bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the preparation technology and high temperature oxidation characteristics of SiB4 powders
Authors: Jing Yang , Junyou Chen , Min Zhou , Yanyun Zhao , Qingmeng Zhang 
Published: August 2021

Abstract
High purity SiB4 powder is the key raw materials for high temperature resistant coating of rigid ceramic insulating tile, which plays the role of forming a dense coating and self-healing in the coating. Therefore, to obtain SiB4 powders with high performance and high purity at the same time can solve the problem of raw materials for high temperature resistant coating in China. However, the preparation process of SiB4 powder is complex, and no domestic manufacturer can produce it, which greatly limits the development of related industries in China. The relationship between SiB4 phase purity and boron-silicon ratio of raw materials, particle size and sintering process parameters in the synthesis of high-purity SiB4 powders was explored. The experimental results show that the yield of SiB4 can be significantly improved and the decomposition of SiB4 can be inhibited by adjusting the crystallinity of boron powder, particle size of raw material, sintering process parameters and the ratio of boron to silicon. When 1μm boron powder and 1μm silicon powder are used, the ratio of boron to silicon is 3.5:1, and the sintering process is 1320 °C - 2h, the high purity sib4 powder with only SiB4 phase detected by XRD phase analysis can be prepared after acid washing. On this basis, the high temperature oxidation characteristics of the prepared SiB4 powder were studied. The experimental results show that SiB4 powder can be oxidized at 1100 °C to form B2O3-SiO2 glass phase, which proves that it has better high temperature oxidation performance. In conclusion, it was proved that the prepared SiB4 powder had high purity and excellent high temperature resistance, which could be used for further production research.
Development and application of ZDY4300LF narrow split drilling rig
Authors: Yanjie LONG 
Published: August 2021

Abstract
The inconvenient drilling rig relocation, stabilization and azimuth adjustment lead to many problems in the construction of gas drainage drilling in narrow roadway, such as long auxiliary time, labor intensity of workers, low comprehensive drilling efficiency. Through the innovative layout, the power unit and the drilling unit are respectively arranged on two crawlers, and the ZDY4300LF narrow-body split crawler drilling rig is developed. The drilling rig adopts a modular design idea, Arranged the pump station and console on the pump truck. The feed revolving device and the stabilizing device are arranged on the drill carriage. The drilling rig and the pumping station are connected by high-pressure hoses. When drilling for gas drainage, the location of the drilling rig and pump truck can be arranged according to the terrain conditions to obtain the best orientation for the drilling construction. The industrial test of the drilling rig shows that the ZDY4300LF narrow-body split crawler drilling rig has the characteristics of compact structure, convenient operation, and convenient moving and relocation, which can solve the problem of gas drainage in narrow tunnels in underground coal mines. Industrial test of drilling rig shows that ZDY4300LF narrow split crawler drill has the characteristics of compact structure, convenient operation, convenient moving and moving, etc.
Finite Element Simulation of the Cooling Process of H-shaped Steel after Circular Nozzle Impinging
Authors: Zhiyu Gao , Jianzhong Xu 
Published: August 2021

Abstract
ANSYS fluent, a finite element numerical simulation software, was used to establish a three-dimensional model of the H-shaped steel web under the impinging impact of nozzle jet. A numerical stimulation analysis was conducted on the mode of water flow and the heat transfer of the H-shaped steel web. In the model, the finite volume method was used to discretize the model into a tetrahedral unstructured grid, the multi-flow VOF model and the achievable K-e model were used to solve the Reynolds average N-S equation, and the numerical solution method adopted the PISO algorithm. This paper aims to calculate the heat transfer performance of the ultra-fast cooling process of the H-shaped steel web under different boundary conditions, as well as explore the influence of impinging time on the distribution of water volume and temperature fields of the web by simulating the cooling process of H-shaped steel web with circular nozzle jet.
Extraction of centerline of large-format laser stripes against ambient light interference
Authors: Jun WANG , Wei CHENG , Wen-Long LI , Yi-guang Zhang 
Published: August 2021

Abstract
In order to carry out real-time 3D reconstruction of large components in the outdoor environment, this paper proposes a laser stripe centerline extraction algorithm that is resistant to ambient light interference. The median filter is used to preprocess the laser stripe to be extracted, and the Rosenfeld thinning and least square fitting algorithm are organically combined to extract the centerline of the laser stripe. Experimental results show that this method can effectively avoid strong light interference and accurately obtain the centerline of the laser stripe to be extracted.
Effect of Cr on Corrosion Performance of Steel Bar in Chloride Environment
Authors: Wang Baoshan , Zhang Hongliang , Liu Xin , Ma Jian , Feng Guanghong 
Published: August 2021

Abstract
In this article, microscopy observations, thermodynamic calculation and dry–wet cyclic corrosion test were carried out, and microstructure, properties and corrosion resistance of high strength rebar with different amounts of Cr were studied. The results show that Cr addition restrains the pearlite transformation and increases the phase change temperature range of bainite, and the Cr-contain rebars show higher pitting corrosion resistance. When the Cr content is in the range of 1–3.5%, the Cr-contain rebars show better corrosion resistance than Cr-free steel in the beginning of corrosion and the corrosion resistance is correlated positively with Cr content. As the corrosion time going, Cr-contain rebars have high corrosion rate than Cr-free steel and corrosion rate is also correlated positively with Cr content.
Experimental Research on 3D Printing Process of Square Hole
Authors: Lianghua Zeng , Lin Li 
Published: August 2021

Abstract
The paper designs a square hole model and uses a delta3D printer to carry out printing experiments with different process parameters. It mainly conducts experimental research on four process parameters, including printing speed, layer thickness, filling density and platform temperature. The paper carries out the analysis of the influence of process parameters on the external dimensions of the hole, the inner depth of the hole, etc., and graspes the law of the influence of different process parameters on various sizes in order to provide a certain reference for the research of the 3D printing process of special parts.
Effect of B element on Fe-10Cr-B alloy
Authors: Gao Jing , Zhao Yingfan , Tong Weiping , Chen Chu , Zhu Lin 
Published: August 2021

Abstract
In this paper, Fe-10Cr-B alloys with different B content were prepared by the method of liquid phase sintering. Optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), Rockwell hardness tester were used to investigate the influence of B element on the structure, phases and macro-hardness of the Fe-10Cr-B alloys. The results show that the hardness of alloys with different B content gradually increases with the increase of B content in the alloy. When the B content is 2.5 wt.%, the hardness of the alloy reaches the maximum value of 61.8HRC. A further increase in the B content will lead to a decrease in the macroscopic hardness of the alloy sample. The alloy with B content of 2.5wt.% is mainly composed of metal matrix and M23 (C, B)6 boron-carbides. The Cr and B elements are mainly enriched in boron-carbides.
Tribological behavior of WC-4.32MgO-3.68B2O3 composite
Authors: Lai Jiaming , Li Jingmao , Zhu Dezhi , Liang Liang , Qu Shengguan , Li Huiyun , Li Xiaoqiang 
Published: August 2021

Abstract
WC-4.32MgO-3.68B2O3 composite material was prepared by Spark plasma sintering technology, and then Si3N4 ball was used as the counter-grinding material to study the friction and wear behavior under different loading conditions by means of fretting friction. The research results show that: the distribution of the second phase has a significant effect on the wear behavior of the composites. During the fretting friction process, second phase particles peeled off from the structure, causing the abrasion of the matrix to increase. The research found that with gradually increase of the load, the friction coefficient of the material gradually decreases, but the degree of wear gradually increases. The number of furrows also increased significantly, which was related to the wear degree of convex on the surface of the materials. It can be observed from the wear scar that the main wear mechanisms of composite materials are abrasive wear and oxidative wear.
Structure and function of one-dimensional two-way pneumatic flexible bending joint
Authors: Wang X , Geng D X , Zhang L Z , Sun G D , Xu W Z , Wang P 
Published: August 2021

Abstract
In order to solve the problems of comprehensive flexibility of robot arm, and expand the application field of service robot and improve the safety, a one-dimensional two-way flexible bending joint is developed by using the self-developed pneumatic artificial muscle. The relevant theoretical model is established and the relevant experimental analysis is carried out. The experimental results show that the bending joint can realize one-dimensional two-way bending motion and the bending angle of the joint can be controlled by adjusting the gas pressure; when the air pressure difference between the two sides of the leaf spring is 0.22Mpa, the maximum bending angle of the joint reaches 74.12 degrees; the forward and reverse bending of the joint are consistent, and the joint bending curve is similar to the arc.
Discussion and analysis on corrosion causes of metallic components used in transmission tower
Authors: Hao Chen , Wentao Tian , Yang Guo , Zhihao Zhang , Haolun Bai 
Published: August 2021

Abstract
With the rapid development of power grid and the continuous aggravation of heavy industry pollution, more and more attention would be paid to the corrosion of metallic components of transmission line. The chemical and electrochemical corrosion of transmission tower and its fittings would shorten the service life. Therefore, it requires regular anti-corrosion coating treatment or even overall replacement, which not only wastes a lot of financial and material resources, but also causes safety accidents. In this paper, different testing methods such as macro inspection, metallographic analysis and energy spectrum analysis were adopt to investigat and analyse corrosion behaviour of cotter pin, fitting, guyed rod and angle steel used in transmission tower. Additionally, corresponding anti-corrosion measures were put forward in order to improve the anti-corrosion performance of the metallic components and guarantee the safety and stability of transmission line.
Research and Method for In-line Inspection Technology of Girth Weld in Long-Distance Oil and Gas Pipeline
Authors: Chen Pengchao , Li Rui , Fu Kuan , Zhao Xiaoming 
Published: August 2021

Abstract
With the increasing demand for energy, long-distance oil and gas pipeline has become the main mode of transportation of oil and gas resources. High pressure, inflammable and explosive medium, complex and changeable route environment and other factors make the safe transportation of pipeline concerned. The girth welds of oil and gas pipeline have always been the weak part of the pipeline due to the technical level during the construction, on-site welding practices and operation environment, and the girth weld cracking is one of the main failure forms of oil and gas pipeline. It is an effective way to ensure the safety of pipeline to adopt various advanced and targeted inspection to identify pipeline defects, judge the types of defects, and then carry out safety evaluation and maintenance. This paper analyzes the main failure factors of girth weld of oil and gas pipeline, and systematically summarizes the content and methods of various in-line inspection on girth weld in view of these failure factors, so as to provide reference for the development and application of in-line inspection technology on girth weld of oil and gas pipeline.
Research on crack monitoring technology of multilayer structure based on TMR-eddy current sensor
Authors: Xianghong FAN , Jian YU , Tao CHEN 
Published: August 2021

Abstract
The flexible eddy current array sensor has the characteristics of flexibility, bendability and light weight, which has a great application prospect in the field of structural health monitoring. The traditional flexible eddy current array sensor is affected by the skin effect and the crack monitoring depth is relatively low. This paper proposes an eddy current array sensor which uses TMR (tunnel magneto-resistance) sensor as sensing channels. It reduces the excitation frequency and increases the eddy current skin depth. The TMR sensor realizes the quantitative monitoring of cracks by the array arrangement. First, the finite element model of the sensor is established, and the influence of the cracks on the different layers of the multilayer structure on the magnetic induction intensity at the test point is analyzed. The simulation and results show that when the crack passes through the sensor, the magnetic induction intensity at the three test points changes in sequence and gradually increases to the maximum value. The direct relative position of the maximum value of the three test points is approximately the same as the distance among the test points. Then, the simulated crack growth experiment of the corresponding sensor is carried out. The experimental results show that as the crack grows, the signals of the three TMR sensors on the eddy current sensor change in sequence, and the distance between the characteristic points is consistent with the distance between the TMR sensors. The output voltage of the sensor decrease with the crack depth increases. The experimental results are consistent with the simulation results, which further verifies the correctness of the simulation model.
Identification and compensation of stiffness and damping between short and long stroke in wafer stage
Authors: Yang Xu , Zhang Ming , Cheng Rong , Cheng Rong , Zhu Yu 
Published: August 2021

Abstract
The disturbance of cable force is an important aspect that should be taken into account for precision motion systems involved in CNC machine tools, wafer scanners, etc. In this paper, unlike paying attention to the cable force loaded on long stroke in previous works, the disturbance between long and short stroke had been analyzed in details. To minimize the disturbance force loaded on short stroke of motion system, a disturbance model identification and the corresponding compensation approach method was proposed. A two-step identification in frequency domain was developed such that the parameters of stiffness and damping between long and short stroke can be estimated. Then a state feedback method using ESO and estimated parameters had be applied to compensate the disturbance, which improved the servo performance of short stroke significantly. Finally, the effectiveness of the proposed method is illustrated through numerical simulation.
Key Technology of Directional Drilling for Water Prevention and Control of Bottom plate Limestone in Zhangji Coal Mine
Authors: Lei HAN 
Published: August 2021

Abstract
The coal of group A in Zhangji Coal Mine is seriously threatened by limestone water damage. we use the directional drilling equipment to construct along the strata long drilling and explore the limestone aquifer of the working face bottom plate. According to the characteristics of the formation, the directional drilling casing hole section, rotary drilling hole section, directional bevel hole section, and directional stability The construction methods and key technology of the inclined hole section are analyzed and researched, and the 1414A working face is selected for directional exploration drilling for practical verification. The results show that the directional long drilling technology realizes the full coverage exploration of the working face bottom plate. The target layer has a high drilling encounter rate. The one-time exploration distance is long, which effectively solves the safety risk caused by the bottom plate limestone water damage to the working face safety production. Realizing the promotion of directional drilling equipment in the field of water prevention and control in Huainan Coalfield.
Fault Diagnosis of Rolling Bearing Based on Local Mean Decomposition and Transient Extracting Transform
Authors: Zhao ZhiChuan , Chen ZhiGang , Chai Long , Jang YunLong 
Published: August 2021

Abstract
To solve the problem of inconspicuous feature extraction when LMD method is used to extract rolling bearing fault characteristic signals, A fault feature extraction method based on Local Mean Decomposition (LMD) and Transient- Extracting Transform (TET) was proposed. Firstly, the rolling bearing fault signals were processed by LMD and the feature components with rich fault information were screened out by using the kurtosis values. Then, the secondary feature extraction and envelope analysis of the acquired components were carried out by using TET method. The experimental results showing that this method can extract the pulse characteristics of the impact signal of rolling bearings efficiently, and is suitable for the fault diagnosis of rolling bearing.
Structural design and optimization of wellhead platform for coal mine rescue rig
Authors: Dong-sheng LI 
Published: August 2021

Abstract
The existing ground emergency rescue truck-mounted drilling rig integral wellhead platform has the following disadvantages: inflexible structure form, small opening aperture, difficult assembly and disassembly, and cannot meet the lowering of large diameter drill bits and casing. In response to the above-mentioned shortcomings, it is proposed that a general scheme of modular large-opening intelligent wellhead platform for vehicle-mounted drilling rigs which combines the requirements of the rescue construction. The modular wellhead platform has the characteristics of fast centering, clamping, automatic leveling and meeting the requirements of multi-series large diameter drilling tools. The numerical simulation method is used to analyze the U-shaped wellhead platform, and an optimized structure is proposed based on the analysis results of the original structure. The results show that the stress of optimized structure is better than that of original structure, which provides important support for product design.
Diagnosis method of turbine blade loosening
Authors: Niu Qingliang , Gong Yuli , Tian Guocheng , Liu Chuanling 
Published: August 2021

Abstract
Abnormal vibration of low-pressure rotor occurred after low-pressure cylinder cutting transformation of 330MW steam turbine generator unit in a power plant. Through the analysis of vibration data, the vibration spectrum was mainly manifested as low-frequency component of 18Hz, which fluctuates with time cycle, and it was judged that it might be related to the loosening of low-pressure rotor blades. After 6 months of operation, routine inspection after cylinder cutting showed that there were three loose roots and worn top steam seals on the secondary last stage blades of low pressure rotor. After repairing the blades, the abnormal vibration problem of the low pressure rotor of the turbine generator set was successfully solved.
Research Status and Development Trend of Coal Mine Tunnel Drilling Rig in China
Authors: Baizhan Gao , Qiyue Kang , Pengbo Xu 
Published: August 2021

Abstract
Aiming at the new progress and new trends of coal mine tunnel rigs in China, this paper introduces the development of conventional coal mine tunnel rigs, discusses the application of new technologies such as directional drilling and remote automatic control in the development of coal mine tunnel rigs, and points out the development trend of coal mine tunnel rigs in China. According to the development of domestic coal mine tunnel drilling rigs and related technologies, it is of great significance to construct intelligent drilling face and comprehensively improve the adaptability and reliability of mine tunnel drilling machine to ensure the safety and efficient production of coal mine.
Intelligent Service Scheduling Decision Technology under Artificial Intelligence Technology
Authors: Shi He , Cao Guohua , Ma Guoqing , Fan Junhua , Duan Jingsong , Bai Jimeng 
Published: August 2021

Abstract
The intelligent production line is a new intelligent production line resource formed by highly integrating modern sensor technology, communication technology, information technology, computer technology and control technology on the large physical real basis of the existing production line. It can finish data acquisition, information processing, dynamic virtual reconfiguration of variable batch production line, embedded algorithm, algorithm optimize the management of the production line manufacturing field, change the dynamic virtual reorganization of the mass production line, and become the choice of the development direction of the next generation of new production lines for mankind. Scheduling is the nerve center of the production line virtual reorganization system. The traditional main auxiliary decision-making tool management system can no longer fully meet the requirements of production line operation monitoring in the new environment, so the construction of an intelligent scheduling system is also one of the important contents of the construction of the production line virtual reorganization. Based on this, this article explores and researches intelligent service scheduling decision-making technology under artificial intelligence technology. The research topic of this article is intelligent scheduling of production lines, so this article first analyzes the current research status of intelligent service scheduling and decision support systems; then conducts research based on Agent decision support systems, and analyzes the framework and characteristics of decision support systems. realizes the intelligent production line scheduling DSS system; then this paper designs the system’s scheduling model with stochastic disturbance, system database and system fault diagnosis function, and realizes an intelligent service scheduling decision support system based on multi-agent technology. Finally, this article tests the data transmission speed and fault diagnosis function of the system. The test results show that the system is relatively fast in data transmission speed and the fault diagnosis function is also very reliable.
A Diffusion Prevention and Recovery Scheme for Spilled Oil on Land
Authors: Y L Zhang , Z L Li , W B Guo , H Peng 
Published: August 2021

Abstract
A set of quick response vehicle group and scheme was investigated to solve the current diffusion and recovery problems of spilled oil on land. A spilled oil recovery plant was simulated via FLUENT, the simulation result was verified by a control test, and it appeared that this plant could reach the recovery rate of above 50 m3/h and diffusion prevention scope of 4,000 m2. Hence, it can, to some extent, guarantee the quick response on the field, so as to reduce secondary disasters and protect the field environment.