bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermocapillary waves formation at the interface of hydrocarbons and graphene-like nanofluids
Authors: Paharukov Y V , Shabiev F K , Safargaliev R F , Ezdin B S , Zarvin A E , Kalyada V V 
Published: December 2020

Abstract
The paper presents the study of supramolecular structuring forming a transition region at the hydrocarbon – nanofluid interface resulting from synergistic effect by the interaction of multilayer graphene planar nanoparticles and silicon carbide nanoparticles covered with graphene layers (Core-shell). During the film formation on the interphase, filamentous formations were obtained, which resulted from interaction with thermocapillary waves. It was found that the structure of the filamentous formation was influenced by the composition and concentration of nanofluids.
Transport processes in Newtonin and non-Newotonian fluids and fluctuation-dissipation theorems
Authors: Rudyak V Ya 
Published: December 2020

Abstract
The subject of this paper is molecular modelling of the transport processes in liquids including nanofluids. The weak and strong nonequilibrium processes are considered. In the first case, the corresponding fluctuation-dissipation theorems are formulated. These theorems determine the relation between the dissipative processes and equilibrium thermal fluctuations of the mass, momentum, and energy in the molecular system. Two different formulations of these theorem are discussed in detail. Various systems are considered: molecular liquids, nanofluids, turbulent liquids, fluids in confined conditions, and microviscosity in biomembranes. In the last part the nonlinear transport processes and rheology of the non-Newtonian fluids are discussed.
Sn filament formation under arc discharge sputtering of SnO2/C electrode
Authors: Zaikovskii A V 
Published: December 2020

Abstract
As a result of electric arc sputtering of a composite SnO2/C electrode in a rarefied helium medium, the formation of tin fibers reaching a length of more than 20 μm was discovered. The length of the formed fibers depends on the distance from the arc discharge to the area of deposition on a graphite substrate. The formation of tin fibers is influenced by such factors as the temperature of the gaseous medium and the partial pressure of tin vapor.
Density and thermal expansion of silver in the solid and liquid states
Authors: Abdullaev R N , Khairulin R A , Stankus S V 
Published: December 2020

Abstract
Density and thermal expansion of pure silver are investigated using a gamma-ray attenuation technique in the temperature range of 293–1631 K of solid and liquid states. The relative density change of silver during the solid–melt phase transition is directly measured. The approximation dependences for the density are constructed and the data of this work are compared with the results of other authors. Tables of temperature dependences of the volumetric properties of silver are developed over the entire measurement interval and their errors are estimated.
Thermophysical properties of ML5 casting magnesium alloy
Authors: Agazhanov A Sh , Samoshkin D A , Kozlovskii Yu M , Stankus S V 
Published: December 2020

Abstract
In the present work thermal conductivity, thermal diffusivity, heat capacity, melting enthalpy, and linear thermal expansion coefficient of ML5 casting magnesium alloy were investigated in the temperature range of 298–670…925 K. The measurements were performed using laser flash method, dilatometric method and differential scanning calorimetry on the samples made from the one initial material. Using the obtained data, the temperature dependence of the thermal conductivity was determined. For all studied properties the approximation equations were obtained which can be used for various scientific and practical applications.
Phonon density of states and thermodynamic properties of La2(C11H19O2)6
Authors: Musikhin A E , Bespyatov M A 
Published: December 2020

AbstractBased on the low-temperature heat capacity a set of properties of dimeric lanthanum dipivaloylmethanate were obtained. The phonon density of states was calculated, and characteristic temperatures related to the basic moments of the density of states were obtained. The molar thermodynamic functions at constant volume (heat capacity, entropy, internal energy increment, and Helmholtz energy) in the temperature range of 0–455 K were calculated. The molar zero-point energy and total internal energy were calculated.
Thermal conductivity of R-32/R-125 (40/60 wt. %) mixture in the vapor phase
Authors: Raschektaeva E P , Stankus S V , Verba O I 
Published: December 2020

Abstract
The gaseous thermal conductivity of binary mixture of R-32/R-125 (40/60) was measured with a coaxial cylinders method in the temperature range of 305–426 K and the pressure range of 0.1–1.8 MPa. The thermal conductivity as a function of pressure and temperature was considered. The correlations for thermal conductivity on dew line and in ideal gas state are presented.
Numerical study of non-stationary radiation-conductive ice heat transfer taking into account radiation scattering
Authors: Sleptsov S D , Savvinova N A , Grishin M A 
Published: December 2020

Abstract
A numerical study of the formation of the temperature field and the melting rate of a layer of ice scattering radiation vertically located on an opaque substrate during radiation heating has been carried out. To solve the radiation part of the problem, a modified method of average fluxes is used, taking into account the volume absorption and scattering of radiation into the medium, as well as the selective nature of the radiation source. Anisotropic scattering radiation is taken into account by the method of expanding the scattering indicatrix in a series according to Legendre polynomials. The effect of the spectral volumetric properties of ice on the melting and temperature increase of the non-irradiated side is presented. Comparison of calculation results with experimental data demonstrates satisfactory agreement. The proposed method for taking into account anisotropic scattering does not show any significant difference from isotropic scattering.
Evolution of non-stationary boundary layers in a vertical liquid layer in the regime of conjugated natural convective heat exchange
Authors: Mitin K A , Mitina A V , Berdnikov V S 
Published: December 2020

Abstract
The evolution of non-stationary boundary layers under monotonous heating to a given temperature of the outer surface of one of the walls of a vertical liquid layer is numerically studied. The finite element method is used to solve a system of equations for unsteady thermogravitation convection in the Boussinesq approximation in terms of vortex, stream function, and temperature. The process of formation of non-stationary boundary layers on the heated wall is studied depending on the layer height. In a two-dimensional conjugate problem statement, distributions of non-stationary temperature and velocity fields in a liquid with a Prandtl number of 10 are obtained. Distributions of non-stationary temperature fields in mirror glass walls and temperature gradients on the walls are obtained as well. The calculations are made for the Rayleigh number equal to 106.
Numerical simulation of non-Newtonian hydrodynamics in an annular channel with tool joint
Authors: Orlik E , Bocharov O , Gavrilov A 
Published: December 2020

Abstract
The paper presents the simulations of the local and integral characteristics of an annular flow with tool joints, depending on problem parameters. The structure of the flow in the vicinity of the coupling, in the areas of stagnant and reverse flow, is studied in detail. The characteristic length of separation and stabilization zones, i.e. the distance behind the joint where the flow reaches steady-state again is investigated. The sizes of pipes and tool joints in the study match those used while drilling. The numerical modelling is performed in 3D steady-state formulation for both laminar and turbulent regimes using original in-house software.
Thermal Conductivity of Graphene and Its Applications on Heat Spreading Materials
Authors: Li Yunhui 
Published: December 2020

Abstract
Graphene consists of a single layer of carbon atoms arranged in two-dimensional hexagonal lattice. This research set up model of graphene with heat source and sinks to visualize the movement of carbon atoms. Moreover, molecular dynamics simulations were tools to study the thermal conductivity of graphene and other properties of a material. The result shows that the thermal conductivity of graphene in the room temperature is relatively high among the existing materials. Various possibilities for its application will be briefly discussed, mainly focused on heat spreading materials. At last, there will be a discussion about graphene’s future development.
Research on the Application of Agricultural Engineering Technology in Agricultural Modernization
Authors: Zhang Heyi 
Published: December 2020

Abstract
In recent years, with the rapid improvement of China’s science and technology level, China’s agricultural engineering technology has also made considerable progress. The development of agricultural engineering technology provides an important technical foundation for the realization of agricultural modernization, especially in the effective use of agricultural resources, the improvement of agricultural labor productivity, and the transformation of agricultural production and operation methods. Therefore, we must increase the promotion and application of agricultural engineering technology in various agricultural production and operation activities. This will help promote the gradual development of China’s agricultural production in the direction of mechanization, automation, informationization and intelligence, so as to fully realize the modernization of China’s agriculture.
Research on the Design of Cultural and Creative Products in Southern Fujian Based on Narrative Design Methods
Authors: Zhou Xiaoping , Lian Xiaobo , Guo Huiting 
Published: December 2020

Abstract
Narrative design method is an important form of cultural creative design. An important manifestation of the combination of traditional culture and modern culture is cultural creative products. Southern Fujian cultural elements are unique and have an important position in Chinese culture. Combining southern Fujian cultural elements with modernity and carrying out cultural and creative design will help promote the innovative development of traditional Chinese culture. Based on this, this article analyzes Minnan cultural and creative products.
Self-Assembly of Janus Type Amphiphilic Dendrimers from Dissipative Particle Dynamics Simulation
Authors: Yan Wenyuan 
Published: December 2020

Abstract
The self-assembly of Janus type amphiphilic dendrimers has been studied extensively through experiments and computer simulations, while most of the simulations assume that Janus molecules are connected by covalent bonds, disregarding the noncovalent interaction which evokes the particular dynamic self-assembly regulation. This paper investigates the dynamic self-assembly behavior of Janus type amphiphilic dendrimers through the dissipative particle dynamics (DPD) method. A series of coarse-grained models of Janus type amphiphilic dendrimers with different hydrophobic-hydrophilic ratios were constructed to simulate the static self-assembly, and then the dynamic self-assembly was carried out through introducing a chemical bonding reaction to simulate the non-covalent interaction between the two different parts of Janus type dendrimers. The control of reaction rate was accomplished by modifying the reaction probability to adjust the dynamic self-assembly process. The results indicate that the introduction of non-covalent interaction changes the self-assembly behavior of some models and generates different dynamic self-assembly structures. It can also be deduced that the reaction rate exerts influence on the structure of dynamic self-assembly.
Dynamic Analysis and Structure Improvement of Timing Chain of an Engine
Authors: Chen Yajuan 
Published: December 2020

Abstract
Based on the dynamic theory, taking the timing chain system of an engine as the research object, the dynamic characteristics of the contact force between the chain and the components, the swing of the chain and the friction work at idle speed of the chain are analyzed respectively. And the influence of the structural design parameters on the abnormal noise of the engine is obtained. Thus, the optimization scheme of the timing chain system is proposed according to the analysis results.
Distribution of Inclusions in 18CrNiMo7-6 Steel Billet and Its Relationship with Inclusion Compositions
Authors: Wang N. , Fang C.F. , Zhao L. , Huang K. , Wang R. , Wang J.M. , Hao H. 
Published: December 2020

Abstract
The 18CrNiMo7-6 steel billet was prepared by the process of EBT→LF→VD→die casting and forging. The position distribution, composition, type and cause of inclusions in the billet were statistically analysed by ASPEX and scanning electron microscopy. The results show that there are obvious distribution differences of inclusions in different parts of the steel billet. In contrast, the number density of inclusions in the billet corresponding to the ingot riser and the negative segregation zone is higher; the average composition point of the inclusions in the slow cooling zone tends to be distributed in the higher temperature zone of the MgO-Al2O3-CaO ternary phase diagram.
Effect of heat treatment on microstructure, hardness and electrical conductivity of as-extruded ZK80 Mg alloy
Authors: Cao Fenghong , Qin Zhaohui , Chen Chang , Xu Yaohui , Huang Lanxiang 
Published: December 2020

Abstract
The microstructure, hardness and electrical conductivity of as-extruded ZK80 Mg alloy were tested and analyzed by means of microscope, XRD, electrical conductivity and Rockwell hardness tester. The results show that: as-extruded ZK80 Mg alloy has good aging strengthening effect, the change trend of hardness and electrical conductivity of the alloy is the same, that is, the hardness and electrical conductivity of that alloy show a strong linear correlation, with the extension of holding time, the hardness and conductivity increase in an oscillatory manner, and then decrease after reaching the peak value. The relationship between hardness and conductivity is g = 1.06418h-52.29795, and the experimental fitting effect is good.
Crack Corrosion Simulation of H62 Copper Alloy Coating Under Damage Condition
Authors: Tong Zhang , Wentao NIU , Qing Dong , Cheng Xia 
Published: December 2020

Abstract
Objective To study the crevice corrosion under the condition of damaged coating. Methods The simulation was carried out by using COMSOL software. The influence of the distance between the damage zone (W) and the gap width (H) of the damage zone was discussed. As a result, the corrosion enters the stable corrosion stage after a very short initial stage, and the current is much longer than the stable stage in the initial stage. The electrolyte potential and the electrode potential are completely different in the initial and stable stages; the anode reaction occurs uniformly in the damaged area, and the cathode reaction focuses on the crack mouth in the stable stage; the increase of W and H is aggravated by corrosion, but when W is greater than 0.7mm, the effect is very weak and can be considered to be stable. Conclusion The crevice corrosion under the condition of coating damage is the corrosion controlled by the cathode oxygen reduction reaction. The oxygen is quickly consumed in the initial stage and cannot be replenished. The cathodic reaction is mainly concentrated in the crack mouth. The change of W at small time will affect the corrosion. The increase in H will exacerbate corrosion.
Analysis on Evaluation Method for Support Equipment System Effectiveness
Authors: Yue Deng , Chao Hou 
Published: December 2020

Abstract
In order to study the applicability of evaluation method in the process of service support equipment effectiveness evaluation, this paper selects several kinds of evaluation method which are widely used in the field of equipment effectiveness evaluation, summarizes their basic ideas and general steps, analyzes the application of each evaluation method in the process of service support equipment effectiveness evaluation, and provides a theoretical reference for the practical application of logistics support equipment system effectiveness evaluation method.
H2Ti3O7 Nanorods Synthesized H Cation-exchange in Na2Ti3O7 for Stable Sodium Storage
Authors: Li Cheng , Jiang Ying , Li Zehua , Zhang Yixin , Xie Man 
Published: December 2020

Abstract
To overcome poor interfacial stability and slow ion transport rate of Na2Ti3O7, H2Ti3O7 nanorods are synthesized by acidification of Na2Ti3O7 with low concentration of strong acid. The dominated pseudo-capacitive behavior significantly improved rate capability with fast electron and ion storage kinetics. When used as anode for sodium-ion batteries, H2Ti3O7 delivers a stable specific capacity of 103.5 mAh g-1 after 500 cycles with a capacity retention rate of 49.3%, and high rate performance (70.5 mAh g-1 at 2 A g-1).
Dynamic analysis of main transmission mechanism of high-speed cold heading machine based on rigid-flexible coupling model
Authors: Teng Xinyi , Li Guoping , Zhang Xiangfang , Yao Yi 
Published: December 2020

Abstract
In the research of high speed cold heading machine, only single part is studied. The interaction between the components of the main drive mechanism is rarely studied. The motion of the main transmission mechanism of the cold heading machine was analysed. The interaction between the components of the main transmission mechanism was studied. This article adopts the theory of multi-body system dynamics. The rigid-flexible coupling model of the main transmission mechanism was established. The dynamics and kinematics simulation of the main transmission mechanism was carried out. The motion curve and stress of the rigid-flexible coupling model are obtained. Compared with the rigid model, the rationality of the rigid flexible coupling model was demonstrated. It provided a reference for further fatigue analysis and optimization of the main transmission mechanism.
Sustainable design of the GUST small wind turbine
Authors: Zawadzki Karol , Baszczyńska Anna , Stępień Małgorzata , Fliszewska Angela , Molenda Szymon , Pisarski Marcin 
Published: December 2020

Abstract
One of the increasingly important criteria, when constructing a Small Wind Turbine (SWT), is its sustainable design. It means constructing the SWT in such a way that it can provide a cheap, easy and safe access to clean energy at a specific location for predicted number of consumers. This paper highlights three issues. First, benefits from the application of the rapid prototyping technology are discussed. 3D printers can be used as a durable and relatively cheap means of SWT components production. Also, the possibility of using recycled plastic for 3D-printed components is of big importance. Secondly, the modular construction of the small wind turbine is outlined. This facilitates the product versatility, proneness to adjustments and ease of maintenance. Last but not least, the production costs for individual units as well as multi-unit production are reviewed to show the financial benefits of SWTs and the payback of such investments over the years. The article concludes with a set of recommendations for wind turbine design, conformal with the suggestions of the UN Sustainability Report and Sustainable Development Goal 7.1. The utilization of described concepts is demonstrated basing on the GUST 1.6 m diameter horizontal axis SWT.
Loading on the carrying structure of a flat wagon when transporting firing military equipment
Authors: Fomin O , Vatulia G , Lovska A 
Published: December 2020

Abstract
The study deals with research through mathematic modeling of the dynamic loading on the carrying structure of a flat wagon in transportation of military equipment conducting fire. A 13-401 flat wagon loaded with a tank with combat load of 55 tons was taken as the prototype. The mathematical model was solved in MathCad software. It was established that the maximum acceleration on the carrying structure of a flat wagon in the horizontal plane was about 40 m/sec2, and in the vertical plane – about 10 m/sec2. The values obtained were considered in strength calculation for a flat wagon. The calculation was made using the finite element method in CosmosWorks software. It was established that the maximum equivalent stresses in the carrying structure of a flat wagon exceeded the admissible values twice. The results of the study will encourage engineers to design carrying structures of flat wagons intended for transporting military equipment firing in motion
Study of the operation of taxi cars in an emergency situation
Authors: Grozev Dimitar , Georgiev Ivan , Georgiev Dimitar 
Published: December 2020

Abstract
This paper examines the transportation work of taxi companies operating in the city of Ruse in an emergency situation caused by the COVID-19 epidemic when the number of requests for taxis decreased by 60%, about 30% of drivers stopped working due to reduced workload. The aim of the present study is to identify changes in their work intensity. The taxi operating system is modelled as a queuing system with failures with non-stationary incoming flow of requests and a variable number of service channels. After collecting and processing statistical information about the received requests, the incoming flow is modelled as a periodic nonlinear function. The main parameters of the study are: density of failures, average number of taxi cars occupied per day and intensity of serviced requests. The object of the study is a full working day of 24 working hours, taking into account the reduced intensity of transportation work. Even at the highest peaks the load coefficient is below 0.1, which means that in the intervals with the highest load, the service occupancy is below 10% of those working at the moment. In the interval from 0:00 h to 7:00 h a load factor slightly above 0.04 is observed. An application has been created in the environment of MATLAB.
Experimental study of the flame propagation of gaseous fuel based mixture using optical visualisation
Authors: Hristov R , Stefanov S , Dimitrov R 
Published: December 2020

Abstract
At this article presents experimental investigations carried out to determine the flame kernel propagation of gaseous fuel-air mixture under spark-ignition engine-like conditions. Various combustion processes taking place in an experimental combustion chamber are discussed. Consecutive shots of the development of the fuel flame front in a constant volume combustion chamber under different initial conditions are presented. Direct visual recording of an image of the combustion process is performed or Schlieren photography techniques are used. Modern types of spark plugs with different gaps in the entire price range are examined. CNG and LPG are used as gaseous fuels, since they are the main alternative fuels used in internal combustion engines for vehicles. Some of the results, such as pressure, maximum pressure and electric spark indicators, are shown as graphics. To calculate the speed of the flame propagation, specialised software processing the areas of the individual photos was used. The conclusions emphasize the results of relative air/fuel ratio, most favourable type of spark plugs and their gaps and location in the combustion chamber.