bluuebunny/crossref_metadata_2025_split huggingface dataset:
Model and dynamic performance analysis of mountain tractor suspension implements
Authors: Yang Hongtu , Xia Changgao , Han Jiangyi , Chen Chen , Zhang Hongdang 
Published: July 2020

Abstract
A tractor three degree of freedom of agricultural implement suspension mechanism is proposed. The position and posture of the agricultural suspension implement frames are controlled by adjusting these three active motion pairs. Since the agricultural suspension implement is fixed on the mountain tractor through three points, the adjustment of the agricultural implement position and posture is obtained. Corresponding dynamic performance analysis of the mountain tractor suspension implements is analyzed. This model can be used for the operation of the tractor and farm implement set with automatic chassis levelling on the slope. The farm implement and the slope terrain can be profiled by adjusting the position and posture of the farm implement, and the lateral uniformity of the cultivation depth can be improved.
A study on natural rubber composites reinforced by carbon fiber
Authors: Zhang Qiong , Li Yi , Zhu Pengxiao , Yuan Song 
Published: July 2020

Abstract
The carbon fiber was used to reinforce the natural rubber. The mechanical property, thermal property, morphology and thermal conducting property of the rubber composites were researched. The carbon fiber is dispersed well in the rubber matrix according to the scanning electron microscope images. The strength increased with the increase of the carbon fiber content and the strength reached the maximum value 20.9MPa when the content of carbon fiber is 2%. The addition of carbon fiber improves the aging resistance of rubber and maintain the property of rubber matrix. The addition of carbon fiber can improve the decomposition temperature effectively and enhance the heat-conducting property.
Analysis and control of ventilation noise reduction for box-type transformer in urban area
Authors: Wu Fayuan , Chen Yaqiong , Liu Xiaolei , Tang Jinhui 
Published: July 2020

Abstract
Noise generated by outdoor box transformer in the working process has a certain impact on the production and life of the surrounding residents. Combining with the current situation of box transformer in 10kV urban area of a residential district, the paper analyses the problems and causes of noise transmission and control. According to the characteristics of noise sources and transmission ways of substation, the paper puts forward and implements ventilation, heat dissipation and sound insulation cover to reduce noise, improve room temperature and ventilation effect, and compares and compares them. The effect of noise control before and after modification is analyzed. The result shows that the effect of modification is obvious and the noise at boundary of box transformer meets the national standard.
Research on magnetic field size and coil parameters based on non-contact magnetic induction detection of corroded rebars in infrastructure
Authors: Xiong Jingsong , Chen Chuan , Ye Huarui , Gan Pengfei 
Published: July 2020

Abstract
Non-contact magnetic induction detection is widely used in infrastructure testing due to its advantages. How to choose the appropriate magnetic field and the corresponding coil parameters is very important for electromagnetic detection. Excessive magnetic field causes excessive coil power consumption, which leads to serious heating and affects the service life of the equipment; however, if the magnetic field is too small, the detection accuracy will be reduced due to the attenuation of the magnetic field. This paper first analyzes the principle of magnetic induction detection, then the simulation analysis is carried out based on the buried depth and type of rebar commonly used in infrastructure to choose the appropriate magnetic field size.
Troubleshooting and Fault Analysis of Initial Built-In Test Interruption of Civil Aircraft Primary Flight Control System
Authors: Liu Wenwen 
Published: July 2020

Abstract
Currently, there are no flight control alarms or CMS fault information triggered when initial Built-In Test is interrupted for primary flight control system, in fact, only “TEST ABORTED” displayed for the “TEST STATUS” on the CMS, which brings some difficulties to the Built-In Test interruption troubleshooting. A Built-In Test interrupt troubleshooting methodology is proposed in this paper based on fault tree analysis.
Analysis on the cause of crack in connection pipeline of subcritical boiler reheater
Authors: Zhang Yanfei , Yun Feng , Fang Wenxuan , Wang Haixue 
Published: July 2020

Abstract
Several coal-fired thermal power boilers with the same sub-critical parameters in Mengxi area of Inner Mongolia have successively suffered from cracking and leakage failure events of reheater connecting pipes, most of which occur at chamfered back tool grooves on the inner wall grooves of pipe welding joints. In order to find out the cause of cracking, typical failure samples were intercepted for macro-morphology, microscopy, SEM, chemical composition, mechanical properties, wall thickness measurement analysis and design and operation data investigation of several boiler equipment. The results show that comprehensive factors such as deviation of burning coal type from design of boiler, automatic dispatching of AGC load in power grid, low nitrogen combustion modification and so on cause changes in boiler combustion conditions and operation, which results in excessive high input level of reheater cooling water, resulting in long-term alternating thermal stress and non-periodic vibration of straight pipe and elbow arranged after fine-tuning of refrigerant flow direction in reheater. Finally, thermal fatigue cracks are induced to initiate and propagate through the stress concentration area of the chamfered knife groove of the inner wall of pipe welded joints.
Design and Engineering Test of Soil Filling Pile with Spiral Cone Foundation
Authors: Fang Ming , Fang Guangxiu , Zhao Shifan , Liu Shoujin 
Published: July 2020

Abstract
In this paper, through the comparative analysis of two different types of pile foundations, long auger bored cast-with-pressure concrete pile and Soil filling pile with spiral cone at the same engineering project and the same geological conditions in Western Liaoning Province, it is concluded that the soil filling pile with spiral cone compare with the long auger bored cast-with-pressure concrete pile, have obvious technical advantages in construction period and guarantee, reduce the construction expenditure. Moreover, the pile integrity testing is good, and has achieved good economic and social benefits. It is a new type of energy-saving and emission-reducing pile foundation with wide application prospects.
Application of Instrumental in the Identification of Solid Waste Characteristic of Imported recycled ABS Plastic
Authors: Luo Chuan , Wang Hao , Wang Qian , Liu Zhihong , Yuan Lifeng , Zhang Chao , Lin Zhenxing 
Published: July 2020

Abstract
The content of carbon, hydrogen and nitrogen in imported recycled ABS plastics was determined by Instrumental, and the content of three monomer units (acrylonitrile, butadiene and styrene) in ABS was calculated. The influence of sample quantity and combustion time was discussed. The precision of carbon, hydrogen and nitrogen was 0.08% - 1. 32%, and the content of three monomer units was 0.08% - 1.32%. The precision of the method was 0.72% - 8.22%, and the recovery rate of the method was 90.7% - 114.8%. The precision and recovery rate of the method are good. It can quickly determine the content of each monomer unit in ABS plastics, and provide technical support for the property identification of related imported plastic solid waste.
Research Background and Mechanism of Soil Filling Pile with Spiral Cone Technology
Authors: Fang Ming , Fang Guangxiu , Zhao Shifan , Liu Shoujin 
Published: July 2020

Abstract
This paper introduces the research background of soil filling pile with spiral cone technology. It is a new type of energy-saving and emission-reducing construction pile foundation design and construction technology. The foundation pile is a kind of soil filling pile with spiral cone which has the technical advantages of rotating extrusion cast-in-situ pile and bidirectional short spiral extrusion soil pile. At the same time, the mechanism is expounded. The soil compaction of the bit and the secondary diameter-retaining drill pipe is sufficient, the penetrating force is strong, and the geological conditions are widely adapted. The effect of the rock and soil around the pile on the pile is fully improved, thus the bearing capacity of the pile is increased and the construction cost is reduced. When calculating the vertical ultimate bearing capacity of a single pile, the value of the correction factor for the increase of the same rock and soil layer around the pile increases gradually from the soil displacement screw pile, rotating extrusion cast-in-situ pile and soil filling pile with spiral cone, and the vertical ultimate bearing capacity of the three piles increases sequentially.
Design of Beidou timing module
Authors: Sun Quanyu 
Published: July 2020

Abstract
The Beidou timing module receives the Beidou Satellite Information, calculates the time and positioning information, transmits the time and timing information through various external interfaces, and has the function of short message forwarding. This paper presents a system design scheme for the Beidou time-keeping module, which uses adaptive filter switching technology to achieve accurate and stable time-keeping results, by automatically switching synchronous clock source (Beidou, IRIG-B (DC), internal high-stability crystal Oscillator) to complete time service, Beidou module with seamless switching, short-circuit protection, fault detection and diagnosis, health management and other functions.
Experimental and Automatic Measurement System Design of Flatness of Automatic Wallboard Cutting Surface
Authors: Zhao Honghua , Han Qifei , Zhao Jian , Lin Yifei , Gong Xuyin , Hu Zhitong 
Published: July 2020

Abstract
With the development of the industrialization of buildings, the demand for wallboard is increasing. The development of wallboard automatic production lines can solve the problems of low efficiency and low automation in the production process of wallboard. In the paper, the insufficient of the method that wall panel length detection in JGT169-2016 is considered, the automatic measurement system and cutting surface flatness analysis experiment is designed. Using MATLAB to filter and fit data. Optimize the cutting speed of wallboard based on LJQB-JX-600-QGJ.01 cutting machine. Through experimental analysis, better control parameters are selected for production control, and the quality of production wallboard is further improved, thereby improving the quality of the production line.
Application of Fusion sample preparation X Ray Fluorescence Spectrometry in the Identification of Solid Waste Characteristic of Imported Coated Fibre Cloth
Authors: Luo Chuan , Wang Qian , Liu Zhihong , Wang Hao , Chen Tieshan , Lin Zhenxing 
Published: July 2020

Abstract
The composition of imported coated fibre cloth was quickly identified by fusion sample preparation X-ray fluorescence spectrometry. Na2O, MgO, Al2O3, SiO2, P2O5, SO3, K2O, CaO, TiO2, Cr2O3, MnO, Fe2O3, NiO, CuO, ZnO, As2O3, SrO, ZrO, CdO, BaO, PbO in the matrix of the coated fibre cloth were determined. In this paper, the technology of direct melting of flake sample is studied. The method of pre-oxidation is that the sample piece is obliquely placed on the inner wall of crucible to increase the air circulation space and remove the organic matter and halide in a short time. The 66.5:33.5 mixed flux was used as the flux, and LiBr was used as the release agent. The temperature was about 1050 °C, and the time was about 17 min. The problem of melting of inorganic fibre and flux melt was found and solved. The calibration curve is constructed by silicate rock, bauxite, cement and other reference materials and high-purity reagents. The matrix effect correction adopts the variable theoretical α influence coefficient method, and B2O3 represents the unmeasured components as the elimination item. The maximum Al2O3, SiO2, CaO curves of this method are 84.4%, 91.5%, 62.6%, respectively. The Cr, Ni, Cu, As, Cd, Pb curve range of harmful elements is greater than 0.005%-0.33%; 21 curves have good linearity. R2 divided by BaO equals 0.997 and the rest are greater than 0.9993; the detection limit of harmful elements is less than 15 mg·g−1; precision relative standard deviation (n=11) principal component is less than 0.5%, and trace component is less than 15%; after comparison of standard substances and standard methods, the results are consistent. Accuracy of methods is good, and it can quickly identify the content of the main elements of the coated fibre cloth and provide a strong support for the subsequent identification of solid waste characteristic.
Study on fatigue crack growth rate of 15CrMo steel based on stress ratio and corrosion environment
Authors: Wang Jing , Guo Chong , Huang Kuichao , Shao Xiaolin 
Published: July 2020

Abstract
In this paper, the fatigue crack growth rate of 15CrMo steel, a typical gas cylinder material, is studied under the condition of simulating the actual working condition of gas cylinder. The low-frequency corrosion fatigue tests with stress ratio of 0.1 and 0.5 are carried out in air and different concentrations of wet hydrogen sulfide environment. The relationships between da/dN and ΔK are expressed by Paris equation. The results show that the crack growth rate in hydrogen sulfide environment with concentration of 200 ppm is 27 times higher that in air. The addition of corrosion environment greatly fasts the crack growth rate of 15CrMo steel. With the increase of H2S concentration, the crack growth rate increases exponentially. With the increase of stress ratio, the average stress increases, the crack closure effect decreases, the crack tip is fully opened, and the contact area with corrosion medium increases, which results in the increase of crack growth rate.
Asphalt Pavement Stress Intensity Analysis under Fluctuating Load
Authors: Gao Jianhong 
Published: July 2020

Abstract
The finite element software ANSYS is used to build the asphalt pavement three-dimensional model and to carry through transient analysis. The stress intensity time-history curves of asphalt pavement under the fluctuating load are obtained. The curves reveal that the pavement structure stress intensity effect of dynamic load is complex. And the point stress intensity always reaches its peak value when the load reaches this point. After the load leaves, it decreases rapidly to zero. Pavement surface is most significantly affected by load. The deeper the pavement surface is, the smaller the impact is, but the influence law remains unchanged. These conclusions can provide reference for stress intensity condition of asphalt pavement under fluctuating load.
Synthesis and Photophysical Properties of Bromination the Small-Molecule Acceptor for Organic Solar Cells
Authors: Jiang Zhao , Mao Wei-Wen , Wang Jin-Liang 
Published: July 2020

AbstractAt present, the modification of the benzene ring based terminal group IC is widely studied and a series of progress has been made. Our work designed and synthesized a new brominated fused ring small molecule receptorFBDTEH-2Brby introducing bromine atoms into terminal group. On the one hand, the electron-withdrawing effect of bromine enhances the push-pull electron effect between the core electron-donating segment and the end-capping group, making the absorption spectrum ofFBDTEH-2Brmore suitable. It shows broad absorption in the range of 600–800 nm in solution, the maximum absorption peak ofFBDTEH-2Brin solution is 742nm, While for the thin film, the absorption extended broader with an obvious red-shift in the range of 800–900 nm, it is beneficial to higher JSC. The maximum absorption peak is 800nm in the film, which can be explained by it’s nearly planar structure and the good intermolecular π-π stacking in the solid state caused by the dibromide IC. On the other hand, the introduction of Br atoms will also enhance the intermolecular interactions and improve the electron mobility. The optical band gap ofFBDTEH-2Bris 1.43 eV. These results demonstrated that due to the bromine atom has a larger size, the end groups of adjacent molecules still exhibit strong interactions with short π-π distance Because of the O···S and Br···S interactions, which is beneficial for the charge to transport along multidirections. Therefore, the introduction of bromine atoms into theterminal group to design and synthesize new brominated small molecule acceptors is expected to obtain better performance in organic solar cell materials.
General Situation of Solid Lubricant Coatings
Authors: Qin Ke , Feng Qing , Li Haoming , Zou Shuai , Dou Mingyuan , Huang Fuchuan 
Published: July 2020

Abstract
Lubricant is one of the important supporting materials in modern industry and national defense industry. The purpose of using lubricant is to reduce friction and wear, reduce or avoid material damage. Lubricating oil and grease are traditional lubricating materials, but they have their own application limitations. Solid lubricating materials, especially their lubricating coating, can meet high temperature, high pressure, high vacuum and other harsh conditions, and they are more and more widely used in various industries. Based on a large number of literatures at home and abroad, the properties, application characteristics and preparation technology of solid lubricant coating are reviewed, and the research trend of solid lubricant coating is prospected.
Fracture failure analysis of coal mill shaft
Authors: Lyu Lei , Zhang Tao , Sun Zengwei , Sun Yunfei 
Published: July 2020

Abstract
During the operation of No.2 boiler in a power plant, the fracture of a coal mill shaft occurred. The fracture causes of the coal mill shaft were found by macroscopic inspection, metallographic inspection, chemical composition analysis, fracture morphology analysis and mechanical property inspection. The experimental results showed that: 1. The external surface of the coal mill shaft had been welded, and the poor welding process resulted in a large number of welding defects such as cracks, slag inclusions and lack of fusion in the overlaying layer; 2. The improper hot working process of the coal mill shaft resulted in the abnormal metallographic structure of the shaft, and the existence of serious reticulated ferrite and brittle widmanstatten structure resulted in the low strength of the shaft. 3.Because of the existence of the cyclic torsion and bending stress of large load, the initial crack source occurred at the welding position of the hardfacing layer, and then extended in the form of fatigue, eventually causing the coal mill shaft to break. Three factors led the high cycle and low stress fatigue fracture of the coal mill shaft.
Field experimental study on the dynamic response of CRTS-I ballastless track subgrade of the Shanghai-Nanjing intercity high-speed railway during operation period
Authors: Liu Ting , Pei Yanfei , Su Qian 
Published: July 2020

Abstract
Shanghai-Nanjing intercity high-speed railway, the busiest high-speed rail in China, built with the highest standards, the longest mileages, and the fastest speed among the world. Having been in operation for 5 years, it is important to figure out the performance and rules of dynamic characteristics evolution of the substructure. To study the vibration characteristics of the ballastless track subgrade after a few years of operation, in-situ train-induced tests were carried out in Shanghai-Nanjing intercity railway representative subgrade sections. The value of vertical vibration acceleration, displacement and velocity of different measuring points in both end and center of track slab under the train load is acquired, and distribution regularities of dynamic response for ballastless track subgrade on the period of operation are summarized. The results show that: At the end of track slab, the vibration acceleration value in each layer of the ballastless track subgrade structure decays dramatically in the vertical direction, which appears an exponential trend; while in the center, the vibration acceleration value decays gently in vertical direction, which appears a roughly linear trend. On the position of subgrade surface and road shoulder, vibration acceleration values are closer in both end and center of track slab; The special parts of the end of track slab mainly have an amplification effect on vibration response of the track slab and concrete roadbed, and the train’s speed is considered to have the most notable amplification effect on the vibration acceleration of the end of track slab. The vibration displacements of the track slab and the concrete roadbed show a linear relationship with the variation of the train’s velocity, while this trend is not remarkable on the position of subgrade surface and road shoulder, which is in accordance with the dynamic displacement distribution measured among inner part of the subgrade of high speed railways such as Beijing-Tianjin, Wuhan-Guangzhou, Zhengzhou-Xi’an.
Influence of Girder Spacing on Vortex-Induced Vibration Performance and Flow Field Characteristics of Double-Layer Box Girder
Authors: Huo Wuxing , Gong Ming , Tang Xiao , Zhang Yao 
Published: July 2020

Abstract
Through wind tunnel tests and computational fluid dynamics (CFD), the vortex vibration performance and flow field characteristics of double-layer box girder with different girder spacings were studied. The results showed that the double-layer box girder has vortex-induced vibration phenomena at 0 ° and positive wind angle of attack. Among them, at 0 ° wind angle of attack, the double-layer box girder’s vortex performance gradually became better with increasing girder spacing. Under the wind attack angles of +3° and +5°, the vertical bending vortex vibration performance of the double-layer box girder showed a trend of first optimizing and then worsening with the increase of the girder spacing, and the torsional vortex vibration performance of the double-layer box girder showed a tendency to deteriorate first and then improve with the increase of the girder spacing. The development of vortices caused by the enhancement of the flow separation between the upper surface of the upper girder and the lower surface of the lower girder caused by the aerodynamic interference between the upper and lower girders of the double-layer box girder, and the magnifying effect of the upper girder on the vortex in the wake area of the upper surface of the lower girder were the internal reasons for the influence of the girder spacing on the vortex vibration performance of the double-layer box girder.
Welding Deformation of Unequal Thickness Tailor Welded Blanks under Multiple Factors
Authors: Meng Dawei , Zhang Liping , Li Yan , Zhang Guizhi 
Published: July 2020

Abstract
With the popularity of lightweight requirements, the application of tailor welded blanks with unequal thickness is increasing gradually. The welding deformation of tailor welded blanks with unequal thickness inclined weld is affected by the external constraints and the internal structural parameters of the plates. In this paper, the effect of the external constraints and the internal structural parameters on the multi-layer and multi-pass welding deformation of unequal thickness inclined weld was investigated. The deformation distribution law of butt welding of unequal thickness inclined weld was obtained combined with simulation and experiment results. The results showed that the spring constraint method was similar to the actual welding condition, meanwhile, the control effect of spring constraint on the welding deformation was better. The welding gap had the greatest influence on the welding deformation, followed by the angle of inclined weld, thickness of thick plate and thickness of thin plate. When the thickness difference between two plates was kept at 50%, the control effect of welding deformation was the best.