bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on soil erosion Simulation in Tianshui Maiji district based on InVEST-SDR model with GIS and RS
Authors: Zhu Xiaoyan , Zhang Renzhi 
Published: December 2019

Abstract
The Maiji district of Tianshui city locates in the transition regions of semi-arid and semi-humid with fragile ecosystems, so it is of great scientific and practical significance to analyse and study its characteristics and influencing factors of soil erosion. Based on GIS, RS and InVEST-SDR model, this paper simulates the soil erosion in 2015 and analyses the effect of different influencing factors on soil erosion. The results showed that: 1) In 2015, the soil erosion in the study area was mainly slight and light erosion, in spatially, the north-western part of the study area was more eroded than other regions; 2) The effect of vegetation cover on soil erosion presented bimodal pattern mode; 3) The effects of elevation and slope on soil erosion had a critical value of 1300 m and 30 degree; 4) Forestland was the main type of land use that produced the largest amount of soil erosion in the region, followed by cropland and grassland.
Characteristics and trends of water quality in underground caverns in island
Authors: Ji Yuyu , Jin Qiannan , Xiao Yizhi , Xu Mengqian 
Published: December 2019

Abstract
Underground caverns can be used as a supplementary water resource in those islands away from the continent. The groundwater quality is then becoming an important condition for ensuring the safety of water supply. Based on the water quality monitoring data from April 2017 to July 2019, the trend of water quality indices such as pH, CODMn(permanganate index), NH3-N(ammonia nitrogen), turbidity, TN(total nitrogen), TP(total phosphorus) and chloride were analysed by Kendall-trend-test method. The Pearson-correlation-method is also used to analyse the relationship among these indices in this study. The results show that: (1) For different forms of underground caverns, the concentration of pollutants and the number of bacteria in fully closed cavern is relatively low compared to the semi-closed cavern, the total number of bacteria is only 9 CFU/mL, and the DO(the dissolved oxygen) is as low as 5.12 mg/L. The concentration of pollutants in underground caverns with surface water is higher than the rainwater, which demonstrates that the groundwater quality is actually worse than the water source. (2) The water quality of underground caverns will change variously with time. The concentrations of CODMn and NH3-N will decrease gradually with time, the TN will increase gradually, the concentration of TP will decrease significantly in fully closed caverns, while it will not change too much in semi-closed caverns. (3) Correlation analysis showed that there was no significant relationship among TP, TN and chlorophyll in different forms of caverns. In order to ensure the safety of water quality, the underground caverns should be disinfected, sterilized, and moreover, the sludge should also be cleaned up regularly.
Comparative analysis of the runoff peak and non-point source pollution load of the initial area and the residential community developed from the area in Wuhan
Authors: Xu Tianhui 
Published: December 2019

Abstract
Urban water environment and water safety problems are growing increasingly severe along with the accelerating rate of urbanization. It is very important to study the influence of traditional development model on water quality and quantity. In this study, SWMM model was developed to simulate and analyse the peak flow and pollution load changes before and after development in Wuhan residential communities with the short duration rainfall lasting 2 hours. It was found that under the traditional development model, the impervious surface area increased greatly, the peak runoff of rainwater increased by 66%∼183% compared with that before development, and the relationship between peak flow increment and rainfall before and after development can be calculated with ΔR=-0.023 H2 +1.49H+160. The confluence speed of rainwater decreased by 6.82%∼20.19%. After the development, the amount of pollutants and the initial concentration of pollutants increased significantly, and the concentration of pollutants converged faster. The maximum concentration of COD, TN and TP increased to 2.09 times, 2.19 times and 2.16 times, respectively. The annual pollution load of COD, TN and TP increased by 52.31%, 45.27% and 43.54%, respectively.
Research on unified system framework of flexible resources under market environment
Authors: Chen Hao , Zhang Siyuan , Li Qiwang , Liu Dunnan , Zhao Ningning 
Published: December 2019

Abstract
Flexibility resources are the sources of the ability to service the system’s flexibility requirements over a given time scale. Under the power market environment, the price plays the role of economic levers, closely linking the multiple links of source-net-charge-storage, and fully tapping the flexibility potential of resources within the system. Flexibility resources are extended from the traditional generator side units to the complex system with multi-dimension and multi-time scale. Therefore, this paper takes the flexibility demand of power system as the starting point, takes the life cycle of physical flexibility resources as the main line, and studies the unified system of flexibility resources from the aspects of flexibility measures and callable resources.
Study on speciation and Distribution characteristics of Heavy Metals in soil around typical Coal Gangue in Fengfeng Mining Area
Authors: Zhang Yanjie , Zhang Yuling , Zhang Yuan , Meng Lingyao , Shi Miwei 
Published: December 2019

Abstract
Taking the coal gangue mountain in Hebei Fengfeng mining area as the research object, 30 soil samples were collected in the east, southeast and southwest directions within 300m of the coal gangue mountain boundary, and the coal gangue stacking were used to study the heavy metal pollution of the surrounding soil. The heavy metal form of soil around coal gangue was extracted by Tessier five-step continuous extraction method, and analyzed its morphological characteristics and biological activities. The results showed that: (1) Hg and Cr were mainly retained in the soil as residual, which did little harm to the environment; Pb and Cd are mainly exist in the soil in residual and bound to iron-manganese oxide; Cu is mainly exists in the soil in residual and bound to organic matter. (2) According to the analysis of the available coefficient and migration coefficient of soil heavy metals in soil, Cd belongs to medium risk. Cu and Pb are low risk, and Cr and Hg are considered as risk-free because their available state content is lower than the detection limit.
Study on the Influencing Factors of Carbon Emission in the Production Stage of Building Materials and the Countermeasures for Reducing Carbon Emission
Authors: Shengju Zhang , Rui Wang , Xingang Wang 
Published: December 2019

Abstract
At present, the carbon emissions of the construction industry still account for a large proportion. This paper starts with the energy consumption of the main building materials in the production stage of the building, analyses the carbon dioxide emissions of common building materials, and combines the total amount of building materials used in the total construction area of Yangzhou City in Jiangsu Province in 2017 to utilize energy consumption carbon. The emission formula approximates the amount of carbon emissions used in building materials in Yangzhou City for the whole year, and proposes corresponding emission reduction measures based on the analysis of the main influencing factors of carbon emissions in the production stage of building materials, thus providing corresponding theory for the current carbon reduction in construction industry.
Experimental Study On The Axial Compression Of GRP-Concrete-PVC Tube Composite Column
Authors: Yu Y. , Wu Z.J. , Guan H. W. 
Published: December 2019

Abstract
GRP-Concrete-PVC composite column is a new type of composite column which is composed of GRP outer tube, PVC inner tube and reinforced concrete filled between them. A composite column with a moderate hollow ratio of 0.367, concrete strength grade C30, and reinforcement ratio of 0.9% is designed to investigate the failure phenomenon and loading capacity under axial pressure by static test. It is found that the appearance of the GRP tube has no obvious damage when the load is less than 30% of the ultimate bearing capacity, although some local cracks are initiated in GRP tube. As the load increases, the cracks propagate continuously. Occasionally the specimen has a crisp sound and a squeaking noise. When the load reaches 96% of the ultimate bearing capacity, the upper part of the GRP tube shows some damage character (tube colour turns to white), the outer parts of the tube are tore off, and the glass fiber bundle is layered off. When the load reaches the ultimate bearing capacity, the cracks developed look like an inclined Z-shaped band. The cracks propagate upto around one third of the specimen height from the bottom. The concrete inside the composite column is crushed. The relationship between the axial load and the strain of the GRP tube in different direction is analyzed.
Research of high-performance DLC Film on Si Substrate by Pulsed Laser Deposition
Authors: Shuyun Wang , Xu Liu , Yi Liu , Weixin Zhang , Zhuolun Li , Yanlong Guo 
Published: December 2019

Abstract
Femtosecond pulsed laser was used to deposit DLC films. Through methods of oxygen ambient and mixing silicon, no-hydrogen DLC films were deposited with more excellent transmission, hardness, adhesion and stability than those by chemical vapor deposition or traditional pulsed laser deposition (PLD). The transmission of 3∼5μm band was larger than or equal to 91.7%, and the hardness up to 40∼50GPa. All the films passed the tests of high temperature, low temperature, salt-fog and heavy-friction tests. The performances of the samples satisfied optical engineering need.
Study on Durability of Recycled Large Aggregate Concrete
Authors: Chen Jianguo , Liu Luqiang , Zhou Maixi , Huang Zhuojie , Li Ruoyu , Zhang Zhenqi , He Binhai 
Published: December 2019

Abstract
In this paper, natural large aggregate concrete (NAC) and recycled large aggregate concrete (RAC) are prepared. The impermeability, carbonation resistance, chloride ion penetration resistance, early crack resistance and dry shrinkage of the two kinds of concrete are compared and studied. The results show that, compared with NAC, when cured to the same age (28d), the water seepage height of RAC increased by 23.11%, and its relative permeability coefficient increased by 40.81%; carbonization depth increased by 14.63%; 6h chloride ion electric flux increased by 24.85%, chloride ion diffusion coefficient increased by 24.90%; the number of cracks per unit area increased by 68.88%, and the total crack area per unit area increased by 37.80%. The dry shrinkage rate increased by 50.46%. Although RAC’s durability is worse than NAC, RAC prepared by reasonable technology has the same performance as NAC and can be used instead of NAC to some extent.
Study on Mechanical Properties and Constitutive Relationship of Recycled Large Aggregate Concrete
Authors: Li Lin , Chen Jianguo , Zhou Maixi , Wu Guangjun , Huang Zhuojie , Li Ruoyu , Yan Zhiyong , Fan Rihong , Zhang Zhenqi , He Binhai 
Published: December 2019

Abstract
In this paper, two C25 strength grades of natural aggregate concrete (NAC) and recycled aggregate concrete (RAC) were prepared, and the compressive strength, splitting tensile strength and anti-wear strength were studied. And analyzing the two kinds of concrete under uniaxial compressive and tension state of the constitutive relation, the corresponding constitutive equation is established. The research results showed that: compared with NAC, the compressive strength of RAC at 7d, 28d and 56d decreased by 3.17%, 6.68% and 8.42% respectively, and the splitting tensile strength of RAC at 7d, 28d and 56d decreased by 4.76%, 6.67% and 5.48% respectively, the anti-wear strength decreased 59.02%, and the wear rate of specimens increased by 157.87%; the stress-strain curves of two kinds of concrete under uniaxial compression and tension were fitted, and the related constitutive equations were established. Although the mechanical properties of RAC are lower than that of NAC, they are not much different and can be used to replace NAC to some extent.
Electrochemical degradation of atrazine on Pt anode with cathodic electro-generation of H2O2
Authors: Liu Yucan , Zhu Kai , Sun Qing , Sun Yulin , Zhu Huayu , Huang Lihua , Hao Xiaodong 
Published: December 2019

Abstract
This study investigated the degradation of atrazine by anodic oxidation with cathodic eletrogeneration of H2O2 (AO—H2O2). A series of trials were conducted in an undivided cylindrical glass cell using Pt anode and graphite cathode, air was compressed into working solution at atmospheric pressure. The oxidation experiments were carried out to assess the influence of primary parameters (current intensity, air feeding flow rate, cathode—to— anode area ratio and initial organic concentration) on atrazine removal. During all trials performed, the concentration of atrazine declined significantly, and in the best operating parameters found (current intensity 80 mA, air feeding flow rate 0.9 L min-1, cathode—to— anode area ratio 12), 72% of atrazine removal was obtained within 120 min oxidation time. CV tests exhibited that the intensity of anodic peak was strengthened when the working solution is O2—saturated, implying that O2 might play an important role in the anodic oxidation of atrazine.
Experimental Study on the Influence of Red Clay Content on the Properties of Plastic Concrete in Bijie Area
Authors: Li Lifeng , Chen Changlu , Deng Duilin , Zhang Xiaohu , Han Liuping 
Published: December 2019

Abstract
In order to study the influence of red clay content on the performance of plastic concrete in Bijie area, Guizhou province, this paper designs the mixing proportion of plastic concrete with different red clay content, and measures the slump and diffusivity, elastic modulus, permeability coefficient and compressive and tensile strength parameters of plastic concrete with different mixing proportion. The experimental results show that the increase of red clay content has a negative effect on the working performance and mechanical parameters of plastic concrete. Red clay can effectively improve the permeability of plastic concrete. The research results of this paper have certain reference value for the application of plastic concrete in Guizhou water conservancy project.
Comparison between hydrogen production by alkaline water electrolysis and hydrogen production by PEM electrolysis
Authors: Guo Yujing , Li Gendi , Zhou Junbo , Liu Yong 
Published: December 2019

Abstract
Hydrogen is an ideal clean energy source that can be used as an energy storage medium for renewable energy sources. The water electrolysis hydrogen production technology, which is one of the mainstream hydrogen production methods, can be used to produce high-purity hydrogen and other energy sources can be converted into hydrogen storage by electrolysis. Hydrogen production by alkaline water electrolysis and hydrogen production by PEM electrolysis are all water electrolysis hydrogen production technologies that have been industrially applied. From the application point of view, the paper compares the working principle of the two kinds of electrolyzers, the process flow of hydrogen production equipment, advantages and disadvantages. This article provides a reference for relevant researchers.
Tianjin Energy Development Dilemma and Way Out
Authors: Zhao Baoguo , Xie Yan , Zhang Jian , Lu Xin , Yue Liang , Wang Yongli 
Published: December 2019

Abstract
This study will start from different aspects of the energy revolution under the background of energy development in Tianjin City. According to the situation of energy development in Tianjin, Tianjin’s energy supply and demand situation is studied. From the current situation of energy supply and demand, we understand the bottlenecks and challenges of energy development in Tianjin. We focus on the bottlenecks and challenges of energy development in Tianjin from three aspects of environmental protection, energy supply reliability and market mechanism. Finally, the implementation path of Tianjin energy production and consumption was studied. According to the current energy situation of Tianjin, the implementation path of Tianjin energy structure reform was proposed from the supply side and the consumption side respectively.
Research on the material properties of prestressed concrete girder bridge after exposed to fire
Authors: Chaowei Hao , Kang Liu , Hongyin Li , Laiyong Wang 
Published: December 2019

Abstract
The factors such as maximum temperature, duration, diffusion condition and concrete bursting at high temperature increase the difficulty of obtaining material properties by using temperature. In order to quickly obtain the real performance parameters of the materials of the pre-stressed concrete beam bridge in the post-disaster bridge evaluation, the appearance classification and material test of 32 hollow slabs demolished after the fire of the existing beam bridge in a highway were carried out. The relationship between the commonly used testing indexes and the properties of materials is obtained by measuring the properties of materials after fire. The applicability of these indexes is verified by the ultimate bearing capacity test and finite element simulation. The results show cracking and spalling of concrete at high temperature not only results in significant loss of section, but also significantly reduces the strength of concrete and prestressing steel strand in this area, which leads to the reduction of bearing capacity. When the spalling depth of concrete exceeds 2/3 of the net protective layer of steel strand after overfire, the reduction coefficient of compressive strength and tensile strength of pre-stressed steel wire reaches 0.7, which will seriously affect the ultimate bearing capacity. The normal plain round steel bar can be deviated safely to the design standard value when calculating the ultimate bearing capacity of the structure. The ultimate bearing capacity of the prestressed hollow beam after fire is analyzed by using the reduction relationship between the conventional inspection indexes and the material properties, and the finite element simulation, so as to meet the engineering precision.
Research on mining filling material prepared by high titanium metallurgy waste residue
Authors: Ren Chao , Li Keqing , Zhang Siqi , Cui Xiaowei 
Published: December 2019

Abstract
Using the vanadium titano-magnetite for iron-making, the steel enterprises have discharged water-quenched Ti-bearing slag. Due to the high titanium content, low activity and difficult-to-use characteristic, there are vast amount of high titanium slags, which not only occupies the land, but also causes resources wasting and environment polluted. This paper analyzed the chemical component, microstructure, grindability, activity index and other factors of high titanium slag and studied the mining filling material prepared by high titanium slag. The results show that the main chemical components of high titanium slag are similar with the ordinary slag. Both of them consist of CaO, SiO2 and Al2O3, all of which account for about 80% of the total weight. However, the content of TiO2 accounts for 8.4%, which is much higher than that of ordinary slag. Therefore, the grindability of TiO2 is poor. The solid waste cementitious material was prepared by slag, flue gas desulfurization gypsum and high titanium slag, whose specific surface area was 530 m2/kg. After the maintenance for 28 hours, the compressive strength of this material reaches 3MPa.
Study on properties development of the composite cementitious system with milled fly ash of ash dam
Authors: Zhang Jianfeng , Shi Yan , Wang Jixiao , Lv Xingdong 
Published: December 2019

Abstract
The performance development of the composite cementitious material system with fly ash and milled fly ash of ash dam were investigated. The results show that, compared with fly ash, the milled fly ash of ash dam with special morphology has not significant morphology effect and microaggregate effect at the initial hydration stage. Under the same conditions, the composite cementitious system of milled fly ash of ash dam has a larger water demand ratio and a longer setting time, and the early strength of concrete is relatively low, but the later strength increases rapidly, which is basically equivalent to the strength of concrete with fly ash. After mixing phosphorous slag powder, the water demand ratio of composite cementing system of the milled fly ash of ash dam is obviously reduced, and the setting time is further prolonged, but the strength of early cementing sand can be improved.
Research and Adjustment of Temperature Deviation on Heating Wall of Front and Rear Wall Opposed Coal-fired Boiler of 1000WM Unit
Authors: Yongjia Wang , Ying Chen , Kai Wang 
Published: December 2019

Abstract
No.2 boiler is designed by Dongfang boiler group Co., LTD, and is ultra supercritical parameter boiler with variable pressure. In order to alleviate the side wall temperature deviation and to reduce the maximum wall temperature of super-heater, the total air volume alteration test, external secondary air damper alteration test, over-fire air alteration test and the shrinkage adjustment is performed. The test results show that oxygen increase and shrinkage adjustment can improve the deviation of wall temperature and steam temperature. After increasing oxygen, plate super-heater wall temperature deviation reduced by 26 °C, and its outlet steam temperature deviation reduced by 14 °C. After shrinkage adjustment, plate super-heater wall temperature deviation reduced by 34 °C, and the wall temperature difference of final super-heater reduced from 50 °C to 25 °C, the wall temperature of side B plate super-heater reduced by 25 °C.
Study on the Effect of Ash-Slag Ratio on Mechanical Properties of Magnesium Slag Cementitious Material
Authors: Liu Qi , Ma Jianxun , Zheng Weiwei 
Published: December 2019

Abstract
Magnesium slag is a kind of industrial waste slag with silicate mineral as the main component when smelting magnesium metal. Its main component is similar to Portland cement clinker and can be used as cementitious material. In this paper, the mechanical properties of magnesia slag cementitious materials under different ash-slag ratios are studied and analysed. Magnesium slag and fly ash are prepared by composite method. The flexural and compressive tests are carried out. The effects of different ash-slag ratios on the mechanical properties of magnesia slag cementitious materials are studied. The experimental data are analysed and theoretical studies are carried out, and the conclusion is drawn on: (1) When the ash-slag ratio is between 0.43 and 0.8, the forming effect of Mg-slag cementitious material specimen is better; (2) When the ash-slag ratio changes from large to small, the properties of Mg-slag cementitious material will change greatly, from curable to powdered after curing, unable to form, and the critical value of the ash-slag ratio is between 0.25 and 0.43; (3) When the ash-slag ratio is in the range of 0.43-1.2, the mechanical strength of magnesium slag cementitious material is higher, the maximum flexural strength can reach 10 MPa, and the maximum compressive strength can reach 50 MPa.