bluuebunny/crossref_metadata_2025_split huggingface dataset:
Increasing wear resistance of austenitic stainless steel by anodic plasma electrolytic nitrocarburising
Authors: Mukhacheva T L , Belkin P N , Burov S V , Dyakov I G , Silkin S A , Kusmanov S A 
Published: May 2021

Abstract
The effect of plasma electrolytic nitrocarburising on the wear resistance of 12Cr18Ni10Ti steel was investigated. The phase composition of the modified layer and the surface morphology were studied using X-ray analysis and scanning electron microscope. The wear of the specimens was determined with dry friction of the lateral surface of a cylindrical specimen against a bearing steel disc (60 HRC). It is shown that anodic PEN/C of steel samples results in the formation of a hardened layer with a microhardness up to 370 HV due to its saturation with nitrogen and carbon followed by quenching. The wear resistance of steel enhances by 8.5 times after treatment in a solution of carbamide (12 wt. %) and ammonium chloride (10 wt. %) at 800 °C for 5 min with quenching in an electrolyte.
Specificity of carbon diffusion during plasma electrolytic treatment of steel
Authors: Shadrin S Yu , Kusmanov S A , Kovrizhnykh T A , Belkin P N 
Published: May 2021

Abstract
This work is devoted to evaluation of the diffusion coefficient of carbon using the thickness of the martensitic layer after plasma electrolytic carburising in various electrolytes followed by quenching. The effective diffusion coefficients of carbon in the structure of mild steel containing oxide and martensitic layers are determined. The maximum diffusion coefficient at a carburising temperature of 900 °C is 23.6. 10−8 cm2/s for treatment in an acetone-based electrolyte for 1 min. The obtained values were comparable with the calculation results for the thickness of the pearlite layer after anodic plasma electrolytic carburising as well as data of measurements of the distribution of carbon concentration in the carburised layer after cathodic saturation. The influence of the oxide layer inhibiting the diffusion of carbon and the possibility of controlling its thickness by varying the concentration of ammonium chloride, which provides anodic dissolution of steel, were confirmed.
Simulation of sputtering a sandwich target in a reactive gas medium
Authors: Smirnov V V 
Published: May 2021

Abstract
A model of reactive sputtering of a sandwich target in nitrogen is considered. The target temperature is determined as a function of the ion current density. For the mathematical description of the process, the basic postulate of chemical kinetics is used, taking into account the Langmuir isotherm equation and the Arrhenius equation under non-isothermal conditions. In addition, thermionic emission and evaporation of the target surface are taken into account in the model.
Research on Improving Strategy of Technology Innovation Capability of Equipment Manufacturing Industry in Liaoning Province
Authors: Fan Xiaonan , Liu Yang , Dai Minghua 
Published: May 2021

Abstract
With the development of the economy and the advancement of technology, major enterprises are also under heavy competitive pressure while welcoming huge opportunities for development. With the improvement of the global value chain system, all industries have realized the importance of improving technological innovation capabilities. As a traditional industrial province in our country, Liaoning Province has made some progress in technological innovation in the equipment manufacturing industry, but still has the problem of weak technological innovation capabilities. This paper takes the equipment manufacturing industry in Liaoning Province as the research object. This paper summarizes and analyzes the development status and technological innovation status of the equipment manufacturing industry in Liaoning Province. The author uses the entropy method to evaluate the technological innovation capability of the equipment manufacturing industry in Liaoning Province, and compares and analyzes it from the vertical and horizontal directions. At the same time, using the means of empirical analysis, with the help of Eviews software, a multiple linear regression model was constructed to study the factors affecting the technological innovation capability of Liaoning’s equipment manufacturing industry. Finally, combined with the empirical research results, the countermeasures and suggestions for improving the technological innovation capability of Liaoning’s equipment manufacturing industry are put forward.
Machining errors control method for near-net-shape jet engine blade CNC machining process
Authors: Wu Dongbo , Wang Hui , Yu Jie 
Published: May 2021

Abstract
This study proposes a method based on on-machine measurement to control the machining error in the blade CNC machining process. Firstly, the mechanism of machining error formation of the near-net-shaped jet engine blade are analyzed, and the composition of the machining error source and its impact are qualitatively analyzed. Secondly, the adaptive CNC machining process are introduced. Thirdly, the influence of adaptive CNC machining process on the final machining errors is analyzed. The results show that the adaptive CNC machining process is of the excellent ability of machining errors control, and this method is effective in machining error control.
An smart toilet integrated performance detection device combined with machine vision
Authors: Feng Panpan , Chen Zhuo Liang , Chen Tianyu , Xu Hua 
Published: May 2021

Abstract
The traditional smart toilet comprehensive detection device proves unsatisfying on integration, intelligence, time and effort cost, and precision. In order to improve the detection accuracy and efficiency of smart toilets test, and overcome the poor integration of equipment and low intelligence, image processing technology is applied to the comprehensive performance detection equipment for smart toilets in this paper. Lenovo all-in-one computer is used as the upper computer to realize the collection and analysis of key data. Siemens PLC, as a lower-level computer, controls multiple temperature water tanks, frequency converters and pipeline valves, and collects and transmits data on temperature and cleaning power. Meanwhile, CCD camera is innovatively introduced to locate the seat temperature test points on the smart toilet. The test results show that the detection accuracy, efficiency and integration of the device are improved obviously.
Study of the External Inverting Process of the Mild Steel Thin-walled Tube
Authors: Zheng Yuqing , Yang Minghao , An Yuanyuan , Hu Yan , Wang Fangni 
Published: May 2021

Abstract
The invertube is an ideal energy absorber to improve the crashworthiness of the vehicle skeleton body structure, but the low cost mild steel thin-walled tube often suffers some serious tearing phenomena in the external inverting process on the forming die. In order to investigate the interference factors of external inverting deformation, the optimum parameter of die structure design and the axial resistance force level of thin-walled tube in the external inverting process, a nonlinear finite element explicit dynamic codes were adapted to simulate the plastic inverting process of a mild steel thin-walled tube. The tube has the outer diameter of 60mm and the wall thickness of 2.0mm. The external inverting processes were conducted upon two kinds of round corner dies. Based on the results of previous theoretical analysis, the radius range of the corresponding die were obtained by theoretical calculation. The two die section forms and a series of dies with different round corner radii were also designed to build finite element simulation models. The inverting simulation results show that the optimal induced radii of the dies are within the range of 10.5-11.0mm. Meanwhile, it can be seen that the mild steel thin-walled tube has good formability in the early stage, which is convenient for the subsequent fine shaping of the invertube end. Moreover, the die bears less axial extrusion force, which is conducive to the improvement of the working life of the die. In the last, an ideal alloy steel die with the optimal rounded radius of 10.7mm was manufactured and used to verify the feasibility to finish the invertube manufacturing using mild steel thin-walled tubes. It provides a good simulation technology reference for the die structure design to realize the external inverting of the mild steel thin-walled tube.
Construction Practice of Centralized Maintenance Mode for Asphalt Pavement of Expressway
Authors: Wang Hongxiang 
Published: May 2021

Abstract
At present, one of the most prominent problems in Jiangsu Expressway Maintenance Project is the contradiction between maintenance operation and traffic. Based on the centralized maintenance project of Guangjing Xicheng Expressway in Jiangsu Province, this paper analyzes and summarizes the centralized maintenance mode from two aspects: the preparation points and the control in the construction process. The practice of this project shows that the centralized maintenance project needs to focus on the characteristics of multi-dimensional concentration of time, space and material, make targeted preparation from the aspects of organization, human, machine, material, technology and emergency plan, and ensure multi-directional control through summary and improvement, multi-party coordination, dynamic control, construction standardization and a series of measures in the implementation process. Compared with the traditional maintenance mode, the centralized maintenance mode makes the maintenance project better in quality, faster in progress, more controllable in safety and better in benefit. The research results provide important practical experience for similar projects.
Cause and analysis of hydraulic pump failure
Authors: Shang Li , Wang Na 
Published: May 2021

Abstract
After a period of use, the internal parts of the hydraulic pump will be worn one after another, resulting in the reduction of the movement efficiency of the hydraulic pump and various problems. Usually, this is a sign of damage to the hydraulic pump. If the hydraulic pump is seriously damaged and beyond the scope of repairable technology, it should be replaced in time and repaired effectively. If it is difficult to repair, replace the parts if necessary to improve the working efficiency of the hydraulic pump. Under certain circumstances, experienced maintenance personnel can fully improve the working efficiency of hydraulic pump through precise maintenance and effective matching.
Research on microstructure and hardness of AISI1050 disk based on FDM and FEM methods during quenching process
Authors: Zhang Yishuai , Fu Jia , Sun Hongxing , Liu Hua 
Published: May 2021

Abstract
Microstructures of AISI1050 disk during quenching were simulated by DEFORM-HT, and corresponding parameters of mechanical properties were investigated by applying the algorithm of finite difference method (FDM). Above all, thermo-physical parameters and diagrams of CCT curve were calculated by JMATPRO. Besides, the simulation of multi-phase microstructure considering initial thermo-physical parameters was realized by DEFORM-HT. The volume fraction of single phase were obtained by the FDM method, and then a weight function considering carbon equivalent of phases was introduced to predict the final hardness of multi-phase and according to the quenched microstructure and independent single phase hardness simulated. Temperature field, stress field and microstructure change of an AISI1050 disk under different quenching processes were studied by using the DEFORM-HT software numerical simulation calculation, combined with the continuous cooling transition curve ( CCT curve) of AISI1050 steel. The martensite transformation of the disk tread during the quenching process can increase the wear resistance. According to the actual working conditions combined with the CCT curve of AISI1050 steel, the hardness of the disk rim surface is 54.8 HRC, which can meet the requirements of 51-56 HRC. It is concluded that the maximum equivalent stress of the disk( the equivalent stress after unloading is the residual stress) is distributed near the disk inner layer in the inside of the plate to hand over the location. The microstructure of the specimen is observed and compared with the simulation results, which prove that the simulation results are reliable. The simulated hardness by using both JMATPRO and DEFORM-HT can provide some basis to predict the hardness on certain degree.
Mechanical behaviors and its main influence parameters of flexible assembly joint of timber column and reinforcement concrete beam
Authors: Wu Zhongtie , Fan Pingping 
Published: May 2021

Abstract
Flexible assembly joint is the key problem to coordinate the deformation of hybrid structure. This study aims to investigate the mechanical behaviors and its main influence parameters of flexible assembly joint of timber column and reinforced concrete beam. Finite element models were established and analyzed. The mechanical behaviors of the flexible assembly joint were discussed including the horizontal bearing capacity, horizontal stiffness and load-displacement hysteretic loops. The influence of the vertical load and rubber performance property on the mechanical behaviors of flexible assembly joint was analyzed. The results indicate that the relationship curve of horizontal load and displacement is the bilinear form before its failure. The vertical load and rubber performance property have great influence on its mechanical behaviors including the horizontal bearing capacity, horizontal stiffness and load-displacement hysteretic loops, which are regarded as important indexes to do the performance design.
Research on the Application of UAV Tilt Photography Technology in Engineering Project
Authors: Wu Bei , Li Bingnan , Li Shanshan , Li Hongjie , Zhou Rui 
Published: May 2021

Abstract
Based on the teaching building project, the three-dimensional model generated by the fusion of tilt photography data processing process and panoramic image is applied to compare the three-dimensional model in the construction network plan with the real three-dimensional model. By using the advantages of fast modeling of tilt photography, the 3D real scene under 360 degree panorama is combined with different construction stages, and the models of different stages are visualized to realize the real preview of the project, so as to improve the quality of project construction, solve the problems in the construction process, and ensure the smooth progress of construction.
Research on deep foundation pit excavation based on numerical simulation
Authors: Cao Shiyong , Song Shuai , Xili Qi 
Published: May 2021

Abstract
The safety of deep foundation pit excavation has always been an important topic of urban construction safety. The traditional method is to control the construction safety by monitoring and adjusting the construction process, but the timeliness of monitoring makes it limited in the control of construction safety. In this paper, MIDAS / GTS software is used to simulate the excavation process of a hospital foundation pit in Guiyang. The maximum horizontal displacement in X direction is 4.03mm, and the minimum is -4.78mm. The maximum horizontal displacement in Y direction is 4.41mm, and the minimum horizontal displacement is - 4.9mm. Through the study of the common horizontal X and Y displacement nephogram of crown beam, waist beam and anchor, the synergistic effect can be well expressed. The maximum horizontal displacement in X direction is 5.56mm. The minimum horizontal displacement is - 3.54mm. The maximum horizontal displacement in Y direction is 6.56mm. The minimum horizontal displacement is - 4.45mm. By comparing the numerical simulation results with the field measurement results, the reliability of the numerical simulation in the evaluation of the foundation pit is fully proved.
Study on the Effect of Silane-silica Sol Hybrid Material on the Properties of Cement-based Materials
Authors: Li Li 
Published: May 2021

Abstract
This article analyzes the preparation of cement-based materials and the preparation of silane-silica sol hybrid materials. The author studied the effects of materials on the water permeability, gas permeability, ion permeability, freeze-thaw resistance, material mechanism and other properties of cement-based materials. The purpose of this article is to improve the performance stability of cement-based materials and extend the service life of cement-based materials.
Welding procedure research of R04200 niobium plates
Authors: Jiang Chengjun , Meng Jin , Zhang xiaoli , Xue Xiaolong 
Published: May 2021

Abstract
The weldability of R04200 niobium plates is analyzed. The mechanical property, bending property and corrosion resistance are tested by the butt welding procedure of GTAW. Test results show that butt joints by the welding procedure perform good property, and the corrosion resistance microstructure of the welding joint is normal. The success of the procedure qualification test is of great help to the standard formulation of the niobium pressure vessels.
Basic Principles of Microwave Communication
Authors: Mao Ziyu 
Published: May 2021

Abstract
Microwave is a form of electromagnetic radiation with one meter to the one-millimeter range. It has the excellent capacity to carry a lot of information and is a good choice to deal with data crisis. It can be used in many fields, and the development of microwave technology is being studied extensively. Microwaves can be used in scientific research, and the structure of the internal substances can be analyzed according to the different degrees of microwave absorption by different substances. Also, the microwave physiotherapy instrument created by microwave technology can kill some diseased cells and play a therapeutic role. This thesis will discuss and introduce some basic knowledge and equipment of transmission line theory, waveguide theory and microwave chemistry, to have a basic understanding of microwave technology. The results show that microwaves should have optical characteristics, skin effects, and other properties. Antennas, radars, transmission lines, and remote sensing measurement applications are all related to these characteristics
Research on Torque Control Distribution between Motor and Engine in P2.5 Hybrid Vehicle
Authors: Jing Junchao , Liu Yiqiang , Wujie  , Wang Yongjian , Huang Weishan 
Published: May 2021

Abstract
The normal torque distribution of the P2.5 hybrid system is based on the strategy of open-loop engine control, dynamic engine torque estimation and the motor torque compensation. To meet the rapid acceleration and the deceleration, the motor torque is compensated according to the estimated engine torque to satisfy the driver torque request first, and then satisfy the battery charge torque. Other torque distribution strategies are defined according to the special working conditions below:1) To improve the efficiency of the engine and the response of the system and to avoid the drop of engine speed, the motor compensation enabled condition and torque distribution strategy is defined.2) To enhance the performance of fuel consumption and emission during the catalyst heat phase, the catalyst heat phase is divided into two phases and the torque distribution strategy is defined. 3) To decrease the battery heat time and extend the battery health life, the battery heat enabled condition and torque distribution are defined. The vehicle results are conducted and show that the normal torque distribution control can meet the acceleration and deceleration goal and drivability performance. The motor compensation can meet the driver torque by the motor and avoid the drop of the engine speed. The control of the catalyst heat phase can do good to the emission and fuel consumption.
Research on Phone Shell Detection Based on Machine Vision
Authors: Cai Li , Li Jingchuan 
Published: May 2021

Abstract
With the continuous development of computer technology, machine vision technology has the incomparable advantages of manual detection, such as non-contact, non-fatigue, so it is widely used in the field of industrial detection. The traditional method of mobile phone shell detection does not meet the increasingly intelligent demand. It is of practical significance to use machine vision technology to realize mobile phone shell detection. Combined the technology of image processing technology, this paper proposes a kind of mobile phone shell detection based on machine vision method. First of all, the original image is preprocessed, and then a method combining median filter and wavelet tool is used to eliminate image noise. On this basis, image segmentation and edge extraction are carried out. The improved Canny operator is used to detect the edge of the image, which has good effect in eliminating the false edge and ensuring the integrity and continuity of the edge. Meanwhile, mathematical morphology is used to extract the characteristic parameters of the target, and the effectiveness of the detection method is verified by simulation in Matlab.
Fast calibration method of alignment prism based on image transformation relation
Authors: Li Yihao , Zhang Weimin , Zhang Zhijing 
Published: May 2021

Abstract
The alignment assembly based on the principle of coaxial imaging has high accuracy, and the accuracy of coaxial imaging is the key to it. Manually calibrating the pose of the prism to ensure the accuracy of coaxial imaging, which has disadvantages such as difficult operation and long time consuming. This paper analyzes the image relation between the upper and lower parts of the prism based on the optical imaging theory, and solves the image transformation relation between the target part and the assembly part with an experimental method, and proposes a rapid calibration method for the alignment prism based on the image transformation relation. The tedious steps of manually adjusting the prism are eliminated. The experimental results show that this method realizes the high-precision assembly of parts by the micro-assembly system.
Experimental Study on Noise Reduction Characteristics of Slanting Serrated Trailing Edge Blades
Authors: Li Guoping , Ma Zhenlai , Chen Changsheng , Zhang Yi , Wang Qiang , Chen Eryun 
Published: May 2021

Abstract
In order to suppress the narrowband tone noise generated by the blunt part at the root of non-flat plate serrated trailing edge, a novel slanting root serrated trailing edge is adopted on NACA65019 blade. The experimental investigation on the aeroacoustic characteristics of the blade with slanting serrated trailing edge is carried out in the full anechoic wind tunnel laboratory. Reynolds number (Re) based on the chord is 2 × 105 and attack angle is 0° to 12° in the experiment. The result of experiment shows that the blade with traditional serrated trailing edge will reduce noise in high frequency range at small angle of attack, but it will produce narrow band peaks at specific frequencies, leading to an increase in overall noise level. The blade with slanting serrated trailing edge can maintain the noise reduction effect in broadband frequency range, while significantly weakening narrow band peaks. At the large attack angle, the narrow-band peaks of the traditional blunt trailing edge disappear and the noise reduction effect is obvious, while the novel slanting serrated trailing edge has more obvious noise reduction effect. The results of this paper can pro-vide a new idea for the bionic design configuration of blades.
Simulation Analysis of Cab Mounting System of Flat-head Truck
Authors: Li Panqi , Wang Yinwei , Cheng Weitao 
Published: May 2021

Abstract
Because the working environment of heavy truck with flat head is harsh, it is often in full load or vibration and impact load for a long time, and the cab suspension system receives these responses, and the driver’s intuitive feeling is the output response of the system. In this paper, the static and dynamic characteristics of air spring are tested, and the stiffness and motion characteristic curves are obtained. Then, according to the test data, the model of cab air mount system is established in ADAMS software, which simulates the response of cab mount under real vibration and evaluates its vibration reduction performance.