bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on similar test device of deep roadway impact
Authors: Yao Zhuangzhuang 
Published: May 2021

Abstract
With the continuous increase of coal mining depth, the impact of ground pressure disaster is showing more and more serious development trend, which poses a great threat to the safety production of coal mine and the life safety of miners. The design and construction of similar test bench for deep tunnel excavation has become one of the difficult problems of scholars at home and abroad When the impact of high altitude falling hammer on the tunnel is tested, the drop hammer hits the pressure column and will be bounced, causing two shocks and affecting the experimental results. Based on the disaster mechanism of roadway rock burst, and simulating the damage caused by the immediate release of rock burst, we designed a test system that can fall smoothly when the falling hammer falls, and it will be held when the falling hammer starts to fall again. The device prevents the second impact of the falling hammer in the impact test of the roadway, and realizes the dynamic loading of the roadway.
Research on increasing oil production through fracturing
Authors: Wei Zuo , Jian Gou , Bo Liu , Wenfeng Huang , Haitao Li , Feng Li , Ling Dong 
Published: May 2021

Abstract
The main measures to increase the production of oil field are to expand the formation channels or open up new channels. The increase of production of oil field plays a very important role in the process of oil field exploitation in our country. It is one of the fracturing methods that people often use, which can effectively improve the exploitation efficiency of oil field and guarantee the exploitation quality of oil field With the development and progress of oil well fracturing technology, we should continue to innovate and improve, promote the continuous increase of oil well production in China, and promote the stable development of oil fields in China.
Analysis and Countermeasures of the Causes of Low-Yield Wells in Hailaer Oilfield
Authors: Liu Xin 
Published: May 2021

Abstract
Due to complex geological conditions, fault development and great reservoir changes, some inefficient wells appear in Hailaer oilfield after it is put into development. In addition, with the deepening of oilfield development, water cut in some well areas rises abruptly. Through continuous practice and exploration, geological understanding and continuous deepening of development law, no matter from improving oilfield development effect or improving oilfield development economic benefit it is necessary to study systematically. Therefore, through the systematic analysis of the causes of low production wells in Hailaer oilfield, this paper summarizes the treatment methods and effects in the past years, and forms a set of mature treatment methods.
Structural Life Analysis of Roller-compacted Concrete Asphalt Pavement
Authors: Liu Feng , Wu Chuanhai , Li Jun , Xu Xinquan 
Published: May 2021

Abstract
Based on the long-life test road of Yunluo expressway in Guangdong province, firstly, based on the theory of small disturbance elastic thin plate and the design code of the highway cement concrete pavement, the life analysis of the roller-compacted concrete pavement structure of the Yunluo long-life test road is carried out. The results show that the pavement structure can achieve a 53.2 years long-life. Secondly, in order to verify the reliability of the theoretical analysis results, the strain sensors and the temperature sensors were embedded in different layers of the test road. After years of continuous data collection and based on the constitutive model of the roller-compacted concrete material, the theoretical analysis of the results concluded that the pavement structure can achieve at least 45 years life. The results of theoretical and practical analysis show that the new type asphalt pavement structure on the roller-compacted concrete base can be used as a typical long-life asphalt pavement structure under high temperature, rainy and heavy load conditions in Guangdong province.
Research on large-scale clean water mesh fracturing technology
Authors: Liu Yuhang 
Published: May 2021

Abstract
hailaer oilfield belongs to low permeability fault-block oilfield, some blocks effectively injection Wells after fracturing is still hard, lead to low formation pressure, the late refracturing effect is poor, single and average increased under 400 t oil and to explore effective fracturing technology in the low permeability elastic exploration area, hailaer oilfield since 2011, in fissured budate reservoir, according to the characteristics of the reservoir Large-scale clear water fracture network fracturing tests have been carried out, and better stimulation effect has been achieved. The tests have guiding significance for the effective development of low efficiency and difficult to recover reservoirs in Hailaer oilfield.
Research on the Formation Mechanism of Seepage Channels in Broken Rock Mass under the effects of Particle Migration
Authors: Ma Xiaotong , Tang Lizhong 
Published: May 2021

Abstract
Seepage within broken rock mass widely exists in geotechnical engineerings, such as railways, slopes, dam foundations and mining. Seepage is often accompanied by particle migration, which usually cause structural instability and water inrush disasters. In order to study the formation mechanism of seepage channels in the brocken rock mass under the effects of particle migration, a series of seepage tests were designed on broken red sandstone. The effects of pore pressure and particle size distribution (PSD) on particle migration and porosity evolution were studied. The main conclusions are as follows: 1) By observing the particles collected during the seepage process, particles with size range of 0-2 mm, 2-5 mm and 5-8 mm appear in sequence, which means that with the formation of seepage channels, large size of rock particles can pass through the broken rock mass. 2) The cumulative mass of migrating particle increases with the increase of pore pressure and decrease of PSD; with the increasing duration of migration process, the pore pressure and PSD decrease. 3) The peak value of porosity increases with the increase of pore pressure and decrease of PSD. According to above results, the seepage channels of the samples with smaller PSD and larger pore pressure are wider. Besides, the formation speed of seepage channels is larger in sample under higher pore perssure. These can explain the higher risk of geological disasters (i.e., water inrush and structural instability) in broken rock mass within higher pore pressure and smaller PSD.
Simulation Study on the Effect of In-cylinder Water Injection Mass on Diesel Engine Combustion and Emissions
Authors: Wang Shaoheng , Yao Baofeng , Yu Yusong , Niu Kai , Yuan Meng 
Published: May 2021

Abstract
Based on Caterpillar 3401 diesel engine, a complete three-dimensional model of the combustion chamber was established in CONVERGE to study the effect of in-cylinder water injection on combustion characteristics and emissions within the water injection mass rang from 5mg to 100mg. With the water mass increase, the pressure, power and temperature in the cylinder increase first and decrease later. The changes of CA5 and CA10 of the heat release are not obvious. CA50 of the heat release advances first and delays later. The combustion duration shortens first and increases later. NOx emission is increases as the water injction mass increases from 5mg to 40mg, but it is decease when the water injction mass increases from 40mg to 100mg. And when the mass of water is 100mg, it has the best suppression effect on NOx. Otherwise, the water injection has the best suppression effect on Soot when the water mass is 60mg.
Analysis and research of several indoor air purification methods
Authors: Wan Zhiqiang , Zhang Qingqing , Xu Liang 
Published: May 2021

Abstract
Air pollutants refer to foreign substances that enter the near ground or the near ground environment in the form of gas. Generally, they are substances that are discharged into the atmospheric environment during human activities or natural processes and have harmful effects on human beings or the environment. Usually there are solid pollutants and gaseous pollutants two categories, solid pollutants in the common dust, suspended particles, etc. (usually called particulate matter); Among the common gaseous pollutants are volatile organic compounds, nitrogen oxides, benzene, sulfur oxides, ammonia, hydrocarbons, formaldehyde and so on caused by pollution caused by decoration materials. Aiming at different air pollutants, this paper introduces the differences and characteristics of several air purification methods, and points out the research significance of air purification technology.
Environmental protection of resource-based cities around the Bohai Sea from an ecological perspective
Authors: Li Bo , Zhang Jing , Liu Jing , Qin Huan 
Published: May 2021

Abstract
The huge demand promotes the continuous increase of the demand for resources by industrial enterprises, and the exploitation of resources will also cause ecological and environmental problems. This paper takes resource-based cities in the Bohai Rim region as the research object, analyzes the development status of the Bohai Rim resource-based cities from the perspective of ecological protection and explores the problems in them, which is beneficial to provide a reference for the green development of resource-based urban industrial enterprises, thereby reducing ecological Pollution. Analyze the status quo of industrial development by measuring the deviation and advancement of the industrial structure. The results show that the level of industrial advancement in resource-based cities around the Bohai Sea has a downward trend; the degree of industrial structure deviation has an upward trend. On the whole, the protective strategies for accelerating the green development of industries in resource-based cities around the Bohai Sea and promoting ecological governance are derived: industrial adjustments must be carried out in a scientific and orderly manner, and the proportion of development among the three industries must be balanced; technological innovation is used to promote the green development of industrial structure.
Study of low-carbon energy development in China: the case of Fujian Province
Authors: Gao Hongye 
Published: May 2021

Abstract
Carbon emissions caused by energy consumption have a serious impact on global climate change, causing serious environmental problems. As one of the world’s largest energy consumers and carbon emitters, China needs to attach great importance to low-carbon energy development, and address major environmental issues such as ecological destruction and climate warming. In the process of energy low-carbon development, Fujian Province is faced with a series of challenges in terms of energy structure, social and economic development, capital and technology, etc. However, at the same time, Fujian Province in China also has opportunities to develop energy low-carbon in terms of emission reduction space and rich forest resources. This paper firstly describes the energy consumption situation in Fujian Province and emphasizes the necessity of using low-carbon energy, then analyzes the energy structure of Fujian Province and the relationship between low carbon development and the adjustment of industrial structure in Fujian Province. Finally, this paper proposes that Fujian Province should make use of the advantages of renewable resources to develop a reasonable low-carbon energy development strategy.
Indoor air pollution and prevention
Authors: Wang Yingchun , Jia Xuelin 
Published: May 2021

Abstract
With the continuous improvement of the social level, the physical health condition is gradually paid attention to. However, most people spend most of their life indoors. Indoor environmental pollution has become a major problem affecting people’s health and safety in modern society. This paper analyzes the status quo of indoor pollution, indoor pollutant sources, indoor pollution hazards, and describes the prevention and control measures of indoor pollution to reduce the harm of indoor air pollution to human body.
The impact of urban green and intelligent logistics on urban environmental protection
Authors: Cao Yuliang , Zhang Xisheng 
Published: May 2021

Abstract
With the acceleration of urbanization in China, the problem of urban pollution has become more and more serious, which has brought great negative impact on people’s life. The construction of urban intelligent logistics system, planning and guiding the green development of the city, at the same time, it also plays a certain role in promoting the environmental protection of the city. In this paper, based on factors other than green and green city green wisdom logistics countermeasure analysis, put forward the comprehensive evaluation index system of green wisdom logistics, combined with urban environmental protection, put forward the application of fuzzy analysis method to evaluate urban environmental protection green wisdom logistics, and put forward the comprehensive evaluation index system of urban green wisdom logistics contributes to promoting the development of green and urban environmental protection.
The New Sealing Structure Design and Research of Pressure Hull of CRDM With the Special Environmental Conditions
Authors: Xu Huaijin , Luo Qingsong , Tang Baoqiang , Ma Zhigang , Han Jiaxing 
Published: May 2021

Abstract
The pressure shell seal structure is an important part of the control rod drive mechanism, and it is also one of the key structures to ensure the normal operation, safety and reliability of the reactor. In this paper, a new type of sealing structure of pressure shell of control rod drive mechanism is proposed to meet the requirements of multiple loading and unloading in special marine environment. Compared with the traditional welding connection structure, it has the advantages of fast and convenient operation, easy replacement of sealing components and so on. It can greatly shorten the loading and unloading time of control rod drive mechanism in the refueling process and avoid damage.
Numerical Simulation Study on Hydraulic Transients in Hydropower Station with Trigeminy Surge Tank
Authors: Li Gaohui , Yang Fei , Zhou Tianchi , Cui Weijie , Yang Shaojia 
Published: May 2021

Abstract
A static and dynamic model for hydraulic transient calculation of three-throttled-orifice surge tank was established based on the basic equations of surge tank, by using structure matrix method (matrix analysis of structure?). Control conditions in an engineering practice were calculated by a simplified model and a three-throttled-orifice model respectively. The results indicate that the maximum pressure at the volute end, the maximum rising rate of unit speed and the water level extremum of the surge tank are basically identical by using these two models, but the minimum pressure at draft tube inlet is significantly different. The three-throttled-orifice model was found capable of calculate the flow between throttled orifices at constant state and the pressure behavior at draft tube inlet during the transition accurately. The selection of the resistance factor is discussed in the end, and it is proved that the resistance factor is allowed to have a certain tolerance in the transition calculation, which will not obviously affect the maximum pressure at draft tube inlet and water level extremum of the surge tank. This research can provide reliable reference for the transient calculation of three-throttled-orifice surge tank in similar engineering practice.
Research on Demand Response Aggregators Participating in Power Market Based on Bi-level Optimization
Authors: Shen Weijie , Fang Cheng , Ma Jiaxin , Lin Jialin , Zeng Ming 
Published: May 2021

Abstract
With the rapid development of smart grid technology, how demand side resources participate in power market has become a research hotspot. This paper proposes a bi-level optimization model for demand side resource aggregators to participate in electricity market transactions. In the bi-level model, the lower level is the wholesale market clearing model aiming at the maximum social benefit, and the upper level is the bidding decision model aiming at the maximum power consumption benefit of air conditioning load. The case study demonstrates the feasibility and effectiveness of the model.
Optimization Research on Surge Chamber of an Energy Dissipation Power Station
Authors: Zhang Shengtai , Wang Delou , Wangjia Danzhen 
Published: May 2021

Abstract
With the development of our country’s economy, water conservancy projects such as reservoirs have taken the leading role in the national economic support, The status of water conservancy projects is getting higher and higher, and the country is paying more and more attention to the optimization of water supply, irrigation, and flood control reservoirs. In this paper, the optimization of the large well section of the surge tank is studied in connection with the establishment of the reservoir and the development of hydropower resources. First, the basic equation of the complex surge tank and the calculation equation of the stable section of the surge tank are established, and the calculation model is established through the HYSIM software. for the optimization of the section area of the surge tank, under different working Cases, different large well diameters were selected, and the maximum and minimum surge fluctuation amplitude, relative speed deviation, adjustment time, attenuation and convergence speed of the surge tank were carried out. Analysis and optimization. In large fluctuating Cases and different large well diameters, the highest and lowest surge of the surge chamber can meet the requirements of structural elevation control, Under small fluctuation Cases and different large well diameters, the water delivery power generation system can meet the stability requirements, The surge decay speed of surge chambers with a diameter of 8m is significantly greater than that of surge chambers of other diameters.
BIM-RFID Technology for Facility Management in Power Systems
Authors: Sun Chenglei , Wang Siwen , Li Longmei 
Published: May 2021

Abstract
Currently, there is a lack of a practical and straightforward method to accomplish concealed facility positioning and maintenance work in power systems, such as a substation or power plant. On the one hand, it is hard to find the accurate location of a specific device that is on the ceiling or underground in the Operation and Maintenance (O&M) phase. Another challenge is to provide useful information for facility maintenance workers and to bring a visible location image for them on the site. In this paper, Building Information Modeling (BIM) and Radio Frequency Identification (RFID) technologies are used to solve facility positioning and maintenance issues in power systems. First, the facility position can be determined by comparing the real RFID tag location with the virtual RFID tag location. Moreover, the target-related facility information for the maintenance work can be acquired by BIM models. Lastly, the live view of the specific location of a concealed equipment can be shown on a mobile terminal on the site by using a simple Augmented Reality (AR) technique. This paper, containing a substation case study, demonstrated that the BIM-RFID technology could achieve precise positioning, efficiency improvements, and re-visit times and costs reduction in power systems.
Anomaly Recognition and Correction Algorithm for Big Data of Distribution Network Load
Authors: Huang Tao , Wang Ziqiang , Wang Wei , Zhang Qiang , Chen Yanwei 
Published: May 2021

Abstract
With the continuous improvement of the intelligent degree of distribution network, load information presents the growth of big data level, large-scale, mixed, inaccurate monitoring or collection of load data often appear, which brings some difficulties to the scheduling and forecasting work. Therefore, it is necessary to identify and correct these abnormal data. Based on the analysis of the causes and distribution characteristics of different types of abnormal load data, this paper identifies and modifies the abnormal data based on the improved density estimation algorithm, so as to realize the rapid processing and repair of the distribution network load big data. Finally, the power load data of a province in 2020 is selected to clean the load data. The results show that the algorithm proposed in this paper can quickly and accurately realize the identification and correction of abnormal load data.
Stable and efficient perovskite solar cell using hydrophobic tris(pentafluorophenyl)phosphine as a hole dopant
Authors: Han Fei , Wang Lingling 
Published: May 2021

Abstract
2,2’,7,7’-Tetrakis [N, N-di(4-methoxyphenyl) amino]-9,9’-spirobifluorene (spiro-OMeTAD) is the most versatile hole transporting material in n-i-p type perovskite solar cell (PSC). Among them, 4-tert-butylpyridine (tBP) and bistrifluoromethanesulfonimide lithium salt (Li-TFSI) hole dopants are use to increase the conductivity of spiro-OMeTAD and further improve the device’s performance. The devices are not stable for long periods of time due to the hygroscopicity of Li-TFSI. Based on these, a phosphorus-containing hole dopant tri(pentaflorophenyl)phosphine ((C6F5)3P) was developed in this study, which further improve the power conversion efficiency (PCE) of the PSC and device stability. Further, the above results indicate that the performance (18.876%) of PSC based on 7 wt% (C6F5)3P-doped spiro-OMeTAD hole-transporting layer (HTL) was superior to that of the device based on undoped spiro-OMeTAD (10.957%), and the performance of PSC based on spiro-OMeTAD doped with tBP and Li-TFSI (17.056%). In addition, the stability of the device was greatly improved. After 1008 h of aging test (Room temperature, atmospheric atmosphere, relative humidity 50-80%), the PCEs of the above devices retained the initial value of 85% (the device based on 7 wt% (C6F5)3P-doped spiro-OMeTAD) and 24% (the device based on tBP/Li-TFSI-doped spiro-OMeTAD), respectively.
Analysis on Operation and Maintenance Management Mode of 35kV and 110kV Transmission Lines
Authors: Cong Wenkui 
Published: May 2021

Abstract
At present, in the process of social development, the demand for electric power and energy continues to increase. In order to ensure the stability of public power grid operation, electric power enterprises need to actively carry out the operation and maintenance management of 35kV and 110kV lines. This paper analyzes the operation and maintenance management problems of 35kV and 110kV transmission lines, introduces the optimization points of operation and maintenance management mode of transmission lines, and puts forward some guarantee strategies.
Effect of Cylinder Air Charge bypass on Combustion Characteristics of Gasoline Engine at Low Load
Authors: Liao Yong , Chen Yongyan , Zhang Bin , Li Lin , Zhang Li 
Published: May 2021

Abstract
Enhancing TKE (Turbulent kinetic energy) in cylinder is beneficial to accelerate flame propagation, short combustion duration and improve the thermal efficiency. In order to improve the TKE of the engine under low load, the design of air charge bypass was introduced. Based on Converge, the flow in cylinder of different design schemes was analyzed, and the best scheme was selected for combustion analysis experiment. The results show that there is little effect of bypass inclination angle on the flow, and only swirl is changed by the position of bypass channel, however the increase of the diameter of the bypass channel can significantly improve the tumble, swirl and TKE in the cylinder. Compared to the engine without bypass channel, the thermal efficiency of the engine with bypass channel is increased by 16% under low load (BMEP=2bar and engine speed= 3000rpm).