bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Improved Particle Swarm Optimization algorithm for Optimal Control of ASP Flooding
Authors: Lang Meiling , Ge Liang 
Published: November 2021

Abstract
An optimization for injection of alkali/surfactant/polymer (ASP) flooding in oil recovery is considered in this paper. This optimal control problem (OCP) is formulated as a parameter identification system, where the objective function is revenue maximization and the governing equation is multiphase flow in porous media. We use the ASP concentrations and slug size as the control and give the pointwise constraint for the control. An improved particle swarm optimization (IPSO) which is a particle swarm optimization (PSO) with second-order oscillatory in velocity, is applied to solve the OCP. Finally, an example of the OCP for ASP flooding is exposed and the results show that the IPSO method is effective and feasible.
Photovoltaic Direct Drive Water-saving irrigation System and Its Optimization Design Method
Authors: Zhu Junfeng , Wang Xingtian , Liu Wenbing , Wang Shifeng , Wang Qiujun 
Published: November 2021

Abstract
Photovoltaic irrigation has been widely used in many areas without conventional energy sources. In order to solve the problem of unstable operation and poor irrigation uniformity caused by the diurnal variation of solar radiation, a photovoltaic direct-drive water-saving irrigation system with automatic regulation was proposed. By using automatic control technology and the method of zonal rotation irrigation, all the electric energy generated by solar panels can be converted into irrigation energy under different light intensities, so that the water-saving irrigation equipment can work stably in different regions and the irrigation uniformity is ensured in different regions. According to the characteristics of solar energy resources and photovoltaic water-pumping units, the optimum design method of photovoltaic water-saving irrigation system is put forward. The minimum capacity of solar panels can meet the irrigation demand of a certain area, which can guide the engineering design of solar water-saving irrigation, greatly improve the engineering quality and energy utilization rate. It has the advantages of simple design, low cost, stable operation and energy-saving ring.
Optimal dispatching of integrated energy system considering flexible load
Authors: Guo Jinrui , Zhang Zhijun , Xu Lei , Wang Hao , Wang Hui , Niu Yifan 
Published: November 2021

Abstract
Demand response, as an effective dispatching method, has been widely used in the optimization research of integrated energy system (IES). In this article, first, the mathematical model of flexible loads including shiftable electric, heat, and cooling load are established in line with their characteristics. Second, an optimal scheduling model of the IES is built, where the minimum sum of system operation and maintenance and the environmental protection costs comprise the objective function. Furthermore, the alternating direction multiplier method is used to solve the optimal scheduling model in a fully distributed manner. Finally, simulation results show that the proposed model and algorithm can efficiently solve the IES optimal dispatching problem, reduce the peak-valley difference, and improve the stability of the system.
Study on Oil-water Two-phase Migration Mechanism of Low Permeability Fractured Core based on the Online NMR Testing
Authors: Zheng Xiaomin , Li Ning , Li Dong , Li Nan 
Published: November 2021

Abstract
Understanding the dynamic migration mechanism of oil-water two-phase is the key to improve the effect of water injection development in low permeability fractured reservoir. Based on artificial fracturing of core and basic physical parameter testing, the online NMR displacement experiments of cores with different fracture widths are conducted to analyze the oil-water dynamic distribution characteristics and migration mechanisms. The experimental results show that when water breaks through at the outlet, oil volume in the small pores is basically unchanged. In the large pores it decreases to a certain extent, while in the fracture it decreases greatly. When the displacement is over, oil volume in the small pores still changes little, while it decreases greatly in the large pores, and it is almost zero in the fracture. With the decrease of fracture width, the recovery ratio when waterflooding front breaks through and the final recovery ratio after displacement increase gradually. The contribution proportion of recovery ratio in the fracture decreases as a whole, while in the large pores it increases gradually, and in the small pores it decreases slightly. The research results lay a foundation for the optimal design of fracture parameters and the adjustment of water injection development technology policy in low permeability fractured reservoir.
A Study on the Characteristics of the Concentrated Solar Photovoltaic/thermal Integrated System
Authors: Ai Dengxin , Wang Guilin , Li Ye , Gan Zhiyong 
Published: November 2021

Abstract
This paper mainly introduces a comprehensive solar energy utilization system with low-CPC and polycrystalline silicon solar photovoltaic components. Outdoor experiments have been made to test the electrical efficiency, heat efficiency and their changes of the system with fixed temperature of outlet water and different sunshine conditions. Besides, this paper also compares the effects of outlet water at various temperatures on the efficiency of the whole system as well as the temperatures and flow rate responses with different PID parameters. Through analysis of these experimental data, the most desirable temperature of outlet water and PID parameters have been obtained in CPC-PV/T Hybrid Thermal-electric System, thus providing references for relevant experimental research.
Preparation and absorption performance of CNTs/PUR honeycomb composite absorbing material
Authors: Zhao Yankai , Bi Song , Hou Genliang , Liu Zhaohui , Li Hao , Song Yongzhi , Hou Zhiling 
Published: November 2021

Abstract
In this paper, a carbon nanotubes/polyurethane resin (CNTs/PUR) honeycomb composite absorbing material was prepared, and the influence of the content of carbon nanotubes on the absorbing performance of single-layer and double-layer honeycomb composite absorbing materials was investigated. The mechanical properties of single-layer and double-layer materials are discussed. The honeycomb core and carbon nanotubes are compounded together by the impregnation method to form a CNTs/PUR honeycomb composite absorbing material. The microstructure shows that the carbon nanotubes are uniformly dispersed in the water-based polyurethane resin, and the impregnated layer and the honeycomb wall are well combined. The reflectivity of the material shows that as the content of carbon nanotubes increases, the absorption performance of the material first increases and then decreases; when the content of carbon nanotubes is 5.6%, the single-layer honeycomb composite absorbing material has the best absorption performance. The effective absorption bandwidth is 10.6 GHz (2~18GHz), and the maximum absorption strength is -24.5 dB; when the combination mode is 2-4, the double-layer honeycomb composite absorbing material has good absorption performance, and the maximum absorbing strength is -32.2dB, the bandwidth is 13.7GHz (2~18GHz).
Simple and accurate calculation model of viscosity for supercritical CO2
Authors: Deng Jia , Zhao Guangjie , Zhang Lan , Ma Huizhong , Song Fuquan , Cao Qing , Zhang Xueling 
Published: November 2021

Abstract
The high-precision calculation method suitable for the viscosity of supercritical CO2 is reported. The modified LBC model, modified DS model and Ehsan empirical formula are selected to calculate viscosity. The error analysis result shows that the average absolute error of the modified DS model is the lowest, which can be applied to the engineering calculation. The LBC model is suitable at 7.5–25MPa and the Ehsan empirical formula has high accuracy at 25–60MPa. Then the viscosity plate is drawn at temperature range of 310–800K and pressure range of 7.5–60MPa, which can be applied in carbon dioxide resources recovery and utilization of technology.
Investigation of the phase transformation characteristics of Fe-Co elastrocalaric refrigeration alloy
Authors: Li Xianfa , Shi Yongjun , Wang Shuyao 
Published: November 2021

AbstractMechanical alloying (AM) and powder metallurgy(PM) have been widely used in many fields especially in the development of new alloy materials due to the advantages of simple process, high material utilization rate and accurate material ratio. In this investigation, experimental procedures were proposed to explore the phase transformation characteristics, elastrocalaric refrigeration effect of Fe-Co alloys synthesized by AM and PM. The samples of Fe-Co elastrocalaric refrigeration alloy with different phase transformation temperatures and different enthalpy changes have been successfully prepared by changing the initial ratio of Co element. The results show that the phase transformation characteristics have changed with the increase of Co content and showed different changing trends.
Study of the corrosion of stainless steel with fatty acid/paraffin/graphite composite phase change materials
Authors: Yan Quanying , Ma Guangyuan , Wang Wei 
Published: November 2021

Abstract
The corrosion performance of phase change materials on stainless steel was studied using single fatty acid, fatty acid/paraffin mixed phase change materials and fatty acid/paraffin/graphite composite phase change materials as corrosion media. The results show that the corrosion of fatty acid, paraffin and graphite composite phase change materials to stainless steel is very small; among them, stearic acid series of phase change materials are the least corrosive and can be used as the ideal energy storage medium for stainless steel phase change heat storage and heat exchange devices.
The Mass and Heat Transfer Characteristics Study of the Natural Convection Evaporation of an LNG Droplet in BOG
Authors: Fei Zhengyang , Deng Jiajia , Lu Jinshu , Wang Bin , Xue Dawen 
Published: November 2021

Abstract
The evaporation process of LNG droplets in BOG is closely related to the cooling down process of the LNG tank, but there isn’t an available droplet evaporation model at present. Been prepared based on the conservation of mass, momentum, and energy, a CFD model of natural convection evaporation of a single LNG saturated droplet in the BOG was developed and applied. The results show that:①There are two distinguished zones around the droplet surface, where the local temperature boundary layer of the droplet gradually thickens and rapidly thickens with the increase of the angle of inflow from 0 ° to 90 ° and from 90 ° to 180 °, respectively; ② With the increase of droplet size, the average thickness of temperature boundary layer increases gradually, which leads to the decrease of relative evaporation rate;③“blowing effect” remains almost unchanged with the increase of droplet size.
On the tensile fracture behavior of Cr coating for ATF cladding considering the effect of pre-oxidation
Authors: Pan Ziyan , Yuan Mingduo , Zou Zhenyu , Zhang Weijian , Du Mingyue , Jiang Jishen , Ma Xianfeng 
Published: November 2021

AbstractIn this study, the fracture mechanisms of Cr-coated Zr4 alloy samples were studied by in-situ tensile testing with high-resolution observations. Both original sample and pre-oxidized sample were studied to study the effects of pre-oxidation on the cracking and failure behavior. For the Cr-coated Zr4 sample, with the increase of tensile strain, multiple surface cracks were dominant and less interfacial cracks were formed, indicating good interfacial strength of Cr coating. For the pre-oxidized samples, there was a thin oxide layer formed on the Cr coating surface, revealing improved oxidation resistance and protection effects. However, a brittle ZrCr2diffusion layer was formed in the same while at the Cr/Zr4 interface underneath the Cr coating, which would lead to earlier micro-cracks formed under tensile stress and evidently degrade the interfacial strength. The findings in the study indicated the importance of optimizing coating microstructure in future study to avoid forming the above-mentioned brittle diffusion interlayer and the associated premature failure.
Study on anode material of CoδFe1-δOx-Sm0.2Ce0.8O1.9 for solid oxide fuel cell
Authors: Dong Runze , Yang Pu , Shao Tianqi , Wang Ruochen , Li Ping , Fu Dong 
Published: November 2021

Abstract
This paper mainly explores the anode properties of CoδFe1-δOx-Sm0.2Ce0.8O1.9 (SDC) (δ=0, 0.2, 0.5, 0.8, and 1) for solid oxide fuel cell (SOFC). The composite anode materials were synthesized by sol-gel method, and the XRD technique was used to characterize structural properties. After H2 reduction at 700 oC, the CoδFe1-δOx oxides were reduced to Co, Fe metal or Co-Fe alloy. The symmetric cells were fabricated with CoδFe1-δOx-SDC as the electrodes and SDC-carbonate as the electrolyte. At 700 oC, the symmetric cell with Co0.5Fe0.5Ox-SDC electrodes showed the lowest polarization resistance and the symmetric cell with Co0.2Fe0.8Ox-SDC showed the largest polarization resistance.
Preparation of Binary Mixed Inorganic Hydrate
Authors: Yan Quanying , Lv Yifan , Wang Chenyu 
Published: November 2021

Abstract
In this paper, 54 binary mixed inorganic hydrates composed of Na2SO4·10H2O, Na2CO3·10H2O, CH3COONa·3H2O and MgSO4·7H2O were prepared, and try to research their reasonable and feasible preparation methods. The results show that the thermogravimetric ratio of binary mixtures varies with the composition and proportion of binary mixtures. There is evaporation of water in the mixtures preparation process, so appropriate deionized water should be added to supplement the evaporated water in the mixtures preparation of phase change materials.
Research on Control Method of Wet Desulfurization System for Coal-fired Boiler
Authors: Zhang Xingchao , Liu Jianhong , Hu Peng 
Published: November 2021

Abstract
In wet flue gas desulfurization technology, the key factor affecting flue gas SO2 absorption is the control of slurry pH value in the absorption tower. However, most of the commonly used pH value control methods have some defects and cannot fully meet the system control requirements. On the basis of the analysis for the problems in the control process, this paper discussed a control strategy based on internal model control algorithm. The system simulation test showed that this control method had good dynamic performance, robustness and anti-interference, which could realize the relatively accurate control of pH value for wet flue gas desulfurization system, and achieve the control goal.
Influence of friction coefficient on mechanical properties of braided wire rope in winding traction state
Authors: Cui Weihua , Gu Weilin , Li Xiaoyang , Wang Hui 
Published: November 2021

Abstract
In the construction of cable erections, when passing through the reel of the tractor, the braided wire rope used for traction in the state of winding traction is subjected to the composite action of tensile, bending, extrusion, friction and other forces, of which the stress condition is the most complicated, and the wear is the most likely to occur. The Friction coefficient is an important factor which directly affects the mechanical and wear properties of wire ropes. Therefore, according to the cable traction condition, the influence of friction coefficient on the rope tension attenuation during the winding traction process is analyzed. Because the wear of wires between braided wire rope strands is the most serious, this paper focuses on the influence of the friction coefficient between the rope strands on the mechanical properties of wire ropes. Regarding YS9-8×19 braided wire rope as the research object, a solid model of “rope-wheel” winding traction system is established. Based on the actual conditions, the finite element simulation model of winding traction system is established by setting load and constraint conditions. The influence of friction coefficients on the stress and deformation of braided wire rope strands is researched, by setting different friction coefficients between rope strands and analyzing the simulation results, in order to provide theoretical instructions of braided wire ropes used for traction.
Research on edge controller based on industrial furnace
Authors: Deng Yi , Gao Jiapeng , Zhang Xuewen 
Published: November 2021

Abstract
Traditional control instruments and DCS control systems are limited by shortcomings such as single control function, independent controlled elements, inability to close-loop control on site, and ineffective communication. Aiming at these problems, this paper proposes a kind of industrial furnace edge controller which has the functions of acquisition, calculation, control, storage, output and communication in one. The edge controller structure, edge computing and the control method applied to edge computing are designed. The fuzzy PID control method is compared with the conventional PID control method by taking the temperature control of resistance furnace as an example. The simulation shows that the control effect of fuzzy PID on resistance furnace temperature is obviously better than that of conventional PID. The test results also show that the performance indices for the fuzzy PID control are better, which again proves that the fuzzy PID control outperforms. The research results of this paper are of reference value for engineering applications.
Effects of Pitching Motion Elements on Aerodynamic Characteristics of Airfoil
Authors: Yin Rui , Huang Jing , He Zhi-Yuan 
Published: November 2021

Abstract
The aerodynamic characteristics of NACA4412 airfoil with different pitching motion elements were compared and analyzed based on CFD in this research. The results are acquired as follows: the difference between the lift and drag coefficients of the airfoil during pitch up and pitch down motions becomes larger with the increase of the pitching amplitude or initial angle of attack; as the pitching amplitude increases, the lift coefficient grows slightly greater and the drag coefficient grows much greater; as the initial angle of attack increases, the lift coefficient grows much greater and the drag coefficient grows slightly; the smaller the attenuation frequency is, the larger the lift-to-drag ratio of the airfoil will be.
Effect of Solution Temperature on the Microstructure and Properties of TB10 Titanium Alloy Bars
Authors: Luo Zheng , Tan Zhouming , Wei Yanguang , Cui Xuefei , Tao Haiming 
Published: November 2021

Abstract
This paper studies the effect of solution temperature on the microstructure and mechanical properties of TB10 titanium alloy bars. The results show that the microstructure is composed of β phase and primary α phase (αp) when solution treatment is below the phase transition temperature. With the increase of the solution temperature, the β phase grain size in the microstructure increases, the thickness of the grain boundary decreases, and the number and size of the αp phase decrease, so that the strength of the alloy decreases and the plasticity increases. When the solution treatment temperature is 800°C, the reticulated grain boundary αp phase causes the plasticity to drop rapidly. When the solution treatment temperature is above the phase transition point, as the solution temperature rises, the β phase re-nucleates and grows, the grain size increases, the number of αp phase decreases. The super-cooled β phase grains induce martensite phenomenon due to stress, which eventually causes the strength and plasticity to decrease.
Coupling mechanism of materials and screen surface motion in multi-stage variable inclination equal thickness screening process
Authors: Huang Long , Zhao Yuemin , Zhang Yadong , Pan Miao , Jiang Haishen , Dong Liang 
Published: November 2021

Abstract
Multi-stage variable inclination equal-thickness screen (MSVIETS) is widely used in separating coal and mineral particles because of its large production capacity and good screening performance. In this study, the kinematic characteristics of infeed and outfeed ends surface under the conditions of load and no load was investigated by using a high-speed camera analysis system. The motion speed of the screen surface at the infeed end was approximately 5 times higher under load than under no-load conditions, and motion speed of the screen surface at the outfeed end was approximately 4 times higher than under no-load conditions. The mechanism of coupled motion of material and screen surface in the process of multi-stage variable inclination equal thickness screening was elucidated, and the energy coupling transfer law was “strong in and weak out”.
An improved new transformer type arc suppression reactor
Authors: Liu Meijie , Ji Degui , Meng Zhen 
Published: November 2021

Abstract
In this paper, to accurately compensate the arc suppression coil, the structure of the transformer is improved. Here, a fixed inductive element is connected in series with the short-circuit winding, which combines with the leakage inductance of the original transformer to form a new short circuit impedance. The improved transformer reduces the manufacturing cost and difficulty of the controllable inductor, reduces the requirements for the winding of the reactor, and makes the manufacturing easier.
Performance analysis and material selection of stainless steel expansion joints for power grid equipment
Authors: Zeng Yanggen , Hu Yujing , Wang Zhensheng , Xie Yi , Liu Weike 
Published: November 2021

Abstract
Stainless steel expansion joint, as the connecting part of GIS equipment, has the function of compensating the deformation of GIS caused by cold and hot stress. And it should at least meet the requirements of anti-corrosion and non-magnetic according to the working environment. This work investigate the performance of 304, 316L and 825 austenitic stainless steel expansion joints by metallographic analysis, hardness test, XRD analysis and magnetic analysis, and suggestions on material selection of expansion joint for power grid equipment are put forward.
Research on calibration method of uniformity of radiation interference field of intense electromagnetic pulse
Authors: Fu Chunliang , Gong Linhua , Lin Jiangjing , Zhou Jun 
Published: November 2021

Abstract
With the rapid development of electronic and electrical products, the working frequency of ite products is higher and higher, the influence frequency range of interference between electronic products is also expanding, the test frequency range of radiation anti-interference is improving, at the same time, more and more attention is paid to the requirements of radiation anti-interference test site. At present, the uniformity of radiation field is mainly realized by single point multiple test, which will inevitably lead to the measurement error due to the time-varying characteristics of the radiation signal itself; In addition, the test time is greatly increased and the test efficiency is low. In order to solve these problems, this paper designs a device which can realize multi-point test at one time and can automatically adjust the test area. The simulation shows that the device can meet the requirement of 9point uniformity test of radiation field in 500mm × 500mm ~ 1500mm × 1500mm area. On this basis, experiments are carried out in 1000mm × 1000mm test area for 1.35GHz and 2.88GHz. The experiments show that the test device can meet the requirement of 9point uniformity test and greatly improve the test efficiency and automation.