bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Calibration Method for On-line Radiation Monitoring of γ-ray Source
Authors: Shang Yu , Zhang Ruidan , Ma Ying 
Published: April 2022

Abstract
In the on-line radiation monitoring of γ -ray source, the active online monitoring module can realize real-time recording of the radiation dose equivalent value and count rate in the detector. Because the amount of radiation at different measuring points is different, their values vary from place to place, so there is no exact value that is completely suitable for all kinds of measurement situations, so the nonlinear relationship between counting rate and dose rate is deduced. For the difference of the dose at the measuring point, the relationship between them will increase with the continuous accumulation of radiation dose, which will have an impact on the iterative algorithm. In this paper, the LM algorithm is used to solve the fitting function model, and the feasibility of the algorithm is verified by MATLAB software programming. The results show that the parameters of the objective function model can be obtained by the LM algorithm, and the relative error of the eighth polynomial can be minimized and a better fitting effect can be achieved.
Ti3C2Tx MXene Decorated Textiles with Low Thermal Emissivity
Authors: Wang Wenjuan , Zhu Yining , Ghosh Pintu , Li Qiang 
Published: April 2022

Abstract
Generally, commercial textiles show high mid-infrared emissivity and the thermal radiation accounts around 50% of the heat loss. However, conventional clothes usually increase the thickness to reduce the heat conduction without considering lowering the mid-IR emissivity. Thus textiles with reducing infrared emissivity for passive radiative heating offer an energy-free way to keep human body warm. Herein, we reduced mid-IR emissivity of the textiles by covering Ti3C2Tx MXene sheet on the cotton fabric through dip coating. MXenes as a new family of two-dimensional (2D) materials shows strong absorption in visible and near-IR regions and strong reflection in mid-IR region. Through simple and scalable method of dip coating, we fabricate four samples with different MXene content from 0.05 mg/cm2 to 0.20 mg/cm2 with 0.277∼0.431 mid-IR emissivity. This material and preparation method can be used for personal thermal management on traditional clothing.
Research and Design of Etching Line about Nuclear Track Membrane
Authors: Li Yunjie , Mo Dan , Duan Jinglai , Yao Huijun 
Published: April 2022

Abstract
Nuclear track membrane is a new type of membrane material with uniform pore size distribution. It can be used as a high-precision filtration membrane and there is a wide range of applications in sewage treatment, cell filtration, and biomedicine. The main production processes of nuclear track membrane include heavy ion irradiation and chemical etching, so there is a great significance about the research and design of etching lines. The main contents studied in this paper include the physical design principle of the etched line, the basic engineering structure, the basic control system architecture, and a complete HMI. The research plays an important role in the development and large-scale application of nuclear track membrane in this paper.
Study on the Simulation and Experiment of Ultrasonic-assisted Vibration Drilling of Ti6Al4V
Authors: Li Yan , Yang Yi , Wang Yan , Gao Feng 
Published: April 2022

Abstract
Titanium alloy is a typical difficult-to-cut material used in most industrial fields, so its machinability is characterized by low efficiency and poor quality using Conventional Drilling (CD). To address this issue in drilling workpiece of Ti6Al4V the ultrasonic vibration with high-frequency and low-amplitude is applied in the feeding direction of drill bit. Based on Johnson-cook constitutive model of workpiece material, a 3D FEM cutting simulation is conducted to analyse the variation trend of thrust force and the formation of hole burr under different processing parameters. The simulation and experimental results demonstrate that the ultrasonic vibration can convert continuous cutting into periodical intermittent cutting, which is helpful to break chip and deburr as well as enhance inner wall quality of hole significantly. Moreover, ultrasonic assisted drilling decreases the thrust force, improves the rigidity of the cutting tool in the process of drilling and facilitates removing the workpiece material. Therefore, the ultrasonic vibration can effectively promote the drilling quality of titanium alloys Ti6Al4V compared with CD.
Research on Self-melting Snow Material of Asphalt Pavement
Authors: Zhang Yongli , Wang Xiaosen , Meng Huilin 
Published: April 2022

Abstract
The effects of pozzolan and calcium chloride on the performance of asphalt mixtures were analyzed by laboratory performance tests. Using the maximum bulk density of mixed materials after vibration compaction, Determined the reasonable ratio of calcium chloride to fill the voids of pozzolanic material. The amount of surface modified material was determined based on the precipitation rate of the melting snow component and the effect on asphalt performance under cyclic water immersion conditions. Tested the performance of the asphalt mixture, self-melting snow material can improve the low temperature performance of the mixture. There is a certain reduction in high temperature performance and water stability, but all meet the requirements of normative indicators.
Temperature Field Simulation and Analysis of Connector for Power Battery
Authors: Jin Biao , Fei Qiang , Zhang Tong , Wang Ying-shun , Zou Wuyuan 
Published: April 2022

Abstract
It’s very important to make use of finite element analysis software to assist the structure design of power battery connector. In this paper, Ansys workbench was used to establish the electric-thermal coupling model of finite element simulation for the connector assembly, and the temperature field simulation calculation and analysis were carried out for the connectors of different thickness under the condition of high current. The results show that the maximum temperature of the connector increases with the decrease of its cross-section thickness, and the higher the current is, the longer the power time will be, the higher the temperature will be. In addition, the connector with thickness of 0.8 mm has the risk of fusing under the action of 500 A current.
Design and Test of Natural Gas Diesel Dual Fuel Engine Based on SolidWorks
Authors: Fei Qiang , Jin Biao 
Published: April 2022

Abstract
Taking ZS1115 diesel engine as an example, on the basis of basically not changing the original structure, natural gas inlet valve, natural gas air mixer and natural gas governor are added to realize dual fuel combustion control. The model of dual fuel engine is established by using SolidWorks software, and the size and performance parameters of main mechanical structures are optimized and simulated by using modules such as simulationmotion, simulationxpress and simulationflow. The bench test results show that the dual fuel engine designed based on SolidWorks runs stably, and the power, economy and emission performance meet the design requirements.
Design and Motion Simulation Analysis of a Novel 2D Bionic Flutter Aircraft
Authors: Wang Yaoyi , Sun Ye , Jiang Shaoqi , Li Wenbo 
Published: April 2022

Abstract
In order to improve the symmetry of the flutter mechanism in the bionic flutter aircraft, and then improve the overall motion stability of the flutter aircraft. In this paper, an innovative flutter wing configuration is designed based on a planar crank-slider mechanism and a sparrow model. The geometric relationship of the flutter mechanism is established, the motion of the flutter aircraft is modeled, and the dimensions of the model are optimized. The geometric relationship of the flutter structure was simulated and analyzed by CATIA. The results show that the upper limit angle of the designed flutter structure is βmax=25.82° and the lower limit angle is βmin=6.34°. The CATIA simulation data are consistent with the theoretical values of the established structural geometry model. Meeting the needs of small and medium-sized flutter aircraft.The design provides a theoretical basis for the design and development of the bionic flutter vehicle and the fabrication of a solid prototype.
Infrared Small Target Detection Algorithm Based on Local Spatial Gradient Peak
Authors: Yan Zujing , Xi Peiyao , Luo Man , Xin Yunhong 
Published: April 2022

Abstract
A sparse infrared small target detection algorithm based on local spatial gradient peaks is proposed to deal with the problem of slow running speed and edge sensitivity in low-rank decomposition methods.The detection steps are as follows. In the first step, the image expansion operation is used for preprocessing. We use the circular structure element to sharpen the edges of targets and smooth the background noise. Then, the saliency gradient features of the target local region are applied to calculate the overlapping gradient information of the image after expansion. The local area with a larger gradient peak is located in the original image, and the selected local area is considered to be the region of interest with candidate targets. Finally, we use the advanced accelerated proximal gradient algorithm to perform matrix decomposition in the extracted local regions of interest to extract sparse infrared small targets. Extensive experimental results under real scenarios illustrated that compared with the baseline low-rank sparse decomposition method, the proposed approach runs faster and shows superior detection performance in the comprehensive evaluation index.
Simulation of Electromagnetic Radiation Environmental Impact of 5G Application Base Station
Authors: Gong Yuan , Chi Qin , Liu Qinxin , Pan Chan , He Mu 
Published: April 2022

Abstract
Based on the understanding of the radiation impact of 5G application base station construction on the environment, this paper simulated the electromagnetic radiation level of the environment after 5G application base station construction by establishing three numerical models. The study found that the prediction model based on population and mobile phone traffic characteristics can be used to predict the radiation environment of the whole region on the premise that 5G communication has been widely used by people, and this model is also suitable for the prediction and simulation of 3G/4G radiation environment.
Optimization of Power Cable Layout Scheme for Point Absorption Wave Energy Converters
Authors: Han Guoxin , Bao Xingxian 
Published: April 2022

Abstract
This paper studies the power cable of the point absorption wave energy converters (WECs). As bearing the cyclic loads induced by WECs motion, waves and ocean currents, cable is prone to damage and failure. Therefore, it is necessary to optimize the design of the power cable to improve its performances and ensure the service safety of the WECs system. The idea of setting buoyancy modules on different positions of the power cable is proposed in this paper. The length and weight of the power cable and the length and position of buoyancy modules are considered to optimize the design of the power cable in the numerical simulation. The optimal design is evaluated based on the maximum effective tension and curvature of the power cable and the captured power of the WEC. The schemes of the cable with buoyancy modules and without buoyancy modules are compared based on the maximum effective tension and curvature of the power cable and the captured power of the WEC. The results show that the cable performance is significantly improved after setting the buoyancy modules, but the improvement for the captured power of the WEC is little.
Modeling and Simulation Analysis of the Rhombic Car based on 3-DOF Handling Model
Authors: Zhang Yi , Zou Xiaomao , Gong Yu 
Published: April 2022

Abstract
A three degree of freedom(3-DOF) mathematical model of the handling and stability of the rhombic car is established in order to study the dynamic performance of the rhombic car. The dynamic performance of the rhombic car under different working conditions is obtained by the simulation analysis of the model. Through the road test of the rhombic car, the correctness of the mathematical model of the handling and stability is verified. Through the comparison between experimental data and simulation data, the maximum error is about 9.3%. Therefore, the mathematical model is correct. The 3-DOF model of the rhombic car can be used for research and optimization, which has good practical significance to the engineering.
Application of Modern Acoustic Technology and Acoustic Emission Equipment in Rock Mechanics
Authors: Zhao Congcong , Zhou Zilong , Huang Yinghua , Liu Chang 
Published: April 2022

Abstract
The development of modern physics has promoted the progress of traditional rock physics and mechanics, especially Sheng emission technology based on acoustics. In order to study the acoustic characteristics of rock specimens under compression, the test is carried out with the help of Sheng emission technology, the mechanical characteristic parameters of rock physics and mechanics are measured, and the sound source position and radiation energy parameters of rock fracture are obtained. Combined with the numerical simulation software MATLAB and fractal theory, the energy release mechanism of rock samples is analyzed. The acoustic characteristics of rock samples are remarkable, and the three-dimensional spatial coordinates of rock fracture source can be measured scientifically and accurately, with an accuracy of 99.98%, making it possible to reproduce the three-dimensional fracture source. It is found that the distribution of main fracture sources and high-energy fracture sources can be one-to-one corresponding and consistent with the external fracture failure mode of rock; Through interpolation inversion and energy parameter simulation analysis, slice processing is carried out to obtain the inversion results of energy distribution and test pieces. The process of microcrack propagation and propagation is completely consistent. Based on the analysis of physical mechanics and acoustic characteristics: the numerical simulation analysis of rock specimen failure process can not only reflect the dynamic failure process of rock, but also provide guidance for the prediction and analysis of mine disaster evolution.
Analysis of Optimal Parameters for Discriminating Cavitation Types by SSAE-RF
Authors: Kang Ziyang , Liu Zhiliang 
Published: April 2022

AbstractHydro power has many advantages, such as pollution-free, relatively mature technology and high security. Hydro turbine is the core component of hydro power station. Cavitation has always been one of the main threats to the safe operation of hydraulic turbine units. In order to improve the overall classification and recognition accuracy of cavitation noise signal features of hydro turbine, a deep learning algorithm model based on stack sparse coding combined with random forest is proposed, and the optimal parameter selection of the algorithm model is analyzed in detail, so as to enhance the efficiency of deep learning algorithm. A group of cavitation noise signals with different intensities are selected. On the premise that other parameters of the algorithm remain unchanged, and choose a different parameter each time of training, and the optimal parameters of the algorithm are finally found; The default parameter algorithm model and support vector machine algorithm are used for comparison. The results show that the deep learning algorithm is superior to the traditional classification and recognition algorithm, and the overall classification and recognition accuracy of the deep learning algorithm using the optimal parameters is effectively improved. The research results can be used as an important reference for the deep learning algorithm to extract, classify and identify the cavitation noise intensity characteristics of hydro turbines.
Monitoring and Analysis of the Current Environmental Situation of Electromagnetic Radiation from 5G Application Base Stations
Authors: Gong Yuan , Guo Xiaoqi , Liu Qiuxin , Long Yifei , Li Yangwei 
Published: April 2022

Abstract
With the rapid development of the 5G era, the concern of human health risks caused by the construction of mobile base stations has also come to light. To understand the current situation of the electromagnetic radiation environment of 5G application base stations is the basis for avoiding the old road of “pollution before treatment” in environmental management and solving the problem of neighbourhood avoidance. At the beginning of the year, we started to monitor the electromagnetic radiation environment of 5G application base stations in major urban roads, logistics centres, residential areas and university gathering areas, etc. According to the analysis of the monitoring data, the electromagnetic radiation environment levels of 5G application base stations at various monitoring points in urban areas all meet the requirements of the Electromagnetic Environment Control Limits (GB8702-2014). With the development of 5G and the application of various scenarios, it is still necessary to continuously monitor the electromagnetic radiation environment in the future in order to grasp its changing trend.
Satellite Observations of Karman Vortex Streets Induced by Islands from the Aspects of SSC in Hangzhou Bay, China
Authors: Wang Jianhui 
Published: April 2022

Abstract
We explored the details of Karman vortex streets (KVS) induced by islands in the Hangzhou Bay using high resolution Chinese Gaofen-1 data and Landsat-8 data. Thirty images, including 15 images obtained by Wide-Field-View (WFV) sensor from Chinese Gaofen-1 and 15 images obtained by Operational Land Imager (OLI) aboard Landsat-8, were applied to retrieve Suspended Sediment Concentration (SSC) based on a prior model. The results show that: 1) The Karman vortex streets induced by small islands can be detected clearly by high resolution satellite data from the change of SSC. 2) The Karman vortex streets contain 3-5 subunits, and the further away from the island, the larger the scale of vortex streets. Generally, the length of the vortex street is between 1500 m and 9800 m.
Research on Fast Self-alignment Method of SINS under Vehicle Jitter and Leveling Disturbance
Authors: Li Pu , Yang Tao , Li Ming , Zhao Xiao-xin 
Published: April 2022

Abstract
Using the combination of simulation and actual measurement, analyze the impact of disturbances such as the jitter of the launch vehicle drive motor and the leveling motion of the launch vehicle on the output signals of the gyroscope and accelerometer, clarify the alignment error source of the SINS, and combine the error model to design based on the Kalman classical filter. For the algorithm’s variable mode filtering scheme, a variable mode filtering alignment method using the output pulse threshold of the horizontal gyro is proposed, and the filtering method in the fine alignment stage is improved. Vehicle experiments show that the proposed variable mode filtering method has a simple algorithm and a small amount of calculation, and can effectively suppress dynamic disturbances such as engine jitter and vehicle leveling motion, improve the convergence speed of the azimuth error of the strapdown inertial navigation system, and reduce the azimuth misalignment angle estimate bias.
Research on Diagnosis of Loss of Flow Accidents in Nuclear Reactor Coolant System
Authors: Qin Liming , Yang Xiaohua , Liu Jie , Ma Jiayu 
Published: April 2022

Abstract
The reactor coolant system is one of the most important systems in a nuclear power plant. The safe and stable operation of the reactor coolant system is related to the safety of the nuclear power plant. With the rapid development of nuclear power technology, it is particularly important to ensure the safety of nuclear power plants. This paper takes the third-generation reactor AP1000 as the research object, firstly analyzes the typical accidents of the coolant system, and establishes a three-layer fault model, and then introduces the counterfactual reasoning method to take the Loss of Flow Accident as an example to identify the accident, and compares it with the traditional data-driven The Bayesian network diagnosis method was compared with the Bayesian network diagnosis method, and finally the accident was diagnosed by the simulation software Pctran. The results show that the method can accurately identify the fault and is better than the Bayesian method, which can provide decision support for accident handling and ensure the safety of the reactor.
Detection of Harmonic Components using the FFT and Instantaneous Reactive Power Theory
Authors: Zhang Shuang , Tian Bei , Liang Jian , Cheng Yuanchu 
Published: April 2022

Abstract
Harmonics is a widespread phenomenon in power system. With the rapid development of new energy generation, it is more urgent to monitor and suppress harmonics in power system. Considering the accuracy and real-time of harmonic detection, a novel harmonic detection method based on FFT and instantaneous reactive power theory is proposed. In this method, the harmonic frequency of the signal to be measured is first determined by windowed FFT, and then the harmonic amplitude and phase are calculated by an improved harmonic detection method based on instantaneous reactive power theory. The example results show that the proposed method has high detection accuracy and good real-time performance, and it can realize the fast detection of harmonics.
Torque Ripple Control Strategy of Switched Reluctance Motor Based on BP Neural Network
Authors: Xu Junxin , Huang Chaozhi , Cao Wensheng , Wu Yuliang 
Published: April 2022

Abstract
Switched reluctance motor (SRM) has many advantages, but when the motor is running, the fixed turn-on angle will cause the torque ripple of the motor at different speeds and loads. Therefore, an torque ripple control strategy of switched reluctance motor based on BP neural network is proposed. Firstly, the nonlinear relationship among speed, load torque and opening angle is established by using the fitting generalization ability of BP neural network. In this step, the optimal angle data under the minimum pulsation needs to be obtained by simulation. After collecting data, select and classify the data, and then train and improve the neural network, That nonlinear relationship is introduced into the motor control strategy, so that the motor can automatically adjust its opening angle according to different rotational speeds and load torques and achieve the purpose of reducing torque ripple under different working conditions. Finally, the motor simulation model is built in Matlab/Simulink, and the results are analyzed. This control strategy can control and reduce torque ripple.
Unsteady Aerodynamic Simulation Test Based on Ampere Force and Electromagnetic Field
Authors: Hou Yingyu , Li Qi , Zhang Ziqiang 
Published: April 2022

Abstract
Unsteady aerodynamic force refers to the aerodynamic force that the magnitude and direction of the load borne by the aircraft will change with time during flight. Usually, the simulation of unsteady aerodynamic force is completed by wind tunnel test. This paper introduces a new load simulation method based on electromagnetic field and Ampere force. Compared with the traditional wind tunnel test method, electromagnetic field load test will greatly reduce the test cost and make it possible to repeat multiple tests. In order to verify whether the test method is feasible and effective, this paper introduces a number of verification tests, including static load test and dynamic quasi modal test. By comparing the ground test results with those based on ABAQUS simulation, the reliability of the test method is verified. In this test technology, electromagnetic technology is used to study the force of structure, which is of great significance for multi physical field test and aircraft design test.