bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of PLC in Variable Frequency Constant Pressure Control System for Mine Emulsion Pump Station
Authors: Tian Cong , Su Chang , Zhao Weiping 
Published: August 2021

Abstract
Programmable logic controller (PLC) is an automatic control device made of microcomputer technology. It is based on sequential control, supplemented by loop adaptive, can complete logical judgment, timing, memory and numerical functions. The application of PLC in the variable frequency and constant pressure control system of mine emulsion pump station is studied. The emulsion pump station for mine is introduced. Based on the practice of energy saving, safety and protection equipment, the application of variable frequency speed regulation and constant pressure technology in emulsion pump is described. The working principle and PLC control system of emulsion pump control system are introduced by means of PLC circuit control. The experimental results show that the design of variable frequency and constant pressure control system based on PLC can greatly save energy consumption. In the variable frequency state, the average temperature of the pump body does not exceed 45°, indicating that the variable frequency constant voltage control system can improve the service life of the equipment.
Key Technologies of Security Access Control in Fog Computing Environment
Authors: Bin Sun , Yongjie Wang 
Published: August 2021

Abstract
The rapid development of Internet technology has promoted the innovation of mobile communication technology. Following 2G, 3G, and 4G technology, mobile communication has entered the 5G era. At the same time, the trend of interconnection of all things is becoming more and more clear, and the simple cloud computing is gradually changing to more advanced and powerful fog computing. As a near-maturity edge computing model, fog computing is gradually popularized and applied. The security problem is always the most important thing in network technology. Therefore, it is necessary to think about the security access in fog computing environment. This work mainly discussed the security access control technology in fog computing environment, clarified its key parts, and analyzed its effective control technology from two aspects: extended access and hidden access. This work will give users more flexible access control options to thus achieve effective protection of data security and related factors.
Design and Implementation of Student Management System Based on Internet Big Data
Authors: Li Zhi 
Published: August 2021

Abstract
Due to fast development and wide popularization of information technology, the traditional teaching ideas, teaching methods, teaching processes and teaching organizations have changed, which has caused fundamental changes in teaching mode and education system. The student management system in view of Web technology is the main carrier of information administration in universities. This paper puts forward a solution to the self-management system of universities based on big data mobile internet. This system is related to self-learning, self-management, and using multiple mobile internet applications to help students use the self-management system, in order to improve students’ ardour and initiative take part in teaching activities; The learning process management and curriculum evaluation management have been established, and the teaching quality has been comprehensively considered from multiple dimensions, so that the training have a gift for universities has been effectively guaranteed.
Research on Distributed Storage Technology of Database Big Data Based on Cloud Computing
Authors: Hongwei Duan , Ligetu Bi 
Published: August 2021

Abstract
With China entering the era of big data, the storage and management of big data has become a hot issue. The proposal and use of distributed storage technology has achieved good results. The continuous development of Internet communication technology and the popularization of computer information technology promote the evolution of traditional data model. The distributed storage system for big data has strong expansibility. It can optimize the existing storage space, realize the optimal allocation of space resources, and reduce the cost of data storage. Cloud computing as a resource sharing business computing model, it receives a huge amount of data every day, and the amount of data is still expanding. This has caused great pressure on distributed storage in cloud computing environment. This paper studies the distributed storage technology of database big data based on cloud computing, in order to strengthen the data management in the era of big data and improve the security and utilization of data.
Design and Implementation of University Network Education Platform Based on Cloud Computing
Authors: Xiaomei Song 
Published: August 2021

Abstract
With the continuous progress of science and technology, the information society has also come. The emergence of cloud computing has made China’s information platform more open, and at the same time, it has given unlimited opportunities for the development of all walks of life. The traditional single teaching mode in universities is no longer suitable for the development of modern students. In the internet plus era, universities built a network teaching platform to enrich students’ learning methods. The use of the network teaching platform improved students’ learning interest and stimulated students’ learning potential. Cloud computing itself has obvious characteristics, which guarantees services under various measures. It is outstanding in scalability, virtualization and high versatility, and can be applied in different fields. People can get more educational resources through the network education platform of universities based on cloud computing, so as to make the education of universities exert greater value. Based on this, this paper mainly discusses the construction strategy of university network education platform based on cloud computing.
Construction of Electronic Educational Game Design Pattern Based on Feature Extraction Technology
Authors: Liang Zhigan 
Published: August 2021

Abstract
With the popularity of computer and Internet, online games and educational games have become very common forms of entertainment in our daily life. Especially for teenagers, all kinds of games have become an indispensable part of their extracurricular activities. The emergence of Educational Games brings entertainment and interest to students’ boring learning, which can realize the change of students from tired of learning to willing to learn. Its purpose is to stimulate learners’ interest in learning and promote learners’ autonomous learning. Whether the design of educational games matches the characteristics of learners is the key factor to determine the success of educational game design. The design of educational games must be based on the characteristics of learners. Based on the feature extraction technology, this paper analyzes the construction method of the design pattern of electronic educational games, strives to balance the educational and game nature of electronic educational games in the design program, and provides a new idea for the construction of teaching resource database.
RETRACTED: Lightweight Visualization of 3D Model Based on Cloud Computing Information System
Authors: Tang Baoyan , Liu Qianqian 
Published: August 2021

Abstract
The processing requirements of 3D model data in modern manufacturing industry and the data type characteristics of 3D model data source. With the popularity of modern cloud computing platform and the technical advantages of cloud computing platform, the 3D model information is stored in the information system, and the cloud computing technology is used to manage the information system. The purpose of this article is to combine cloud computing technology with lightweight 3D visualization technology such as acrobat 3D to realize lightweight visualization of 3D model in information system. With the advantage of cloud computing platform which does not occupy local resources and has large data processing capacity combined with lightweight 3D visualization technology such as Acrobat 3D,3D model data can be visualized in cloud fast traffic. This paper investigates and studies, compares the speed of reading information between the information system using cloud computing technology and the ordinary local storage information system, and tries to find out the advantages of cloud computing compared with the traditional information system. In addition, this paper also optimizes lightweight on the basis of 3D model data set. Reduce the collective product of its data without destroying the visualization of its basic information.
Design of real-time data analysis system for physical training based on data mining technology
Authors: Hui Deng , Jin Wang 
Published: August 2021

Abstract
In competitive sports, the most direct and effective way to improve athletes’ competitive level is to strengthen training. At present, the training mode is still mainly based on coaches’ experience and athletes’ physical conditions, and lacks scientific and effective data information as the basis for planning. In this paper, the software is developed in the core construction of recessed Linux, the VIX bus technology is take advantage of gather sports data, and the data mining technology based on collective information characteristic extraction is designed. This paper uses big data mining method to mine the information of sports evaluation, pick up the autocorrelation characteristics of data information flow of sports training real-time data analysis system, constructs the association rule feature set combined with the prior knowledge of sports evaluation, and realizes the database construction of sports training real-time data analysis system by using the association rule feature extraction and big data information fusion processing technology. The simulation results show that the accuracy of sports assess decision-making information mining using the real-time data analysis system of sports training is high, and the dependability of the system is satisfied.
Network Security Protection Technology under the Background of Computing Big Data
Authors: Chen Shanjie 
Published: August 2021

Abstract
Based on the risk analysis of the network security of the radio and television critical information infrastructure, this paper introduces the evolution process of the network security protection architecture, and proposes the network security intelligent protection architecture. The article starts from the protection content and methods of physical security, network security, border security, server security, terminal security, application security, data security and backup and recovery, security management center and other technical aspects. Construction is explored. The thesis builds a reliable and stable broadcast technology center network information security system through the establishment of a network information security technology guarantee and a network information security management system.
Smooth particle hydrodynamics simulation of dam-break impacting different obstacles
Authors: Tian Xiewei 
Published: August 2021

Abstract
Aiming at the problems of smoothed particle hydrodynamics (SPH) method boundary imposing difficulties and particles easily penetrating solid walls, an improved complex boundary processing method is proposed. First, the improved SPH method is applied to numerically simulate the dam-break flow problem, and the numerical results are compared with the experimental results to verify the effectiveness of the method; then, the flux is added to the continuity equation to improve the pressure; finally, Numerical simulation is carried out to study the flow state of the dam-break water under different conditions of impacting on different obstacles, and the obstacles are considered as columnar, columnar with holes, wedge-shaped, semi-circular, 1/4 lower right circle obstacles and 1/4 upper right circle obstacles. The results show that: the stable pressure field can be obtained by adding flux; the improved boundary treatment method can effectively prevent particles from penetrating the solid wall, which is suitable for any complex boundary; SPH method has significant advantages in dealing with strongly nonlinear extreme deformation flow problems such as dam-break.
Numerical simulation of the forming characteristics of the circumferential MEFP with integrated shell and liner
Authors: Ma Guangsong , He Guanglin , Zhang Yulong , Qiao Zenghui 
Published: August 2021

Abstract
To study the forming characteristics of the multiple explosively formed projectile (MEFP) warhead of the small-caliber grenade with the integrated design of the liner and shell, the liner thickness is less than the shell thickness as the research object, and LS-DYNA is used for numerical simulation. On this basis, the influence of the curvature radius and the center thickness of the liner on the forming results of the projectile is further studied, and the integrated design of the MEFP forming result and the separate design were compared and analyzed. The simulation results show that, when the liner thickness structure is smaller than the shell thickness, the projectile shape is better. The shape of MEFP with the integral design is better than the separate design, and the forming velocity of the integral design is slightly lower than the separate design with the curvature radius increase of the outer and inner wall. When the liner curvature radius is fixed, the shape of MEFP with the integral design is better than the separate design, and the forming velocity of MEFP with the integral design is slightly less than the separate design with the liner center thickness increase. The results show that the forming characteristics of circumferential MEFP of integrated design and separate design have a certain similarity. The shape of MEFP with the integrated design is better than that with separate design, however, the forming velocity of MEFP with the integrated design is slightly lower than that with separate design.
Research and application of SPH parallel algorithm based on particle decomposition
Authors: Wang Siqi 
Published: August 2021

Abstract
Smoothed Particle Hydrodynamics (SPH), as a typical meshless numerical method, has it advantage in modeling free surface flows. However, this method is computationally time-consuming. To resolve this problem, we propose a SPH parallel algorithm based on particle decomposition, which evenly distributes all particles to each process for calculation. In this circumstance, the functions including send, receive, and broadcast are called only once for each time step of communication, which is easy to implement and also has a good scalability. To verify the effectiveness of the proposed algorithm, we perform the numerical simulations of 2D dam-break flow and 3D droplet impact onto a liquid film. It is demonstrated that the proposed SPH parallel algorithm can significantly reduce the simulation time and has a massive advantage on 3D large-scale computation; the maximum speed-up ratio can up to 30 when the number of particles is more than million.
Study on the Influence of Printhead Intake Velocity on Pressure of Sand Mold 3D Printer
Authors: Shi Haoming , Shan Zhongde , Guo Zhi , Yan Dandan 
Published: August 2021

Abstract
To achieve the precise forming of sand mold for 3D printing, the relationship between the printhead intake and the pressure fluctuation in the printhead during startup and printing of sand mold 3D printer was studied, and the relationship between the two and the causes of pressure fluctuation is analyzed. With the help of computational fluid dynamics and Fluent software, the internal flow model at a single nozzle is established, and the ink flow under 10 groups of different inlet velocities is simulated to obtain the flow contour and pressure fluctuation values. Combined with the small-channel gas-liquid flow pattern, the relationship among the air intake velocity and the pressure fluctuation and the reasons for the pressure fluctuation are analyzed. The results show that with the increase of intake velocities, the pressure fluctuation amplitude increases. In addition, the disturbance degree of gas-liquid interface wave leads to the difference of pressure fluctuation amplitude as the gas-liquid flow pattern changing. The simulation results agree with the experiments. Therefore, according to the relationship between the intake velocity and the pressure fluctuation amplitude, the stability of the printing system can be improved by limiting the speed ratio of supply pump and return pump.
Sensitivity analysis of coiled tubing erosion wear based on FLUENT
Authors: Cao Yinping , Chen Zetian , Pan Ying , Wang Jianxing , Mi Hongxue , Dou Yihua 
Published: August 2021

Abstract
Erosion wear is the main reason for the failure of coiled tubing during hydraulic jet fracturing operations. Taking Φ 60.325mm × 4.775mm CT90 coiled tubing as the research object. Three-dimensional finite element model of coiled tubing is established. The effects of mass flow, particle flow rate, particle diameter and other sensitive factors on the erosion characteristics of coiled tubing were analyzed by FLUENT software. The research results show that: The erosion wear rate of coiled tubing shows a nonlinear increasing trend with the increase of mass flow and particle flow rate, and the increasing trend is firstly slow and then sharply. As the particle diameter increases, the maximum erosion rate of coiled tubing changes irregularly. The particle flow rate is most sensitive to the erosion of coiled tubing. The finite element method used in this article provides a reference for the evaluation of the erosion wear of coiled tubing in hydraulic fracturing operations.
Optimization of Abrasive Water Jet Nozzle Based on Numerical Simulation
Authors: Deng Jiangsheng , Yuan Yuefeng , Li Deran , Cheng Hai , Dai Cheng , Shen Jian , Xie Fei , Wang Jiasheng 
Published: August 2021

Abstract
In this paper, based on numerical simulation method, the rosin-rammler method was introduced to describe the non-uniqueness of particle diameter of abrasive water jet nozzle and the two-way coupling method was used to simulate the interaction between discrete phase and continuous phase. Through CFD simulation software, the influence of nozzle convergence angle, focus tube length on the outlet velocity of mixed-phase, and the relationship between abrasive flow rate and nozzle inner wall wear were obtained.
A wide-template and high-accuracy data transfer method for unstructured adjoint-based grid adaptation
Authors: Cui Pengcheng , Chen Jiangtao , Li Bin , Li Huan , Ma Mingsheng , Tang Jing 
Published: August 2021

Abstract
Grid adaptation is an important way to improve the identification of flow field and the accuracy of aerodynamic characteristics. Adjoint-based error estimation and grid adaptation method focuses on improving aerodynamic characteristics by optimizing local grids areas which are more sensitive to output functions. The data transfer between different meshes during the iteration of adjoint-based grid adaptation is the basis of accurate error estimation and grid adaptation. The traditional vertex-based method, however, is not suitable for cell-centred scheme finite volume method. A new wide-template and high-accuracy data transfer method for unstructured adjoint-based grid adaptation is proposed in this paper. Numerical results show that the proposed method is more accurate than traditional node-based method when transferring discontinuous flow field containing shock waves in cell-centred scheme finite volume method, and the accuracy of aerodynamic characteristics is obviously improved after grid adaptation.
Numerical Investigation of an Integrated Ejector Nozzle with the Nozzle Pressure Ratio of 2.97
Authors: Ge Changjie , Xiao Lianghua , Shang Yinhui 
Published: August 2021

Abstract
The design of the integrated ejector nozzle system directly affects the secondary mass flow rate and the trust characteristics of the aero-engine. The numerical simulation was used to study the effects of longitudinal distance between engine nozzle exit and aircraft surface and radius of ejector nozzle exit on the performance of the integrated ejector nozzle system. Results indicates:(1) As NPRs increases, secondary mass flow rate and thrust coefficient of ejector nozzle system generally increase;(2) the effect of D2/D0
is not obvious but D3/D0
has great effect, and the value of D3/D0
designed between 1.1 and 1.25, which is beneficial to the secondary mass flow rate and thrust coefficient of ejector nozzle system;(3) the combination design of D2/D0
and D3/D0
can restrain the flow separation between the primary flow and have inhibitory effect on the over-expansion of low nozzle pressure rate.
Experimental investigation on the flow-induced vibration of spatial bended section of heat exchanger tubes
Authors: Song Guangdong , Zhu Lina , Liu Mengmeng , Yu Huajin , Zhou Lijun , Gong Xiuyan 
Published: August 2021

Abstract
Flow induced vibrations in heat exchanger tubes have led to numerous accidents and economic losses in the past decades. The vibration characteristics of traditional heat tubes have been studied comprehensively through experiment, numerical simulations and theoretical analysis. Special tubes with spatial bended forms possess the great performance in nuclear engineering. The present work is motivated to understand the unclear flow-induced vibration features of these original heat exchanger tubes. An experimental system including of the tested objects are designed in water environment. The vibration responses and frequencies of spatial bended section of the heat exchanger tubes are tested and analysed. The results show that the spatial-bended tubes are safe enough to suffer the water flow within the velocity of 1m/s. The considerable vibration responses are in the bended areas with square configure, which should be specifically designed. The present work can be a guide for the special heat exchangers in nuclear engineering.
Research on wave motion response characteristics of a seaplane
Authors: Gao Xianjiao , Li Chenghua , Liu Tao , Wu Bin , Wang Mingzhen 
Published: August 2021

Abstract
As one of the criteria hydrodynamic qualities, sea-keeping performance is closely related with a seaplane’s security, comfortableness, durability. This paper is proposed to study the wave motion response characteristics of a seaplane based on wave model test. Firstly, similarity criterions, determination of test parameters, experiment equipment and data processing method are introduced. Then, based on test results, we analyse the influence of wave parameters, sliding velocity and deadweight on wave motion. It indicates that there is a positive relationship between wave height and motion response, while the acceleration decreases with the increase of wave length, and its peak value occur at the short wave length region of 0.5 to 1 times hull length of the seaplane, heave and pitch angle first increase then decrease with the change of wave length. The influence of sliding speed on heave and pitch angle depends on wave length, but the acceleration varies positive with change of velocity. The influence of heave and pitch angle has no obvious correlation with deadweight, while the acceleration shows a negative trend with change of deadweight. These regularity can be used to provide some reference for the analysis of wave motion response characteristics of seaplane.