bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discrete Element Simulation of Brittle Porous Material Failure
Authors: Wang Zhu , Zheng Yuxuan , Zhou Fenghua 
Published: April 2021

Abstract
The study uses Particle Flow Code (PFC) 2D discrete element software to reproduce the dynamic compressive experiment of foam concrete, a typical brittle porous material, and to calibrate micro-parameters of hardened cement mortar, building a discrete element model of foam concrete. Experimental phenomena and inner mechanisms are further analyzed and studied, leading to conclusions in the deformation characterization, failure mode and failure mechanism of foam concrete specimens under different strain rate loading. The research results indicate that under low strain rate loading, the specimen cracks from inside evenly; the processes from failure to compaction is endoenergetic, resulting in stress plateau phenomenon and even deformation during the experiment. Under high strain rate loading, cracks are generated in an explosive manner at the impacted end, and the specimen on the whole is not damaged evenly. Simulation results basically fit the experiment data. The peak stress curve fitting of concrete foam from under quasi-static conditions to high strain rate is studied, which shows obvious strain rate effect that grows exponentially. By calculating models with different densities, it is found that the compressive strength of foam concrete increases along with the growth of density. Thus, PFC can be used in numerical simulation of dynamic mechanical properties of brittle porous materials.
Research on the Surface Performance of Copper after Siliconizing Treatment
Authors: Li Xiaojing , Yang Dongbiao , Xu Min , Yang Lihui , Gao Yongliang , Li Qingxiao 
Published: April 2021

Abstract
In order to improve the surface properties and extend service life of pure copper. Siliconizing of copper was carried out by penetrating silica powder. Three new phase were formed in layer, they are Cu0.83Si0.17, Cu9Si, and Cu6.69Si, respectively. The highest micro hardness of the layer reaches up to 340HV0.05, which is 5 times higher than the substrate. The corrosion resistance and oxidation resistance of copper after siliconizing in different solution were studied, such as, the corrosion resistance have improved 2.3 times in H2SO4 solution, 3.8 times in NaCl, and 4.4 times in artificial seawater separately. The oxidation resistance of the siliconized copper is 18 times than that of pure copper. The above experimental results show that, the siliconizing layer will improve the performance of pure copper dramatically.
Review on Quantum Communication and Quantum Computation
Authors: Chen Jiajun 
Published: April 2021

Abstract
Quantum communication has made great breakthroughs in recent years. Because of its characteristics for strict information security transmission and high speed, it has received attention from related research fields around the world. This paper briefly reviews the progress in the field of quantum computing and communication. The basic functions of quantum mechanics related to the quantum communication are first introduced, including qubit, logic gates, postulates, polarization and quantum entanglement. Then the applications of quantum communication are discussed including teleportation, cryptography and quantum networks. Finally, advantages and disadvantages for the current applications are analyzed and the challenges remained in the current research are demonstrated.
A Feature Extraction Algorithm Based on Structural Light in Sea-air Imaging
Authors: Jian Bijian , Ling Yongfa , Pen Ting , Mai Changli 
Published: April 2021

Abstract
The distortion phenomena in sea-air imaging mainly include geometric distortion, color deviation and low contrast. In order to obtain the target information accurately, it is of great significance to study the distortion image correction. More feature information can be obtained by using grid structured light. However, the random fluctuation of water surface and the complexity of underwater imaging environment, the traditional corner detection algorithm can not effectively obtain the correct corner information. In this paper, a fast corner detection algorithm based on minimum kernel value (MRSFAST) is proposed. The experimental results show that compared with the traditional detection algorithm, the algorithm can extract the feature point information of the image in real time, which is of great significance to further realize the distortion image correction.
An Easy-to-Array Respiration Sensor Based on Coupled Static Current Field
Authors: Zeng Minghui , Ren Xi , Liu Changlin 
Published: April 2021

Abstract
Respiration detection is an important detection method in the diagnosis and treatment of diseases in the future. A sensor device with respiratory dynamic characteristics sensing and chemical composition sensing will provide more information for respiration analysis. In this paper, a gas sensor based on a coupled electrostatic field and flow field is proposed. The sensor uses flow field drift and electrostatic field polarization and migration to achieve selectively separation and detection of charged droplets. This sensing principle ensures that the device has a faster recovery time than a device based on the adsorption, and is more suitable for the needs of respiration detection.
Research on Grid High Voltage Harmonic Detection Based on Ubiquitous Power Wireless Network
Authors: Guo Yun , Xu Minhu , Zhang Jian , Yang Li , Shen Yubo , Zhou Hongyi 
Published: April 2021

Abstract
The intelligent optimized operation of the power grid depends on the ubiquitous perception of the system and complete and correct data support, which is also the most basic requirement that the ubiquitous power Internet of Things perception layer must meet. In the application of ubiquitous power Internet of Things, obtaining complete and correct measurement data is the basis for managing power quality problems. However, in the entire link of the actual grid collection and transmission, data defects will inevitably occur. Based on the background of the ubiquitous power Internet of Things wireless network, the paper adopts the idea of modular programming and divides it into three modules: frequency measurement sampling, waveform display and harmonic display according to the performance indicators of the harmonic analyser. It can measure the frequency of the input AC voltage, perform AC synchronous sampling of the input voltage according to the measured frequency, and display the waveform of the input voltage; and then calculate the harmonics of each order through the FFT algorithm. The simulation found that the proposed control strategy significantly improved the harmonic current content than the traditional d-q positive and negative sequence decoupling control.
Analysis on Lightning Strike Breaking Defects of 500kV Yangdong Line II Optical Cable
Authors: Yang RunHua , Shu XinJian , Wu LiJie , Quan YiZhan , Liu HuiFang 
Published: April 2021

Abstract
The 500kV Yangdong Line II starts at Shanxi Yangcheng Power Plant and ends at Shandong Dongming Switch Station. It was completed and put into operation in May 2000, with a total length of 246.465 km. In this paper, through the field investigation and weather operation statistics, as well as the metal micro-analysis of the broken strand OPGW sample, it is concluded that the root cause of the broken strand is that the continuous current discharge process of the lightning channel can keep the arc root for a long time, which may cause ablation on the surface and even the inside of the single stranded wire. This paper also put forward measures to prevent such failures.
Research on driving current prediction method based on ARIMA
Authors: Zhou Yuan , Wei Guofu , Liu Yingnan , Zhang Guoxin 
Published: April 2021

Abstract
The abnormal driving current of DC measuring device is sometimes covered by the fluctuation of normal monitoring signal, which is difficult to identify by traditional operation and maintenance monitoring panel and abnormal alarm means. In order to solve the above problems, a prediction and trend analysis algorithm model of ARIMA is proposed to predict the change trend of driving current, realize the prediction of driving current in the next 8 hours, and analyze whether there is a growth trend of driving current by using the change rate. The practicability of the proposed method is verified by the analysis of the actual operation monitoring data of converter station, which can be applied to the trend analysis of driving current in DC measurement system.
Study on the Microstructure of Ni60 Coatings by Electromagnetic Field Assisted Laser Cladding
Authors: Liu Sitong , Ban Chunyan , Zhang Junwei , Li Hongwei 
Published: April 2021

Abstract
In this paper, Ni60 coatings were prepared on pure iron by electromagnetic compound field assisted laser cladding. The effect of the electromagnetic field on the microstructure of the coating was studied by changing the intensity of the electromagnetic field, the microstructure and phase composition of the coating were investigated by optical microscope (OM) and X-ray diffraction (XRD). The results showed that after applying the electromagnetic field, there were the flower-shaped structures and acicular constituents in the coating, and the grains at the top and middle of the coating were refined slightly. The number of flower-shaped structures and acicular constituents was the largest when the parameter of electromagnetic field was 1500A+0.2T, and a large area of fine grained region was found in the coating. In addition, the electromagnetic compound field could stir the molten pool and effectively reduce the porosity. The application of electromagnetic compound field did not change the phase composition of the coating, and the phase compositions of the coatings were still γ-Ni, CrB, Cr23C6 and Ni2B.
Cooperative Jamming of Multi UAVs to Netted Radar
Authors: Gao Zhi , Sun Hao , Li Fei , Guo Sai , Wang Jianming , Fang Lei , Zhao Chaohui 
Published: April 2021

Abstract
This paper analyzes the cooperative jamming problem of multi UAVs to netted radar, controls the given constraints, adopts the optimal control algorithm to analyze the movement law of UAVs in layers. Based on the single UAV track model, the cooperative jamming track model of multiple UAVs is established, and the optimal UAV track number and the number of false target tracks are calculated, The movement law of UAV track and false target track is analyzed. Firstly, according to the range deception principle of cooperative jamming of UAV to netted radar, the kinematics model of single UAV is established, and the motion parameters of false target point and UAV are obtained; on the basis of single UAV, the motion model of multiple UAVs Cooperative jamming netted radar is established, and the motion parameters of false target point and UAV are also determined. Since multiple UAVs need to meet the “homology test” of Netted Radars, it is necessary to select the optimal control algorithm to optimize the control of multiple UAVs to obtain the optimized UAV and false target track, so as to achieve the purpose of cooperative jamming. Then, according to the optimal trajectory of UAV, the change of speed is determined, and the number of UAVs is determined by selecting the number of time points of UAV moving in a straight line with uniform speed by optimizing the value of speed. In this paper, by layering the tracks of potential false targets, several reasonable tracks which are most likely to exist are selected, and then the tracks and motion laws of the other two UAVs are determined by the linear equation between these track points and the other two radars which determine the track points, flight altitude and flight speed.
Visual analysis of electrical signals
Authors: Fan Shengting 
Published: April 2021

Abstract
The sinusoidal spectrum of electrical signals is analyzed by using The Fourier series method and the Fast Fourier change method. Amplitude-frequency characteristic diagram and phase-frequency characteristic diagram are obtained respectively. The amplitude-frequency characteristic and the phase-frequency characteristic are superimposed in time domain and compared with the original signal. The analysis uses fast Fourier transform to analyze the minimum sampling frequency of electrical signals. The GUI module in MATLAB is used for programming, which makes the experimental parameters easy to modify. A more general conclusion can be drawn. Through experiments, we find that when the sampling frequency is more than twice the cut-off frequency of the original periodic signal, the fast Fourier transform method can better restore the original signal. When the sampling frequency is small, the signal will be seriously distorted. The amplitude-frequency and phase-frequency characteristics obtained by Fourier series can better restore the original signal when the harmonic frequency is large, but it is different from the original signal to some extent.
Optimization design of electric field potential for high-speed EMU high voltage box
Authors: Zhao Ming 
Published: April 2021

Abstract
Establish the three-dimensional model of high-voltage box and its internal main electrical equipment of EMU. Under the lightning overvoltage condition, through modeling and analyzing the electric field potential distribution of high-voltage components of EMU, understand the insulation weak links of high-voltage components, optimize the insulation gap of high-voltage components, local structure of components and system layout, and systematically master the layout design of high-voltage equipment of EMU method. The research results show that under the lightning overvoltage condition, the areas with higher electric field strength are mainly concentrated in the inlet port of the cable and the outlet port of the circuit breaker, the maximum electric field intensity is concentrated near the electrode of the electromagnetic voltage transformer, and the maximum field strength in the high voltage box is 21.5kv/cm, which meets the air breakdown standard, has certain safety margin and meets the insulation requirements.
Optimizing Research on Solar Cell Semiconductor Materials in Optoelectronic Materials and Devices
Authors: Ma Dinghan 
Published: April 2021

Abstract
Organic solar cells are considered to be a promising new generation of optoelectronic devices. Electrode materials are one of the most important parts of organic solar cells and have a direct impact on battery performance. The research of organic electronics is mainly concentrated in the field of organic semiconductors, and the research and development of related materials and devices have made rapid progress, including organic light-emitting diode display technology, organic thin film transistors, organic solar cells, organic memories, organic sensors, organic lasers, etc. A large number of research results have been obtained in the research of related organic semiconductor materials and devices. The paper analyses some common solar semiconductor battery materials, and prospects the application of the above-mentioned materials in solar cells in the future.
Research on the Bearing capacity of aircraft metal skin with pit damage
Authors: Zhao Luchun , Zhao Zhiqin 
Published: April 2021

Abstract
Pit is a kind of damage form that often occurs in the daily operation process of aircraft. It is formed by permanent plastic deformation due to the impact of foreign objects. In addition to the stress concentration caused by structural geometric changes, it will also produce local residual stress in the interior. Its impact on fatigue cannot be evaluated only through the stress concentration analysis of structural geometric changes. In this paper, the bearing capacity of the damaged metal skin dent is studied. By establishing the finite element model, the stress of the intact structure and the dent with different width depth ratio is compared and analysed.
Numerical simulation of mechanical properties of recycled concrete based on characterization of interfacial transition zone characteristics
Authors: Zhang Yichao , Lin Xuelian , Zhou Jinghai , Sun Hong , Ding Zhaoyang 
Published: April 2021

Abstract
Recycled concrete is the recycling of concrete waste materials. Making full use of recycled concrete can effectively reduce the consumption of natural energy and protect the environment. The interface transition zone of recycled concrete is complex and changeable, which leads to the instability of mechanical properties of recycled concrete. This paper summarizes the numerical simulation of recycled concrete and its interface transition zone, analyses the existing problems, and prospects the future development trend.
Research and Application of Spacecraft Pipeline Digital Development Mode Based on MBD Technology
Authors: Gao XiuHui , Jiang Hao , Zhang He 
Published: April 2021

Abstract
With the increasingly complex types, functions and structures of spacecraft, the requirements for the quality and cycle of spacecraft pipeline design are becoming higher and higher. By summarizing and analyzing the shortcomings of the traditional development mode of relying on drawings and documents as the carrier, and fully combining with the advanced technology of Model-Based Definition (MBD), the digital development mode of spacecraft pipeline based on MBD technology is proposed. Through the built-in pipeline design rules, the construction of standard parts database and CNC elbow, etc., and relying on the Virtual Product Management (VPM) management platform, with a set of pipeline digital model as the information carrier, runs through the design, process and welding work, shorten the spacecraft pipeline development cycle, improves the design quality, and significantly improves the quality control level.
Assessment of Grasp Ability for An End-effecter with Fin-ray Structure
Authors: Bu Lingxin , Hu Guangrui , Chen Jun 
Published: April 2021

Abstract
In this article, a flexible three-finger end-effector based on fin ray effect (FRE) was performed to evaluate the ability to resist dynamic loads during apple picking. A finite element method (FEM) simulation was performed to predict the FRE gripper’s tensile force using Abaqus software. The results of response surface analysis (RSM) showed the significant effects of TPU stiffness, grasp distance and fruit size on the vertical tension of the end-effector. Moreover, there is a good correlation between the test results and the regression model. The findings in the present study provide a reference for the application of the FRE gripper in fruit harvesting.
Structural Design and Thermodynamic Analysis of a Missile Borne RF Module
Authors: Li Jia , Jiang Shouli , Leng Tongtong 
Published: April 2021

Abstract
The volume, weight and heat dissipation resources of missile borne SAR seeker are seriously limited, and the working environment is extremely harsh. Therefore, more stringent requirements are put forward on the structural design and thermal design of the electronic module on the missile borne SAR seeker. In this paper, the modular structure design and passive thermal control of a missile borne RF module are studied. In order to improve the interchangeability of products and simplify the design, a universal RF module based on JVPX connector is designed in this paper. In view of the high-speed and high-temperature physical working environment of the SAR seeker, the structure of phase-change heat sink is adopted in the module, which solves the thermal control problem of short-term reliable operation of the heating chip on the module. Finally, the effectiveness of the passive heat dissipation is verified by simulation analysis.
Research on the application of technology of replacing bridge Bearings without interrupting traffic
Authors: Qiao Guodong , Gao Xin , Ren Kan , Tao Jiangjiang 
Published: April 2021

Abstract
This article determines the bridge jacking plan and proposes a construction organization design without interruption of traffic, based on the research of bearing disease and cause analysis, bearing technical condition evaluation, jacking plan, traffic control, safety technical plan, quality acceptance and other related technologies. According to the evaluation result of the bearing technical condition, an implementation plan for replacing the support without interruption is established, whose rationality and necessity are verified by the support project.
A kind of new “dust-free” rice thresher
Authors: Li Jiacheng , Cui Yue , Han Wenyu 
Published: April 2021

Abstract
The project was designed based on air curtain dust control of novel small rice threshing apparatus, mainly involves dust reduction in the working process of agricultural machinery, specifically belongs to the field of agricultural machinery emission reduction. The apparatus is designed feeding modules, threshing modules, dust module, the control module total four modules, means by using a vertical multi-feeding port semi-feeding type of structure, in the while maintaining efficiency reduction rolling straw produced powder dust and realizes dust removal from the source. By adopting the air curtain dust control technology, the dust produced is restrained within the specified range at the first time of diffusion, and further dust control is realized.
A Design of Intelligent Wardrobe Imitating Labyrinth
Authors: Zhang Wenze , Chen Yijing , Xu Feilong 
Published: April 2021

Abstract
This paper presents a new type of intelligent wardrobe based on the application of family daily life. Through the innovation of mechanism combination and electronic control, the device realizes the imitation labyrinth design of the wardrobe, and realizes the user’s intelligent access to clothes. The upper cabinet lattice is lowered to a position suitable for users to access clothes through a series of movable pulley structure in coordination with the horizontal movement of the lower cabinet lattice, so as to make rational use of the high space. The addition of intelligent electronic control module makes it easier for users to get the clothes they want. The device has excellent performance, simple operation process, low cost in space and economy, wide target audience and good market prospect.
Design and Analysis of A Novel Handcuffs with Two Locks
Authors: Zhang Jie , Gong Xianhong 
Published: April 2021

Abstract
The locking mechanism of raditional handcuff ring is simple with lower reliability. A noval handcuffs was designed. Besides the traditional ratchet locking structure, a magnetic locking structure was added to ensure the security. The appearence and structure of the novel handcuffs were designed and validated with FEM analysis. Meanwhile, the handcuffs were smoothly contoured.
Effect of grain size refinement on microstructure and mechanical properties of AZ31 magnesium alloy
Authors: Wang Xin , Li Mingda , Ma Songyuan , Zang Ji , Li Dongping 
Published: April 2021

Abstract
In this paper, microstructure and mechanical properties of ultra-grain size and coarse-grain size bulk AZ31 magnesium alloy were evaluated using tensile testing. The ultra-grain size (200nm) bulk AZ31 magnesium alloy showed well mechanical properties with stronger tensile strength (315MPa), typical ductile fracture surface and deep dimples, which can be attributed to grain size refinement of bulk AZ31 magnesium alloy.