bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of nickel-coated graphene and evaluation of infrared interference performance
Authors: Li Kai , Wang Xuanyu , Gao Yanqing , Dong Wenjie , Li Huiying 
Published: February 2022

Abstract
In this paper, reduced graphene oxide (RGO) was prepared by oxidation-reduction method, and then RGO/Ni composite was prepared by chemical plating method. The RGO and RGO/Ni samples were characterized by the methods of SEM, TEM, XPS, EDS, XRD, etc. The complex refractive index of the samples in 2~14μm infrared wavebands was measured by ellipsometry method, and the infrared absorption characteristic was calculated by DDA method. Then, the infrared interference performance was tested by the method of Fourier transform spectrometer connected with smaller smoke box, and the dispersivity was also comprehensively evaluated by Carr index method. It is found that electroless nickel plating not only can ease the secondary agglomeration between the RGO layers, improve its dispersivity, but also change the electromagnetic properties of graphene surface and significantly improve its infrared absorption. From the infrared interference performance test, it can be seen that the average extinction coefficients of RGO smoke to 3~5 μm and 8~14 μm infrared is 2.56m2/g and 1.8m2/g, respectively. While the average infrared extinction coefficients of RGO/Ni in the corresponding wavebands is 2.9m2/g and 2.55m2/g, respectively. It further indicates that the surface modification of electroless nickel plating can greatly promote the infrared interference performance of RGO. In particular, the far-infrared extinction performance has been obviously improved.
Preparation of modified rare earth lanthanum oxide/polypropylene nonwoven fabric by meltblown method
Authors: Sun Yunhan , Wang Xiaoning , Jia Qingxiu , Yang Jian 
Published: February 2022

Abstract
Lanthanum oxide was organically modified with dopamine and blended with polypropylene, and then lanthanum oxide (La2O3)/polypropylene (PP) nonwovens were prepared by melt blown method. The nonwovens were characterized by FTIR, SEM, TG, mechanical properties and X-ray shielding. The experimental results show that the addition of modified La2O3 makes the fiber arrangement of PP nonwovens more densely arranged and improves the thermal stability of PP nonwovens. The higher the amount of La2O3, the better the X-ray shielding performance of composite nonwovens.
The Effect of UV Degradation of Ketoprofen and Its Influencing Factors
Authors: Zhen Huiwen , Liu Junliang , Zhang Tiejian 
Published: February 2022

Abstract
This paper mainly studies the removal effect of ketoprofen in UV-degraded water and explores the influence of light turbidity, light intensity and other factors on the degradation efficiency of ketoprofen. The results show that deep ultraviolet treatment has a good degradation effect on ketoprofen, which accords with the pseudo-first-order kinetic equations. After irradiation with 1700 μw/cm2 UV lamps for 40 minutes, the maximum removal rate can reach 99.59%. Besides, UV lamps with different irradiation strengths (1300μw/cm2/1700μw/cm2) have similar treatment effects on ketoprofen. Low turbidity (1-5NTU) solutions will reduce the degradation rate of ketoprofen, while high turbidity (5-9NTU) solutions will enhance the degradation rate of ketoprofen. Solution turbidity is increased after UV degradation of ketoprofen.
Research on tunnel damage process based on acoustic emission technology
Authors: Zhu Huangda , Liu Feng , Cui Jiawei , Peng Wangbin 
Published: February 2022

Abstract
For a long time, it is generally believed that the tunnel has excellent seismic performance and can resist earthquake damage, so it will not be damaged. However, according to the survey of tunnels after the Wenchuan earthquake in China, 110 tunnels were damaged to varying degrees. In this paper, a series of shaking table tests were carried out on the proportional tunnel model under seismic excitation. Acoustic emission technology is combined with seismic excitation to identify and describe the damage of tunnel lining. The tunnel lining strain and acoustic emission signals are collected in the test. In addition, this paper also introduces the use of acoustic emission technology to describe the damage of tunnel lining. Taking the crown as an example, through the correlation analysis of amplitude, counts and energy, it is preliminarily judged that the crown is damaged under working conditions 7 and 8; Then combined with strain analysis, it is proved that the correlation analysis is reasonable. Finally, the rationality of correlation analysis is further explained by the changes of counts, energy, and its cumulative parameters with time. At the same time, the damage process of tunnel lining under seismic excitation is described by defining damage variables, which can be divided into three stages: initial compression elastic stage, yield failure stage and residual stage.
Research on rail crack detection technology based on magneto-optical imaging principle
Authors: Xu Chen , Xu Guili , He Junwei , Cheng Yuehua , Dong Wende , Ma Limin 
Published: February 2022

Abstract
The detection of rail top crack is of great significance in ensuring the safe operation of railway. Based on the principle of magnetic flux leakage detection and Faraday magneto-optical effect, a high-resolution and non-destructive magneto-optical imaging detection method is proposed in this paper. This paper analyses the principle of magneto-optical imaging, establishes a rail magnetic flux leakage detection experimental system based on magneto-optical effect, and detects the rail specimen with crack through experiment. The experimental results show that the change of crack width and depth will affect the magneto-optical imaging results, and the minimum crack size that can be detected by this experimental system is 0.4mm wide and 0.5mm deep. This paper realizes the detection of rail crack defects by using magneto-optical imaging method, and provides the basis for building an efficient, portable and high-resolution rail non-destructive testing equipment.
A digital microfluidic system with integrated electrochemical impedance detection arrays
Authors: Jin Kai , Huang Qi , Hu Chenxuan , Hu Siyi , Li Jinhua 
Published: February 2022

Abstract
Electrochemical sensing provides a new way for miniaturization and low cost of equipment. Meanwhile, digital microfluidic (DMF) technology is making lab-on-chip a reality. The two technologies are essential in the point-of-care area. Electrochemical detection on electrodes and DMF-based droplet driving electrode realize their respective functions by means of electrical signals. In terms of working mode, it seems to have certain similarity, and electrochemical sensing seems to be more suitable for integrating digital microfluidic systems. We thus integrated electrochemical sensing on an active matrix (AM) DMF system. As a common transparent conductive glass, indium tin oxide (ITO) has been widely used as the top plate of the digital microfluidic chip. In this work, we used ITO glass with patterned interdigital electrodes as the top plate of the AM-DMF chip. We achieved on-chip droplet volume detection by electrochemical impedance spectroscopy (EIS). We also proposed a novel sample dilution method on the DMF chip. It takes only 30 seconds to dilute solutions into 4 different concentrations. We then analyzed droplet samples of different concentrations with EIS method. And the correlation coefficient of the fitted curve is as high as 0.9964. In conclusion, EIS is a powerful detection technology for fast, high-integration and low-cost detection on DMF system. The integration of EIS and DMF can be used in various biochemical analyses in the future.
Masked Face Detection and Calibration with Deep Learning Models
Authors: Li Xingze 
Published: February 2022

Abstract
Under the COVID-19 pandemic, the demand that face detection devices should be enhanced to detect masked faces is imperative. In this study, we utilize several state-of-the-art face detection models and compare them on various unmasked and masked human face datasets. Moreover, by analyzing the results we obtain, we evaluate these disparate models and discover some problems. Attempting to overcome the problems discovered, we propose and implement several improvements, and acquire more results for analysis. At length, we propose some ideas for future research directions.
Research on Straightness Detection Device for Elevator Guide Rail
Authors: Feng Shuangchang , Liang Yanchun , Chen Jie 
Published: February 2022

Abstract
The elevator guide rail is composed of a plurality of section by section guide rails in series. The straightness of the guide rail needs to be detected when the elevator is installed. There are many detection methods in the prior art. The first is the vertical line method, but this method is too backward, low precision, time-consuming and laborious; The second is to use RSU (elevator guide rail straightness dynamic detector) for measurement. Its basic principle is to install RSU in the lift car. When the car slides up and down along the guide rail, multiple distance (displacement) sensors detect the horizontal offset of the guide rail in real time, and finally fit these horizontal offsets to analyze its straightness. The disadvantage of this method is that its accuracy will be affected by car shaking and its own error, and the improvement of measurement efficiency is limited. The purpose of this paper is to provide a straightness detection device for elevator guide rail in order to overcome the defects of the above existing technology. With low cost and high efficiency, it is worth popularizing in the inspection work.
High-temperature digital circuit design for fluxgate sensor
Authors: Zhang Chenhao , Zhang Yiming , Gao Junxia , Li ZhongZheng 
Published: February 2022

Abstract
With the continuous development of integrated electronics and the increasing demand for downhole resource exploration, it has become important to develop a small size, high temperature resistant, high-performance digital fluxgate sensor. Due to the strict size limitation of downhole exploration equipment, some high-temperature devices are generally large in size and have a different performance of the same type of devices, so it is necessary to select the devices that meet the temperature requirements through high-temperature experiments. In this paper, by simplifying the circuit structure and selecting devices through high-temperature experiments, the usability of the circuit structure at 175°C and the stable performance in long-time operation at high temperature were verified.
Research on Adaptive Transmission Protocol of TT&C of Launch Vehicle Based on TDRSS
Authors: Fan Dandan , Han Xingye , Dun Yi 
Published: February 2022

Abstract
The application of TDRSS in TT&C of launch vehicle can improve the coverage and transmission rate of TT&C link. But the transmission protocol based on fixed transmission rate can not ensure the stable TT&C link based on TDRSS. The adaptive transmission protocol proposed in this paper can adjust the transmission rate according to the real-time transmission status during the whole flight. According to the different types of rocket-borne subscriber terminals, the open loop adaptive transmission protocol and closed loop adaptive transmission protocol are designed, which can both keep the stable transmission and improve the transmission efficiency.
Study of Installation Method for Large Parts of Spacecraft Based on Zero-gravity Unloading
Authors: Zheng Lide , Song Xiaohui , Wang Wei , Zhang Qian , Xue Feng , Liu Xu , Gu Lei , Lian Huaqing 
Published: February 2022

Abstract
The zero-gravity unloading method is a process method commonly used in the spacecraft field. It has been widely used in the docking installation and ground deployment test of load equipment such as solar wing and antenna, and it is used according to the situation of solar wing, antenna or other load equipment. Different gravity unloading tooling. This article analyzes and compares various unloading methods according to the installation requirements of a certain model of large parts in the zero-gravity state. On the basis of analysis, it is concluded that the traditional five methods of uninstallation are not suitable for the installation and uninstallation of large-scale equipment modules of this model. It is necessary to carry out targeted design according to the configuration characteristics, main structure characteristics and installation requirements of large-scale equipment to realize large-scale modules. Stress-free assembly in zero-gravity state. As a result, a method for installing large parts of spacecraft based on zero-gravity unloading was proposed, which formed a large-scale component docking technology and realized the smooth assembly of the product.
SC Curreent Interruption Capability and Protection of SiC Based Solid State Circuit Breaker
Authors: Tian Mingyu , Ren Yu , Tian Shipeng , Tan Yuchen 
Published: February 2022

Abstract
This paper presents the short circuit (SC) current interruption capability of a 1.7 kV/72 A silicon carbide (SiC) MOSFET based solid state circuit breaker (SSCB). The interruption process of SSCB is introduced in detail. A test platform is built and the SSCB is tested and discussed at various DC-link voltage, fault inductance and junction temperature. Before the desaturation point (VDS=200 V), SSCB can successfully turn off the SC current. The saturation value of the SC current is positively correlated with di/dt, and the effect of junction temperature (50-150°C) on saturation current is not significant. A SC protection circuit with a response time of 260 ns is proposed and is validated through the test platform.
Security architecture and technology of power Internet of things for energy interconnection
Authors: Zhao Xuesong , Fan Xiaofei , Hou Jing 
Published: February 2022

Abstract
The power Internet of things platform is an important support for the digital innovation service of the energy Internet, covering all links of the power system. There are many new security problems. How to realize the trusted interconnection, intelligent defense and security interaction of the power Internet of things, and how to solve the data, application and key security of the power information system are important problems to be solved in the current power Internet of things, Facing the development of energy Internet, this paper analyzes the security requirements and characteristics of power Internet of things, puts forward the security framework of power Internet of things, and summarizes the key technologies of power Internet of things security.
Different parameter values of Gaussian function analysis on EMI reduction and switching loss in active gate drive of SiC MOSFET
Authors: Li Chentao , Ma Qishuang , Xu Ping 
Published: February 2022

Abstract
Nowadays, wide bandgap(WBG) devices named SiC and GaN were widely used in power electronics system to improve power density and switching speed, meanwhile, electromagnetic interference(EMI) becomes a major drawback in power electronics system based on wide bandgap devices. This article discusses the influence of different parameter values in Gaussian function on EMI suppression, and a trade-off between EMI and losses was also discussed. Experiments were given in this article to analyze different parameter values effect on EMI reduction. This article can give guidance in the Gaussian function generated when used in active gate drive to reduce EMI.
Design of magnetic coupling mechanism for wireless power transmission system based on magnetic flux analysis
Authors: Xiao Jing , Yin Liqun , Gong Wenlan , Wu Xiaorui , Ouyang Jin 
Published: February 2022

Abstract
Aiming at the wireless charging system that can dynamically change arbitrarily in a three-dimensional space such as a smart robot, this paper proposes a new type of magnetic coupling mechanism that combines a disc coil and a spiral coil. It can not only avoid frequency splitting in the short-distance range, but also effectively enhance the coupling strength in the long-distance range. In addition, it can also effectively improve the position robustness and anti-offset ability of the robot’s wireless charging system. In this paper, the geometric framework of the new magnetic coupling mechanism is first given. Based on the analysis of magnetic flux, it is theoretically confirmed that the magnetic coupling mechanism can reduce the coupling strength in the near range, avoid the frequency splitting phenomenon, and improve the coupling strength of the system and the energy efficiency of the system in the long range. Finally, based on the finite element simulation software COMSOL, it is proved that the proposed magnetic coupling mechanism can achieve high energy efficiency output in a large range, and has strong position robustness and anti-deviation.
Bearing fault diagnosis based on XWT-CEEMD noise reduction
Authors: Wei Yuqian 
Published: February 2022

Abstract
In recent years, bearing fault diagnosis has been a research hotspot. In order to improve the reliability of acoustic fault diagnosis, this paper combines Cross Wavelet Transform (XWT) and complementary ensemble empirical mode decomposition (CEEMD) to extract bearing fault features from acoustic signals. Finally, the time-domain features and spectral centroid are input into the SVM for fault classification. The results show that the proposed method can effectively improve the reliability of acoustic fault diagnosis.
Volume calculation of goaf based on 3D scanning
Authors: Zhao Hu , Zou Bofeng , Meng Xianfeng , Duan Qingming 
Published: February 2022

Abstract
The goaf formed by underground mining poses a great safety hazard to the production of the mining area. The accurate calculation of goaf volume is the data basis for the filling and blasting of the goaf, and it also has certain reference significance for the monitoring of collapse accidents. In this paper, the data detected by the 3D ranging scanner is used to build a network model on the Self - developed 3D modeling platform, and the network model is divided into the smallest triangular grid. The algorithm uses the scanner’s laser probe as the common point, accumulates all the minimum tetrahedral volumes constructed by the common point and the smallest triangular grid, and completes the accurate solution of the total volume of the scanned goaf. Experiments and practical applications show that the volumetric algorithm has high accuracy, and has universal applicability to the volume calculation of similar types of space scanning equipment.
New Energy Vehicle Battery SOC Evaluation Method based on Robust Extended Kalman Filterd
Authors: Zhang Jian , Wang Qiang , Meng Fanjie , Shi Hang , Xi Yanjun 
Published: February 2022

Abstract
In actual charging/discharging scenarios of new energy vehicles, low temperature, natural disasters, extreme weather, electromagnetic radiation and other factors will cause strong noise interference in SOC evaluation. Aiming at the problem of SOC evaluation accuracy in extreme environments, a power battery SOC evaluation method based on robust Kalman filter is proposed. The experimental results prove that the method is suitable for the accurate assessment of SOC in the charging/discharging process of the power battery of new energy vehicles under the interference of complex and harsh environment noise, and it has good robustness.
Failure causes and solutions of relay protection switching power supply
Authors: Zhang Hongyue , Liu Zhiwen , Fan Zhanfeng , Song Hongtao , Niu Zhilei , Xiong Zhangxue , Deng Maojun , Shuai Jiang , Li Wenzheng , Li Xinwen 
Published: February 2022

Abstract
Relay protection device plays a key role in the stable operation of power grid, and the failure of switching power supply is the main reason for the unstable operation of relay protection device. This paper studies the failure causes of relay protection switching power supply, and concludes that electrolytic capacitor is the key component leading to the failure of power plug-in. At the same time, the failure mechanism and life influencing factors of aluminum electrolytic capacitor are deeply studied, and the improvement measures are put forward. According to the research results of this paper, the switching power supply has the characteristics of high reliability and long life.
Research on Foldable Elevator Manual Turning Device
Authors: Feng Shuangchang , Chen Jie , Liang Yanchun , Chang Xiaoqing 
Published: February 2022

Abstract
In the elevator main engine room, turning gear is one of the indispensable safety devices. The elevator turning gear is used to drive the main engine to rotate when the elevator is closed, and then stop the car at the corresponding position for rescue. The elevator turning mainly includes a disc and a drive shaft, wherein the drive shaft is provided with a gear, which is used to cooperate with the gear on the traction wheel of the main engine to drive the elevator traction wheel to rotate. The turning gear needs to be suspended when not in use. Because the disc is perpendicular to the drive shaft, when the drive shaft is normally installed on the disc, the drive shaft is horizontal, which will affect the space in the main engine room. Of course, there is also a separate design between the drive shaft and the disc. When the drive shaft needs to be installed on the disc through tools, the installation process is more troublesome. In order to solve the above technical problems, this paper studies a foldable manual turning of elevator, which saves space and is easy to install.
Research on Non-uniform Interrupted Sampling Repeater Jamming for Phase Coded Radar
Authors: Luo Zhihao , Li Jianbing , Dong Xueyu , Sun Jianbang 
Published: February 2022

Abstract
Because of using correlation processing technology, it is difficult for traditional jamming patterns to achieve the desired jamming effect on phase coded radar. At present, the forward deception jamming of phase coded radar is mainly realized by uniform interrupted sampling repeater jamming (UISRJ). In order to solve the problem that the UISRJ can only produce a single and delayed false target, a kind of non-uniform interrupted sampling repeater jamming (NUISRJ) is proposed. The non-uniform sampling pulse train is generated through pseudo random sequence, and then sampled and forwarded to generate jamming signal, which is processed by radar pulse compression to form dense false targets. Combining the theoretical analysis and simulation results, it can be seen that the NUISRJ has the dual effects of suppressing jamming and spoofing jamming, and the distribution of false target string is more random, including the leading and lagging false target. The amplitude and coverage area of false targets group can be controlled by adjusting sampling pulse width and forwarding times to effectively implement jamming.
Research on Equalization Technology of Broadband Satellite Communication Channel
Authors: Jiang Jie , Zuo Jian , Feng Hao 
Published: February 2022

Abstract
Satellite channel is the representative non-linear channel with limited frequency band. The random change of the channel causes the communication stability to be affected. With the development of satellite communication technology, the bandwidth of satellite communication has increased and the data rate has also increased significantly, resulting in more serious code interference, which has become a key factor affecting communication quality. Finding an efficient equalization technology to eliminate channel inter-code interference is the key to ensuring satellite broadband communications. This article first briefly discusses the principle of eliminating inter-symbol interference and common equalizer algorithms, and summarizes the main factors that affect the performance of channel equalization algorithms. On this basis, an improved LSTM blind equalization algorithm is proposed.