bluuebunny/crossref_metadata_2025_split huggingface dataset:
The design and optimization of concentrating solar system in Wuhan based on clear sky model
Authors: Mao Qianjun , Yang Yizhi , Li Tao 
Published: March 2021

Abstract
To slow down fossil energy usage and protect the environment, concentrating solar power has experienced tremendous growth. This paper focused on the relationship between annual solar irradiation and tilt angle of the concentrating system to find the optimal tilt angle when annual solar irradiation is maximum. In the calculating process, the tilt angle between 0° and 90° is separated from several angles with a 5° interval and calculate the corresponding annual solar irradiation. A relationship line between solar irradiation and tilt angle is indicated, and the optimal tilt angle is discovered. The relationship between solar irradiation and tilt angle in different seasons is also investigated. The result of this paper would be a theoretical foundation to promote the application of concentrating solar systems in Wuhan.
Investigating Teachers’ Questioning in Second Language Acquisition Based on SETT Framework
Authors: Chen Zhixian 
Published: March 2021

Abstract
This paper focuses on teachers’ use of questioning with regard to the enhancement of students’ learning opportunities in Second Language Acquisition (SLA). The source of analysis comes from a classroom in China adopting curriculum of English as a Second Language (ESL), and the research is mainly based on the SETT (Self-Evaluation of Teacher Talk) framework. Through a case study on extracts taken from the classroom with different learning modes and contexts, understanding can be deepened about how varied questions are used to facilitate learning opportunities and improve learning outcomes by achieving certain pedagogical goals and activating different interactional features in the classroom, promoting second language acquisition more effectively. In short, this investigation aims at viewing questioning in an L2 (second-language) classroom with theoretical support in order to provide a reference for more studies on educational practice and second language learning.
Interpersonal Significance Analysis of Alberto Fernández’s Speech Against Epidemic Situation
Authors: Zhao Yuanyuan 
Published: March 2021

Abstract
Based on the interpersonal function of Systemic Functional Grammar (SFG), this paper builds Fernandez Speech Corpus for Anti-epidemic, and analyzes the interpersonal meaning of the speech delivered by the current Argentine President Alberto Fernández during the COVID-19 epidemic in two aspects-mood and modality. Therefore, the way of Alberto Fernández’s speech through interpersonal meaning during the anti-epidemic period was explored.
Study on Microstructure and Fatigue Properties of Q960 High Strength Steel
Authors: Zhu Pengxiao , Wen Jun , Li Yi , Zhang Dongya , Ma Xuejiao 
Published: March 2021

Abstract
The microstructure and fatigue properties of Q960 high strength steel were studied by optical microscope, conventional mechanical properties and fatigue tests. The results showed that the microstructure of Q960 high strength steel was tempered sorbite, the grain size grade 9, and the internal inclusions A1 and B1.5. The brinell hardness of Q960 high strength steel was 326.5HBW10/3000, the tensile strength more than 1000MPa, the impact energy 86.5J, which indicated good strength and toughness. In the case of high fatigue strength, the dispersion of fatigue life was low. The dispersion of fatigue life increased with the decrease of fatigue strength.
Prediction of the Optimal Umbrella Shape of Insulators Based on Data Mining Technology
Authors: Xing Xiangrong 
Published: March 2021

Abstract
The insulator flashover process is affected by many factors. In order to better study the factors that affect the insulator flashover voltage, and then accurately predict the insulator flashover voltage. In this paper, 11 different types of composite insulators are studied through artificial pollution tests. Data mining technology has been widely used now. In order to better apply data mining in the prediction of insulation flashover voltage, this paper adopts the BP neural network in data mining technology to predict the flashover voltage of different umbrella-shaped insulators. In addition, in order to further improve the prediction accuracy of the model, this paper uses the global search capability of genetic algorithm to optimize the initial weights and thresholds of the BP neural network, and optimizes the BP neural network prediction model, and established an optimization model based on genetic algorithm to optimize BP neural network. Through this method, the flashover voltage of the insulator can be predicted in time, which is of great significance for maintaining the safe and stable operation of the power system.
Determination of Interfacial Heat Transfer Coefficient of 22mnb5 Boron Steel in Hot Forming Based on Inverse Heat Transfer Method
Authors: Xiao Gang , Zan Zhiwei 
Published: March 2021

Abstract
The heat transfer coefficient at the blank-die interface is difficult to determine the values from experiments due to the influence of various factors, such as forming load, coating material, coating thickness, roughness of surfaces and gap formation caused by the deformation of blank and die, etc. In the present paper, the interfacial heat transfer coefficient (IHTC) between the blank and die is identified by using the method of inverse analysis based on measured temperatures. The results show that the method of inverse analysis is a feasible and effective tool for determination of the blank-die IHTC. In addition, it is found that the identified IHTC varies with temperature and load during hot stamping. The characteristics of the IHTC variation have also been discussed.
F-POWER Prosthetic Research on Flexible Receptacle
Authors: Lv Shaowei , Zhang Zhiyong , Xu Yanhua 
Published: March 2021

Abstract
In recent years, with the development of robot technology, the application of robot structure with high speed, high precision and high load-to-weight ratio has attracted the attention of industry and aerospace. Due to the increase of the flexibility effect of joints and connecting rods during the movement, the structure is deformed, which reduces the accuracy of task execution. Compared with rigid mechanical arm, flexible mechanical arm has the characteristics of light structure, high ratio of load to dead weight, so it has lower energy consumption, larger operating space and high efficiency, and its response is fast and accurate, and it has many potential advantages, so it occupies a very important position in various application fields. F-POWER flexible prosthesis is a man-machine integrated mechanical device that can be worn by people. It can complete the combination of man and machine, control the mechanical arm by human behavior, and help the disabled to complete daily grasping tasks. It can combine the high load and high precision of the machine with the flexibility and intelligence of the human body. At the same time, using adaptive flexible materials can improve the comfort and stability of the prosthesis. The combination of flexible gripper and mechanical gripper can effectively meet the needs of people with disabilities and reduce the difficulty of operation.
Solar panel cleaning vehicle based on Konda effect
Authors: Zhang Wenbo , Wang Zehao , Zhu Lingfeng 
Published: March 2021

Abstract
In order to solve the problem of parking difficulties in urban residential areas, a small auxiliary parking device is proposed. Starting from solving the social pain points such as unreasonable parking space planning, residents’ random parking, and reducing parking difficulty, it achieves the effect of assisting parking space planning and reducing parking difficulty. The device mainly provides power through the motor, and drives the drum to realize binary control by controlling the steering wheel of the vehicle owner, that is, controlling the switching of the whole movement, and the switching of the front back and left right of the control device. By pressing the spring switch on the wheel, the front control motor drives the gear clutch device to complete the bidirectional switching from left and right movement to back and forth movement. Through the shear fork supporting mechanism and separate self-locking slide rail, the car is lifted and the parking device is driven away.
Research on Automatic Temperature Monitoring System of Belt Roller in Western Suburb
Authors: Qing Chen 
Published: March 2021

Abstract
Most coal mine conveying systems in China are transported by belts. Belt conveying system is very important for coal mine production. Bearing is one of the important components of belt conveyor. During the running of bearings, if the temperature rises, it will affect the normal transmission of belt conveyor. In this paper, the continuous on-line temperature monitoring and temperature display of roller bearings of belt conveyor in the western suburbs of Zhaozhuang Coal Industry are realized based on the existing headquarter system of the western rubber belt and the underground industrial ring network. When the monitoring data exceeds the limit or is abnormal, sound and light alarm will be sent out in time.
Experimental Study on Presplitting Blasting of Roof Cutting Along Goaf with Thick and Hard Roof Plate
Authors: Tang Jianquan , Liu Hongliang , Chen Anfa 
Published: March 2021

Abstract
In order to explore the reasonable blasting parameters of the gob-side entry retaining technology under the specific conditions of thick and hard roof, and realize successful roof cutting and safe roadway retaining, the thick and hard roof of the XV1306 working face in the first panel of Yixin Coal Mine is used as the research background. The drilling parameters of blasting are analyzed, which contains the depth of slitting, angle of slitting and spacing of blasting holes. And the influence of charge structure and charge amount on the effect of presplitting blasting was studied through underground blasting tests. The results show that when the blast hole depth is 10m, the drilling angle is 15°, and the blast hole spacing is 500 mm, with adopting the “2+3+4+4+3+2” method to the deep-hole charge structure, the top-cut crack rate is more than 90%. the penetration effect of top-cut crack is good, which can meet the needs of roof cutting for pressure relief and control of surrounding rock in roadway retaining.
Application of Key Technologies for Multi-Terminal Change of Frame-Double Core Tube Super High-Rise Building
Authors: Chen Xu , Li Shimin , Yu Ziqiang , Xu Jialin , Wang Lijian , Pei Yusheng , Zhang Wei , Jing Zhanxu , Min Liuliang , Wang Yaru , Zheng Hui 
Published: March 2021

Abstract
Frame-double-core tube structure is a structural form suitable for super high-rise buildings with long or irregular standard floor plan. In this paper, the structural arrangement and structural member size of the double core tube are determined through the analysis of structural indexes such as stiffness calculation and torsion effect under rare earthquake. At the same time, through the research of all-steel climbing frame and aluminum formwork under the condition of super high-rise height and structural change, the application of all-steel climbing frame and multi-end aluminum formwork with super high-rise height change are solved, which speeds up the construction progress, greatly reduces the safety and quality risks in the construction process of super high-rise buildings, and at the same time, reduces the material and labor costs to meet the development requirements of green construction.
Research on Evaluation Index System of Autonomous and Controllable Capability of Aerospace Test and Launch System
Authors: Hu Yunlong , Xie Weiqi , An Jingwei , Yao Jingbo , Ma Wei 
Published: March 2021

Abstract
In order to solve the potential risks of code opening, backdoors, logic bombs, etc. in the key components, operating systems, and software of various hardware and software equipment in the aerospace test and launch system, an evaluation and research on its autonomous controllability is conducted. This paper analyzes the current status of the evaluation of the autonomous controllability of the space test launch system, put forwards the construction method of the evaluation index system of autonomous and controllable capability and the principle of index extraction, and constructs the evaluation index system. Finally, a case study is carried out based on the improved AHP method. The analysis results show that the research is of great significance to the development of autonomous controllability of aerospace launches and enhancement of the autonomy and advancement of aerospace test launch technology.
Research on the Integration of Launch Vehicle Test and Fault Diagnosis
Authors: An Jingwei , Cheng Long , Xie Weiqi , Hu Yunlong 
Published: March 2021

Abstract
According to the current situation of launch vehicle testing and fault diagnosis being carried out independently and with a high degree of manual participation, a plan of organically combining rocket testing and fault diagnosis for an integrated overall design is proposed, which is conducive to improving system integration and shortening the test cycle. Based on the analysis of the existing technology, the author respectively proposed a process-driven automatic test technology and a fault diagnosis method with an extended expert system as the core and a combination of multiple fault diagnosis technologies, aiming at the two core technologies in the integrated solution –automatic testing and fault diagnosis.
Research on the contribution rate of vocational education to social and economic development
Authors: Song Mengjun , Zhang Liping , Feng Yongxin 
Published: March 2021

Abstract
This paper makes a quantitative research on the promotion of vocational education to social and economic development. Taking the population of a village in Tianjin as the research sample. This paper makes a quantitative design on the role of education in the social and economic development for the village in the next 10 years, and obtains that vocational education has a relatively obvious role in promoting the economic development of the village, which provides scientific data support for the future education mode of the village population. So as to provide effective theoretical suggestions for the economic development for the village, the whole Tianjin, even the whole nation.
Research on Multi-objective Optimization of Capacity Allocation for Marine Hybrid Energy Storage System
Authors: Wang Zecheng , Li Xin 
Published: March 2021

Abstract
The hybrid energy storage system’s allocation problem is a multi-target and multi-direction optimization problem. Single-objective allocation for the Marine Hybrid Energy Storage System (MHESS) cannot help the hybrid energy storage system unit give play to its optimal effect. A diesel-electric hybrid ship is used as the object. In this paper, a mathematical model of a hybrid energy storage device is established, and multi-objective optimization allocation is performed on the model based on the NSGA-II. Finally, the optimized model is applied to a ship, and eleven kinds of batteries and six supercapacitors are selected for simulation. The simulation results show the relationship between the objective functions.
A compound control strategy for LCL-based three phase four leg shunt active power filter
Authors: Tao Mao 
Published: March 2021

Abstract
Conventional single inductor filter which is applied to three-phase four-leg shunt active power filter hardly meet the requirements for high frequency harmonic suppression. LCL filter has advantage both in high dynamic response and high frequency harmonic suppression. Repetitive control can realize accurate tracking of multi-harmonics signal. However, the design of corrector for repetitive control is mostly complicated. This paper proposes a topology of three-phase four-leg shunt active power filter based on LCL filter and improve its stability through capacitive current feedback. Compound control strategy which includes PI control and repetitive control is adopted to improve the compensation effect of harmonic current. Corrector for repetitive control has simple structure and is easy to design. The conventional PI control and compound control are compared and analyzed in detail. Moreover, the difference of property between LCL filter and single inductor filter is compared and analyzed. Simulation results show the correctness and effectiveness of the designed LCL filter and the proposed compound control strategy. The proposed method provides a reference for making three-phase four-leg shunt active power filter more practical.
Analysis and Modification of Vibration Issue of Condensate Regulating Valve in a Nuclear Power Plant
Authors: Zhang Yutao , Yan Dong , Dong Wenhui 
Published: March 2021

Abstract
Regulating valves are widely used in nuclear power plants. The critical application of regulating valves determines whether the unit and system can operate safely, stably and economically. Taking the analysis and modification of the vibration issue of the conventional island condensate regulating valve in a pressurized water nuclear power plant as an example, this paper expounds the essence of the vibration issue of the regulating valve and provides reference for other power plants to deal with the same issue..
Evaluation, Risk and Prospect for Electricity Investment in Five South American Countries
Authors: Liu Yuxi , Feng Yiming , Jiang Hongli , Li Yuxi , Zhou Baozhong 
Published: March 2021

Abstract
South America is the natural extension of the “One Belt, One Road” initiative and has now become one of the important destinations for Chinese companies’ overseas investment. South America is rich in renewable energy resources, but has a large power gap and has good investment potential. This paper selects 20 factors of five major factors: politics, economy, law, society, and resources, and uses the entropy method to evaluate and compare the electricity investment environment of the five countries in South America. Combined with the regional power development and planning, the priority investment countries and industries are obtained. In addition, we put forward investment suggestions such as seizing opportunities, building brands, strengthening cooperation, and initiating change.
The non-excavation corrosion prediction model of grounding grid based on particle swarm optimization extreme learning machine
Authors: Li Wenbin , Wang Yong , Feng Yanting , Wang Qing , Xu Xuexia , Li Guowei , Dong Guozhen , Jing Shangqian , Chen Ersong , Fan Xiaoliang , Liu Jianmin 
Published: March 2021

Abstract
The grounding grid is an indispensible part in the eletrical system. Nevertheless, the grounding grid materials are susceptible. Considering the small sample size and strong nonlinear feature of the grounding grid corrosion, we introduced a non-excavation corrosion prediction model based on particle swarm optimization extreme learning machine. This model utilized the extreme learning machine to fast deal with the nonlinear relationship, and utilized the particle swarm optimization to search global optimal solution. Compared with generalized regression neural network and BP neural network, the prediction results of this model are more accurate. Thus, this model might have bright future in improving the accuracy of corrosion prediction of grounding grids.
Research of Available Transfer Capacity of Power Grid Considering Optimal Location-allocation of STATCOM
Authors: Zhang Bin , Wu Hanbin 
Published: March 2021

Abstract
The rational planning of STATCOM can effectively improve the power transmission capacity of the system. In the research of grid transmission capacity considering N-1 safety check, the nonlinear problem is difficult to solve. This paper proposes a calculation method of transmission capacity based on Benders decomposition method. Firstly, the sub-question is added to the core accident screening process to fit the actual grid operation scenario. Secondly, the parallel problem calculation method is used in the sub-problem solving to improve the calculation efficiency. The example shows that the proposed method solves the transmission capacity of the asynchronous grid, and the convergence speed is faster, which verifies the improvement effect of STATCOM on the transmission capacity of the asynchronous grid. The method in this paper can provide calculation aids for grid optimization planning and operation.
Power load forecasting research based on neural network and Holt-winters method
Authors: Fan Jianjun , Liu Xinzhong , Li Zhimin , Wang Xinku , Cao Shengnan , Lei Jiakun 
Published: March 2021

AbstractSince the electric load shows a very obvious periodicity in time series, increasing the periodic factor in the power load forecasting is a research direction of power load forecasting. It is by adding trend and seasonality (that is, periodicity) to smoothing values that the Holt-winters algorithm improves the accuracy of predictions. In this paper, Holt-winters algorithm and neural network algorithm are used to build power load prediction models respectively, and data of city A in Shandong province is used for testing. Experimental results show that the prediction results of the two algorithms are similar, but the Holt-winters algorithm is slightly more accurate.
Zero Energy Consumption Motor Cooling Device Based on Vortex Tube Effect
Authors: Qi Lei , Yang Yuanhang , Wu Honglin 
Published: March 2021

Abstract
In the daily operation of the industry, due to the long-term operation of machinery, the motor load is too large, resulting in motor overheating. In this paper, a kind of large-scale machine tool is designed, which uses the energy wasted in the non-working state of the large-scale machine tool to convert kinetic energy into air energy to produce compressed air with larger compressibility. Then, the compressed gas is sent to the special vortex tube. By using the structural characteristics of the vortex tube device, the cooling gas with lower temperature can be generated, which can rapidly cool the motor and improve the motor operation. The efficiency and the service life of the motor reduce the probability of motor failure in the actual production process.
Physical properties and basic theory of dielectric
Authors: Fan Shengting 
Published: March 2021

Abstract
At the beginning of human understanding and application of electricity, dielectric materials have been in the world. At that time, however, the dielectric was used only as an insulating material to separate the current. Until the 1930s, the main object of research was insulating materials, mainly focusing on the dielectric constant, loss, conductance and breakdown of insulating materials. After the 1930s, with the emergence and development of new technology, dielectric has been far from being only used as insulation materials to the application, especially the appearance of polar dielectric and widely used, making people’s understanding of dielectric and its category and the past is very different. The research capacity has gradually evolved from the four main parameters of insulators to the study of the internal polarization process. This article from the dielectric polarization, dielectric loss, dielectric conductance and breakdown, dielectric thermal side note relaxation theory and its application of four chapters of the system to learn related content. The properties of dielectric are analyzed from the microscopic point of view, and the related theoretical hypotheses are established to reveal the corresponding macroscopic phenomena. The polarization, loss, conductance and breakdown properties of dielectric are analyzed. The dielectric constant ε, loss Angle tangent tanδ, conductivity γ and breakdown field intensity E are used to describe the properties of dielectric quantitatively.