bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of Landslide Susceptibility Based on Logistic Regression Model
Authors: Du Zhen , Zhang Biao , Hu Hong , Bao Junji , Li Wenbin 
Published: March 2020

Abstract
A lot of methods can be used for landslide susceptibility evaluation, such as support vector machine model, artificial neural network, etc. These models have good modeling effect, but often have the problem of low modeling efficiency. Hence, this paper proposes a simple and effective model of landslide susceptibility evaluation - Logistic regression model. The Ningdu county of Jiangxi province in China, with 297 recorded landslides, was used as study case. The 6 environmental factors including elevation, slope, profile curvature, distance to rivers, lithology and NDVI were extracted in this study. The analysis showed that the significance of Profile curvature was greater than 0.05, and there was a collinearity problem, so it was excluded. After the establishment of the factor evaluation system, the prediction rate curve is used to evaluate the accuracy of the model. The results show that the AUC value of the prediction rate curve of logistic regression model is 0.864, indicating that the evaluation accuracy of logistic regression model is high and the modeling is reasonable. In addition, landslides in the study area are mainly distributed along both sides of the rivers, and elevation and lithology play a major role in the occurrence of landslides.
Analysis of water use efficiency and influencing factors of agricultural total factors in Beijing-Tianjin-Hebei region
Authors: Fang Jinghui 
Published: March 2020

Abstract
In this study, super efficiency SBM-DEA model was used to estimate the total water use efficiency of agricultural factors in the Beijing-Tianjin-Hebei region from 2000 to 2013, and on this basis, panel Tobit model was used to test the influence of natural conditions, water conservancy facilities, agricultural production conditions and social and economic conditions on the total water use efficiency of agricultural factors. The results show that although the overall water use efficiency of agriculture in Beijing-Tianjin-Hebei region is higher than the national level, there is still room for improvement. In the future, it should strengthen the protection and cooperation of agricultural water resources and water-saving technologies in the three regions. shared; The ratio of groundwater to water supply structure and the price index of agricultural production materials have a significant positive impact on the water efficiency of all-factory agriculture in Beijing-Tianjin-Hebei. The reservoir capacity, animal husbandry and fishery account for the proportion of total value of agricultural output the per capita cultivated land area, and the per capita net income of rural households. The quality of rural labor has a significant negative impact on the water efficiency of all-factory agriculture in Beijing, Tianjin and Hebei.
Study on the Migration of Heavy Metals in Different Substrates of Wetland System
Authors: Cao Tingting , Chen Aixia , Li Juan 
Published: March 2020

AbstractIn order to study the solidification characteristics of heavy metals in different matrices, this paper intends to study the migration and distribution characteristics of heavy metals such as Cd, Cr, Pb, Zn, Cu in different matrix ratios of wetland systems. The vertical subsurface flow process (bean stone+gravel hollow brick) matrix, horizontal subsurface flow process (sand+slag+crushed hollow brick) matrix has better accumulation effect on Zn; vertical subsurface flow process (bean stone + gravel) matrix has more cumulative effect on Pb Good; the accumulation effect of Cu and Cr on different substrates is not obvious; the accumulation effect of horizontal subsurface flow treatment unit (sand + slag + gravel) on Cd is better than that of (sand + slag + gravel hollow brick) matrix. The content of Cd, Cr, Pb and Zn in the matrix of vertical subsurface flow (bean stone+gravel) is significantly correlated with the distance along the path. The content of Cd, Pb and Zn in the matrix of (bean stone+gravel hollow brick) is related to the distance along the path; the content of Cd, Cr, Zn in the horizontal subsurface flow process (sand+slag+gravel) matrix is significantly correlated with the distance along the path, (sand + slag + gravel hollow brick) matrix, (bean stone+slag) matrix Cr The content of Cu, Pb and Zn is significantly correlated with the distance along the path. The content of Pb and Zn in the matrix of sand (gravel + gravel) is significantly correlated with the distance along the path.
Experimental Study of Imbibition with Normal Fracturing Fluid in Low-permeability Reservoirs
Authors: Huang Feifei , Pu Chunsheng , Lu Leichao , Yan Huanfeng , He Xiaolong , Liu Bo 
Published: March 2020

Abstract
As the volume of fracturing fluid injected in the formation is getting larger and larger, there is more attention paid to the imbibition efficiency of the broken fracturing fluids. The fracturing fluids, including water-base gel fracturing fluid, thickened water fracturing fluid, slippery water fracturing fluid, emulsified fracturing fluid and clean fracturing fluid were chosen to do the spontaneous imbibition experiment with natural core samples from the Ordos Basin. Furthermore, the correlation between the parameters including viscosity, interfacial tension and contact angle and the recovery ratio was studied respectively. The result showed that the broken fracturing fluids of water-base gel and thicken water performed the highest recovery ratio of spontaneous imbibition, which were 23.1% and 20.6% respectively. Meanwhile, the correlations between those parameters and recovery ratio were contact angle, viscosity of broken fluids and interfacial from in turn in the experimental situation. What’s more, both the contact angle and the viscosity showed negative correlation to imbibition recovery ratio while the interfacial tension showed positive correlation. This study provides help to the researchers to understand the mechanism of fracturing fluids imbibition in low permeability reservoirs.
Evaluation of Intensive Land Use and Countermeasure Prospects in Hexi Corridor of China
Authors: Geng Yonghao , Xiao Bingyu 
Published: March 2020

Abstract
Influence of “Belt and Road ” international cooperation initiative is continoualy expanding. Hexi Corridor in China, as an important geographic area of the land Silk Road, its development degree and influence are constantly prominent. In order to promote efficient and intensive development of Hexi Corridor area, the development data of Hexi Corridor area in recent years are collected from several dimensions in recent years. By using entropy method and tobit model, this paper evaluated degree of intensive land use in Hexi Corridor, to find out the experience and shortcomings of urban development in Hexi Corridor.Then the trend of urban land use and urban development in Hexi Corridor are explored and corresponding countermeasures are put forward.
A Cost-Benefit Analysis Model Based on NPV Methods and Full Life Cycle of Land Use Projects
Authors: Qi Xin , Li Xinye , Jin Jinghua 
Published: March 2020

Abstract
If you realize that your sweet house will damage the ecosystem, you must be amazed. In fact, most land use projects around us affect ecosystem services directly and even result in environmental degradation. The environmental cost has caused a reduction in economic benefits presumably, nonetheless, which has never attracted enough academic attention. To show the real economic cost of land use projects, we establish an ecological services valuation model based on the governance cost method. When assessing the environmental costs caused by pollution, we evaluate the paid economic costs for the pollution control and the virtual cost that should have been paid for pollution abatement. When assessing the costs caused by non-pollution factors, we compute the economic value of regional ecosystem service value according to Costanza indicator system and the value of localized carbon storage and carbon sequestration based on the INVEST model.
Research and Application of Information Perception Technology for Mine Safety Helmet
Authors: Yang Yong , Wang Qinsheng , Guo Xiucai 
Published: March 2020

Abstract
Based on wireless sensor network technology in the Internet of Things, this paper studies and designs a mine environment perception system that is used in coal mines. The sense layer adopts the wireless sensor network based on WIFI technology, takes the miner safety helmet as the carrier, integrates the function module with STM32F107 controller as the core, and becomes the mobile node of the underground wireless sensing network, and realizes the monitoring of the miner’s work environment information and the underground personnel positioning. Through the test, the intelligent mobile terminal can actively perceive the surrounding environment of the underground personnel, realize the real-time monitoring and intelligent warning of the gas concentration, carbon monoxide concentration and temperature in the surrounding area of the miners, and can provide the positioning information for the ground-based biter, which is an important supplement to the safety monitoring of coal mine in China.
Study of landslide susceptibility prediction based on information value model: a case study of Ningdu area
Authors: Yan Ziyue , Zhang Biao , Guo Jianfei , Chen Jiawu , Cao Zhongshan 
Published: March 2020

Abstract
The landslide susceptibility prediction(LSP) is of great importance to the prevention and control of regional landslide geology disasters. Taking Ningdu County of Jiangxi province as an case, this study obtains a total of 297 landslide locations in the study area and selects ten conditioning factors (elevation, slope aspect, slope, profile curvature, plan curvature, topographic relief, distance to rivers, lithology, NDVI, NDBI). The information value model(IVM) is used to predict the landslide susceptibility and the receiver operating characteristic curve (ROC) is adopted to evaluate the prediction accuracy of IVM. The result shows that the area under ROC (AUC) value of IVM is 0.838. It can be seen that IVM has a good prediction accuracy and also obtains a reasonable distribution characteristics of landslide susceptibility.
Multi-body dynamics simulation and analysis of a nuclear power waste crane
Authors: Zhang Yu , Li Baoqun , Gong Yajun , Zeng Baoping 
Published: March 2020

Abstract
The dynamic performance of nuclear waste crane is an important index to ensure its safety and reliability. In this paper, a multi-body dynamic model of nuclear power waste crane is established by using the method of Udwadia-Kalaba equation, and its simulation analysis is carried out to verify the feasibility of the application of this method in heavy equipment design.
Simulation and Result Analysis of Bridge Backfilling Process Based on ANSYS
Authors: Cheng Bin 
Published: March 2020

Abstract
The covered bridge of corrugated steel has many advantages, one of which has good adaptability to deformation. It should be noted that as a flexible arch structure, it is necessary to pay attention to the backfilling and expansion scheme. According to the available data, it is clear that modern researchers conduct analysis and research on experimental models and actual projects, and test the deformation and internal forces of the bridge and culvert structure of the backfilling project, but there is no impact on the backfill construction structure. Mechanics factors are studied and analyzed. In order to make up for this gap, this paper uses finite element software to build the model based on the actual engineering, and then calculates a variety of different backfilling schemes to study the influence of internal force and structural deformation of different backfilling schemes on structural mechanics. Researchers provide relevant references for research.
The Ventilation Improvement Assessment of Sky Gardens-A Case Study of Hysan Place
Authors: Liu Siqi , Huang Guanqi 
Published: March 2020

Abstract
With the modernization and urbanization in recent decades, a mounting number of buildings has been built. Due to the limited land, these buildings were built higher and higher and side by side which created ‘Wall Effect’ blocking the wind and reducing air ventilation. It eventually led to bad thermal comfort of people. Therefore, sky gardens are increasingly important today, as they can significantly contribute to improving air ventilation by reducing ‘Wall Effect’. In order to know better about the influence generated by sky gardens to natural ventilation improvement, I selected the Hysan Place as a case study based on CFD simulation. I built two models --- the original model and the model without sky gardens for the simulation in different height. By comparison of different models, I found that the sky gardens of Hysan Place did can slight improve air ventilation of surrounding areas. Sky garden is an effective method to alleviate urban heat island effect, which is important to improve urban living quality, especially extreme high construction density.
Wind Tunnel Experimental Simulation of Downburst Outflow Based on Wall Jet Model
Authors: Hong Yiran , Li Cangmao , Xiao Yunfeng , Zhou Jiao 
Published: March 2020

Abstract
In order to study the wind field characteristics of downburst wall jet section, the wind tunnel test of downburst wall jet section was carried out by modifying the traditional wind tunnel with fan and nozzle. By using characteristic length and characteristic velocity to deal with it dimensionless, the consistency and effectiveness of simulating the downburst section by using wall jet steady state wind tunnel test were verified according to the test results of different rough wall jet flows downstream. Consistency and validity; by increasing the roughness element to change the blocking ratio at the bottom of the wind tunnel and increase the disturbance of the incoming flow, the topography of various atmospheric boundary layers is simulated, and the effects of the surface roughness of the wall jet section on the horizontal and vertical profiles of the wall jet area, the maximum wind speed height and the wall flow field in downburst flow are studied. The experimental results show that the dimensionless treatment of wall jet with different roughness has certain self-similarity. With the increase of wall roughness, the turbulence near the wall increases significantly, the internal and external peaks of the turbulence profile increase significantly, and the velocity at the lower part of the wind profile decreases gradually, which has a significant impact on the characteristics of the near-wall wind field.
Modeling and Jitter Suppression Analysis of a Lifting Multistage Hydraulic Cylinder
Authors: Luo Chunlei , Ling Chunlai , Luo Daming 
Published: March 2020

Abstract
In view of the abnormal phenomena in the movement of the 4-stage hydraulic cylinder, this paper establishes the basic motion model of the multi-stage hydraulic cylinder by melting point nodal cavity method, and analyses the variation law of its external load. On this basis, the erection process of the multi-stage hydraulic cylinder is simulated and analyzed by AMESim, and it is found that the sudden change of pressure at the change of the stage will cause the vibration of the multi-stage. Found that the abnormal vibration of the third piston occurs during the retraction process of the hydraulic cylinder, which is caused by the insufficient guide distance of the 3 stage piston of the multi-stage hydraulic cylinder. The sealing conditions of the piston and the guide sleeve are improved by increasing the guide length of the piston appropriately, and the correctness of the improved scheme is verified by the way of simulation, that is, it can effectively suppress the vibration of the third piston. Vibration occurs during retraction. Some improvement suggestions are provided for vibration reduction of multi-stage hydraulic cylinder.
Research on the Age of Coal-bearing Strata in Beishan basin group of Gansu-Inner Mongolia Region
Authors: Niu Haiqing , Han Xiaofeng , Cui Haifeng 
Published: March 2020

Abstract
Although the coal measures strata of Beishan Basin group in Ganmeng were discovered earlier, due to the low degree of geological work and the lack of comprehensive data system research, the geogical age of coal measures strata is not consistent. In order to clarify the age of coal measures strata in the basin group and the exploration prospect of coal, uranium, oil and other resources in the research area, the geological age of coal measures strata in Beishan basin group was Researched, based on the systematic summary of paleontology, tectonic evolution, lithologic characteristics and coal and rock industrial characteristics, combined with the analytical and laboratory data supplemented by the research team, the comprehensive analysis shows that: the age of the formation of the coal measures in Beishan basin group should be the early cretaceous of the Middle Jurassic.The geogical age of the coal measures in southern of the basin group is the Jurassic, and the northern coal measures are mainly early cretaceous.The western margin of Yinhe basin is adjacent to Beishan basin group, and the coal measures strata are comparable to each other, which can provide the basis for the age of coal measures strata revealed by drilling holes in the western margin of Yinhe basin.
Analysis of Transient Pressure Source Characteristics of Trim Balance Pipeline System
Authors: Shen Wei , Hu Zhi 
Published: March 2020

Abstract
Based on the hydraulic calculation of AMEsim software, adjust the pipeline and working conditions of the trim balance system, and explore the influence of water transfer pressure, pipeline length and valve closing time on the transient pressure fluctuation during the working process, and obtain the pressure change law and corresponding Relationship, according to the analysis gives preliminary optimization suggestions, sums up the scheme and scope of reducing water transfer pressure, shortening pipeline length, extending valve closing time, providing reference for optimizing system design and control, and proposing control from noise source level The method of transient noise caused by water hammer phenomenon provides an idea for controlling the transient noise of pressurized pipelines of ships and underwater vehicles.
Research on Optimization Design of Dual Derrick for Offshore Platform Based on RSM
Authors: Jiang Faguang , Zhang Min , Yang Xiuju , Zeng Xingchang , Liang Zheng , Li Dayang 
Published: March 2020

Abstract
The structure of dual derrick for offshore platform is optimized in this study. The special arrangement is establishing a mathematical model to minimize the stress and mass of dual derrick. The beam is divided into vertical, horizontal and oblique beam. The beam’s section sizes are design variables. After calculating test point data by ANSYS under operating conditions, the multi-objective optimization method is adopted to solve the optimal section size based on the regression equation of RSM fitting influence factors and response variables. This study will check the safety of the optimized dual derrick under storm self-storage conditions. The result shows that dual derrick meets safety requirements under extreme conditions, the optimized structure’s mass reduced about 21.2%, and the maximum safety factor increased about 8.3%.
Study on the Purification of TN in Different Concentration Waters by Artificial Floating Bed
Authors: Chen Hongbing , Deng Meie , Lu Jindeng 
Published: March 2020

Abstract
The artificial floating bed reduces the nitrogen, phosphorus and organic pollutants in the water by the absorption of the roots of the plants, thereby purifying the biological control of water quality. In this paper, by using four different concentrations of contaminated water samples, the static test of Ipomoea aquatica. was carried out on a floating bed. The growth characteristics and main water quality indexes of the plants were measured at intervals of 10 days. The experimental period was 60 days, and the amaranth was quantitatively analyzed. The purification law of TN in water samples with different concentrations was analyzed, and the dynamic changes of nutrients in different tested water samples were analyzed, and the purification equation was constructed. The results showed that the floating bed cultivation of leek can absorb, adsorb and degrade the nitrogen in the water sample, carry out metabolic activities, and synthesize the substances needed by itself, which is closely related to the growth, and the TN concentration and the growth time of the plant are significantly negative.
3D Simulation of Flight Control System for Quad Tilt Rotor UAV Based on Flightgear
Authors: Wang Zhigang , Li Jianbo 
Published: March 2020

Abstract
The quad tilt rotor (QTR) has complex dynamics characteristics, especially in conversion mode. It is difficult to model the QTR dynamics and the environmental factors have a great influence on it. To solve the problem of control in conversion mode of QTR, this paper carries out the design of the controller based on improved active disturbance rejection control (ADRC). We propose the 3D simulation based on FlightGear to better reflect the state of quad tilt rotor in conversion mode. The simulation results show that the flight control system is effective. The 3D real scene simulation can directly observe the status of every control mechanism, which can provide a better and more intuitive analysis for manipulation strategy.
Structural Design and Mechanical Analysis of Horizontal Transport Device for Spacecraft Marine Transportation
Authors: Dai Hailin , Du Ruizhao , Jiang Xu , Li Yushuang 
Published: March 2020

Abstract
As a large spacecraft used to transport up-going cargo and test load equipment to space, cargo spacecraft is an important means of space transportation for material transportation and replenishment of China’s space station in the future. The cargo spacecraft is the first large-scale spacecraft to be transported by sea in China. In this paper, a cargo horizontal conveyor is designed. The mechanical structure of the device is introduced, and the finite element analysis is carried out. The results show that the structure of the horizontal conveyor is reasonable, and its mechanical properties meet the requirements of use.
The Mathematical Route Model Based on Analytic Hierarchy Process
Authors: Pan Zeen , Yue Chuanmengzhen , Zhang Yanbing 
Published: March 2020

Abstract
In 2017, a devastating hurricane attacked the United States territory of Puerto Rico and caused severe damage. In the meanwhile, it set great obstacles to the aid work. Therefore, the non-government organization puts forward one possible method that we would use the drones to succour the disaster area. Hence, our model aims to develop a comprehensive program to tackle this issue. Our model has three parts. First of all, we compare the weighting average of all requirements and then select the drones with high performance via the analytic hierarchy process. After considering the distribution of the hospital, we formulated two possible transporting strategies and the corresponding transporting sub-route, including star routes and the ring routes. In the third part, we obtain some intuitional constraints from the routes via some mathematical definitions, directly showing the performance of the drone under the effect of these external causes.