bluuebunny/crossref_metadata_2025_split huggingface dataset:
High efficiency extraction technology and application of bedding directional long borehole along in Coal Roadway
Authors: Zhu Shikui , Xu Rui , Sun Dongling , Zhang Yongjiang , Cao Jianjun , Niu Xingang 
Published: May 2021

Abstract
In view of the occurrence conditions of coal seam groups in most mining areas in China, the protective layer mining mode is mainly adopted to carry out gas treatment in regional coal seam. In this paper, based on the pressure relief mining of the protective layer, the principle, type and geological conditions of the co-mining mode of the protective layer coal and gas under the condition of coal seam group are analyzed. In Taoyuan Coal Mine, there are some problems such as frequent handling, low efficiency, difficult to control the drilling track, poor drainage effect, etc. The directional long drilling hole is used instead of bottom drainage roadway to reduce the moving time of drilling rig. According to the coal seam characteristics of Taoyuan Coal Mine, the directional drilling rig and other equipment suitable for Taoyuan Coal Mine are selected, and the directional long drilling technology is studied, A total of 13 directional long boreholes have been constructed in the inner section of II 8223 machine roadway, with a total length of 2336m, a lower screen pipe of 2249m, a cumulative coal slag discharge of 480.17t, and an equivalent diameter of 442mm. By January 14, 2020, 78577m3 has been pumped by directional long boreholes, with an average pumping concentration of 15% ~ 100%, and an average net pumping volume of 0.05m3/min ~ 0.40m3/min. It saves the construction of floor drainage roadway, reduces the amount of drilling work for gas control, saves 6 million yuan of gas control investment in the inner section of II 8223 machine roadway, shortens the time for reaching the standard of drainage for 2 ~ 3 months, effectively alleviates the tension of mine production replacement, and realizes safe, economic and efficient mining.
Numerical simulation of gas-water two-phase seepage flow based on level set method
Authors: Zhai Shuo , Geng Shaoyang , Jing Min 
Published: May 2021

Abstract
The mechanism of gas-water two-phase percolation was previously characterized based on percolation experiments. However, the changes in the gas-water interface and the volume fraction of the two phases in the process of gas-water percolation in porous media cannot be accurately described by experiments. This paper uses core casting thin sections and AutoCAD software to establish a digital core. Based on the idea of level set, a two-dimensional gas-water seepage model in microscopic pores is established. The finite element numerical simulation software is used to solve the model to describe the gas. The changes of the water two-phase interface are visually displayed. At the same time, Darcy’s law is used to compare the relative permeability curve obtained from the gas-water two-phase seepage experiment with the relative permeability curve obtained from the gas-water two-phase seepage finite element simulation. The results show that the gas-water two-phase seepage experiment and the gas-water two-phase seepage finite element numerical simulation have basically the same characterization of the seepage ability of porous media. There is obvious fingering phenomenon in the process of gas flooding, and the gas preferentially passes through the large pore throat. The smaller the pore throat, the greater the velocity of gas passing through the pore throat. The gas-water two-phase interface change described by the numerical simulation of the gas-water two-phase flow based on the digital core is more reliable.
Study on Open-pit Mine Slope Stability Based on Improved TOPSIS Method
Authors: Sun Zhongqi , Li Jiangteng 
Published: May 2021

Abstract
In order to evaluate the slope instability risk of open-pit mine more accurately, this paper establishes a slope instability risk evaluation model based on Improved TOPSIS method according to the hierarchical holographic modeling method and entropy method. In this paper, the hierarchical holographic modeling method is used to establish the evaluation index system of open-pit slope stability, and 11 main indexes which have great influence on the stability are selected. The weights of 11 main indexes are calculated by using entropy method, and then applied to TOPSIS method. Finally, the positive and ideal solution distances of 5 typical open-pit slopes are calculated and the destabilization risk of 5 open-pit slopes is reasonably evaluated. The evaluation results were compared with those of other evaluation models to verify their rationality. The results show that the slope evaluation method based on improved TOPSIS can effectively evaluate the slope stability, which provides a new method for determining the high risk slope and effectively rating the slope risk.
Research of Reinforcement Deployment Mechanism of Automatic Sampler for Lunar Sample Return Mission
Authors: Liu Deyun , Zeng Ting , Wang Lusi , Mo Guidong , Li Jun , Sun Qichen , Gong Junshan 
Published: May 2021

Abstract
Chang’E-5 detector has successfully completed the lunar sample return mission, and accomplished the first extraterrestrial object drilling sampling detection of China. The deploying process is a key point for the whole mission and the design of the deployment mechanism is significantly important for the system. Compared to traditional deployment, low gravity surface operation and heavy load is the characteristics of this mission. In this paper, a design of reinforcement deployment mechanism suitable for lunar low gravity environment, large load condition is proposed. In this scheme, the planetary force augmentation and fulcrum separation method is adopted, the arm of force is introduced to achieve large load driving by small torque, and the design parameters are determined. The performance of the deployment mechanism is vindicated by dynamic simulation analysis and experimental verification. The research results demonstrate that the deployment mechanism can meet the demand of driving large load with small torque. The deployment mechanism designed based on this scheme has been employed by Chang’E-5 detector and performed perfectly on the moon.
Research on Application of Lattice Anchor System Design and Construction Monitoring in Slope Protection
Authors: Li Jianhua , Hu Da , Li Lianguo , Li Chungang 
Published: May 2021

Abstract
This article focuses on the application of lattice anchor system in high slope protection. According to the engineering geological characteristics of the slope of the site, combined with the requirements of the layout of the slope of the site, the slope is permanently supported by the combined support system of lattice anchor rods, nets, and soil spray. The example takes the slope under the arc failure mode as the research object to carry out the parameter design calculation, and conducts real-time monitoring during and after the construction. Calculation and monitoring analysis show that it is feasible for concrete lattice anchor system to be used in slope reinforcement projects, and the stable bearing capacity of lattice anchor system is higher, which has higher construction safety and better effect.
Study on the Characteristics of Underground Space in Wulong, Chongqing
Authors: Li Wei , Zhang Ruigang , Chen Fei , Zhou Dan , Liu Zhen 
Published: May 2021

Abstract
Comprehensive study of urban underground space status, efficiently configuring urban underground space resources to serve urban construction. This article selects the integrated analytical system of two levels of engineering geology, hydrological geology, environmental geology and human activities, and draws the weight value of the factor factor weight and the corresponding layer superimposed by one item by item. Sexual distribution. Choosing Chongqing Wulong is a research area, constructs 4 first-level indicators and 11 secondary indicators comprehensive evaluation system, and the factor weight value and adaptation map shows that Wulong Research Area should focus on environmental geological conditions, urban underground space division 3 A total of 12 pieces of zones, and the evaluation results can provide reference for the construction of Wulong city.
Identification of Interlayer Distribution of Marine Sandstone Based on Four-dimensional Well Test Technology
Authors: Li Ke , Li Yao , Zhang Peng , Wang Kai , Tang Chenyang , Tang Jing 
Published: May 2021

Abstract
Reservoir compartment is one of the important influence factors of fluid flow in the reservoir, and it is of great significance to carry out the research on reservoir compartment understanding and characterization for the research and development of residual oil distribution in the middle and late stages of an oil field. However, how the reservoir compartment is distributed, the current method is mainly throughout open heads, rock hearts, logging, and other information to explain, but this method is limited to blocks. Because of this problem, we use the four-dimensional test well method to calculate the distribution of the oil deposit formation coefficient based on the test well pressure data, and then use pressure denoising technology to make the data smoother, and the resulting two-pair curve plate is clearer, the layout can be used to explain the distribution of the compartments in the work area. This method requires only test pressure data and is suitable for multiple workspaces. This is of great guiding significance to the development of sea-phase sandstone inter-layer reservoirs.
Research on the Forecast Means of Large-Scale Multi-Branch Fracturing Capacity
Authors: Jiandong Liu 
Published: May 2021

Abstract
In order to effectively improve the economic benefits of large-scale fracturing of the single well in tight reservoirs, avoid investment risks and raise development effects, research on the forecast means of large-scale multi-branch fracturing capacity is carried out. Large-scale fracturing has high costs and high investment risks, it is necessary to conduct relatively accurate forecast for the capacity after fracturing to reduce investment risks. On the basis of the single-well capacity data of 78 large-scale fracturing wells that have been put into production in the Hailar Basin, the geological, development and engineering factors affecting capacity were deeply analyzed and summarized. According to different applicable conditions, the theoretical derivation and polynomial linear regression methods are used; two different capacity forecast models of tight reservoir are given. These two forecast models are used, the error of capacity forecast results after fracturing is less than 15%, and the accuracy can meet the actual application requirements of the mine, therefore, this forecast method provides a powerful technical support for the promotion of large-scale fracturing technology and reducing economic risks.
Effects of long-term sand mixing ameliorating measures on soil salinity characteristics of saline-alkali land in northern Shaanxi
Authors: He Lirong , Luo Yuhu 
Published: May 2021

Abstract
To explore different mix sand measures of saline-alkali land improvement effect for a long time, this study in northern shaanxi dingbian county saline-alkali soil as the research object, combined with field experiment and indoor test methods in the wild, analysis and improvement of saline-alkali soil salt and 1 ~ 6 years change characteristics of organic matter, reveal different mix sand thickness of heavy saline-alkali soil salt content and organic matter distribution. The results showed that the overall soil salt content in saline-alkali land did not change regularly with the change of sediment mixing amount or improvement years. There is no significant difference between different thickness (proportion) sand mixing measures on saline-alkali land improvement benefits. As time goes by, the soil salt content in the whole soil layer of saline-alkali land is not significantly changed by sand mixing treatment, but the soil salt content in arable layer is decreasing year by year, and the improvement benefit is significant in the short term. In conclusion, the long-term sand mixing improvement measures are beneficial to the improvement of the cultivated layer of saline-alkali land, thus reducing the salt damage suffered by crops in the process of growth and development, etc., the effects of sand mixing treatment on soil microorganisms and enzyme activities remain to be further explored.
Study on the relationship between well pattern and artificial fracture configuration in tight reservoir
Authors: Zhang Qingchao 
Published: May 2021

Abstract
In order to summarize the relationship between reasonably well pattern and artificial fracture in Fuyu reservoir which using the vertical well development, we determined the fracture network scale of overlay channel and a single channel sand body on the basis of the fracture network fracturing test and the downhole microseismic fracture monitoring data and annulus testing data. The reasonable fracture network sizes of different sand bodies were obtained by establishing a typical well fracture-matrix model and applying numerical simulation of the production of 16 different fracture networks in 5 years. Under the premise of established reasonable scale of the fracture network, it provides reference for the reasonably well pattern in the new area with similar reserves in geological conditions by the comparing of the 5-year oil production in 6 different well spacing.
Development status and trend analysis of anti-icing semisubmersible drilling platform
Authors: Yang Hu , Li Zhuo , Zhu Chenghua 
Published: May 2021

Abstract
In order to speed up the development of Arctic resources, it is the focus of polar drilling equipment research and development to develop a new anti-ice drilling platform which adapts to the harsh environment of polar regions and reduces the construction and operation costs. By briefly analyzing the structure of the existing antiice drilling platform, the design points of the anti-ice semi-submersible drilling platform are obtained, and the development status of the anti-ice semi-submersible drilling platform is analyzed. Finally, the development trend of the anti-ice semi-submersible drilling platform structure is summarized.
Research Progress on Vegetation Ecological Restoration of Abandoned Land in Coal Mine Area
Authors: Ye Shenglan 
Published: May 2021

Abstract
The large-scale mining of coal mines produces a large amount of abandoned idle land, which seriously damages the ecological environment and causes severe environmental pollution. Among them, waste coal gangue takes up a lot of land. A large number of abandoned land remediation and restoration in coal mining areas have also been carried out at home and abroad. Among them, vegetation ecological restoration has special advantages in the restoration of coal gangue abandoned land. Therefore, this paper analyzes the characteristics of coal gangue wasteland and the feasibility of plant growth, discusses the methods and application progress of vegetation restoration, and proposes prospects for the future research work on the restoration and utilization of wasteland in coal mining areas.
Research on the Impact of Income Gap on Environmental Pollution Based on Balanced Panel Data of 48 Countries
Authors: Luo Li , Ma Xiaoming 
Published: May 2021

Abstract
Reconciling economic development with ecological environmental protection has always been a hot issue of the whole society. However, existing studies only consider the impact of per capita income on environmental pollution, while ignoring the existence of income gap and its possible impact on environmental pollution. Therefore, the paper focuses on the specific analysis of the relationship between income gap and environmental pollution in 48 countries and revising the EKC theory. The empirical analysis results show that: there is an M-shaped relationship between the income gap and the per-capita carbon emissions, and the three turning points are 0.27, 0.36 and 0.52; there is an N-shaped relationship between the per-capita income and the per-capita carbon emissions, and the two turning points are 5218.65 and 13766.50 international dollars; the per-capita carbon emissions increases significantly as the per-capita energy consumption increases; and there is a significant negative relationship between the urbanization rate and the per-capita carbon emissions, which provide theoretical reference for the government to formulate corresponding policy measures.
Investigation, Evaluation and Countermeasures of Flood Disaster in Rural Grassroots in Plain Area
Authors: Guangming He , Hou Xiangdong , Liu Xiangjun , Wang Xunshi , Zhang You , Wang Weilin 
Published: May 2021

Abstract
In view of the complex causes of flood disasters at the grass-roots level in the plains and the difficulty of defense, this study proposes a point-to-surface flood disaster survey and evaluation method in the plains: First, the villages in the plains are divided into low-lying villages based on the causes of the disaster. And the villages affected by river floods; secondly, the two types of villages are used as the unit to investigate the basic situation of village flood disasters, starting from the three-level flood control and drainage system of the drainage system in the village, the main drainage canal outside the village, and the middle and small rivers to complete the investigation of the flood disaster; The calculation methods of the village’s critical rainfall index, critical rainfall index and river flood control capacity are put forward to quantitatively assess the village’s flood disaster risk and engineering flood control and drainage capacity; finally, corresponding countermeasures are proposed from the engineering and non-engineering perspectives based on the investigation situation, which is for plain areas. Flood disaster prevention work provides a reference.
Research on Lightweight Convolutional Neural Network in Garbage Classification
Authors: Yaqing Gu , Ge Bing 
Published: May 2021

Abstract
With the rapid development of society, more and more garbage consumables are produced. How to better recycle and use “garbage” has become a widespread concern. In this paper, a lightweight garbage classification model (GroupAtten_ MobileNet, GA_MobileNet) is designed based on the convolutional neural network ResNet-50. Reduce the amount of Params, FLOPs and memory consumption by using deep convolution and group convolution; use the channel attention mechanism to increase the accuracy of the model; Use the model fine-tuning method to further reduce the model’s Params, FLOPs, and memory consumption. This paper divides the recyclable garbage into 6 categories. Through an experimental comparison on the garbage data set, it is found that the amount of GA_MobileNet Params proposed in this paper is 280 times less than ResNet-50; the FLOPs amount is reduced by 31.7 times; the accuracy rate Increased by about 3.1%; operating time reduced by 50%;At the same time, compared with the same type of lightweight models Mobile Netv 2, Squeeze Net and shuffle Net V1 also has a clear advantage. Finally, it is concluded that GA_MobileNet is a garbage classification model suitable for lightweight convolutional neural networks, which is suitable for recycling of garbage, protecting the environment and benefiting the country and the people.
Research on the Diffusion of Harmful Gases from Ships Based on Gaussian Plume Model
Authors: Qin Cuihong , Zhang Wei , Wang Zheng 
Published: May 2021

Abstract
After a harmful gas diffusion accident occurs on ships, grasping the harmful gas diffusion behavior and possible impact range is the key to emergency rescue. In this paper, a Gaussian plume model is used to construct a simulation system for the diffusion of harmful gases from ships, and four comparative experiments are designed. The simulation is realized based on MATLAB platform programming. Under the conditions of different geographical locations, time periods and meteorological conditions when the accident occurs, the distribution of harmful gas diffusion concentration and the range of influence are analyzed. This work may provide a scientific basis for evacuation and emergency response plan formulation in the water area surrounding the accident.
An Empirical Analysis of the Impact of Environmental Decentralization on Environmental Governance in China
Authors: Pan Xiaoli , Ma Xiaoming 
Published: May 2021

Abstract
Environmental problems are particularly prominent in the context of carbon neutrality. The root cause of the environmental dilemma lies in the system. Therefore, this article discusses whether China is an environmental federalist country based on the perspective of environmental management system changes, and portrays China based on the two dimensions of environmental management system and fiscal decentralization. Changes in the system of environmental decentralization. With the help of environmental affairs responsibilities, the overall environmental decentralization is divided into administrative decentralization, monitoring decentralization, and supervision decentralization. The number of environmental protection agencies and the coverage of environmental protection agencies are used to calculate the Chinese-style environmental decentralization index during 1993-2015. The current environment in the western region Decentralization is still at a relatively low level. Through empirical analysis, the results show that the level of environmental governance is negatively correlated with environmental decentralization, which reflects the strengthening of the degree of centralization under the framework of environmental decentralization in China, such as the implementation of vertical management reform of environmental protection agencies, which will further improve local governments. Environmental governance level.
Research on global carbon emission flow and unequal environmental exchanges among regions
Authors: Guo Lixia , Ma Xiaoming 
Published: May 2021

Abstract
Global carbon emissions have become a huge problem, which greatly accelerates the process of global warming. However, the flow and exchange of carbon emissions caused by international trade has further increased the difficulty of determining carbon emissions responsibilities and advancing world’s emission reductions. Based on the multi-regional input-output (MRIO) model, this study analysed the flow and outsourcing of carbon emissions among six regions of the world in 2014, and applied the regional environmental inequality (REI) index to measure the unequal environmental exchanges among regions. We found that global carbon emissions reached nearly 35Gt, of which more than 20% were outsourced to other regions. Especially developed regions, such as EU 28, USA and Japan, had significantly higher consumption-based carbon emissions than production-based carbon emissions. The unequal environmental exchanges mainly occurred between developed regions and underdeveloped regions. This paper can help to distinguish emission responsibilities of various regions of the world, and contribute to world emission reduction policies.