bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fabrication of CdS/ZnS/g-C3N4 Composites for Enhanced Visible-Light Photocatalytic Degradation Performance
Authors: Liu Huan , Li Ping , Duo Shuwang 
Published: April 2021

Abstract
Constructing a heterojunction is an ideal way to modify the photocatalytic efficiency of semiconductor photocatalysts. In this paper, CdS/ZnS/g-C3N4 (CZG) ternary composites with different mass ratio of CdS (10%, 20%, 30%) were prepared by cation exchange method using as-synthesized ZnS/g-C3N4 and Cd(NO3)2·6 H2O as the starting materials. The composition and optical properties were investigated by XRD and photoluminescence spectra (PL). The results showed the ternary heterojunctions possessed faster photo-induced electrons/holes separation efficiency. The photocatalytic experiments exhibited that the obtained ternary composite materials exhibited enhanced visible-light photodegradation efficiency for the degradation of MO aqueous solution. Among the ternary composite materials, the CZG-10% composite displayed the highest photocatalytic performance of 68.52%. The enhanced photodegradation efficiency could be ascribed to the reasonable design of the heterojunction.
Electric Shock Analysis Based on AHP-DEMATEL Model in High-Voltage Switch Room
Authors: Gao Song , Jin Fuguo , Zhang Yuanbo , Yao Xiwen , Pei Xinyue 
Published: April 2021

Abstract
Electric shock accident in high-voltage switch room based on AHP-DEMATEL was anaylzed. In order to solve the problem that the AHP method is too subjective and lacks the consideration of the indirect influence between events, the AHP-DEMATEL method is constructed by introducing the comprehensive weight in combination with DEMATEL. Taking the electric shock accident in high-voltage distribution room as an example, 16 accident causing factors were identified firstly, then the weight of each factor was calculated by AHP method, and the interaction between the factors was analyzed by DEMATEL method. Finally, the AHP-DEMATEL method is used to obtain the causation factors, and the comprehensive weight under indirect influence is considered. It is concluded that leakage protection failure, operating tool insulation damage and illegal live working are the important causation factors of the accidents, which provide help for the distribution of high voltage electric shock accident prevention.
One-Dimensional Consolidation Analysis Considering Non-Darcian Flow and Self-Weight Based on Continuous Drainage Boundary
Authors: Zong Mengfan , Yang Xiaoyan , Wu Wenbin 
Published: April 2021

Abstract
The one-dimensional consolidation problem of soft soil with self-weight and non-Darcian flow is studied by introducing continuous drainage boundary. A numerical solution is derived by using finite difference method and its correctness is proved by comparing with existing analytical and numerical solutions. Based on the present solution, the consolidation behavior of soil is detailedly analyzed by adjusting the different parameters. The results show that, the soil consolidation rate increases with the increase of interface parameters or external loading rate. The difference between the average consolidation degree obtained by the solution with continuous drainage boundary and that with traditional boundary is mainly in the early stage of consolidation, but in the late stage of consolidation, the difference between these two solutions becomes smaller. Compared with the soil consolidation solution considers non-Darcian flow, the soil consolidation rate with Darcy flow is faster.
Laboratory Model Test on Moisture-Heat and Deformation Behaviour of Red Clay Slope under Action of Rainfall and Sunlight
Authors: Chen Ming , Liu Jian , Xie Zhengyong , Hu Xunjian , Li Bingyang , Cen Yue 
Published: April 2021

Abstract
Taking the red clay of Guizhou as the test material, the moisture-heat and deformation behaviour of red clay slope under action of rainfall and illumination were studied by constructing model slopes, observation systems, artificial rainfall systems and sunlight systems. The results showed that the volume moisture content decreased continuously during the sunlight period and decreased slowly after 5 days of sunlight, but it increased sharply during the rainfall period and the increments decreased with the increase in depth. The volume moisture content of the slope crest had almost the same increments after each rainfall; the volume moisture content of the slope surface increased slightly after the first rainfall, and then increased significantly thereafter; and the volume moisture content of the slope toe increased significantly after the first rainfall, and then increased slightly. The migration of water and heat in the soil showed a strong coupling. In other words, the temperature change could indirectly reflect the volume moisture content change, and the volume moisture content change would promote the redistribution of temperature. The depth effected by everyday sunlight and rainfall on temperature were both less than 42cm. Rainfall mainly affected the horizontal displacement of the shallow soil of the slope, and the horizontal displacement of slope toe is the largest, followed by slope surface and the smallest at the slope crest.
The Application of 3D Laser Scanning and Unmanned Ship Sounding in the Reexamination of Reservoir Storage Capacity
Authors: Pei Jiangrong , Yao Chenglin , Deng Zhongjun , Ren Zhiming , Yang Yubo 
Published: April 2021

Abstract
In order to accurately measure the reservoir capacity after siltation, this paper uses the ground 3D laser scanning system to obtain the topography above the water surface and the unmanned ship sounding system to obtain the topography below the water surface. then carry out the accurate review of the reservoir capacity through the combination model of water and underwater. The blind area of measurement is caused by the change of water level and detection conditions, which leads to measurement error. combined with the measured data of surface and underwater topography, the complete reservoir water level-area curve is obtained by water level-area fitting and contour interpolation fitting respectively, the error caused by blind area is minimized, and finally the reservoir capacity review is carried out according to the contour volume method. Practice has proved that the use of contour interpolation fitting method can greatly improve the credibility of the reservoir capacity review results, provide accurate and reliable basic data for reservoir management units, and provide support for reservoir flood control and operation.
Study on Difference of Permeability Coefficient Obtained by Hydrogeological Test in Ground Fissure Zone
Authors: Meng Hongte , Li Xinsheng , Liu Hanlu , Shen Zhengyang 
Published: April 2021

Abstract
In order to study the reason of different permeability coefficient obtained by pumping test and water injection test, based on the field test of ground fissures in Xi’an City, this paper analyzed the reasons that affect the results of the two tests by means of chart analysis and curve fitting. At the same time, the reasons for the different permeability coefficients of the upper and lower walls of ground fissures are analyzed. The results show that the permeability coefficient has a linear relationship with flow rate and drawdown. The permeability coefficient increases with the increase of discharge and decreases with the increase of drawdown. This phenomenon is related to the changes of capillary water and bound water. The difference of permeability coefficient between the upper and lower walls of ground fissures is also related to the content difference of bound water and capillary water.
Frost-Heave Deformation and Prevention Technology of Power Transmission and Transformation Foundation under Extreme Boundary Temperature
Authors: Wang Shijun , Jiang Mingjun , Xu Bo 
Published: April 2021

Abstract
Freezing and thawing disasters in seasonal frozen soil areas seriously affect the safety of power transmission and transformation projects. Studying the distribution of soil temperature and deformation under thermal insulation foundations is an important basis for the analysis of foundation stability in seasonal frozen soil areas. The thermal protection structure is closely related to the thickness of the insulation layer and the external thermal field. This dissertation takes the typical tower foundation of the 750 kV Hexi Power Grid Project and the geological conditions of the Shule River area in Gansu as the research objects. The theoretical analysis and numerical simulation methods are used to consider the impact of different thermal protection structures on the tower foundation and surrounding soil under extreme boundary temperatures. The influence of body deformation, stress, and temperature changes was analyzed. Through comparative analysis, it is found that the optimized structural form can effectively increase the temperature of the soil in extreme environments, avoid frost heave, and meet the design requirements for bearing capacity. In addition, the thermal-mechanical coupling analysis of the foundations of the initial temperature fields of different boundaries is carried out, and the applicability of the insulation foundation under different boundary conditions is discussed.
Feasibility Analysis of Freezing Method in Strong Permeability Strata
Authors: Zhang Chaochao , Li Dongwei , Wang Zecheng , Yang Jie , Liu Shengli 
Published: April 2021

Abstract
If the underground engineering meets the strong permeable strata, such as sand and pebble strata, it will face huge challenges. Effective sealing of water has become a prerequisite for determining the safety of the project. Freezing method is currently an effective method for dealing with complex permeable strata, however, the influence of the groundwater velocity on the freezing engineering is huge. If the groundwater flow rate is too high, the freezing cannot be completed normally. Therefore, for the freezing project of strong permeable formation, the speed and flow direction of groundwater is a focus of our research. The connecting channel at the bottom of the river of Fuzhou Metro is planned to be constructed by freezing method. The main soil layers are the strong permeable strata represented by the coarse medium sand layer and the pebble layer. Therefore, the measurement of the velocity and direction of the groundwater at the bottom of the river was carried out, and the influence of the groundwater on the freezing project was judged based on the measurement results. If the groundwater velocity is too high, normal freezing cannot be achieved. Referring to the form of the cofferdam, a composite reinforcement method is proposed.
Eco-Environmental Effects of Industrial Cities Based on Remote Sensing Images: A Case Study of Shenyang, China
Authors: Tang Yu , Shi Tiemao , Ma Fusheng 
Published: April 2021

Abstract
With Landsat remote sensing image and GIS spatial analysis method, the ecological environment of the built-up urban area in the third ring of Shenyang was studied, which was an industrial city. The LST and NDVI were extracted to analyze the urban spatial patterns and the relationship with urban land use types. The results showed that LST and NDVI were negatively correlated in urban ecosystem. The urban surface temperature and vegetation index of different land use types were significantly different. On the scale of 1 km, LST was weakly positively correlated with SHDI, while NDVI was negatively correlated with SHDI; LST increased with the increase of land use type diversity, while NDVI decreased with the increase of land use type diversity.
An Experimental and Computer Simulation Study of Tailing Flow Attributed to A Dam Breach
Authors: Luo Changtai 
Published: April 2021

AbstractThe tailing flow generated after dam failure will evolve into Geo-hazards like debris flows. Therefore, it is of great significance to study the evolution and influence range of tailing flow for disaster prevention and mitigation. Physical model experiments and numerical calculation are two major methods in Dam-failure research. These two methods can verify and complement each other, because the former can modify parameters of the latter and the latter can expand the research scope. In this study, a proposed tailing dam was simulated and calculated by using physical model experiment and simulation (Ramms). The erosion process of the dam body of the tailing flow was monitored by the model experiments. The numerical calculation parameters were adjusted to make the results closer to the actual conditions. This study aim to verify the reliability and effectiveness of the debris flow Ramms based on Voellmy model in dam failure simulation. The experiment showed that the velocity (Vmax =38.3 m/s), submerge area (Smax=0.558 km2) and the deposition depth (Hmax=36 m) of the tailing flow. It reflected that the Voellmy model can predict the flow state of tailing flow in the physical model experiments. So it can provide theoretical support and technical reference for the design and management of tailing dam.
Characteristics and Exploration of the Geomorphological Evolution of Lingdingyang Estuary in Recent Decades
Authors: Yang Liuzhu , Yu Fenghua , Liu Chaoqun , Liu Shuang , Pan Hongzhou 
Published: April 2021

Abstract
Based on the underwater topographic data of Lingdingyang since 1970s, the new characteristics of the evolution of the swale in Lingdingyang estuarine bay were analysed and the causes of the evolution were discussed. The results indicated that the West Shoal silts eastward and southward, and its spreading speed gradually slows down after 1985. Area in the north of the West Shoal decreases gradually and the in the south of the West Shoal the shoal area increases gradually. Recently, in the north of the Middle Shoal scour occurred, while in the south silt is the primary evolution. The - 5m contour line of East Shoal has little variation, and the swale surface area is also decrease gradually. The average annual erosion and deposition of the East, Middle and West Shoals of Lingdingyang has a certain correlation with the annual average sediment discharge of the main hydrological stations upstream. The correlation of the West Shoal is the best, Due to the high intensity of reclamation, the channels of in the west of Lingdingyang extends significantly to the sea. The runoff channels in the West moves downward, and the sedimentation center of the West Shoal tends to moves southward.
Study on Optimization of Shallow Section Coal Pillar Width of Gently Inclined Medium-Thickness Coal Seam
Authors: Li Feng , Zhang Zhipei 
Published: April 2021

Abstract
This paper takes a coal mine gently inclined medium-thickness coal seam as the object. Firstly, the principal stress characteristics and displacement characteristics of roadway surrounding rocks after roadway driving along goaf under section columns with different breadthes were analyzed by simulation method, and the roadway stability was evaluated to determine the reasonable breadth. The results show that when the breadth of column is 4 m, the Mohr stress circle of the pillar intersects the strength envelope and the roof and side displacement of roadway are significant; when the breadth is 6 m, the Mohr stress circle on both flanks of the pillar intersects at the strength envelope and the roof and side displacement of roadway are significant; when the breadth is 8-12 m, the Mohr stress circle of surrounding rock is separated from the strength envelope and the surrounding rock displacement meets the production needs. Therefore, it is in a stable state. 8-12 m is the reasonable width range of coal pillar. Secondly, through the actual project verification, the 8 m wide coal pillar is the most reasonable for the shallow part of the gently inclined medium-thickness coal seam.
Effect of Confining Pressure and Time on the Permeability of Saturated Remodeled Loess
Authors: Dong Qi , Niu Bo , Jian Liao Hong , Qi He Yu , Dai Qian 
Published: April 2021

Abstract
The permeability of saturated remodeled loess is closely related to slope engineering and digging-filling engineering. In order to explore the permeability of saturated remodeled loess, a list of triaxial permeability test is conducted on compacted loess under different confining pressures. The results show that the permeability coefficient of saturated remodeled loess decreases with the increase of permeability time, and finally stabilizes. The variation of confining pressure in the range of low and high confining pressures greatly affects the permeability coefficient of loess. A model considering the relationship between permeability coefficient and confining pressure is given, and applied to predict the permeability coefficient of loess under different confining pressures.
Geoecological Approach to Justification of Priority Directions for Reducing Negative Ecological Impacts during Implementation on the South Yakutia of Large Energy Projects in the Republic of Sakha (Yakutia)
Authors: Nikolaeva N A 
Published: April 2021

Abstract
The Republic of Sakha (Yakutia) belongs to the zone of the North, rich in natural resources. Distinctive features from other territories are extremely severe climatic conditions, unfavorable both for the population and for the intensive development of industry, construction, transport, and agriculture. Under current economic conditions it is necessary to intensify the development of fuel and energy resources as well as their export which leads to the peaking of environmental problems including environmental pollution. The most significant contribution to this process is made by the fuel and energy complex which determines the urgency of carrying out theoretical developments to minimize the consequences of disturbing the ecological balance of territories of industrial development. This requires a comprehensive geoecological approach involving a systematic study of the relationships between both natural and man-made objects, elements and processes necessary for the most complete analysis of possible changes in nature and their consequences. Based on the application of the geoecological approach, a methodological scheme has been developed that provides a comprehensive study of various fuel and energy complex objects as part of the complex, functionally unified geotechnical system “Energy Object - Environment” in the North which is based on geosystem analysis and the concept of geotechnical systems. Studying the interaction of large power facilities in South Yakutia – the Neryungri TPP, the Elga coal complex and the project of the possible Kankun HPP with the environment as a part of various industrial geotechnical systems, analysis and assessment of technogenic impacts, changes in natural complexes and natural and social consequences, assessment of the degree of environmental stability to technological impacts can form the basis for the development of geoecological directions, differentiated by landscape complexes and ranked by the levels of nature conservation. With that the specific activities are determined by the landscape and ecological specifics of each landscape area and modern regional nature management.
The Influence of Solar Activity Rhythms on Precipitation Cycles during Climate Change in Central Yakutia
Authors: Pomortseva A A , Pomortsev O A , Popov V F , Trofimtsev Yu I 
Published: April 2021

Abstract
The study of global climate warming remains open the questions about predicting process patterns and the used methods. The impact of solar activityon the Earth natural processes is being studied. The revealed features of solar activity fluctuations are consequences of the physics of the phenomenon itself, as well as delays in reactions to fluctuations in various geophysical layers of the Earth. Eleven-year cycles of precipitation dynamics observed at the Yakutsk meteorological station in comparison with solar activity cycles are described. The total number of cycles, according to the weather station, for the period from 1934 to 2018 is eleven. They are compared to eight solar activity cycles. A wavelet transformation of a series of atmospheric precipitation reveals the relationship between precipitation and solar oscillations. Even and odd precipitation cycles are highlighted, in line with Hal’s law of magnetic polarity. Positive precipitation anomalies have been found to be consistent with the maximums of odd-numbered solar cycles and the minimums of even-numbered cycles, while negative anomalies are found to be consistent with the minimums of odd-numbered and maximums of even-numbered cycles. Highlighting cyclic components can be useful in studying changes in humidity due to climate perturbations. The obtained results can be used to make climate and hydrological forecasts for the central region of Yakutia.
Rain Precipitation Parameters for the Design of Surface Effluent Treatment Facilities from the Territory of Industrial Enterprises
Authors: Palagin E D , Strelkov A K , Pavluhin A A 
Published: April 2021

Abstract
Data on the maximum layer of precipitation for rain, the drain from which is allocated to treatment facilities from the territories of industrial enterprises in the conditions of the Russian Federation, are presented. The results are analysed and summarized. The average layer of precipitation with a period of single excess equal to 1 year according to 195 weather stations is determined. The average precipitation layer for the entire area under consideration was 27.8 mm, with a variation range of 12.3 to 72.0 mm. The obtained parameters are intended and can be used for design of surface runoff treatment facilities.
Numerical Simulation of the Working Bodies of the Machine for Removing the Tops of Vegetable Crops
Authors: Frolov D I , Kurochkin A A 
Published: April 2021

Abstract
This article is devoted to the analysis of the kinematic and aerodynamic characteristics of the model of the working bodies of the haulm topper. The problem of removal of lodged tops of vegetable crops was investigated on the basis of finite element analysis of the model. Obtaining data on the density and air flow rates inside the casing of the topper is an urgent task. The aim of the work was to analyze the air flow rates and air pressure during the operation of the topper. The Solidworks FlowSimulation package was used to build and simulate a numerical model of the working bodies. Numerical modeling of the haulm-removing organ obtained maps of the distribution of velocities and pressures in the cutting zone of the haulm. Average values of air flow velocity (12-30 m/s) and pressures inside the casing (1.5-2 kPa) ensure the rise of the haulm to the cutting zone of the knives.
Results of Environmental Monitoring of the Natural Environment of the License Area of Oil and Gas Production in the North of Western Siberia
Authors: Burlaenko V 
Published: April 2021

Abstract
This paper presents data of the local environmental monitoring carried out for environmental components within the license oil and gas production area located in Tazovskiy Raion, Yamalo-Nenets Autonomous Okrug, Tiumen Oblast. The local environmental monitoring of the license area includes analyses of all environmental components: atmospheric air (snow cover), soils, surface water, and bottom deposits. According to the analysis of data obtained in 2006-2018, regulatory limits and average regional values established for contents of hazardous substances in the soil profile were exceeded. Besides, MAC values in surface water were exceeded.