bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinematics modeling and workspace analysis of large offshore trestle based on wave compensation
Authors: Wang Xingyao , Xue Yifan , Liu Yanjun 
Published: May 2021

Abstract
Referring to the modeling method of the series manipulator, the D-H parameter method is used to model the kinematics of the large-scale offshore trestle, and the forward kinematics equation of the offshore trestle is calculated, and the algebraic method is used to solve the inverse kinematics. At the same time, using the robotics toolbox in Matlab to verify the feasibility of the D-H parameter method modeling and the correctness of the forward and inverse solutions of the kinematics equation, and using the Monte Carlo method to analyze the working space of the offshore trestle in Matlab, finally, the motion of the offshore trestle is wave compensated. It provides a theoretical basis for the kinematics modeling, workspace analysis and control system design of large-scale offshore trestle.
Stability analysis of Jiguanshan Tunnel construction under karst tiankeng
Authors: Wan Fei , Zhang Xuan , Li Tangjun 
Published: May 2021

Abstract
The overlying rock mass under the tiankeng developes karst and thus has poor mechanical properties, which brings about great risks for the tunnel undercrossing construction. In order to determine the safety conditions of the tunnel and karst tiankeng during the undercrossing construction of the Jiguanshan Tunnel, a three-dimensional elastoplastic numerical model was established to analyze the deformation laws of the surrounding, deep and surface rock mass. The calculation results showed that the deformation of surrounding rock was dominated by settlement. With the longitudinal deformation of 57.3mm, the stability of the tunnel face was poor and the surrounding rock of the arch was prone to instability. The deformation of the surface tiankeng was slight. However, given that the uncertainty of karst development at the bottom of the karst tiankeng and the influence of tunnel construction blasting vibration, the surface rock was still at high risk of instability. The research results can provide references for the design of similar projects.
Study on Influencing Factors of Leakage of Epoxy Resin Grouting
Authors: Yu Tao , Su Huifeng , Zhang Xiudong 
Published: May 2021

AbstractAs a kind of grouting material, epoxy resin is often used to repair cracks in concrete structures and as grouting filling for reserved joints in prefabricated buildings. However, in engineering applications, gaps can be found between water-stop tape and concrete. Due to the low viscosity of epoxy resin, leaks easily occur during the grouting process. In order to study the influencing factors of leakage, numerical simulations were used to determine the leakage rate of epoxy resin between the size of the leakage aperture, the grouting pressure, and the viscosity of epoxy resin. The change of pressure at the position of the leak under different conditions was also obtained. The results showed that under different viscosities, the leakage velocity exhibits different laws to the area of the hole and the grouting pressure.
The application of SAP2000 in the recheck of Traffic Bridge of a certain sluice
Authors: Li Fei , Jin Quanhua 
Published: May 2021

Abstract
Using the bridge module of SAP2000 structure calculation software, can easily build bridge model, calculate bridge stress. Combination reinforcement module to check the condition of bridge reinforcement, thus to evaluate the whole safety of bridge. It is more convenient and reliable to use finite element software instead of traditional structure mechanics method.
Model test and analysis of soil displacement of cone-perforated column composite pipe pile under static pressure
Authors: Yang Yansong , Lei Jinbo , Deng Dingzhe , Zou Yongqiang 
Published: May 2021

Abstract
In view of the fact that there is relatively little research on soil squeezing effe ct of conical-perforated column composite pipe pile, the lateral displacement and surfa ce uplift of conical-perforated column composite pipe pile after single pile is pressed i nto soil are observed by static pressure pile sinking method, and the change law of soil lateral displacement and surface uplift during pile sinking is analyzed. It is found that the lateral displacement increases with the increase of pipe pile driving depth, and whe n the pipe pile is fully penetrated, the soil lateral displacement ends, and the influence range of soil lateral displacement is 2 days.
Analysis of factors affecting long-term coal demand in China Error correction model based on co-integration
Authors: Feng Xiwen , Xin Mingshang 
Published: May 2021

AbstractThis paper studies the long-term equilibrium relationship of coal in China fro m the perspective of energy structure and economic structure by using co-integration t echnology, data of China from 1980 to 2018 are selected in this paper and estimates th e long-term income elasticity, price elasticity, and the elasticity of economic structure and cross-price elasticity with natural gas; It simulates the evolution of long-term coal demand of various explanatory variables at different growth rates and gives policy cho ices. The results of the study indicate that the demand for coal is very sensitive to the c hange of economic structure and the adjustment of economic structure will greatly rest rain the demand for coal.; The change of producer price has little influence on the chan ge of coal demand; Considering the long-term course of economic development, the im pact of natural gas consumption on coal demand is increasing.
A Comparative Study on the Spatial Characteristics of Traditional Residential Houses in Zhangguying and Laodong Villages Based on Space Syntax
Authors: Zou Han , Liu Yang 
Published: May 2021

Abstract
This article is based on space syntax theoy combined with field surveys and mapping data, Using AutoCad and Depthmap to analyze and interpret the spatial characteristics of traditonal houses in Zhangguying Village and Laodong Village in Xiangxi Prefecture. clarifying the difference in spatial characteristics between the two spaces and the influencing factors behind the difference by comparing the integration degree of visible layer and the degree of integration of the feasible layer.
Application of Glass Fiber Concrete under Thin-Walled Middle Partition Wall Construction in Tunnel
Authors: Tian Yuanyuan , Wang Yigong , Nie Haixiang , You Hongyue , Zhang Junjie , Shao Tangsha , Pang Chuming , Zhang Xu , Wang Dong , Huang Peng , Wang Qingbiao 
Published: May 2021

Abstract
Aiming at the feasibility of applying glass fiber concrete as a new material to tunnel engineering, with the help of a combination of theoretical analysis, laboratory tests and engineering applications, the effect of glass fiber on the mechanical properties of concrete under different dosages and different lengths is studied. By monitoring the cracks in the middle partition wall, and applying the glass fiber to the middle partition wall in Laoshan Tunnel, to achieve the verification of the optimal length and the optimal mixing amount. The main conclusions are: (1) When the length of glass fiber is 12 mm, the tensile and compressive strength reach the maximum value; (2) Determine the optimal volume rate is 1% in order to prevent the concrete cracking effectively; (3) The crack resistance of the mid-board with glass fiber concrete is better than the ordinary concrete, which proves the feasibility of practical application of glass fiber concrete.
Stability control measures of soft and broken surrounding rocks of super-large section tunnel constructed using benching tunneling method
Authors: Wan Fei , Wang Bo , Fu Chongtao , Li Lei , Li Xuefeng 
Published: May 2021

Abstract
The tunnel face of the super-large section tunnel constructed using benching tunneling method tends to loss stability in the stratum with very poor surrounding rock grade (grade V). Therefore it is necessary to employ advanced support or optimize bench construction parameters to improve the stability of tunnel construction. In order to determine the stability control measures for the super-large section tunnel constructed using benching tunneling method in soft and broken surrounding rock, a three-dimensional elastoplastic model is established. Taking the extrusion displacement of tunnel face and the failure zone of surrounding rock as indices, the influences of bench height, bench length, circulating footage and other construction parameters and the construction of advanced large pipe shed on tunnel stability were analyzed. The calculation results show that when the tunnel is constructed using benching tunneling method, the surrounding rock within 4.5m in front of the tunnel face and 1.5m above the arch collapses, and the failure develops from the arch top down to the arch foot. The measures such as shortening the circulating footage, shortening the length of the bench and reducing the height of the upper bench have little effect on the stability of the tunnel, and the maximum difference among the strength reduction coefficients of the surrounding rock is 0.1 when the tunnel losses stability. The advanced large pipe shed can significantly improve the stability of benching tunneling method construction. The deformation and failure of the tunnel mainly concentrates in the side wall area, which gradually develops from the arch foot to the wall foot, and the depth of the surrounding rock failure zone is very limited.
Effect of Tempering Temperature on Microstructure and Uniformity of LP Steel Plate under HOP Process
Authors: Xiong Jie , Tang Shuai , Wu Chengyuan , Xu Ronghui , Sheng Xinjun , Liu Zhengyu , Wang Guodong 
Published: May 2021

Abstract
Longitudinal profiled steel plate (LP steel plate) is a green steel product, which is widely used in steel structure fields such as ships and bridges. In this paper, the effect of Heat-treatment Online Process (HOP) on microstructure and uniformity of LP steel plate was investigated by thermal simulation test. The results show that the microstructure consists of grain boundary allotriomorphs, upper bainite, acicular ferrite and carbon-enriched austenite at 550°C. During the isothermal process, the austenite transforms into bainite, the acicular ferrite grows and coarsens, and the bainite laths gradually “fuse” to form large granular bainite. After online tempering at 650°C, the austenite transforms into ferrite, acicular ferrite and bainite undergo tempering transformation, in which the size of bainite decreases and some acicular ferrite transforms into polygonal ferrite. After tempering at different temperatures (650∼750°C), the microstructure consists of grain boundary allotriomorphs, coarsened acicular ferrite and a small amount of granular bainite. With the increase of tempering temperature, the tempering transformation degree of acicular ferrite and bainite is intensified. Elongated carbides at grain boundaries become short rods and particles, which decreases the size and aggregation of carbides. Compared with the traditional process, the difference of microstructure and hardness of LP steel plate with different thickness specifications after HOP process is reduced, and the hardness is higher, which is beneficial to improve the performance and uniformity.
Study on New Type of Double-Sided Cooling Packaging Technology for Semiconductor Lasers
Authors: Wang Yuancheng , Qu Hongwei , Zheng Wanhua 
Published: May 2021

Abstract
A new type of double-sided cooling packaging technology for semiconductor lasers has been designed and fabricated. The Simulation results showed that the highest temperature of semiconductor has been reduced from 48.5°C to 40°C by using double-sided cooling design. Experimental results show that the maximum power increased form 14.1W to 15.1W, which proved that the thermal saturation effect of the laser is effectively alleviated by using double-sided cooling.
Research on High Sparse Sampling CT Image Reconstruction Algorithm Based on Convolutional Neural Networks
Authors: Luo Jiqing , Luan Feng , Liu Zhuxi , Zhu Junan , Song Lai , Wu Yuetong 
Published: May 2021

Abstract
CT plays an important role in medical diagnosis and industrial nondestructive testing. How to reduce the radiation to patients in the process of CT scanning has become a hot spot. An effective way is to use sparse sampling projection data to reconstruct the CT image. However, the image obtained by using the traditional CT reconstruction algorithm to deal with the sparse projection data has serious image distortion and artifact. This paper presents a CT reconstruction method based on CNN. This method learns the mapping relationship between the sparse projection data and the complete projection data in the training database, and uses the learned result to process the sparse sampling projection data. FBP algorithm is used to get the high resolution CT image. This paper uses CNN to carry out an end-to-end learning to repair the projection sinusoidal image with missing angle and improve the quality of CT image reconstruction.
The Exploration of Aerospace Engineering Project Management Method Based on System Engineering
Authors: Li Luning , Meng Ju , Yang Lingxiao , Cui Yapeng , Zhou Yongjun 
Published: May 2021

Abstract
Aiming at aerospace engineering project management, the practice of system engineering is given, and the difficulties and problems existing in aerospace development and the management contents that need to be strengthened in the future are put forward in this paper.
Research on Distribution Network Fault Recovery Reconfiguration Considering Distributed Generations
Authors: Guan Wanlin , Chen Cong , Lan Tian , Liu Yanlong , Rong Shuang , Jia Wenbo , You Chao , Liu Xinkai , Liu Huanyu 
Published: May 2021

Abstract
In view of the increasing penetration rate of distributed power in the distribution network, the traditional fault recovery reconfiguration method of distribution network needs to be further improved. An economic optimization model of distribution network fault recovery reconfiguration considering different types of distributed generations is proposed. This model takes into account the minimum number of switching operations as target and considers the impact of network active loss on restorative reconfiguration. Integer coding quantum particle swarm optimization algorithm is applied to the fault recovery reconfiguration optimization model and a fault recoverability discriminant method is presented. This method can classify the fault network into recoverable power-lossing area and non-recoverable power-lossing area. Recovering the fault recovery method given by the recoverable power loss area, and restoring the power supply to the unrecoverable power loss area according to the distributed power supply condition connected to the area. The simulation results show that the proposed method can be applied to the fault recovery reconfiguration of distribution network with distributed power accurately and efficiently.
Forecast and Suggestions on The Demand of Lithium, Cobalt, Nickel and Manganese Resources in China’s New Energy Automobile Industry
Authors: Hu Song , He Sichao , Jiang Xiaotong , Wu Meng , Wang Pan , Li Longhui 
Published: May 2021

Abstract
As the key resources of power battery production, lithium, cobalt, nickel and manganese have become important factors to ensure the healthy development of new energy automobile industry. In this paper, the distribution and application status of lithium, nickel, manganese and cobalt resources are introduced and briefly analyzed. Combined with the development trend of new energy automobile industry, the demand of lithium, cobalt, nickel and manganese resources in China’s new energy industry is reasonably predicted. It is estimated that during 2021-2025, 76,000 tons of lithium, 88,200 tons of cobalt, 219,600 tons and 128,000 tons of manganese will be consumed. Because there is a big gap between supply and demand of resources, it is suggested to enhance the development of local resources, optimize the overseas resource supply system and build a closed loop of resource recycling.
Analysis of The Impact of The New Infrastructure on Economic Growth——Based on Empirical Test Charging Pile of New Energy Vehicles
Authors: Yu Huanyang 
Published: May 2021

Abstract
Nowadays, with the digital economy gradually involving in the original economic state in China, Chinese industries have been undergoing economic transformation and upgrading. Specifically, Chinese society has a stronger demand for new information technologies such as 5G, big data and artificial intelligence accordingly. In the future, the new infrastructure is expected to play a key role in the high-quality development of China’s economy. Based on the information above, this paper summarizes the current academic research on the new infrastructure and explains the transmission mechanism of it to promote economic growth from six different effects. To verify the theory, this paper takes the charging pile of new energy vehicles as an example, using regression analysis of China’s provincial panel data from 2016 to 2020 to draw a significant positive conclusion, which is aimed to better meet the new infrastructure era and realize a new round of great development.
Analysis of Influencing Factors of New Energy Vehicle Satisfaction Based On Scenario Thinking and Catboost Model
Authors: Zhang Fan , Yang Jing , Liang BenShuang , He Hongjing 
Published: May 2021

Abstract
In order to accurately grasp the influencing factors of consumer product satisfaction with new energy vehicles, this paper uses scenario-based thinking as the framework and a large amount of multi-source heterogeneous data as the basis. Dimensional matching is performed on the structured data, and the random forest machine learning method is used to obtain complete sample data to reflect the overall market characteristics; thus, the CatBoost model is trained based on the complete sample data, and the degree of influence of each feature on satisfaction is analyzed. Through research and analysis, it is found that not only the performance of the product itself has a greater impact on product satisfaction, but the characteristics of consumers’ own attributes are also an important factor affecting product satisfaction. Based on the research conclusions of this article, it can provide reference and basis for the improvement of enterprise product satisfaction and precision marketing.
Research on Online Monitoring System for Dielectric Loss of High Voltage Equipment in Substation
Authors: Guo Yun , Xu Minhu , Zhang Hang , Zhang Rui , Zhang Kexin , Zhou Yang 
Published: May 2021

Abstract
In view of the remote collection of voltage and current in the online monitoring system for dielectric loss of high-voltage capacitive equipment in substations, it will lead to the problem of difficult to guarantee collection synchronization and large data transmission. The paper cleverly borrows AC 220V voltage as the reference phase, current and voltage monitoring terminal Calculate the phase relationship between the current, voltage and the reference phase of the capacitive device, and send it to the master station as an intermediate result. The master station calculates the dielectric loss of the capacitive device and forms a demand report. This method avoids the problem that the current and voltage acquisition is difficult to synchronize, and can greatly reduce the system cost and the amount of transmitted data. Because the terminals are calculated separately, the real-time performance of the monitoring system is improved.
Research on Key Technologies of High Voltage Power Cables in Smart Grid
Authors: Guo Yun , Xu Minhu , Shen Yubo , Cao Rong , Zhang Kexin , Zhao Xiangyu 
Published: May 2021

Abstract
The paper discusses important issues such as high-performance materials, electrical tree aging, space charge, insulation structure and technology, and cable operation detection in cable research and development. It is believed that DC cables will be used in power transmission for a long time in the future. It will receive more and more attention, but it is also facing the problems of insulation reliability and the development of new materials due to space charge and nonlinear temperature characteristics. The paper analyses the main reasons for the failure of power cables in the smart grid, and proposes several advanced power cable fault diagnosis technologies, and studies their principles and applications in order to improve the efficiency of fault diagnosis of the smart grid and protect the power grid. Operational reliability.
Single-phase Earth Fault Section Location Based on Differences’ Characteristics of Zero-sequence Currents in Distribution Network
Authors: Hu Xiuming , He Xudong , Xu Dan , An Yuqiong , Zhang Yi , Li Mei , Zhou Situo , Li Yuan , Huang Xiong 
Published: May 2021

Abstract
When a single phase earth fault occurs in distribution network, the difference between the transient zero-sequence currents at the head of the non-faulty section before the fault point is small, and the non-faulty section after the fault point also has this feature, but the difference between the zero-sequence currents at the head of the section before and after the fault point is big. Based on this, a method for comparing the single-phase grounding fault section location in distribution network based on the difference of the transient zero-sequence current was proposed. Based on the known distribution network structure, the fault section table was compiled, then the transient zero-sequence currents difference at the head of each section were compared, the fault section could be selected. The simulation by PSCAD/EMTDC verified the reliability of the method.
Research on Arc Trace of Switch on Load Breaking Based on LabVIEW
Authors: Su Jinzhou 
Published: May 2021

Abstract
In recent years, there are more and more electrical fire cases caused by the arc damage to the contact when the switch is breaking, so more attention is paid to the research of the arc trace when the switch is breaking with load. In this paper, starting from the analysis of switch breaking arc, the calculation method of three-phase and first open phase switch breaking arc is studied, and the arc trace test and analysis system is established based on LabVIEW. This system is used to test and study the distribution law of contact breaking arc trace of AC contactor under different opening phase angle, breaking current and breaking load test conditions, and the relationship between switch breaking arc trace and breaking area is given. Through the prototype test, a large number of test data are stored in the system database, which provides the test data and test basis for the design of high-performance switchgear, and also provides technical support for the real-time tracking, judgment and warning of product quality by using the historical data law in the operation process of low-voltage electrical circuit, so as to avoid causing electrical fire.