bluuebunny/crossref_metadata_2025_split huggingface dataset:
Detection and Analysis of the Concentration of Radioactive Radon in the Construction Environment of a University
Authors: Chen Shuyi , Gong Jinghui , Wan Letao , Chen Jingxian , Dong Yuan , Yuan Yuan 
Published: November 2019

Abstract
Radioactive radon is an important hazard in indoor air environments. In order to study the concentration of radon in the building environment, this paper tests the content of cockroaches in a university dormitory, teaching building and auxiliary room through experiments. And the experimental results are analyzed. The results show that: In the built environment, the closer the soil is to the foundation, the higher the concentration of radioactive radon, and the effect of temperature and humidity on the concentration of radioactive radon is very small.
Research progress in polymerization methods of emulsion acrylic acid pressure sensitive adhesive
Authors: Zhang Hongyan , Wang Huiqin , Wang Haiquan 
Published: November 2019

Abstract
In this paper, the characteristics of pressure-sensitive adhesive, the properties of pressure-sensitive adhesive and the preparation of pressure-sensitive adhesive are introduced. The research progress of emulsion acrylic pressure-sensitive adhesive is the focus of this paper. The methods of producing this kind of pressure-sensitive adhesive and their advantages and disadvantages in recent years are summarized.
Establishment of Clean Energy Demand Forecasting Model in China Based on Genetic Algorithms
Authors: Chen Jiying , Cheng Gaoyuan , Chi Shuanghe 
Published: November 2019

Abstract
In the future, energy development will face a series of severe challenges, such as insufficient domestic conventional energy resources, huge oil supply gap, large amount of clean energy needed by cities, and huge international pressure on global climate change. This paper uses historical data and genetic algorithm to improve it, and uses function expansion model to reveal the internal proportional connection between energy consumption and economic development. By comparing the forecasting methods of clean energy demand, it is found that the energy consumption elasticity coefficient method is used to measure and predict the growth ratio of energy consumption, and the figure in the next few years is measured. The software has self-built optimization model, reflects energy supply and demand fluctuations, and generates reports. It can make decision support for regional clean energy system planning, miscalculation and clean energy demand forecasting.
Effects of Pig Manure Composts on Lettuces Quality and Nitrogen/Phosphorus Utilization Efficiency in Huang-Huai Plain
Authors: Liu Shasha , Li Bing , Zhang Gubin , Feng Xiang , Yang Po , Guo Lin , Li Zitao , Li Zhijuan , Sun Xiaodan 
Published: November 2019

Abstract
The prevailing problems in countryside, such as excessive use of chemical fertilizer and large amounts of livestock manure, need to be addressed urgently. In order to optimize the amount of applied organic fertilizer, the experiment was carried out in the planting-breeding combined circular agricultural area of Huang-Huai plain and the effects of pig manure fertilizer amounts on lettuces yields, quality and nitrate/phosphorus utilization efficiency were investigated. It was found that the replacement of chemical fertilizer with organic fertilizer had no significant effects on the N and P content of lettuces when treated with the same amounts of fertilizer. However, it could improve its yield, quality, and nitrogen/phosphorus utilization efficiency. When the ratio of organic fertilizer replacement was 25%∼75%, the nitrate and nitrite content of lettuces were reduced by 19.41% and 73.33% compared with the chemical fertilizer treatment. The nitrogen and phosphorus utilization efficiency in the 75% organic fertilizer replacement were highest, which were 30.4%/44.9% higher than that of chemical fertilizer respectively. Above all, the 75% organic fertilizer with 25% fertilizer group had the best effect on the yield of lettuces, improving the quality and utilization efficiency of nitrogen and phosphorus fertilizer. The results could provide an important scientific basis for determination of regional vegetable planting fertilizer and reduce the non-point source pollution risk.
Assessment of urban land cover change base on Landsat satellite data: A case study from Hanoi, Vietnam
Authors: Tran Ducthien , Xu Dawei , Liu Bingxi 
Published: November 2019

Abstract
Rapid urbanization process is accelerating the dramatic transformation of urban land cover, creating strong economic, social and environmental impacts. Many studies have achieved significant achievements in the application of Landsat satellite data to assess the land cover change. Remote sensing images of contain the necessary spectral and spatial features of the various objects. The Normalized Difference Vegetation Index (NDVI) is utilized to analyze remote sensing images of landsat satellite data and is one of the most widely used numerical indicator for calculating the visible (VIS) and near-infrared bands (NIR) of the electromagnetic spectrum. In this study, the NDVI based classification has indicated about significant change in land cover in Hanoi, Vietnam from 2001 to 2017. The study results show that a major change has been found in the vegetation cover area where about 56 km2 (accounts for 12.3%) area has been lost during the period from 2001 to 2017. This study demonstrates the importance of considering land cover change to improve the quality and optimizing the model of land use in urban areas.
Comparison of spatial interpolation methods for mercury content in soil of contaminated farmland in Tongren
Authors: Song Xuelian , Ruan Xirui , Zhang Wen , Zhang Hua , Huang Guopei , Wang Zhiwei , Zhong Li , Wang Puchang 
Published: November 2019

Abstract
Taking mercury-contaminated farmland in Tongren city, Guizhou province as study area, we conducted five interpolation methods, including inverse distance weight, radial basis function, global polynomial, local polynomial and kriging, for the collected soil mercury content data. The interpolation results were evaluated by cross validation. The results indicated that the five methods can accurately reflect the spatial distribution characteristics of the study area and the interpolation effect and precision of kriging method are optimal. In kriging method, the accuracy of removing second-order trends is highest, and the interpolation effect of exponential model is the best. The variation function model of kriging method shows that soil mercury content in this region is mainly affected by natural factors, but less affected by random factors.
Study on Environmental Effects of Different Covering Measures on Spring Maize Planting in the Loess Plateau
Authors: Zhang Ruiqing 
Published: November 2019

Abstract
Covering farming techniques is an effective means of protecting and managing soils in arid, semi-arid and sub-humid and drought-prone areas, and is a change to traditional farming systems. This technology can regulate the “water, fertilizer, gas, heat” of farmland soil, change the physical and chemical properties and environmental quality of soil in arid areas, and effectively solve a series of problems caused by drought and irrational farming. Through different farming cover measures, In order to achieve stable production and high yield, it has important promotion value in the loess area. Through comprehensive research on the relevant research and demonstration experience of predecessors, this paper deeply studies the growth and development of spring maize and soil water and fertilizer effects under different cropping practices. It is found that different coverage measures have significant gain effects on soil moisture and fertility. The increase in corn production has a positive effect.
Explicit dynamic analysis of coal gangue particles impacting the metal plate
Authors: Bo Chen , Yang Yang , Xin Zhengyuan 
Published: November 2019

Abstract
To study the stress and strain of the tail beam and the change of the movement state when coal gangue particles impact the tail beam of the hydraulic support, coupled with the differences of impact results between coal rocks with different materials, this paper uses the method of joint simulation by Hypermesh and Workbench. Firstly, using the software Hypermesh to pre-process the impact model, and then importing the grid file into the finite element analysis software workbench. Finally, using the Explicit Dynamic module of Workbench to simulate and analyze the impact behavior of different coal gangue particles. The results show that, compared with gangue, the stress and strain, as well as the dynamic response of the metal plate caused by coal is smaller. This study can provide a reference for the study of dynamic characteristics of hydraulic support, and a research basis for the realization of coal gangue vibration identification method.
Study on Iterative Method of Nonlinear Finite Element Analysis for High Arch Dam
Authors: Wang Zhiqiang , Niu Jingtai 
Published: November 2019

Abstract
The nonlinear FEM can simulate the real working behavior of arch dam, but its result is related to iterative method and convergence control standard. This paper proposes iteration convergence criterion based on two iterative methods of Newton iterative method and modified Newton iterative method. Taking Xiluodu arch dam as an example, the article has conducted research to the problems above, thus obtaining some beneficial conclusions.
Direct Shear Test of Silty Clay Based on Corrected Calculating Model
Authors: Sun Zhaohui , Bian Hanbing , Wang Chenyu , Zhang Saize , Qiu Xiumei 
Published: November 2019

Abstract
Direct shear test is one of the common method to study the parameters of shear strength and shear strength of soil. However, the current standard of geotechnical test method does not consider the calculation error caused by the change of shear area during shear process. In this paper, the direct shear test corrected calculation model considering effective shear area is established. This model shows that the test values of shear stress and normal stress are lower than the corrected values with the decrease of effective shear area, and the errors between them will increase with the increase of relative shear displacement. The analysis of the direct shear test results of silty clay shows that the errors between the test and corrected shear stress values are also related to the normal stress. The errors will increase with the increase of the normal stress. The shear strength parameters after correction tends to decrease. The effect of the corrected model on the cohesion is more significant than internal friction angle, and the effect on internal friction angle can be neglected approximately. On the basis of Mohr-Coulomb criterion, a shear strength criterion based on the corrected calculation model is established, which can be used to calculate the true shear strength parameters more accurately.
Research on perfermance improvement of constructed wetland wastewater treatment system
Authors: Mao Yuting , Huang Haiqin 
Published: November 2019

Abstract
Constructed wetland is a kind of wastewater ecological treatment technology. It has the advantages of low investment, convenient operation and management, stable water quality, and has certain landscape effects. Therefore, it is widely used in the field of wastewater treatment. However, this technology still has certain problems in practical engineering applications, such as irregular design and clogging, resulting in limited service life and processing performance of the wetland. The type selection of constructed wetlands, matrix type and particle size, plant type and configuration, and water inflow mode and operating parameters are the main factors affecting the operating life and purification effect of constructed wetlands. Based on the author’s practice, the article introduces in detail the current process structure, basic design methods and economic and technical comparison of constructed wetland wastewater treatment for reference by relevant scientific research and design units.
Effect of Different Tillage Managements on Soil Physicochemical Properties and Crop Yield
Authors: Liu Zhe , Lei Na 
Published: November 2019

Abstract
In order to explore the effects of different tillage managements on soil physical-chemical properties and crop yield in Tangyu town, Meixian County of Shaanxi Province, the soil physical-chemical properties and crop yield were analyzed. The study was conducted at the Qinling Field Monitoring Center Station in early September 2017, which included three tillage managements: no tillage (NT), mouldboard plow tillage (MT) and soil subsoiling tillage (ST), the soil organic matter, total nitrogen, ammonium nitrogen, available potassium, soil temperature and maize grain number per ear and yield in the project area were measured. The results showed that the NT and ST managements could better buffer and maintain the change of soil temperature, reduced soil pH value compared with MT management. NT and ST managements were helpful to increase the content of total nitrogen, organic matter, ammonium nitrogen and available potassium, soil organic matter(SOM) content under NT and ST managements was 49.6% and 31.7% more than that under MT management in the 0–10 cm soil layer, The order of total nitrogen content was ST>NT>MT, and available potassium content was NT> ST>MT in the 0–30 cm soil layer, there was no obvious difference between NT and ST managements in improving soil nutrients. Meanwhile, NT and ST managements increased maize grain number per ear and yield. Thus, it was recommended to use NT and ST managements to improve soil quality and increase crop yield, and was suitable for sustainable agricultural development.
Ecological Footprint Evaluation Model of Petrochemical Industry Based on Energy Theory
Authors: Zhao Yu , Bai Xiaoqian 
Published: November 2019

Abstract
This paper establishes an ecological footprint model based on energy theory to calculate the ecological footprint of petrochemical industry. The results show that the industrial structure of petrochemical industry is single and the ecological environment is seriously damaged. The economic and social benefits created cannot compensate for the ecological environment cost of industrial development.
Distribution of Soil Nutrients in Loess Hilly and Gully Area
Authors: Ya Hu , Lu Zhang , Jie Cheng , Jing Wei 
Published: November 2019

Abstract
To understand the spatial distribution characteristics of soil nutrients after reclaiming the land in the loess hilly and gully region. We collected the soil profile data of 2m soil layer from the end of the ditch to the head of the ditch. The results showed that: (1) The average available phosphorus, available potassium and organic matter content of the soil in the gully area of the loess hilly and gully region were at a low level. The content of average available phosphorus and organic matter decreased first and then increased with the increase of soil depth. The content of average available potassium decreased with the depth deepening. The gully soil was alkaline and the pH value along with the soil depth. The increase is gradually increasing. (2) The content of available phosphorus gradually decreased, and the content of available potassium and pH value gradually increased. The spatial distribution characteristics of organic matter are similar to the spatial distribution of available phosphorus, and the content of available phosphorus is enriched below the trough end to the middle of the gully.
Research on the Water Diversion Ratio Characteristics of the Plain River Network--A Case Study of the Channel in Zhangjiagang
Authors: Wang Ziyue , Li Yiping , Weng Shenglin , Zhang Jinglin , Hu Tan 
Published: November 2019

Abstract
This study combined numerical simulation with field observation, and this study took the classical bifurcated river of Zhangjiagang as an example and built a two- dimensional hydrodynamic model of the river course upon it. In addition, this project studied the influencing factors and the mechanism of the flow diversion ratio in the plain river network and established a formula to estimate the flow diversion ratios in plain river networks with ridge regression. The results show that: (1) the water diversion ratio in plain rivers has a positive correlation with the roughness, the ratio of the width of the tributary to that of the main channel and the water level differences. The water diversion ratio has a negative correlation with the mainstream discharge. (2)The mainstream discharge and the ratio of the width of a tributary to that of the main channel are two dominant factors ofthe flow diversion ratio.(3)By establishing an equation for the water diversion ratio, the water diversion ratio in the plain river network can be predicted.
Calculation of Internal Force and Deformation of Overlying Soil Corrugated Arch Bridge Based on Plate and Shell Theory
Authors: Zhao Ruipeng 
Published: November 2019

Abstract
The shell is the general name for the flat plate and the shell. The mechanics of the plate and shell are similar to those of the elastic mechanics. The differential plate element is taken at any point in the plate or shell. From the perspectives of statics, geometry and physics, the equilibrium differential equations and geometric equations corresponding to the plate or shell are derived. And physical equations, these equations reflect the relationship and constraints between internal and external forces, strain and displacement, strain and stress. Under certain boundary conditions, the unknowns are determined by the above related basic equations.
Combined Application of Multiple Support Forms in Design of Large Deep Foundation Pits
Authors: Hu Qi , Xie Jiawen , Fang Huajian , Lou Zefeng , Zhu Xiang , Huang Xingdi 
Published: November 2019

Abstract
With the constant exploitation of underground space, the single support pattern is not able to meet the needs of the foundation ditch design. This paper is based on a design case of the large-deep foundation ditch in Hangzhou and took the different geological environment requirements into consideration. In this paper our research team put forward the composite design of support pattern which adopts steel support, bored grouting pipe, soil nailed wall etc. We hope this paper can provide suggestions and references for other analogous projects.
Research on Interaction of Pile - Anchor Retaining Structure and Proposed Pile-Raft Foundation
Authors: Liu Zeyong , He Shaoheng , Shang Yuequan , Sun Hongyue 
Published: November 2019

Abstract
During the excavation of the foundation pit, the interaction between the foundation pile anchor support structure and the proposed pile group raft foundation will affect the passive earth pressure of the support pile and the foundation pit uplift. In this paper, the finite element software ABAQUS was used to establish a foundation pit excavation model for two foundation pits with and without group piles. Through comparative analysis, the interaction between the pile-anchor support structure and the pile-slab foundation will affect the passive earth pressure of the supporting structure. As the depth of excavation increases, the earth pressure in the passive zone of the supporting structure gradually increases. Results have shown that the variation of the spacing between the pile foundation and the supporting structure will have a greater impact on the passive earth pressure. The research results in this paper summarize the experience of foundation pit construction and provide a numerical theoretical basis for the construction of similar deep foundation pits, which is of great significance for optimizing the design and construction of deep foundation pits.
A Review and Expectation on Land Engineering Reclamation Research--Using Bibliometric Method Based on Web of Science
Authors: Sun Yingying , Ling Li , He Lirong 
Published: November 2019

Abstract
To verify the international development of land engineering reclamation research, so as to provide data analysis result for the researchers, keywords included in the meaning of land engineering were selected, and related articles on web of science between 1980 and 2016 were reviewed. The results concluded that: 955 articles on land reclamation engineering from 99 countries were published from 1980 to 2016, annual trend of articles was in line with the law of linear. Articles from countries included China, America, England, Spanish made the strongest influence, and University of Chinese Academy of Sciences published the most articles. There is a growing concern on engineering reclamation research all over the world. Further researches on ecology and environmental sciences, agriculture, biodiversity protection, engineering science, business economics will be taken in the future.
Environmental problems in the mining of metal minerals
Authors: Luo Yuhu 
Published: November 2019

Abstract
During the mining of mineral resources, it will inevitably cause problems in the mine environment. According to the different ways of expressing environmental problems in mines, they can be divided into three categories: geological disasters, environmental damage and environmental pollution. Among the three mine environmental problems, environmental pollution has characteristics such as concealment, post-hazard hysteresis, watershed diffusion and accumulation, which cause serious damage to the mine environment. This paper focuses on the current status of environmental pollution problems in metal mining.
Differences in properties of long-term planting of different formulated soils
Authors: Lu Yangjie , Guo Zhen , Wang Yike , Cao Tingting 
Published: November 2019

Abstract
The characteristics of soil organic carbon, polysaccharides and calcium carbonate content in different proportions of compound soil were studied in the compound soil of arsenic rock zone and sand with rotation for 2 years, and the ripening of the mixed soil of arsenic rock zone and sand in different proportions was revealed. The results showed that the ratio of easily oxidized organic carbon in the 1:2 ratio of arsenic rock zone to sand is the highest in total organic carbon, the activity of organic carbon is the highest. And the content of polysaccharides and calcium carbonate in soil is higher, the water-soluble aggregates in soil were better developed.
Study on composite solid alkali-activated slag/fly ash concrete
Authors: Zhou Jianmei 
Published: November 2019

Abstract
Through FTIR, SEM/EDS and XRD analysis of hydration products of slag/fly ash concrete paste activated by composite solid alkali, the activation effect of composite solid alkali activator on slag/fly ash system was studied. The results show that the hydration products of the excitation system are mainly C-S-H gels, and the crystallization of C-S-H gels with 28 days hydration age tends to be perfect. The hydration products have good bonding and compact structure, which greatly improves the strength of the matrix. The damage pictures of 28-day-old C30 concrete blocks after compression test further show that the composite solid alkali activator has a good activation effect on slag/fly ash system.