bluuebunny/crossref_metadata_2025_split huggingface dataset:
Time-dependent Seismic Fragility Analysis of Buried Steel Pipes in Alkaline and Near-Neutral Soil Environments
Authors: Liu Xiaohang , Zheng Shansuo , Wu Xingxia , Zheng Yue 
Published: February 2021

Abstract
In alkaline and near-neutral soil environments, the mechanical and seismic performance of buried steel pipes degrades with deepening corrosion over time. To study the seismic fragility of buried steel pipes of different service ages in these environments, an incremental dynamic time history analysis of typical pipes was carried out with the time-varying constitutive model of steel. A probabilistic seismic demand model for buried steel pipes of different service ages in alkaline and near-neutral soil environments was then established, which can characterize the probability relationship between the ground motion intensity and structural response. Furthermore, on the basis of the tristate criteria, the limits of each ultimate failure state were determined. Time-varying seismic analytical fragility models of the pipes, including pipe units in two different soil environments and four service ages, were then established, which can characterize the probability of different failure states of structures under different earthquakes. The corresponding seismic fragility curves were then drawn. Seismic fragility curves were also obtained under three different diameter ranges based on seismic damage statistics. Results showed that, under the same ground motion, with increasing service time and decreasing pipe diameter, the probabilities of three failure states, namely, basically intact, moderately damaged, and severely damaged, all increased.
Comparison and analysis of dry mixed mortar and traditional shotcrete and equipment development scheme
Authors: Li Xu , Zhu Hong li , Jing Wen qing , Cheng Guo qiang 
Published: February 2021

Abstract
In order to study the advantages and disadvantages of dry mixed mortar and traditional shotcreting in underground shotcreting operation, and improve the mechanization level of underground shotcreting operation. This paper makes a statistical analysis on the use of dry mixed mortar shotcreting machines in 10 pairs of mines, such as Fucun and Tianchen of Zaokuang group. It is found that the dust content in the feeding point and the shotcreting point is higher, and the rebound is also higher. Six pairs of coal mines, such as Fucun and Tianchen, were selected to compare and analyze the shotcreting efficiency, rebound rate, dust rate and economic and technical indicators between dry mixed mortar and traditional mortar. The results showed that compared with traditional mortar, the shotcreting efficiency of dry mixed mortar was increased by 55.1%, the work efficiency was increased by 97.9%, and the rebound rate was reduced by 4.8%. Based on the above problems existing in dry mixed mortar shotcreting operation, the joint scientific research institute of Zao mining group put forward the schemes of bag feeding of finished dry mixed mortar and centralized feeding of finished dry mixed mortar, as well as the new shotcreting machine JSPB-8LX which can automatically adjust the water cement ratio, laying a foundation for the comprehensive promotion and application of dry mixed mortar under the mine.
Glacial lake outburst caused by small amplitude wave overflow
Authors: Wang Baoliang , Wang Hongfei , Yao Zhenguo 
Published: February 2021

Abstract
In this study, a series of glacial lake dam overflow experiments are conducted. In those experiments, the influence of surge scale on dam outburst was studied. According to the results of the experiment, the surge overflow is the direct trigger factor of the natural lake outburst, and the periodic return of the small amplitude surge is favorable to the formation of the dam outburst. The scale of the surge will affect the time required to form the break, and the shape of the outburst flood curve. The scour movement of the water in the dam back side will make the dam form a gully. The scour movement of the water in the back side will make the dam form a gully, when the gully developed to a certain extent, the interaction between the water flow and the bottom bed changed from shear action (friction resistance) to impact action, which greatly increased the erosion and destruction capacity of the water flow and formed a "headcut". The water flow constantly brushes the bottom of the "headcut" and produced retrospective erosion, make the break constantly expanded, eventually result in dam break.
Green Development Path Analysis of Small Hydropower Based on River Chief System
Authors: Zhang Xinfeng , Li Zhaoxu , Jiang Ran 
Published: February 2021

Abstract
River chief system is an innovative river and lake management system and model with Chinese characteristics. At present, the river chief system has achieved remarkable results in the management and protection of rivers and lakes in various regions. To promote the green development of small hydropower stations under the river chief system is not only the internal requirement of protecting water ecological environment, but also the urgent need of small hydropower stations to adapt to the green development in the new era. Based on the current situation of small hydropower development, this study establishes the evaluation system of small hydropower cleaning and rectification, evaluates the main problems existing in the green development and ecological transformation of small hydropower, and puts forward a practical development path, in order to promote the small hydropower ecological problems rectification and gradually embarking on the road of green development.
Investigation of South Korea Precipitation Variation using Empirical Orthogonal Function (EOF) and Cyclostationary EOF
Authors: Sun Mingdong , Kim Gwangseob , Xu Xiangqin , Wang Yan 
Published: February 2021

Abstract
The monthly precipitation data of 56 stations during 47 years (1973-2019) in South Korea are comprehensively analysed using the EOF technique and CSEOF technique respectively. The main motivation for employing this technique in the present study is to investigate the physical processes associated with the evolution of the precipitation from observation data. The first mode account for 77.07% of the total variance and exhibits annual cycle of corresponding PC time series with traditional spatial pattern, and the second mode spatial patterns account for 8.13% of the total variance and show strong north to south gradient. In CSEOF analysis, two leading modes temporal pattern of PC time series reveals the annual cycle on a monthly time scale and long-term fluctuation, the first mode temporal pattern of PC time series account for 73.55% of the total variance and shows an increasing linear trend which represents that temporal variability of first mode pattern has been strengthened. The spatial distribution corresponding to two leading modes show monthly spatial variation. Compared with the EOF analysis, the CSEOF analysis preferably exhibits the spatial distribution and temporal evolution characteristics and variability of South Korea historical precipitation.
Development status and trend of water saving agriculture in China
Authors: Li Fuqiang , Wang Yucai , Zhang Hengjia 
Published: February 2021

Abstract
As an agricultural country, the shortage and waste of water resources seriously restrict the rapid development of agriculture in China, so how to realize water-saving agriculture is imminent. This paper expounds the current situation and existing problems of water-saving agriculture in China, studies and discusses the development trend of water-saving agriculture in the future, which provides a certain theoretical basis for the rapid development of China’s agriculture.
Effects of different irrigation quotas on growth characteristics and yield of seed maize in Hexi Corridor
Authors: Xiao Rang , He Zhibin , Zhang Yongling , Xiao Zhanwen , Cheng Hongyu , Liang Chao 
Published: February 2021

Abstract
In order to find out the optimal scheme of irrigation quota for seed corn in Zhangye, field experiments were carried out to study the effects of different irrigation quotas on the growth and yield of seed corn. Seed corn was used as test crop, drip irrigation under plastic film was used as water supply mode different irrigation quota treatment T1(4200m3/ha), T2(4650m3/ha), T3(5250m3/ha), T4(5400m3/ha), CK(5850m3/ha) were set up.The results showed that the plant height of T2 was the highest, reaching 154.6 cm,and the ear height of T4 was the highest, reaching 74.8cm.There was a significant difference in the double ear rate among different treatments, among which the double ear rate of T4 was the highest, reaching 19.12%, followed by T3(17.86%) and CK(15.12%), and the double ear rate of T1 was the lowest, reaching 12.98%. The empty stalk rate of T2 was the largest(7.72%), followed by T3 and T4, and the empty stalk rate of T5 was the smallest. The ear of T3 was the longest(14.74cm), and the invalid ear length of T4 was the largest(1.64cm). The grain number per ear of T4 was the largest, followed by T2, CK and T3, and CK was the smallest. Compared with T2 and T3, T4 increased by 0.23% and 4.32%(P>0.05), respectively, and significantly increased by 16.56% compared with T1.Different treatments have different responses to the yield of seed production. Among them, the T4 treatment has the largest yield, reaching 6655.8kg/hm2, followed by T2 and T3, which are 5853.6 and 5661.9kg/hm2, respectively.The T1 yield is the smallest, only 5362.2kg/hm2,T4,T2 increased by 24.12% and 9.15% respectively compared with CK, significant difference. Comprehensive consideration of agronomic traits, ear economic traits, crop yield and yield increase rate and other indicators show that the optimal irrigation quota for corn planting areas in the Hexi Corridor is 5400m3/ha The irrigation quotas for each growth period are 825m3/ha at the jointing stage, 825 m3/ha at the big bell mouth stage, 975m3/ha at the tasseling stage, 975 m3/ha at the flowering stage, 975m3/ha at the filling stage, and 825 m3 at the milking stage/ha. This research can provide theoretical and technical reference for realizing high-efficiency water-saving cultivation and industrialization development of maize seed production in the oasis irrigation area of the Hexi Corridor.
Mechanical properties of corroded stainless steel rebars under marine environment
Authors: Zhao Zi-Xiang , Gui Shi-Jie , Tang Peng , Wang Xiao-Hui 
Published: February 2021

Abstract
Under the marine environment, the durability of the reinforced concrete (RC) infrastructures is greatly influenced by the chloride-induced corrosion of the ordinary reinforcing bars. In order to prolong the service life of the RC infrastructures, stainless steel rebars (SSRs) are gradually used in marine infrastructures due to their better corrosion resistance. However, research on the corrosion and mechanical properties of the SSR under marine environmental attack is quite limited. In this paper, tensile tests at room temperature were carried out on corroded SSR samples with different types and diameters. Results show that, no obvious yielding plateaus can be observed in the stress-strain relation curves of the SSRs when compared with those of the ordinary carbon steel bars; the yielding strength and ultimate strength of the corroded ordinary carbon steel bars and SSRs decrease with the increased average cross-sectional loss while the elongation change of the corroded SSRs with the average cross-sectional loss is variable. Basing on the constitutive model of uncorroded SSR proposed by Ramberg and Osgood and considering the influence of the average and maximum cross-sectional loss on the strengths of corroded SSRs, stress-strain constitutive models of the corroded SSRs were proposed.
Research on Regional Planning of Trans-provincial Flood Control River
Authors: Piao Xitong 
Published: February 2021

Abstract
Aiming at the problem of the integrity of the regional flood control planning with the division of administrative boundaries in the coordinated development of the region, the typical inter-provincial basin of Beijing, Tianjin and Hebei is selected as the research object, and the numerical coupling model of flood control and drainage based on MIKE11, MIKEurban and MIKE21 is constructed to identify the regional problems of river flood control, to reveal the systemicity, linkage and synergy of flood control and drainage planning under the background of regional coordinated governance, and to explore the planning ideas for linkage planning of regional flood control and drainage projects.
Corrosion resistance of two types of stainless steel reinforcements under the simulated seawater wetting-drying cycle attack
Authors: Qi Lu-lu , Gui Shi-Jie , Tang Peng , Wang Xiao-Hui 
Published: February 2021

Abstract
In order to study the corrosion resistance of the stainless steel bars under marine environmental attack, simulated seawater drying and wetting test on the two types of the stainless steel bars (SSRs), 304 and 316L austenitic SSRs as well as S32304 and S32205 duplex SSRs, was carried out in the laboratory. Electrochemical monitoring of open-circuit potential, linear polarization and electrochemical impedance spectroscopy (EIS) was carried out via CS310H electrochemical potentiostat. Zview software was used to discuss the measured data. Results show that the Stern-Genry coefficient B of the ordinary carbon steel bar is about 20mV, while those values of the duplex SSRs and austenitic SSRs are in the range of 14∼16mV and 15∼17mV, respectively. For the above-listed reinforcement, better corrosion resistance is shown in the duplex SSRs with the best behaviour observed in S32304 duplex SSRs; the corrosion resistance of the austenitic SSRs 304 and 316L is good and similar, while poor corrosion resistance is shown in the ordinary carbon steel bar as expected.
Application Progress of Comprehensive Evaluation Model in Irrigation District Water-Saving Reform
Authors: Wang Zeyi , Wang Yingying , Zhang Hengjia 
Published: February 2021

Abstract
Water-saving reform in irrigated districts is of great significance to agricultural water-saving and production increase, and to promote economic development. Hence, a reasonable evaluation of the comprehensive benefits of irrigation district water-saving reform is conducive to the planning and management of the water, and to the modernization of irrigation districts. Through the collation of relevant literature, the necessity and feasibility of water-saving reform in irrigation districts were briefly described, and the application progress of different evaluation models in the benefit evaluation of water-saving reform in irrigation districts was clarified. The problems and development trends of benefit evaluation of water-saving reform in irrigation districts are put forward, and the benefit evaluation model widely used at present is described. Benefit evaluation has involved all aspects of human life, and its application fields have become wider and wider, and more and more methods have been adopted. Therefore, it is of great importance to summarize the evaluation methods and theories.
Research on a Method for Simulating Hydrodynamic Pressure of Two-way Water Retaining Thin Plate
Authors: Bi Zhonghui , Huang Weiyang , Yang Wenyun , Liu Fanghong 
Published: February 2021

Abstract
Under the action of an earthquake, the interaction between water bodies and solids is an important part of analyzing the stability of water retaining structures. This paper proposes the use of shell elements to simulate two-way water retaining thin plates, and the correctness of the method is verified by ANSYS fluid-solid coupling plate; then the new method is used to simulate the impact of the water on the thin plate under the action of earthquakes. Earthquake water pressure is used to analyze the seismic response law of the two-way water retaining plate. The research results show that: the hydrodynamic pressure of the two-way water-retaining sheet is greater than that of the one-way water-retaining, and is approximately equal to the sum of the dynamic pressures of the two-way water-retaining.
Research Status and Prospect of Fish Habitat
Authors: Liu Ya , Tong Sichen , Xiong Yongfeng 
Published: February 2021

AbstractThe impact of habitat changes on fish has become increasingly prominent, leading to the decline of fish population in varying degrees. Therefore, the study of fish habitat is an important means to protect fish resources. This article introduces the current status of fish habitat research at home and abroad. Overseas fish habitats are more comprehensive. Domestic fish habitat research mainly focuses on fish reproduction hydrology research, fish reproduction hydrodynamics research, and fish habitat suitability. The purpose of this study is to provide a systematic scientific basis for the protection of fish key habitats, and to protect the sustainable utilization of fish germplasm resources and the sustainable development of fisheries.
A Study of Water Quality Safety of Rural Water Supply Projects in the Pearl River Basin
Authors: Jiang Ran , Zhu Xiaoping , He Rui , Chang Ze 
Published: February 2021

Abstract
In order to know the water quality of rural water supply projects, the water samples are collected from finished water and tap water of administrative villages in some counties and districts of the Pearl River Basin for sampling inspection in 2019. The water quality indexes and limits in Table 1 and Table 4 are taken from Standards for Drinking Water Quality for evaluation. The detection results showed that the water quality of finished water and the water source area was completely up to the standard. For 71 water samples collected from the finished water of the water treatment factory detected, except for some parameters that slightly exceeded the limits, the rate of reaching the standard is up to 97.2%. It can thus be seen that the water quality safety of the rural water supply projects in the Pearl River Basin area is highly reliable.
Channel regulation engineering plan for Reach in Xijiang River
Authors: Li Shaoxi 
Published: February 2021

Abstract
In the reach from Jieshou to Ducheng of the Xijiang River, the flow and sediment conditions are complex, the shallows are linked together and the rocks are densely covered. With the promotion of waterway classification, the navigation-obstructing phenomenon appears in some shoal reaches due to insufficient depth. There are some safety hazards for ship navigation due to the distribution of rocks in channel or on both sides of channel. Based on the navigation-obstructing characteristic, the channel regulation principles mainly in dredging and rock blasting and secondly by damming were put forward. And according to the concrete condition of different shallow reaches, different channel regulation methods were proposed. By fixed and movable bed physical model test, the variations of the water level along the reach and the velocity in channel before and after different engineering plans were studied. The results show that the dredged channel will be stable and the water depth in channel will meet the demands of design depth after the recommended plan implementation.
Research and application of numerical simulation of ship maneuvering under non-uniform wind
Authors: Wang Chuanai , Tong Sichen , Diao Mingjun 
Published: February 2021

Abstract
Taking Fortran language as the platform, a depth-integrated two-dimensional non-uniform flow mathematical model and a ship maneuvering mathematical model were developed from the bottom layer. By further coupling the influence of wind, the mathematical model of ship maneuvering motion based on wind and current effects was constructed. Taking a typical river section in the Three Gorges Reservoir area as an example, the numerical simulation of ship maneuvering motion under still wind and non-uniform wind effect was carried out. Results show that the ships are obviously affected by wind in this river section. With the increasing change frequency of wind speed and direction, the difficulty of ship control increases correspondingly. In order to avoid the average accident, the ship must change its steer in time accordingly. This model can simulate the ship maneuvering motion and navigation status under wind effect quite well, which can provide some references for the ship’s navigation and maneuvering in inland rivers.
The characteristics of sediments in the middle and lower Yangtze River influenced by dam operation
Authors: Guo Anan , He Li 
Published: February 2021

Abstract
Since the Three Gorges Dam (TGD) was operated, the sediment characteristics in the downstream river have changed significantly. The characteristics of sediments can be partly reflected by the critical diameter to distinguish wash load and bed material load (WAB) and the ratio of wash load to suspended sediment (WTS). However, the WAB and WTS of the Yangtze River(YR) have not been fully investigated. In this study, data of sized suspended sediment and bed material at four stations in the middle and lower YR were collected to calculate the WAB and WTS, using the most-curvature method. The variations were then analyzed. The results suggest that the WAB and WTS of Yichang station varied greatly before the impoundment, while that of other stations were in small fluctuations. After the impoundment, the WAB of Yichang station increased dramatically to 1.856 mm, and the growth rate of the WAB at Jianli and Hankou stations were 1.0% and 4.1%, respectively (compared with WAB in 2002), while that of Datong station was -8.4%. Comparing with the rising WAB, the WTS of Yichang station continued to rise until it was close to 100%. However, the WTS of other stations decreased overall (30%-40% in Jianli and Hankou, and 8% in Datong).
Research and Calculation on the Optimization of Hydraulic Lifting Mechanism for New Steel Gate
Authors: Kaixuan Li , Yehan Geng , Zhan Wang , Yongsheng Yan 
Published: February 2021

Abstract
The steel gate based on the principle of hydraulic lifting mechanism has been widely used in urban water ecological construction, but the retaining height of this kind of gate is mostly l-5m at present. With the development of water conservancy engineering and the deepening of the application research of steel gate, the retaining height gradually grows to 6-8m. However, at present, there are few researches on hydraulic lifting mechanism in the case of large retaining height. In this paper, Inventor is used to firstly establish three-dimensional visual entity models of the direct push type, Booster type and Maleli type hydraulic lifting mechanism. Then, the changing rules and relations among hydraulic cylinder diameter, stroke and stability safety factor of the three hydraulic lifting mechanisms are calculated and analyzed by changing the constraint conditions in the case of large retaining height (4m, 5m, 6m, 7m, 8m) and different opening and closing angles. It is aimed at providing a scientific basis for the optimization of hydraulic lifting mechanism of steel gate under the condition of large retaining height.
Construction of risk diagnosis mode database for South to North Water Transfer Project
Authors: Zhou Ning , He Yongjun , Wang Fang , Li Hongen 
Published: February 2021

Abstract
There are complex and diverse engineering structures in the Middle Route Project of South to North Water Transfer. In order to ensure the normal operation of the project during the operation period. By analysing and summarizing the possible dangerous situations, it can effectively improve the emergency response ability of relevant management departments. In this paper, typical structures and risk databases are built based on the method of entity relationship graph. Using the related factors in the history risk databases, the engineering factors, environmental factors and human factors are sorted out to subdivide the entities. The relationship between risk factors and typical structures is carried out by risk codes, so as to build a complete engineering risk database.