bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the design and forecast method of complex fracture in shale oil formation in at Da’anzhai Formation in the Sichuan Basin
Authors: Fan Yu , Zhou Changlin , Liang Jun , Zeng Ji , Zhang Dandan , Luo Le 
Published: July 2021

Abstract
The exploration of lacustrine shale oil and gas located at Da’anzhai Formation in the Sichuan Basin has entered into the development stage, and the horizontal well volume fracturing is the main stimulating technology for shale oil and gas development. To solve the problems of the accurate description of induced stress, complex fracture design, and poor match in geological engineering, the complex fracture design model is developed by the extended finite element method and augmentation Lagrange multiplicator method in consideration of the contact problem of natural crack. And the induced stress distribution characters and mechanism of complex fracture propagation are analyzed. It is found that as for the stimulation measure for the formation developed a natural crack, the fracturing fluid with lower injection rate are smaller viscosity is suggested to generate complex fracture due to the strong stress interference. Moreover, applying the proposed design method of complex fracture to a well in Da’anzhai Formation, it is shown that the results were basically close to the on-site results.
Study on Pouring Quality Evaluation of Mass Concrete Component
Authors: Xie Yalong 
Published: July 2021

Abstract
Mass concrete component pouring quality evaluation is an indispensable link in the construction of basic engineering. This article takes the Fuchun River bridge built during the construction of the Huzhou-Hangzhou high-speed railway as an example, using electronic temperature measurement and ultrasonic testing to assess the bridge the quality of the mass concrete components poured during the construction process is evaluated, and the detection results are transmitted to the smart construction site system in real-time. The real-time monitoring and evaluation of the casting quality has been achieved. The evaluation results are that the Fuchun River Bridge was poured during the construction process. The quality of mass concrete components meets the marking requirements. Suggestions on the later maintenance of concrete components are given for reference for other engineering projects.
Study on quality and safety monitoring scheme of tunnel construction based on 3D laser scanning
Authors: Qian Jin , Zhou Yanhui 
Published: July 2021

Abstract
In the process of railway tunnel construction, it is very important to monitor and predict the subgrade settlement. In order to solve the problems of low efficiency, high cost, low accuracy and hidden safety problems in the detection of tunnel construction quality and safety by manual hand-held radar, this paper studies the construction quality and safety detection scheme of Lushan Tunnel, a new railway connecting line of Huzhou-Hangzhou high-speed railway. Firstly, the settlement and deformation observation points are set up on both sides and near the middle of the tunnel invert. Secondly, the observation elements are buried according to the specified scheme. Then set the monitoring frequency of the original parts after different working procedures to monitor the settlement of the roadbed after tunnel construction. Finally, the curve regression method is proposed to predict and evaluate the tunnel foundation settlement. This scheme mainly solves the problems of low precision and low efficiency in the traditional monitoring scheme. It can continuously monitor the construction quality in real time and predict and monitor the subgrade settlement in the process of tunnel construction.
Study On the Influence of Micro-Steel Pipe Pile Reinforcement and Soil Structure on Landslide Stability in Geological Engineering
Authors: Xie Xiao , Wang Luyao 
Published: July 2021

Abstract
Micropile is a new type of supporting structure, which is characterized by rapid and convenient construction, flexible pile layout and significant reinforcement effect. In this paper, combined with a landslide case, the influence of micro steel pipe pile reinforcement on the displacement, stress, strain and stability of the landslide is preliminarily studied by using finite element analysis simulation software. The results show that the reinforcement of micro-steel pipe piles improves the slope stability, but it is still in an unstable state. In the later stage, the landslide can be effectively controlled by adjusting the reinforcement scheme and the parameters of piles, such as material grade and pile density.
Formation age and geological environment of monzonitic granite from Qingshanpu pluton on the eastern margin of Longshou, Gansu
Authors: Zhu Quanlong , Guo Zhifeng , Wang Shengyun , Chen Jinyong , Qiu Ruizhao , Zhou Su 
Published: July 2021

AbstractZircon U–Pb dating, geochemistry, and Sr–Nd–Hf isotope data are reported for monzonite from the Qingshanpu pluton on the eastern margin of Longshoushan. The zircon LA-ICP-MS U–Pb age data showed that the emplacement age of the monzonite is 442.6 ± 4.8 Ma. The rocks are characterized by high SiO2contents (73.15%–73.85%), high K2O contents (3.67%–3.99%), and low P2O5contents (0.042%–0.049%). The aluminum saturation index was 1.03–1.05, and the molecular number of standard corundum was 0.58%–0.77%. Rocks are enriched in Rb, Sr, U, K, and Pb and depleted in Nb, Ti, Zr, P, and Eu, thereby indicating that they are weakly peraluminous I-type granites. The monzonite in the Qingshanpu pluton had lower ISrvalues, which ranged from 0.70850 to 0.70904, and the εNd(t) values ranged from -8.54 to -6.49. The εHf(t) values ranged from -9.75 to 0.42, and the two-stage model age TCDMranged from 1406 to 2043 Ma. This study concluded that the North Qilian subducted beneath the Alxa Plate at the end of the Early Paleozoic, causing elastic collision and eventually leading to closure. During elastic collision, several parts of the orogenic belt collapsed and were dismantled. The remelted ancient crust mixed with a small amount of mantle material during its ascent and finally formed the Qingshanbao pluton.
Shaking Table Test of Microbial Damping Layer of Tunnel Crossing Fault in Underground Soil Structures
Authors: Peng Shuquan , Zhou Qiwen 
Published: July 2021

Abstract
In this paper, relying on the East Africa Great Rift Valley Railway Tunnel Construction Project, based on the MICP (Microbial Induced Calcite Precipitation) technology, the microbial cemented tunnel shock-absorbing layer is made by using geogrid and rubber particles. Through the design of two sets of shaking table tests, the comparative analysis has The response characteristics of the cross-fault tunnel without microbial damping layer to seismic waves are simulated to study the anti-seismic effect of the microbial damping layer. The results show that the microbial damping layer can effectively reduce the peak acceleration intensity of the surrounding rock at the fault, with a reduction of 21.28% under the E1 wave and 54.92% under the Kobe wave. Both the peak acceleration and the strain of the tunnel lining decreased. At the same time, the microbial damping layer can reduce the acceleration difference between the left and right lining of the tunnel at the fault. The difference is reduced to 12.92% under the E1 wave; the difference under the Kobe wave is reduced to 8.82%, making the lining close to stability under vibration. The research results can provide a reference for the shock absorption of the Great Rift Valley Tunnel Project in East Africa and the application of microbial materials.
Research on Design and Construction Technology of Large Span T-Truss Suspension Beam
Authors: Meng Zhaohu , Wei Wanlong , Han Guangzhao , Yu Ziqiang , Lu Jianrong , Wu Minglei , Zhang Jun , Yu Jia , Jin Dongyang 
Published: July 2021

Abstract
Urban subway construction is often in the lower part of the city center road, and there are many municipal pipelines and pipelines in the lower part of the road. Because it involves the life of the surrounding residents, it is difficult to move and change. In the open excavation of foundation pit, the whole suspension construction measures are often used to solve this problem. Within the excavation area of the Yingmentan Station passageway of Lanzhou Rail Transit Line 1, there is a steel pipe municipal water supply pipeline. This municipal water supply pipeline needs integral suspension protection, with a suspension span of 22.5m. The design adopts T-shaped truss beams for overall suspension. This paper uses T-shaped beam design and force analysis research. Provide reference for similar projects.
Spatiotemporal Change Analysis of Annual Average NDVI in Qinling Mountains as Ecological Security Barrier and Dividing Line between Geography and Climate
Authors: Li Jianfeng , Zhang Lulu , Ye Huping 
Published: July 2021

Abstract
Based on Google Earth Engine cloud platform and MOD13Q1-NDVI images, this paper analyses the spatiotemporal variation characteristics of vegetation cover in Qinling area and its five watersheds from 2000 to 2020 from the perspectives of annual average NDVI. The results show that: 1) Since 2000, the vegetation cover in Qinling Mountains has shown a fluctuating growth trend, with annual average NDVI above 0.4, the maximum value in 2016 and the minimum value in 2001. There are obvious differences in the annual average NDVI of the five major basins, the fluctuation range of the Danjiang River Basin is the largest, the fluctuation trend of the Hanjiang River Basin and the Jialing River flow is similar, and the annual average NDVI of the Nanluo River Basin as a whole is the lowest. 2) The change characteristics of annual average NDVI in the four five-year periods from 2000 to 2020 are different, the decreasing area of annual average NDVI in the first two five-year periods is obviously larger than the increased area, and the degree of vegetation cover continues to worsen; in the third five-year period, the annual average NDVI increased almost in the whole study area, and the vegetation cover improved rapidly. The change range of annual average NDVI in the fourth five-year period is the smallest, and the proportion of unchanged area is more than half.
Evaluation of Low-Carbon Benefits of Smart Grid Based on Random Forest Algorithm
Authors: Chen Lingxuan , Xie Pengyang , Ma Shuaihua , Yang Chen 
Published: July 2021

Abstract
The eventual exhaustion of non-renewable fossil energy and the damage to the environment during its mining, processing, and consumption process have caused countries around the world to pay attention to how to improve energy efficiency, how to better develop clean energy, and how to optimize the energy structure. Electric energy is an indispensable secondary energy source of both industrial development and home life. How to convert clean energy into electric energy and improve the efficiency of electric energy used provides new ideas about solving energy shortages and environmental pressures. Smart grid is the application of advanced communication and information technology to all business links involved in the power grid. It is of great significance of the realization of information, automation and interaction of the power grid. It has become the development trend of the modern power grid. It can be seen that the construction of smart grids is an important way for countries around the world to alleviate the pressure on energy and environmental protection. This paper summarizes the current research status of smart grids at home and abroad, and combines the characteristics of smart grids with the problems existing on the research on low-carbon benefits of smart grids at home and abroad, and constructs a comprehensive evaluation index system suitable for low-carbon benefits evaluation of smart grids and low-carbon benefits of smart grids. Evaluate the model, use the analytic hierarchy process to preprocess the data, confirm the weight of each indicator system, and get the evaluation score; divide the processed data into a training set and a test set, and use the random forest algorithm to train the model; The evaluation model is used to evaluate the low-carbon benefits of smart grids. The evaluation results show that the model has high evaluation accuracy and certain practicability. Finally, based on the evaluation results and the status quo of smart grids in my country, corresponding suggestions are put forward to promote the further development of low-carbon smart grids.
Analysis of the Impact of AHP-based Power Grid Transmission and Transformation
Authors: Kang Yanfang , Guo Xiaohan , Xi Xiaojuan , Li Lingyun , Li Dapeng 
Published: July 2021

Abstract
In recent years, the changing trend and causes of power grid engineering are diversified and complicated. In view of this problem, it is impossible to determine the influencing factors by quantitative analysis. Selection in order to solve this problem, we collect relevant power transmission project data, since 2015. First, we determine the control index system, 20 factors affected substation project, 19 influence factors affected route project, and then use AHP method to establish the new situation under the background of grid engineering control model. Through the MATLAB software, we determine the weight of each influence factor. Finally, the factors that have great influence on power grid engineering control are obtained according to the order of weight. Thus, it lays the foundation for the orderly development of better control grid engineering in the future.
Numerical study on the influence of shroud cavity in the high-pressure centrifugal compressor for compressed air energy storage system
Authors: Meng Chong , Zuo Zhitao , Sun Jianting , Liang Qi , Guo Wenbin , Chen Haisheng 
Published: July 2021

Abstract
As a key energy equipment of the compressed air energy storage (CAES) system, the centrifugal compressor with shroud cavity is employed to avoid the leakage flow from the rotor, especially in the high-pressure stages. In order to clarify the leakage characteristics and its influences, the high-pressure centrifugal compressor with shroud cavity is taken as the research object in the present work. First, the leakage flow across the shroud cavity has been studied numerically, it’s found that there are negative effects on the high-pressure compressor’s aerodynamic performance by the shroud cavity. And then, the flow characteristics inside the shroud cavity are showed by finding several secondary flow regions and cavity vortices. In addition, through the entropy contours and streamlines, the influence on the main flow by the leakage are analysed in detail. By analysing the influence of the shroud cavity on the high-pressure compressor, this paper can provide a practical guidance for the design of the impeller in the CAES system.
Suggestions on efficient development and utilization of solar energy resources in Tibet
Authors: Pu Zewei 
Published: July 2021

Abstract
Tibet’s special geographical location makes it rich in clean energy resources, including renewable energy such as hydropower, solar energy, geothermal energy and wind energy. The advantaged clean energy resources not only provide advantaged resource advantages for the development and utilization of clean energy in Tibet, but also lay the foundation for accelerating the strategy of energy structure adjustment. By the end of 2020, the total installed power capacity of Tibet has reached 4.0185 million kilowatts, of which the clean energy sector is growing rapidly. The installed capacity of hydropower, wind power, geothermal power and solar photovoltaic power generation in the same period has reached 3.58 million kilowatts. Clean energy accounts for 89.09% of the total installed power generation capacity, while the installed capacity of photovoltaic power generation is about 1.5 million kilowatts, accounting for 37.33% of the total installed capacity, Second only to hydropower. However, there is still a lot of room to improve the utilization of solar photovoltaic.
Research on a Steel Stranded Molding Device for Distribution Network
Authors: Qian Yong , Ren Shuang , Zhai Guanyu , Wang Xiaobing , Shen Amei 
Published: July 2021

Abstract
There are many power grid upgrading and transformation projects in the system. The installation of cement poles is generally involved in the construction of power distribution lines, which involves the field production and cooperation of steel strands and composite fittings. The traditional method of making stay wire is to bend the steel strand (stay wire) by hand and to change its shape by hammering to adapt to the groove position of stay wire fittings. In order to improve the speed of drawing wire and improve the process standard, the author developed a steel stranded molding device, which is specially used to mold the steel strands.
Two-stage Optimal Dispatch of Multi-type Energy Coupling System Using Particle Swarm Optimization for Cool-Heat-Electricity
Authors: Zhang Xin , Jiang Jinpeng , Zhang Jihong , Zhang Zilei 
Published: July 2021

Abstract
As the larger error between the dispatch plan of the previous day and the actual operation of the community multi-type energy coupling system, the actual operation cannot be fully meet. A two-stage optimization dispatch method of the community multi-type energy coupling system based on the particle swarm algorithm is proposed in this study. Firstly, the optimal dispatch model of community multi-type energy coupling system on previous day is established. Minimizing the daily operation cost is the objective function. The optimal dispatch curve of community multi-type energy coupling system on previous day is obtained. Secondly, based on the optimal dispatch curve of community multi-type energy coupling system on previous day, an intraday correction model is constructed. The example results show that the proposed model can eliminate the dispatch error of the previous day and realize the optimal operation of community multi-type energy coupling system.
Research on Multi-Objective Optimization of Household Photovoltaic Energy Storage and Grid System
Authors: Zhou Zelong , Liu Meifeng 
Published: July 2021

Abstract
With the integration of large-scale photovoltaic systems, many uncertainties have been brought to the grid. In order to reduce the impact of the photovoltaic system on the grid, a multi-objective optimal configuration strategy for the energy storage system to discharge electricity into the grid is proposed. On the basis of the time-of-use electricity price, the total load variance and the user’s profits are taken as two objective functions. Constraints such as the maximum discharge power limit of the energy storage system are taken into account and a multi-objective optimal scheduling model for the centralized discharge of the energy storage system is established. A multi-objective genetic algorithm is used to solve the optimization model. The calculation results of MATLAB verify the feasibility and effectiveness of the strategy and the influence of different energy storage system capacities on the optimization results are also analyzed.
Short-Term Wind Speed Prediction of Wind Farms Based on Particle Swarm Optimization Support Vector Machine
Authors: Yu Xin , Zhang Zhongxuan , Song Mingxuan 
Published: July 2021

Abstract
With the large-scale integration of wind power into the grid, grid-side instability caused by fluctuations in wind speed is becoming more and more significant, and the topic of wind speed prediction for wind farms is urgent. Based on this, in order to solve the problem of low prediction accuracy of a single support vector machine, this paper proposes a wind speed prediction method that uses particle swarm optimization to optimize the support vector machine. Use particle swarm algorithm to optimize the selection of penalty factors and kernel function parameters of support vector machines, then conduct model training on the optimized parameters, and then apply the established prediction model to wind speed prediction of wind farms, and finally analyze the prediction results. The prediction results show that the support vector machine algorithm optimized by the particle swarm optimization algorithm has better accuracy in predicting the wind speed of wind farms, which is significantly higher than the prediction accuracy of a single support vector machine.
Study of thermal effect of lightning current on a metal roof
Authors: Zhang Biao , Zhou Junchi , Wang Yuzhi , Deng Daoyang 
Published: July 2021

Abstract
Metal roofs have often been seen as substitute of traditional materials such as concrete these years. Most metal roofs are made of AL-Mn-Mg alloy, which is lighter in weight, cost-effective in price and easier to construct. But it also has much higher probability of being struck by lightning due to its electrical conductivity. This work is dedicated to study the effect of lightning current on it. Firstly, we established a simplified Positive Cathode Voltage Drop model to calculate the fusion volumes and depth of lightning-burnt metal when it was struck by maximum lightning current of 200kA. Then in the lab, we introduced simulated lightning current with 10/350 waveform to a series of 1.17mm AL-Mn-Mg alloy samples, which are wildly used as power substation roofs in Jiangsu Province. The impulse current was set at 20kA,30kA and 50kA. When struck by a 50kA simulated current, the sample alloy had significant fusion marks, caused by electric arc between the metal surface and the discharge probe. But the alloy sample was not penetrated, which conformed to theoretical calculation. So we could come to the conclusion that a roof made of 1.17mm AL-Mn-Mg alloy will not be fused through by a typical lightning stroke.
Study on Wastewater Treatment Technology and Water Environment Protection Method
Authors: Yang Rongrong , Meng Qingjun 
Published: July 2021

Abstract
Water resources are very important for human beings, and water resources are indispensable for normal life and industrial production. With the population growth and industrialization in China, the shortage and pollution of water resources are becoming more and more serious, which not only restricts the further development of our society, but also has a serious impact on people’s lives. Emulsions are widely used in metal processing. Waste emulsions are hazardous wastes, which can cause serious harm to the ecological environment and need to be properly treated. The results show that the oil removal rate of different emulsion wastewater is over 85%, and the COD removal rate is between 36-97%. It shows that the vibrating membrane has good performance of preventing membrane fouling and concentration polarization. In this situation, only by strengthening the treatment of wastewater and focusing on the protection of water environment can we achieve sustainable development and promote the harmonious coexistence between man and nature.