bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exergy analysis of the potential of solar irradiation
Authors: Khoreva V A , Elistratov S L 
Published: December 2020

Abstract
In the study, determining the input value of the exergy of solar irradiation entering the frontal surface of the solar collector has become an issue. Several sources of information have been studied, and then a calculation method has been proposed. The article presents the calculation of the input exergy value for the exergy analysis of the solar irradiation potential. The result of the work performed is a computing program that calculates the solar energy supplied to the solar collector and can be used at any latitude and altitude above sea level.
Steam condenser for plants with carbon dioxide recovery
Authors: Milman O O 
Published: December 2020

Abstract
Power plants with CO2 utilization have been designed by Allam, Mateant, Turbocon, etc. One of the main problems of this plant is a condenser for steam-gas mixture with high concentration of non-condensable gas. The process of development of steam condenser for steam-gas mixture is described. Its design is based on the idea of maintaining a constant steam-gas mixture velocity along the steam condensation channel. The shape of the channel with constant SGM velocity is described. To research the heat-mass transfer of gas-team mixture the test plant with tubes crosscut by thermocouples is realized. In the process of testing, gas-steam mixture velocity, pressure and air concentration changed from 0% to 18%. The experimental results have been summarized in a dimensionless equation. The pressure drop and increase of air concentration contribute to the decrease of saturation temperature. The optimal velocity is reached when the surface area of the channel in the condenser is minimal. The optimal velocity is about 30 – 50 m/s. The research results are implemented in the experimental model of high-efficiency condenser. The heat transfer coefficient in this model is equal to about 4500 – 2700 W/(m2K) if air concentration at the inlet is 0–8 %. The designs of high-efficiency condenser for gas-steam turbine plant of 25 MW capacity and the condenser with vertical tubes have been presented.
Energy Potential of Wastewater Sludge: Economic and Ecological Efficiency
Authors: Plyaskina N I 
Published: December 2020

Abstract
Recently, many major cities in the world have faced a serious environmental problem caused by the presence of a large amount of waste and the established practice of their treatment. The paper presents an assessment of the energy potential of wastewater sludge (WWS) in the context of Novosibirsk city. According to our estimates, the total amount of generated semi-liquid WWS is about 132,000 tons per year, the theoretical energy output amounts to 67 GW per year, which is more than three times the total heat produced by small boiler plants in the region. Chemical compositions of WWS and stone/brown coals differ slightly. WWS contains 24.5% less carbon than coal and 5% less carbon than brown coal. The proportion of sulfur in WWS exceeds its specific content in coal by only 0.2% and in brown coal – by 4%. Seven alternative wastewater sludge utilization options have been developed, based both on new non-traditional waste incineration technologies and on finished turnkey technologies. WWS utilization options are evaluated in terms of economic efficiency, energy value, and environmental impact. The efficient option is the one associated with the utilization of WWS based on combustion with coal in a thermal power plant.
Water vapor thermal plasma generation
Authors: Anshakov A S , Radko S I , Urbakh A E 
Published: December 2020

Abstract
The results of studies of an electric arc plasma torch for heating water vapor are presented. For the first time, a structural diagram of a steam-water thermal plasma generator with copper electrodes was implemented. The energy characteristics of the plasma torch and erosion of the electrodes reflect the features of their behavior during combustion in a plasma-forming medium of water vapor. The results obtained indicate the promise of the developed design of the steam-water plasmatron.
An experimental investigation of the heat transfer dynamics during evaporation of a single liquid drop on a sapphire substrate
Authors: Cheverda V V , Ponomarenko T G , Marchuk I V , Karchevsky A L 
Published: December 2020

Abstract
The paper is devoted to an experimental study of the heat transfer dynamics during evaporation of a single liquid drop on a heated horizontal surface, which is a sapphire glass coated with a high heat-resistant black graphite paint. The method employed in research can be used to study the heat and mass transfer processes in the gas-liquid-solid contact line region with maximum heat transfer coefficient. Its particular feature as compared to the previously known methods is the solution of the initial-boundary problem for the heat conductivity equation, which in terms of mathematics is a correct problem. Using the thermography method, the sapphire surface temperature fields after single drop impingement are determined. The data obtained will be used to calculate the heat flux density in the region of the contact line of the drop.
Numerical investigation of the effect of insulator permittivity on the initial stage of dielectric barrier discharge
Authors: Hrebtov M Yu , Bobrov M S 
Published: December 2020

Abstract
We present a numerical simulation of the simplified ferroelectric plasma source operating in a gas discharge mode. The plasma source contains two electrodes separated by a ferroelectric. High voltage pulse applied to the cathode leads to formation of a dielectric barrier discharge in gas (argon at 1 Torr pressure). The main point of the study is to clarify how the high permittivity of the ferroelectric affects the initial stage of the discharge. Two cases are considered with different values of barrier relative permittivity. The results show that the process of compensation of bound charge affects the electron avalanche formation near the dielectric surface. The electron concentration in the avalanche drops down for materials with higher permittivity.
Evaporation of micro-sized droplets on a heated silicon substrate
Authors: Kunts K A , Kirichenko D P , Bykovskaya E F , Zaitsev D V , Kabov O A 
Published: December 2020

Abstract
The present research is devoted to the evaporation of micro-sized water droplets on a smooth silicon substrate heated from below. The study of this process is relevant for the development of spray cooling systems. Due to the extreme complexity of this phenomenon the mechanism of spray cooling is not fully understood yet. In our experiment the silicon substrate is open to the atmosphere. Evaporation of sessile droplets with the size of the order of 10 μm is studied at the substrate temperature ranging from 23 to 100°C. A shadow method coupled with a high-speed camera is used in the experiment to determine the geometric characteristics of the droplet profile and to calculate the droplet evaporation rate.
Spatial velocity distribution around an endless chain of spherical dust particles
Authors: Salnikov M V , Sukhinin G I 
Published: December 2020

Abstract
This paper presents a numerical model in which selfconsistent distributions of plasma space charge, ion velocity and potential are calculated in a proximity of the infinite chain consisting of spherical dust particles. In the observed model this chain is under an influence of an external electric field. As a result of calculation spatial distributions of ions velocity and plasma potential around the isolated dust particles are obtained. The data obtained reveal that for the electric field of low intercity local maximum in the potential and velocity distribution linearly increases with the rise of the external field strength. However, with further amplification of external electric field the potential maximum starts to decline in contrast to the velocity local maximum.
Caloric properties of Cs60Bi40 alloy in the temperature range of 293-1125 K
Authors: Khairulin A R , Stankus S V 
Published: December 2020

Abstract
The results of the enthalpy measurements of the Cs60Bi40 alloy in the range of 431–1127 K of the solid and liquid states are presented. The experiments were carried out by the mixing method on a massive isoperibolic calorimeter. The estimated errors for enthalpy and heat capacity of the melt were 0.4 and 1.4%, respectively. It was shown that the heat capacity of the melt decreases linearly with increasing temperature, and its absolute value in the studied temperature range is 1.25–1.45 times higher than the additive value. Table of recommended values of caloric properties over the range from 298.15 K to 1175 K was developed.
Heat transfer coefficients of gadolinium in the liquid state
Authors: Samoshkin D A , Agazhanov A Sh , Stankus S V 
Published: December 2020

Abstract
The thermal conductivity and the thermal diffusivity of gadolinium (Gd) have been measured by the laser flash method in the temperature range from 1610 to 1740 K of the liquid state. The measurement error of the heat transfer coefficients was 4–6%. The fitting equations for investigated properties have been received. It has been established, that temperature dependences of transport properties of liquid gadolinium have linear character. The table of reference data for thermal conductivity and thermal diffusivity of gadolinium have been developed for scientific and practical use.
The influence of crucible and crystal rotation on the hydrodynamics of a melt with a Prandtl number 16 and on heat transfer in the Czochralski method
Authors: Berdnikov V S , Vinokurov V V 
Published: December 2020

Abstract
The effect of crucible rotation on the evolution of the melt flow structure at a Prandtl number 16 on the temperature and velocity fields and on convective heat transfer in the Czochralski method is simulated numerically in the mixed convection regimes at a given crystal rotation rate. The ranges of similarity parameters corresponding to stationary and unsteady melt flows and heat transfer regimes, as well as regimes with the most uniform radial distributions of local heat fluxes are determined. In the initial regime Reynolds, Grashof and Marangoni numbers are set to ReK = 95, Gr = 4870 and Ma = 5835.
The study of thermostressed condition of the hydrogen quartz reactor during the methane pyrolysis
Authors: Kudinov I V , Pimenov A A , Mikheeva G V 
Published: December 2020

Abstract
Based on analytical and numerical methods, the detailed studies of the temperature and thermostressed condition of quartz reactor intended for production of hydrogen by pyrolysis of methane passed through the molten tin, are performed. Heating of tin contained in the reactor is realized by the application of electromagnetic field generated by the inductor. The analysis of the study results allows concluding that the values of radial, circular and axial stresses during a uniform movement of the reactor along its height even in the most unfavourable conditions when the temperature drop along the wall of the quartz reactor is maximum and is equal to the difference of temperatures between molten tin and environment (ΔT ≈ 1500 °C) are within the tensile strength limit for quartz σ
p
= 50Mpa (5 kg / mm
2). In case of non-uniform heating of the reactor along its height observed at its partial filling with molten tin, in the area of transfer from the filled part of the reactor to its non-filled part, there are high axial temperature gradients, which result in temperature stresses exceeding the tensile strength limit. By using the obtained results, the recommendations connected with the reactor heating rate and essential for ensuring its safe operation have been developed.
A Fantasy and Magical Adsorbent for Heavy Metal Ions Removal: Melamine
Authors: Guo Jing , Qiu Hongzhi , Wang Caiqiong , Hao Zhihui , Zhang Chenyu , Peng Hao 
Published: December 2020

Abstract
Many kinds of research had been done to treat the wastewater containing heavy metal ions in the world. Adsorption technology had attracted much more attention owing to ease of regeneration, simple operation and high-efficiency. Melamine possessed a great surface area especially modified with organic compounds. It showed efficient adsorption efficiency for various valent metal ions ranged from +1 to +6, which exhibited a bright application future for the treatment of wastewater.
Process simulation of nano-channel forming by thin film deposition
Authors: Jin Jian , Di Si , Hao Wang , Li Xiaojun , Wang Xudi , Sun Xuetong 
Published: December 2020

Abstract
In the traditional fabrication process of micro/nano-fluidic chips, thermal bonding is usually used for channel sealing, but it is easy to cause channel blockage, especially when the channel size is nanometer. The film deposition is a better way to seal the nano channel, and by controlling the deposition angle, the shape and size of the sealed channel can also be controlled. In order to understand the channel formation process of thin film deposition more intuitively, based on the COMSOL software, a free molecular flow module is used to simulate the film deposition process. The growth of the film is characterized by the post-processing of geometric deformation, so as to predict the channel shape. By comparing the simulation results with the experimental results, it can be seen that this simulation can explain the process of forming channels by angle-deposited films to a certain extent, and predict the channel size. In addition, the simulation results, in turn, can guide the film deposition process, so as to control the size of nano channel.
Optimal design of cylindrical sealed cabin based on simulation module
Authors: Zhi Wang , Junxian Yang , Bin Zhao , Xiangtao Ran , Jie Zhao , Wei Zheng 
Published: December 2020

Abstract
For the underwater sealed cabin with cylindrical structure, this paper proposes a theoretical design method based on the critical pressure algorithm of the external pressure cylinder combined with the simulation module embedded in Solidworks. Based on the results of FEA, the cabin structure is continuously optimized, and finally designed an economical and reliable cylindrical cabin structure, which can meet the requirements of LR rules. The design method has guiding significance.
Experimental Investigation of Microchannel Copper Plate Surfaces on Manufacturing and Wettability
Authors: Wu Nini , Zeng Liangcai , Fu Ting , Liu Zhengyang 
Published: December 2020

Abstract
In this study, static contact angle measurement experiments were conducted on smooth copper surface and microchannel structure surfaces under different droplet sizes. The results showed that shallow processing will more easily lead to the deformation of the processed interface. And the wettability of the microchannel surfaces with the same width and different depth were obviously different. Moreover, the contact angles on three microchannel surfaces were almost the same when the size of droplet was 12μl duo to action of gravity. The optimal droplet size is 9μl to measure contact angle in this study.
Finite element analysis of space truss sandwich structure
Authors: Cui Xu , Jin Shan , Zhao Changlin 
Published: December 2020

Abstract
In this paper, three kinds of carbon fiber reinforced epoxy resin (CF / EP) composites, including square, kagome and triangular grid sandwich structures, are analyzed by using ANSYS finite element analysis software. Through the comparison of the analysis results, the surface yield and core failure are the main failure mechanisms in three kinds of three-dimensional finite element models. The average bending loads of square, kagome and triangular grid sandwich structures are 18.0%, 19.7% and 24.6%, respectively. Therefore, the finite element analysis shows that more failures will occur due to the local collapse of the indenter.
Study on magnetic difference of artificial magnetite and natural magnetite
Authors: Wang Linjun , Chen Tiejun , Cui Jinbing , wei Liu 
Published: December 2020

Abstract
The magnetic differences of the artificial magnetite and the natural magnetite were studied to improve the magnetic parameters of artificial magnetite in the study. The effect of roasting conditions on the magnetism of artificial magnetite and the diffidence of magnetism and magnetic behavior of the artificial magnetite and natural magnetite was studied and compared. The results indicate that the magnetically strong artificial magnetite has been obtained under the optimized process parameters of the roasting temperature of 800°C, roasting time of 60min and the mass ratio of pulverized coal to ore (C/O ratio) of 2%. And the magnetic analysis shows that the magnetism of natural magnetite is stronger than that of artificial magnetite under the same conditions, but the remanence and coercivity of artificial magnetite is stronger than natural magnetite. With the decrease of particles, the magnetism of the artificial magnetite changes insignificantly, but the magnetization of natural magnetite decreases gradually; and the difference in the magnetism of two becomes smaller (from 1.53 × 10-4·m3·kg-1 to 0.14 × 10-4m·3·kg-1) with the decrease of particles. The gaps and impurities in the ore are the cause of the difference, which provides a theoretical basis for the further study the size-fractionated magnetic separation of artificial magnetite.
Crack resistance of reinforced-concrete sleepers with elastic rail fastening systems without base-plate
Authors: Plugin A A , Miroshnichenko S V , Lobiak O V , Kalinin OA , Plugin DA 
Published: December 2020

Abstract
The article presents the main results of complex experimental and theoretical research into the crack resistance and the limit state of reinforced-concrete sleepers with elastic rail fastening systems without base-plate. The objective of this study is to uncover reasons for the cracks and other breakages during operation, demonstrate their importance, and produce a set of recommendations for prevention of the most serious defects. The research also involved statistical analysis of the defect factor for sleepers, and determined the number of defects by type according to track layout, traffic density, tonnage transported, concrete grade and other characteristics based on the results of full-scale research of track sections and surveys from maintenance specialists. The full-scale research was made on rail sections under standard operational modes and on a test track section of straight and curved elements with sleepers of concrete grades C32/40, C35/45 and C40/50.The study was based on numerical methods, modelling of the stress-strain behaviour of the track, and estimation of the performance of sleepers with cracks.The method used incremental-iterative algorithms to consider the elastic plastic properties of materials, solve contact problems in operation of rail fastening systems, and also reveal the structural nonlinearity of joint action for track elements. The method was realized in LIRA-SAPR software on the basis of Building Information Modelling (BIM) and the Finite Element Method (FEM).The results were verifiedby experimental research into the sleepers under static and dynamic loads with estimation of crack development in terms of concrete grades, deformation modulus, rigidities of the ballast layer and the sub-grade, position of the reinforcement and other characteristics.
Comparative analysis of the acoustic efficiency of classical and sonic crystal noise barriers
Authors: Gieva Elitsa , Ruskova Ivelina , Nedelchev Krasimir , Kralov Ivan 
Published: December 2020

Abstract
This study presents a comparative analysis of the acoustic efficiency of classical and sonic crystal noise barriers conducted by means of numerical simulation. One of the most common solutions for transport noise reduction is the use of expensive combined noise barriers of high degree of reflection and absorption. Sonic Crystals are a relatively new type of noise barrier under development and investigation. In this study both types of barriers are compared on the basis of their area of application, noise level attenuation behind them, frequency response, technology of manufacturing, maintenance and price. Some of the characteristics are obtained through numerical simulations and experimental data, while others are available in published research studies. On the basis of the results conclusions about the application of sonic crystal noise barriers are made.
Electromagnetic analysis of a contactless charging station for electric vehicles
Authors: Hinov N L , Madzharov N D , Grozdanov D N 
Published: December 2020

Abstract
This report examines one of the many possible solutions of dynamic and static mode contactless power transfer, which determines the future of the automotive industry. Computer analysis of a contactless charging station for electric vehicles in certain frequency range and displacement between the transmitting and receiving coils are presented. Conceptual prototype design of 30 kW power transfer station is described in detail. Some optimization approach is also noted. The results are compared with the real experiments of prototype for a contactless charging station.
Determination the yaw moment of inertia of an SUV in laboratory conditions
Authors: Yashchenko Dmytro M , Timkov Oleksii M , Samburenko Ihor O , Hladchenko Volodymyr S 
Published: December 2020

Abstract
The vehicle oscillates in different planes relative to the three axes while driving. Especially important are the turns of the vehicle by dint of steered wheels. During such highspeed turns, the vehicle is subjected to additional charges of various systems, including the control system. Therefore, in the calculations of the control system of the vehicle, it is necessary to take into account the inertial mass of the vehicle. In general, the inertial characteristics of some solid body during its rotation are determined by the moments of inertia of this body. The moment of inertia of a solid body concerning the axis of rotation is simply the mass times the square of the perpendicular distance to the rotation axis. To test the results obtained by means of the analytical method, it is necessary to determine the moment of inertia of a vehicle in an experimental way. A convenient method of measuring the moment of inertia of a vehicle can be the method of torsional vibrations. The moment of inertia of a vehicle was determined using special equipment, which was constructed in the laboratory of the Department of Motor Vehicles of the National Transport University.
Service for optimization of charging stations selection for electric vehicles users during long distances drives: time-cost tradeoff
Authors: Hassler J , Dimitrova Z , Petit M , Dessante Ph 
Published: December 2020

Abstract
One of the weighty curb to electric vehicles (EV) acceptability is their constraints when performing long-distance trips. Even if improvements made on fast charging technology enable to recover up to 300 km range in 20 minutes, the low density of this kind of infrastructure and the variability in their availability can lead to significant waiting times for users. In this context, it is useful to provide users with information about the availability of charging stations to facilitate the use of EVs. In this article, we present a vehicle/infrastructure communication system. EVs ask charging stations for estimated waiting times at a specific time. Stations calculate these estimates based on notifications of intention to charge received from other vehicles. Thanks to this information, vehicles will be able to optimize their journey. This system has the advantages of being easily scalable because it is distributed, simple and only require the sharing of little personal information. However, the stations on the route may have different charging powers and prices. This raises the question of the criteria for optimizing these trips, depending on whether users favor the cost or the duration of the trip. In this article, we examine this tradeoff using multi-objective optimization and Pareto fronts, as well as the impact of such a communication system on recharge decisions.