bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research and Application of Numerical Simulation of Hydraulic Fracturing in Low Permeability Fracture Reservoirs
Authors: Zhao Qiang 
Published: November 2019

Abstract
Based on FuYu formation of DaQing oil field, built the geology, 3D rock mechanics and 3D stress field models with core and logging data, and obtained the properties of any point between wellbores. With the fracturing principle, the actual geometry of the fractures can be calculated, and the asymmetry fractures model can be built, including the lengt’h, height, width and the direction of the fractures. With the analysis of production history, the residual oil distribution can be obtained, and the multiple fracturing procedure can be designed. With the guidance of the asymmetric fracture models, the daily increase of production is more than 4 ton.
Research and Exploration of Ecological Highway Carbon Sequestration Forest Methodology
Authors: Ying Haining , Wan Lijuan , Deng Shejun , Cheng Dongxiang , Jiang Yanming 
Published: November 2019

Abstract
Based on the demand of ecological highway construction, this paper explores the research work of carbon sequestration forest. The introduction of forest carbon sinks and advanced concepts of the forestry carbon sequestration, and for the measurement of the highway in the carbon sink forest carbon sink monitoring and exploration on the aspects, such as, the forest carbon sinks and forestry carbon sink theory knowledge, used in highway transportation, implements the carbon sink forest methodology used in the field of traffic, road area change ever green landscape, the shrub tree species as the main design concept, put forward the concept of carbon sequestration in the road system and based on the neutral roadside greening design forestry carbon sequestration. On the basis of energy conservation and emission reduction, the construction of carbon sequestration forest is adopted to solve the carbon emission problem of the transportation industry from another perspective, so as to improve the quality of planting trees along the transportation lines of Jiangsu province and even the whole country, update the greening concept, enhance carbon sequestration and ecological efficiency, and open up a new path for building a green transportation environment.
Reconstruction of rainfall fields using Microwave Links, Weather Radar, and Rain Gauge: First Results from the China Field Experiments
Authors: He Bensheng , Liu Xichuan , Xue Yang , Gao Taichang , Zhang Peng , Song Kun 
Published: November 2019

Abstract
Inversion of regional rainfall by the attenuation of microwave links has been confirmed a promising method for monitoring large areas of rainfall. To further explore precipitation information from microwave links data, a reconstruct method of rainfall field using microwave links, weather radar and rain gauges is presented in this letter. We utilize mean correction factor method to adjust the rainfall field from radar by microwave links and rain gauges; and validate it by a field experiment using two microwave links, a S-band radar, and 15 rain gauges. The results show that the rainfall field can be improved significantly by joint reconstruction of microwave links, weather radar and rain gauges, and the joint reconstruction in evenly distributed area is better than that in unevenly distributed area. This method supplements an effective approach to reduce the uncertainty of single instrument and improve the rainfall field by using multiple instruments.
Research progress on release of endogenous pollutants and remediation technologies in water sediments
Authors: Lu Fang , Xue Qiuhong 
Published: November 2019

Abstract
The problem of water pollution is becoming more and more serious, and the release of endogenous pollution in water sediments is an important aspect. The paper summarizes the chemical, environmental and hydrodynamic factors of common pollutants in sediments, and the effects of endogenous pollutants release, pollution control and treatment in the sediments, put forward some ideas about the development of research on endogenous pollutants in sediments. It is hoped to promote the in-depth development of prevention and treatment of endogenous pollutants in water sediments.
Analysis of migration and failure regular pattern of overlying strata in different mining heights
Authors: Liu Cong , Cheng Yong , Nie Qi , Shen Xuzhu , Liu Yuxin 
Published: November 2019

Abstract
In this paper, the H-mine is taken as the research background, and the critical layer theory is used to determine the reasonable height of the “three belts” of the overlying strata in different mining heights. This thesis uses FLAC3d numerical simulation to analyze the law of failure in roof movement under different mining height conditions. The research shows that the height of the fracture zone increases abruptly with the increase of the mining height due to the influence of the key layer. Each mutation indicates that a key layer is broken to form the masonry beam structure. In the numerical simulation, the plastic zone of the working face has a “saddle-shaped” distribution with high ends and low middle. With the increase of mining height, the differences between the plastic zone range above the mining boundary and the central plastic zone is reduced. From the bottom to the top, the roof is divided into several regions, that is, tensile failure region, the shear tension failure region, shear failure zones and undamaged areas. With the increase of mining height, the pre-stress concentration factor and the lateral stress concentration coefficient increase linearly, and the lateral stress concentration factor is slightly lower than the pre-stress concentration factor. The peak position increases as the height increases.
A model test study of three-dimensional deformation behavior of retaining structures of rowed piles
Authors: Wang Chenghua , Chen Hui , Li Kai 
Published: November 2019

Abstract
To improve the accuracy of methods for analyzing retaining structures, a model test study was conducted to simulate the process of excavation in sand. The displacements and moments of the rowed piles in corresponding excavation stages were measured and analyzed. The method for analyzing three dimensional behaviour of retaining structures based on additional earth pressure theory showed accuracy better that form the methods based on traditional three-dimensional elastic reaction method based on total earth pressure theories. The applicability and validity of the additional earth pressure theory was discussed and verified.
Study on Dynamic Heat Transfer Process of Waste Gas in Coke Oven Riser Coking Cycle
Authors: Huang Haiqing , Zou Shenghua 
Published: November 2019

Abstract
Waste heat recovery of waste gas in rising tube is a complex heat transfer process, and this paper analyses and studies the heat transfer problem of the coke hoist heat exchanger in 1 coking cycle by theoretical derivation and numerical calculation. Based on the thermal balance equation, the heat transfer differential equation of the gas flow of the rising tube is derived, the mathematical model of heat transfer for waste gas waste heat recovery is established, and the heat transfer and heat transfer coefficient of the coke oven rising tube heat exchanger in 1 coking cycle are obtained. In 1 coking cycle, the heat transfer of waste gas fluctuates in 1 coking cycle, and the heat transfer of waste gas in the rising tube is 19 to 26 kW, with an average heat transfer coefficient of 30 to 36 W/(m2·K). In the late coking, with the decrease of waste gas flow and the decrease of heat transfer, it will cause the temperature of the rising tube wall to change, and the gas flow should be maintained in the late stage of coking to prevent the phenomenon of sudden change of the inner wall temperature; In the actual production can be several coke ovens in parallel production, and the flow and temperature of waste gas timely monitoring, so that the flow of waste gas control at 800m3/h, improve the efficiency of waste gas waste heat recovery.
Process Optimization Experiment of Preparing Light Ceramsite from Qinghai Reshui Coal Gangue
Authors: Wang Bing , Cai Yimin , Li Yonggang , Chen Huiyuan , Si Hongyu , Guo Zupeng , Cui Xiaoqin , Bao Yinglian , Hui Chunnan 
Published: November 2019

Abstract
Qinghai has abundant coal resources, but the accumulation of coal gangue poses a certain threat to the fragile ecology of the area. In this paper, coal gangue light ceramsite was prepared by using coal gangue from Qinghai Reshui coal mine as raw material and sodium carbonate as auxiliary material. The optimized process conditions are as follows: the mass ratio coal of gangue and sodium carbonate = 50:1 (10% hydrochloric acid contamination); the drying temperature is 105±2°C; the drying time is 90min; preheating temperature is 450°C; the preheating time is 10 min; the calcination temperature is 950 °C; the roasting time is 15 min. The ceramsite prepared under this condition has a packing density of 423 kg/m3 and a bulk density of 889 kg/m3. The process does not use fly ash, and all the coal gangue raw materials were used without any residue, which can effectively reduce the environmental pressure brought by the accumulation of coal gangue, and has high industrial application value.
Emergency Disposal Measures for Power-off of Non-intrinsically Safe Electrical Equipment during Abnormal Gas Emission in Working Face
Authors: Zhang Jufeng , Xu Tai , Yang Fengfeng , Zheng Chao , Miao Zaiquan , Zhang Jianjiang 
Published: November 2019

Abstract
Abnormal gas emission is a common gas phenomenon in coal mining face of gas mine. In order to prevent gas accidents, on the one hand, gas extraction measures are adopted to reduce or avoid abnormal gas emission; on the other hand, when abnormal gas emission is unavoidable, in order to prevent abnormal gas emission from occurring gas explosion accident by electric spark, non-cost cutting is adopted. Emergency measures such as power supply for quality and safety electrical equipment are taken as the second line of defense. Aiming at the abnormal gas emission phenomenon in East 102 coal face of Weijiadi Coal Mine, in order to avoid the gas explosion accident during the abnormal gas gushing period, the emergency measures for gas abnormal emission were expounded from the aspects of gas electric blockade, power cut and evacuation.
Effects of Detonation Waves Asymmetric Collision
Authors: Fang Tao , Li Xiangyu 
Published: November 2019

Abstract
In this article, Effects of detonation waves asymmetric collision was studied. Through theoretical calculation, the position of detonation waves collision was shown. And it is found by numerical simulation that the pressure of detonation waves interaction decreases wave-likely following the initiation delay time increasing, but still exceed the pressure of the place where there is no interaction of detonation waves. The pressure-enhancing effects of detonation wave interaction can be used to achieve the energy accumulation.
Building edge extraction based on DSM digital surface model and LIDAR point cloud data
Authors: Kong Hui 
Published: November 2019

Abstract
LIDAR (Light Detect And Ranging) is a new measurement system that USES laser beam scanning to Detect targets And measure distances, And can directly And quickly obtain high-precision digital surface models (DSM) of different areas, such as urban areas. This can make up for the defect of image data in the third dimension. The emergence of this technology provides a new way for the rapid extraction of surface models, especially for buildings in urban areas. In this paper, based on the airborne LIDAR point cloud data, the irregular discrete LIDAR point cloud data grid resampling rules, get digital surface model (DSM), and then carried out in accordance with the elevation gray quantitative generated DSM depth image, using edge detection operator to extract buildings, using orthogonal constraint to the adjacent segment Angle adjustment, to obtain the edge information in line with the actual situation of buildings. Finally, the accuracy and precision of segmentation results are analysed.
A Test Device System for Cracking Mud Shale under Hydraulic Fracturing
Authors: Hu Jiangchun , Lu Jiahao , Yang Chenglin , Li Pengfei 
Published: November 2019

Abstract
The exploitation of shale gas has always been a major problem, and the solution to this problem must start with the study of its nature. A kind of simulation device and monitoring method of mud shale cracking was designed and assembled by ourselves. First of all, made with two layers of the general principle and four layers of 60 ° prefabricated crack two groups of similar material sample of the shale, then in turn for each block of multistage hydraulic fracturing test, and the use of strain gauge for strain monitoring. Results show that under the condition of no native prefabricated crack, hydraulic direction tend to toward weak bedding plane direction of crack extension until she reached the weak bedding surface, and then the main cracks along the weak bedding surface directly, at the same time there are prefabricated crack in native and weak stratification plane, in stage and the area between the prefabricated crack priority area map cracking formation, the results for the exploitation of shale gas has important guiding significance.
Study on the Monitoring of Karst Plateau Vegetation with UAV Aerial Photographs and Remote Sensing Images
Authors: Zhang Wen , Wang Zhiwei , Wu Hongzhi , Song Xuelian , Ruan Xirui , Wang Qian , Wen Kejian , Meng Junjiang , Li Fuxiang , Liao Jiaofa 
Published: November 2019

Abstract
Southwest China is considered to be one of the three major karst regions in the world. Fractional vegetation cover (FVC) can be an important factor in delineating the various steps in the karst regional evolutionary process that is expected to results in rocky desertification. Remote sensing using unmanned aerial vehicles (UAVs) is a new method of investigating, extracting, and monitoring vegetation. In this method, error correction of the results of five other classification methods that involve imaging using visible-light bands (EXcess Green, Normalized Green-Red Difference Index, Normalized Green-Blue Difference Index, Red-Green Ratio Index and Visible-band Difference Vegetation Index)), it was found that the classification accuracy for nonvegetation areas is improved after combining the normalized difference vegetation indices of the remote sensing images.
Discussion on the Construction of Ecological Restoration Model of Shichuan River
Authors: Wang Jing , Gao Shiqian , Peng Biao , Wei Yulu 
Published: November 2019

Abstract
This paper took Shichuan River in Fuping County of Shaanxi Province as the research object, discussed the targeted ecological restoration model that integrated water quantity, water quality, landform and biological community. The restoration model has made a positive contribution to accelerating the development of the southern new district of Fuping County, coordinating the harmonious development of urban and rural areas, and provided scientific and technological support for similar renovation projects in other river basins.
Study on the Change Characteristics of Soil Salinity in Heavy Salinized Area of Xinjiang
Authors: Hua Dongwen , Li Juan , Li Jinbin 
Published: November 2019

Abstract
In view of the problems of soil salinity, barren and other obstacles in the process of reclamation and utilization of heavy salinized land in Xinjiang, the heavy salinization area was selected as the research object, and the spatial variability of different salinity ions and its correlation were studied by using geostatistics and ground-penetrating radar technology. The results showed that the largest anion content in the soil of each layer of the study area was Cl-, followed by CO3
2-, the largest cationic content is Na+, followed by Ca2+, Cl- and Na+ The variation law is basically the same, and the salt ion content of the whole section has - the variability of intensity; the soil salinity in the study area showed "micro S" in the vertical direction. The characteristics of the table polymerization is not obvious, mainly related to artificial tillage; through spatial interpolation analysis, it is found that the salinity of soil in the study area has obvious characteristics of banded spatial distribution, the salinity of soil gradually increases from the southwest to the northwest, and the type of salinization is mainly chloride type. Detected by radar, in the study area deep in the 30cm, there is a dense salt plate layer in the soil, and the correlation analysis shows that the salt plate material is mainly CaCO3. This study provides a theoretical basis and reference for the zoning, improvement, management and rational utilization of salt in the heavy salinized region of Xinjiang.
Load Effect and Sensitivity Analysis of Tunnels in Landslide Area Method
Authors: Zhang Jiansheng , Zhang Fengting , Wang Yiting 
Published: November 2019

Abstract
In this paper, the mechanical model of tunnel in landslide area is established, the boundary and load conditions are determined, the internal force distribution of tunnel under landslide load is analyzed, and the influence of the scope of landslide area, load characteristics and stiffness of support structure on the internal force of tunnel structure is analyzed by using finite element software, and the sensitivity of each influencing factor is divided. Analysis. It is proposed that the support of tunnel in landslide area should be combined with increasing the thickness of secondary lining and the length of bolt, and verified by finite element method. By comparing the internal force of reinforced lining with that of unreinforced lining, it is concluded that the new support method is feasible.
Research Progress and Experimental Discussion on Feldspathic Sandstone and Sand Mechanical Properties
Authors: Li Jinbin , Wei Yulu , Li Juan 
Published: November 2019

Abstract
This paper mainly introduces the mechanical properties of feldspathic sandstone and compound soil of feldspathic sandstone and sand, analyzed the research status at home and abroad as well as the future development direction. It also discusses how to carry out relevant research in the future, including test plan design, test piece preparation, and experimental principles, etc. All are introduced in depth.
Study on the Improvement Effect of Desulfurization Gypsum in Saline-alkali Land
Authors: Pang Zhe , Wang Qilong 
Published: November 2019

Abstract
As the waste of coal-fired power plant, desulphurization gypsum is mainly composed of CaSO3 and CaSO4, which can replace Na+ in saline-alkali soil to improve saline-alkali soil. In order to study the effect of different dosage of desulfurization gypsum on the improvement of saline-alkali land, field experiments were carried out in Duiziliang Town, Dingbian County, northern Shaanxi Province, using drought-tolerant and Saline-Alkali-Tolerant local crop Mint as the test crop. The results showed that the application of desulfurization gypsum could reduce the harm of salt and alkali in soil to the germination, emergence and growth of millet seeds. Compared with the application of desulfurization gypsum, the soil pH value of plough layer (0-30cm) decreased by 4.2%-9.0%, and the total water soluble salt decreased by 6.6%∼33.0%. In addition, the application of desulfurization can promote the growth of mint in saline-alkali soil. Compared with the application of desulfurization gypsum, the dry biomass of the above-ground part of mint increased by 28.9%∼48.9%, the plant height increased by 24∼30 cm, and the yield per mu increased by 36.91∼65.28 kg. The results showed that the application of 20 t hm-2 desulphurization gypsum could improve the physical and chemical properties of saline-alkali soil in northern Shaanxi and obtain higher yield for moderate and severe saline-alkali land. It was suggested that the application of desulphurization gypsum should be popularized in saline-alkali land in northern Shaanxi.
Alteration Hydrothermal Stage Division and its Application in Geological Prospecting Using CASI-SASI Airborne Hyperspectral Data: Taken the Baixianishan Area in Liuyuan Town of Gansu Province as an Example
Authors: Sun Yu , Zhao Yingjun , Qin Kai , Tian Feng , Pei Chengkai 
Published: November 2019

Abstract
The division of the hydrothermal period based on alteration minerals extracted from airborne hyperspectral data has been rarely researched. This work processed CASI-SASI airborne hyperspectral data, and optimized reference spectra from image endmembers based on the expert knowledge in the Baixianishan area. The mixed tuned matched filtering method was utilized to map alteration minerals, and the distribution of limonite, short-wavelength sericite, middle-wavelength sericite and long-wavelength sericite was obtained. Distribution patterns of limonite and three sericite subclasses were analyzed, and three hydrothermal stages were divided. It is considered that the second hydrothermal activity is closely related to the gold deposit. It is proposed that prospecting factors of the Baixianishan gold deposit are NEE-trending fault structure, the vein-like distribution of limonite and short-wavelength sericite. Based on the discuss above, a favorable prospecting section is found in the south of the Xiaobaishan area. It is indicated that the CASI-SASI airborne hyperspectral data can quickly and accurately provide more effective remote sensing criteria at the regional scale for both basic geological survey and mineral resources exploration, which has a wide application prospect in the geological field.
Water Circulation of Geothermal System in Kaifeng Depression
Authors: Duan Zhongfeng , Zhao Jiangtao , Li Fulai , Kong Yanlong 
Published: November 2019

Abstract
Kaifeng is rich in geothermal resources. It is important to clarify its genetic model for its further sustainable utilization. In this paper, the geothermal geological conditions of Kaifeng Depression are analyzed, the circulation of geothermal water in Kaifeng area are discussed by using hydrochemical and isotopic data, and the conceptual model of geothermal system is preliminarily established.
Numerical Simulation Study on the Movement Characteristics of Dust Flow in Mine Working Face
Authors: Lu Guangli , Hu Hao , Xing Feibiao 
Published: November 2019

Abstract
Based on the computational fluid dynamics and mine ventilation theory, the geometrical model of the fully mechanized excavation face under the conditions of long-short and short-pump ventilation system was established with the comprehensive mining face of the 905 transportation lane in Shanxi Coal Group. The FLUENT software is used to simulate the distribution characteristics and variation of the wind flow field and dust field in the three-dimensional space of the fully mechanized excavation working face at different air supply speeds, and the simulation results are verified by field test. According to the numerical simulation study and the on-site measurement results, the optimal position of the dust migration law of the fully mechanized excavation face under the long-short and short-drain ventilation mode is determined, and the rationalization suggestions for the mine dust control are put forward.