bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation Research of BD Satellite Navigation Based on MATLAB
Authors: Chang Tong 
Published: April 2020

Abstract
This paper studies and analyzes the key technical principles of BD2 satellite orbit modeling. It uses MATLAB to design and simulate the satellite constellation and satellite positioning principle of Beidou. It can display the selected orbit and the satellite used for user positioning. It realizes the simple carrier motion modeling and studies the ionospheric delay correction model. Through the testing and analysis of the key technologies of the system, it shows that the system can realize the navigation and positioning function, which has practical value.
Geodetic Line Interpolation Algorithm with Absolute Precision Threshold Constraints
Authors: Dong Jian , Li Binbin , Peng Rencan , Chen Yang 
Published: April 2020

Abstract
The existing geodetic line interpolation algorithm mainly has the following problems: first, the map projection property and the limitation of the scale size can not be separated from the chart carrier; the second is that the maximum interpolation interval needs to be given artificially, and the third is that the precision of the algorithm results can not be adjusted adaptively. Aimed at the above problems, in this paper, in this paper, the length of the earth spherop corresponding to the replacement of the geodetic line by the space linear line is calculated according to the curvature of the earth, and it was taken as the maximum interpolation interval so that a geodetic interpolation algorithm with absolute precision threshold constraint was proposed in this paper, too. The correctness of the algorithm and the precision of the results are verified experimentally by using the classical example, and the results show that the algorithm can not only adjust the maximum interpolation interval adaptively according to the absolute precision threshold, but also improve the absolute precision of the results, and also has wide applicability to the distance of geodetic line.
The retrieval of atmosphereric water vapor based on Beidou Ultra-rapid precise ephemeris using different mapping functions
Authors: Guo Qiuying , Hou Jianhui , Wu Xuxiang 
Published: April 2020

Abstract
The atmospheric mapping function is an important model to convert the total tropospheric delay on the slant path of satellite signal into the zenith tropospheric delay. It is important to choose the appropriate mapping function to improve the accuracy of water vapor estimation. Beidou observation data in different seasons from 6 MGEX stations were processed using GAMIT 10.7 software. Three mapping functions (NMF/GMF/VMF1) were used in the estimating the atmospheric precipitable water vapor (PWV) based on Beidou Ultra-rapid precise ephemeris. The results of PWV/BDS were compared with the PWV/GPS. The experiments showed that the average bias between PWV/BDS and PWV/GPS is about 1-5mm. The GMF mapping function is slightly better than NMF and VMF1 in the retrieval of atmosphereric water vapor.
Three Dimensional Information Sharing Platform of Power Transmission and Transformation Based on Grid Information Model (GIM)
Authors: Lin Shaoyuan , Zhong Tianrong , Yu Xinmin , Luo Weichao , Lv Jinglei 
Published: April 2020

Abstract
Grid information model (GIM) is a technical standard formulated by State Grid Corporation of China to meet the needs of three-dimensional design of power transmission and transformation projects [1]. According to the characteristics of GIM data, this paper studies the design of distributed computing technology and service architecture to realize the online analysis and optimization of GIM data, so as to improve the efficiency and performance of GIM data analysis. Based on WEBGL technology, with the help of 3D tiles’ LOD ability and the openness of format, a 3D information sharing platform for power transmission and transformation is built to realize the efficient and smooth loading, display and sharing of GIM 3D data on the web.
Study on the selection and optimization of key elements in the offshore wave prediction
Authors: li Dongzi 
Published: April 2020

Abstract
The accuracy of inshore wave prediction is closely related to the key elements selected in the prediction. There is a problem of selecting and sorting the key information needed in wave forecasting. This paper combines AHP with DEA to build a new evaluation model of selecting scheme. By calculating the relative weight of the key information in each selecting scheme and calculating the relative efficiency value of the model, the importance sorting of the elements needed in wave forecasting is obtained, and the specific selection scheme is verified by an example Application. The established AHP-EDA model has the value of trial and extension in supporting the key element selection process of wave prediction.
A new remote sensing image fusion method combining principal component analysis and curvelet transform
Authors: Chen Chao , He Xinyue , Chu Yanli , Zhao Xin 
Published: April 2020

Abstract
In the framework of multi-scale decomposition, a new multi-source image fusion algorithm based on principal component analysis (PCA) and curvelet transform is proposed for pixel-level image fusion. Firstly the low-resolution multi-spectral image is transformed by PCA and principal components are obtained. Secondly the high-resolution image and the first three principal components of the multi-spectral image are respectively merged with curvelet transform and finally the fused image is obtained by inverse PCA transform. This method gives the results of fusion and is compared with the traditional method of PCA, which proves the effectiveness of the method.
Metallogeny of the Maoping graphite deposit,Sichuan Province
Authors: Wan Pingyi , Peng Zhaoqiang , Wang Guanghong , Zhou Yong , Yang Yongqiang 
Published: April 2020

Abstract
There are abundant crystalline graphite resources in Panzhihua area. Large and medium-sized deposits are mainly distributed in Renhe District and Miyi County of Panzhihua City, and their genetic types are sedimentary and metamorphic. The ore-bearing rocks of graphite deposits in Renhe area are mica quartz schist of Lengzhuguan Formation of Kangding Group of Early Proterozoic, while the ore-bearing rocks of graphite deposits in Miyi County are sericite phyllite of the first member of Tianbaoshan Formation of Huili Group of Mesoproterozoic, with a slightly later stratigraphic age and a slightly lower metamorphic degree. Therefore, a thorough study of the genesis and metallogenic regularity of graphite deposits in Miyi area is of great guiding significance to the search for similar types of graphite deposits in Panxi area.
Discussion on Road Reflection Crack and Control
Authors: Zhao Huifang , Li Hongbo 
Published: April 2020

Abstract
This paper focused on the problems encountered in the road construction of a coal-fired power plant in the Philippines as an example. Some cracks and damage appeared in the roadbed after the road concrete base layer has been built. If the concrete wearing course layer is poured on the old roadbed without dealing with the crack problem, some reflection crack will occur. This paper conducted a series of explorations on how to control the influence of reflection crack on concrete road wearing course layer and provides a variety of solutions to control the occurrence of reflection crack. The paper is expected to provide solutions to control reflection crack on concrete road.
Research on Water Inrush Disaster Control Technology in Double Shield TBM Excavation Process
Authors: Jiao Zhang , Shiqun Liu , Jianwei Zhang , Yan-xu Guo , Xin Chen 
Published: April 2020

Abstract
Taking the TBM water inrush accident in An-Xue section of Qingdao Metro Line 1 as the engineering background, the research is carried out from two aspects of TBM water inrush emergency measures and grouting reinforcement treatment technology, which can ensure the strength of stratum reinforcement and water shutoff, and at the same time prevent the slurry from damaging the cutter head. For different areas, the grouting construction technology is proposed. After the reinforcement, the water stopping effect is obvious, the water inrush point has no water flow out, the hole drilling effect is good, the core removal rate is 75%∼85%, and the strength meets TBM excavation requirements.
Reliability Analysis of Arch Dam Based on Optimized Complex Method: a Case Study of Shapai Arch Dam
Authors: Sun Tao , Chen Yuan , Wang Senhao , Yang Baoquan 
Published: April 2020

Abstract
The research on crack development and reliability index is very important for roller compacted concrete (RCC) arch dam. There are many methods for studying reliability of a structure, such as JC method or finite element method. But it is inevitable to take derivatives of complex functions in this method. However, the complex method can avoid this problem. Therefore, the optimized complex method is applied to the study of the distribution law of the reliability index of Shapai high RCC arch dam. And the possibility of dam cracking and failure are further analysed based on the calculate results. The research results provide the basis for the safety of Shapai arch dam and also provide reference for other similar arch dams.
Design and Study of Intensive Track Laying System for Single Hole and Double Road in Open Cut Station
Authors: Li Ningning , Zhang Chunyu , Liu Shiqun , Xie Chao , Li Chao 
Published: April 2020

Abstract
This paper takes Qingdao subway station as an example, considers reducing the cycle of track laying on the whole line, and adds rails and wells under the existing envelope structure. The single-track row of wells and a double-line entrance to the crossing are proposed. The analytical calculations and numerical simulation methods were used to check the mechanical condition of the station envelope and the main structure of the station under the rails. The research results show that the track laying base can be laid out in the enclosed open excavation station, and a series of problems such as land occupation coordination have been solved, and the period benefit is significant. This scheme can ensure the structural safety before the entrance of the rail row well is closed, and the position of the rail side frame below the middle plate of the station satisfies the requirements of the laying limit. This method has a novel design idea, has high application and promotion value, and provides a good reference for the design and construction of open-cut subway stations.
Study on application of gypsum-based self-leveling mortar in floor heating backfill
Authors: Zhang Jixiu , Zhang Ye , Liu Jikang , Miao Yuanchao , Duan Saihong 
Published: April 2020

Abstract
In this paper, gypsum-based self-leveling mortar is prepared by using desulfurization gypsum-based α-high strength gypsum as the main cementing material, and it is applied to the floor heating backfill. Comparing with cement-based self-leveling mortar, the thermal conductivity coefficient, thermal expansion coefficient, elastic modulus and other performance indexes of gypsum-based self-leveling mortar are studied. The results show that the gypsum- based self-leveling mortar prepared based on α-high strength gypsum has high strength and heat conduction. Good physical performance, good volume stability, low thermal expansion rate are suitable for floor heating. The application of the gypsum-based self-leveling mortar in the floor heating project shows that the gypsum-based self-leveling mortar can simplify the construction process and shorten construction time.
Effect of cement particle size distribution on properties of cement mixed with polycarboxylate superplasticizer
Authors: Lai Guangxing , Fang Yunhui , Chen Zhanghua , Shao Youzhe , Guo Yuanqiang 
Published: April 2020

Abstract
The particle size distribution of cement under different milling time was studied, and the effects of different particle size distributions on the polycarboxylate superplasticizer dosage of the paste and the bleeding property of the paste were researched, and the early hydration exothermic rule of cement was investigated with the hydration heat meter. The results show that with the increase of ball milling time, the particle size distribution of cement is close to the direction of small particle size. With the same paste fluidity, the dosage of polycarboxylate superplasticizer increased and the bleeding rate of cement paste decreased with the increase of cement fine particle components. Under the same condition, with the increase of cement fine particle content, the hydration reaction speed is accelerated and the degree of hydration is relatively high.
Study on the application of laser particle analysis in the test of geotechnical particle analysis
Authors: Xuekui Wang 
Published: April 2020

Abstract
In recent years, laser particle analysis method is a new method in geotechnical particle analysis. In this paper, through the particle analysis test of typical soft soil, the differences and control parameters between it and densimeter method are compared. The main conclusions are as follows: (1) the light shading percentage should be controlled between 5% and 20%;the concentration of dispersant (sodium hexametaphosphate) should be 0.04%;the circulating speed of centrifugal pump should be controlled between 1200-2000 RPM. (2) Compared with densitometer, the content of colloidal particles (< 0.002mm) and sand particles (> 0.075mm) measured by analysis method is different, and the content of clay particles (< 0.005mm), silt particles (0.005-0.075mm) and D50 is basically the same.
Study on self-healing performance of basalt fiber asphalt concrete in road environment
Authors: Yan Jingchen , Li Hanxiang , Shen Li 
Published: April 2020

Abstract
Load crack is one of the main failure forms of asphalt concrete pavement. Basalt fiber has become an important research direction of road fiber modifier. However, the self-healing performance research of basalt fiber asphalt mixture under different road environment factors are rarely. In this paper, the self-healing performance of asphalt pavement in different road environments is studied by combining the self-healing properties of asphalt and the crack resistance of fiber materials. The self-healing test of basalt fiber asphalt concrete was carried out after long and short aging, ultraviolet aging, snow melting and freeze-thaw cycles treatment. By using the damage rate as the evaluation index, the self-healing characteristics of basalt asphalt pavement were analyzed by the method of “fatigue-self-healing - fatigue” under the influence of different road environment. The experiment also compared the self-healing properties with SBS modified asphalt and matrix asphalt and explained the mechanism of basalt fiber mixture self - healing by electron microscope. The results show that the addition of basalt fiber can greatly improve the self-healing level of asphalt concrete under various road conditions.
Monotonic triaxial shear strength and cyclic triaxial properties of undisturbed soft soil
Authors: Li J S 
Published: April 2020

Abstract
The static and dynamic characteristics of Tianjin coastal soft soil are researched by cyclic triaxial test. For triaxial shear test, the specimens are isotopically consolidated under initial pressures of 100 kPa, 200 kPa, 300 kPa and 400 kPa, respectively; for the dynamic triaxial test, the specimens are consolidated under initial isotropic consolidation pressures of 100, 200, 300 kPa, respectively. The applied dynamic displacements are graded for each specimen, and the pore-water pressure is completely dissipated before application of next displacement amplitude. These tests show that the effective cohesion is 6 kPa and the effective internal friction angle is 26.5 degrees under consolidated undrained condition. The maximum shear modulus of soil is related to effective confining pressure, and its relationship with effective confining pressure can be expressed by Janbu’s formula. The shear modulus of soil is related to shear strain and decreases with the increase of shear strain. Hardin-Drnevich can be used to normalize the shear modulus.
Improvement of Defects in ZYFM type oil-water separator
Authors: Li Jun , Zhu Yuhua 
Published: April 2020

Abstract
the working principle and automatic control principle of ZYFM type oil-water separator are analyzed. It is found that the design of this type of oil-water separator is defective, which is easy to cause the crew to intentionally discharge excessive oily water. By improving the control circuit and changing the open three-way valve of the gas installation, the design defects are eliminated, and the phenomenon of the crew’s malicious discharge of excessive oily water is eliminated.
Reinforcement scheme design for geotechnical slope engineering
Authors: Wang Weiguang , Li Wan , Su Lihai , Zhang Ao , Chen Longfei 
Published: April 2020

Abstract
With the continuous development of western mountainous areas and the deepening of infrastructure construction, geotechnical slope has become an engineering problem that cannot be ignored in the process of construction and using. Due to its universality and great harm of accidents, it has become a hot spot that engineers and researchers pay more attention to. It is of great significance to strengthen the stability of geotechnical slope.There are mature theories at home and abroad, but the actual engineering geological conditions are complex, the combination of theory and practice still needs to be explored. Combined with the slope engineering of an airport in the loess plateau area, the engineering geological conditions and the current situation of the slope were firstly introduced in this paper, then the stability checking was carried out under natural working condition and heavy rain condition respectively. The slope reinforcement was carried out for Scarp 1 and Scarp 2, respectively. This paper is of great help to further understand the principle of slope engineering reinforcement and can provide experience for slope reinforcement under similar working conditions.
Study on Constitutive Relations of Unsaturated Sand
Authors: Zhang Weihua , Zhao Chenggang , Gao Yanhua 
Published: April 2020

Abstract
The development of a coupled hydraulic-mechanical bounding-surface constitutive model for unsaturated sand based on phase transformation state. The key point of the model is the state parameter which is introduced based on the phase transformation state considering the fabric change effects, and with the Soil-Water Characteristic Curve and taking into account of the hydraulic-mechanical coupling effects, a bounding-surface model is established. The model has smooth transition between unsaturated state, saturated state and dry state. The model parameters are easily calibrated via common triaxial tests and some other simple tests.
Experimental Research on the particle composition of flowing mud in Shenzhen Port
Authors: Zheng Airong 
Published: April 2020

Abstract
Based on the particle analysis, mineral composition analysis and chemical composition analysis of the flowing mud in Shenzhen port, it is found that the flowing mud in Shenzhen port has fine particles, a lot of colloidal particles, and an obvious increase of colloidal particles after salt washing. The clay mineral content is large, and the highest content is I/M mixed layer, which makes the flowing mud have higher plasticity, greater compressibility and lower permeability. The content of Cl− and Na+ +K+ in the mud of Shenzhen port is high, which belongs to Cl− -Na+ type, which has strong corrosiveness to steel and medium corrosiveness to concrete .
Experimental study on improving red clay with sand at the foot of mountain
Authors: Fu Jianbao , Lang Zhaobin , Zhang Jiaying 
Published: April 2020

Abstract
There is a large amount of red clay along a highway under construction in Southwest China. The red clay has high plasticity and small CBR which don’t meet the specification. This paper studied on red clay improvement by adding sand at foot of mountain. Research results show that the dry density of the improved red clay increases with the increase of the sand when the moisture content is the same. The optimum moisture content of improved red clay decreases with the increase of the sand. The maximum dry density increases with the increase of the sand. Liquid limit and plasticity index decrease after adding the sand. The CBR increases after adding the sand. The sand mixing ratio 4:6 was recommended to use in actual construction. And properties of improved red clay filler with the recommended ratio in actual construction meet the specification. Project implementation effect is very good.
Experimental study on compressive properties of round steel tube recycled concrete columns
Authors: Ye Jianfeng , Luo Caisong , Chen Huayan 
Published: April 2020

Abstract
In order to study the compressive performance of circular steel tube recycled concrete columns, four circular steel tube recycled concrete columns are designed and manufactured, and subjected to a monotonic static compression test. Consider the eccentricity and the slenderness ratio, this paper observes the whole process of the specimen and the failure mode, and analyses the ultimate bearing capacity, deformation curve, load-deformation relationship, and load-strain relationship. The experimental research shows that the failure process and failure mode of the round steel tube recycled concrete column are similar to those of the ordinary round steel tube concrete column. Similarly, the bearing capacity of the test piece decreases with the increase of the slenderness ratio and eccentricity, and the ultimate failure form is mainly the overall instability failure.
Geomorphological indicators of karst environmental disturbance in the mountainous region of Jinan City, North China
Authors: Guo Jiamei , Jia Rong , Qi Shanzhong 
Published: April 2020

Abstract
As one of cities located in the karst region of North China, Jinan City is a karst region that is heavily urbanized in recent years, but no study has been undertaken to monitor the disturbance of karst environment. To effectively address the threats and the disturbance to karst region in the city, this study proposes hierarchal and standardized environmental disturbance indicators as a tool to monitor regional impacts and strengthen more protection of the karst mountainous areas in North China. The geomorphological indicators of karst disturbance in Jinan City of North China include quarrying or mining, and flooding and storm- water drainage (human-built surface structure indirect effect).
Formation Lithology Identification Technology along Railway in Complex and Dangerous Mountainous Area Based on Hyperspectral
Authors: Cai Jianhua , Wang Lijuan , Huang Yongwei , Chen Dayang , Liu Huan 
Published: April 2020

Abstract
In view of the difficulties during implementation of conventional survey methods for railway projects in complex and dangerous mountainous areas, the section from Maoxian to Songpan in Chengdu-Lanzhou Railway with complex terrain and bad climate is selected as the research area to extract hyperspectral remote sensing technology content of the research area. Based on the research of indoor hyperspectral image processing, outdoor rock sample collection and indoor spectrum analysis, establish a suitable feature extraction and lithologic recognition classification method according to the unique spectrum integration feature of hyperspectral remote sensing image. Use the visible short wave infrared hyperspectral data of the latest domestic Gaofen-5 satellite, carry out the lithologic plotting experiment in the key areas of the section from Maoxian to Songpan in Chengdu-Lanzhou Railway, and make accuracy evaluation by selecting a certain way for the mapping results. It provides important thematic information for regional lithologic investigation, and provides strong technical support for selection, survey and design of Chengdu-Lanzhou Railway construction, which is helpful for similar projects.