bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Gas Distribution and Migration in Stope Based on Gas Monitoring
Authors: Zhang Yang , Li Huashuo , Guan Yongxing , Tang Shoufeng , Tong Minming 
Published: March 2020

Abstract
If the safe concentration of gas in coal mine exceeds the upper limit, it will bring great risks to coal mine production. Therefore, it is of great significance to study the distribution law of gas concentration on coal face. This paper established the layout plan of gas sensor, measured the gas concentration of each observation point under the wind speed of 3m/s, established the trend surface model of first order to fifth order, and solved the trend surface equation of each order, obtained the best trend surface equation through a variety of testing methods, and studied the gas distribution and migration rules in detail.
Research on layout optimization of freezing pipes based on numerical calculation of hydro-thermal model
Authors: Zhang Song , Zhang Jiwei , Han Yufu , Su Yanlin , Zhang Song , Wen Hanhong 
Published: March 2020

Abstract
In order to study the influence of seepage flow on the development of frozen curtain in the artificial ground freezing project and optimize the distribution of freezing pipes. A coupled hydro-thermal model base on Darcy law and thermal balance equation has established and verified by the model test. The result shows that it can effectively improve the efficiency, reduce the completed freezing time and strength of frozen soil curtain. And the best distance which is all gratefully acknowledged between freeze pipe in upstream and section of original design freeze pipes is 75% of the distance of freeze pipes. In the end, the influence range of one pipe in upstream will be 3∼4 times the distance of freeze pipes.
A Combustible Dust Cleaning Device and Application
Authors: Li Yanping , Li Yong , Li Yunqi , Fang Liu 
Published: March 2020

Abstract
Flammable fine dust is dangerous to working environment. It is harmful to the health of workers. In this paper, a high efficiency combustible dust cleaning device is proposed. Its water consumption is about 0.289 kg/m3, and the removal rate of dust with particle size less than 5 m is higher than 99%. This new cleaning device can be used in coal conveying system of power plant and other workplaces.
Preliminary Study on the Evaluation System of Technological Innovation Index for the Central Enterprises of International First-class Enterprises
Authors: Chang Yan , Shi Yongpeng 
Published: March 2020

Abstract
The State-Owned Assets Supervision and Administration attached great importance to the construction of technological innovation capabilities of central enterprises, and clearly proposed to study the evaluation index system of technological innovation capabilities of central enterprises, carry out evaluation of technological innovation indexes, and guide and encourage enterprises to upgrade the level of technological innovation. Technological innovation has become a powerful driving force for continuously promoting the scientific development of central enterprises. It is of great significance for accelerating the improvement of the level of technological innovation of central enterprises to carry out the evaluation of central enterprises’ technological innovation index, establish an effective mechanism to guide technological innovation of all departments, and provide scientific decision-making basis for technological innovation of central enterprises. The core of this research revolves around the technology innovation index of central enterprise for building a world-class enterprise. First, systematically sort out the characteristics of technological innovation in world-class enterprises. Second, analyze the characteristics of technological innovation of central enterprises and the shortcomings of current state-owned enterprises’ technological characteristics compared with first-class enterprises. Third, build a technology innovation index evaluation system of world-class enterprises.
Study on Combustion Dynamic Performance of Woody Plant Based Hydrocarbon Fuel
Authors: Zhang Aihua , Wang Qin , He Yidan , Lai Pengying , Miu Yifu , Xiao Zhihong 
Published: March 2020

Abstract
Woody plant oil is a kind of biological material which occupies an important position. It has many characteristics, such as wide variety, wide distribution, large yield and reproducible. The thermochemical conversion technology of woody vegetable oils is an efficient conversion route, and the obtained hydrocarbon-rich fuel can maximize the proximity to existing fossil fuels by esterification and acid reduction. At present, the research on the combustion performance of hydrocarbon rich fuels is relatively few. In this study, B20 (hydrocarbon enriched fuel 20%, 0# diesel 70%) and 0# diesel were used for reference. The results show that, under the same conditions, the emission performance of B20 (smoke, CH, CO, NOx) of the woody plant based hydrocarbon fueled fuel is better than that of 0# diesel. The dynamic performance (torque performance, power performance) is basically equal to that of 0# diesel, and it can protect the ecological environment well, and has a good application prospect.
Study on Production Efficiency of Flue-cured Tobacco in China Based on DEA-Malmquist Model
Authors: Huang Dongbing , Wang Xinlei 
Published: March 2020

Abstract
Based on the input-output data of flue-cured tobacco production in 18 provinces of China from 2005 to 2016, the flue-cured tobacco production efficiency was calculated and analyzed. The results show that: Firstly, the total factor productivity (TFP) of flue-cured tobacco in China shows a growth trend, the main reason of the growth is the growth of the scale efficiency. The pure technical efficiency and the technical progress play a negative role to the promotion of total factor productivity. Secondly, in the provinces where total factor productivity declines, the leading factors of total factor productivity declines are different. For the provinces where total factor productivity increases, the leading factor of total factor productivity growth is the improvement of technical efficiency. Thirdly, the change of annual total factor productivity growth rate is unstable because of the uncoordinated change of technological progress and technological efficiency. We can improve the flue-cured tobacco productivity by large-scale production, improving management level, introducing advanced production technology and strengthening technological innovation.
Adsorption mechanism of azophloxine in water by Fe3O4-chitosan composite material
Authors: Sun Li , Song Xiaoxiang , Yuan Zhigang , Liu Ying , Gong Wenbang , Xu Wei , Mei Shunqi 
Published: March 2020

Abstract
Fe3O4-chitosan composite material was synthesized as adsorbent. The effect of solution pH value, initial concentration of azophloxine and adsorption time on the adsorption of azophloxine onto adsorbent was studied. The results show that Fe3O4-chitosan composite material can be magnetically separated before and after adsorbing azophloxine. It was found that the peak intensity of azophloxine was the strongest under weak acidic conditions, and the peak position hardly shifted. In the process of adsorption, it was found that Fe3O4-chitosan composite material adsorbing azophloxine by the surface electrostatic attraction. The optimum equilibrium adsorption capacity is at initial solution pH 6, and the equilibrium adsorption capacity is very close under weak acidic conditions. The pseudo first-order and pseudo second-order kinetic models were applied to experimental data. The adsorption process followed the pseudo-first-order kinetic model, which implied that the adsorption process was physical adsorption. The correlation coefficient for the first-order kinetic model was obtained greater than 0.99571 at room temperature, and the theoretical equilibrium adsorption capacity qe,cal value also agreed very well with the experimental equilibrium adsorption capacity qe
value in the case of pseudo first-order kinetics. It is suggested that Fe3O4-chitosan composite material has a wide application prospect in the removal of dyes as adsorbent.
Study on the influence of the number of broken windows on the fire of running trains
Authors: Ma Shuo , Liu Wan Fu , Han Wei Ping , Xia Jian Jun , Liu Ya 
Published: March 2020

Abstract
With the rapid development of Railway Construction in China, the safety of railway trains has aroused people’s concern while solving the traffic problems of passenger flow in various cities. According to the principle of relative motion, this experiment studies the fire burning characteristics of trains at different travel speeds by changing the wind turbine frequency to adjust the wind speed. The experimental results show that when the train window breaks during travel, the fire heat release rate increases with the increase of running speed. The growth coefficient of fire increases with the increase of running speed. With the increase of train running speed, the variation of the temperature extremes of the ceiling and the temperature series on both sides of the fire source is not very large.
Screening of the best formula for flame type high energy burner
Authors: Chen Jialin , Guo Tao , Ding Wen , Zhang Sheng , Wang Qiong , Yao Miao 
Published: March 2020

Abstract
In order to explore the best formula of flame-type high-energy burner, this paper selects 7 groups of flame-type high-energy burners with good stability, high energy and a wide range of raw materials based on the existing literature and patents. The Gibbs free energy Values of 7 groups of formulations at different temperatures were calculated by using the chemical thermodynamic formula, and the changes in Gibbs free energy Values of 7 groups of formulations were drawn, which provided a basis for the calculation of reaction rate k value by Eyring equation. Then, according to the calculation theory of chemical reaction calorific value, the heat of reaction of 7 different formulations at different temperatures was calculated. The results show that the Gibbs free energy value of Al/MnO2 in the seven groups of formulations is much smaller than that of the other groups in the same reaction temperature environment, and decreases with increasing temperature. According to the Arrhenius formula and the Eyring equation, the reaction rate of Al/MnO2 is the fastest in each group. When the other conditions are constant, the reaction enthalpy of Al/MnO2 is the smallest in each group, therefor the heat released by the reaction is the most. In summary, under the same quality conditions, the Al/MnO2 flame type high energy burner formulation has the fastest reaction rate and the most heat release, which provides theoretical guidance for experimental design and practice.
Effect of Fuel Ignitability and Volatility on Ultra-Fine Particulate Emissions in Diesel Engine
Authors: Wang Xiaodan , Tang Xintong , Yang Jing , Ren Xiaoping , Liu Jianhong 
Published: March 2020

Abstract
The effects of fuel components on particulate matter emissions were studied on a high pressure common rail diesel engine fuelled with different diesel fuels. Six kind of diesel fuels with various volatility and ignitability were selected in this test. Particle number, composition and morphology were studied with various physicochemical property diesel fuels. The results show that lower ignitability fuel and stronger volatility fuel could reduce the accumulation mode particle number, while the nucleation mode particle number would increase. Meanwhile, the proportion of DS might reduce with the SOF increase. With the decrease of the fuel cetane number, the number of large cluster particles in the exhaust decreased obviously.
Preparation of copper nanowires conductive films by using cuprous oxide nanowire as template
Authors: Liu Weixiao , Wang Yanyan , Dong Lei , Huang Manman , Ying Shuyang , Peng Changsi 
Published: March 2020

Abstract
Polypyrrole-coated cuprous oxide nanowires with a large aspect ratio were prepared via the hydrothermal reduction of copper acetate with pyrrole. Initially, the nanowires were transferred onto a glass substrate by suction filtration and embossing. A copper nanowire conductive film can then be obtained after high temperature annealing reduction and transferred onto a flexible substrate via hot press transfer. The product was analyzed via X-ray powder diffractometry, scanning electron microscopy, and transmission electron microscopy. The visible light transmittance and the surface resistance of the sample were measured by employing an ultraviolet-visible spectrophotometer and a four-probe surface resistance meter, respectively. The effects of the annealing temperature, of the time, the dispersion of the square resistance, and the transmittance of the conductive film were investigated. The results show that the conductive film exhibits a high visible light transmittance (82%) and a low sheet resistance (62 Ω/sq) upon annealing at 700 °C for 300 seconds.
Deep Water Oil & Gas: New Opportunities and Suggestions for Chinese Oil Companies
Authors: Li Jia , Peng Yun , Sun Dufen , Yi Jiexin , Wang Kai , Liang Tao 
Published: March 2020

Abstract
The rising production of Deepwater are reshaping the global market landscape. Global Deepwater production will account for 22% to 25% of international supply in 2035. The role of Deepwater is significant in the future. The oil companies have entered Deepwater fields extensively. New opportunities are emerging, and the number of tenders for deep water blocks is increasing. Deepwater terms are changed to attract more exploration investment to the sector. The efficiency of Deepwater operation has been greatly improved through project optimization and technological progress. Chinese oil company should participate in international competition and cooperation actively, extend and upgrade the whole offshore industry chain to seize the new opportunities.
A Comparison of Two Different Surface Modifications on the Properties of Poly (p-phenylene benzobisoxazole) Fibers
Authors: Liu Lanlan , Li Wenbo , Gu Su , Zou Dehua , Li Zhihua , Yang Jiani 
Published: March 2020

Abstract
Poly (p-phenylene benzobisoxazole) (PBO) fibers were modified by coupling agent 3-Glycidoxypropyltrimethoxysilane (KH-560) and polyphosphoric acid (PPA) respectively. The influence of two treatments on the properties of PBO was investigated, including surface morphology, water absorption and breaking strength retention ratio. The results indicate that the surface roughness of PBO fibers can be increased by both KH-560 and PPA. With the increase of PPA mass fraction, the retention rate of breaking strength of PBO fibers gradually was decreased, and the water absorption rate was gradually increased. Notably, KH-560 can effectively improve the water absorption rate without deteriorating mechanical properties of PBO fibers simultaneously. Compared to treatment by PPA, KH-560 has a milder effect on the performance of PBO fibers, which makes it easier to control the degree of surface modification.
Mechanism of wind power and solar photovoltaic power participation in the electricity spot market considering the guaranteed capacity factor
Authors: Tang Chenghui , Zhang Fan 
Published: March 2020

Abstract
At present, with the increasing penetration rate of renewable energy in China, it is necessary to consider renewable energy in the electricity spot market. However, wind power, solar photovoltaic power, etc. are the kind of “priority power generation”, which uses the catalogue price for the part of the guaranteed capacity factor and the market price for the rest part. The above two pricing mechanisms need to be coordinated in renewable energy consumption. This paper proposes a mechanism of renewable energy participation in the electricity spot market, which enables renewable energy participating in the spot market as other conventional energy sources under the policy of “priority power generation”.
Domestic and Foreign Energy Internet Construction Experience and Enlightenment
Authors: Li Nan , Zheng Kuan 
Published: March 2020

Abstract
In this paper, firstly the overall energy structure and energy power development route of major developed countries are analyzed, and practice situations of energy internet engineering of different countries are analyzed by taking the United States, Germany and Japan as an example. Secondly, the overview, technical scheme and comprehensive benefits of typical domestic energy internet projects are analyzed. Finally, experience is summarized and suggestions are put forward for China’s regional energy internet construction in terms of key technologies, operation model and pilot construction.
Recent progress in conversion of carbohydrate biomass and their derivatives to γ-valerolactone
Authors: Guo Yalin , Yang Qiancai , Guo Pengfei , Yao Guodong , Jin Fangming 
Published: March 2020

Abstract
Biomass, the only renewable resources of fixed carbon, shows great potential to ease the pressure on fossil energy crisis. In recent years, conversion of carbohydrate biomass into value-added products has been vastly reported. Gamma (γ)-valerolactone (GVL), which is one of the platform chemicals, has been extensively used in industrial production. Recent trends proposed an eco-friendly processing using water and biomass-derived materials as hydrogen sources instead of high-pressure and high-purity gaseous hydrogen, avoiding storage, transportation and operation risk in the production. This review summarizes the progress in GVL production from carbohydrate biomass and highlights the novel green approach by using green reductants and non-noble-metal catalysts.
Research on Thermal Out of Control of Lithium Battery in New Energy Vehicles
Authors: Wang Lili , Yang Xuefeng , Wang Qiang , Tian He 
Published: March 2020

Abstract
Lithium-ion batteries are widely used in the new energy automobile industry due to their high energy density, fast charging, high cycle life and no pollution. However, in actual use, lithium-ion battery systems may cause deflagration of the power battery system due to thermal runaway. In this paper, the causes of the thermal runaway of the power battery system are studied, and the existing related suppression methods at home and abroad are compared and analyzed, and the advantages and disadvantages of the relevant suppression methods are obtained.
Study on the surface activity and aggregation behavior of a polyether surfactant for acidification
Authors: Ning Mengmeng , Wang Peng , Xu Zhengdong , Huang Bohua , Li Ning , Kong Weizhong , Jia Jiangfen , Zeng Zhiguo , Liu Qilun 
Published: March 2020

Abstract
Four kinds of biological phenolamine resin block ethers (BPPC) surfactants with different molecular weights were synthesized from biological phenol, formaldehyde and polyvinyl polyamines. The structure of BPPC was characterized by Ft-ir and H NMR. The surface properties of BPPC polyether surfactant and the change curve of surface tension with concentration in aqueous solution at different temperature were studied by surface tension method. The results showed that the critical micelle concentration (cmc) of BPPC and the γcmc increased with the increase of EO content. With the increase of molecular weight, number of branched chains and length of branched chains, cmc and γcmc decreased. The thermodynamic calculation results show that BPPC shows enthalpy/entropy compensation during micellization in aqueous solution. The compensation temperature T was all (300±2) K, and with the increase of molecular weight, number of branched chains and length of branched chains, the stability of BPPC formed in aqueous solution was enhanced.
Experimental Analysis and Research on New Concrete Multi-ribbed Beam Hollow Floor
Authors: Wang Dunqiang , Li Jingyu 
Published: March 2020

Abstract
The new concrete ribbed beam hollow floor cover based on the two-way ribbed beam is suitable for projects with large loads or large spans on the upper part. This paper mainly introduces the characteristics and composition of concrete ribbed beam hollow floor, collates and analyzes the test data obtained from the static loading test of the floor, obtains the structural performance of the test piece, and obtains the vertical overall displacement of the floor. The vertical displacement of the mid-span and the development of the crack, the ultimate bearing capacity of the hollow slab with the rib beam is obtained through the failure test. Under the normal load, the new ribbed hollow floor has good integrity. It is concluded that the hollow ribbed hollow floor cover has the characteristics of large bearing capacity and good overall rigidity.
Entropy Analysis of Two Phase Flow Pattern Identification in Vertical Tube
Authors: Lu Kun , Ma Longxin , Li Gen , Shang Wei , Feng Yixuan 
Published: March 2020

Abstract
This paper aims to analyze the time domain marginal spectral entropy of differential pressure signals collected from the gas-liquid two-phase flow pattern vertical tube bundle channel on the experimental platform. By comparing the visualized and measured differential pressure signals, four flow patterns were found, namely, bubble flow, bubble-mixed flow, agitated flow, and annular flow. The marginal spectral entropy values of the four flow patterns are calculated, and it is found that the spectral entropy distribution regions of the different flow patterns are different. Putting the aforementioned four flow patterns that is regarded as the feature quantity into artificial neural network support vector machine for flow pattern recognition. The experimental results show that the marginal spectral entropy can better reflect the flow difference between different flow patterns. The support vector machine has the advantages of fast calculation speed and high recognition rate. The overall recognition rate of the four flow patterns (the transition flow is included) is as high as 95.31% by combing the marginal spectral entropy with the support vector machine, which is suitable for online identification of flow patterns.
Erosion Resistance of Ceramic Particle Reinforced MMC Coating
Authors: Fang Jianjun , Li Yanping 
Published: March 2020

Abstract
There are relevant reports on preparing TiB2 particle reinforced metal matrix composite (MMC) anti-wearing coating by plasma spraying and HVOF spraying methods successfully. The research uses high velocity electric arc spraying with low cost and convenient operation to prepare four TiB2 particle reinforced composite coatings (MMC) with high bonding strength and uniform tissue. The results indicate the coating has excellent erosion wearing resistance.
Experimental Study on Heat Transfer Performance of White Smoke Reduction Heat Exchange System
Authors: Wang ZhenHuan , Zhao XinXue , Kwon YoungChul 
Published: March 2020

Abstract
In the present study, the white reduction system was designed and manufactured to evaluate the performance of a heat exchange system using a wave heat exchanger. The reducing effect of white smoke and the amount of heat recovered from cooling water were investigated experimentally using the cooling and dehumidifying method. The white smoke reduction system consists of two parts; the generating part and the reducing part of white smoke. When the air-water heat exchanger (A/W) and the SA (supply air) induced draft fan (SA Fan) are simultaneously activated, From the experimental results, we can see that the absolute humidity reduction rate of EA (exhaust air) was 82.9%, and the temperature rate of EA was 68.1%.