bluuebunny/crossref_metadata_2025_split huggingface dataset:
Airport Passenger Throughput Forecast Based on PSO-SVR Model
Authors: Li Yuanxun , Jiang Xiushan 
Published: April 2020

Abstract
Accurate prediction of airport passenger throughput can provide a scientific basis for airport construction, aircraft procurement, and route planning. Based on the characteristics of airport passenger throughput, the support vector regression machine prediction model based on particle swarm optimization (PSO-SVR) is proposed. First, the conditional attributes and decision attributes are selected in the historical data of airport passenger throughput. Secondly, the particle swarm optimization algorithm is embedded to optimize the kernel function parameters and penalty factors. Finally, the support vector regression machine is used to predict the airport passenger throughput in the next year. Beijing Capital, Shanghai Pudong, Guangzhou Baiyun and Chengdu Shuangliu were selected as examples to verify the validity of the model. And compared with the moving average method, exponential smoothing method, ARIMA precision. The results show that the PSO-SVR model improves the prediction accuracy, and the average absolute percentage errors for the four airport throughput forecasts are 3.21%, 4.37%, 2.38, and 4.43%, respectively.
Analysis of Causes of Bank Collapse in Jiangxinzhou Section of the Lower Reaches of the Yangtze River
Authors: Cheng Xiaobing , Li Wangsheng 
Published: April 2020

Abstract
The Jiangxinzhou section is located in the Wuhu-Nanjing section of the lower reaches of the Yangtze River. It is the throat section connecting the downstream 12.5m deepwater channel and the middle reaches of the Yangtze River “645 Project” project. In the river section, the first phase of the channel improvement of the river section from Jiangxinzhou to Wujiang was implemented from 2009 to 2010. Since the implementation of the project, the left bank of Pengxingzhou to Jiangxinzhou in the river section has repeatedly collapsed during the construction period and after the handover. The effects of the revetment project and the overall problems are adverse. This paper analyzes the external environment and internal factors of the 11 collapses on the left edge of Jiangxinzhou from Pengxingzhou from 2009 to 2015. It summarizes the characteristic parameters of several bank collapses and studies the types of bank collapse. The mode of its collapse was explored. Combined with the research results of collapse type and collapse mode, the principles and key points of bank protection are proposed.
Study on flow characteristics of rough undulating single fracture based on CFD
Authors: Liang Shu 
Published: April 2020

Abstract
The cubic law is the basic law to describe the seepage in the cracks of parallel plates. However it can not be directly used to describe rough undulating fracture. By using the method of computational fluid dynamics, the law of water flow in rough undulating fractures with different roughness, fracture width, hydraulic gradient and fracture length is studied. The cubic law is modified and the mathematical formula of equivalent fracture width is established.
Impact of Efficient Logistics and E-WOM regarding Online Purchase Intentions of University Students in Karachi
Authors: Asghar Shayaan , Mahmud Bahri 
Published: April 2020

Abstract
The study aimed to determine relationship among trustworthiness, reverse logistics, relevance, quality, timeliness and customers purchase intention. The online outline had been scattered to 15 universities in Pakistan with electronic long range informal communication framework and email. The study samples were Pakistanis who were general online purchasers. The selected respondents were online buyers who usually did shopping online in Pakistan. The respondents were from different universities from Karachi which included students from various faculties. Information was used factual procedures of variable investigation, relapse and connection. The factual system was used SPSS programme. The descriptive analysis was used to analyse statistical research. Meanwhile, total of 200 different questionnaires were presented to target population. The result showed reverse logistics, trustworthiness and timeliness had significant influenced on buyer purchase intension. Besides, quality and relevance had no significant with buyers purchase intention. The substantial investment is needed by policy makers to ensure that reverse logistics is developed in an effective manner.
Optimization of Air Logistics Transport Network of YTO Express
Authors: Tong Zeping , Meng Fanyue 
Published: April 2020

Abstract
In order to improve the overall level and long-term development of YTO Express, according to the development strategy and planning of YTO Express logistics, this paper puts forward the construction of Hub-and-Spoke air logistics transport network with core hub airport, and optimizes YTO Express transport network. Firstly, the cluster analysis function of SPSS is used to divide the region of the air node, and then the center of gravity method is used to select the regional hub point, and the core hub airport and the regional hub airport are determined, so as to design the final transport network, which is conducive to the sustainable development of YTO Express, and improve the proportion of YTO Express in the air field.
3D Numerical Simulation of the Influence of Drilling-blasting Subway Construction on Subgrade Settlement
Authors: Yu Yongyan , Wang Jiliang , Du Tianling , Liu Ying 
Published: April 2020

Abstract
Based on the tunnel between Junfeng road-Xiliuzhuang of Qingdao metro, the tunnel excavation model is established by FLAC3D software. The established calculation model mainly includes:(1) Free field boundary conditions are adopted around and at the bottom of the model;(2) The blasting load is simulated by triangle pulse wave;(3) According to the peak value V of the surface velocity, the peak value Pmax
of the velocity in the triangular pulse wave is calculated by Sadovsky formula;(4) The calculation results show that the vertical settlement of subgrade is more significant when compared with horizontal settlement;(5) the calculation results are in good agreement with the field monitoring data. It shows that the method can simulate the dynamic characteristics of the model and reflect the dynamic response of subgrade settlement.
Study on the evolution of dynamic performance of high-speed EMU after long-term service
Authors: Wang Qi , Cui Tao , Shi Junjie , Sang Hutang 
Published: April 2020

Abstract
In order to find the influence of wheel and rail wear about dynamic performance of the high-speed railway vehicle in the actual operation process, a high dimensional strong nonlinear dynamic model of the high-speed vehicle is established, and measured wheel profile is used to characterize contact geometry between wheel and rail, and relationship between stiffness of steering rubber joint and dynamic performance of railway vehicle is studied in different wheel/rail wear state. Results show, With the increment of wheel and rail wear and equivalent conicity, that stability of hunting motion of vehicle decreases, stability and safety of the vehicle all deteriorate. Moreover, with the increment of longitudinal steering joint stiffness, critical speed, lateral stability and safety of vehicles increases gradually. When it goes above 17.5MN/m, with the increments of critical speed, lateral stability and safety tend to be stable. With the increment of lateral steering joint stiffness, critical speed of vehicle tends to increase first and then decrease, and finally tends to be stable around 5MN/m, which reaches the maximum when the stiffness is 2.5MN/m. Lateral stiffness of steering joint has little influence on lateral stability of the vehicle; At low equivalent conicity, vehicle running safety decreases slightly with the increment of lateral stiffness of steering joint, while equivalent conicity increases, the vehicle running safety deteriorates sharply with the increase of lateral stiffness of steering joint. In conclusion, in order to adapt to different equivalent conicity, the optional range of longitudinal stiffness of steering joint is suggested to concentrated in 5∼17.5MN/m, while its lateral stiffness is suggested to be within 2∼5MN/m.
Economic Development Advantages of Low-Carbon Economy under Waterway Transportation
Authors: Jing Mei , Zheng Weigang 
Published: April 2020

Abstract
With the continuous deepening of economic development, ecological hidden hazards such as environmental pollution are gradually emerging. Global warming, over-exploitation of energy, land desertification, and other problems are emerging. It is urgent to grasp the direction of national environmental protection policy support, and take the advantages and disadvantages of low-carbon economy development as the primary merit index for industry development.
Firstly, this paper expounds the internal relationship between water transport and low-carbon economy. Then it objectively examines and analyzes the difficulties and reasons of the development of waterway transportation economy in low-carbon economy. Next, it is pointed out that the water transport system under the background of low-carbon economy is an inevitable choice. Finally, the paper summarizes the advantages of the economic development of waterway transportation, and puts forward the corresponding optimization countermeasures according to the actual situation, which provides an effective guarantee for deepening the low-carbon behavior of transportation.
Pricing and Advance Ordering Strategy for Prefabricated Building Assembler
Authors: Jiang Wen , Shi Kanfeng 
Published: April 2020

Abstract
This paper studies an advance order strategy for prefabricated building assembler. We study how advance strategy affect assembler’s profit, and assembler how to choose strategy to meet consumer demand. In contrast to much of the literature, we introduce time sensitivity of consumer into the demand function, and divide prefabricated components into standard and nonstandard components to highlight the characteristics of prefabricated building. Furthermore, we present two different order strategies. In one strategy, assembler orders all components once costumers’ order arrives in one time, consumer have longer waiting time. In another strategy, assembler orders standard components in advance and orders nonstandard components until consumers’ order arrives. Our results show that assembler can make decision in different situations to achieve optimal profit, and satisfy consumer demand.
Analysis of precipitation time characteristics in key water demand period of main crops in Western Guanzhong
Authors: Qu Tong , Xia Cong , Huang Lingmei 
Published: April 2020

Abstract
Based on the daily precipitation data of seven meteorological stations in the western part of Guanzhong area from 1970 to 2016, the time characteristics of precipitation series are analysed by using the methods of sliding t-test, wavelet analysis and R/S. The results showed that the annual precipitation, summer maize and winter wheat precipitation in the key water demand period generally showed no significant downward trend, and there is no significant mutation point. It will maintain the change characteristics consistent with the recent historical period in the future, which provides certain reference for the regional water resources planning and reasonable allocation, agricultural planting structure adjustment, and irrigation system improvement.
Spatial-temporal Variations in Lakes in Central Yunnan Province from 1987 to 2017
Authors: Lv Jie , Yuan Xiping , Gan Shu 
Published: April 2020

Abstract
Lake spatial-temporal variations are sensitive records of climate and environmental changes, directly reflecting global changes. Lakes have great ecological and economic benefits, which play an important role in improving the ecological environment of the river basin, regulating surface and underground runoff, irrigating farmland, breeding aquatic animals and plants, maintaining biodiversity, flood control and disaster reduction, and producing and drinking water. In this paper, we took lakes in central Yunnan province as the research object, based on Landsat TM, ETM+ and OLI remote sensing images data in the period from 1987 to 2017, the vectorized boundary of 5 lakes with areas greater than 30 km2 in central Yunnan were obtained by artificial visual interpretation technology and the causes of lake variations were analysed. Several conclusions can be drawn from the present study: (1) From 1987 to 2017, the total lake area in central Yunnan increased from 603.86km2 to 605.71km2.(2) During the study period, the lake area in central Yunnan increased as a whole, but also showed obvious spatial differences. According to the change of lake area, the study area can be divided into three types: stable, expanding and shrinking. Dian chi lake area is a lake area expanding area. Yang zonghai lake area is a shrinking lake area. (3) Influenced by the complex natural and cultural environment in the study area, the reasons for the change of lake area in different areas are different.
Risk Assessment of Marine Hydrodynamics for Coastal Engineering
Authors: Gao Feng , Wang Yue , Zhao Xu , Xu Ya-nan , Tan Zhong-hua 
Published: April 2020

Abstract
Risk assessment in marine hydrodynamics is an important part of ocean disaster and risk analysis. Its key scope lies in the identification of hydrodynamic risk factors and the forecast of their severity which is one of the most effective approaches to improve disaster protection capability, control risk and reduce damage and loss during a disaster. Haikou Bay is located off the north coast of Hainan Island, within Qiongzhou Strait, and close to the South China Sea.The most significant marine hydrodynamic disasters in the waters of Haikou Bay include storm surge, extreme waves and tsunami. The Holland wind and Monte Carlo method were integrated to predict storm surge elevation, and the SWAN model with the Pearson method was used to calculate the extreme waves and using USGS source parameters to predict tsunami waves. High water surface elevations are 3.75m, 3.02m and 2.68 with a return period of 500, 100 and 50 year respectively at Xiuying; an extreme water surge up to 4.42m from the Probable Maximum Storm Surge analysis; significant wave heights present with different return periods and wave directions; the maximum tsunami wave amplitude reaches 2.25m in case of all fault plates under a 9.0 earthquake.
Optimal Pricing and Assembly Rate for Prefabricated Construction Assembler with Subsidy Policy
Authors: Jiang Wen , Qi Xian 
Published: April 2020

Abstract
With the development of the construction industry, assembly construction has received an increasing number of attention. The government introduced subsidy policy to promote prefabricated construction. We have considered subsidy into the traditional prefabricated construction, in which case decision on retail pricing and construction assembly rate will be complicated. We discussed the impact of subsidy policy on assembler pricing and assembly rate. The paper finds that subsidy policy can lower the retail price of prefabricated construction and increase the assembly rate, the assembler must control the cost factor for increasing assembly rate within a certain range to obtain higher profit.
Fuzzy evaluation method of pipeline passing through dike based on Uncertain Analytic Hierarchy Process
Authors: Ma Ying , chen Xiaozhen 
Published: April 2020

Abstract
In view of the characteristics of many factors influencing the safety risk of the pipeline through the embankment, which are hierarchical and uncertain, this paper combines the uncertain analytic hierarchy process (AHP) and fuzzy operation to establish a fuzzy comprehensive evaluation model. The uncertainty analytic hierarchy process (AHP) was used to determine the weight of the evaluation indicators, considering the uncertainty of the relative importance of the evaluation indicators at the same level, the credibility of experts and the degree of difference. According to the principle of maximum membership degree, the evaluation grade of the pipeline is determined. Finally, the feasibility of this method is verified by combining with specific engineering examples to reduce the potential loss and provide the safety management of the pipeline.
Analysis of spatial-temporal differentiation and influence factors of construction land expansion of the urban agglomeration in central Yunnan
Authors: Lin Yilin , Zhao Junsan , Zhang Meng , Chen Guoping 
Published: April 2020

Abstract
This paper takes the plateau mountain city: the urban agglomeration in central Yunnan as the research area, 2000-2015 as the research period, and measure and analyze the spatio-temporal differentiation of construction land expansion in the urban agglomeration based on the calculation of kernel density. Use the spatial autocorrelation model to analyze the spatial autocorrelation patterns of construction land on the 1 km × 1 km grid scale, and then use the GIS spatial analysis technique to study the local aggregation area at the p<0.05 significance level of the construction land in relation to natural and social driving factors. The result shows that the growth and distribution of urban construction land in this urban agglomeration is affected by natural social factors and land policies, and the area of construction land is growing rapidly. The areas with large distribution density of construction land at four time points are mainly located in flat dam area in the central and eastern part of the urban agglomeration, and mountain in the northern part. The spatial distribution of construction land in this urban agglomeration from 2000 to 2015 is mainly represented by two patterns: high-high aggregation and low-low aggregation. The topographical features dominated by plateau mountains affect the local spatial clustering of the construction land. At 4 time points, the elevation is 1000∼3000 m, the slope is between 2°-25° and the sunny slope area is the area with the largest distribution and the most concentrated area of the construction area. The farther away from the water system and the road, the local space gathering area of construction land is decreasing.
Applicability Analysis of Drought Index in Shandong Province
Authors: Shen ZhenTao , Zhao Qiang , Yao Tian 
Published: April 2020

Abstract
The frequent occurrence of drought disasters restricts the agricultural development of Shandong Province. To analyze the drought situation in Shandong Province reasonably, the selection of drought index is particularly important. In this paper, the standardized precipitation index SPI, precipitation Z index and precipitation anomaly Pa of each city in the dry years of Shandong Province were calculated, and the drought of Shandong Province was analyzed by ArcGIS software. The applicability of the three drought indices in Shandong Province was compared. The results show that: in November 2010, the SPI index was better reflected in the drought, the Z index did not show the mega-arid area, and the Pa index exaggerated the drought in some cities; in March 2011, the Z-index showed that most cities were Light drought, SPI index reflects better than the Pa index for drought; in August 2014, Pa index monitoring showed that more than half of the cities were light drought, Z index showed that most cities were moderately dry, and the SPI index monitoring results were similar to the actual drought conditions; In October 2015, the Z index showed that more than half of the cities had no drought. The monitoring results of the Pa index for some cities were opposite to the actual ones. The monitoring results of the SPI index were consistent with the actual drought conditions.
Spatial pattern analysis of Higher Geographical Education in China
Authors: Qiang Zhao , Qian Gao , Pengyu Ran 
Published: April 2020

Abstract
In order to analyze the spatial pattern of higher education in geography science in China, the data of geographic science colleges and universities and the total population and GDP of each region were established in 2007, 2011 and 2016, based on ArcGIS 10.3 spatial analysis and formulas such as extreme value ratio, discrete coefficient, geographic concentration index and related analysis methods. The research shows that the gap in the scale of inter-provincial development of geography science majors in China is gradually increasing, but the distribution imbalance of institutions is gradually decreasing. The spatial pattern is formed by the combination of topography, population, economy, and policy. There are still some problems today. Finally, the countermeasures and suggestions for promoting the rational development of the spatial pattern of higher education in geography science are put forward.
Mountain flooding analysis based on SCS-CN model – A case study in Mingxi, China
Authors: He Xinyue , Chen Chao , Liu Yue 
Published: April 2020

Abstract
Flood and waterlogging disaster occurs frequently, which seriously threatens people’s life and properties. The SCS-CN model takes into account the characteristics of various factors such as rainfall, soil type, land use, soil moisture and surface runoff. In this paper, the SCS-CN model is introduced to the analysis of flood inundation in mountain areas. Firstly, remote sensing data, land use status map, topographic map are used to obtain land-use type, slope and other data. Then, watershed analysis is carried out based on SCS-CN model to obtain runoff data. Finally, based on rainfall data, the inundated area is estimated, and the spatial and temporal distribution characteristics of inundation area were analyzed from the perspective of land use. The experimental results of Mingxi county in Fujian province, China show that this method is effective for the analysis of flood inundation in mountainous areas.
Study on the Spatial-temporal Differentiation and Driving Mechanism of Ecological Vulnerability in Zhangye City
Authors: Jun Luo , Xuebin Zhang , Hongmei Ding 
Published: April 2020

Abstract
Based on the “Sensitivity-Pressure-Resilience” evaluation model, combined with the spatial principal component (SPA) analysis method of GIS, we evaluated the ecological vulnerability of Zhangye City in 2000, 2005 and 2010, then we used geographical detector model to analyse the main driving factors of the ecological vulnerability. The results showed that: 1. The ecological vulnerability of Zhangye City was higher in the West and lower in the East. The average value of ecological vulnerability index was 0.45, which was mild fragile, ecological vulnerability index was the highest in Linze county, and the lowest in Minle county. 2. The overall ecological vulnerability showed a trend of improvement from 2000 to 2010, due to the increase of precipitation in 2005, the ecological vulnerability index was higher than that of 2000 and 2010. 3. Geographical detector results showed that six factors could explain the ecological vulnerability, which ranked as: rainfall in flood season (0.1138) > temperature in high temperature season (0.1116) > elevation (0.0581) > vegetation coverage (0.0532) > topographic relief (0.0411) > biological abundance index (0.0384), and the interaction of the 6 factors had a stronger explanatory power to the ecological vulnerability.