bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Distribution Law of Spontaneous Combustion “Three Zones” in Goaf of Fully Mechanized Mining Face with Large Mining Height
Authors: Li Chengyu , Zhang Lili 
Published: December 2019

Abstract
In order to explore the large mining height are broken coal seam fully mechanized working face goaf spontaneous combustion “three zones” under the different height of distribution, through the establishment of numerical model, builds the working face goaf spontaneous combustion “three zones” three-dimensional sampling analysis system, through the analysis of oxygen, carbon monoxide, carbon dioxide and other coal spontaneous combustion index gases change law of goaf spontaneous combustion dangerous area under different heights for the division, the goaf three-dimensional spontaneous combustion dangerous area is determined. The results show that the “spontaneous combustion zone” of goaf in fully mechanized coal face of large mining height gradually widens along the vertical height, and the spontaneous combustion risk area becomes larger.
The study on desiliconization mechanism of sodium aluminate solution prepared from aluminum ash
Authors: Wang Yiru , Zhao Qiupin , Li Xiaolong , Zhi Pengkuo , Zhao Dan 
Published: December 2019

Abstract
The sodium aluminate crude solution prepared by using aluminum ash often contains a certain amount of sodium silicate impurities, and needs refined desiliconization. In this paper, desilication treatment of sodium aluminate solution by adding calcium oxide during sintering and refining. Experimental results show that the amount of calcium oxide added, desiliconization time and desiliconization temperature have an important influence on desiliconization efficiency of sodium aluminate solution. The results show that the desiliconization efficiency can reach 95.80 % under the optimal conditions, which satisfies the crystal decomposition of sodium aluminate solution.
Low-nitrogen combustion reformation for boiler burner
Authors: Yang Yan , Zhang Junjie , Liu Xiaobin , Hongxia Li , Wang Hongtao 
Published: December 2019

Abstract
In view of the current reformation for denitrification and cost reduction in coal-fired power plants, the boiler burner was upgraded in our company. On the basis of the comprehensive study of the low nitrogen burners of the major coal-fired power plants, the following low nitrogen retrofit measures were implemented: low NOx retrofit measures of the burners, anti-slagging and anti-corrosion measures, as well as high-efficiency measures for stable combustion. The results showed that the improved burner had better air counterweight ratio and could ensure the stable combustion of pulverized coal. Under the pure coal condition, NOx was reduced from 600mg/m3 to 210mg/m3. Under the mixed combustion condition, NOx in the flue gas decreased from 410mg/m3 to 160mg/m3. The boiler efficiency was slightly improved after the reformation, for the boiler efficiency increased from 91.49% to 91.79% under the condition of gas mixing and increased from 92.92% to 93.79% under pure coal condition. As shown above, the NOx emission for burner was reduced without affecting the working efficiency and the cost of denitration was also controlled after reformation.
Research on Risk Assessment of Coalbed Methane Development Project Based on SEWM-GCA
Authors: Wang Wanqing , Lyu Shuran , Zhang Yudong , Shuqi Ma 
Published: December 2019

Abstract
Coalbed Methane development is a complex system project with complex technology, many links and long cycle. It is highly susceptible to risks such as legal, technical and management during the development process. In order to scientifically measure the overall risk of CBM development projects, reduce resource waste and property losses caused by risk management failure. This paper constructs a risk assessment index system for CBM development projects consisting of six first-level indicators and 28 second-level indicators. The weight of each indicator is calculated by the structural entropy weight method. Secondly, based on the grey clustering analysis method, the theoretical model of risk assessment for coalbed methane development projects is established. Finally, an empirical study on a coalbed methane development project in Qinshui County, Shanxi Province was carried out using the evaluation system. After calculation, the overall risk level of the project is Grade II. The evaluation results are consistent with the actual situation of the enterprise, indicating that the established evaluation system has certain effectiveness and feasibility.
Research on Comprehensive Efficiency Evaluation of Mineral Resources Development
Authors: Yi Lu 
Published: December 2019

Abstract
Based on the analysis of ecological economy and circular economy of mineral resources development, this study establishes a comprehensive efficiency evaluation index system from three aspects: resource utilization efficiency, ecological compensation efficiency and development benefit efficiency, and uses the entropy method to determine the index weight. The comprehensive efficiency levels are evaluated by the TOPSIS analysis method. Through the empirical research, the sample enterprises have been comprehensively evaluated. The evaluation results show the reliability and practicability of the evaluation indicators and evaluation methods, and provide reference for the future high-quality development of the enterprise.
Vertical axis wind turbine with low turbulence Fluid-driven simulation
Authors: Zhou Ping , Yang CAO , Jiawei QI , Jinyi LI 
Published: December 2019

Abstract
New blade was designed by combining the advantage of sweepback and characteristic of flight trajectory. Mass and rotational inertia of turbine were calculated before using UDF and SDOF to build up the condition of fluid-driven simulation and observing the behavior of VAWT with airfoil NACA0012-800, LJY-800 and NACA23012-800. Results showed the potential of new designed airfoil and blade with better aerodynamic stability. Fluid-driven simulation gave out further suggestion that VAWT with high lift-drag ratio coefficient and power coefficient should be validated for its feasibility by fluid-driven simulation.
Research on Control Factors of Remaining Oil Distribution
Authors: Wei Xiaolong , Hu Wenjun , Li Tao , Yuan Yaofeng 
Published: December 2019

Abstract
Aiming at the characteristics of the overall dispersion and local enrichment of residual oil in the high water cut period of the continental water flooding reservoir, the Fuyang oil layer in the V block of Xinli Oilfield is taken as the research object, the remaining oil enrichment law is the main line, and the comprehensive application of earthquake, logging. Based on drilling, logging, closed coring, testing and production dynamic data, we conducted research on the effects of various geological factors and development factors on the remaining oil distribution. Preliminary research indicates that the remaining recoverable reserves with a certain scale are mainly controlled by the heterogeneity of reservoirs such as low-order faults, interlayers and physical properties, and the differences in hydrodynamic conditions.
Energy, environmental and economic assessment of a manufacturing plant with practical solutions
Authors: Wang Chunping , David Chicaiza Ortiz Cristhian 
Published: December 2019

Abstract
Considering the role that China has in the industry which triggers challenges in the environmental, economic and energetic sector. This study aimed to evaluate the energy consumption key points for a manufacturing factory located in Shanghai and propose practical projects to improve its performance. The methodology followed an inventory analysis and theoretical calculation in the three sectors mentioned, being the most representative the emissions of carbon dioxide, payback period and the standardization of the energy units. Among the results, the most energy-consuming areas and equipment were found; then, three projects were suggested to implement: the installation of a heat recovery system for the air compressor system, an insulation layer for the injection machine and installing a new air compressor, plus several common suggestions for manufacturing plants. Most of the projects presented a payback period lower than two years and relatively fast implementation for manufacturing plants.
Research on International Comparison and Future Development Trend of China’s Electrification Level
Authors: Zhang Chuncheng , Li Jiangtao , Weng Yuyan 
Published: December 2019

Abstract
Problems such as shortage of resources, environmental pollution, and climate change are increasingly becoming serious obstacles to the development of human society. To cope with these problems, a new round of energy transformation is in full swing, and electricity is playing an increasingly important role as a clean, efficient and convenient secondary energy source. In this paper, we compare China’s electrification level with the global and 10 typical countries, summarize the development characteristics of global electrification level, analyze the current situation of China’s electrification level. In the end, we comprehensively consider the factors affecting the electrification process, and combine relevant research to judge the development trend of China’s electrification process in the future.
Preparation of Calcium Chloride Composite Adsorbents for Woodchip by Carbonization Porosity
Authors: Hu Bing , Shao Youyuan 
Published: December 2019

Abstract
In order to improve the mass transfer performance of calcium chloride based composite adsorbents, calcium chloride was embedded in wood chips by soaking, and then the calcium chloride wood chips were carbonized to form holes. SEM images and elemental analysis show that at a charring temperature of 700 °C, the composite adsorbent prepared by charring calcium chloride sawdust has a developed pore structure, and calcium chloride is evenly dispersed in the adsorbent. The adsorption properties of the composite adsorbent to ammonia gas were shown to be 0.204, 0.253 and 0.285 kg/kg at evaporation temperature of - 5 °C and condensation temperature of 40 °C at adsorption time of 5, 10 and 15 min, respectively. SCP(refrigeration power per unit mass sorbent) is 868.96, 540.02 and 405.16 W/kg, respectively, with average adsorption rates of 6.79 * 10-4, 4.22 * 10-4 and 3.17 * 10-4 kg/kg/s, respectively, At the same time, the expansion and agglomeration of calcium chloride were solved.
Sound insulation and noise reduction technology for modular housing used in airport environments
Authors: Qiu Jialin , Zhang Jianfei , Zhang Qingyu , Chen Baoguang , Zhang Pingping , Xie Rongling , Li Minghui 
Published: December 2019

Abstract
The purpose of this study is to provide a modular building of steel structure to meet the requirements of internal construction and acoustics of the airport, improve the living environment and rest conditions of tower staff, relieve the daily work pressure of staff and improve work efficiency. The research of this subject has practical application value for the construction of staff dormitory of airport tower.
Experimental investigation of high strength reinforced concrete columns damaged by fire and retrofitted with CFRP jackets
Authors: Xu J , Tan C , Aboutaha R 
Published: December 2019

Abstract
This paper presents the compressive behaviour of high strength circular reinforced concrete (RC) columns exposed to fire following the ISO834 standard fire curve for 1 or 2 hours, air cooled, and then retrofitted with 2 layers of transverse carbon fibre reinforced polymer (CFRP) wraps. Total 5 circular RC columns ϕ300mm x 1000mm) were tested to investigate the effects of fire duration and the effectiveness of CFRP jackets. The investigated compressive behaviour of columns included load-displacement relationship, CFRP load-strain response and failure mode. Large temperature gradient was observed when columns were exposed to fire. For the unretrofitted columns, the test results showed that the ultimate capacity and stiffness of fire-damaged RC columns was decreased due to the deterioration of concrete at elevated temperatures. Longer fire duration leads to more sever damaged on columns. CFRP jackets could effectively restore the stiffness and improve the ultimate capacity of fire-damaged circular columns.
Research on Curriculum Reform of Mechanical Manufacturing Equipment Design Based on Engineering Awareness Training
Authors: BaoJiading  , Weiguang Zheng 
Published: December 2019

Abstract

Machinery Manufacturing Equipment Designis an important professional course in mechanical design, manufacturing and automation of colleges and universities. It involves a wide range of knowledge, and requires a high level of students’ comprehensive ability to apply knowledge. It is practical and applicable. However, the current teaching model still has a weak engineering awareness, and students lack engineering practice ability and independent innovation ability. The study of many contents of the course still stays in the teaching of theoretical knowledge, so that the students’ understanding of the course Mechanical Manufacturing Equipment Designis limited to the text of the book and cannot be combined with engineering practice. Therefore, the teaching content of the course Machinery Manufacturing Equipment Designneeds to be reformed, mainly to strengthen students’ engineering awareness, thus strengthening students’ practical ability and innovative ability, and promoting students’ all-round development.
Research on Teaching Reform of Experimental Measurement of Temperature Field and Thermal Deformation of Machine tool
Authors: He Shuilong , Tang Tao , Bao Jiading , Tang Rongjiang 
Published: December 2019

Abstract
With innovation and reform proposal of intelligent manufacturing 2025 in China, the precision of machine tool is required to be higher in the field of intelligent manufacturing, and the thermal deformation of machine tools is one of the main factors affecting machining accuracy. The measurement of temperature field and thermal deformation of machine tool has become one of the most important contents in undergraduate teaching experiments in many colleges and universities. In view of the shortcomings of the traditional teaching of the experiment, which only uses some instruments for finite point measurement, an experimental teaching scheme is supplemented by vibration for full-state testing, along with a new testing technology is proposed in this paper. All of them are expected to enrich testing means, expand the students’ horizons, improve students’ ability of testing, data processing and analysis, increase students’ interest in learning, and enhance students’ comprehensive design ability of machine tool fixture. The practice shows that the experimental teaching plays a positive role in cultivating students’ knowledge mastery ability and using theoretical knowledge to solve problems, thus greatly improve the teaching effect.
The effect on the shock wave resulting from the rocket explosion on launch pad
Authors: Wang Yan , Wang Hua , Cui Cunyan 
Published: December 2019

Abstract
Once an explosion occurs, it would threaten the safety of personnel and facilities around the launch site. In order to study the propagation law of shock wave near-ground and the multiplicative effect on peak overpressure of the ground, the finite model of near-surface explosion has been established based on explicit nonlinear dynamic ANSYS/LS-DYNA program. Results show that the existence of the ground will change the propagation law and conform to the reflection law of the shock wave. For gauges at different heights, ground may have different effects on the peak overpressure. When xis not greater than 20m, the peak overpressures of h greater than 2m are the same, but less than the peak overpressures of hequal to 2m. When x is greater than 20m, the peak overpressure decreases with the increase of h, and eventually the peak overpressure of different h gradually tends to be the same.
Research on the control technology of heavy layer hard roof blasting
Authors: Wang Jianwei 
Published: December 2019

Abstract
In this paper, based on the typical geological features of heavey layer hard roof, around a blasting weakening control of complete sets of technology, through the theoretical calculation and numerical simulatio, analyses the rules of the thick layer of hard roof and the characteristic of mine pressure appear; Based on the theoretical analysis, the attenuation height of vertical blasting and the circular blasting distance are determined. By weakening roof blasting scheme design, pull cut blasting with two lane ahead of deep hole blasting weakening technology, this paper introduces hole arrangement, drilling tool, design parameters control and instrument. A complete set of technical measures to reduce the control of hard roof blasting in thick layer is formed, and the rationality of the technical measures is confirmed by field observation. The relevant research results have important practical significance and reference value to the hard roof management of similar geological conditions.
Degradation of phenol in water by Fe(II)-citrate activated persulfate oxidation
Authors: Fang Maoying , Mao Mengqian , Wen Zhiguo 
Published: December 2019

Abstract
To enhance the degradation efficiency, complexing agent citric acid (CA) and trisodium citrate (TC) were introduced into the Fe(II)-persulfate (Fe2+/PS) oxidation system to degrade phenol. And the optimal operating conditions were determined. The results showed that Fe2+-citrate/PS system had higher degradation efficiency than the others. The optimal operating conditions to degrade phenol in water were: a PS concentration of 0.06 mol/L, a Fe2+ concentration of 0.02 mol/L and a TC concentration of 0.01 mol/L, while reaction temperature and the initial pH values had little influence on the phenol degradation.
Research on Project Approval Evaluation Index of Highway Engineering Metering Technical Specification Based on Delphi Method
Authors: Zhu Jing 
Published: December 2019

Abstract
As the standard and basis for metrology, testing and calibration, highway engineering metrological technical specifications play a key role in promoting highway metrology. It is an important part of the national metrological technical norms, and it is of great significance to evaluate it in the project approval process. Based on the literature research and Delphi method, this paper aims to find out the project evaluation indicators of the highway engineering metrological technical specification project, and provide decision makers with a scientific evaluation method for reviewing projects.
Microstructure of P92 Steel for Main Steam Pipeline of Ultra Supercritical Units after 50,000 h Service
Authors: Xinmei Li , Zhang Zhongwen , Zou Yong , Baoshuai Du , Wei Yuzhong , Yin Zhiyi 
Published: December 2019

Abstract
The microstructure of P92 steel used in the main steam pipeline of ultra-supercritical unit after 50,000 h service was studied by means of metallographic microscope, scanning electron microscope, energy dispersive spectroscopy and X-ray diffraction. The results show that the microstructure of P92 steel is still lath martensite after 50,000 hours of service at high temperature, but the martensite recovers. There are many large-sized M23C6 and Laves phases in the structure, and the aging phenomenon is obvious. The compound of bismuth is small in size and difficult to grow during service, which is beneficial to the improvement of creep rupture strength of P92 steel. The initial particle size of M23C6 and Laves phase is small, which is beneficial to improve the high temperature strength of the material. With the extension of service time, the size of M23C6 and Laves phase increases, which promotes the creep cavity and reduces the creep rupture strength of the material.
Research on Finite Element Simulation of Typical Down Lead of Transformer Substation
Authors: Xiubao Pan , Peng Li , Bin Liu , Jingchao Wang , Yongkun Zhu , Danyu Li 
Published: December 2019

Abstract
To calculate the stress status of equipment terminal exactly, this paper establishes the overall simulation models of two types of down lead structure systems, and compares them with the test result. The result shows that for cross line - down lead model and truss - down lead model, a relatively good effect has been obtained for both of them by using cable element to simulate conductor, and the error between the terminal stress simulation result and the test result is controlled within 15%, which means that the finite element simulation model of this paper is exact and reasonable.
Determination of ground motion parameters by seismic response analysis method of soil layer
Authors: Zhou Chang Xian , Zheng ShaoPeng , Ye YouQuan , Hao  , Wang Ping Fu 
Published: December 2019

Abstract
In this paper, the factors affecting the results of seismic response analysis of soil layers are analyzed by substituting trial calculation for various factors in the engineering example of seismic safety evaluation. In the soil response analysis of building site, the lithology of overburden soil, the sudden change of soil structure (interlayer) and the input shear wave value all have influence on the soil seismic response. Among them, the weak interlayer has significant influence on the peak acceleration and characteristic periodic value of seismic response analysis, while the hard interlayer, simple overburden and the type of bedrock soil have little influence on the seismic response of soil. The following construction projects must be evaluated for seismic safety:(1) Major State construction projects; (2) Construction projects that may cause floods, fires, explosions, massive leakage of highly toxic or highly corrosive substances or other serious secondary disasters after being damaged by earthquakes, including reservoir dams, dikes, oil and gas storage, and storage of inflammable, explosive, highly toxic or highly corrosive substances. Facilities and other construction projects that may cause serious secondary disasters; (3) nuclear power plants and facilities that may cause radioactive pollution after earthquake damage; (4) other construction projects that provinces, autonomous regions and municipalities directly under the Central Government consider to be of great value or have significant impact on their respective administrative regions.
Monitoring Instantaneous Dynamic Deformation of A High-rise Building by Digital Photography
Authors: Liyuan Wu , Liu Xiaodong , Chen Mingzhi , Chengxin Yu 
Published: December 2019

Abstract
In order to make up for the shortcomings of conventional measurement methods in measuring instantaneous deformation of High-rise buildings, in this paper, we propose the method of IS-PPT(Image sequence-photographic proportional transformation)method based on digital photogrammetry to monitor the instantaneous Dynamic deformation information of High-rise building. The specific actions of this method are: Setting up the camera in the right position to make the monitoring object in the center of the image and Setting five stable reference points in the vertical direction of the objective lens at the same time, then selecting feature points as Monitoring points on High-rise building. According to the method of IS-PPT, the pixel variation of the monitoring point on the image plane is transformed into the actual amount of change in-object plane, thus, the actual instantaneous deformation value of High-rise building and its regulation of variation with time are obtained. This method can warn potential dangers in real time and provide data support for maintenance of high-rise buildings timely.