bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanism of formation of intermetallic coatings by the Cold Spray Technology
Authors: Kiselev S P , Kiselev V P , Maximovsky E A , Vidyuk T A , Ukhina A V , Shikalov V S 
Published: December 2020

Abstract
In the present paper, results of a study of a TinAlm intermetallic coating obtained on the surface of titanium (Ti) by the method of Cold Gas Spraying (CGS) and heating to a temperature above the melting point of aluminum (Al) are reported. It is shown that the structure of the resultant coating depends on the heating temperature. At temperature T = 930K the coating consists of a TiAl3 intermetallic layer. At temperature T = 1270K a layered coating is formed. In this coating, a TiAl3 intermetallic layer, adjacent to the Ti surface, is followed by a second intermetallic layer consisting of Ti3Al and Ti2Al sublayers. The microhardness of the Ti3Al/Ti2Al double-layer coating proves to be three times higher than that of Ti. A qualitative explanation to the mechanism of formation of the layered coating is proposed.
Experimental study of the thermocapillary rupture dynamics of water and ethanol layers
Authors: Kochkin D Y , Zaitsev D V , Mungalov A S , Kabov O A 
Published: December 2020

Abstract
Rupture dynamics of thin (500 μm) horizontal liquid films of water and ethanol was experimentally investigated during non-uniform heating from the side of smooth substrate. On the same substrate under similar heating conditions, the propagation rate of a dry spot in a horizontal water film was found to be several orders of magnitude higher than the rate of propagation of a dry spot in an ethanol layer.
Determining thickness and optical properties of a-SiOx thin films by PUMA and envelope method
Authors: Merkulova I E 
Published: December 2020

Abstract
The gas-jet electron beam plasma chemical vapor deposition method was used for silicon suboxide (a-SiOx) thin films synthesis. According to the EDS data, stoichiometric coefficient of the films varied from 0.5 to 1.63 with changes in the flow rate of 5%SiH4+95%Ar gas mixture (R) from 89 to 18 sccm. Spectral transmittance, containing interference maxima and minima, was obtained in the range from 300 to 1000 nm. The refractive index and the thickness of a-SiOx thin films obtained from transmission spectra by the envelope method and PUMA were in good agreement with each other. The refractive index of the thin films at 650 nm increased from 1.6 to 3.1 and the film thickness changed from 500 to 1200 nm with an increase of R. The thickness values discrepancy for sample synthesized with R=18 sccm may be explained as the difficulty of using PUMA for systems with close refractive index of the film and the substrate.
Experimental study of oil displacement from a porous medium using nanosuspension
Authors: Minakov A V , Zhigarev V A , Pryazhnikov M I , Guzei D V 
Published: December 2020

Abstract
The paper presents the results of an experimental study of oil displacement by distilled water and an aqueous suspension of aluminum oxide nanoparticles. The correlation of extracted oil volume on the flow rate of the displacing fluid is obtained, and the pressure drop during the pumping of the displacing fluid through the rock sample is measured. It has been revealed that the suspension of nanoparticles can significantly improve the extraction of oil from sandstone.
Gas-discharge plasma diagnostics by a continuous spectrum of optical radiation
Authors: Pinaev V A , Isupov M V 
Published: December 2020

Abstract
In the present work, plasma diagnostics method based on the measurement and theoretical analysis of continuous emission spectrum of a gas discharge was discussed. Using the method, electron temperatures of a DC glow discharge and ferromagnetic enhanced inductive discharge were determined for inert gases in the gas pressure range of 20–200 Pa. Experimental results were compared with the results of numerical calculations for the ferromagnetic enhanced inductive discharge and DC glow discharge. A satisfactory agreement between the optically measured and numerically calculated values of electron temperature was shown.
Experimental study of heat transfer in two-phase flow regimes in rectangular microchannel
Authors: Ronshin Fedor , Dementyev Yuriy , Chinnov Evgeny 
Published: December 2020

Abstract
Existing cooling systems do not fulfil modern requirements for heat removal from high-heat dissipating sources in electronic and microelectronic equipment. When reducing the flat channel thickness, the ratio of the surface to the volume increases inversely to the minimal transverse size of the channel, resulting in high intensity of heat transfer in microsystems. Schlieren and infrared methods serve to determine the main characteristics of a two-phase flow. The characteristics of heat and mass transfer and regimes are studied at various values of the heat flux.
Distribution of ion velocity near an isolated dust particle
Authors: Salnikov M V , Sukhinin G I 
Published: December 2020

Abstract
In the current paper, a numerical model with self-consistent ion velocity distribution function calculated near an isolated dust particle is presented. This dust particle is under the influence of an external electrostatic field. As a result of calculation, ion velocity distribution function along an axis aligned with the external electrostatic field is obtained. The calculated data allows obtaining the set of parameters for which the approximation of the shifted Maxwell distribution function is applicable.
Graphene growth on the textured copper surface
Authors: Smovzh D V , Morozov V S , Kostogrud I A , Boyko E. V. E V 
Published: December 2020

Abstract
The effect of mechanical processing of copper foil on the single-layer graphene growth is studied. The deformation of the foil in the annealed and unannealed state is carried out by rolling between rollers with varying degrees of roughness. It is shown that the formed single-layer graphene coating on the foil deformed in the unannealed state has a larger number of defects, which is associated with the heterogeneity of the copper texture formed upon annealing. In the case of rolling the copper foil after the annealing stage, the quality of graphene coatings only slightly deteriorates in the deformed areas of foil.
Features of formation of a fluid flow flowing into a highly rarefied medium through a capillary
Authors: Yaskin A S , Zarvin A E , Kalyada V V , Dubrovin K A , Khudozhitkov V E 
Published: December 2020

Abstract
Experimental results of investigation of the form and structure of the flow of ethanol and propylene glycol into a highly rarefied medium (vacuum) through a capillary are presented. It is shown that when liquid flows vertically along gravity into a vacuum with a pressure of residual gases significantly less than the pressure of saturated vapors at the outlet temperature, the liquid jet, in contrast to the flow into a dense gas medium, is statistically unstable, subject to bending deformations and explosive spray.
Sound velocity in the vapor phase of the binary mixture R-125 (63.9 wt.%) – R-134a (36.1 wt.%)
Authors: Komarov S G , Stankus S V 
Published: December 2020

Abstract
Using an ultrasonic interferometer method, the sound velocity in gaseous mixture R-125 (63.9 wt. %) - R-134a (36.1 wt. %) was investigated in the temperature interval 303-393 K and pressure up to 0.95 MPa. The temperature measurement error was 20 mK, pressure 4 kPa, and sound velocity (0.2–0.3) %. It was shown that the sound velocity values increase with temperature and decrease with pressure. Comparison of our data with the calculations using the REFPROP software was performed.
Thermal expansion of vanadium in the temperature range of 98–2400 K
Authors: Kozlovskii Yu M , Stankus S V 
Published: December 2020

Abstract
The experimental results of a study of the thermal expansion of polycrystalline vanadium in the temperature range of 98–1723 K are presented. The correlation of the dilatometric data and γ-ray attenuation technique was established. The temperature dependence of thermal properties up to 2400 K was obtained and reference table of recommended values was calculated.
Heat capacity and phase transition of bismuth niobate doped by rare earth elements
Authors: Matskevich N I , Stankus S V , Samoshkin D A , Zaitsev V P , Tkachev E N 
Published: December 2020

Abstract
The heat capacity of bismuth niobate doped by rare earth elements (R = Er, Lu) was measured by differential scanning calorimetry. It was found that there were phase transitions for investigated compounds at temperatures > 500 K. The temperatures of beginning phase transitions increased with decreasing of rare earth elements radii, which correlated with an increase in lattice energies.
Equation of liquid, gas, and fluid state for methane
Authors: Meshalkin A B , Dutova O S 
Published: December 2020

Abstract
Using methods and approaches, previously developed by the authors, a new fundamental low-parametric equation of state for methane (in the form of the reduced Helmholtz function) has obtained to describe the thermodynamic properties. It allows describing the thermal properties of gas, liquid, and fluid at pressures of up to 20 MPa with sufficiently high accuracy close to the experimental one (with the exception of the critical region). The sound speed and caloric properties of methane have been calculated without involving any caloric data, with the exception of ideal gas enthalpy. The values of speed of sound, isochoric heat capacity, and other thermodynamic properties obtained by calculations are in good agreement with the experimental data.
Heat capacity of neodymium- and gadolinium-gallium garnets
Authors: Samoshkin D A , Stankus S V 
Published: December 2020

Abstract
In the present article an experimental study of neodymium- and gadolinium-gallium garnets (NGG and GGG) heat capacity was carried out by the method of differential scanning calorimetry. The measurements were performed in the temperature interval from 300 to 975 K, and the estimated error of the received data was 2–3%. The fitting equations for specific heat temperature dependences have been received. The table of recommended values for investigated gallium garnets heat capacity has been developed for the use in various theoretical and applied problems.
Approaches to simulate destruction of a fuel rod with different fuel types
Authors: Usov E V , Gafiyatullin A R , Klimonov I A , Chuhno V I 
Published: December 2020

Abstract
Due to the revival of interest to the development of fast reactors cooled by liquid metals, the theoretical research for improving their safety is actual. A detailed calculation of all stages of an accident from the beginning to the end requires knowledge of the laws for modelling physical processes occurring in the reactor in case of emergency. The most serious are accidents with core destruction. Simulation of a severe accident in a nuclear reactor is the key element in safety analysis of nuclear power plants. Destruction of fuel rods is one of the most important processes during core degradation that should be calculated. For different types of fuels the mechanisms of the degradation are different too. For example, oxide and metallic fuels usually melt congruently at high temperature, but nitride fuel dissociates. The main objective of the proposed research is to develop models and numerical algorithms for calculation of the destruction of fuel rods with oxide, metallic and nitride fuels. The models of destruction and some calculation results are presented in the paper. The processes are investigated for the first phase of severe accidents, covering the period from the onset of fuel-rod melting to the melt escape from the core center.
Experimental studies of the evolution of non-stationary natural convective boundary layers at different heat flux densities on a vertical wall
Authors: Berdnikov V S , Grishkov V A , Mikhajlov A V 
Published: December 2020

Abstract
The evolution of convective flow in a layer of ethyl alcohol with a free surface after sudden heating of one of the vertical walls of a rectangular cavity is experimentally studied. The evolution of a non-stationary hydrodynamic boundary layer on a heated vertical wall in time is studied using digital video recording and computer processing of video films. The evolution of the flow along the free surface of the liquid layer is investigated. Using a thermal imager, the time evolution of the temperature field on a thin metal vertical wall after the flow of a heated liquid is investigated.
Laser line scanning of a shape of moving objects with various degree of transparency
Authors: Mel’nik A V , Seredkin A V , Tokarev M P , Gobyzov O A 
Published: December 2020

Abstract
Laser scanning methods for surface geometry reconstruction have become a common tool in many areas of application due to relative simplicity, high accuracy, and versatility. Nevertheless, scanning of glossy or translucent surfaces still poses a problem for these techniques. The present work aims at assessing the applicability of the laser line scanning method for evaluation of the height profile of a waste stream on a conveyor belt, taking into account that the waste stream may contain a large number of semi-transparent objects. In particular, preliminary results of height profile measurements with regard to the laser emission wavelength for polyethylene terephthalate (PET) bottles with various degrees of transparency, common in the municipal solid wastes, are reported in the paper.
Unsteady conjugate convective heat transfer in a vertical channel at a sudden heating of the bottom
Authors: Mitin K A , Mitina A V , Berdnikov V S 
Published: December 2020

Abstract
The processes of unsteady heat transfer in the mode of thermogravitational convection in a vertical channel with solid walls of finite thermal conductivity after a sudden heating from bottom was studied numerically by the finite element method in three-dimensional problem statement. The system of thermogravitational convection equations was solved in the Boussinesq approximation in the variables of vortex–vector potential of the velocity field and temperature. The calculations were performed with the Prandtl number of 10, the Grashof number of 5000, and the ratio of the thermal conductivity of solid walls to the thermal conductivity of the liquid equal to 6.29. Distributions of the unsteady temperature field into the liquid and solid walls, temperature gradient fields, and velocity fields in the liquid were obtained. The process of formation, loss of axial symmetry and subsequent development of the rising stream was shown.
Effect of thermal conductivity of thin walls limiting the inclined liquid layer on non-stationary conjugate natural convective heat exchange and temperature fields in thin walls
Authors: Mitin K A , Mitina A V , Berdnikov V S 
Published: December 2020

Abstract
Non-stationary conjugate convective heat transfer in a rectangular cavity at an angle of 45 degrees is studied numerically in the conjugate formulation. A liquid layer with a Prandtl number of 25.66 is located in a cavity with thin metal or low-heat walls. The outer surface of the lower wall is suddenly heated, and the outer surface of the upper wall is maintained at the original temperature. The system of equations of non-stationary thermogravitation convection is solved in the Boussinesq approximation in a dimensionless form. The time evolution of convective flows and temperature fields in the liquid and in the walls is studied. It is shown that the thermal conductivity of walls significantly affects the spatial shape of convective flows and the regularities of conjugated convective heat exchange.
Analysis of Mechanical Design Manufacture and Automation Characteristics, Advantages and Development Trends
Authors: Wei Li 
Published: December 2020

Abstract
Mechanical manufacturing design is an important direction in the field of automation in China which promotes the development of China’s productivity and economy. Based on this, this paper discusses the advantages and trends of automation in mechanical manufacturing so as to improve the efficiency of machinery manufacturing and promote economic development. Therefore, it is hoped that this paper can provide some references for related researchers.
Post-Processing Design and Application of Inconel 718
Authors: Li Yinxuan 
Published: December 2020

Abstract
Inconel 718 is a Ni-based superalloy, usually used for aircraft engine because of its high temperature properties and oxidation resistance. According to the current experiments, most experiments are done through the traditional manufacturing. Recently, the additive manufacturing, also called 3D printing, has been regarded as a new manufacturing that is used in the experiment. Different manufacturing causes the different orientation and segregation, and leads to different results with traditional manufacturing. Besides, the design for the heat treatment is always the point that researchers are looking for. The conventional method is homogenization and ageing, but some researchers have tried the direct ageing to find the differences. This paper focuses on the influence of temperature, time of the heat treatment and the effect of manufacturing method. It is concluded that the manufacturing method can influence the best choice of heat treatment. What is more, the additive manufacturing with high temperature homogenization and ageing is a good method in the experiment but it is hard to use in the industry now. Through the research of various factors, it is helpful to find a better method to improve the properties of Inconel 718 during the application.
Research on the SH-CCT and PWHT of improved new type SA738 Gr. B nuclear power steel
Authors: Jianlin Zhang , Ping Zhu , Xunuo Yang , Gangang Wang , Jiancang Zhao 
Published: December 2020

Abstract
The Gleeble-3180 machine is used to determine the simulated HAZ continuous cooling transformation (SH-CCT) curves of improved new type SA738 Gr. B nuclear power steel by expansion method, metallographic method and hardness method. The t8/5 time increase from 5 s to 6000 s and the influence of cooling rate on microstructure and phase transition are analyzed. The hardness changes before and after tempering treatment are compared with the samples so as to analyze the process and function of tempering. This reasearch provides theoretical and data support for improving welding technology and promoting the development of nuclear steel.
Microstructures and Hardness Changes of Au0.1Be Under four Strengthening Methods
Authors: Li Juzi , Zhao Linqi , Lu Li 
Published: December 2020

Abstract
With the epidemic of coronavirus pneumonia (COVID-19) worldwide gold price reaches to a new heights, which inevitably increase the costs of gold products especially jewelry industry. The jewelry industry including other industries need harder gold based microalloy to produce more delicate, more light but bigger size gold products. We prepared 3 gold based micro-alloys --Au0.1Li,Au0.1Be and Au0.1B an tested that Be is the most effective element in strengthening fine gold. With the o.1wt.% Be additions the hardness of fine gold is improved from 30HV to 69HV and the grain sizes of fine gold are significantly refined from the the range of 300 -700um to the range of 6-30um. Thereafter, work hardening, Supercooling testing, Heat Treatment and Nitrogen Ion Implantation testing were applied to see how they influence the hardness and microstructures of Au0.1Be.
Computational fluid dynamics study of magnetic liquid rotary seal for sealing liquid
Authors: Wang Hujun 
Published: December 2020

Abstract
When applied in sealing liquid, the instability of the interface between the magnetic liquid and the sealed liquid in the direct-contact magnetic liquid seal structure will occur and increase, eventually leading to the failure of the magnetic liquid seal. In order to understand the destruction process of the interface between the magnetic liquid and the sealed liquid more intuitively, the two-phase flow of the magnetic liquid and the sealed liquid was simulated numerically. Phase distribution and velocity distribution are obtained through the simulation.
Study on the Material Properties of Inorganic Silicate Coating and Protective Effect on Ship Metal Structure
Authors: Xia Cheng , Dong Kehai , Lai Shuaiguang , Zhang Tong , Yu Hongbo 
Published: December 2020

Abstract
In order to verify whether the coating can meet the stringent requirements of the ship’s long sailing cycle, harsh environment, and various unfavorable factors such as fire conditions, physical and mechanical performance tests, endurance tests, and Micro and micro tests of the three coating samples were carried out. The hardness of the ZS2000, ZS hybrid and ZS1000 coatings measured by the experiment were ⩾8H, ⩾7H, ⩾3H, respectively; the thermal conductivity values of the three coatings are very low, respectively 0.074 W/(m·K), 0.034 W/(m·K) and 0.025 W/(m·K), which can meet the requirements of the engine in unexpected flame environment; the original adhesion of the coating is the best, but the adhesion of the coating is reduced after the damp heat cycle and the salt corrosion at room temperature, and the salt spray resistance, damp and heat resistance of the coating are good, and no obvious defect is observed; TG experiments have found that the remaining percentages of the three coatings ZS1000, ZS2000, and ZS hybrid are 85.29%, 80.72% and 77.90% respectively. The thermal stability of ZS1000 is the best, and the three coatings have the best remaining balance. The difference is not large, so they all have good thermal stability. Analyzing the results of a series of performance tests, it is found that the comprehensive performance of the ZS hybrid coating is better than that of the ZS2000 and ZS1000 coatings.
Buckling analysis of composite laminates with a circular hole
Authors: Zhang Cong , Bai Ruixiang , Lei Zhenkun , Sun Zhenya , Su Kang 
Published: December 2020

Abstract
The stress concentration will appear at the edge of the hole of composite laminate after the openings, which will affect the buckling load and bearing capacity of the composite laminate. Generally, a local reinforcement near the hole is an effective method to alleviate the concentration near the hole and improve the bearing capacity of the structure. In addition, the curvilinear fiber laying scheme is tried to solve the stress concentration problem in this paper. Therefore, the finite element models of ordinary composite laminates with a circular opening, variable angle composite laminates with an open-hole and composite laminates with reinforcement near the circular hole were established by ABAQUS software, the buckling analysis and progressive damage analysis of the above models under shear load were carried out considering the Hashin damage failure criterion and Camanho stiffness degradation criterion. By comparing the buckling load and ultimate load of three different kinds of composite laminates with a circular hole, it is found that besides composite laminates with reinforcement near the circular hole, the curvilinear laying laminates can also increase the stiffness of the laminates and improve the buckling load and ultimate bearing capacity of the structure.
Microstructure and cryogenic toughness of 316LN austenite stainless steel weld metal welded by NG-MAG arc welding
Authors: Liang Li , Wenkai Xiao , Jiaqi Zhai , Yalu Zhao 
Published: December 2020

Abstract
Using narrow-gap Metal Active Gas (NG-MAG) arc welding, the low-temperature impact toughness and microstructures of the 316LN welded joints have been researched and characterized by Charpy impact test, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results show that the low temperature toughness in the as-welded state is 132J and the toughness of the post-weld heat treatment was 112J. There are many dimples in the impact fracture, which indicated plastic fracture. The ferrite is located at the austenite grain boundary and exhibits a strip shape with a width of about 400 nm.