bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of millimeter wave radar amplification module
Authors: Wang Cao , Chen Chuan , Fang Yong 
Published: March 2021

Abstract
In this paper, the millimeter wave radar amplification device is designed using the MWG303 power amplifier chip of Milliway Electronic Technology Co., Ltd. The whole device comprises an input waveguide microstrip transition structure based on Rogers 5880 and an output waveguide microstrip transition structure based on quartz. And waveguide structures such as waveguide turn and waveguide lift, in this design, the waveguide microstrip transition circuit is designed and simulated in the 3D electromagnetic field simulation software HFSS of Ansoft Company, and then the parts are combined, and the micro-assembly test is carried out after CAD processing. The results show that the gain can reaches more than 10dB. The design has the advantages of high gain, good flatness, practical structure and so on.
Linearity analysis of a hemispherical resonator gyro (HRG) based on force-rebalance mode
Authors: Jia You , Jiao Wen , Lihuang Xu , Min Zhu , Tianfu He 
Published: March 2021

Abstract
Linearity is one of the most important static indexes of hemispherical resonator gyro (HRG). Linearity directly affects the measurement error of the HRG in the full range, thus determining the effective range of the HRG. Through finite element analysis of the linearity of the HRG under force-rebalance mode, we can provide a theoretical basis for compensating the linearity by circuit or software, improving the linearity of the gyro combination and increasing the maximum effective range of the gyro combination.
Track non-contact detection method based on pulsed eddy current array and line structured light
Authors: Shang Chunxu , Guo Yan , Chen Zehao , You Haonan 
Published: March 2021

Abstract
Non-destructive testing methods are used to monitor the rails in operation to ensure the safety of train operation. Compared with traditional manual testing methods, non-destructive testing technology has higher detection efficiency and detection accuracy, and can also reduce the manual operation cost of railway detection. Based on the above advantages, this article combines two modules of linear structured light and pulsed eddy current array. Linear structured light can detect rail surface defects, pulsed eddy current array can detect defects inside and deep within the rail, defect information can be obtained through image processing, and the location of the defect can be accurately located by GPS locator, thereby improving the efficiency and Accuracy, and to ensure the safety of the rail. Railway transportation enables railway maintenance personnel to find and replace damaged rails in time.
Fault tolerant control of fixed wing uav based on adaptive method
Authors: Chen Jie , Lin Jianxin 
Published: March 2021

Abstract
with the rapid development of fixed-wing uav technology, the requirements for precision and fault tolerance are getting higher and higher. However, the control methods commonly used at present have shown the shortcomings in accuracy and fault tolerance. Especially when there is unknown interference in the controlled object, the commonly used control method such as PID control is far from the desired effect, and the adaptive control just can make up for this shortcoming. Adaptive control can automatically adjust the controller parameters or control laws in the control system according to the output of the system.
The main content of this chapter is to design an adaptive law to directly estimate controller parameters in the case of partial actuator failure and certain disturbance, so as to construct an adaptive closed-loop system controller, which can compensate actuator failure failure and offset system disturbance, and ensure the asymptotic stability of the closed-loop system.
Research on Dehazing Algorithm of Single UAV Reconnaissance Image under Different Landforms Based on Retinex
Authors: Zhao Linhong , Zhang Shun , Zuo Xianzhang 
Published: March 2021

Abstract
Aiming at the weakness of the dark channel prior modelin and Retinex algorithm such as slow calculation speed, halo effect, and loss of details in the processing of UAV single image dehazingand, an improved Retinex algorithm is proposed. First, convert the RGB color space to the HIS color space, separate the brightness I, assign values to the three scales of large, medium and small, use Gaussian surround to obtain the three scale brightness images and then weight, and then switch the brightness image to the RGB color space, in order to achieve the information with more details. Finally, the haze images which is distinguished in three different landforms such as city, mountainous area and forestwill be performed simulation experiments in MATLAB, and adjust the image restoration effect by changing the parameters.
Analysis of Stability and Vibration Transmission Law of Type A Metro Vehicles
Authors: Feng Zunwei , Xiao Haijian 
Published: March 2021

Abstract
In this paper, a dynamics test is carried out on the 120km/h type A metro vehicle, and the vibration characteristics of the car body, the bogie frame, the motor and the gearbox are respectively monitored at different speed levels of the motor car and trailer. Vibration acceleration sampling was conducted according to GB/T 5599-2019 to obtain the vehicle body’s stability index and analyze the vehicle body’s vibration characteristics. According to UIC518-2005, the root mean square (RMS) value of the frame lateral acceleration is used as an index to analyze the vibration characteristics of the frame. By sampling and analyzing the vibration acceleration of the motor and gear box, the rotation frequency of the motor at 95km/h and the vibration transmission frequency of the transmission system in three directions are obtained.
Research on Pedestrian Multi Object Tracking Based on FairMot Transfer Learning
Authors: Chen Hongjun , Zhao Liheng , Ma Lei 
Published: March 2021

Abstract
Object tracking is divided into two processes: multi object detection and multi object tracking. In this paper, the multi object detection is studied firstly, and the multi object detection algorithms based on prior box anchor and anchor-free are analyzed and compared. Then in the second process of multi object tracking, multi object tracking algorithm are researched: the multi object tracking algorithm based on prior box anchor, the multi object tracking algorithm based on anchor-free. Finally, Finally, an experiment is carried out to track the pedestrians on the road by using FairMot transfer learning, and the metrics of MOTA, IDF1, IDS, MT, ML and FPS are analyzed. Experiments show that under the method of using transfer learning, MOTA can be improved by 4.2 percentage points.
Study of Development & Application about Assembly Technology of Optical Fiber in High-capacity Satellite
Authors: Song Xiaohui , Xie Jiulin , Wang Wei , Guo Liang , Zhang Qiang , Cheng Yue , Liu Xiaoyi 
Published: March 2021

Abstract
This article proposed a method for final assembly of optical fiber cables based on the needs of satellite installation of optical fiber cables, the structural features of optical fiber cables, and on the basis of fully demonstrating the installation conditions of optical fiber cables. The articles also analyzed factors that affect the quality of the final assembly of optical fiber cables based on the rationality of wiring and the effectiveness of cable protection and the reliability of electrical connector insertion. The method proposed by the article greatly improves the assembly efficiency while effectively ensuring the safety and reliability of the final assembly of the product.
Research of Fluid Flow Characteristics forSurface Morphology of Solid
Authors: Yan Zhiwei , Liu Jiquan , Zhu Kun 
Published: March 2021

Abstract
A large number of asperities have been left on the solid surface after mechanical processing. Aiming at this complex shape, a laminar flow model between solid contact interfaces is established, and the irregular concavo-convex structure is used to simulate the interface structure in micro-channels, then it is studied for the flow characteristics of incompressible viscous fluids in random micro-channel. The channel of model adopts the form of 2D and 3Dmodel. The interface structure in the microchannel is simulated with irregular micro-convex bodies, and physical quantities such as aspect ratio and length ratio are defined. It is used to analyze the influence of micro-channel on the velocity and pressure of fluid flow by Computer simulation technology. The velocity andpressure of the fluid in the microchannel increase as the area ratio of the micro-convex to the micro-channel increases, the length of the micro-protrusion is not the main factor affecting the fluid flow characteristics, the structure of the micro-convex is is one of the key factor affecting the fluid flow characteristics, they are showed by the simulation results. This research provides certain guidance and reference for solid surface design.
An Active Handoff Algorithm based on The Retention Time of Complementary Nodes
Authors: Zheng Xiaojian , Fu Tiewei 
Published: March 2021

Abstract
Due to the frequent joining and quitting of nodes in P2P network, it often leads to the failure of accessing nodes, and the decrease of system availability. Some of the existing methods are to switch a node’s service to its backup node after it is found to exit, and the backup node will continue to provide services. But the actual results are not ideal. The reason is that the service request of the node is always not responded from the time when the node exits the network to the time when the service switches to the backup node. This paper proposes an active handoff algorithm based on the retention time characteristics of complementary nodes. By predicting the exit time of the node, it finds the node complementary to the node in time as the backup node, and actively switches to the backup node before the node exits the network, so as to realize the service continuity. Experimental results show that the algorithm reduces the access failure and improves the system availability.
A New Type of Right-leg-drive Circuit ECG Amplifier Using New Operational Amplifier
Authors: Yang Wang 
Published: March 2021

Abstract
The low-power consumption and low-noise sensor remain an important challenge in Electrocardiogram (ECG) sensor field. A new operational amplifier (op-amp) design is proposed in this study, and it is integrated into the traditional “right-leg-drive” circuit to cancel out the common-mode interference. Besides, the gain of this circuit can be controlled by adjusting the value of these resistors. Then, the traditional op-amp is redesigned to improve the performance of this circuit. Some improvements are made on the basis of the traditional sleeve-type cascade amplifier to obtain good gain and gain bandwidth. At the same time, power consumption is not too high. Meanwhile, to minimize the noise of the op-amp without using large value capacitors, pseudo-resistors are used. The right-leg-drive circuit is used in the overall process to ensure good common-mode rejection ratio (CMRR) performance. For the newly designed op-amp, its gain can reach 60db, and the operating frequency of the circuit is between 0.1HZ and 108HZ, and the error is no more than 10%. The differential mode gain of the overall circuit is 43.4db, and the error is within 5db. The total power consumption of the circuit is 3.17u watts, which is less than the specified maximum power consumption, and the total integrated input-referred noise is 3.786μVRMS, which is less than the specified maximum circuit noise. The total capacitor usage is 1nF, less than the specified maximum capacitor usage. To sum up, the ECG sensor is designed using the “right leg drive circuit” and a new type of amplifier is designed to eliminate common-mode interference and improve the performance of the amplifier.
A formal framework for robot to understand compound concepts
Authors: Liao Yuanxiu , Yan Mingrui , Li Xinqiao 
Published: March 2021

Abstract
Social robots are playing an important role in assisting humans in shopping, caring for the elderly and educating children. However, to accomplish these tasks with high quality, social robots still face huge challenges. One of the main challenges is how robots understand the intentions of human behavior and predict human needs in order to respond appropriately. Most existing social robots determine the intentions and needs of humans based on the postures and actions in a specific scene. We know that it is not enough to understand human intentions and needs based on gestures and actions. It will be more perfect to understand human intentions and needs through natural language communication. To this end, we propose a formal framework for describing robots’ understanding of simple and compound concepts. Once the robot has the ability to understand compound concepts, it has the ability to understand some simple knowledge. We first introduce the formal methods of expressing the connotation and extension of simple concepts, and then propose a framework for robots to understand simple concepts, and finally build a formal framework for robots to understand complex concepts. This framework provides a formal method for robots to understand knowledge.
Ride comfort analysis and optimization of heavy vehicles based on entire dynamic model
Authors: Zhu Jizhi , Wang Youjie , Yang Liwei , Liu Yue 
Published: March 2021

Abstract
Ride comfort improvement based on dynamic characteristic analysis is investigated. An entire dynamic model of a typical heavy truck is developed in order to obtain further investigation. The effects of sensitive mode shapes pitch around rear axle, bounce, pitch around front axle and cab resonance on vibration transmissibility from wheel to cab base are observed. The influence of leaf spring stiffness at front and rear axles on important mode shapes has been presented. Appropriate stiffness adjustment is suggested to improve ride comfort level, and the research flow can be also used for any other vehicle design.
Analysis and Design of Power Electronic Transformer for Smart Grid Application
Authors: Yichen Jin 
Published: March 2021

Abstract
With the development of smart grid and energy Internet, power electronic transformer has become one of the key equipment in power system. Its characteristic research and structure design have become a hot topic in related research fields. In order to take into account, the access of traditional AC motor system and renewable energy system, a three-stage power electronic transformer simulation model based on Simulink platform is built in this paper, and the key characteristics are analyzed and verified. With the application of power electronic transformer, the AC voltage can be adjusted quickly, and the AC / DC interface can be taken into account in the transmission system.
Design of DDR3 SDRAM read-write controller based on FPGA
Authors: Yi Jinhui , Wang Mingfu , Bai Lidong 
Published: March 2021

Abstract
In order to flexibly adjust the frame delay of real-time image acquisition by high-resolution cameras, which is based on optical fiber communication protocol, and facilitate subsequent control, this article uses MT41J128M16JT-125IT DDR3 SDRAM of Mircon company to cache image data. And based on the MIG controller that comes with Xilinx Vivado development tool for continuous read and write control, the results show that when the camera system is designed at 2fps and the system clock is 50Mhz, the system data bandwidth is 2.2Gbps. The selected DDR3 chip has a bandwidth of 6.25Gbps, which can meet the real-time transmission requirements of the design system.
Research on Microstructure and Properties in Welded Joint of 700 MPa grade Low Carbon Micro-alloy steel
Authors: Zhixiang GU 
Published: March 2021

Abstract
High-strength residual heat treatment steel bar was tested with welding thermal simulation in Gleeble 3500. Effect of heat input on the microstructure, impact toughness and microhardness of weld heat-affected zone (HAZ)was studied. The results show that with the increase of t8/5, microstructure of coarse grain heat-affected zone (CGHAZ)transforms into granular bainite and pearlite in stead of ferrite, feather-like upper bainite and strip-like lower bainite, HAZ impact value increases firstly then decreases and reaches maximum at t8/5= 100s and the hardness decreases. And when t8/5 increased to 60s there were only ferrite and pearlite in the microstructure of CGHAZ. The impact energy of high-strength residual heat treatment steel bar would be at the range of a good level for physical production with the range of t8/5 from 20s to 300s.
Design and Implementation of Course Arrangement Model Based on Reforming Deep Reinforcement Learning
Authors: Lei Zhang , Xu Fangqin 
Published: March 2021

Abstract
Aiming at the problem of curriculum arrangement, this article abstracts it into two subjects and multiple attributes, and successfully abstracts the problem into a curriculum arrangement model design problem. This paper analyzes the characteristics of the curriculum arrangement problem and combines the characteristics of the deep reinforcement learning algorithm to propose a reformed deep reinforcement learning model. At the same time, the state representation method and action selection method of each stage are designed. Different from general deep reinforcement learning, this article no longer uses action set as the behavior process, and selects the course by optimizing the weight to achieve the purpose of course arrangement. Finally, this paper carried out a comparative experiment to verify the algorithm, which proved that the deep reinforcement learning algorithm based on transformation can effectively solve the problem of curriculum arrangement, and has higher efficiency and higher learning ability than genetic algorithm.
Research on the Relationship Between the Performance and Geometry of Secondary Optical Elements in Fresnel Concentrating System
Authors: Pan Yeyang 
Published: March 2021

Abstract
Secondary optical elements play an important role in solar concentrating systems, including increasing tracking error tolerance and radiation flux homogenization. In this paper, for the Fresnel lens concentrating system, the SOEs with various geometric shapes are compared, including the quadrangular frustum pyramid SOE(KFTS-type SOE), quadrangularprism SOE, circular frustum SOE, cylinder SOE and concave lens. The influence of the shape of the incident plane and the length of the SOE on the uniformity of the solar radiation distribution of the output spot is analyzed by Monte Carlo rays tracing method. Simulation results show that KFTS-type SOE has advantages in improving the radiation uniformity of the receiving surface. Furthermore, two new SOEs are designed on the basis of KFTS-type SOE, one of them has a significant improvement in increasing the acceptance angle when using the same amount of materials.
Simulation of dual-wavelength self-similar pulse based on two dimensional material fiber laser
Authors: Liu Weici , Wu Yunting , Qi Lei 
Published: March 2021

Abstract
Multi-wavelength self-similar fiber laser has many advantages that other lasers do not have. It has many applications in industry, sensing, medical, military, communication and other fields. Two dimensional material devices can be used as saturable absorbers to construct dual-wavelength self-similar pulse mode-locked fiber lasers. In this paper, the evolution characteristics of dual-wavelength self-similar pulse based on two dimensional material mode-locked fiber lasers are analysed.
Design of Single Phase Voltage Inverter Control Circuit Based on Single Chip Microcomputer
Authors: Su Qiaoping , Liu Yuan , Wu Shijie 
Published: March 2021

Abstract
In this paper, a control circuit is designed, which can reverse the direct current into alternating current. This circuit is based on STC12C5A60S2 MCU, using its PCA function to achieve two SPWM signals, then inverts DC 12V to AC 24V. The data test shows that the AC voltage obtained by this device is stable and the frequency error is small, so it can be applied to the demand field of small-scale inverters.
Study on thermal cracking of mudstone induced by thermal recovery of heavy oil
Authors: Huan Xiaolin , Sun Feng , Xue Shifeng 
Published: March 2021

Abstract
Steam assisted gravity drainage (SAGD) is an effective thermal recovery method for heavy oil reservoirs. Mudstone interlayers with low-permeability may block the expansion of the steam chamber and then reduce the SAGD thermal recovery. However, the mudstone may be thermally fractured by the coupling effects of thermal-hydro-mechanical (THM) in the SAGD production process. In this study, taking a heavy oil reservoir in Xinjiang as an example, we studied the thermal cracks’ initiation of mudstone interlayer by numerical simulation. Results show that: (1) Temperature changes are the main factor of affecting mudstone’s fracturing or crack propagation, and the effects of mudstone interlayer’s thickness are slightly. (2) With larger Young’s modulus, the critical fracturing temperature is lower. (3) In the peak period of gravity drainage, along the horizontal well, most of the mudstone interlayers reach the fracturing critical value and produce thermal cracks. The existence of thermal cracks will improve the SAGD productivity.
Research on Key Technologies of Campus Microgrid Control
Authors: Hu Zhihui , Liu Wenzhou 
Published: March 2021

Abstract
Taking campus microgrid as the research object, combining the characteristics of campus energy use and the development trend of multi-energy complementary microgrid, a typical architecture of microgrid system suitable for campus is proposed. This paper discusses the significance and future development prospect of microgrid to ensure the safety of campus energy consumption.
Research on initial alignment method of vehicle-mounted SINS based on reverse navigation
Authors: Yang Chen , Cai Yuanwen , Xin Chaojun , Shi Meiling 
Published: March 2021

Abstract
In order to improve the alignment accuracy and speed of vehicle-mounted SINS, an initial alignment scheme of “inertial solidification alignment + Kalman filter fine alignment based on reverse navigation” is proposed in this paper. Firstly, an inertial solidification alignment algorithm is derived, the initial alignment problem is transformed into Wahba problem, and the optimal attitude matrix at the initial moment is obtained by singular value decomposition algorithm. The inertial solidification alignment algorithm is more concise and intuitive than the traditional alignment algorithm of geocentric inertial coordinate system. Then, we analyzed the effectiveness of rotation modulation technology to improve alignment accuracy theoretically and proved it by simulation. And it is pointed out that the application platform space is limited and the system cost is increased when using this technology. Furthermore, in order to overcome the shortcomings of using rotation modulation technology, a Kalman filter algorithm based on reverse navigation is derived. By reusing the data stored during the inertial solidification alignment, the alignment time is extended equivalently, the initial attitude error is reduced and the attitude calculation accuracy after forward navigation is improved, higher precision alignment is realized. Finally, the effectiveness of the initial alignment scheme is verified by simulation.