bluuebunny/crossref_metadata_2025_split huggingface dataset:
The fractal approach and the effect of nanoadhesive in polymer nanocomposites
Authors: Lee R I , Rizaeva Y N , Manaenkov K A , Psarev D N , Kiba M R 
Published: September 2020

Abstract
Currently, a thermodynamic fractal model of the formation of an interphase layer in polymer nanocomposites is becoming widespread. In accordance with this model, the surface of nanoparticles with which the polymer matrix interacts is a fractal object. This means that the number of contact points depends on the dimension of the nanoparticle surface accessible for such a contact (unshielded). The dependences of the interfacial adhesion parameter on the coefficients of thermal expansion, nanoparticle size, fractal dimension of the nanoparticle surface, etc. have been obtained. In polymer nanocomposites, the level of interfacial adhesion, in comparison with microcomposites, is an order of magnitude higher. This phenomenon is called the nanoadhesion effect and it has an absolutely dimensional character, i.e. takes place when polymers are filled with nanosized particles. Currently, to assess the level of interaction between the phases “nanoparticle-polymer” use the parameter of the level of interfacial adhesion, which is calculated by the values of three quantities: the actual coefficient of linear thermal expansion of the investigated nanocomposite, the coefficients of linear thermal expansion, calculated by the rule of mixtures and by the Turner formula. Considering a nanoparticle as a fractal object, it is possible to estimate the influence of the nanoparticle size, fractal dimension of the nanoparticle surface, and the volumetric content of the filler on the level of interfacial adhesion in the nanocomposite. The article investigates the influence of the size of nanoparticles and the fractal dimension of the surface of aluminum nanoparticles on the parameter of interfacial adhesion. It has been established that filling the polymer matrix with aluminum nanoparticles with the size rn
= 35nm, fractal dimension of the nanoparticle ds
= 3,3 surface will provide the effect of nanoadhesion in the new nanocomposite based on the elastomer. Experimental studies have confirmed the presence of the nanoadhesion effect in the nanocomposite based on the F-40C elastomer, which manifested itself in an increase in its deformation and strength properties. The optimal composition of the nanocomposite, which provides the highest deformation and strength properties of the material, has been determined.
The influence of the Friction Stir Welding process on the non-heat-hardenable aluminum alloy AA5056 structure formation depending on the sheet workpiece rolling direction
Authors: Kalashnikova T A , Zhukov L L 
Published: September 2020

Abstract
This paper is devoted to the study of friction stir welded joints made of 5-mm-thick aluminium alloy AA5056 sheet metal. These joints were produced using workpieces cut along and across the rolling direction of the material. Metallographic studies were carried out to determine the structural features of joints obtained by friction stir welding. Tensile tests across the weld were carried out to verify that the ultimate tensile strength requirements for the welded joint are met. It was found out that mechanical properties of joints are different depending on the rolling direction. In the case of welding along the rolling direction with varying parameters, a large number of welds have an ultimate tensile strength of at least 0.9 of the base metal one. In the case of welding across the rolling direction, in some cases the ultimate tensile strength of the weld exceeds that of the base metal. As a result of the research, it was found that when welding in different directions relative to the rolling direction, there is a wide range of friction stir welding parameters for 5-mm-thick workpieces made of AA5056 alloy, which also depends on the rolling direction of workpieces.
Amphiphilic polymers of N-vinylpyrrolidone and their protective properties during the formation of metal nanoparticles
Authors: Ostaeva G Yu , Morenko I V , Isaeva I Yu , Eliseeva E A , Kuskov A N 
Published: September 2020

Abstract
The possibility of using amphiphilic polymers of N-vinylpyrrolidone as polymer protectors of metal nanoparticles is researched. When metal ions are reduced in aqueous solutions of the corresponding salts in the presence of amphiphilic polymers, copper nanoparticles with a diameter of 4-12 nm or palladium particles with a diameter of 3-5 nm are formed. Nanoparticles are included in rather large aggregates of micelles of amphiphilic polymers. It was found that extremely stable sols are formed in the presence of amphiphilic polymers. In this case, the stability of sols to irreversible aggregation and oxidation of metal nanoparticles increases both with increasing length of the polymer’s hydrophilic chains and with increasing length of hydrophobic fragments. In the presence of a low-molecular-weight electrolyte, particles with a smaller diameter are formed. However, the resistance of metal nanoparticles to oxidation is reduced by 6-10 times.
Influence of structural form of elements on corrosion of metal structures
Authors: Gushchin S N 
Published: September 2020

AbstractThe article considers the influence of the structural form of elements on the corrosion of metal structures. Corrosion is the spontaneous destruction of metals and alloys as a result of chemical, electrochemical or physical-chemical interaction with the environment. Usually, local corrosion is the result of the concentration of the anode reaction of metal ionization on certain small areas of the metal surface, while the rest of the surface is mainly cathodic reactions. The most typical example of local corrosion due to structural features of metal is intergranular corrosion of stainless steels and aluminum alloys. A high rate of metal ionization along the boundaries of grains or intermetallic compounds leads to the predominant dissolution of these sites, which weakens the bond between individual crystals. When designing the equipment, it is not necessary to cover individual parts of the device with insulating materials, and it is also necessary to exclude the possibility of solid precipitation and scale. The latter is partially achieved by the correct choice of the electrolyte speed and continuous mechanical removal of precipitation.
Polycrystalline diamond CVD-synthesis on modified silicon substrates from methane-hydrogen plasma
Authors: Maslov A L , Polushin N I , Laptev A I , Vysotina E A , Martynova T V 
Published: September 2020

Abstract
The widespread use of diamond in electronics, photonics and other fields of science and technology is currently constrained by the possibility of obtaining high-quality material – polycrystalline diamond CVD-films on silicon, molybdenum, copper and other materials, as well as a small deposition area. Substrates special pretreatment will allow solving both problems. This paper presents the results of the synthesis of several types of polycrystalline diamond film (light-gray, gray and dark-gray) on a modified silicon substrate. We discuss the technical aspects of modifying silicon substrate surface and the synthesis parameters of each type of film. The results obtained in this work allow in the future significantly increase the geometric dimensions of deposited diamond films without reducing their quality, which will make it possible to use them as optical windows.
Express-analysis of nitrogen content in CVD-diamonds by FTIR-spectrometry
Authors: Martynova T V , Polushin N I , Laptev A I , Maslov A L 
Published: September 2020

Abstract
Natural and synthetic diamonds most often contain nitrogen impurities, which can form tens of impurity and impurity-vacancy centers in the crystal structure of diamond. At the same time, crystals properties of and possibility of their use in specific application strongly depend on the diamonds impurity composition. In this work, we investigated by the method of Fourier-transform infrared spectrometry (FTIR) the impurity composition of HPHT-diamond substrates and changes in it after the deposition of diamond layers by the CVD-method. We used Ardis 300 for deposition of diamond layers from methane-hydrogen plasma with 3% methane at a temperature of 1100 °C, a pressure of 26.7 kPa and a power of 3800 W on diamond HPHT-substrates containing from 70 to 200 ppm of nitrogen. The proposed technique makes possible to study the integral content of impurities in diamond, which will make it possible to quickly evaluate the result of the diamond layers synthesis and conclude about the possibility of their application in various fields of science and technology, as well as use in jewelry industry.
Growth of polycrystalline CVD-diamond and its defective structure
Authors: Maslov A L , Polushin N I , Laptev A I , Vysotina E A , Martynova T V 
Published: September 2020

Abstract
Polycrystalline diamond films are used in various fields of science and technology, for example, in photonics and electronics. The growth of high-quality polycrystalline films is restrained by the formation of small cracks at the periphery, which are associated with thermal stresses, as well as a low growth rate. Treatment of the substrate surface makes it possible to increase the initial rate of film formation and to form a continuous layer of diamond film on its surface. In this work, we presented the results of the synthesis of polycrystalline films, the optimal deposition mode and the growth rate of such the film and the topology of its surface. The results obtained in the future will make it possible to obtain high-quality polycrystalline diamond films of a larger area, which will significantly increase the diameter of finished products made of them.
Influence of polymer pseudo-matrix on the formation of copper nanoparticles on the steel surface
Authors: Ostaeva G Yu , Morenko I V , Isaeva I Yu , Eliseeva E A 
Published: September 2020

Abstract
The processes of copper reduction on the steel surface in the presence of a polymer protector were researched to determine the effect of the polymer pseudo-matrix on the characteristics of the resulting nanoparticles. Poly(N-vinylpyrrolidone) with different molecular mass, poly(ethylene glycol) and poly(ethylene glycol monolaurate) were used as a polymer pseudo-matrix. Transmission electron microscopy, scanning electron microscopy, electron spectroscopy, and thermogravimetric analysis were used to characterize the synthesis products. It was found that in the presence of a polymer protector, nanocomposite particles are formed, including copper-containing particles and a polymer. It is shown that the nature of the polymer affects the morphological structure of nanocomposites formed on the surface of steel. In the presence of poly(N-vinylpyrrolidone), spherical agglomerates consisting of smaller copper particles are formed. In the presence of poly(ethylene glycol monolaurate), needle-like structures are formed. In the presence of poly(ethylene glycol), dendritic structures are formed. In this case, copper nanoparticles of 3-10 nm size are formed directly on the steel surface in the presence of poly(N-vinylpyrrolidone) or poly(ethylene glycol monolaurate).
Study of the stability of the geometric dimensions of wax models of GTE blades using rapid prototyping technology
Authors: Vdovin R A 
Published: September 2020

Abstract
The work presents the results of a study of the stability of geometric dimensions of wax models of compressor stator blades of the 15th stage, manufactured using rapid prototyping technology. In the process of performing the work, the algorithm for assigning the total shrinkage was studied. It is established that the deviation of geometric dimensions, both in the greater and in the lesser direction relative to the nominal size of the blade is caused by the amount of volumetric shrinkage of the material used. Measuring the linear dimensions of wax models of blades allowed us to determine the nature of the geometry deviation for further accounting and compensation.
Technological basis for the synthesis of polymer composite on the basis of highly filled with tungsten oxide polyimide matrix
Authors: Yastrebinsky R N , Pavlenko Z V , Yastrebinskaya A V 
Published: September 2020

Abstract
When creating highly filled compositions based on powder components, it is necessary to take into account the physical processes both at the stage of activation and mixing of the components, and at the stage of forming the product by pressing at high pressure. The paper presents a probe microscopy of the surface of a polyimide composite with a filler of various compositions. The optimal composition of the composite material is determined based on the data on the passage of ultrasonic waves in it. The dependence of the density of the composite on the content of the filler and the pressing pressure, as well as the change in the uniformity of the surface on these factors, has been established. It is shown that when using modified tungsten dioxide, the homogeneity and filling of the composite increases to 20% in comparison with unmodified tungsten dioxide at the same material strength. An increase in the strength characteristics of the polyimide composite due to the crosslinking of the polymer matrix with the filler has been established.
Features of the effects of oriented plastic deformation in rectangular bars
Authors: Gushchin S N 
Published: September 2020

AbstractThe article considers the features of the effects of oriented plastic deformation in rectangular cross-section rods. The effect of changes in elastic resistance thresholds is that in cases when products are subjected to loads in the same directions as previous plastic deformations, the elastic resistance boundaries expand. Some elements of structures exhaust reserves in the initial stages of loading, causing early appearance of foci of destruction. With increasing deformities, the number of foci increases and can reach dangerous development. Since the residual stresses, as well as the stresses from the applied loads, are always oriented in some way, the results are determined by adding all the components. Turning to the question of the physical prerequisites for using more convenient parameters, it should be emphasized that the widespread interpretation of curved sections of loading diagrams as symbolizing the hardening of materials cannot be used as the basis for the choice of design parameters. Independent objects of application of the calculation system can be used to determine the residual stresses themselves using the derived calculation dependencies.
Optical fluorescent memory with a recording media based on 3- (thiophene-2-carbonyl) -2- (furan-2-yl) -4n-chromen-4-one
Authors: Adamov G E , Kurbangaleev V R , Poroshin N O , Malyshev P B , Levchenko K S , Shmelin P S , Grebennikov E P 
Published: September 2020

Abstract
The physical limitations of the amount of data stored on optical media are pushing researchers to create new materials and methods for recording and reading data. One of the promising areas is the use of fluorescent compounds. Within the framework of this work, polymer structures of optical fluorescent memory with a recording medium based on 3-(thiophene-2-carbonyl) -2- (furan-2-yl) -4n-chromen-4-one in polymethylmethacrylate have been fabricated and investigated. The concentration of chromone was 5% (wt.), Which during recording made it possible to achieve optical density values at λ = 442 nm in the range of 0.01 – 0.02 with a central layer thickness of 1-3 µm. In the structures developed, the process of two-photon information recording and fluorescent parallel reading is realized. The threshold recording power density for providing a two-photon process was (5.1 ± 0.4) 105 W/cm2.
Empirical data processing technique for studying the influence of technological parameters on tool feed during the final processing of steel and cast-iron workpieces
Authors: Galkin M G , Smagin A S 
Published: September 2020

Abstract
When implementing a multi-variant design of the machining process, one of the important tasks is to select rational technological parameters at the final transitions of the forming process, ensuring the specified quality of surfaces on the finished part made of the appropriate material. When modeling most design procedures at all stages of machining, there are problems associated with algorithmization of the solution method, adequate selection of the regression equation and the range of acceptable solutions at the specified processing stages. In this paper, as an algorithm for solving the problem, we propose the use of a well-known method of rational planning of the experiment, which allows us to obtain a mathematical model of the multi-factor process under study. In the process of implementing this algorithm, based on a priori information, the research object was selected, its factors and the main levels of changes in these factors were determined. The proposed algorithm for obtaining the regression equation for solving problems in the field of machining production can be effectively used in computer-aided design systems for selecting technological parameters in the modes of processing parts with a blade tool, using numerical data from technological reference books and catalogs of cutting tool manufacturers.
Modeling of the influence of technological parameters on surface quality, when processing a polymer material, according to a numerical experiment
Authors: Galkin M G , Smagin A S , Poupyreva A S 
Published: September 2020

Abstract
When designing the machining process, one of the essential tasks is the rational choice of cutting modes for various materials, which guarantee the specified quality of the processed surface while ensuring the performance of the process being implemented. The paper describes an algorithm for implementing a multi-factor experiment of the cutting process with a blade tool and constructing a regression equation based on it that describes the quality of the treated surface on polymer material blanks. To implement the algorithm, it is proposed to use the method of planning a rational experiment, which is convenient for obtaining different mathematical models when studying multi-factor processes. In this context, when modeling the three-factor experiment, the initial data of domestic production of various types of polymer materials were taken into consideration. The developed method can be effectively used in the conditions of operating machine-building enterprises for modeling the roughness of the processed surfaces, through a mechanism for rational selection of processing modes, especially in the absence of relevant reference data, and integrated into existing automated systems created on the basis of General-purpose application software.
Complementary industrial cyber-production
Authors: Shukalov A V , Zharinov I O , Zharinov O O 
Published: September 2020

Abstract
A significant aspect of advanced industrial cyber-production (ICP) in the proposed understanding of the Industry 4.0 concept is complementarity. Complementary ICP is a business-system (BS) of mutually beneficial commercial companies interacting with each other. Companies resort to ensuring the complementary of ICP to improve their business processes with the resources of the BS. The problematic issues and methods of organizing a stably functioning complementary ICP are considered. A promising way to improve complementary ICP is the introduction of adaptive management mechanisms for the supply chains of components in the overall BS. Adaptive supply chain management tools optimize inventory and supply logistics. A scheme of interaction between business entities forming complementary ICP is proposed. Adaptive management and complementary ICP bring to life the ideal business approaches of a virtual factory.
Models for dispatching machine-building divisions
Authors: Bolotov A N , Burdo G B 
Published: September 2020

Abstract
The article deals with an approach to dispatching the work of mechanical processing technological divisions of machine-building single and small-scale multi-product production. Algorithms for dispatching technological processes based on the fuzzy control device are shown. Input and output fuzzy variables are defined and their membership functions are presented. The control algorithm is given in the form of fuzzy rules. An example of the algorithm implementation is shown.
Approaches to standardization in the automatic control of water quality for water supply and wastewater systems
Authors: Sambursky G A 
Published: September 2020

Abstract
Automation of analytical control of the composition and properties of drinking and treated wastewater can be considered in two directions: compliance with quality requirements and optimization of the treatment process. Measuring systems with which it is possible to organize automatic control of the composition of drinking and wastewater allow real-time regulation of the technological processes of water treatment and water purification, as well as providing the required hygienic and environmental control in accordance with the requirements of environmental and sanitary legislation. The article presents approaches to standardization of automatic control systems of pollutants in water, shows the possibilities and some limitations of automatic control systems from the standpoint of standardization, identifies indicators that can be interchangeable for automatic control systems of pollutants in water, and presents methodological approaches to determining the corresponding conversion factors.
Development of a methodology for evaluating the operational properties of elastic elements for various purposes by acoustic emission
Authors: Remshev E Yu , Voinash S A , Kokieva G E , Teterina I A , Sokolova V A , Krivonogova A S , Pushkov Yu L 
Published: September 2020

Abstract
In transport engineering, elastic elements are widely used that work under static, dynamic and cyclic loads. Elastic elements are required to demonstrate specified operational properties within specified limits and for a long time. The most widely used mechanisms are tension, compression and torsion springs with a different profile and made from various materials. The main operational properties of elastic elements are strength, relaxation resistance and elastic characteristics. The existing methodology for assessing the relaxation resistance of elastic elements consists of building a relaxation curve using the results of measurements of the force before and after cyclic loads. This technique has the following disadvantages: the relaxation resistance of a sample batch of elastic elements is assessed; and the control implementation is associated with a significant complexity and high energy costs. To assess the most important indicators of reliability and durability, as well as relaxation resistance for a long period of operation, non-destructive testing methods, including the acoustic emission method, are of interest. Existing techniques are highly complex and do not always guarantee a good result. We propose to use a technique based on the registration of acoustic emission signals.