bluuebunny/crossref_metadata_2025_split huggingface dataset:
Suppression of methane/air explosion by ultrafine mono-ammonium phosphate in a 120 L combustion chamber
Authors: Ding Yong , Li Enbo , Hong Tao 
Published: February 2021

Abstract
Experiments on the suppression effect of ultrafine MAP powder in methane/air explosions were conducted in a 120 L combustion chamber with a methane concentration of 10%. The use of ultrafine MAP powder was described with various triggering times and amounts of powder that could influence their effectiveness. The results showed that by increasing the amount of ultrafine MAP powder, the performance varied from promotion to suppression. The suppression action of the powder inhibitor was superior to the disturbance action, as reflected by the curve of explosion pressure and cross-sectional area normalization. By decreasing the triggering time, excellent suppression performance was presented and showed that suppression approached prevention. According to the experimental result, a few powder suppressant and nitrogen could not behave collaborative explosion suppression.
Effects of maize/peanut intercropping system on nodulation of peanut in northwest Liaoning
Authors: Feng Chen , Ma Xiaohui , Feng Liangshan , Zheng Jiaming , Bai Wei , Yang Ning , Xiang Wuyan , Cui Xue , Sun Zhanxiang 
Published: February 2021

Abstract
The maize/peanut intercropping system was considered as a technique, which can both reduce drought risk of sole maize and wind erosion of sole peanut in northwest Liaoning. To clarify the nodulation characteristic of peanut in maize/peanut intercropping system of semi-arid area in northwest Liaoning, a field experiment was conducted at National Agricultural Experimental Station for Agricultural Environment, in northwest Liaoning, China. Including three cropping system (M2P4, M4P4 and Sole peanut) and three densities of maize (2, 3, 4 plants m−2 for M2P4, 3, 4.5, 6 plants m−2 for M4P4) based on the configuration. The results showed that Intercropped with maize significantly promote the nodulation of peanut. The nodule number and nodule size of peanut in M4P4 was significantly more than that of intercrops M2P4 and monoculture. Increasing the proportion of maize in row promotes the nodulation of peanut in maize/peanut intercropping system. The middle density of maize (3 plants m−2) is the best density for peanut nodulation in M2P4 intercropping system. 3 plants m-1 density of maize is better for nodulation of peanut in earlier stage of peanut growth in M4P4 system, while the high maize density (6 plants m−2) is more suitable for peanut nodulation in middle and later periods.
Risk Assessment of Debris Flow in Strong Earthquake Area
Authors: Lin Mushui , Sun Yang , Zhou Junping , Deng Junhong , Zhu Jinyang 
Published: February 2021

Abstract
The construction and operation of the Jiuzhaigou County bidding section of the Jiumian Expressway is affected by debris flow disasters. It is important to scientifically and reasonably evaluate the debris flow risk in the engineering area. Therefore, according to the data of topography, meteorology, hydrology and regional geological structure of the project area, 12 influencing factors, such as regional geological disasters, loose material reserves along the gully and maximum punching amount at one time, are selected as the evaluation indexes of debris flow risk assessment. Based on the catastrophe progression method, a mutation model of debris flow risk assessment suitable for the project area was established. The debris flow risk assessment mutation model was used to evaluate the debris flow risk of 8 trenches in the project area, and the applicability of the model is verified by comparing the actual occurrence history of debris flow in the trench with the evaluation results. The analysis results show that the risk of debris flow in four gullies of Gangou and Xiaganzuo in the bid section project area of Jiuzhaigou County of Jiumian Expressway is extremely dangerous, and the debris flow risk of Shangganzuo gully is severe. These five debris flow gullies are the key objects of debris flow prevention and control during the construction and operation of Jiuzhaigou County bidding section of the Jiumian Expressway.
Catastrophic mechanism analysis of deformation and instability of the layered rock slope
Authors: Li Xiaoshuang , Wang Yunming , Liu Zhifang , Zhao Kui 
Published: February 2021

Abstract
This paper is based on engineering background in the phosphate mine called Jianlinshan belonging to the Yunnan Phosphate Chemical Group limited company. In terms of the deformation and instability characteristics of stratified steep dip rock slope, the slope instability process and intrinsic controlling factor have been analyzed by using the cusp catastrophe model. The excavation open-pit slope stability has been researched with respect to the stress state of the stratified rock slope. The results show the following conclusions. (1) The increase of strata thickness can improve the flexural rigidity of rock mass, and can effectively control the occurrence of slope collapse and buckling. The risk of destabilization of the slope can be reduced by using rock-soil anchorage technology or grading bedding. (2) When the slope rock thickness is fixed, the critical slope length decreases with the increase of the dip angle, and the higher the thickness, the more obvious the decreasing trend; When the dip angle of strata is certain, the critical slope length of the slope increases with the increase of the stratum thickness, and the increasing amplitude decreases. Meanwhile, when the dip of strata is greater than 40°, critical slope length increasing amplitude caused by the thicker thickness of strata tends to coincide. The relevant research results can provide theoretical and technical guidance and advice for the open pit transportation technology of this mining area or mining area with similar conditions.
Analysis of Internet of Things Computer Network Security and Remote Control Technology
Authors: Wang Mei , Zhang Baohua 
Published: February 2021

Abstract
The Internet of Things system is a product of the combination of information technology in the rapid development of computer technology, and it is an important foundation for the development of the information age. But we cannot ignore computer network security issues in the application of the Internet of Things. In order to effectively control the security issues of the Internet of Things, we have to study and analyze the potential security risks in the current Internet of Things computer network. In addition, we should explore reliable network security control measures and computer remote control technology. Only in this way can the further development of the IoT system be promoted.
Research on DC Corona Test of Typical Electrodes and Corona Limited Electric Field Magnitude for Valve Hall Fittings
Authors: Shiling Zhang , Qiang Yao 
Published: February 2021

Abstract
In order to prevent the surface corona of valve hall fittings and obtain the corona limited electric field magnitude, the research designed dc corona test of spherical electrode and ring electrode with the different radius of curvature. The electrodes were used to imitate valve tower shield plate, grading ring, grading ball and grading shield for bushing. By the reason that the uneven electric field of irregular conductor can’t be calculated theoretically or measured accurately, the three-dimensional finite element model is used for simulating calculation. The variation of typical electrode corona inception electric field is analyzed and threshold value of corona inception electric field of valve hall fittings is acquired. With adequate modification, limited electric field magnitude for the project is proposed. The corona inception electric field magnitude of electrical equipment under the equivalent diameter of 200mm is 2000Vmm−1, and that of electrical equipment with an equivalent diameter of more than 200 mm is 1200 V • mm−1.
Discussion on Substation Noise Control Target and Simulation Analysis
Authors: Yang Bo , Chen Libo , Zou Anxin , Luwen Xu 
Published: February 2021

Abstract
Substation noise engineering control is an important environmental protection content of current power grid companies. How to ensure the effectiveness of noise control and reduce environmental complaints and disputes has become an important subject for engineering and technical personnel. This paper analyzes and discusses the “Environmental Noise Emission Standards for Industrial Plants” (GB 12348-2008), and uses the simulation calculations and analysis cases of typical substation noise control to propose the principles and principles of sensitive targets and station boundaries in substation noise control. The analysis method in substation noise control provides reference and reference for the revision of substation noise engineering control technology and related standards.
Evaluation of innovation driven capability and diagnosis of obstacle factors based on comprehensive index method--a case study of Qingdao Marine Industry
Authors: Zhang Xiaoying , Leng Hao , Huang Yaru , Yan Wei 
Published: February 2021

Abstract
China is a big ocean country, and marine economy plays an important role in the national economic system. It is urgent to develop marine resources scientifically, protect marine ecological environment, and improve the quality and efficiency of marine economic development. As the main force of marine economic growth has changed from relying on resources to technological innovation, the evaluation of innovation driven capacity has become an indispensable and important link. Taking the marine industry of Qingdao as the research object, this paper uses the comprehensive index method to construct the evaluation index system of innovation driven ability from three aspects: the basic level of scientific and technological innovation, the input and output of scientific and technological innovation of marine industry, and analyzes the driving capacity and obstacle factors of the current marine industry in Qingdao. The results show that the innovation driven development ability of Qingdao is outstanding, and the innovation driven development ability is closely related to innovation investment, scientific research and innovation environment and other factors. According to the research results, the paper puts forward some measures to further enhance the innovation driven ability.
Analysis of power market simulation methods under the background of re-electrification
Authors: Feng Junshu , Jiao Bingqi , Zhao Jiujin 
Published: February 2021

Abstract
The world is experiencing a new round energy transition from fossil energy to clean energy. To many countries, continuously upgrading electrification level and accommodate more wind power and solar power to achieve re-electrification roadmap, will be a trend and the only way of these countries’ energy transition. In this paper, challenges brought by large-scale wind power and solar power to power system operation are analyzed from the aspects of accommodation, fluctuation characteristics, prediction error, power electronics characteristics and pulling down system marginal cost. Also, key issues of power market simulation methods, such as co-considered day-ahead market and real-time market by use of Security Constrained Unit Commitment (SCUC) model and Security Constrained Economic Dispatch (SCED) model respectively, co-optimized energy and ancillary service market and added rotational inertia verification in SCUC model, are studied.
Study and Application of Heat Self-generated gases Flooding for Enhance Heavy Oil Recovery with Low-frequency High-power Harmonic Wave
Authors: Guowei Qin , Yanzhao Zheng , Rongbo Jin , Jing Wang , Beilei Zhang , Qiao Wang , Mei Wu 
Published: February 2021

Abstract
Heat self-generated gases flooding with low-frequency high-power harmonic wave(LFHPHW) is a new technology combining of LFHPHW enhanced oil recovery, steam flooding, and gas flooding and so on. Its main mechanism is to improve the fluidity and reduce heavy oil viscosity and oil-water interfacial tension with self-generated gases (CO2, NH3, etc.). They can be further reduced by synergism effect with LFHPHW, which can improve the heavy oil fluidity and displacement efficiency to enhance heavy oil recovery. The results of this new technology show that it has many advantages and can enhance heavy oil recovery(EHOR).
Study on the effect of grain refinement of deformable heat treatment on steel properties
Authors: Jin Aining 
Published: February 2021

Abstract
Iron and steel is the foundation and symbol of a country’s industrial strength, which plays an important role in the process of industrial modernization. Because of its high strength and good mechanical properties, it is widely used in all fields of society. Therefore, how to improve steel performance, mass production, reduce steel energy consumption and cost is very important. In this paper, the grain refinement principle of steel deformation-heat treatment and its influence on steel properties are expounded and analyzed. Meanwhile, the experimental data show that grain refinement of deformation-heat treatment has obvious effect and simple method to improve steel properties, which is conducive to the large-scale production of high-performance steel and plays an important role in the industrial development of China.
Research Hotspots and Frontier Analysis of Old Industrial Buildings: A Systematic Review Based on Knowledge Mapping
Authors: Li Huimin , Yu Guangyu , Chen Yabin 
Published: February 2021

Abstract
Affected by adjustment of the industrial structure and environmental pollution control, more and more industrial buildings are idle or even abandoned because they no longer meet the needs of social development. Numerous scholars carry out much valuable research on the reuse of old industrial buildings. We want to know the hotspot and evolution path of old industrial building reuse. Therefore, based on the relevant literature retrieved by WOS, this research uses Citespace 5.6. R3 to obtain a scientific knowledge map about the old industrial building regeneration field. Based on this, the research hotspots of the reuse of old industrial buildings from 2000 to 2019 are analyzed to obtain the current status and characteristics of the research and predict the development trend.
Calculation and seasonal difference analysis of energy consumption and carbon emission of industrial buildings
Authors: Chen Weijao , Hou Lei , Shang Yanwen , Qiao Chunzhen 
Published: February 2021

Abstract
This article focuses on the production stage of industrialized building components. Through the analysis of the measured data, it is concluded that the unilateral carbon emissions generated by the consumption of natural gas in the steam curing stage of the northern factory account for more than 80% of the production process. The difference in natural gas consumption is the energy consumption and carbon emissions in the component production stage. The energy consumption and carbon emissions of the Nanfang (Longxin) plant in summer are higher than the transition season and winter; the power consumption and carbon emissions of auxiliary equipment in summer are close to 20% of the total carbon emissions during the production process, which is the season for energy consumption and carbon emissions in the component production stage The main reason for sexual differences.
Numerical simulation study of overlapping tunnels in soft soil
Authors: Liu Yang , Fu Xin , Yang Minghu , Tang Zhendong , Chen Lu , Liu Yuancai 
Published: February 2021

Abstract
In the process of urban subway shield construction, how to ensure the safety of the newly built tunnel and surrounding buildings is the key issue in the construction. Aiming at the overlapping shield tunneling in soft soil layer, this paper takes overlapped shield tunneling using the overlapping shield tunneling method in a subway section of Kunming Line 6 as the research object, and uses the finite element software ABAQUS to simulate the overlapping shield tunneling. The results are compared with the monitoring data of site construction. The results show that the construction sequence of constructing the lower tunnel first and then the upper tunnel and the condition of grouting and strengthening the soil around the overlapping tunnels can control the settlement of the ground to a large extent.
Study on construction risk and control technology of subway tunnel in soft soil stratum
Authors: Kong Heng , Guo Fei , Zhang Mi , Gao Shenglei , Wang Kaili 
Published: February 2021

Abstract
Taking the shield crossing Huangma road of Beijing new airport line as the engineering background, main construction risks of large section shield crossing Huangma road in soft soil layer were analyzed. Taking the support pressure of excavation face as the research object, the influence of shield excavation on the surrounding soil and surface deformation of the working face were studied, and the corresponding reinforcement measures were proposed. According to the field monitoring data after reinforcement, the settlement trough of 8.8m shield was predicted based on peck formula. The results show that the width coefficient of settlement slot of 8.8 m shield machine varies from 0.41 to 0.46, with an average value of 0.42.
Finite element Analysis on Shear Performance of Bolt connectors of Assembled Composite beams
Authors: Jing Xiuying , Zhou Dongchuan , Lu Senqiang 
Published: February 2021

Abstract
In order to realize the rapid assembly of steel-concrete composite beams, high-strength bolts are used as shear connectors instead of studs. In order to study the shear performance of highstrength bolt connector, the finite element model of push out specimen was established by ABAQUS. The validity of the model was verified and the conclusion that the shear bearing capacity of highstrength bolt connector would be reduced by enlarging the bolt diameter. On this basis, the influence of concrete strength, bolt tensile strength, bolt diameter and pretension on shear bearing capacity of high strength bolt connections were analyzed. The results showed that the shear capacity of high-strength bolt connectors mainly depended on concrete strength, bolt tensile strength and bolt diameter, and is less affected by pretension. The research results have reference value for the application of high strength bolt connectors in prefabricated composite beams.
Research on impact performance of prestressed steel strand
Authors: Ma Su , Li Hongming , Tang Baijian 
Published: February 2021

Abstract
As a common prestressed member, the steel strand has a wide range of applications. Its bearing capacity affects the safety of the whole structure. Once it is damaged, the whole structure will be damaged or even collapsed. As a single tension bearing member, the transverse behavior of steel strand is often ignored. However, in recent years, the impact fracture accidents of steel strand occur frequently, and the research on transverse impact resistance of steel strand is very important. At present, there is no reliable evaluation standard for the mechanical properties of steel strand subjected to impact. The strand is made of several independent wires. Under the action of external load, the stress of each strand is different, and the stress distribution inside the strand is more complex. Under the action of transverse impact, the fracture position and quantity of strands are different, and the failure modes caused by different impact conditions are also different. In order to understand the mechanical performance of steel strand under transverse impact and provide evaluation basis to improve the structural safety, this paper carried out relevant research through test and finite element simulation method.
Research on Drivers’ Behavior Characteristics of Expressway Straight Section under Moderate Rainfall
Authors: Sun Yufei , Xu Jinliang 
Published: February 2021

Abstract
Understanding the behavior characteristics of highway drivers in rainy weather is of great significance to traffic safety. Based on the driving test in the middle rain environment, this paper uses the method of combining the sports index and the driver’s behavior to study the characteristics of the driver’s behavior in the middle rain environment. A total of 15 drivers were recruited in this test to observe the impact of the moderate rain environment on the drivers, and to analyze the correlation of various indicators to summarize the vehicle operation rules on the straight road section under the moderate rain environment. The results of the study show that the speed on straight road sections is generally higher in moderate rain weather, and the driver’s recognition time for signage is longer than in sunny day. Finally, according to the behavior characteristics of drivers in rainy days, the corresponding traffic safety measures are put forward.
The Speed Limit Determination of Tunnel Entrance And Exit Section On Rainy Days
Authors: Ma Huan , Xu Jinliang 
Published: February 2021

Abstract
In order to reduce the number of traffic accidents caused by rainy days on the entrance and exit sections of tunnels, a reasonable speed limit value on the entrance and exit sections of tunnels is proposed to improve the safety of vehicles on these sections. This paper takes passenger cars as the research object, and by exploring the changes of road friction coefficient and visibility in rainy weather, the driving environment parameters under different rainfall intensity are clarified. Taking the visible distance of the driver and the critical state of vehicle sideslip as safety indexes, the speed limit value of the section outside the tunnel in rainy days is obtained, and the allowable speed of the section inside the tunnel is determined by taking the continuity of the running speed as the standard. The study shows that the speed limit value of the tunnel entrance and exit section in rainy days takes visibility as the main limit index and decreases with the increase of rainfall intensity. When the rainfall intensity is greater than 1.5mm/min, the speed limit of the tunnel section is needed.
The Evaluation of the Effectiveness of Existing Safety Facilities in Highway Tunnels
Authors: Shuohan  , Xu Jinliang , Yan Menghua , Gao Sunjian , Wen Hui 
Published: February 2021

Abstract
Known as “the throat of road”, the tunnels endow with semi-enclosed structure, which is a big challenge for the road safety. A large number of safety facilities have been installed in tunnels to raise the driving safety. However, the real effects of these facilities tend to be lack of scientific researches and assessments. Therefore, this paper focuses on the evaluation of the effectiveness of several common safety facilities, including variable message boards, flashing lights, over-speed snapshots, and speed-control humps, aiming to provide some technical references for the design of tunnel safety facilities. In this study, the numerous field experiments have been conducted to collect vehicle speed data at four forward and backward sections of safety facilities, Selecting the difference in the speed before and after the safety facilities as a major evaluation index. On the basis of improved entropy method TOPSIS, the comprehensive evaluation model is built to evaluate the efficiency of safety facilities in tunnels, and the function characteristics and actual effects of various safety facilities are given.