bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic response study of buried pipe subjected to dynamic compaction
Authors: Du Jifang , Wu Shuaifeng , Zhang Yinqiu , Hou Sen 
Published: August 2019

Abstract
Monitoring the internal vibration of the soil under dynamic compaction is often influenced by the environment. If the sensor is located in the crushed rock soil, its monitoring data often do not have typical representativeness. Therefore, a monitoring method of sensors placed in pipe is proposed. Based on the experience of earthquake and blasting engineering, the feasibility of the measurement method is studied and the results showed that the sensors placed in PVC pipes can reflect the response of soil. Two field tests, low energy and high energy, were conducted to verify the conclusion. After comparison of various vibration characteristics including waveform, Fourier spectrum, and amplitude attenuations with distance, the velocity of the sensors in PVC pipe showed linear relationship with sensors in soil. It can be concluded that the sensors placed in PVC pipe can be used for the test of vibration in soil and represent the typical vibration of the whole stratum.
Evaluation model of two-stage gravel packing sand control well based on additional pressure drop
Authors: Qi Minhui , Li Mingzhong , Li Tong , Liang Jun , Liu Chunting , Ma Junjie 
Published: August 2019

Abstract
Two-stage gravel pack sand control technology solves the problem of silt sand blockage in traditional high-pressure gravel pack, effectively improves the effective period and flow conductivity of the gravel pack. This technique has been widely used in the development of unconsolidated sandstone reservoirs, but the related studies still remain insufficient. In this paper, a sand control evaluation model based on additional pressure of the gravel packed layer is proposed for two-stage gravel packing sand control wells. Firstly, the complex mechanisms of sand plugging in gravel pack is divided into two types, horizontal and vertical, and the calculation model of dynamic permeability of the gravel pack is established. The finite element model of two-stage gravel packing sand control wells based on fluid-solid coupling is established by multi-physical coupling software COMSOL. The additional pressure drop of the sand control wells under various construction parameters is evaluated. Applying this method to evaluate a two-stage gravel packing well in Shengli Oilfield, it is concluded that after 200 days of production, the gravel pack’s additional pressure drop of the traditional packing increases to 2.5 MPa, while the overall additional pressure difference of two-stage gravel packing is stable at about 1.3 MPa. It is proved that two-stage gravel packing sand control technology can effectively reduce the additional pressure drop and improve the productivity of oil well after completion.
Study on feeding system performance of CBM carrier mounted rig
Authors: Chang Jianghua , Zhang Yang , Fan Dong , Tian Hongliang 
Published: August 2019

Abstract
Feeding system is the main mechanism of carrier mounted rig, and determines the rig’s performance. The feeding system contains stretching mast, which pulls the drive head through two hydraulic cylinders and steel cables, as a result, the rig has a compact structure and long feeding distance. The feeding system’s hydraulic system including two pumps and two control circuits is designed to meet the demand of fast round trip and pressure’s accurate control of drilling based on the analysis of drilling procedure and load performance. The two explosionproof valves on the head end of feeding cylinders guarantee the stable suspend and avoid percussion drilling after pipelines bursting and drilling tools dropping on account of maloperation. Furthermore, the two explosionproof valves make the pressure of the two head ends of feeding cylinders equal to ensure the two feeding cylinders to run in step through control ports in parallel. In the end, ZMK5530TZJ100 is developed and applied to construct a “L” horizontal directional well with a depth of 1675 m to verify the rationality and reliability of the rig’s feeding system.
Study on Wiped Area Measurement Method Based on 3D Scanning
Authors: Liang Haojie , Jiao Zhiwei 
Published: August 2019

Abstract
The coverage rate of wiped area is a critical index for designing the windshield wiper system and driver forward field of view in particular. SAE Recommended Practice clearly define the minimum requirements for wiped area that must be met before a passenger car can be sold. The challenge is to develop measurement methods which transfer wiper pattern extracted from the windshield glazing surface to the data that can be calculated. In this paper, we apply hand-held laser scanners to produce the point clouds of wiper pattern, convert them into computer-aided design model, and then trim areas A, B, and C according to the edge feature of wiper pattern, finally calculate the percentages of areas A, B, and C that are wiped. Compared with traditional photography-based measurement method, the application result showed that scanning-based method possess better accuracy performance for wiped area test.
Research on Main Geological Controls and Enrichment Model of Coalbed Methane Distribution in China
Authors: Wang Kexin 
Published: August 2019

Abstract
The distribution and enrichment of coalbed methane in China are controlled by various geological factors. A systematic study has been carried out on six aspects: geological structure conditions, burial depth, hydrogeological conditions, sedimentary environment, physical properties and magmatic activities of coalbed methane. The results show that tectonic subsidence, hydraulic sealing and gas control, reverse faults and synclinal core are controlled by structural subsidence, hydraulic sealing and gas control. It is advantageous to CBM occurrence; tectonic uplifting, hydraulic migration and dissipation, normal faults, anticlinal core and subsidence pillars are disadvantageous to CBM occurrence; with the increase of coal seam burial depth, the adsorption capacity of CBM increases gradually, and decreases after the critical burial depth; the thicker the thickness of coal seam roof and floor, the more dense of the lithology, the more favorable to CBM preservation; the content of CBM is positively correlated with coal thickness. According to the influence degree of geological factors, the distribution and occurrence of coalbed methane can be summarized as two types: comprehensive control of multiple factors and main control of one or two factors.
The dividing and value technique on well logs for Lithology identification of pyroclastic rocks
Authors: Dai Linlin , Lin Lili 
Published: August 2019

Abstract
The ability of logging curves to reflect the rock interface is related to logging principles, which is often different from the layer interface determined by coring. According to basic principle of logging curve, analyze the corresponding relationship between comprehensive lithologic boundary determined by coring and the boundary determined by well logging curve. The identification method combining the two technique is given. In view of that the logging curves are insensitive to some thin layers and transition lithology, the reasonable value method are given as a result. Using this result can well judge the change trend of lithologic profile.
Comparison and Research of Fisheye Image Correction Algorithms in Coal Mine Survey
Authors: Xu Mengxue 
Published: August 2019

Abstract
Fisheye lenses are widely used in scene surveillance, robot navigation and engineering measurement due to their wide field of view and short focal length. However, the image taken by the fisheye lens has a large degree of distortion, so image correction is the key point of research. In this paper based on the distortion of fisheye image in coal mine underground video surveillance system, the latitude and longitude coordinate method, spherical perspective projection method and panoramic stitching method commonly used in fisheye correction are compared and given an improved algorithm. In the actual survey image correction, preprocessing is an important process, that is, to find the center and radius of the fisheye image. The advantages and disadvantages of the algorithm for finding a circle are also compared.
Mechanical model of safety thickness for resource recovery of complex & difficult mining ore body
Authors: Xie Chengyu , Lu Hao , Chao Lei , Feng Renwu , Shi Dongping , Zhang Xiaoqiang , Tao Zhijie , Liu Guojun , Wang Xinfeng 
Published: August 2019

Abstract
In view of the difficulty in calculating the safe thickness of complex and difficult-to-mine orebody in the process of resource recovery, based on the elastic-plastic theory and mechanics method, the mechanical models of the safe thickness of orebody recovery above the collapse area and that of orebody recovery at the side of the collapse area are constructed respectively. The results show that: 1. Using the fixed beam model to calculate the safety thickness, the additional load on the roof, the volume weight and span of the rock stratum, the width of the rock stratum and the water pressure are the important influencing factors. When the water pressure exists, the safety thickness can be reduced; 2. When the safety thickness is calculated by the elastic plate model with fixed support around, the safety thickness decreases with the increase of the tensile strength or shear strength of rock mass, and increases with the increase of the external load; 3. When the collapse area is located at the side of the ore body to be mined, the safety thickness decreases with the increase of the tensile or shear strength of rock mass, and with the increase of the external force. The load increases with the increase of load. The research can provide theoretical support for mining residual mineral resources.
Analysis on Geological Conditions of Chang 7 Shale Gas Accumulation in Longdong Area in Ordos Basin
Authors: Li Zhenhua , Gai Ke , Yu Lan , Zhang Suya , Sun Ning , Li Xiangyang 
Published: August 2019

Abstract
The geological conditions of Chang 7 shale gas accumulation in Longdong area are analyzed from sedimentology, petrology and organic geochemical characteristics in this paper. The study shows that Chang 7 shale in Longdong area is mainly deposited in deep lake and semi deep lake, with thickness ranging from 10 m to 40 m. The shale is mainly composed of quartz, feldspar, clay minerals and a small amount of carbonate and pyrite, and its brittleness is high. TOC ranges from 1.5% to 20.0%, with an average of 7.9%, and hydrocarbon generation potential (S1+S2) ranges from 0.67 mg/g to 33.53 mg/g, with an average of 15.81 mg/g. The main organic matter belongs to type I and II, Ro ranges from 0.7% to 1.2%. It can be concluded that Chang 7 shale in Longdong area possesses favourable conditions for shale gas accumulation.
Comprehensive lithology identification of the Qingcheng formation in LS1 well area
Authors: Fan Yuanxun , Li Hongyu 
Published: August 2019

Abstract
Igneous reservoir, as a deep dominant reservoir, will mostly get high production once developed, but this kind of reservoir has long been the key and difficult point of well logging evaluation due to its complex lithology, various reservoir forming control factors and strong heterogeneity. Lithology identification is the primary task of well logging evaluation of igneous reservoir. Guided by the idea of sequential separation, this paper adopts conventional logging crossplot method and TAS chart method to identify the lithology of igneous rocks successively, meanwhile, the characteristics of igneous rocks imaging logging are summarized. Through the above research, a set of systematic lithology identification criteria for Yingcheng formation igneous rocks has been established.
Consolidation and Pore Pressure Characteristics of Remolded Unsaturated Loess Under Isotropic Stress
Authors: Jia Yajun , Chen Cunli , Zhang Dengfei 
Published: August 2019

Abstract
Loess is a typical unsaturated soil. The unsaturated constitutive model of loess is an important research direction of loess engineering characteristics. In this paper, the constant load K0 consolidation tests of unsaturated undisturbed loess with different water content are carried out, and the effects of water content on secant modulus, stress-strain characteristics and lateral pressure coefficient are analyzed.
Changes in The High-Latitude Headwater Basin of The Nenjiang River Basin, Northeast China, 1970s-2000s
Authors: Dong Liqin , Gong Hede , Wu Lihua 
Published: August 2019

Abstract
The Nenjiang River Basin (NRB), an important wetland area in China, has experienced large-scale degradation of the wetland area and the evolution of land-use patterns over the last 50 years due to global warming, changes in precipitation patterns and anthropogenic activities, especially in the headwater basin of the NRB. In order to investigate these changes, temperature, precipitation, runoff, land-use/vegetation and wetland changes from 1970s-2000s were analyzed using the Mann-Kendall non-parametric test and Arcgis10.2 software. Our results show that a temperature increase was recorded in the headwater basin of the NRB, and precipitation showed an overall increasing trend which became more evident in the headwater basin. Runoff presented an increasing trend on the right side of the basin and a decreasing trend on the right side. The occupation of agricultural land on the wetland area and a decrease of forest and grassland areas did not result in a significant reduction in floodplain wetland area. These land-use changes, however, did have an impact on water supply shortages in the agricultural zone to the left side of the NRB.
Experimental Study on The Effect of Charge Structure of Blasting on Damage to Dirt Band in Thin Coal Seam
Authors: Pan Yangbo , Zheng Mingliang , Xing Zhenqiang 
Published: August 2019

Abstract
Based on the coalmines with thin coal seam containing hard dirt band in Shandong Province, aiming at the problem of difficult mining caused by hard dirt band in the process of thin coal seam mining, the damage to hard dirt band by blasting in different charge structures was studied. According to the propagation law of blasting stress wave in coal and dirt band in different charge structures, an experimental platform was set up, and the damage characteristics of dirt band by blasting stress wave under the action of ordinary charge blasting and shaped charge blasting were studied through similar simulated comparative tests. The results show that in the ordinary blasting, the cracks spread out disorderly along the radial direction of the blasting hole and the damage of the dirt band is not so good; however, in shaped charge blasting, the peak stress increases 1.32 times in the direction of energy accumulation, while decreases 22% in the direction of non-energy accumulation, making the explosive energy more concentrated in the dirt band and forming a long and wide directional main crack in the dirt band.
Vertical Pullout Behaviour of a Torpedo Anchor Vertically in Stiff-Over-Soft Cohesive Soil Bed
Authors: Wang Cheng , Zhang Minxi , Yu Guoliang 
Published: August 2019

Abstract
This paper reports the results from a large deformation finite element (LDFE) model to provide insights into the vertical pullout behaviors of torpedo anchors in stiff-over-soft soil beds. 10 sets of numerical data were obtained by varying the top layer thickness, soil shear strength of the stiff-over-soft soil bed, tip embedment depth ratio, and pullout speed. The tip embedment depth ratio of the torpedo anchor (the ratio of the embedment depth at anchor tip to the anchor shaft length) varied from 1.48 to 2.91. Soil flow characteristic was discovered by the finite element analysis. The observation of soil flow characteristics provided deep insight with the interaction between the torpedo anchor and its surrounding soil.
Study on The Genesis of The Chedu Gold Deposit in Bikou Block
Authors: Wang Dequan , Wang Jianguo , Deng Shengbo , Wang Yizhong 
Published: August 2019

Abstract
The Chedu gold deposite is located in the south rim of bikou terrane. It is the first BIF-type gold deposit in shaanxi province. Experiment with electronic probes and scanning electron microscopy, we first discovered silver gold mine and calaverite wrapped in single-grain magnetite.According to the results of hydrogen and oxygen isotope analysis of quartz in gold ore, the value of δ18O is from 16.4 ‰ to 16.6 ‰ and δD is from 16.4 ‰ to 16.6 ‰. This value is similar to the hydrogen and oxygen isotope values of quartz in BIF type iron ore. The discovery of wrapped gold and non-visible gold in magnetite suggests that gold is formed earlier or at the same time as the magnetite crystallizes. It is of great significance to study the genesis mechanism of BIF type gold deposit.
Research on repeated loading and sinkage characteristics of soil by numerical analysis
Authors: He Jian , Wu DaLin , Ma JisSheng , Wang Hongkai 
Published: August 2019

Abstract
The research on repeated loading and sinkage characteristics of soil can calculate the sinkage of wheel and track in driving process more precisely, so it can help calculate the vibration characteristics and driving resistance of vehicle more accurately. This paper analysis the soil repeated loading and sinkage characteristics based on finite element method. The results shows that the unloading and reloading process of soil can be assumed as a straight line with slope of k on load-sinkage curve, here k is called rebound coefficient. The research conclusion can provide reference to the vehicle terramachanics and other research involved soil deformation.
Sedimentary Succession and Model of Gravel Beach-Bars in The Southeastern Qinghai Lake
Authors: Peng Biao , Ye Shenglan 
Published: August 2019

Abstract
The modern is the key to the past. Based on the field investigation of the Qinghai Lake, the authors have carried out the elaborate dissection of profiles parallelly and vertically with the shoreline and the surface analysis of the forming beach-bars. The sedimentary successions of gravel beach-bars are summarized and the model of gravel beach-bars are established. The gravel beach-bars have a fixed sedimentary succession, the “ABC” sequence. A interval, the bottom of the sedimentary succession, is composed of coarse sands and gravels, which are sub-rounded, poorly-sorted, massive, and gravels oriented floating in the coarse sands; B interval, the middle of the sedimentary succession, is composed of gravels, which are sub-round, well-sorted, and massive bedding; C interval, the top of the sedimentary succession, is composed of coarse sands, which are well-sorted and normally graded bedding. In the actual gravel beach-bars, three intervals are often presented in a variety of combinations, such as “ABCABC”, “BCBCBC”, “ABABAB” and other combinations. The hydrodynamic conditions of gravel beach-bars can be divided into three zone, wave asymmetric zone, breaker zone and surfing zone. The three zones respectively correspond with the A interval, B interval, and C interval. These findings provide an important basis for the reconstruction of paleoenvironment and the identification and distribution prediction of beach-bars in the ancient continental lake basins.
Study on the Viscosities of MDEA-Amino Acid Ionic Liquid Aqueous Solutions
Authors: Li Mengying , Lu Chunjie , Zhang Pan 
Published: August 2019

Abstract
The viscosities of 1-butyl-3-methylimidazolium glycine ([Bmim][Gly])-N-methyldiethanolamine (MDEA), tetramethyl amine glycine ([N1111] [Gly])-MDEA and l-butyl-3-methyl-imidazolium lysine ([Bmim][Lys])-MDEA aqueous solutions were respectively measured by using the NDJ-5S digital rotational viscometer. The temperatures ranged from 303.2K to 323.2K. The mass fractions of MDEA and amino acid ionic liquids (AAILs) respectively ranged from 0.30 to 0.45 and 0.05 to 0.15. The Weiland equation was used to correlate and predict the viscosities of [Bmim][Gly]-MDEA, [N1111] [Gly]-MDEA and [Bmim][Lys]-MDEA aqueous solutions. The temperature and mass fraction dependences of the viscosity of MDEA-AAIL aqueous solutions were demonstrated on the basis of experiments and calculations.
Application of combined remediation in heavy metal polluted soil
Authors: Xu Yan , Lu Yangjie , Tian Chang , Yang Jianqiang 
Published: August 2019

Abstract
Whether it is single or compound heavy metal pollution, it is universal, complex, and invisible. The soil pollution cannot be completely resolved only relying on a single repair technology, requiring multiple approaches often. The combined remediation technologies of soil pollution can exert respective advantages, abandon their shortcomings, and optimize the repair effect. Based on a large number of literature surveys, this article discussed the application of combined remediation in heavy metal-contaminated soils, in order to provide reference for the rehabilitation of heavy metal-contaminated soils.
The preparation of a straw engineering sand-fixing plank and its sand-fixing and replanting performance exploration
Authors: Pu Hongqin , Gao Dekuan , Wang Haiwang , Wu Zhengjie , Li Yuanming , Wang Guanqi , Zhang Yukai , Ma Yuan , Wang Bingzhu , Qi Xiwei 
Published: August 2019

Abstract
To improve the shortcoming of sand fixation in traditional engineering, the study prepares a kind of porous composite for sand fixation and replanting by taking waste straw as the skeleton, polyvinyl alcohol and aquasorb as the composite agent, then pressing moulding by a press machine. Firstly, the effect of PVA on the mechanical properties is studied by sheering strength. In addition, the fracture mechanism of the composite is analysed by infrared spectrum of the PVA and photos under the optical microscope. Then, it is studied the influence of the amount of aquasorb on the water absorption and retention ability of the composite through the water absorption ratio and water content. Besides, the good water retention and replanting performance of aquasorb is visualized through the macro humidity contrast. The results show that, with the increase of PVA content, its sheering strength first decreases and then increases to the peak value, which is as high as 4.79MPa. It can be seen through the analysis of fracture morphology, that the composite crosslinking of PVA and aquasorb forms a three-dimensional network structure. And the structure enhances the toughness of the composite. With the increase of the content of the aquasorb, the water absorption ratio and the water content first increase and then decrease. When the content is 33.33%, the effect reaches to the optimal level, the water absorption ratio reaches to 3.76 and the repeated water absorption ratio reaches to 2.71. What’s more, the water content is always higher than other proportions. Therefore, the composite can effectively cooperate with plants and extend the years of sand control. The study provides a new idea and basis for the combination of sand fixation and waste straw.
Life cycle assessment on metal supply from environmental perspective
Authors: Liu Yongquan , Diao Shujuan , Chang Yan 
Published: August 2019

Abstract
Metal supply is very important for economic development and the environmental effect on metal supply has become a serious problem. The main challenge is to decide how to quantify the environmental effect. A series of researches have promoted different methods. This paper promotes an improved approach for assessment of environmental effect on metal supply. LCA method was used and system steps of the mining and processing during LCA method of a specific metal was first identified. The midpoint and endpoint data were derived separately for Al and Cu as case study. Then normalization was applied to the endpoint data and the section with biggest value was considered most serious environmental effect. And the endpoint value for this section is chosen as environmental implication for a specific metal. We hope this approach can be a convenient and practical method for the environmental effect assessment.