bluuebunny/crossref_metadata_2025 huggingface dataset:
Brittleness Evaluation of Chang7 Reservoir in Longdong Area Based on Mechanical Parameters and Stress-strain
Authors: Li Zhenhua , Zhang Suya , Cao Feng
Published: July 2020

Brittleness determines the effect of reservoir fracturing and is the key to improve unconventional oil and gas production. In order to accurately understand the brittleness and fracture parameters of the reservoir, triaxial compression test and stress-strain analysis were carried out on the Chang 7 rock samples from well N-1 and well Z-1 in Longdong area of Ordos basin, based on which, the brittleness index was calculated. The results show that the brittleness index calculated by stress-strain method is 51.95%-52.96% and by mechanical parameters method is 57.2%-57.5%; the brittleness index is high, indicating that chang7 reservoir in Longdong area has high brittleness, which is conducive to later fracturing.
Design and numerical simulation of a self-adaptive variable-diameter robot for in-pipe non-destructive inspection
Authors: Ling Zhangwei , Yu Xuefen , Yan Sunting , Chen Yonggui
Published: July 2020

This paper presents a design method and numerical simulation result of an smart in-pipe inspection robot with capability of adjusting its diameter to adapt to pipelines of non-constant inner diameter insensitive to non-smooth imperfect inner surface due to corrosion or erosion. A variable-diameter component consisting of a motor, gear wheels, a screw and nut drive system and a bar linkage is introduced to achieve this self-adaption. Moreover this paper presents a force-balance analysis by virtual displacement principle relating the normal force and internal spring force and conducts a numerical simulation of dynamic process of a 3D mechanical model across diameter-varying sections in horizontal, vertical manners and records transient inner spring force. The paper has significant reference merit for engineering application to ensure safe operation of pipelines.
Analysis and research on coal quality in Hetaoyu coal mine
Authors: Gai Ke , Tang Jiayao , Qi Huili , Zhang Kejun , Zhang Yuquan
Published: July 2020

In this paper, industrial analysis and element analysis were used to determine the quality of coal after the determination of various indicators, then hetaoyu coal quality was determined. It is found that the coal in this area is characterized by extremely low total moisture, low ash, medium and high volatile content, high calorific value, high caloric value, and low sulfur content. It is beneficial to realize the comprehensive utilization of clean, efficient, low-carbon and energy-saving coal.
Study on Sealing Technology of Gas Drainage Borehole under Damage of Surrounding Rock in Deep Mine Roadway
Authors: Yuan Benqing , Xu Zunyu
Published: July 2020

In order to solve the problems of poor drainage effect and low efficiency caused by poor sealing quality of deep gas drainage boreholes, based on the gas geological conditions in Huainan mining area, comprehensive theoretical analysis and field engineering practice, the distribution law of surrounding rock fracture zone in different lithologic roadways was studied, and the sealing technology combining pressure grouting, screen pipe protection and deep and shallow hole grouting was put forward. Field tests showed that the technology was effective. The average gas extraction concentration and hundred hole extraction purity of boreholes are 3.75 times and 3 times higher than those of common boreholes respectively, and the field application effect is remarkable.
Efficient Management and Application of Mine Fire Prevention Data
Authors: Xu Zunyu , Yuan Benqing
Published: July 2020

In view of the current monitoring and effect investigation of coal seam fire prevention measures and technologies, it has the characteristics of numerous on-site observation points, large data volume, poor effectiveness and low efficiency, which brings great difficulties to the analysis of coal seam fire prevention situation. In this paper, the arrangement of observation points of coal seam fire prevention measures or technical requirements is combined with the result of fire prevention data processing to avoid the isolation of fire prevention data analysis. It can directly show the data, curve and changing trend of coal seam fire prevention and extinguishing in the measuring point layout. It can timely and effectively put forward the corresponding coal seam fire prevention measures to improve the mine fire prevention management measures.
Analysis of Outburst Disaster Characteristics and Countermeasures of 3# Coal Seam in Hancheng Mining Area
Authors: Ji Fei
Published: July 2020

In view of the current situation of 3# coal seam with large thickness, high gas pressure and content, weak coal seam, poor permeability and serious coal and gas dynamic disasters in the mining area, this paper combs and deeply analyzes the gas geological occurrence law and the characteristics of gas dynamic disasters in Hancheng mining area. The research results show that the gas disaster of 3# coal seam in Hancheng mining area is mainly the instantaneous outburst caused by the structural stress based on the high ground stress and the mining stress concentration, and the creep time-delay Outburst under the quasi-static load based on the high ground stress will occur in some abnormal soft areas. Based on this, the paper puts forward to strengthen the geological exploration work, and to prevent and control the coal and the coal from the aspects of gas drainage and stress removal The technical thinking of gas outburst disaster provides theoretical guidance for the prevention and control of gas dynamic disaster in mining area.
Study on the main influencing factors of oil-flood recovery factor of oilfield in extra-high water cut period
Authors: Wang Gang
Published: July 2020

Recovery factor is the most important comprehensive index to measure oilfield development effect and development level. Starting from the production history data of development indicators and influencing factors, this paper mainly evaluates the oilfield development effect from the transient perspective of recovery factor. The results show that the current recovery rate is higher but the recovery factor is lower. Mathematical methods such as gray correlation analysis and reservoir engineering principles analyze the main factors that affect oil recovery and oil recovery rate. According to the current recovery factor determined by the dynamic method according to the determined typical block, compared with the similar typical block, the four influencing factors are analyzed longitudinally from the historical change trend, and the next step to improve the recovery rate of the block is given. Main adjustment countermeasures. The proposed method and analysis results have certain reference value for the theoretical research and practical application of the development of ultra-high water cut oil fields.
The Research about Back Pressure and Permeability of Heterogeneous Core Affecting Fractional Flow Rate of Plugging Agent
Authors: Chen Yufang , Dong Yanan , Guo Zhiqiang , Li Peijing , Zhang Zufeng , Wei Xiaomin , Zhou Fushuang , Li Xuewei
Published: July 2020

In order to improve the selective plugging effect of high pressure layer which was during the process of commingled chemical water plugging in heterogeneous layer. This paper carried out the parallel core group experiment to research influence of back pressure and permeability contrast affecting fractional flow rate of acrylic plugging agent. The experimental results show that for parallel core group with different permeability contrast, with increased of pressure difference, fractional flow rate of the low pressure core gradually increased, indicating that inter-layer pressure difference in core group was main factor affecting fractional flow rate. With pressure difference increased from 0 MPa to 2 MPa, fractional flow rate of low pressure core gradually increased from 0 to 100% when permeability contrast is 12.55, fractional flow rate of low pressure core increased from 0 to 31.5% when permeability contrast is 105.5, fractional flow rate of low-pressure core increased from 0 to 10.5% when permeability contrast is 333.3. According to the experimental results, this paper proposed a proposal for selectively plugging high pressure layer in heterogeneous layer with inter-layer pressure difference and permeability contrast, that is, when permeability contrast was less than 105.5, temporary plugging agent should be injected to plug low pressure layer temporarily, and then water plugging agent was injected to plug high pressure layer. The lab experimental results show that after temporary plugging agent was injected, fractional flow rate of high pressure core increased from 0 to 98.8%, and fractional flow rate of low pressure core decreased from 100% to 1.2%, which achieved experimental purpose of selectively plugging high pressure core.
Intervisibility calculation model of monitoring hole and optimization of device installation position
Authors: Yin Kun , Liu Zhenxing , Song Jialiang , Li Zehan , Liao Hongbo , Chen Zhongkai
Published: July 2020

Aiming at the laser monitoring of the strain of the underground pile foundation of buildings, this paper establishes the intervisibility calculation model of a single monitoring hole, and optimizes the installation position of the monitoring device. The results show that the calculation results of the model are basically consistent with the measured data, which solves the problem of repeatedly adjusting the laser when measuring the maximum intervisibility in the past. Finally, the sum of the maximum intervisibility of all monitoring holes is significantly increased by optimizing the installation position.
Study on Petroleum Standard Attention Index Calculation based on the Entropy Weight Method
Authors: Xu Ting , Qin Changyi , Zhang Hua , Qu Yixin , Fang Wei
Published: July 2020

In this paper, the author analyzes and delves specialty distribution, attributes, attention, and other information about China’s national standards in the petroleum industry on the basis of quantitative statistics on such standards and research on attention therefor. The Entropy Weight Method (EWM) is then applied to make comprehensive measurement from three indexes of standard details query clicks, online reading clicks and download clicks, with standard attention index and corresponding ranking obtained, providing a basis for comprehensive understanding of standardization development status and trend of the petroleum industry in China.
Research and application of pre-draining coal seam gas technology with three-dimensional cross drilling
Authors: Yang Liping
Published: July 2020

In view of the current situation of low extraction efficiency and poor extraction efficiency of Yangquan No.5 mine 15# coal seam in, in order to ensure the daily safe and efficient production of coal mines, the three-dimensional cross-drilling technology was used to conduct field test on the drainage effect of the bedding in the 8401 working face, and compared with the gas drainage technology of traditional drilling arrangement methods such as plane cross hole and parallel hole arrangement. The result shows that after the gas extraction of the three-dimensional cross-drilled hole in the 8401 working face, the average extraction volume per 100 meters reaches 0.0097m3/min.hm, the attenuation coefficient is 0.0725d−1, and the extraction effect is better than that of the plane-intersecting holes and the parallel arrangement of holes, which effectively reduces the occurrence of coal mine accidents and opens up a new technical way for coal mine gas drainage.
Research on Pressure Controls of High Pressure Tubing Based on Simulation Model
Authors: Hou Xiaodan , Li Xiaorong
Published: July 2020

High pressure oil pipeline is the basic component of many fuel engines, and it has great application and development value in transportation, aerospace and other national defense military. This paper examines ways to control the pressure change in the high pressure tubing under the condition of intermittent fuel entry and ejection. On the basis of determining the balance equation of each part of the injection system, this paper presents different design schemes of the high pressure fuel system under different operating parameters of the high pressure tubing by establishing the simulation model.
Research on Sensor Correction Method for Monitoring in Early Warning System of Coal Spontaneous Combustion
Authors: Deng Jun , Liang Ce , Chen Weile , Zhao Jiaxiang , Yao Hanwen
Published: July 2020

According to statistics, there are as many as 4000 coal spontaneous combustion accidents every year, causing heavy casualties and property losses. By accurately detecting the change of index gas concentration, it can provide reliable criteria for identifying and warning the early hidden dangers of coal spontaneous combustion. The improvement of sensor precision is the basis of intelligent monitoring. Modification of wireless multi-parameter sensor used in coal mine is of great significance for accurate monitoring of gas concentration in coal mine. In order to modify the wireless multi-parameter sensor, the high and low temperature experiments of the sensor were carried out at -5∼45°C, and the real values of O2 concentration at 15%, 21%, 25% and CO concentration at 175ppm, 250ppm and 375ppm were measured. Measurement data was Non-linear fitting and correction by using SVM (Support Vector Machine), BP neural network and Elastic Network regression method. The experimental results show that the Elastic Network regression compensation reduces the O2 sensor from the original maximum mean absolute percentage error (MAPE) of 18.4% to 0.52%, and the average MAPE decreases from 13.89% to 0.21%. Using the SVM nonlinear compensation, the CO sensor is reduced from the original maximum MAPE of 43.2% to 1.6%, and the average MAPE is reduced from 21.38% to 1.4%. Elastic Network regression compensation excellent achieves nonlinear compensation of O2 sensor. The SVM better realizes the nonlinear compensation of the CO sensor. Through non-linear compensation, wireless multi-parameter sensor can better meet the requirements of coal mine gas concentration monitoring.
Application of Source-to-Sink System in the Prospect Analysis in Early Stage of Sandstone Uranium Exploration
Authors: He Feng , Zhang Zilong , Liu Hongxu , Jia Cui
Published: July 2020

In-situ leaching sandstone uranium deposit has the advantages of low mining cost and environmentally friendly. The research ideas from “source” to “sink” are applied to the study of the mineralization of sandstone-hosted uranium deposits. Prospect areas are predicted by studying the source-sink system of sandstone uranium deposits. Soil radon survey is carried out in prospect areas to delineate the abnormal range of soil radon and to reduce the scope of the favorable exploration area. Accurately determining the exploration area is conducive to reduce the damage to vegetation and environment in the exploration area, and to achieve the goal of green exploration.
Study on Soil Quality Improvement in Weibei Taiyuan District
Authors: Cao Tingting , Li Juan , Shi Chendi , Sun Xubo
Published: July 2020

In order to fully understand the spatial change characteristics of soil quality after land remediation in Weibei Taihe District, this paper takes Long County, Weibei Taihe District as an example, selects some project areas after land remediation, conducts soil nutrient testing, and studies the organic matter and nitrogen, phosphorus, and potassium in the soil. The distribution characteristics of soil and the quality of soil were graded. The scientific evaluation of the quality of newly cultivated land in the area after land remediation showed that, except for the organic matter content in the land remediation area of Dingma Village, other indicators and other The regional indicators are in compliance with the standards. According to the traditional fertility improvement methods, the soil organic matter content is lower than the standard. The organic matter can be improved by applying organic fertilizer and promoting the return of straw to the field. It is suggested that through the combination of cultivated land and cultivated land, crop rotation and stubble should be implemented to ensure balanced supply of nutrients to the newly-added cultivated land so that the development of cultivated land can achieve sustainable, stable and high yield.
Verification and confirmation of ICP-MS method for determination of As, Zn and Cr in water
Authors: Sun Sha , Zhang Yabo
Published: July 2020

According to the standard method of “Determination of 65 Elements in Water by Inductively Coupled Plasma Mass Spectrometry” (HJ 700-2014), the verification and confirmation of ability of detecting As, Zn and Cr in water were conducted in laboratory. Each element has a good linear relationship in the concentration range of 0 to 500 μg/L, and the correlation coefficients are all greater than 0.999. The laboratory detection limit of As, Zn and Cr was 0.06 μg/L, 0.29 μg/L and 0.03 μg/L, respectively. Which meet the requirements of corresponding detection limit in standard method (As detection limit: 0.12μg/L, Zn detection limit: 0.67 μg/L, Cr detection limit: 0.11 μg/L); In the verification of experimental precision and accuracy, the relative deviation is 2.59%∼10.1%, the recovery rate is 94.7%∼109%, which are all meets the standard requirements of relative deviation should less than 20%, the recovery rate should be 80%∼120%. The results confirmed that our laboratory possess the ability using ICP-MS to detect As, Zn and Cr in water.
Effect of temperature on the determination of available phosphorus in soil in northern China
Authors: Zhang Haiou , Shi Chengdi , Lu Yangjie
Published: July 2020

The determination results of soil available phosphorus at different temperatures are greatly affected, in order to study the correlation between temperature and soil available phosphorus and the correlation coefficient. In this experiment, according to the determination method of available phosphorus in neutral and calcareous soil, the effect of different color rendering temperature on available phosphorus content in alkaline soil in northern China was studied. The results show that when the available P is measured, the suitable color temperature is 25∼30°C; At 25°C as the standard, the soil available P values reached a very significant positive correlation at different temperatures, and the correlation coefficients were 0.983**, 0.991**, 0.996** and 0.988**, respectively.
Analysis on Log Response Characteristics of Oil Shale and In-situ Mining Geological Evaluation in Qingshankou Formation of South of Songliao Basin
Authors: Tan Guihua
Published: July 2020

In order to study the log response characteristics of oil shale in Qingshankou formation of the south of Songliao basin, the geology of in-situ mining of oil shale in this area is preliminarily evaluated, so as to provide scientific basis for in-situ mining of oil shale in this area. Based on the log response principle of oil shale, the Qingshankou formation oil shale in this area is identified qualitatively, and the in-situ geological parameters of oil shale are analyzed in combination with the characteristics of oil shale. The results show that the oil shale of Qingshankou formation in the south of Songliao basin is with the log response characteristics of high natural gamma, high resistivity, high acoustic time difference, and low density, and the organic carbon owns the best correlation with resistivity and density logs. Through analysis of the geological parameters affecting in-situ oil shale mining, the geological parameters affecting in-situ oil shale mining include oil content, thickness, burial depth, mineral type and its content, organic matter type and its maturity, water content, sulfur content, rock assemblage characteristics, ore body distribution characteristics, and dip distribution characteristics, etc.
Rheological test of soft hard interbedded rock mass
Authors: Han Bing , Fu Qiang , Li Jing , Yu Fan
Published: July 2020

The effect of stress level and loading path on rehological behavior of alternating distribution of soft and hard rock layers are investigated with triaxial creep and uniaxial experiments. The results have shown that Different stress states and loading paths have some influence on the rheological behavior of the rock mass. The creep displacement of the rock mass is increased and the lower the confining pressure is, the more obvious the rheological property of the rock mass is, which indicates that the confining pressure has a certain inhibitory effect on the rheology of rock mass.
Petroleum exploration potential of the Mid-Norway Continental Margin
Authors: Fan Yuhai , Wang Hui , Qu Hongjun , Pan Chunjuan , Zhang Gongcheng , Tan Furong
Published: July 2020

The deepwater basins in the Mid-Norway Continental Margin of North Atlantic continental shelf is one of the hot spots of global petroleum exploration in deepwater area,and its exploration potential is very large. On the basis of synthesizing regional geologic information and the earlier researches of the Mid-Norway Continental Margin, guided by leading edging theories of Reservoir Sedimentology, Petroleum Geology, we found that main source rocks occur in the Upper Jurassic marine shale of Spekk Formation. The main reservoir is shallow marine sandstone of Fangst group of the Middle Jurassic rift stage. Petroleum migration through two ways: petroleum migrate a little distance by means of the cracks, grooming, faults a short distance, and pass through unconformity surfaces or connected sand bodies migrate a long distance,and and eventually into the reservoir. The Mid-Norway Continental Margin is rich in hydrocarbon,its reserve reaches about 73.2 billion barrels of oil equivalent and the undiscovered fields may be up to 36.
Long-term wave prediction and analysis based on time-series analysis
Authors: Liu Liangliang , Huang Shuting , Liu Yanjun
Published: July 2020

The efficiency of the oscillating float-type wave energy devices is closely related to the wave conditions in its working area. Seasonal changes in actual sea conditions are obvious, and they vary greatly throughout the year. Therefore, it is necessary to analyse and predict the wave, and adjust the oscillating float-type wave energy device’s parameters according to the wave conditions to improve the efficiency. Based on the analysis of the long-term wave variation and the short-term stationary characteristics of the wave, the moving regression algorithm is used to predict the wave. Adjust the device parameters according to the wave condition prediction data, and match the wave power and load power to achieve a certain efficiency in the wide power range of the device. The research results can be used for variable load control of wave energy devices.
Study on the Impact of Mineral Resources Exploitation around Cities on Resident Movement and Health Monitoring System
Authors: Cheng Peng , Yang Xudong , Yu Tanbo
Published: July 2020

As a non-renewable resource, mineral resources occupy a very important role in human production and life. They are closely related to human beings. This article aims to analyse the status of mineral resource development and the distribution of mineral resources, and expound Relevant geological environment of the mine where the resource is located and some accompanying hazards, and put forward relevant suggestions and specific measures to protect the geological environment in view of the problems found. From the improvement of the utilization rate of minerals, the implementation of mine environmental protection and environmental supervision and other methods to protect the geological environment, I hope that we can provide some suggestions to our country on address environmental protection and development and utilization of mineral resources.
Research on the Utilization of Waste Resources of SMEs Based on Low Carbon Background
Authors: Lin Renzao
Published: July 2020

The core content of low-carbon is low-carbon economy and low-carbon life. Circular economy is a production mode of low-carbon economy. The utilization of waste resources of SMEs’ reverse logistics is a way to promote circular economy. The use of waste resources has the problems of low recycling rate of packaging materials, non-standard recycling of waste materials, high cost of return and transportation, and serious environmental pollution. In order to achieve sustainable development, implement the concept of a low-carbon economy and develop green logistics, it is necessary to take measures to improve the recycling rate of packaging materials, improve corporate social responsibility, reduce the cost of return logistics, and prevent environmental pollution to promote the improvement of reverse logistics for SMEs Utilization of waste resources.
Predicament and Elimination of Beijing-Tianjin-Hebei Cooperative Air Pollution Control
Authors: Li Zhe
Published: July 2020

The Beijing-Tianjin-Hebei air pollution collaborative governance still has difficulties such as insufficient willingness to participate actively, opportunistic behavior, and lack of stable and coordinated cooperation. By comparing the theoretical implications of collaborative governance and the reality of air pollution control in Beijing, Tianjin, and Hebei, the causes of the dilemma are explained from three levels: relationship networks, action strategies, and governance structures: stress-type relationships between central and local governments, and “strong-Chinese” “Weak” development pattern and asymmetric resource dependence between government and enterprises lead to insufficient participation of local governments and enterprises; it is difficult for the actors to reach consensus on action strategies based on the “benefit-risk” analysis, making it easier for local governments and enterprises Opportunistic behaviors and inability to participate effectively in governance; the “pyramid” governance structure between central and local governments, the governance structure with insufficient communication and coordination between local governments, and the lack of incentives between government and enterprises affect the stability and cooperation of collaborative governance Coordination. In the future, it is necessary to eliminate the predicament of coordinated governance of air pollution in Beijing, Tianjin and Hebei, and promote air pollution through clear division of authority between central and local governments, effective communication and coordination of collaboration groups, improvement of income distribution and risk sharing mechanisms, and construction of selective incentive mechanisms. Effective problem solving.
Research on the Evaluation Index of Air Pollution Control Audit Based on PSR Model
Authors: Du Wenyan
Published: July 2020

Since the reform and opening up, China’s economy has achieved high-speed growth. However, due to the extensive economic growth mode and the limited level of technical conditions, air pollution has become a serious problem, endangering the natural environment and human health. In order to speed up the improvement of ambient air quality, Chinese government continues to carry out air pollution control actions. This paper analyzes the current situation of air pollution control in China, and constructs an evaluation index system of air pollution control audit based on PSR model in combination with the characteristics of air resources.
Classification and Risk Identification of Forest Ecology Based on Statistical Learning
Authors: Sun Xuan , Lei Ting
Published: July 2020

In this paper, the forest ecosystem classification and risk identification are studied based on statistical learning methods such as cluster analysis and discriminant analysis, taking Daxinganling Forest in Inner Mongolia, Beijing Forest, Jilin Changbai Mountain Forest, Hubei Huitong Forest, Guangdong Heshan Forest, and Linzhi Forest as the research objects. The results show that: (1) The classification of forest ecosystem activity is mainly determined by the forest species. At the same time, the composition and growth of forest species is an important basis for risk classification. (2) Climate factors and soil factors affect forest ecosystem stability and vitality, which is an important basis for testing models after risk identification. Therefore, according to the results obtained in this article, the key to study forest ecology is to plant the most suitable forest species and tree species on various site types and implement corresponding afforestation measures so that the entire region can achieve “suitable trees” and “rational management”, so that the potential of land production can be brought into full play and the goal of “use the land as much as possible” is achieved.
Impact Features of Water Source Mining on Spring Groups in Jinan City
Authors: Wu Dongqiang , Xing Liting , Zhao Zhenhua , Yao Chunmei , Li Jiangbai , Yu Miao , Meng Qinghan
Published: July 2020

In order to protect Jinan spring. This article is based on the research and analysis of the observation water level, extraction volume, spring water level, and observation data of water sources in West Jinan, western suburbs, and urban areas. It is concluded that: (1) According to the analysis of the dynamic type of groundwater level, there is a close hydraulic connection between the groundwater of West Jinan and Baotu spring spring group, which is a unified body of water with strong connectivity. (2) From the analysis of multi-year water level, spring discharge and mining volume, the impact of karst water mining in the western suburbs on the water level and spring discharge of urban spring water is very obvious.(3) The increase in the amount of karst water in the urban area and the decrease in the flow of spring water are very similar. Therefore, Jinan spring water is obviously affected by artificial mining. Controlling the amount of groundwater extraction, especially in urban areas, is of great significance to ensure the spring water gushing all year round. At the same time, it is necessary to make a good mining layout for the water sources in the western suburbs, West Jinan and eastern suburbs.
Study on the Xinjiang Herder County Planning from the Perspective of Production-living-ecological Space
Authors: Wei Wei , Yang Qing
Published: July 2020

Herdsmen settlements project is one of the most important measures to improve production, living standards and economic revitalization of pastoral herders. Due to technical and economic constraints, the herdsman settlements currently have and imperfect construction. This article taking Wenquan County as an example explores the arrangement strategy for herdsman-friendly rural planning, defined the living, production, and ecological spaces from the perspective of herders. During the implementation of the settlement project, there has been a development dilemma in which the production space invades the ecological space and separate from the living space. Through the evaluation of suitability, the suitable settlements construction areas are defined from the perspective of production-living-ecological space. The agricultural and pastoral space should be properly separated to relieve the pressure on land-use and promote the high-quality development of agricultural and animal husbandry.
Research on Ecosystem services of biodiversity conservation: A case study of Southwest China, Mekong Region
Authors: Zhang Zhuoya , Yue Zhihui , Chen Wuqiang , Lang Xiaoxue , Yang Xin
Published: July 2020

Tropical areas represent spaces of great environmental value. Their good ecosystem services can allow the protection of biodiversity. In southwest China, Mekong Region where ecological and socioeconomic context represent tropical regions of Southeast Asia that contain abundant biodiversity and are threatened with environmental degradation and deforestation. Transboundary eco-security has become an important and sensitive issue. The objective of this study is to evaluate the willingness of visitors to pay (WTP) to improve biodiversity and ecosystems across borders. After thinking about the importance of tropical regions, a survey analysis the local young people’s willingness to protect the environment and their views on WTP.
The Visualization Study on Research Progress of Thermal Comfort for Indoor Environment Based on CiteSpace
Authors: Liang Dongyang , Yang Lei , Cheng Xiang , Song Gaoju
Published: July 2020

The papers published from 2000 to 2019 in CNKI database were collected. CiteSpace software was used as visualization tool to analyze the research progress of indoor thermal comfort in China based on those papers. The results showed that the period, from 2000 to 2004, was the initial developing stage of researches on thermal comfort in China. From 2005 to 2019, there were two research fields developed of thermal comfort. One was to study the adaptive thermal comfort in different climates in China and try to promote the prediction model according to different climate characteristics. Another research keyword was to expand the field of thermal comfort research, e.g. studying the thermal comfort of the elderly and children, and studying rural houses and tall space buildings. Literature analysis also disclosed that “thermal sensation” and “thermal environment” were the core keywords in the field of thermal comfort from 2000 to 2019. According to research methods, “numerical simulation”, “field research” and “questionnaire” were commonly used. Recently, Thermal comfort under natural ventilation became the hot keyword in thermal comfort research. From 2011 to 2019, thermal comfort of rural housing had become a hot topic.
Research on the Recycling of Hazardous Medical Waste
Authors: Sun Chenglei
Published: July 2020

Hazardous medical waste is medical waste that will cut people, such as syringes, scalpel, scalpel, its material is good, but after the use, due to the single way of recycling, the vast majority of the hazardous medical waste is treated by centralized sterilization, crushing and incineration. It is not recycled and has a negative impact on the environment. On the other hand, criminals was selling medical waste and make use of the production of a variety of products, to obtain illegal interests, endanger the health of others. Therefore, exploring the recycling of damaged medical waste can not only realize the reuse of resources, but also crack down on illegal elements to protect people’s life and health. This paper analyzes the feasibility of the recycling of the hazardous medical waste by using the model and gives some suggestions.
Application research of waste red brick in water treatment
Authors: Wang Yibo , Wu Tongtong , Huang Jieyun , Liu Yingxin , Huang Jinming
Published: July 2020

With the development of economy and the promotion of the three old reconstruction, the quantity of waste red brick is increasing. Improper disposal and application of waste red brick constitute a potential hazard of environmental pollution. The waste red brick has large specific surface area and porosity, which can absorb and filter sewage. In the experiment, the specific gravity and adsorption capacity of red brick sand and the adsorption effect of red brick sand on rhodamine B and methyl blue were investigated. The results show that the particle size of 10 mm is suitable for the red brick sand. The adsorption time was 4 h, the adsorption capacity of red brick sand reached 0.388 mL/g. The particle size of red brick sand was 30 mm, the dosage was 30.019 g/100 mL of water sample, and the decolorization rate of water sample reached 80.09%. It can be seen that red brick sand has good adsorption performance.
Preliminarily pollution assessment and source analysis of heavy metals in agricultural soil from Xinjie Village, China
Authors: Wang Y L , Yan J J , Li F , Chen Min , Lü Guonian , Cui Xufeng
Published: July 2020

To explore the overall pollution level of heavy metals in agricultural soil and identify its main pollution sources, the selected eight heavy metals (As, Hg, Cr, Cu, Ni, Pb, Fe, and Cd) in 6 sampling sites of Xinjie Village from Qingjiang River Basin were detected. Nemerow index, Geo-accumulation index and Potential ecological risk index were used to evaluate the soil environmental quality. Results showed that the concentrations of Cd in all 6 sampling sites were relatively higher than the risk screening values for soil contamination of agricultural land. The overall heavy metal pollution level based on Nemerow index was slight. Specifically, the pollution level of Cd was moderate, while other metals were basically at clean level. Results of Geo-accumulation index showed Hg (moderately contaminated to heavily) and Cd (uncontaminated to moderately contaminated) were potential primary pollutants. The comprehensive potential ecological risk based on Potential ecological risk index was moderate, with the potential ecological risk of Cd (considerable) and Hg (moderate) higher than that of other metals. Therefore, the agricultural soil pollution in Xinjie Village was a combined pollution and mainly composed of Cd and Hg. Source analysis showed anthropogenic activities such as industrial and agricultural production were the main contributors to the accumulation of heavy metals in agricultural soil. Cd pollution mainly came from agricultural production (fertilization) and industrial emissions; the pollution source of Hg were mostly industrial emissions and the resulting atmospheric subsidence. Finally, the targeted countermeasures were developed for heavy metal pollution of agricultural soil based on the different pollution source characteristics.
Environmental Protection and Sustainable Development in Ecological Functional Zones
Authors: Wang Tuan’an
Published: July 2020

In order to explore the impact of ecological environmental protection measures on ecological functional zones and promote the sustainable development of ecology, the ecological functional zone of a hilly region in south China is taken as the research object in this study. Combined with the data of ecological environment and land use type in the past ten years, the ecological function index (water conservation index), ecological structure status (forest coverage, grassland coverage, and ratio of wetland in waters), and ecological stress situation (ratio of cultivated land to construction land) are analyzed to reflect the ecological status of ecological functional zones. The results show that in the past ten years, the water conservation index and forest coverage rate in the studied area have been improved significantly, and the ecological condition has become better, which indicates that ecological protection measures such as returning farmland to forest and closing mountains for forest cultivation can improve the ecological environment of ecological functional zones and contribute to the sustainable development of ecology.
Research on the Method of Safe Operation and Maintenance for UHV Equipment
Authors: Pei Ying , Niu Lin , Liu Xinghua , Wang Shitao , Zhang Yan , Wang Lei , Zhang Yanyan , Li Haifeng
Published: July 2020

With the continuous operation of UHV projects, the problem of safe operation and maintenance of UHV power grids has become an urgent problem to be solved. UHV main equipment has the characteristics of large volume, complicated structure, high technical content, and difficult operation and maintenance, and the scope of equipment failure is relatively large. This paper has made an in-depth analysis of the UHV substations and converter stations that have been put into operation, systematically studied the safety problems that need to be solved urgently, and finally, given a new method for the safe operation and maintenance of UHV equipment. The method has been applied to the maintenance of UHV substation equipment, and the results have proved the effectiveness, practicability and completeness of the new method.
Feasibility Analysis of New Energy Development under the Asian-African-European Grid Interconnection Mode
Authors: Li Nana , Xie Guohui , Zhou Liansheng , Gan Zhiyong
Published: July 2020

The power area of Asia-Africa-European power transmission is rich in new energy resources such as wind resources and solar resources. West Asia and Africa have the potential to build large-scale renewable energy power generation bases. Based on the basic idea of Levelized Energy Cost Analysis (LCOE), this paper proposes an improved feasibility analysis model of new energy power generation technology, comprehensively considering the impact of policies, technology, politics and other factors on the cost of power generation. Feasibility of power transmission from large renewable energy bases in West Asia and Africa to Europe are measured under interregional grid interconnection. The results show that: the wind and solar power generation bases in West Asia and Africa are feasible of transferring electricity to Europe, and solar intercontinental interconnected transmission is more feasible than wind power.
Study on Cooling Water Source Seawater Filtration System of Nuclear Power Plant
Authors: Wu Qiaojun , He Guangchu , Wen Hongyong , Lin Xinpeng , He Shengliang , Chang Xincai
Published: July 2020

Littoral nuclear power plants at home and abroad use seawater as cooling source, which is the cooling system of nuclear island and conventional island. In recent years, many marine organisms such as jellyfish, phaeocystis globosa, hyacinth melon and prawn have affected the safety of water intake of nuclear power plant, and even led to the event of unit load reduction operation, machine trip and even reactor trip. In this paper, by analysing the existing problems of cold source seawater filtration system in nuclear power plant, the plane layout of water intake project is optimized, and the sea biological interception filtration system is established. Relying on the large offshore platform, online monitoring of the incoming sea creatures and the status of interceptors can realize the mechanized automation of intercepting and cleaning, and improve the reliability and efficiency of intercepting and cleaning. Reduce manual intervention and temporary network layout, reduce the risk of marine personnel operation, and improve the ability to withstand severe weather and large-scale outbreak of marine organisms. It ensures the safe operation of nuclear power plant.
Study on Engraving Resistance Characteristic of Band Based on Different Structure Parameters of Rifling
Authors: Liu Qi , Wang Yuwei , Li Ruijing , Zhu Wenfang , Zhao Na
Published: July 2020

The gun barrel working in complex environments is prone to damage, including the wear and ablation of the bore in the gun barrel. These changes cause changes in the rifling structure, which in turn affects the combustion law of gunpowder gas, which affects the pressure in the bore and changes the internal ballistics of the gun performance. This article takes a large caliber howitzer as the research object, considers the frictional force change during high-speed and high-pressure sliding, and also considers the energy conservation criterion during the engraving process. The initial ballistic equations are established during the initial movement period and Coupled solution with band engraving process. Considering the large deformation, high strain rate, temperature softening effect and cumulative damage effect, an explicit dynamic algorithm is used to compare the differences of the elastic band engraving process under different rifling structure parameters. The influence of different rifling structure parameters on the force state of the belt is analyzed. The influence of the main structural parameters of the engraving system on the belt engraving process is obtained. It provides a useful reference for the integrated analysis of the ammunition and the gun and the optimization of the barrel structure.
Online sealing of SF6 leak for Gas insulated switchgear
Authors: Du Baoshuai , Zhang Zhongwen , Qiao Yaxia , Suo Shuai , Luo Hongjian , Li Xinmei
Published: July 2020

SF6 gas leak is a common issue that needs to be addressed for Gas insulated switchgear (GIS). In this paper, typical gas leaking defects of GIS are described with the reason leading to them. A cost-effective online sealing technology based on adhesion and gas diversion is established and a case study is presented. Besides, an analytical model which can be used to predict the pressure evolution for the leaking component as well as in the sealing zone is proposed. It has been shown that this technique can be applied to sealing SF6 gas leak of GIS components with different shape and structure.
Model of Clean Energy Substitution Based on Energy Saving and Emission Reduction Targets
Authors: Zhao Ailin , Lan Mengxin , Zhang Xiaochun , Zeng Ming , Sun Chenjun
Published: July 2020

Under the situation of increasing air pollution and rapid development of clean energy, actively promoting energy substitution plays an important role in implementing energy strategy deployment and safeguarding energy security in China. This paper puts forward an energy substitution path considering the interaction between different energy sources, and establishes an energy alternative model based on energy saving and emission reduction targets. The proposed model takes the total amount of carbon emissions as the optimization target, and calculates and analyses the energy substitution path and the substitution space by considering the terminal energy consumption characteristics and the restriction of clean energy supply. Finally the paper makes instance calculations on the energy substitution space at the end of 13 th five-year plan and the 14 th five-year plan. The calculation result verifies the feasibility and superiority of the proposed model and solution method.
Analysis of electromagnetic force of damping winding in salient pole synchronous motor short circuit fault
Authors: Shen Yubo , Lan Sen , Zhang Dewen , Xu Minhu , Zhang Kexin , Liu Heqian , Kong Fanrong , Yu Hao
Published: July 2020

In recent ten years, China’s pumped storage power station has developed rapidly. As the core component of pumped storage unit, salient pole synchronous motor is very important to study its abnormal operation. In this paper, taking salient pole synchronous motor as the research object, the mathematical expressions of magnetomotive force for single-phase short circuit to ground, phase to phase short circuit and two-phase short circuit to ground are derived respectively, and the mathematical law of magnetomotive force for short circuit fault of salient pole synchronous motor under generating condition is revealed. It provides a basis for fault diagnosis, related research and calculation of salient pole synchronous motor.
Research on energy repetitive conversion of multi-micro grid system based on CVaR
Authors: Ma Jing , Meng Jinchuan , Feng Qiming , Feng Junlong , Liu Zhipeng , Liu Mingwei , Li Jinyu , Li Jiamei , Chen Xiaoke
Published: July 2020

the introduction of power to gas P2G (power to gas) equipment inside the micro grid strengthens the coupling between the power and natural gas network, reducing the phenomenon of wind and light abandoning, but also makes the renewable energy during the optimal scheduling of energy conversion, reducing energy efficiency, resulting in energy consumption. At the same time, with the aggregation of more and more microgrids in a certain region, a multi-microgrid system is formed, which has power interaction between microgrids. In this context, CVaR is introduced into the objective function of economic dispatching, and an optimal scheduling model considering the internal energy repeated conversion and power interaction between microgrids is established. This model takes into account the influence on the output of each equipment, and the optimal operation plan and optimal operating cost of the system are obtained. Finally, an example is given to verify the model, and the results show that the proposed optimal scheduling model can reduce the operating cost of the system, improve the energy efficiency and realize the energy optimization management of the whole system under the condition of improving the consumption of renewable energy.