bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chemical Characteristics and Evolution of Shallow groundwater of Yellow River and Tuhai River Basin in Huimin area, Shandong Province, China
Authors: Wang Kuifeng , Xie Wei , Liu Wen , Wang Wei , Zhang Taiping 
Published: July 2021

Abstract
Based on data characteristics of hydrochemistry and hydrogen and oxygen stable isotopes of large area groundwater samples from two rivers basin (Yellow river and Tuhai River) in Huimin, Shandong, this paper makes a deep discussion of hydrochemical characteristics, recharge source and hydrogeochemical evolution process of groundwater. The results show that the shallow groundwater is alkalescent, hydrochemical type is Cl·HCO3—Na·Mg, total dissolved solids (TDS) vary from 751∼6501mg/L, mainly >1000mg/L, and the average is 1824mg/L; the main resources of shallow groundwater are atmospheric precipitation and Yellow River seepage; the groundwater is jointly effected by rock weathering and evaporation concentration, the Na+, Ca2+, Mg2+, Cl– and SO4
2- in the groundwater have very high correlation with TDS and total hardness. The extensive existence of Br indicates an inseparable relation between groundwater and seawater i.
The applications of Grey system theory in predicting the outburst of coal and gas in Linhuan Coal Mining
Authors: Cheng Hao 
Published: July 2021

Abstract
Coal and gas outburst is one of mine serious natural disasters. Grey cluster assessment of the grey system theory is used to predict the outburst of coal and gas in Huaibei Coal Mining Group Linhuan Coal Mining so as to have effective prevention and control on this kind of accident. This method will research the influence outstanding of various factors combined systematic analysis, through comparing the conclusion, thereby improving the forecasting accuracy. This method has the advantages of dynamic, predict accurately reflects exactly the mine coal and gas outburst rule, for the prevention and control of coal and gas outburst is ensured.
Study on Intelligent Inspection Scheme of Concrete Component Quality Based on Multivariate Data Link
Authors: Wang Wanqi 
Published: July 2021

Abstract
With the rapid development of information technology, construction project management has obtained better technical support, and intelligent site system has been widely used to improve management efficiency and quality. First, based on the intelligent site system, this paper elaborates the overall framework and detection objectives of intelligent detection in view of the current situation of concrete construction quality detection in railway construction projects. Second, based on the intelligence detection, taking the quality of concrete components as the research object, the resource management detection, technological process detection, component quality detection and process monitoring and detection schemes are proposed, which provide an important detection guarantee for the quality of concrete components in terms of safety and strength.
Study on The Technical Plan of Continuous Beam Rotation Construction Monitoring and Early Warning
Authors: Wu Sitong , Qian Jin 
Published: July 2021

Abstract
The rotating construction of the bridge is the better choice, the continuous beam rotation intelligent monitoring system was built by the Academy of Railway Sciences and was developed and applied based on the “Smart Construction Site” project of the Huzhou-Hangzhou Railway. Firstly, this article introduces the system. The system is based on Beidou’s high-precision satellite positioning solution system to calculate the attitude of the bridge during the construction of the rotating body. The key stress level and change of the bridge can be obtained through the stress sensor,which can obtain the response trend of the pontic structure, and effectively control the stress damage and dangerous points in the first time. Secondly, it continuously moitors the temperature and humidity of the rotating bridge, wind speed, bridge pier strain, inclination angle, and rotation angle in real time during the entire course of the bridge rotation to ensure the safety of construction. Thirdly, points out the location of the sensor buried in the foundation pit during the bridge construction process. Finally, the principle and composition of the bridge health warning technology scheme based on BIM technology are introduced, and its significance and advantages are summarized. Provides solutions and experience for the long-term monitoring of bridges in rotating construction.
Overview of Tunnel Boring Machine Dynamic Balance Construction
Authors: Gao Huan , Liu Chang , Man Ke 
Published: July 2021

Abstract
The concept of Tunnel Boring Machine (TBM) dynamic balance construction has been put forward here, i.e. 5S TBM construction. Among them, Suitability refers to the matching degree between TBM equipment and geological conditions, the matching degree between TBM equipment and construction scheme, the dynamic adjustment ability of TBM in the face of different geological conditions, and the induction and analysis of geological exploration results. Sustainability refers to TBM construction is continuous, not interrupted by uncontrollable factors, the operation of each process is continuous and the connection is compact, the speed of each stage is basically balanced. And the maintenance time, the number of tool changes and the frequency of tool changes are basically the same. Speedy refers to under the same geological conditions, maintain a consistent and rapid tunneling speed. When the geological condition is good, the equipment completion rate and tunneling footage maintain efficient, while for bad geological conditions, the tunneling footage and support time maintain relatively efficient. And with a reasonable material transport scheme, reasonable slag discharge scheme, reasonable support scheme, equipment integrity rate and pure tunneling time utilization ratio. Safety refers to the safety of staffs and TBM equipment in the process of construction and maintenance of equipment, standardized operation of each process, advanced detection of geological prediction. Safeguarded of environmental protection refers to TBM equipment itself and excavated chambers and tunnels should be kept clean. Long working conditions need ventilation, cooling, noise removal, vibration reduction measures, sanitary conditions measures. Furthermore, combined with the II bid of Water Supply Project in Jilin, the TBM construction has been realized with the average monthly intact rate of 94.7%, the highest reached to 98.06%, the average utilization rate of 56.85%, the maximum utilization rate of 75.6%, and the average monthly footage of more than 600 meters. It shows that the operation method of TBM dynamic balance construction has been well verified in this project.
Study on the Soil Structure and Construction Technology of Large Span Double-Arch Tunnel Entrance
Authors: Dong Jiansong 
Published: July 2021

Abstract
In the construction process of tunnel engineering, the construction of the entrance section is one of the crucial procedures. How to improve the construction efficiency and ensure the stability of the tunnel entrance section needs to be considered. Based on the project of a double-arch tunnel, this paper studies the construction techniques of the entrance of the urban double-arch tunnel with a large span. Based on the numerical simulation, it is proved that the construction of tunnel entrance by opening up a cross passage is feasible.
Application of Drilling Strain Analysis Technology in Mine Dynamic Geological Disaster Monitoring
Authors: Li Guilin , Wu Qinzheng , Liu Huanxin , Cheng Li , Liu Yang , Wang Xi 
Published: July 2021

Abstract
This article applies the borehole strain observation technology to mine dynamic disaster monitoring for the first time, and uses the fractal box dimension to quantitatively analyse the time history change characteristics of borehole strain data and its correlation with rock bursts. The article uses the drilling multi-parameter test device to test in the mine, and judges the stress distribution by collecting the drilling parameter data obtained from the test hole of the working face of the test point. The study found that the application of borehole strain observation technology to mine dynamic disaster monitoring can directly and accurately record the micro-dynamic change process of rock mass in the area before and after the occurrence of rock burst. The fractal box dimension can quantify the complex changes and evaluation of strain data. Abnormal degree of water tide distortion.
Mechanical Properties and Energy Conservation Analysis for The New Connection of The Fabricated Shear Wall
Authors: Fan Handuo , Zhang Yueguo , Zhang Yichao , Jiang Haowen , Du Linghang , Liu Qikai 
Published: July 2021

Abstract
In order to investigate a reliable reinforcement connection form for the assembly nodes of the fabricated reinforced concrete shear walls with joint seams, and explore a reinforced bars lap splice method with easy control of construction quality, a new type of reinforced bars lap splice method with the additional X-shaped reinforcement at the assembly nodes is proposed. By changing the width of the assembly nodes, three fabricated shear wall models were designed. By using Abaqus finite element analysis software, the full-range numerical simulations of its mechanical properties under static load were carried out to study the behaviors of the new reinforced bars lap splice method, which were compared with the behaviors of the cast-in-place monolithic shear wall with the same design parameters and analyzed. The results show that the additional X-shaped reinforcement changed the force transmission path of the reinforced bars lap splice at the assembly nodes and reduced the cross-sectional stress of lap splice area, and improved the reliability of the weak part of the fabricated shear walls. The method also reduced the difficulty of assembling fabricated shear wall structure. Comparing the fabricated shear walls in the same assembly position, the analyses show that the reinforced bars lap splice with the additional X-shaped reinforcement is not sensitive to joint seam width, which can realize the shear walls can assemble with small seam width, and effectively improves prefabrication rate.
Research and application of micropile technology on expansive soil and saline soil in geotechnical engineering
Authors: Xie Xiao , Wang Luyao 
Published: July 2021

Abstract
Micropile has the advantages of flexible pile arrangement, small construction area, strong applicability to soil, convenient and fast construction, etc. Therefore, it has been widely used in many fields of geotechnical engineering in recent years. The unique advantages of the micropile gradually emerged in some special occasions. Based on the collection of domestic and foreign literatures, this article makes a more comprehensive summary and introduction of the concept, characteristics, materials, classification and application development history of micropiles. The work of this article will provide a theoretical basis for the theoretical research and engineering application related to the micropile technology.
Numerical investigation on the leaked nature gas diffusion of underground gas pipeline through soil to atmosphere
Authors: Zhang Tiantian , Qin Yuxin , Han Dongliang , Luo Zonglin , Tan Yufei 
Published: July 2021

Abstract
When the buried gas pipeline leaks due to corrosion, aging, overload and other reasons, serious safety accidents are easy to occur. In this paper, a three-dimensional numerical model is established to simulate the underground gas diffusion from the directly buried pipeline, through the soil to the atmosphere. Using the model, the diffusion characteristics under the conditions of different initial pipeline pressures and different soil porosities are comparatively simulated and analysed. As indicated by the numerical results, when pinhole leakage occurs, the gas concentration exhibits a symmetrical distribution in the horizontal and axial directions. The gas content gradually reduces, as the distance from the leakage point increases. The diffusion process and gas content are largely determined by the initial leak pressure, as well as the flow resistance in accordance with the soil porosity.
First-principles study on hydrogen storage properties of Ti8C6 cluster
Authors: Wu Xueke , Zhang Song , Zeng Fanju 
Published: July 2021

Abstract
The geometric structure, energy gaps of molecular orbital and hydrogen absorb capacities of Ti8C6 clusters are investigated by first-principles based on density functional theory. The results show that the bond length of hydrogen molecules decrease and the Ti-H bond length of Ti8C6(H2)n clusters increase with the increase of hydrogen molecules adsorbed by Ti8C6 from 8 to 40. Moreover, the Ti8C6(H2)40 cluster not only exhibits strong stability according to energy gap analysis, but also absorbs 40 hydrogen molecules with gravimetric density of 15.05 wt%, which will be considered as a candidate material for hydrogen absorption.
Coordinated Control and Energy Management System of Microgrid Group
Authors: Wang Yanan 
Published: July 2021

Abstract
As an important part of the smart grid, the operation control of the microgrid group is the key technology to maintain its safe and stable operation. The reasonable distribution of microgrid energy is closely related to the stability of system control. Multiple micro-grids in a certain area are uniformly regulated and controlled to form a micro-grid group operation mode. Aiming at the operation and management requirements of the multi-energy complementary microgrid group, the article proposes a design scheme for the energy management system of the microgrid group. The entire system has high operational reliability and economy, and has certain engineering value for improving the comprehensive benefits of the microgrid.
Research basis of muon imaging applied in reactor core monitoring
Authors: Qiao Yanlong , Gao Liang , Fang Qishu 
Published: July 2021

Abstract
Muon imaging technology has been applied in many fields. The exploratory application of muon imaging technology after the Fukushima nuclear accident provides enlightenment for the application of nuclear core safety monitoring under serious accidents. In this paper, the muon imaging technology is introduced from the aspects of technical principle, muon detection technology, imaging algorithm and application, so as to provide ideas and methods for the application of muon imaging technology in nuclear core safety monitoring.
Research on Two-layer Cooperative Optimal Allocation Method of Integrated Energy System
Authors: Li Hua , Liu Dunnan 
Published: July 2021

Abstract
Integrated energy system is one of the effective means to improve the operating economy of China’s energy system, reduce pollution emissions and improve energy utilization efficiency. The upper model solves the planning problem of the integrated energy system, and inputs the planning scheme into the lower model. The lower model realizes the operation optimization of the integrated energy system within the life cycle based on the given planning scheme. Through the iterative updating of the upper and lower models, the optimization of the plan-operation scheme is realized.
Analysis of conductivity of ZnO/LDPE Composites
Authors: Shen Yubo , Zhang Jian , Zhang Dewen , Sun Wei , Zhou Hongyi , Liu Heqian , Zhang Peng 
Published: July 2021

Abstract
The composites prepared by adding zinc oxide into polymer have been widely studied and applied because of their special properties of self homogenizing electric field distribution in non-uniform electric field, inhibiting space charge and electrical tree growth. In this paper, the effects of inorganic filler concentration and particle size on the conductivity of ZnO/LDPE Composites were studied by voltammetry combined with high voltage DC power supply and picoammeter to measure applied voltage and through current.
Lightning Shielding Failure Analysis of High Voltage Transmission Lines Based on Leading Development Model
Authors: Liu Yonghuan 
Published: July 2021

Abstract
Lightning strikes are one of the important causes of line faults. With the increase of voltage levels, the proportion of short-circuit trip accidents caused by shielding strikes is increasing. Therefore, accurate evaluation of the line’s shielding lightning resistance is important for power systems. Its safe and stable operation is of great significance. In this paper, based on the derivation of the pilot development model (LPM) for evaluating the shielding characteristics of the line, taking the 500kV single-circuit line network of the East China Power Grid as the research object, the lightning shielding trip rate and related influencing factors are analyzed and calculated, and the methods for enhancing the lightning protection performance are given. Measures.
Structural Design and Thermal-mechanical Coupling Analysis of a Novel Automobile Magnetostrictive Actuator
Authors: Jia Xingjian , Chu Changbao , Zhou Xiangfeng , Xiao Yue 
Published: July 2021

Abstract
This paper takes automobile disc brakes as the research object, and designs a novel magnetostrictive disc actuator based on the characteristics of large output force, high displacement resolution and fast response speed of giant magnetostrictive material. Based on the vehicle parameters of a new energy vehicle as the design basis, calculate the specific structure and size of the magnetostrictive actuator, and use CATIA software to complete the system parametric modeling, import the built model into COMSOL Multipysics. The simulation results show that the output displacement and output force of the actuator can meet the requirements of braking, and the maximum temperature of the surface of the friction pair is far from the temperature limit of the brake, the rationality of the design and the correctness of the simulation model are verified.
Study on vehicle internal organization fault and performance detection based on mechanical vibration feature extraction
Authors: Hao Lei , Jie Yanliang 
Published: July 2021

Abstract
Vehicle mechanical fault diagnosis is of great significance to ensure the safe and stable operation of vehicle mechanical equipment. The method of vehicle mechanical fault feature extraction based on independent component analysis is studied. Firstly, multi-domain features such as time-domain features, frequency domain features, and EEMD energy features of vibration signals are extracted, and a multi-objective optimization function containing the correlation, monotonicity, and robustness of each feature vector is introduced as the degradation feature evaluation function. Through the independent component analysis of the vehicle mechanical fault signals of different working conditions, the independent components of the signals of various working conditions are obtained, and these independent components contain some inherent characteristics of the vibration signals of the working conditions. Through the vehicle, internal organization fault, and performance testing test, the accuracy and effectiveness of the proposed method are proved, with high prediction accuracy and robustness, which has important guiding significance for engineering practice.
Design of combined heat and power micro grid system in plateau area
Authors: Pu Zewei 
Published: July 2021

Abstract
In order to build a cogeneration microgrid system suitable for the special environment and climate conditions of Tibet Plateau, This paper is mainly through the corresponding generation, transmission and distribution network, to achieve the transmission of electric energy, at the same time reasonable selection of heating equipment and heat dissipation device, under the premise of ensuring the reliability and safety of heating, improve the efficiency of energy utilization, and then achieve the absorption and flexible operation of clean energy (photovoltaic), so as to improve the comfort of the demonstration site.
Phase-Shifted TAB Converter System for Electric VTOL Aircraft
Authors: Fang Zixuan , Callegaro Leonardo 
Published: July 2021

Abstract
This paper investigates a triple-active-bridge converter for an all-electric VTOL(Vertical Take Off&Landing) aircraft, based on the Dual-active-bridge converter, presenting four working scenarios which matching the operating of e-VTOL. The converter adopts a phase-shifting control strategy and decouples the control network. Different targeted settings of the converter system are made for the various operating states of the e-VTOL, and the operating states of the TAB converter in different modes are simulated in MATLAB. The experimental results show that the TAB converter has more diverse operating modes, which can match future e-VTOL use in urban applications.
Design and Research of Transformer Disassembly and Assembly Vehicle with Lifting, Clamping and Pushing Functions
Authors: Ren Shuang , Zhai Guanyu , Qian Yong , Liu Hongwei , Wang Xiaobing 
Published: July 2021

Abstract
The disassembly and installation of distribution transformer is widely involved in the field of distribution network construction and maintenance in power system. In the traditional installation method, cranes and ropes are used to hoist the distribution transformer. Many safety accidents have caused by crane operation. Therefore, it is very necessary to design a special equipment that can successfully install and dismantle the transformers without changing the transverse wire, and fit the narrow space of the two concrete poles on the platform.
Stress analysis of screw connection of key structural components in pump turbine
Authors: Chen Liu , Li Hailing , Yu Jixing , Luo Yongyao , Wang Zhengwei , Zhu Xingbing , Zhao Zhiwen , Lu Xiaokang 
Published: July 2021

Abstract
In the structure of water pump turbine unit, the top cover and the seat ring structure are the key structural components, and the high-strength bolts distributed in the circumferential direction are usually used to connect. With the increase of the unit capacity and size, the number of connecting bolts is increasing gradually, so as to ensure the effective connection of key structural components. Taking a mixed flow pump turbine of a pumped storage power station as an example, the finite element calculation of the joint screw pair structure of the head cover and the seat ring is carried out under different working conditions. The stress distribution law of the screw pair is studied in this paper, which provides important theoretical basis and design reference for the practical engineering application of the head cover ring connection of the pump turbine.
Research on Electric Energy Peak-Valley Time Division Method Based on Supply-Demand Ratio
Authors: Liu Dunnan , Li Hua , Wang Lingxiang , Dong Zhixin 
Published: July 2021

Abstract
With the increase of the proportion of renewable energy, the traditional period division method based on load curve is no longer suitable for the new power system. Considering the development trend of renewable energy, a method for dividing peak and valley periods based on the ratio of supply and demand was proposed. According to the ratio of power supply and load demand, the peak and valley periods were divided by K-means algorithm. By comparing the period division method based on load curve with the period division method based on supply/demand ratio curve, the validity of the peak/valley period division method based on supply/demand ratio proposed in this paper is verified.
Research on the layout of battery pack for plug-in hybrid vehicle
Authors: Yang Guang , Cao Yong , Zhan Guoqiang , Zeng Qi , Chen Qi 
Published: July 2021

Abstract
The layout of battery pack for plug-in hybrid car is usual a difficult problem. The layout analysis involves the balance of battery pack capacity, ride space, passability and other performance. Through dimensional chain analysis, this paper refines each problem, balances each performance, and obtains a reasonable scheme. This paper also studies the layout of the battery for the expansion of electricity. At last, the layout method of battery pack for plug-in hybrid vehicle is summarized.