bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of the Test System for the Ability to Withstand the Overload Current of the Low Voltage Control Equipment Applied in Coal Mines
Authors: Zhang Hongkui , Ni Rui , Zhu Shuming
Published: July 2020

On the basis of the development prospect of energy industry and the safety production situation of coal mine, the composition structure and working principle of low-voltage control equipment applied in coal mines were analyzed, and the electric power and thermal effect theory of low-voltage control equipment applied in coal mine were studied, and the design scheme of overload resistance test system was put forward, meanwhile, the flameproof electromagnetic starter for coal mines was tested according to the coal industry standard. The test results show that the design of the overload tolerance is reasonable.
An empirical analysis of the influence of typical highways in the Sanjiangyuan Protected Area on wetlands
Authors: Sun Haixiu , Zhao Yuanpeng , Wang Zhengyun , Zheng Tianli
Published: July 2020

Wetlands play an important role in water conservation and biodiversity accumulation. The crossing highways may cut off the water flow relationship between wetland patches, and further influence wetland ecosystems. In this study, we investigated the situation of wetlands based on field survey, aerial photographic and remote sensing image interpretation along two roads (Gongyu Expressway and S308 road) in the Sanjiangyuan Part. We found that there were only two places exhibits a different wetland image at the either side of the road. Road construction basically did not obstruct wetlands. It was also noted that by improving existing culverts, measures could be taken to avoid or alleviate such phenomena.
Analysis of the Performance Improvement Effect of Combined Packing for Oil and Gas Well Packer
Authors: Liu Huifeng , Zhang Wei , Cao Yinping , Dou Yihua
Published: July 2020

Packer is a commonly used downhole tool for oil and gas wells. In order to understand the working performance of combined packing, a finite element analysis is performed on the double expansion-compression-expansion combined seal packers to find the effect of combined seal. Taking packers sealed in casing with a diameter of 114.3mm and a wall thickness of 12.7mm as an example, finite element models are established for double expansion and expansion-compression combined seal packers respectively. By applying packer-setting pressure to the finite element models and processing the strain-stress data resulting from finite element analyses, the distribution rules of packing stress and contact pressure between the packing and the inner casing wall for different combined seal packers are obtained. The working performance of the single expansion seal packer and the double expansion and expansion-compression combined seal packers is compared and analyzed. According to the results of finite element analyses, both double expansion combined seal and expansion-compression combined packings can be in effective contact with the casing under a packer-setting pressure of 15MPa, and the contact pressure between the combined seal packing and the inner casing wall is larger than that of a single seal packing. The combined seal packer therefore can actually improve the sealing and packoff effect of the packer. The expansion-compression combined seal has the highest pressure bearing capacity, which is 50% higher than that of the single expansion packer. The lower packing of the double expansion combined packer and the expansion packing of the expansion-compression combined seal packers should be appropriately strengthened and thickened to improve the packing performance of the combined seal packer. The results of contrastive analysis reveal the improvement effect of the sealing and packoff performance of the combined seal packers, which can be used as a reference for the improved design of such packer.
Comparative study of slope stability of a highway constructed in hilly area using limit equilibrium and finite element methods
Authors: Khan Muhammad Israr , Wang Shuhong
Published: July 2020

Slope stability analysis is one of the most challenging field in which the slope factor of safety is the main concern. Normally limit equilibrium and finite element methods are used to analyse such slopes. A variation in the result is also found in both these analysis methods. This analysis work is done using both limit and finite equilibrium methods. The variation in the factor of safety is investigated and a correlation is developed. These values can be used to know about the safe value for factor of safety in any homogenous slopes.
Study on coal quality development and application in Hetaoyu coal mine
Authors: Qi Huili , Gai Ke , Ma Dongping , Liang Xianfang , Sun Ning
Published: July 2020

Based on the research at home and abroad, the development and application of coal quality in Hetaoyu coal Mine was studied in this paper. We focus on the coal quality development, application process in accordance with local conditions, improving coal quality utilization rate, and environmental protection. The quality data of Walnut Valley coal are analysed. Some Suggestions on the development and application of coal quality are put forward.
Research on Combined Method of Sedimentary Facies under Multiple Conditional Constraints
Authors: Qiao Shasha
Published: July 2020

When we were studying the oil field, this article described the morphology, scale, and connectivity of sand bodies by observing the combination of sedimentary facies in the oil field. At the same time, we also found that the sand body is related to the origin, distribution, physical properties, and Changes in heterogeneity, etc., these factors play a crucial guiding role in the development and adjustment of oil fields. However, in specific phase belt combinations, subjective influence factors are relatively large, and the phase belt maps of oilfields have certain limitations in the development adjustment process. In this paper, the sedimentary facies of the Sapu oil layer in the Harwin Oilfield are re-understood through various constraints such as regional sedimentary environment, well-seismic combined reservoir prediction results, and the matching relationship between fluids and structures on the plane. We make the combination of facies zones more reasonable. Accurate, providing a basis for adjustment of oilfield water injection development.
Research and Field Application of ultra-high temperature and high pressure gas wells test in the northern slope of Tazhong
Authors: Cui Longbing , Liu Lian , Xie Jin , Zou Wei , Zhang Naiyan
Published: July 2020

The Shunnan block located on the northern slope of Kathake uplift on the footwall of the Tazhong No. 1 fault zone in the central uplift zone of the Tarim Basin is featured by ultra-large burial depth, which results in the formation pressure of higher than 140 MPa, the formation temperature of higher than 200°C, the serious leakage of large density mud and the extremely-high difficulty in test. Through continuous innovation and exploration of processes and technologies, and continuous summing up of experiences, a complete set of test technologies for the three ultra-wells in the Shunnan block have been formed and successfully applied in the test of well NS7 that has the most adverse working conditions, which provides a certain reference significance for the test of similar three ultra-wells.
General situation and hydrologic characteristics of xijiang river basin
Authors: Zhou Chengfeng , Pan Binlin , Jin Xin
Published: July 2020

Taking Xijiang River Basin as the research area, this paper introduces the general situation of natural geography of the area, analyzes the hydrological characteristics of precipitation, evaporation, runoff, flood and water quality, analyzes the change law of each hydrological element, and provides the hydrological and meteorological regular data for the regional social and economic construction.
Prediction and Spatial Correlation Analysis of Standard Grain Theoretical Capacity for Land Improvement Based on GIS Technology
Authors: Kong Hui
Published: July 2020

China has a large population and a limited area of arable land. In recent years, society has developed rapidly, the area of arable land has gradually decreased, and the issue of food has become a highly regarded issue. With the promulgation of a national policy to adhere to the red line of 1.8 billion acres of arable land, the rational management and improvement of unused and degraded lands will be improved, and the problems will be solved in terms of both arable land area and arable land quality. To sum up, the issue of grain is the issue of yield. The fluctuation of grain yield is the most critical factor. Therefore, the use of GIS technology to analyze and monitor the change in grain yield from cultivated land resources has become a new management of cultivated land resources. And powerful means of optimal use. In this paper, the correlation coefficients of spatial autocorrelation are used to characterize, through the global spatial autocorrelation and local spatial autocorrelation, with the help of statistical yearbook data processing, the theoretical capacity of Shaanxi Province standard grain unit theoretical capacity is predicted and spatial autocorrelation analysis is performed.
Comparative Test and Analysis of Falling-Ball Instrument and FWD Deflection Detection Method
Authors: Zhang Chunxia , He Huayang , Xue Yingqi , Luo Zhu
Published: July 2020

Through the experiment, the deflection detection methods of the falling-ball instrument and the falling weight deflect meter (FWD) were compared, and their correlations were analyzed. The results show that the test depth and range of FWD are larger than the falling-ball instrument, and there is a good linear relationship between the road surface deflection values measured by the falling-ball instrument and FWD.
Study on the Best Shape and Stability of Sand Castle
Authors: Zhang Wenqiang , Zhang Ziliang , Liu Zhiwen , Ye Chunsheng
Published: July 2020

This paper analyzes the factors that influence the stability of the sand castle, and sandcastle stability of different shapes are care, by modeling concluded. Beach sand castle by both tidal and wave interaction. Through some will be converted to calculate the impact of the two together, we simulate water flow after the start ashore process to Shah’s fort, through to find reasonable assumptions speed of the water and the water depth and leave as a function of the distance between the coast, while the unified regulations the volume of the sand castle is 8 m 3, and the distance from the bottom of the sand castle to the coast is 2 m to 4 m to facilitate the comparison of the influence of water flow. Firstly, we have determined that cones are the best basic 3D geometric foundation of sandcastle. This model is a simple static model, because we want to avoid the situation that force exerted by seawater can directly destroy our foundation of sandcastle. Secondly, we made starting coulombic stars increases the shear strength is necessary to increase the internal friction angle, and then we made derived experimental data of the relationship between the angle of internal friction and the ratio of water and sediment. In the role of rainwater from this San Ge analyzed angle that is, the rain will affect the flow of water into the sand castle of speed and depth, while the rain continued the process, make sandcastles water content increases large, shadow rang its strength, finally, rain the shock effect, the presence of momentum, will destroy the strength of the sand castle.
Study on the Reclamation and Ecological Reconstruction of Abandoned Land in Mining Area
Authors: Zhang Yabo , Sun Sha
Published: July 2020

Land is the basis of human existence and an important foundation for social development [1]. Due to its vulnerability and particularity, the land in the mining area has attracted much attention in the ecological environment protection work. With the development of mineral resources, it will inevitably cause damage to the environment and land. Open-pit mining, mining waste accumulation, ground collapse, etc. have produced a large number of mine wasteland, which has severely damaged the ecological environment of the mining area. The reclamation of abandoned mine land in China started late, and there is still a big gap compared with the international level.Therefore, it is necessary to fully excavate the production potential of mine wasteland, increase the utilization intensity of mine wasteland, improve the regional ecological environment, and promote the healthy and sustainable development of the regional national economy. This article summarizes the research status of abandoned land reclamation in the mining area and the impact of the polluted land in the mining area on the surrounding ecological environment, so as to put forward a sustainable development path from the perspective of the sewage discharge system of the mining area, mine reclamation, and soil remediation around the mine.
Research on Methods and Application of Remote Sensing Technology in Geological Hazard Monitoring and Management
Authors: Qu Tengfei , Tian Gen , Tang Mingxiu
Published: July 2020

In recent years, remote sensing technology has developed rapidly, and it has been increasingly used in the investigation and monitoring of geological hazards. Based on this, this article studies the research methods and applications of remote sensing technology in the monitoring and management of geological hazards. First introduced the concept of remote sensing technology and its advantages in information acquisition in disaster areas, and then briefly described the development process and current status of remote sensing technology. Then analyzed the research methods of remote sensing technology in geological disaster investigation, including the establishment of interpreted signs and interpretation of typical disasters in the survey area. Finally, the detailed application of remote sensing technology in earthquake and landslide disasters is explained in detail, and the future development direction of remote sensing technology in geological disasters is pointed out. Only continuous innovation and research can remote sensing technology be better used in disaster prevention and monitoring.
Analysis of long-term temperature monitoring data of a RCC dam in alpine region
Authors: Wu Hao , Cai Hao , Yan Junda , Zhao Chunlin , Zhang Shujun
Published: July 2020

Based on the monitoring data of a roller compacted concrete dam in an alpine region, the paper analyses the relationship between environmental factors and reservoir water temperature, dam body temperature and foundation temperature, and the changing law, so as to explore the actual internal temperature state of the dam, and provide useful technical support for the long-term safe operation of the dam.
Coal quality characteristics and coal accumulation patterns of seam No.4 at medium depth in Longting mining area, Weibei P-C Coalfield
Authors: Pan Chunjuan , Wang Hui , Fan Yuhai , Wang Junfeng , Cui Sheng
Published: July 2020

On the basis of collecting the latest exploration data of the study area, the authorsmade the research of the coal quality characteristics and coal accumulation patterns of seam No.4 at medium depth, which provided geological basis of the construction of high production and efficiency coal mine and the next coal resources exploration. The results show that the seam No.4 is black - brown-black, semi bright coal type, at the VII phase of the medium rank coal, high calorific value, easy to grind, nonagglutinating, noncoking and at the relatively high - high softening temperature gray level. The raw coal of seam No.4 generally belongs to middle ash coal, ash yield gets higher from south to north. It’s given priority to a low ash coal in the south and middle ash yield coalin the north. The seam No.4belongs tolow-sulfur coal, and shows “dumbbell” type in sulfur contour map, withthe basic characteristics of low in the middle, high on both east and west sides and higher in southwest, lower in northeast. The thickness and deposition range of the seam were controlled by ancient fluvial erosion after the coal-accumulating period around the Qiao8-11 holes in the south of study area and in the other area, during the coal-accumulating period were controlled by syndepositional structures.
Classification and treatment of urban domestic garbage in China
Authors: Fan Zhiguo , Meng Junru
Published: July 2020

In recent years, China’s urbanization and industrialization have developed rapidly. As cities continue to expand and people’s living standards continue to increase, the amount of domestic waste produced has also increased with each day, and has become more and more diversified, leading to prominent problems in urban waste disposal. With the rapid development of urbanization, the phenomenon of “garbage siege” has become increasingly prominent, and the living environment of residents has also gradually deteriorated. From the perspective of sustainable development strategies, strengthening the classification of urban waste is of great significance and will become a social Big development trend. The effective classification of garbage is not only good for the environment, but also beneficial to human beings. By comparing the current status of domestic garbage disposal at home and abroad, this article summarizes the problems of urban domestic garbage in China and gives a reasonable treatment plan.
Analysis of measures to improve the quality of atmospheric environmental monitoring
Authors: Wang Kai
Published: July 2020

With the continuous deterioration of environmental quality, environmental issues have become one of the important factors restricting China’s economic and social development. The levy of the environmental protection tax in 2018 is a major measure of the state in the governance of environmental issues. The theoretical analysis of taxes on environmental governance is particularly important. Environmental monitoring quality has a crucial impact on environmental management. Environmental monitoring is an important part of the environmental protection system. In the current environmental monitoring work, there are many factors that affect the quality of environmental monitoring, and these factors must be comprehensively and carefully analyzed. Pay sufficient attention to various factors affecting environmental monitoring, strengthen the management of environmental monitoring quality, and further improve the quality of environmental monitoring. This paper mainly analyzes and explores the influencing factors of the quality of environmental monitoring, and puts forward corresponding countermeasures based on this.
Study on the Relationship between Global Hurricane and Global Warming
Authors: Ma Xiaoyan , Fang Hong
Published: July 2020

In order to measure the intensity of global hurricanes, this paper selects the frequency ofhurricanes, the average grade and the mean wind speed as the indexes of intensity. Firstly, the annual hurricanes frequencies in the Atlantic Ocean, the Western Pacific, the East Pacific, the North Indian Ocean and the South Indian Ocean and the global average hurricanes scale and average wind speed, train the existing data through wavelet neural network and predict the occurrence frequency of hurricanes in the next 20 years. According to the scatter plot drawn from the known data, it is found that the global hurricane frequency, the average grade and theaverage speed of wind, which showing periodic changes, but generally increase. As a result,the intensity of global hurricanes has generally been enhanced in the current phase of observations.
Research on the problems and Countermeasures in the safety supervision of dangerous chemicals in Qingyang City
Authors: Sun Ning , Gai Ke , Wang Yipeng , Li Zhenhua , Chen Zhanjun
Published: July 2020

This paper mainly analyses the problems existing in the safety supervision of dangerous chemicals in Qingyang City, and further provides scientific and reasonable countermeasures for the existing problems, so as to effectively prevent and reduce the accidents of dangerous chemicals and ensure that people’s lives and properties are not threatened.
Study on the genetic characteristics of spring water in four spring groups of Jinan
Authors: Li Jiangbai , Xing Liting , Zhao Zhenhua , Li Changsuo , Wu Dongqiang , Meng Qinghan
Published: July 2020

In order to protect the four spring groups in Jinan, it is very important to study the formation characteristics of the karst spring in Jinan. Based on the geological and hydrogeological conditions of Jinan spring group outcropping area, this paper makes a comprehensive study on the karst aquifer void type, spring water supply source, spring water gushing state, spring water flow, spring water temperature and conductivity, spring water chemistry data in the recharging area, so as to determine the genetic types of four spring groups. The results are as follows: (1) Baotu spring and Heihu spring have a similar genetic structure, their circulation depth is relatively shallower, and they are greatly affected by Ordovician karst water in the direct recharging area. Tanxi spring and Pearl spring have a similar genetic structure with a deeper circulation depth, which are greatly affected by Cambrian karst water in the indirect recharging area. Tanxi spring and Pearl spring have a similar genetic structure with a deeper circulation depth, which are greatly affected by Cambrian karst water in the indirect recharging area; (2) Baotu spring and Heihu spring are long-running cold springs recharged by confined water, which belong to erosion rising spring; Pearl spring and Wulongtan are long-running large and medium-sized cold springs recharged by pressurized water, which belong to contact rising spring. The research on the genetic characteristics of spring provides a scientific basis for spring protection in Jinan.
Analysis of Global Warming Development Research -- Taking Scottish Fisheries as an Example
Authors: Zhang Jiahe
Published: July 2020

As the carbon emissions caused by human activities continue to increase, the greenhouse effect continues to increase, leading to global warming, which changes the global ocean temperature, and marine life migrates to future life and habitats that are easy to reproduce successfully. This is a company that depends on marine life the economy has caused severe impacts. This article focuses on the distribution of two fish populations that have significant economic contributions to the fisheries in Scotland, analyses the data related to global warming and climate factors, and further proposes a stable plan for the fishery economy in Scotland.
Impact Analysis of Supply-side Structural Reform on Sulfur Dioxide Emissions in Chengdu Based on Leap Model
Authors: Dong Xueyang , Li Hao , Wang Yuanyuan , He Shenkuan
Published: July 2020

In order to clarify the socio-economic pollution of the global atmospheric environment, as far as Chengdu is concerned, there is a lack of strategic scenario analysis of long-term changes in industrial sulfur dioxide emissions. Therefore, this article builds on Chengdu based on existing research. Based on the social development background from 2015 to 2025, the Leap model is used to evaluate the long-term impact of supply-side reforms on the sulfur dioxide emissions and emissions intensity of the Chengdu industry. This paper builds a Leap-Chengdu industry sulfur dioxide emission model, which predicts different scenarios and different scenarios. Different energy consumption between sectors, so as to predict the sulfur dioxide emissions and emissions intensity between different industrial sectors under different scenarios in Chengdu.
Knowledge Mapping on Literature Research Progress of Human Thermal Comfort in buildings Based on Web of Science
Authors: Cheng Xiang , Yang Lei , Cao Jian , Liang Dongyang , Song Gaoju
Published: July 2020

This study focused on hot topics and front of thermal comfort in buildings by knowledge mapping of 577 research papers from 2009 to 2019 in the database of Web of Science as samples. CiteSpace software was used as the analyzing tool. The results showed the trend of the published researches on thermal comfort by analyzing high-frequency co-occurrence keywords and the keywords’ frequency variation. The results also showed that the researches on thermal comfort about health had increased rapidly in recent years. Moreover, the institutions and authors involved in healthy indoor thermal environment were mostly from economically developed countries or regions. However, the productive author collaboration network had not been formed yet. Improving environmental quality is the forefront of current researches. The research of indoor environmental quality based on health may be a hot topic in the future.
Problems in the Prevention and Control of Urban Pollution and its Significance
Authors: Feng Caicai , Qiu Lijie , Zhang Lijuan
Published: July 2020

Since the beginning of the new century, with the continuous development of urbanization, the problem of urban pollution in China has gradually emerged. based on this, this paper probes into the present situation and prevention significance of urban environmental pollution. and according to the analysis of urban pollution problems, the corresponding design methods are given, so as to provide a clear direction for human beings in the prevention and control of urban pollution.
Parameter design of rotary kiln incinerator and application analysis in engineering cases
Authors: Liu Shiwen , Wang Fei , Wu Junwei
Published: July 2020

In this paper, according to the type and scale of hazardous waste incineration, process selection, design of rotary kiln incinerator, and the engineering principle and performance characteristics of rotary kiln incinerator system are analysed, and the proposed method is verified by practical engineering examples. The results showed that the temperature of rotary kiln is controlled at about 850 °C, the residence time of hazardous waste in rotary kiln is about 60min, the rotating speed is 0.88r/min, and the inclination angle is 1.75. The temperature of the second combustion chamber is more than 1100 °C, and the residence time of flue gas in the second combustion chamber is more than 2S. After continuous incineration, the reduction rate of slag ignition is less than 5%, the removal rate of fly ash is more than 99.99%, and the flue gas is discharged up to the standard.
Calibration of Air Quality Data Based on Multiple Regression Model
Authors: Zhang Hanping
Published: July 2020

According to the data of question D’s Annex 1 and Annex 2 of the National University Student Modeling Contest 2019, the correlation between the 6 air quality data errors and 5 meteorological factors at the self-built station is obtained by using the gray correlation method. Using the multiple linear regression method,and making the difference between the air quality data of the self-built station and the national control station as the dependent variable, and the meteorological data of the self-built station as the independent variables, six multiple regression equations were established to correct the air quality data of the self-built station.
Research on the Emission Inventory and Pollution Characteristics of Air Pollutants from Ships in Beijing-Tianjin-Hebei Area
Authors: Zhang Fan
Published: July 2020

As the key areas of China’s air pollution control, Beijing-Tianjin-Hebei region are the busiest sailing area for ships. Therefore, the impact of air pollution caused by ships cannot be ignored. The bottom-up “dynamic method” was used in this study and the ships’ navigation process was divided into three processes: docking, entering and exiting port and cruising, and the emission of air pollutants from ships was calculated respectively, and the calculation method of air pollutants emission inventory for ships with high temporal and spatial resolution was established. Based on the ships’ basic information data from maritime database of China Classification Society and Lloyd’s Register, the Automatic Identification System data and the emission factor data for ships, the emission inventory for ships in 2014 in Beijing-Tianjin-Hebei area was calculated. In addition, the study also analyzed emission share rate of air pollutants from ships and the uncertainty of emission inventory.
Comparison Studying of Concentrated and Traditional Infiltration of Rainfall Runoff in Sponge Cities
Authors: Guo Chao
Published: July 2020

Many studies have been conducted on the volume reduction and pollutants purification effect of low impact development (LID). However, the comparison between the concentrated infiltration and traditional infiltration of rainfall runoff has been rarely explored. In this study, the difference between concentrated and traditional infiltration mode in sponge cities is analyzed from water infiltration and pollutant purification. Then the infiltration mechanism and the pollutant adsorption, microbial degradation, plant absorption or accumulation processes are compared thoroughly. At last the future development direction of sponge city is also prospected. The conclusion of this study could provide scientific basis and theoretical support for the rational allocation and popularization of rainfall runoff infiltration measures, and promote the healthy development of sponge cities in China.
Study on New Seagrass Bed at the Coastal Area of Yellow River Estuary in Dong Ying
Authors: Zhou Ruijia , Zhao Sheng , Xu Donghui , Song Shuai , Jian Xiaoyang
Published: July 2020

Seagrass resource is an important part of the Marine ecosystem, eelgrass resources worldwide recession received extensive attention of the world. Through the tracking of Yellow River Estuary in Dong Ying, we found a piece of seaweed bed, new types of seaweed for short eelgrass (Zostera japonica Asch. et Graebn), which are mainly distributed in the intertidal zone. During the investigation, seaweed cover increases by 0.54 km2 to 0.54 km2. In the year to August 2015, the biomass is 322.13 g/m2, stem branch density of 794 plants/m2. The rise and fall of seaweed bed is closely related to the water environment changes. Through the study of multiple environmental factors influence on short eelgrass life state, we found that salinity has enormous influence on the growth of eelgrass. In the five salinity conditions which the temperature is 20 °C, the net oxygen production and the activity of ribulose-1, 5-diphosphate carboxylase were the highest when the salinity was 19.459, and the photosynthesis intensity decreased when the salinity was higher or lower than this value. According to the survey, from 2002 to 2014, the inflow of the Yellow River Estuary increased from less than 5 billion cubic meters to nearly 30 billion cubic meters. Therefore, the increase of the sea water amount of the Yellow River and the decrease of the salinity in the estuarine waters are the important reasons for the growth of the seagrass bed.
Threshold Effect and Regional Differences of Environmental Regulation on Carbon Emission
Authors: Yuan Qingmin , Yan Zhe
Published: July 2020

The increasingly serious environmental and climate problems have attracted the attention of many countries in the world. As a country with a large amount of carbon emissions, with the economic growth, the pressure of carbon emission reduction is increasing. Starting from the basic issue of the impact of environmental regulation on carbon emissions, this paper takes energy intensity, industrial structure and FDI as threshold variables, environmental regulation as the core explanatory variables, and uses the panel threshold model to analyze the threshold effect of environmental regulation on carbon emissions in China and the regional differences in the East, middle and West.
Application of Energy-saving and Emission-reducing Technology in Street Lights in Citizens’ Exercise Areas
Authors: Yu Tianbo , Ji Lei , Liu Wei
Published: July 2020

At this stage, research and development and use of energy-saving and environmental protection technologies are increasingly widespread. Especially in recent years, China has put forward a sustainable development strategy. The author has carried out a retrofit study on the urban street lighting system and transformed the urban lighting system. This paper proposes to build a professional and energy-efficient urban street lighting that meets the standards of energy conservation and environmental protection System, and specifically proposed a new type of lighting system, which can effectively reduce the energy consumption of power supply, effectively provide power supply when suppressing reactive power, and rebuild the circuit, in the street light After the system was applied to the residents’ sports area, we found that it has the advantages of low running cost, easy expansion and convenient maintenance.
Thermal modeling and measurement of a drive motor in a pure electric vehicle
Authors: Zhu Linpei , Chen Hu , Xiong Fei , Liu Xiong , Kong Ninghua
Published: July 2020

This research is concerned on the thermal modeling and measurement of an electric drive motor. The motor is a high-efficiency permanent magnet synchronous motor (PMSM) and is actively cooled by circulating coolant through a water jacket. A lumped-parameter thermal network (LPTN) based on the Amesim is established for thermal modeling, and the temperature histories of rotor and copper winding are obtained in a condition of 120kph@3% grade. Slip ring is employed to handle the problem of effectively testing the temperature of motor rotor. The LPTN thermal model is validated by comparing simulation results with the test ones. Based on this equivalent thermal model, temperature distribution along axial direction of the motor can be obtained. The proposed LPTN model is useful for motor design to avoid over heat and demagnetization.
Study of Short-term Load Forecasting Based on PSO-SVR
Authors: Gu Jing , Zhao Dazhou , Ruan Jiongming
Published: July 2020

Support vector machine (SVM) algorithm was used to predict the energy load of an energy station in Shanghai, including hourly and half-day load two parts. The input parameters were the outdoor temperature, the air relative humidity, the temperature difference between the supply and return water and the flow of the supply water at the moment, adding the load at the last moment. The output parameter was the load at the moment. The results showed that the predicted value was in good agreement with the measured value. The average absolute errors of all results were less than 1.5, and the average relative errors were less than 3.
Research Progress of Lithium-Ion Battery Current Collectors
Authors: Li Yaopeng
Published: July 2020

The current collector is one of the important components of a lithium-ion battery. It can not only carry the electrode active material, but also collect the current generated by the electrode active material to form a larger current output, which improves the charge / discharge efficiency of the lithium-ion battery. This article reviews the current research progress of single or composite current collector materials such as copper, aluminum, nickel, stainless steel, carbon, and carbon-coated aluminum foil in lithium-ion batteries.
Quantitative analysis of coal resources in Qingyang City
Authors: Gai Ke , Hao Zhifu , Qi Huili , Sun Ning , Zhenghua Li
Published: July 2020

Qingyang City is rich in coal resources, bringing great economic benefits, but also accompanied by soot-type air pollution. This paper takes hetaoyu mine and tianshuibao coal mine as the research object, and systematically analyzes the coal resources. Master the characteristics of coal quality, coal rock and coal resources. Taking the sustainable development of the green coal economy as the direction, from the source to change the current coal development process caused by the waste of resources, the deterioration of the ecological environment and environmental pollution.
Analysis of short circuit electromagnetic force of salient pole synchronous motor winding
Authors: Shen Yubo , Zhang Dewen , Xu Minhu , Kong Fanrong , Zhang Peng , Chen Shiyu , Shang Shulei , Zhao Xiangyu
Published: July 2020

China’s pumped storage power station has a broad prospect, in which salient pole synchronous motor plays an important role. In this paper, the mathematical expression of electromagnetic force in the case of short circuit of the excitation winding of salient pole synchronous motor is derived, and the variation law of electromagnetic force density in the case of fault corresponding to the electromagnetic force of damping winding is calculated. The mathematical law of electromagnetic force in the case of short circuit fault of salient pole synchronous motor is revealed, which has practical reference significance.
Research on early warning method of coil temperature of emergency diesel generator set in nuclear power station
Authors: Liu Jihua , Dai Fangzheng , Zhu Lei , Chang Xincai
Published: July 2020

As the last back-up supply of the nuclear power supply system, it is of great significance to ensure the safety and reliability of the nuclear emergency diesel power unit. For the emergency diesel generator set of nuclear power plant, the various signal types of diesel generator set are quasi periodic non-stationary signals, which make the diesel generator set have the characteristics of complex fault mechanism, difficult to collect and process all kinds of signals in a unified way, and difficult to extract fault features. The main purpose of this paper is to provide an early warning method and system for the coil temperature of diesel generator set in nuclear power station. By building a synchronous collection system for the coil temperature of diesel generator set, the collected coil temperature is counted in real time, and the abnormal analysis is carried out according to the real-time predicted value, and the early warning is carried out in time in case of any abnormality, so as to ensure the normal operation of diesel generator set.
Research on the Planning Strategy and Layout Pattern of Electricity Grids in Megacities from the Perspective of Urban Planning
Authors: Cheng Jinmin , Zhao Jing , Peng Wei
Published: July 2020

In light of the advancement of urbanization and the development of digital and intelligent technologies, urban power consumption has shown a continuous and rapidly increasing trend, which makes power supply and its protection key issues in terms of further urban development. Given this context, the electric power system per se has likewise been undergoing continuous improvement and change, with many efforts directed toward AC-to-DC conversion for electricity transmission. As such, the new measures applied in urban areas inevitably face the challenge with regard to coexisting with the existing urban systems. On the one hand, electricity grids, as important infrastructure of urban power supply systems, play a key role in supporting modern urban life. On the other hand, the traditional planning methods, solely relying on electricity load forecasting and load nodes, results in a certain degree of inconsistency and conflict between the electricity grid planning and the Master Urban Plan, thereby leading to serious negative impacts of the electricity grid layout on urban space quality. Given this context, this article reflected on the limitations of the traditional electricity grid layout and planning methods by analyzing the current situation and the needs of urban space development. Subsequently, relevant planning theories were combined to explore strategies and models for the planning and layout of electricity grids and related facilities in megacities based on comprehensive consideration of power security, power safety, not-in-my-backyard mentality, urban development needs, and urban space quality, in order to achieve harmonious coexistence of electricity grid construction with urban-rural space.
Research on Improved Droop Control of AC-DC Microgrid Bidirectional Converter Based on Power
Authors: Cai Wenchao , Gao Min , Jia Junqing , Lv Chao , Guo Shan , Li He , Yang Yang
Published: July 2020

The bidirectional converter in AC / DC hybrid microgrid is an important link to balance the power on both sides of AC and DC, Its control method is extremely important. This paper proposes an improved droop control strategy for bidirectional converter using DC-side power amount control. This control can autonomously and smoothly switch in rectifyer, inverter and idle modes. Utilizing DC-side power control avoids normalized calculations. Strategy meets two modes of island and grid connection, eliminating the need for multiple control strategy switches. Simulation results show that the DC bus voltage and AC frequency are near the rated value, which guarantees the stable operation of the AC-DC hybrid microgrid.
Study on the Unified Data of Power Regulation System for Guizhou Power Grid
Authors: Xiao Qianhong , Du Jiang , Zhang Yao , Chen Jinlong , Chen Zhuo
Published: July 2020

The grid structure of the Guizhou Power Grid is becoming more and more complex, and the deepening of regulatory integration has made the information and work of regulators more and more onerous. Combining artificial intelligence, big data technology and grid control business is an inevitable trend of development. In this paper, a unified data model of the power system is established based on the Guizhou power grid’s regulatory operation requirements. It can analyze the impact of big data on dispatching business and define the power business demand model in the big data environment. This model also integrates and manages the multi-source heterogeneous data of power grid business by reflecting data and relationships of power regulation business. The research results are of great significance to improve the level of safe and stable operation of the power grid, and to promote intelligent operation of regulation and control, and also lay a solid foundation for intelligent dispatch.
Research on Key Technologies of New Energy Microgrid Based on Artificial Neural Network
Authors: Zhang Hongxin
Published: July 2020

The new energy microgrid is a new and complex power generation and distribution system. Due to the instability of the new energy wind power generation that constitutes the microgrid, it affects the stable operation of the microgrid. The use of artificial intelligence methods to predict load and wind power generation can improve forecast accuracy, which is beneficial to the energy management and operation optimization of the microgrid. The stable operation of the microgrid is of great significance. This paper takes the new energy microgrid as the research object, and uses artificial intelligence neural network as the technology drive. The short-term load forecasting model and wind power generation forecasting model based on neural network are established. Compared with the traditional forecasting model, the future short-term load and wind power generation are compared respectively. The accuracy of the proposed method is verified by the prediction of the measured quantities. The results show that both the short-term load forecasting method based on neural networks and the forecasting method of wind power generation are suitable for new energy microgrid systems.
Review on operation and maintenance management technology of smart photovoltaic micro grid in plateau cold area
Authors: Pu Zewei
Published: July 2020

Energy crisis and environmental pollution are more and more concerned. The smart photovoltaic micro grid system is in the stage of rapid development because of its clean solar energy as the power source, which has been strongly supported by national policies. Based on a brief summary of the operation and maintenance management technology characteristics of smart micro grid in the United States, the European Union and China’s plateau cold region, this paper analyzes the key parts of smart photovoltaic micro grid system: energy consumption management, system control and system protection. It provides a theoretical reference for the follow-up research.
Synthesis of Mesoporous ZSM-5 Zeolite and Its Adsorption Properties for VOCs
Authors: Huang Daojian , Hu Xiaomei , Zhao Cheng , Wu Yi , Zhou Jinlei , Liu Chengxian , Yun Junge , Chen Dingsheng , Dai Jiqiang , Cen Chaoping , Chen Zhihang
Published: July 2020

A composite template method was used to synthesize a ZSM-5 molecular sieve containing intracrystalline mesopores. In this paper, the charge ratio and the amount of mesoporous template have been set as variables. The synthesized samples were characterized through XRD, TEM and BET and its absorption performance of toluene has been qualitatively analyzed. The results showed that the synthesis of ZSM-5 structure required a suitable charge ratio and the amount of composite templating agent. The specific surface area of molecular sieve with ZSM-5 structure can be up to 499 m2/g, which charge ratio was 0.8. Besides, the maximum of adsorption amount of static adsorption and adsorption rate of dynamic adsorption were 265 mg/g and 16.75% respectively.
Research on the Influence of Circulating Cooling Water on Electrochemical Scale Inhibition
Authors: Geng Man , Zhong Shaotao , Wang Guangwu , Cui Pengfei , Chen Dingsheng
Published: July 2020

Electrochemical water treatment technology can effectively prevent the formation of scales. In this paper, the electrochemical workstation is used to explore the process of cathode scale formation and its influencing factors under different conditions. The results show that the electrochemical scale inhibition can effectively remove Ca2 + and Mg2 + in water. When it comes to scale inhibition, and it provides theoretical analysis and experimental basis for solving the scaling problem of the external cold spray water of the high-voltage DC valve cooling system.
Effect of Dust Fall in an Emerging Industrial City on the Growth of Eichhornia Crassipes
Authors: Liao Shaohua , Zhao Ya , Li Wencai , Yang Lu
Published: July 2020

PM2.5 is the focus of current research, but the dust fall seems relatively insignificant. The effect of dust fall on the growth of Eichhornia Crassipes was studied in this paper. Through macroscopic experiments, the apparent characteristics of Eichhornia Crassipes before and after dust fall, including weight increase, root length and leaf number, were studied. At the same time, the changes of pH value, TP and TP of Eichhornia Crassipes in water environment before and after dust fall were studied. The change of pH value was not significant, but dust fall strongly inhibited the absorption of TP and TN by Eichhornia Crassipes. The dust fall contains nutrients such as C, N, P, Cu and Zn required for plant growth, however, the positive effects of the nutrient elements provided by dust fall on the growth of Eichhornia Crassipes were smaller than the negative effects on the quality, root length and leaves of plants. The results of Evans blue staining showed that the cells of Eichhornia Crassipes were obviously damaged by dust fall at the cellular level. The heavy metals (such as Cu and Pb) in the dust fall may play an important role for the negative effects of this test.
Investigation Report on the Effects of Selenium on Human Health in Guanzhong Area
Authors: Li Aorui , Qiao Xinxing , Ji Huawei , Ren Rui
Published: July 2020

120 respondents which from selenium-rich and selenium-poor areas respectively were investigated and analyzed by means of questionnaire survey and statistical analysis to study the relationship between soil selenium level and human health in GuanZhong area, shaanxi province. Studies have shown that the incidence of diabetes (X

2
= 4.25, P < 0.05), coronary heart disease (X

2
= 4.63, P < 0.05) and gastritis (X

2
= 6.67, P < 0.01) in selenium-poor areas in GuanZhong area, shaanxi province is significantly higher than that in selenium-rich areas. It is urgent to adjust the dietary habits in the selenium-poor areas, and pay attention to proper intake of selenium-rich food in daily diet, so as to prevent and treat the related diseases caused by selenium deficiency.