bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Vibration Characteristics of Urban Substation Building and Transformer
Authors: Yuchao Ma , Juan Mo , Meng Nie , Xiang Li
Published: December 2019

The problem of vibration of the buildings and transformers in the urban substation has becoming more and more socially concerned. The urban substation and its associated building are taken as the research object. the vibration tests and modal shapes of the building and each floor slab were carried out. The transformer vibration and its noise were transmitted with obvious attenuation in the structural floor slab. The vibration transmission into the lower floor slab was higher than that of into the higher one. The further away from the transformer room, the vibration characteristics are weak, and the attenuation is no longer significant. At last, the finite element model was established for the urban substation. The transformer and floor slab vibration went through the simulated analysis and the consistent analysis results were obtained.
A novel high-order Voronoi algorithm and its application in affected coverage of health city assessment
Authors: Shuguang Deng , Guodong Zhong , Wenshu Li
Published: December 2019

The work of China’s urban health impact assessment (HIA) is still in the exploratory stage. From the spatial perspective of urban planning, using the natural topological characteristics of Delaunay Triangle, the high Order Voronoi Diagram algorithm of the order Delaunay Triangle data structure is applied in practice. This algorithm can deal with the k nearest neighbors and the mutual distance relationship, which can be effectively applied to the definition of the impact scope of healthy city evaluation, thus providing a new auxiliary method for health city evaluation research.
Analysis of Characteristics of Soluble Ion Pollution in Atmospheric PM2.5 in Shenyang City
Authors: Xue-yu Bai , Hai-bo Li , Ying-hua Li , Xiao-ming Zhao
Published: December 2019

The concentration characteristics of water-soluble ions in atmospheric fine particulate matter PM2.5 in Shenyang City were studied. Correlation analysis was carried out on the tested components. The results showed that SO42- and NO3- in the water-soluble ion concentration of PM2.5 in Shenyang City. The three ions of NH4+ account for a higher total ion concentration, accounting for 35.2%, 34.7%, and 11.6%, respectively. It was found that due to the unique terrain and climate of Shenyang, the spring pollution was more serious. Correlation analysis showed that the main forms of water-soluble ions in PM2.5 in Shenyang City were NO3NH4, KNO3, MgSO4, CaSO4 and so on.
Study on Green Development Efficiency of Yangtze Economic Zone in China considering Resources and Environment
Authors: Wei Li , Junyi Yan , Jingkai Wu
Published: December 2019

This paper evaluates the green development efficiency of 11 provinces and cities in the Yangtze River Economic Zone considering resources and environment. Input factors include assets, human resources and resources. Output takes into account GDP and major pollutants (as unexpected output). This paper makes a static analysis of the economic development efficiency of the provinces and municipalities in 2015. Considering the resource and environment constraints, the overall economic development efficiency is constrained to a certain extent. The Malmquist index model is used to calculate the changes of economic efficiency in 2005-2015, which is decomposed into pure technical efficiency, scale efficiency and technological progress index. Considering the impact of resources and environment, the overall economic efficiency of 11 provinces in the Yangtze River Economic Zone showed an upward trend in 11 years, with an average MI index of 1.014. Technological efficiency (EC) is declining as a whole. Pure technical efficiency (PEC) is the main factor that causes the decline of technical efficiency, while technological progress (TC) is an important factor to promote the increase of development efficiency during the research period. The results of regional analysis show that the decline of technological efficiency (EC) in Sichuan, Yunnan, Hubei and Anhui provinces is mainly affected by pure technological efficiency (PEC). The decline of technological efficiency (EC) in Guizhou, Jiangxi and Jiangsu provinces is mainly affected by scale efficiency (SEC).
Research status on soil and water pollution remediation and environmental impact of nanomaterials
Authors: Yang Ping , Zhang Lei , Huang Yu , Ouyang Zebin
Published: December 2019

Nanomaterials are a new type of materials, which have been widely used in many fields. In the field of environmental governance and restoration, nanomaterials are highly concerned by scholars all over the world. Due to the small particle size, strong reducing ability, high surface activity and large specific surface area, nanomaterials have obvious advantages in the rehabilitation and treatment of contaminated soil and water. At the same time, due to the characteristics of small particle size, low solubility and weak degradation ability, nanomaterials will have adverse effects on the ecological environment. In this paper, through literature research, the application of nanomaterials in soil and water pollution remediation and treatment is summarized, and the repair mechanism and influencing factors are briefly described. At the same time, the impact of nanomaterials on ecological environment is also summarized. On this basis, this paper points out that further research on measures to reduce the impact of nanomaterials on ecological environment should be carried out in the aspects of soil and water pollution rehabilitation and treatment.
Study on Spatial and Temporal Changes of Ecological Vulnerability in Weinan Area Based on GIS
Authors: Hao Fu , Xinlei Liu , Xuxiang Li
Published: December 2019

With the development of urbanization, the ecological environment of the typical agro-development city-Weinan is disturbed to varying degrees, and it restricts the coordinated development of resources, population and environment in the region. This paper combines social, economic and climate data to propose an index system suitable for the evaluation of ecological vulnerability in Weinan. The analytic hierarchy process was used to quantitatively evaluate the ecological vulnerability of the Weinan region. The results showed that from 2000 to 2011, the urban ecological vulnerability index(EVI) was higher than that of the surrounding counties, which had a great relationship with the impact of urbanization on ecological vulnerability. The extremely fragile areas of ecological vulnerability in Weinan were mainly distributed in the urban areas of Linwei District and Hancheng. The main reason was that these cities had a fast development speed and a strong industrial base, which had a great impact on the ecological vulnerability.
Research on pollution characteristics of Expressway runoff in Guizhou, China
Authors: Li Qiang , Dong Bochang , Xi Chenggang
Published: December 2019

The author selected three expressways in Guizhou as the research objects, and the runoff pollution characteristics were researched by sampling, measuring and analyzing runoff during the rainfall. According to the research data, the primary pollution factors in expressway runoff such as SS. COD and Petroleum had greater pollution intensity; the BOD5, NH3-N, TP and Pb had medium pollution intensity, which were defined as the secondary pollution factors; the range of BOD5/COD was 0.0351∼0.1025, which means a poor biodegradability for the expressway runoff. The expressway runoff showed different pollution characteristics and discharge rules, which were mainly affected by the rainfall and rainfall intensity. The first flush effect (FFE) was mainly medium and weak in the research area, and the degree of FFE was relatively weak under the light rain conditions, FFE didn’t occur in some rain events. This work is expected to pave the way for the pollution control of expressway runoff.
Electrochemical degradation of chemical wastewater by anodic oxidation process
Authors: Zhu Kai , Zhu Huayu , Feng Shangti , Fu Jianying , Guo Debao , Sun Qing , Huang Lihua , Hao Xiaodong
Published: December 2019

The wastewaters produced in chemical production contain large numbers of persistent organic pollutants, posing potential adverse impacts to aquatic ecosystem and human health. In this work, the electrochemical degradation of organic pollutants in chemical wastewater belonging to Sunny wealth chemicals (Linyi, Shandong Province) was conducted using anodic oxidation process. Three commercially available anodes (Pt, boron-doped diamond (BDD) and Ti-Ru-Sn ternary oxide (Ti/RuO2-SnO2)) were chosen to investigate the effect of several primary operating parameters, such as electrolyte composition, electrolyte concentration and applied current density. Total organic carbon (TOC) was detected as reference parameters to assess the performance of anodic oxidation. The experimental results show that BDD anode exhibited excellent oxidation capacity for degradation of organics in chemical wastewater, achieving over 30% removal efficiency in all cases within 4 h. TOC removal efficiency of 52% was obtained with BDD anode in 4 h of reaction time at applied current density 30 mA cm-2, NaCl concentration 0.05 mol L-1; nevertheless, less than 45 % of removal was achieved with Pt and Ti/RuO2-SnO2 anode under the same conditions.
Prediction of Daily Water Consumption of Residential Communities Based on Correlation Analysis and BP Neural Network
Authors: Liu Longlong , Li Wenzhu , Liu Xin
Published: December 2019

In recent years, with the rapid development of cities, water resources are becoming increasingly scarce. Reasonable prediction of community water use is an important basis for regional water resources allocation, effective management of water resources and water conservation. The prediction model of BP neural network based on correlation analysis is established. Firstly, the influence factors of water consumption are analyzed by the correlation analysis theory, the influence size is sorted, and then the partial autocorrelation theory is used to analyze the daily water flow sequence, and the optimal delay time is determined, and then the input variables are determined. Then the BP neural network model is used to predict the water consumption of the community. Finally, the BP neural network model based on the correlation analysis is compared with the other models. The results show that the average error of forecasting model for residential community water consumption is 2.21% and the maximum relative error is 6.87%. Compared with the BP neural network model without correlation analysis and the least squares support vector machine model, the error is the smallest.
Heavy metal pollution and potential ecological risk in urban river sediment of Huai’an City, China
Authors: Wei Li , Jue Yang , Xiaojie Zhao , Pengyun Hao
Published: December 2019

Sediment heavy metal pollutant monitoring was carried out at 16 monitoring points of three rivers and one lake in Huai’an city. The contamination degree of heavy metals was evaluated by geoaccumulation index. The potential ecological risk of heavy metals was assessed. The results showed that Hg and Cu geoaccumulation index class exceeded moderately polluted level, especially Hg, and two monitoring points reached highly polluted level. Hg pollution is at a high/extremely high potential ecological risk. Most of the other single-factor heavy metal indexes are at a low ecological risk level. The comprehensive ecological risk index of 6 monitoring points showed a high potential ecological risk. The Hg in urban rivers sediment of Huai’an may come from the deposition of long-term domestic sewage discharge or domestic refuse dump.
Geological Disaster Survey and Treatment Strategies of Yingwanzhen Subway Station, Changsha
Authors: Zhang Chenguang , Zha Daohan , Zhou Hongxia , Tang Xiangwei , Liu Kuisong , Bao Junfan , Zhang Yong , Hu Haifeng , Jiang Haidong
Published: December 2019

In order to solve such problems as ground subsidence, water and mud bursting and shield machine foundering in subway construction which are caused by water-rich karst geological conditions, complete technological process is established to detect and treat karst in urban areas. The occurrence of natural electric field frequency selection method and groundwater determine groundwater occurrence vector that karst and fault fracture zone, and make use of the grouting technology of karst fracture with the treatment. The construction of Yingwanzhen Stationon Changsha Metro Line No. 4 provesthe favorable effect of the detection technology and treatment measures, which provides experience and reference for the construction of Changsha subway and underground engineeringin other cities with water-rich karst areas.
A laying hen breeding environment monitoring system based on internet of things
Authors: Zhai Zhifen , Zhang Jianhua , Chai Xin , Kong Fantao , Wu Jianzhai , Zhang Jing , Han Shuqing
Published: December 2019

The breeding environment of laying hens has an important influence on the growth of laying hens, the prevention and control of diseases, and the yield and quality of eggs. Therefore, the real-time collection and utilization of the environment information of laying hens is the key point of breeding laying hens. In this study, the environmental information monitoring and control equipment and systems for egg-breeding laying hens were integrated and developed. The real-time monitoring of the environment information of the laying hens and the information query function on the webpage and mobile devices was realized. The stability and versatility testing of equipment and systems were completed through the pilot deployment of equipment and systems in a laying hen farm in Beijing. The design and development of the equipment and system can provide technical support for the modernization, mechanization and information management of laying hens.
Information Integration and Environmental Monitoring for Cage Pigeons
Authors: Chai Xin , Zhai Zhifen , Zhang Jianhua , Kong Fantao , Wu Jianzhai , Sun Wei , Zhou Xiangyang , Han Shuqing
Published: December 2019

Environmental changes in the farm can have a significant impact on the healthy growth of cage pigeons, disease prevention and the quality of pigeon meat. The stability and adaptability testing of environmental monitoring equipment and systems was completed through the pilot deployment of IoT Ranch in a pigeon farm in Beijing. An integrated program for real-time monitoring of environmental parameters of cage pigeons is implemented. Moreover, a system for informatizing and researching environmental information and real-time querying information on a webpage or mobile terminal is developed. The information-integrated environmental monitoring equipment and system can provide technical support for the modernization, automation and digital management of cage pigeons.
Combustion Optimization Test of “W” Flame Furnace Based on Orthogonal Experimental Design
Authors: Xi Yan , Chao Zhao , Xuefei Li , Shuai Wang , guanhua Xiao
Published: December 2019

This paper focuses on the selection ideas, test methods, test results and analysis of a “W” type flame furnace combustion test program. Under the electrical load of 300MW, 250MW, 200MW and 150MW, the orthogonal test method is adopted to change the “furnace outlet oxygen amount”, “secondary wind and grading wind distribution mode”, “burning air opening degree”, “secondary damper combination method” and “heat load distribution” of the boiler so as to make clear about the impact of various operating conditions on boiler efficiency and NOx emission level, and summarize the optimal operation mode of the boiler. The combustion adjustment can improve the economic and environmental protection of the boiler under different working conditions, which provides data support for equipment safety, environmental protection and economic operation, and provides reference for boiler combustion optimization test research and combustion optimization of the same type of furnace.
A Review of Worker Behavior-Based Safety Research: Current Trends and Future Prospects
Authors: Li Xingwei , Long Hongyu
Published: December 2019

The daily casualties and environmental damage caused by accidents in different organizations around the world have attracted the attention of industries, academia, and governments. Thus, worker behavior-based safety has become one of the key areas of safety management research, as the unsafe behavior of workers has a significant impact on production performance. This study carries out a systematic literature review to build a model of international worker safety behavior research that examines the relationship between safety behavior and standards, supervisor safety behavior, and other influencing factors. From the perspectives of influential factors, industries, research methods, organizational levels, enterprise size, and demographic characteristics of workers, the pressing issues of worker safety behavior research are generalized and the characteristics of the research results summarized. Finally, based on the analysis, we conclude by identifying scope for future research: (1) innovation in the research theories supporting worker behavior-based safety; (2) innovation in research methods; (3) and innovation in the perspectives of worker behavior-based safety research.
Evolution Trend of the Changjiang (Yangtze) Estuary with reduced incoming sediment
Authors: Zhou Jian-yin , Wang Min , Chen Zheng-bing , Zhao Jin-qiong , Hu Chun-yan
Published: December 2019

The reduction of fluvial sediment input has brought new features to the evolution of the Changjiang (Yangtze) Estuary. The response of river channels and shoals in the Changjiang Estuary are still unclear. A two-dimensional model of water and sediment transport in the Changjiang Estuary is established by using MIKE21. The sediment gradation and the flocculation of the fine sediment have been considered in the model. After calibration, the future evolution trend of the Changjiang Estuary was simulated based on the measured terrain in November 2016. The inflow of water and sediment at Jiangyin from 2008 to 2017 were taken as the upstream inlet conditions. The simulation results show that the pattern of river channel and shoals in the Changjiang Estuary will basically remain, and the main trend of bed evolution is erosion in deep channel and siltation of shoals.
Safety Risk Assessment of Prefabricated Building Construction Based on Bayesian Network
Authors: Jin Yuncan , Zhang Jinglin , Sun Ling
Published: December 2019

A safety risk assessment index system including four types of risk conditions: foundation pit construction risk status, construction and shipment risk status, hoisting operation risk status and prefabricated component installation risk status is established. Based on Bayesian network, fabricated by Netica software to evaluate the construction safety risk probability, through the function of Sensitivity to Findings conduct sensitivity analysis on the probability of risk occurrence. Based on the risk calculation, get the more prominent risk factors in each type of risk situation. According to the result of risk assessment, the countermeasures of construction safety risk of prefabricated building are put forward.
Investigation and Utilization of Ledum palustre L. Resources in the North Temperate Zone
Authors: Ren Guoli , Chang Wenbo , Miao Tianlin , Wang Changbao
Published: December 2019

The field survey methods were used to investigate the species and distribution of wild Ledum palustre ssp. decumbens in the Daxinganling area. The results show that Ledum palustre L. is densely distributed in the Daxinganling area, distributed at high latitudes and high altitudes. It is widely distributed and a single species is concentrated. Daxing’anling area is rich in Duxiang resources, and has high economic value and medical value. The rational development and utilization of Ledum palustre L. resources can promote local economic development. Ledum palustre L. is a low-length, long-green shrub plant that is cold-tolerant, resistant to cockroaches, and resistant to inferiority. It is abundant in the Daxinganling region of China and is a resource-type plant. The extract of Ledum palustre L. contains bactericidal, Anti-inflammatory, anti-tumor and anti-oxidation components have certain development potential. Due to the different content of different components in different periods and different regions, and the immature extraction technology, it has not been developed and utilized so far. In this paper, the status quo of wild Ledum palustre L. is described in many aspects. The problems faced by Ledum palustre L. are also listed. The development prospect of Ledum palustre L. is analyzed reasonably.
Study on Pollution Risk Index Based on ESI and Stochastic Simulation
Authors: Chen Rongchang , Liu Chen
Published: December 2019

A calculation method of the risk index of oil spill pollution is presented, and main factors are considered in the method, such as the shoreline environmental sensitivity index ESI, the environmental sensitivity index SI, the statistical probability of the pollution, and the minimum time to be polluted. After 600 stochastic simulations of oil spill trajectory and fates model, the calculation of the pollution probability is carried out for the probability of the pollution to each segment of the shoreline and the minimum time to be polluted. The ESI and SI indexes, which indicate the shoreline environmental sensitivity, are determined by satellite image analysis, field investigation, data investigation and so on. The calculation method can be applied to the risk assessment of the oil spill accident with environmental conditions not determined, and provide the basis for the emergency preparedness and planning for the oil spill accident. The method was applied in Jiaozhou Bay, and the changes of the risk index along the shoreline was analyzed.
Application of RAP Variability Control in Plant-Mixed Hot Regeneration of Asphalt Pavement
Authors: Ailing Yao , Fangyuan Han , Runshu Hao , Leiting Wang
Published: December 2019

Plant-Mixed hot regeneration technology is widely used because it can solve all the diseases of used asphalt pavement, however, in the current stage of reuse, there is a phenomenon that the indices of recycled asphalt mixtures(RAP) are discrete and difficult to control, the reason for the analysis is due to the large variability of the used asphalt mixture. In this paper, the traditional RAP design method is improved by the classification of the used materials, extraction-microporous membrane vacuum decompression filtration-distillation combined separation device, reduce the coefficient of variation of asphalt and aggregate in used asphalt mixture, effectively control the variability of the used asphalt mixture, so that the each index of the Plant-Mixed hot regeneration can achieve precise control of various indicators in the mix design stage.
Health risk assessment of formaldehyde released from several Chinese dishes cooking activities
Authors: Zhao Jingjing , You Xueyi
Published: December 2019

To study the effect of Chinese dishes cooking activities on the health risk for domestic cook, numerical simulations are executed under different air flow rates for three oil-based Chinese dishes cooking activities. The concentration of formaldehyde in respiratory area during cooking process is obviously influenced by the cooking dishes. And the effect of air flow rate of range hood on the formaldehyde capture is not as significant as that of the cooking method. The predicated results show that the formaldehyde concentration is 4.5-5.5, 2.8-3.6 and 1.2-1.5 times of the prescribed limit when cooking the dishes of stir-fried mutton, pan-fried chicken with onion and deep-fried pork, respectively. The high air flow rate is recommended for improving formaldehyde capture efficiency (CE) of range hood. The potentially benefit effects induced by higher air flow rate is reliable in the cooking activity of stir-fry mutton. Using high air flow rate of 19m3/min can reduce the risk by 11.86% compared with using low air flow rate of 10m3/min. Low air flow rate is more suitable for cooking activities with low release rate of cooking oil fumes (COFs), in order to better protect the health of cooks.
Analysis of air quality characteristics in Dezhou
Authors: zhimei Wen , yulei Zhao
Published: December 2019

Based on the national air quality network monitoring and management platform, the data from July 1, 2018 to June 30, 2019 were obtained, and major pollutants were analyzed. The study found that air quality grade in spring and summer in Dezhou region was better than that in autumn and winter; The air quality in Decheng district was better, and Xiajin county was relatively poor in the five monitoring points. According to the results, the corresponding control measures are proposed in order to provide reference for the joint prevention and control of air pollution in Dezhou.
Stability analysis of unsaturated soil slope under rainfall and seepage conditions
Authors: Di Shengjie , Zhang Ying , Zhou Heng , Li Hongru , Huang Peng
Published: December 2019

Rainfall infiltration and canal seepage are the main causes of slope instability, the paper considered the factors such as soil type, soil-water characteristic curve and rainfall duration, and analysed the stability of unsaturated soil slope. The calculation results show that rainfall has a significant impact on the stability of the slope, as the matric suction in the unsaturated soil makes the slope safer. However, it reduced during rainfall, so the safety factor is greatly reduced when the continuous rainfall occurred. Moreover, when rainfall infiltration and canal seepage coupled, it is worse than just taking one factor into account, and the slope safety factor decreases from stable to unstable.
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.