bluuebunny/crossref_metadata_2025_split huggingface dataset:
Area fluctuations on a subinterval of Brownian excursion
Authors: Meerson Baruch 
Published: November 2020

Abstract
Area fluctuations of a Brownian excursion are described by the Airy distribution, which has found applications in different areas of physics, mathematics and computer science. Here we generalize this distribution to describe the area fluctuations on a subinterval of a Brownian excursion. In the first version of the problem (model 1) no additional conditions are imposed. In the second version (model 2) we study the distribution of the area fluctuations on a subinterval given the excursion area on the whole interval. Both versions admit convenient path-integral formulations. In model 1 we obtain an explicit expression for the Laplace transform of the area distribution on the subinterval. In both models we focus on large deviations of the area by evaluating the tails of the area distributions, sometimes taking into account pre-exponential factors. When conditioning on very large areas in model 2, we uncover two singularities in the rate function of the subinterval area fraction. They can be interpreted as dynamical phase transitions of the second and third order.
Construction of “All-faculty, Whole-process, All-around” Educational Objective System in Colleges and Universities Based on the research of Big Data
Authors: Fu Xiaochun 
Published: November 2020

Abstract
The core competency of big data is an essential objective of China’s education reform. The selection and cultivation of core competency should comply with the characteristics of the universities and college students. Based on the cultivation of moral people, the training of professional talents should be focused. Under the premise of social cultivation, the all-round development of individuals should be valued to cultivate high-quality skilled talents with “both ability, integrity, and all-round development”. The whole process coverage refers to the cycle of practical education, and all faculty engagement is the target subject. The all-round linkage is taken as the carrier of practical education to implement the “base, engineering, standardization and diversification” of the working mechanism for practical education, explore the innovation path for the effective integration of socialist core values and vocational education, and improve the comprehensive quality of college students in an all-around manner.This paper studies and analyzes the construction of the three-round goal system through big data.
Development of an intelligent energy storage device for distributed distribution area
Authors: Wan Dai , Li Gang , Zhu Guangming , Yu Bin , Qi Fei , Zhou Hengyi , Zhao Miao , Huang Yaoqi 
Published: November 2020

Abstract
In order to solve the problem of seasonal distribution transformer overload in distribution network, especially in rural power grid, an intelligent energy storage device for distributed distribution station area is developed in this paper. The device is connected in parallel to the main line of 380V low voltage line in the distribution station area. The device can compensate the power of the overload distribution transformer, and alleviate the low voltage problem at the head end of the substation area caused by 10kV line overload or distribution transformer heavy overload. This paper introduces the working principle, control strategy, software and hardware design scheme of intelligent energy storage device in distributed distribution station area. The correctness and effectiveness of the device are verified by field operation.
Improvements on the design of sand structure additive manufacturing
Authors: Qin Hao , Zhang Xiwen 
Published: November 2020

Abstract
Additive manufacturing has been widely used in the industry in recent year. Among a range of applications, printing sand structure for casting die or the structure in the construction industry has become more and more popular, since it is cost-effective by using powder printing technology without laser sintering. This paper has explored the additive manufacturing technology used for printing sand structure. To achieve cost-effective and saving materials, methods have been exploring through requirement analysis, materials selection, and design optimization in terms of the mechanical performance of the sand structure. Through 3D modelling, design optimization, and performance improvements, an optimal sand structure for 3D printing is created. This proposed method gives a general way to produce sand structure through 3D printing in the construction and casting industry.
Design of Control Software on Mining Isolation Switch Breaking Test Motor Mechanism
Authors: yukun Wang , Hong-kui Zhang , Zhi-fu Li , Hao Liu , Xin Gao , Long Ma 
Published: November 2020

Abstract
In order to improve the controllability and stability of the isolation switch breaking test for mine and to improve the intelligence level of the test and inspection device, the software program of the motor mechanism control system was developed based on PLC. Based on the analysis of the present situation of the operation mechanism of mine isolation switch breaking test, the demand of mine isolation switch breaking test control system is put forward. Based on cx-one 4.2 software and ladder diagram language, the control software program of motor mechanism is developed. The practical application shows that the software runs well and lays a foundation for the development of intelligent inspection technology.
Research Status and Development Trend of Advanced Manufacturing Technology for fuze
Authors: Guo Jingjie , Ma Shaojie , Zhang Xiangjin 
Published: November 2020

Abstract
This paper analyzes a series of problems which need to be solved for a long time in China’s fuze manufacturing industry, such as high resource consumption, poor economic benefit, low technology content, mostly in the low end of the industrial value chain, and points out that advanced manufacturing technology can promote the transformation and development of China’s fuze manufacturing industry. Based on the brief introduction of the concept, development history and key technologies of advanced manufacturing technology, this paper focuses on the application background, theoretical research and engineering progress of micro nano structure precision machining technology, intelligent additive manufacturing technology, intelligent manufacturing system and industrial internet. It is proposed that China should take “made in China 2025” as the traction, vigorously develop advanced manufacturing technology, and promote the sustainable, green and healthy development of China’s manufacturing industry.
Mechanical system design of water air amphibious variable wing UAV
Authors: Zhang Yan , Zhou Jie 
Published: November 2020

Abstract
With the rapid development of science and technology, the application of UAV is more and more extensive, but the application of UAV is only limited to a single space field. In addition, other space explorers such as vehicles, ships and submarines are also greatly limited and fail to break through the space restrictions. The market needs a UAV that can fly in a variety of environments to be applied in more realistic scenarios. In view of its limitations, the water air amphibious variable wing UAV combines the advantages of traditional UAV and submarine, and has great development prospects in the fields of marine rescue, environmental survey, biological tracking, entertainment experience and military development.
Research on aerodynamic and flow field characteristics of high speed elevator with different shaft blockage ratio
Authors: Cui Hanwen , Zhang Qing , Zhang Ruijun , Zhang Luzhong 
Published: November 2020

Abstract
With the increase of building height, more and more high-speed elevators are applied to high-rise buildings in order to improve the transportation efficiency of people in buildings. Compared with the medium and low speed elevators, the airflow in the shaft is more severe when the high-speed elevator car is running in the narrow and long shaft, and the influence of aerodynamic force and aerodynamic noise is more obvious. In order to explore the aerodynamic characteristics of the high-speed movement of the elevator car and the airflow law in the shaft, and further optimize the aerodynamic parameters of the high-speed elevator shaft system, a full-scale three-dimensional model of the shaft with different blocking ratio is established and numerically simulated. Through the analysis of the calculation results of different blockage ratio of the shaft model, it is found that the greater the blockage ratio is, the greater the resistance of the car operation is, and the airflow disturbance behind the car movement is more severe than that in the front. The calculation results provide a reference for further exploring the airflow flow law in the high-speed elevator shaft.
Analysis on Key Production Control of High Carbon Wire Rod for Automotive Bead Wire
Authors: Shuwei Cao , Xiaoqi Yang , Yawei Du , Zhanjie Chen 
Published: November 2020

Abstract
SWRH72A high carbon steel wire rod is an important raw material for producing automotive bead wire, hose steel wire and steel wire-rope. Based on design of chemical composition, reasonable adjustment and optimization of smelting and continuous casting process, reheating process, rolling process and cooling process etc., Anyang Iron And Steel StockCo., Ltd. produced successfullyΦ 5.5 mm and Φ 6.5 mm high carbon steel wire rod grade SWRH72A by its 100t Converter-High Speed Wire Rod Mill. The results showed that the chemical composition control was narrowrange, centerline segregation was low, production process of trial steel was reasonable. The wire rod was in good mechanical performance with the range of tensile strength deviation of less than 50 MPa for same heat, same nominal diameter and same rolling system, the sorbitic metallographic structure of wire rod reached more than 90%. The performance indexes met the requirements of the bead wire users.
The effect of Cd Content from Different Sources on the Surface and Bottom of the Water Column
Authors: Yang Dongfang , Li Haixia , Lin Dong , Yang Dong , Zhang Longlei 
Published: November 2020

Abstract
According to the survey data from Jiaozhou Bay water area in 1992, the vertical distribution and monthly change of Cd content in surface and bottom waters from the center to the southern bay mouth of Jiaozhou Bay are studied, and the influence of source, change process and principle of Cd content in the surface and bottom are determined. The water body in the southeastern part of Jiaozhou Bay is considered to be a circular column of water. The main sea current carrying Cd content passed through the surface of the column, while the Haibo River carrying Cd content passed by the surface. The results show that the Cd content in the main sea current transport changed from low to high in October, May and August; and the content of Haibo River transport varied from low to high in August, October and May. Moreover, the Cd content in the surface layer of southeast bay changed from low to high in May, October and August, and the content in the bottom layer varied from low to high in August, May and October. This reflects the monthly change process of Cd content in the southeast bay waters with two significant characteristics. 1) In August, the Cd content transported through the main sea current and the content in surface water in the southeast of the bay at the same time reached the highest value. 2) In August, the Cd content transported through the Haibo River and the content in bottom water body in the southeast of the bay varied to the minimum value simultaneously. Therefore, the authors put forward the principle of monthly variation of Cd content on the surface and bottom of the southeastern bay. And the model block diagrams are established to show the change process and principle of matter content deposition and migration. The principle shows that from May to October, the Cd content transported through the main sea current determined that on the water column’s surface in the southeast bay, while the Cd content transported through the Haibo River did not affect the Cd content on the water column’s surface. From May to October, Cd content in the bottom of the water column was determined by that in the Haibo River transport, while Cd content in the main sea transport had no effect on that at the bottom of the water column.
Optimization on the Johnson-Cook parameters of Ti-6Al-4V used for high speed cutting simulation
Authors: Xinjian Li , Guigen Ye , Zhimin Wang , Shifeng Xue , Yi Zhang 
Published: November 2020

Abstract
The Johnson-Cook (J-C) parameters obtained from the conventional mechanical tests are usually adopted directly for the high-speed cutting simulations. However, the conventional J-C parameters can not describe the exact plastic deformation under the coupling effect of large strain and high strain rate occurred in high speed cutting. In this paper, the response surface approximation method was used to optimize the Ti-6Al-4V’s J-C parameters for high speed cutting simulation, and the experimental results obtained from our previous work were further adopted to validate the optimized parameters. The simulated chip size error obtained at the cutting speed of 15 m/s could reduce from 16% with using the conventional J-C parameters to 8% with using the optimized J-C parameters. Furthermore, the simulated chip morphologies achieved based on the optimized J-C parameters were compared with the experimental results with cutting speed ranging from 0.05 m/s to 86.5 m/s. The results show that the simulated chip morphologies could give good agreements with the experimental results, and the chip morphology transitions can be well predicted with using the optimized J-C parameters.
Comparison of nitriding kinetics of austenitic stainless steel assisted with hollow cathode discharge in different potentials
Authors: Shenlie  , Suijianghua  , Sunpeng  , Baolin  
Published: November 2020

Abstract
In the present research 304 austenitic stainless steels were nitrided using hollow cathode discharge-assisted plasma and the effect of potential conditions on the nitriding kinetics was evaluated. The results indicate that nitriding kinetics is significantly promoted in cathode potential. CrN in the anode specimen is more difficult to form than those in the floating and cathode specimens and the temperature affects the modified layers seriously.
Design and Finite Element Analysis of Axial Low-frequency Vibration Tool-holder
Authors: Liu Zhanfeng , Liu Hui , Zhao Dezhong , Wang Chi , Wang Tianqi 
Published: November 2020

Abstract
Vibration-assisted drilling can significantly reduce the drilling force and cutting heat during deep hole machining, improve tools life and hole machining quality. As a branch of vibration drilling technology, axial low-frequency vibration-assisted drilling has a broad application prospect in the field of drilling because of its simple structure and easy implementation. A mechanical axial low-frequency vibrating tool-holder (ALVT) is designed, and the overall structure layout and working principle of the vibrating tool-holder are analyzed. The rotary motion of the machine tool spindle is used as the power input to drive the sinusoidal surface to rotate to achieve the amplitude output. The vibrating tool-holder model is simplified, and the ABAQUS finite element software is used to simulate the titanium alloy material for ordinary drilling and axial low-frequency vibration drilling (ALVD), and the axial force and cutting temperature changes are compared and analyzed. The results show that ALVD of titanium alloy can reduce the average axial force by about 47% and the cutting temperature by about 11%, which can significantly improve the drilling conditions and the quality of hole machining.
Effect of prior austenite grain size on bainitic transformation above and below Ms in medium Mn steel
Authors: Chen Shan , Zhao Xianming , Xu Wei 
Published: November 2020

Abstract
The effect of prior austenite grain (PAG) size on bainitic transformation kinetics below Ms in 0.2C-3.92Mn-1.6Si steel has been investigated using a dilatometer. The samples were austenitized at two different temperature to achieve the average PAG size of ∼10.9 μm and ∼17.3 μm. The results show that above Ms the austenite grain size plays a significant role in bainitic transformation kinetics. However, the influence of austenite grain size on bainitic transformation kinetics below Ms becomes weaker which is ascribed to the acceleration of prior martensite on bainitic transformation below Ms.
Wear Performance of Ti/Al Composite Coating Based on Magnetron Sputtering
Authors: tu Qi , Zhao Yizhou , A-akhali Adham , Cai Jiabin , He Fuqiang , Tang Zhengqiang 
Published: November 2020

Abstract
In order to study the wear performance of Ti/Al coating under different loads, split-target magnetron sputtering device was used to prepare a Ti/Al composite coating on the surface of 304 stainless steel, the friction and wear test of the coating with 3.5%NaCl treatment was carried out. Scanning electron microscope (SEM), scratching instrument, EDS, three-dimensional surface topography instrument and other equipment were used to investigate the physical and chemical properties of the coating. During magnetron sputtering coating, Ti and Al atoms are stacked to form a Ti-Al binary phase, and TiAl3 intermetallic compounds are enriched in the coating. The wear experiment shows that the wear rate of the Ti/Al coating is significantly lower than that of the substrate, moreover, the wear rate increases uniformly with the load. The friction coefficient of the Ti/Al coating is lower than the friction coefficient of substrate in the table wear stage under different loads. The friction coefficient of the coating decreases as the load increases. At low loads, the coating main form of wear is the surface abrasive wear with furrows. With increasing the load, the coating wear form is mainly represented that the reduction of abrasive wear and the generation of micro-cracks on the surface, which in turn produces scaly flaking.
Construction of Intelligent Maintenance Ontology Model for Shield Machine
Authors: Yang HouMan , Zhang Yu , Qin Hao , Ling Xiang , Wang XiaoXu 
Published: November 2020

Abstract
In order to transform the shield machine maintenance engineers’ experience and related non-structural data into digital, structured and standardized maintenance knowledge, it is necessary to construct a shield machine intelligent maintenance ontology model. This paper has proposed a systematic method for the construction of this ontology model, which mainly includes seven steps. A professional ontology modeling tool protégé is used to complete the construction of the ontology model, and its own reasoning mechanism is applied to maintain the consistency of the ontology logical relationship. Moreover, a graph database by Neo4j is created to store the constructed shield machine intelligent maintenance ontology and related data for the shield machine its intelligent maintenance, ontology model construction technology can also migrate to the field of material synthesis.
Research on Automatic Control Mode of Profile Cutting Machine Based on PLC
Authors: Weiting Huang , Zaosheng Zhong 
Published: November 2020

Abstract
Aiming at the constant need of cutting various metal profiles in industry, the control mode of automatic profile cutting machine is studied, which is based on PLC (Programmable Logic Controller) controller. MCGS (Monitor and Control Generated System) is used for monitoring and management, and the modular design of control layer is completed. The core of the control layer is that we have a cutting material database, which makes up for the fact that the current cutting machine control system only aims at a single cutting model or material, and the cutting speed and torque of the cutting machine need to be adjusted or designed manually. Based on this market demand, the automatic control mode of profile cutting machine based on PLC is established. Practice shows that this mode is based on the analysis and comparison of common cutting materials in the market, and the material database is consequently established. Users can choose the required cutting mode through the intuitive MCGS graphical interface, which improves the cutting efficiency of users and reduces the development cost of enterprises.
Research on Lightweight Method of MBD Model for Additive Manufacturing
Authors: Wang XiaoXu , Qin Hao , Liu Zhi , Zhang Yu 
Published: November 2020

Abstract
In order to solve the problems of difficult storage and slow transmission of large data in remote transmission of 3D model for additive manufacturing, a lightweight method on MBD model is proposed. A lossless compression algorithm is applied and improved in this paper to simplified the product data model and minimize data exchange file. At the same time, a detailed geometric information model is retained to realize the rapid transmission of lightweight model, which provides a convenient method for remote transmission and acquisition of 3D model in additive manufacturing process. A case study on the MBD model of a packaging machine has verified is taken as an example to verify the feasibility of the method.
Fracture Retro Estimation of Friction Plate Made of 30CrMnSiA in Laboratory Condition
Authors: Hu Zheng , Gao Xingyu , Zhang Wanhao , Zhang Weifang , Liu Xuerong 
Published: November 2020

Abstract
Fatigue life and fatigue stress range of the friction plate which is made of 30CrMnSiA were studied under laboratory environment. By using Scanning Electron Microscopy (SEM) to observe the fracture striation, the width of the fatigue striation can be obtained. Fatigue life and fatigue stress range can be studied with the combination of Paris law and fatigue striation width. The method is simple and mature, and the relative error of estimation is within expected values.
Lightweight design of truck frame
Authors: Luo Wei , Zheng Zhongcai , Liu Fengliang , Han Dongyue , Zhang Yifan 
Published: November 2020

Abstract
Trucks are an important branch of the automotive field, and their market demand has been and will maintain a stable level for a long time. In this paper, a truck with a load capacity of 6t is selected as the research object. The frame of the truck is a side beam frame, which is riveted by two longitudinal beams and eight cross beams. The solid model of the truck frame is established by three-dimensional modeling software, and then the finite element software is used for static analysis of the frame, and the maximum deformation, the position of the maximum deformation, and the maximum Stress, maximum stress point. The analysis results show that the structural strength of the frame is far greater than the load-bearing strength, which meets the requirements of use, and there is a large space for lightening the structural materials. The structural optimization design of the frame is carried out, and the weight of the optimized frame is reduced by 8.4% under the premise of ensuring the strength requirements. The maximum stress under the full-load bending condition is reduced from 207.3MPa to 177.86MPa, achieving the lightweight goal.
Analysis and Improvement of Warpage Cause of High Strength Steel in Commercial Vehicle
Authors: Shuwei Cao , Quan Chen , Liqing Yang 
Published: November 2020

Abstract
Aiming at the warping problem in high strength steel of commercial vehicle, it is concluded that the flatting machine is the main factor leading to the warpage of the strip through the plate shape tracking experiment, the reason for the deterioration of the warpage with the increase of yield strength is expounded. Analysis points out that the difference of the friction coefficient between the upper and lower rollers and the difference of the roller diameter will result in the deterioration of the plasticity after leveling. According to the high strength characteristic of the automobile steel, the measures for improving the original plate shape, reducing flat rolling pressure and the diameter difference of the work roller are developed, good application results have been obtained.