transportation costs is one of the tasks of increasing the technical and economic indicators of an open development method, which is an urgent task. Performance dump truck is estimated either by the volume of transported rock mass (in cubic meter or tons), or the value of cargo turnover (ton-kilometers). However, these indicators do not take into account the percentage of adhering rock that is transported uselessly and reduces productivity. The paper proposes methods for protecting the body of a mining dump truck from clay rocks adhering. Detail the method of protection with the help of vibration using metal structure is considered. A mathematical model of the stress-strain state of a two-layer beam is proposed. The dependence of the stress in the body on the stiffness of the elastic supports and impact energy when using a rubber lining is shown.
Computing exact factors for two-sided tolerance limits in a normal distribution with unknown parameters in MATLAB
Authors: Borbatc N M , Chistokletov N Yu , Shkolina T V
Published: May 2020

MATLAB procedure is presented for calculating the exact factors used to find of two-sided tolerance limits in a normal distribution with unknown parameter values. The proposed procedure allows using arbitrary combinations of the sample size and the degrees of freedom of estimated variance. The procedure can be used in systems for processing the results of statistical quality control created on the basis of MATLAB.
Hydroabrasive machining of internal channels of parts obtained by SLM
Authors: Balyakin A V , Goncharov E S
Published: May 2020

The paper discusses the effect of hydro abrasive treatment on the inner surface of products obtained by selective laser melting (SLM). The hydro abrasive treatment effect on the faceting of these products has been investigated, the process simulated in ANSYS, and an area defined in which cavitation bubbles have occurred. The abrasive grain of black silicon carbide has been used as a filler; cylindrical samples printed of VT6 titanium alloy (an analog of Ti6Al4V) have been processed.
Digital control systems for asynchronous electrical drives with vector control principle
Authors: Jumaev O A , Sayfulin R R , Samadov A R , Arziyev E I , Jumaboyev E O
Published: May 2020

Problems of optimizing the operation modes of an asynchronous electric drive according to the criterion of the minimum stator current, as well as the optimal control system of an asynchronous motor with a reference rotor flow vector, which can be used for most serial frequency converters, longitudinal components of the stator current are added to the control channel.
Methods for assessing the strength of the blades of soil-cutting parts of forestry machines
Authors: Kretinin V I , Sokolova V A , Markov V A , Teppoev A V
Published: May 2020

One way of increasing the wear resistance of working bodies of forestry machines is the use of strengthening technologies. Working tools of tillage machines used in forestry are dampened as a result of edge damage during multiple strike impacts of solid soil inclusions along blade edge. The purpose is to identify the pattern of damage of the blade edge of the of soil-cutting parts of forestry machines and theoretically justify the algorithm of strength evaluation in order to determine the rational thickness of the wear-resistant coating during strengthening. Instrumental and analytical studies were carried out on the damage of the reinforced blade edges as a result of multiple impacts on the pendulum copra. Mathematically described is the process of blade edge failure. In the course of multiple strike impacts of soil solid inclusions on the blade edge, there will be accumulation of volumetric damage because of plastic crumpling or chipping. The sharpness of the self-sealing reinforced blade is determined by the thickness of the reinforcing layer and its ability to resist collapse under strike impactsize.
Theoretical justification of the feed preparation technology by the gear pelletizer
Authors: Frolov V Y , Samurganov E E , Samurganov G E
Published: May 2020

In order to provide the livestock industry in the Russian agro-industrial complex with a feed of the right quantity and quality, it is necessary to conduct research on the design and creation of a set of technical tools, applicable to large, medium and small farms. Scientific researches and development on the design and creation of models of such tools are carried out at the Department of Mechanization of animal husbandry and life safety of FSBEI HE Kuban SAU. In particular, the design of the gear-type pelletizer with the main working body consisting of a matrix with pressing channels and gears, engaged in the complex motion when rolling the matrix, was developed. The working process of pressing the material consisting of crushed grain fractions, by the pelletizer, was described. As a result of theoretical substantiation the significant formulas of channel outlet pressure and pelletizer’s performance were derived by the end of the article.
Peculiarities of choice of materials for pistons of heat engines
Authors: Skryabin M L , Kuklin S M
Published: May 2020

In the modern automotive industry, heat engine pistons must have sufficient strength characteristics to ensure the necessary reliability and durability under high dynamic, mechanical and thermal loads. Currently, aluminum alloys, cast iron, steel and composite materials are used in domestic and international practice for the production of pistons. The use of cheap reinforcing elements made of carbon materials instead of expensive ceramic and boron fibers, silicon carbide particles will significantly reduce the cost of pistons and make them more affordable for mass production.
Calculation of parameters for altering the ship’s course at sea using Artificial Neural Network (ANN)
Authors: Nguyen Thai Duong , Nguyen Trong Duc
Published: May 2020

During ship manoeuvring and course alteration, the trajectory of ship or the time of ship’s turning which remarkably affect safety and effectiveness of navigation depends on ship’s factor, meteorological factor and control factor. Simulation commonly is applied for methods used for calculating the ship’s trajectory. However, these computed results which are only applied for simulated cases or for certain external affected conditions are not reliable enough for navigation officers to predict the ship’s turning index in practical situations. In this article, authors propose the model for calculating the ship’s course alteration by applying artificial neural network in order to assist navigation officers making decision of manoeuvring ship safely and effectively, especially in emergency situations.
The method for determining the profile of large diameter pipes and the optimal technological mode during calibration-bending in the weld zone
Authors: Nguyen D C , Efremov D B
Published: May 2020

The article presents the results of finite-element modeling of the local calibration-bending process of large-diameter pipes in the weld zone with control of the dynamics changes in the geometry of the inner and outer surfaces of the workpiece, the base diameter, the total deformation of the perimeter and ovalization of the contours. The author has developed the technique of determining the coordinates of surface grid nodes based on an algorithm implemented in a special LUA-program for the QForm complex. The developed modeling technique allows us to determine the optimal working stroke of the tool and other parameters of the local calibration of the tube billet to minimize its degree of ovalization. An example of the implementation of the local calibration method and the predicted change in the geometry of the contour of the pipe billet with diameter φ1420×40 made of K60 steel with the initial shape defects after welding is given. The technical implementation of the method of local correction and prediction of the tube billet profile is complemented by the possibility of editing it by expansion. Improving the accuracy of geometry in the end zones of pipes will directly increase the possibility of high quality butt-welding during installation of pipeline systems.
Assessing energy efficiency factors in industrial companies
Authors: Kelchevskaya N R , Shirinkina E V , Atlasov I V
Published: May 2020

The relevance of the study is due to the fact that changes in the energy management policy at the national level, rising energy prices and increased state environmental control over production prompt industry to develop effective organizational and technical solutions in the field of energy management. The aim of the study is to identify energy management factors that determine the success or failure of the implementation of energy efficiency measures in industrial companies. In the empirical part of the study, the case-stage method was used to analyze the energy management practice of large metallurgical enterprises, where the problems of energy conservation are especially acute due to the high energy intensity of production. A promising direction in such an environment is the integration of structural components used to support decisions and social components represented by staff commitment and accumulated energy-efficient human capital. The main results can be applied in the practice of energy system management in the development of strategic planning processes, the adoption of sound investment decisions and the formation of energy-efficient human capital.
Modeling and typologization of rural areas by the level of agricultural production development and the population density farms
Authors: Korobeynikov D A , Ivanova N V , Ovchinnikov M A , Kolpakova E A , Tokarev K E
Published: May 2020

The article describes a method for clustering rural areas has been developed that involves building a composite index based on the aggregation of six individual indicators that comprehensively characterize the level of agricultural development. Regional differentiation of the calculated index values allowed us to identify five typological groups within which it is possible to trace the correlation between the level of agricultural development and population density. The first group included twenty-one subjects of the Russian Federation located in the European part of the country, with the most developed agriculture and a predominantly higher density of rural population in comparison with neighboring regions. The second group includes 24 subjects of the Russian Federation (including the most populated North Caucasian republics – Dagestan, Ingushetia, Kabardino-Balkaria) with a range of index values from 0,501 to 0,550, corresponding to developed agriculture. The third group includes 26 subjects of the Russian Federation with a range of index values from 0,401 to 0,500, indicating the average development of agricultural production, which is largely a consequence of the general socio-economic problems of the regions. The fourth group includes 5 subjects of Siberia and the Far East With a range of values of the complex index 0,351-0,400, which are characterized by unfavorable ground-climatic conditions that objectively limit the development of agriculture and rural territories. Six regions complete the rating, some of them belong to the Northern territories with unfavorable climatic conditions (Murmansk region, Nenets district, Yamalo-Nenets district), some are outsiders in terms of socio-economic development (Republic of North Ossetia-Alania, Republic of Altai, Republic of Khakassia).
The rationalization model of the use of enterprise resources
Authors: Lubnina A A , Bashkirtceva S A , Rajskaya M V , Zaripov R N
Published: May 2020

The article proposes a logical-informational model that allows to rationalize the use of enterprise resources, using the example of the mechanism for advanced training of personnel “innovative lift” FSBEI HE “KNRTU”. Implementation of innovative elevator mechanisms of FSBEI HE “KNRTU” allows to improve the process of adapting industrial and industrial personnel to the requirements of the profession, mastering professional competencies necessary to perform labor functions, including the implementation of scientific and technological developments and the commercialization of their results. Based on the model of rationalizing the use of enterprise resources, a software product has been developed based on solving linear programming problems aimed at maximizing the target indicator and rationalizing the distribution of resources within the framework of the organizational structure of the enterprise.
Decision making support for the development of new products based on Big Data technology
Authors: Shinkevich A I , Zaraychenko I A , Ivanova R P , Vodolazhskaya E L
Published: May 2020

The paper presents an analytical model for constructing a production system based on the application of the concept of big data. There are proposed a model for data collection and the architecture of a dynamic control system based on KPI modeling and construction of predictive models. A model for processing system data is developed, based on the use of a dynamic three-dimensional indexing data in the following areas: equipment, technology and schedule. Based on this approach, it is proposed to use the multiple linear regression model with fixing system constraints to solve the problem of optimizing production resources.
The problems of the machine-building enterprise economic development
Authors: Makarenya T A , Kazanskaya A Yu
Published: May 2020

The article is devoted to studying the problems of the machine-building enterprise development using the example of public joint stock company Taganrog Combine Plant “Krasny Kotelshchik” (PJSC TKZ “Krasny Kotelshchik”), located in the city of Taganrog, Rostov Region, Russian Federation. PJSC TKZ “Krasny Kotelshchik” is one of the leaders in the Russian boiler equipment market. Currently, equipment, manufactured at this plant, operates in more than 60 countries of the world. The main directions of equipment export in 2018 were the Community of independent states (CIS countries) – Belarus, Kazakhstan, Asia (Vietnam, India) and others. Despite the leading position in the boiler equipment market, this company is in a difficult financial situation. Therefore, the purpose of this article is to study factors affecting the success of a machine-building enterprise and determining the main promising areas of development.
Ensembles of criteria for determining the number of homogeneous groups in a combined batch of industrial production
Authors: Rozhnov I P , Kazakovtsev L A , Karaseva M V , Stupina A A , Lapunova E V
Published: May 2020

An article proposes a procedure for ensembles of criteria formation for determine automatically a number of clusters for dividing a combined batch of industrial production. It is shown that these ensembles of criteria can improve the accuracy of the separation of combined batches of industrial production into homogeneous ones.
Economic and mathematical analysis of efficiency leasing in the electronic industry
Authors: Kirillov Yu V
Published: May 2020

The article, using the example of electronic industry enterprises, examines the operation of financial leasing of high-tech equipment to upgrade fixed assets in order to produce competitive products. An analysis is made of the effectiveness of the use of equipment necessary for the production of leased (rented) equipment as a special investment project implemented by the lessee, in which rental payments are an investment part of the project, and the profit from the sale of manufactured products makes up its profitable part. Analytical indicators of reduced net income and profitability index are supplemented by a payback period indicator, for the calculation of which a laborious recursive-logical procedure is used in practice. To obtain an analytical expression of the payback period, an original technique was used based on replacing a discrete payment stream with a financially equivalent continuous stream of payments. The obtained analytical formula made it possible to determine the fundamental economic and mathematical conditions for the payback of this operation for the lessee.