bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fluorine coatings influence on the performance characteristics of flexible bellows
Authors: Amirkhanov E I , Bazhin V Yu , Novikov I A , Logunov V V 
Published: September 2020

Abstract
Currently, the problem of increasing resource, durability and improving technical characteristics is urgent for bellows expansion joints, which are widely used in various branches of technology, such as nuclear power, shipbuilding, mining engineering, etc. This problem can be effectively solved through the use of organofluorine coatings such as epilams, and of appropriate bellows modification technologies. To assess the of such nanocoatings and modification technologies results, the authors of the article develop a physico-mathematical model of bellows expansion joints functioning, based on the analysis of the mechanisms of fatigue failure and wear, such as Rebinder effect and fretting friction. The authors established the relationship between the model parameters and various technologies for bellows expansion joints manufacturing. The developed model makes it possible to evaluate existing and promising technologies for manufacturing bellows expansion joints, as well as to formulate requirements for increasing the bellows expansion joints performance.
Abnormal behavior of the torque in the system of magnetite-maghemite γ – Fe2O3 – Fe3O4
Authors: Urinov Kh O , Amonov A K , Jumanov Kh A , Mujdibaev I Sh , Mamasadikova N M 
Published: September 2020

Abstract
An abnormal behavior of the torque in the magnetite-maghemite system was found when studying the effect of physical composition on the magnetic anisotropy of the γ – Fe2O3 – Fe3O4 solid solution. The object of the study was thin epitaxial layers of oxides deposited on the surface (001) of a magnesium crystal Mg by chemical transport reactions.
Siloxane based lubricating oils
Authors: Burdo G B , Bolotov A N 
Published: September 2020

Abstract
Technological features of the synthesis of the lubricating nano-oil based on polyethylsiloxane are described, and its lubricating properties under various friction conditions are investigated. Recommendations are given on the selection of components for creating a magnetic lubricating nano-oil, which are characterized by various mechanisms to reduce friction and wear of rubbing surfaces. The specific features of the processes of friction of surfaces lubricated with magnetic nano-oil are shown.
OES diagnostic of SF6/Ar gas mixture of ICP discharges for LiNbO3 etching
Authors: Osipov Artem A , Osipov Armenak A , Berezenko Vladimir I , Alexandrov Sergey E 
Published: September 2020

Abstract
The results of a study of the influence of technological parameters of the process of plasma chemical etching in inductively coupled plasma on the emission spectra of fluorine and argon atoms are presented. The effects of inductively coupled plasma RF power, operating pressure and bias voltage were studied for 6 different sulfur hexafluoride argon (SF6/Ar) gas mixtures: SF6 (1.5 sccm)/Ar (9.2 sccm), SF6 (7.8 sccm)/Ar (10.8 sccm), SF6 (4.7 sccm)/Ar (6.0 sccm), SF6 (7.0 sccm)/Ar (4.9 sccm), SF6 (11.7 sccm)/Ar (5.4 sccm), SF6 (9.4 sccm)/Ar (3.3 sccm). It is shown that a decrease in the operating pressure and an increase in the RF power of the inductively coupled plasma leads to an increase in the relative intensity of both argon and fluorine lines. Variations in the bias voltage have no significant effect on the emission intensity of the spectral lines of Ar and F.
Crystallization and rheological properties of alloys
Authors: Korostelev V F , Denisov M S 
Published: September 2020

Abstract
In the presented work, compressibility is proposed as a property characterizing rheology, i.e. a relative decrease in the volume of liquid metal under the influence of pressure. Compressibility depends on many factors; at a fixed cooling rate, the dependence of compressibility on pressure is established experimentally. The research used industrial equipment for melting metal, pouring it into special equipment, applying pressure to liquid and crystallizing metal according to the program, as well as for recording computer diagrams describing the dependence of compressibility on the magnitude and rate of pressure application. The pressure was varied in the range of 0 … 400 MPa for 4-7 sec, the compressibility value was fixed at the level of 12-13 %. It is also established that the difference in the structure of the B95 alloy formed from a melt pre-pressed under high pressure consists in the absence of pronounced grain boundaries, and in the special character of the release of excess phases, indicating the manifestation of the growth of dendritic cells from the centers of crystallization. The advantages of the developed casting process with high-pressure pressing of liquid metal is a significant reduction of production cycle duration and metal losses, as well as the absence of necessity for processing workpieces by plastic deformation methods.
Structural studies of additive hard magnetic alloy Alnico24
Authors: Zhukov A S , Barakhtin B K , Bobyr V V , Titova A D 
Published: September 2020

Abstract
The structure of the hard-magnetic alloy Alnico24 manufactured on the Russian SLM FACTORY selective laser melting unit was studied. Powder for alloying with a fraction of up to 80 μm was obtained by melt atomization from ingots on a HERMIGA 75 / 3VI unit. At various scanning modes and laser power, additive samples were manufactured to the structure studies. Detailed structural studies were performed using multifractal parameterization.
Development of organic poultry farming based on environmental engineering
Authors: Roiter L M , Eremeeva N A , Roiter Y S 
Published: September 2020

Abstract
In modern market conditions, the issues of the need to expand the market potential of the poultry industry through the production of organic products that balance the ecosystem and human needs for natural food are increasingly discussed. Today, the main focus is on getting the maximum profit at the lowest cost. This goal is achieved due to the intensity of growth and development of a biological object through the use of antibiotics, growth stimulants and preservatives, as well as other animal protection products, which are integrated as manufactured products and the translation of these negative factors through the body of the bird to humans. This is confirmed by the results of studies conducted by the Food and Agriculture Organization of the United Nations (FAO) on the lack of vitamins, minerals, trace elements in the production of products based on intensive technologies. They call this situation “hidden hunger”, which leads to nutritional deficiencies, that is, a state where the quality of the food consumed does not meet the needs of a person. According to FAO data, about 2 billion people in the world experience “hidden hunger”. This situation gradually leads people to comprehend the need to return to natural, natural standards of farming. Organic poultry farming is one of the manifestations of this process. The idea of sustainable development of any industrial enterprise that can simultaneously reduce the harmful impact on the environment and increase the efficiency of technological processes is allowed by environmental engineering, which is an approach of technological and engineering origin, aimed at improving and maintaining conditions for maintaining anthropomorphic safety, preserving useful ecosystems and improvements. environment-related living conditions of people. With regard to the production of organic poultry products, environmental engineering is intended to study and design specialized modules at all stages of the life cycle of this technology, close to the natural habitat of the poultry population.
Method of estimating the Pareto-optimal solutions based on the usefulness
Authors: Zargaryan E V , Zargaryan Y A , Kapc I V , Sakharova O N , Kalyakina I M , Dmitrieva I A 
Published: September 2020

Abstract
This article briefly discusses methods for finding Pareto-optimal solutions for multi-criteria problems in the conditions of uncertainty. It is noted that the quality of management depends on the adequacy of the rule base for the selected fuzzy controller set by experts. The conditions for the final decision of the choice of the Pareto-optimal fuzzy solution are determined. An algorithm for the method of estimating the Pareto-optimal solution taking into account utility is developed and presented. Multicriteria optimization of the functioning of control systems is considered when setting local criteria in the form of fuzzy intervals. Scalarization methods that are used in ranking criteria are considered. Quantitative determination of the criterion is applicable if its numerical comparison is possible. The objective function is determined by local criteria. Optimization is associated with the search for control actions that provide optimal values of the multidimensional objective function. For problems with threshold optimization, a similar estimate can also be obtained. Given that, when analyzing solution options, complexity scales are constructed, an estimate of the time to build the complexity scale is also introduced. The application of the threshold optimization method to search for the Pareto optimal solution is considered. An approach to evaluating Pareto-optimal solutions using the criteria for evaluating utility is proposed. An algorithm has been developed to evaluate the Pareto-optimal solution taking into account utility.
The effect of plasma electrolytic polishing on the surface properties of titanium alloy after plasma electrolytic chemical-thermal treatment
Authors: Kusmanov S A , Tambovskiy I V , Silkin S A , Nikiforov R V , Belkin P N 
Published: September 2020

Abstract
A change in the surface morphology of a titanium alloy under the influence of its erosion as well as dissolution and oxidizing for cathodic or anodic carburizing was studied. An electronic microscope was applied to investigation of surface morphology and cross-section of modified specimens. The roughness of samples surface and their microhardness were measured. It was found that the decrease in the samples weight after cathodic or anodic carburizing was comparable. The surface roughness after cathodic carburizing increases more than after anodic one, but it can be reduced by 1.5 times by plasma electrolytic polishing.
Construction and operation of linear constructions at the polygonal land relief, in the conditions of distribution of permafrost soil
Authors: Fazilova Z 
Published: September 2020

Abstract
The purpose of this paper is a promising development of methods for the roadbed design in the conditions of polygonal terrain and the presence of underground ice (ice, formation and polygonal-vein underground ice) and the analysis of the perspective for the for railway construction Arctic Zone. The choice of a criterion is made, on the one hand, according to the to the data of daily survey practice and the relative ease of establishing indicators of natural conditions responsible for the development of subsidence, on the other hand, according to the most objective reflection of the conditions of the sedimentation process. As tools of engineering protection of an embankment body which is located in the territory of distribution of the polygonal relief (polygonal vein ice), it is offered to produce local thermal insulation of the soils of the foundation of the embankment body and the adjacent territory in order to preserve the ground ice in the frozen state.
Rank analysis of energy efficiency of diesel power plants of the Krasnoyarsk region
Authors: Panteleev V I , Sizganova E Yu , Petukhov R A , Pilyugin G A , Zilberman S M 
Published: September 2020

Abstract
On basis of the data provided by the Ministry of Industry, Energy and Housing Maintenance and Utilities of the Krasnoyarsk region a rank analysis of energy efficiency of municipally supervised diesel power plants on the criterion of diesel fuel specific flow was carried out. This made it possible to identify facilities with abnormal fuel consumption and to preliminary determine its causes. A recommendation was made to improve the energy efficiency of diesel power plants.
The study of variations in refractive indices of ZnSe single crystals in the range of 1.5-27 microns
Authors: Kotlikov E N , Novikova Yu A , Tereshchenko G V 
Published: September 2020

Abstract
The study of using new materials for the production of optical sensors, synthetic vision systems, and modern glasses with specified frequency polarization properties is impossible without their experimental research. Such research is focused on the further solution for the problems of synthesis or optimization of the technological process using accurate data on the parameters of a specific sample of production optical material. Here are the results of measurements and algorithms for processing the data obtained in order to estimate the refractive index of zinc selenide single crystals of the same ZnSe CVD type from different batches. A method for determining the refractive index is developed based on the spectrophotometric method using the reflection and transmittance spectra of plates, as well as the spectrum of the reflection from the sample surface. The results of the study showed not only the correctness of the proposed method. They also showed that in the studied part of the infrared range, the obtained refractive indices for different samples of zinc selenide from the same batch differ more from each other than indicated in reference publications. It should be taken into account when developing products of transmittance optics.
The role of bound water in the process of low-temperature oxidation of aluminum powders
Authors: Mostovshchikov A V , Ilyin A P , Korshunov A V 
Published: September 2020

Abstract
The processes of oxidation of aluminum powders with various particles size (micron and submicron samples) when heated in air were studied using differential thermal analysis. It was found that decreasing of particle size leads to an increase in the content of bound water in the form of hydroxides in the aluminum particles shells. The (hydr)oxides decompose with the release of water vapor when heated, and there is a local loss of continuity of the protective shells of Al particles, which contributes to the initiation of the metal oxidation process. In the temperature range of 350-600 °C, water vapor interacts with the surface of Al particles, resulting in the presence of hydrogen in the gas released from the thermal analyzer furnace. Based on a combination of data from thermal analysis, mass spectrometry and electron microscopy, it was shown that the main cause of the onset of oxidation of submicron Al particles was destruction of the (hydr)oxide shells due to intense gas formation at the metal core/shell interface due to the release of water vapor and hydrogen.
Dynamic plastic deformation of metal-matrix composites
Authors: Kaygorodov A S , Zayats S V 
Published: September 2020

Abstract
The mode of dynamic plastic deformation of metal-matrix composites based on aluminum and titanium is realized by the method of multiple magnetic-pulse pressing of powders. To obtain a different degree of deformation, the height of the compacts or the multiplicity of the pressing were varied. The initial powders with the “metal core - strong shell” structure were obtained by the method of electric explosion of the corresponding wires, followed by passivation. It was found that as a result of plastic deformation, these shells are destroyed and their fragments uniformly strengthen the metal matrix. This effect is enhanced by additional heating of the powder to 400°C during pressing. This approach makes it possible to increase the microhardness of pure Al and Ti by a factor of 5 to 1.2 and 5.7 GPa, respectively. In this case, the electrical resistance of aluminum and the plasticity of titanium composites are comparable with the corresponding characteristics of pure metals.
Transformations in aluminum oxyhydroxide under powerful short-pulse microwave radiation
Authors: Mostovshchikov A V , Ilyin A P , Korshunov A V 
Published: September 2020

Abstract
Modification of a material based on Al oxyhydroxide (boehmite/γ-Al2O3) with metal Al fragments (nanoparticles, clusters) has been achieved by the treatment of the material under powerful short-pulse microwave radiation (pulse duration 20 ns, pulse repetition 25 Hz, power density 8 kW/cm2, frequency 2.85 GHz, amplitude of the electric strength component ~2.5·106 V/m). The Al oxyhydroxide was precipitated from a mixture of AlCl3 with ammonia solution and heated at 250 °C for 4 hours. The prepared sample was of predominant amorphous structure, the overall water content (adsorbed, bound, structured) amounted to 15 wt.% in average. The microwave irradiation of the samples (1-3 min) resulted in formation of Al fragments smaller than 100 nm within the solid matrix. Formation of metal Al in the irradiated samples was detected by means of thermal analysis, X-ray diffraction, and transmission electron microscopy. The average content of Al in irradiated samples amounted to ~1.5 wt.%. A rational explanation of the observed metallization effect has been suggested.
Theoretical evaluation of the performance of greases with additives
Authors: Ostrikov V V , Sazonov S N , Vigdorowitsch M V , Koshelev A V , Khatuntsev V V 
Published: September 2020

Abstract
The formation of protective films under the action of additives on friction surfaces is a rather complicated process. In the first approximation, when the materials of the additive present in the lubricant interact with the substrate material, physicochemical processes should occur, as a result of which the near-surface structure of the metal changes, etc. The stability of a structured lubrication system depends on the strength of the structural framework, the forces of interaction between its individual particles, the dispersion medium at the interface, and the number of particle contacts per unit volume. The efficiency of the lubrication with additives from graphite and graphene components is considered. It was found that if we know the binding energy of 1 mole of the film and its thickness, it is possible to determine the separation pressure. As a result of a theoretical analysis of the processes occurring during the interaction of graphene particles with the surface of the substrate or metal, the dependence of the multiplier function on the number of layers in the film was established. An equation is obtained that characterizes the total area of separation of film fragments over the entire surface of the part, taking into account the pressure in the nodes and mechanisms and the stochastic nature of this phenomenon. It has been determined that the functioning of a new assembly or mechanism, pressure fluctuations are minimal due to minimal wear and optimal part tolerances. In the interaction of metal - metal additives, the electrons of the metal atoms are able to form an electron cloud in the crystal lattice, partially extending beyond the lattice. This can lead to the appearance of a dipole moment, the negatively charged pole of which is outside the metal lattice, and the positively charged pole is inside it. Metal nanoparticles that make up additives to lubricants, in contrast to graphenes, are nanosized 3D objects with a full-fledged crystal lattice, and therefore have higher dipole moments, which reduces the adhesive properties of the film, but in general does not contradict the known theories of their formation at certain conditions.
Electrical properties and fire resistance of LDPE/EVA/FLY ASH composite materials
Authors: Trong Vu Minh , Hoan Bui Dinh 
Published: September 2020

Abstract
This paper investigates the fire resistance and electrical properties of composite materials with a base polymer of ethylene vinyl acetate copolymers (EVA)-Low density polyethylene (LDPE) blending material and an additive of unmodified fly ash (FA) and modified by vinyltrimetoxysilane (MFA). The results of the fire resistance survey show that the LDPE/EVA/(FA and MFA) composite materials all have lower fire rates than the polymer blend LDPE/EVA. Fly ash particles have the potential to limit the combustion of organic polymers. Insulating properties and dielectric strength of LDPE/EVA/MFA composites are better than LDPE/EVA/FA composites. Unmodified fly ash and VTMS modified may partially reduce the insulation capacity of the polymer blend LDPE/EVA but remain within the requirements of good insulating materials.
Influence of temperature conditions on the shrinkage of wax patterns for investment casting
Authors: Nikitin K V , D’yachkov V N , Nikitin V I , Barinov A Yu , Deev V B 
Published: September 2020

AbstractThe study of free linear shrinkage of unfilled (PS50-50, MBC 3-T, Romocast 105, Romocast 152) and filled (Romocast 252, Romocast 325) model compositions for investment casting depending on the ambient temperature was carried out. It has been shown that unfilled model compositions have the greatest free linear shrinkage, and filled ones have the smallest. Moreover, the processes associated with free linear shrinkage proceeded in the samples for a long time (up to 24 h). This is probably caused by the duration of the polymerization processes and the low thermal conductivity of the model compositions. A change in the ambient temperature in the range from –5 to +35 °C has a significant effect on the linear dimensions of the samples from the studied model compositions. The length of samples from unfilled model compositions varies from +0.3 to –0.4%, and from filled ones from +0.2 to –0.15%. When samples from unfilled compositions cooled to –5 °C and subsequently heated to +20 °C, their initial length decreases on average by 0.2 mm, and at heating to +35 °C and subsequent cooling to +20 °C, it increases on average by 0.2–0.3 mm. At similar changes in ambient temperature, the dimensional change of samples from filled model compositions is not more than 0.1 mm.