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Thrust estimate method of an on-orbit Hall thruster using Hall drift current
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作者 Ziying REN Liqiu WEI +5 位作者 Zexin LIU Yanlin HU Liang HAN Hong LI yongjie ding Xiufeng ZHONG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第12期150-159,共10页
In order to realize the thrust estimation of the Hall thruster during its flight mission,this study establishes an estimation method based on measurement of the Hall drift current.In this method,the Hall drift current... In order to realize the thrust estimation of the Hall thruster during its flight mission,this study establishes an estimation method based on measurement of the Hall drift current.In this method,the Hall drift current is calculated from an inverse magnetostatic problem,which is formulated according to its induced magnetic flux density detected by sensors,and then the thrust is estimated by multiplying the Hall drift current with the characteristic magnetic flux density of the thruster itself.In addition,a three-wire torsion pendulum micro-thrust measurement system is utilized to verify the estimate values obtained from the proposed method.The errors were found to be less than 8%when the discharge voltage ranged from 250 V to 350 V and the anode flow rate ranged from 30 sccm to 50 sccm,indicating the possibility that the proposed thrust estimate method could be practically applied.Moreover,the measurement accuracy of the magnetic flux density is suggested to be lower than 0.015 mT and improvement on the inverse problem solution is required in the future. 展开更多
关键词 thrust estimation Hall effect thruster Hall drift current inverse problem Tikhonov regularization
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沥青再生过程中新旧混合沥青力学性能研究 被引量:1
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作者 丁勇杰 唐伯明 +1 位作者 朱洪洲 曹雪娟 《青海交通科技》 2018年第5期40-44,共5页
随着我国的公路建设事业进入建养并重阶段,热再生技术作为一种重要的沥青路面养护技术受到工程界广泛关注。本文通过实验方法测试了沥青路面再生过程中新旧沥青融合后的混合沥青的高温粘度和服役温度区间内的粘弹性指标,并对实验结果进... 随着我国的公路建设事业进入建养并重阶段,热再生技术作为一种重要的沥青路面养护技术受到工程界广泛关注。本文通过实验方法测试了沥青路面再生过程中新旧沥青融合后的混合沥青的高温粘度和服役温度区间内的粘弹性指标,并对实验结果进行数值拟合,得到混合沥青高温粘度的预测方程,可以指导再生沥青混合料的配合比设计及工程应用,从而完善沥青路面热再生技术体系。 展开更多
关键词 道路工程 沥青 再生 旧沥青 粘度 剪切模量
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Simulation study on the influence of magnetic field in the near-anode region on anode power deposition of ATON-type Hall thruster 被引量:3
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作者 Hongbo SU Hong LI +4 位作者 yongjie ding Liqiu WEI Xu ZHANG Chaoying ZHOU Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第9期106-113,共8页
The highest deposition of power and temperature is always near the cusp of the ATON-type Hall thruster.This shows that when there are electrons gathering at the cusp,the distribution of heat load will be uniform,which... The highest deposition of power and temperature is always near the cusp of the ATON-type Hall thruster.This shows that when there are electrons gathering at the cusp,the distribution of heat load will be uniform,which will potentially damage the reliability.Therefore,we optimize the magnetic field near the anode.We changed the magnetic field characteristics in the near-anode region with an additional magnetic screen,and performed numerical simulation with particle-incell simulation.The simulation results show that the magnetic field of the thruster with the additional magnetic screen can alleviate the over-concentration of power deposition on the anode and reduce the power deposition in the anode by 20%,while ensuring that the overall magnetic field characteristics do not change significantly. 展开更多
关键词 Hall thruster magnetic field near-anode power deposition
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Investigation of short-channel design on performance optimization effect of Hall thruster with large height–radius ratio 被引量:1
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作者 Haotian FAN yongjie ding +3 位作者 Chunjin MO Liqiu WEI Hong LI Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第2期1-9,共9页
In this study,the neutral gas distribution and steady-state discharge under different discharge channel lengths were studied via numerical simulations.The results show that the channel with a length of 22 mm has the a... In this study,the neutral gas distribution and steady-state discharge under different discharge channel lengths were studied via numerical simulations.The results show that the channel with a length of 22 mm has the advantage of comprehensive discharge performance.At this time,the magnetic field intensity at the anode surface is 10%of the peak magnetic field intensity.Further analysis shows that the high-gas-density zone moves outward due to the shortening of the channel length,which optimizes the matching between the gas flow field and the magnetic field,and thus increases the ionization rate.The outward movement of the main ionization zone also reduces the ion loss on the wall surface.Thus,the propellant utilization efficiency can reach a maximum of 96.8%.Moreover,the plasma potential in the main ionization zone will decrease with the shortening of the channel.The excessively short-channel will greatly reduce the voltage utilization efficiency.The thrust is reduced to a minimum of 46.1 m N.Meanwhile,because the anode surface is excessively close to the main ionization zone,the discharge reliability is also difficult to guarantee.It was proved that the performance of Hall thrusters can be optimized by shortening the discharge channel appropriately,and the specific design scheme of short-channel of HEP-1350 PM was defined,which serves as a reference for the optimization design of Hall thruster with large height–radius ratio.The shortchannel design also helps to reduce the thruster axial dimension,further consolidating the advantages of lightweight and large thrust-to-weight ratio of the Hall thruster with large height–radius ratio. 展开更多
关键词 Hall thruster large height-radius ratio short-channel design discharge performance numerical simulation
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Particle-in-cell simulation for effect of anode temperature on discharge characteristics of a Hall effect thruster 被引量:1
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作者 Hong LI Xingyu LIU +4 位作者 Zhiyong GAO yongjie ding Liqiu WEI Daren YU Xiaogang WANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第12期96-106,共11页
Propellant gas flow has an important impact on the ionization and acceleration process of Hall effect thrusters (HETs). In this paper, a particle-in-cell numerical method is used to study the effect of the anode tem... Propellant gas flow has an important impact on the ionization and acceleration process of Hall effect thrusters (HETs). In this paper, a particle-in-cell numerical method is used to study the effect of the anode temperature, i.e., the flow speed of the propellant gas, on the discharge characteristics of a HET. The simulation results show that, no matter the magnitude of the discharge voltage, the calculated variation trends of performance parameters with the anode temperature are in good agreement with the experimental ones presented in the literature. Further mechanism analysis indicates that the magnitude of the electron temperature is responsible for the two opposing variation laws found under different discharge voltages. When the discharge voltage is low, the electron temperature is low, and so is the intensity of the propellant ionization; the variation of the thruster performance with the anode temperature is thereby determined by the variation of the neutral density that affects the propellant utilization efficiency. When the discharge voltage is high, the electron temperature is large enough to guarantee a high degree of the propellant utilization no matter the magnitude of the anode temperature. The change of the thruster performance with the anode temperature is thus dominated by the change of the electron temperature and consequently the electron-neutral collisions as well as the electron cross-field mobility that affect the current utilization efficiency. 展开更多
关键词 Hall effect thruster anode temperature neutral flow discharge characteristics particle-in-cell simulation
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Matching characteristics of magnetic field configuration and chamfered channel wall in a magnetically shielded Hall thruster 被引量:1
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作者 Zhaoyu Wang Hong Li +4 位作者 Chao Zhong Yanlin Hu yongjie ding Liqiu Wei Daren Yu 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第10期72-80,共9页
To date, the selection of the magnetic field line used to match the chamfered inner and outer channel walls in a magnetically shielded Hall thruster has not been quantitatively studied. Hence, an experimental study wa... To date, the selection of the magnetic field line used to match the chamfered inner and outer channel walls in a magnetically shielded Hall thruster has not been quantitatively studied. Hence, an experimental study was conducted on a 1.35 k W magnetically shielded Hall thruster with a xenon propellant. Different magnetic field lines were chosen, and corresponding tangentially matched channel walls were manufactured and utilized. The results demonstrate that high performance and a qualified anti-sputtering effect cannot be achieved simultaneously. When the magnetic field lines that match the chamfered wall have a strength at the channel centerline of less than 12% of the maximum field strength, the channel wall can be adequately protected from ion sputtering. When the magnetic field lines have a strength ratio of 12%–20%, the thruster performance is high. These findings provide the first significant quantitative design reference for the match between the magnetic field line and chamfered channel wall in magnetically shielded Hall thrusters. 展开更多
关键词 magnetically shielded Hall thruster magnetic field line chamfered channel wall tangent matching
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Effect of low-frequency oscillation on performance of Hall thrusters 被引量:1
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作者 Liqiu WEI Wenbo LI +1 位作者 yongjie ding Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第7期139-144,共6页
In this paper, a direct connection between the discharge current amplitude and the thruster performance is established by varying solely the capacitance of the filter unit of the Hall thrusters. To be precise, the var... In this paper, a direct connection between the discharge current amplitude and the thruster performance is established by varying solely the capacitance of the filter unit of the Hall thrusters. To be precise, the variation characteristics of ion current, propellant utilization efficiency, and divergence angle of plume at different low-frequency oscillation amplitudes are measured. The findings demonstrate that in the case of the propellant in the discharge channel just meets or falls below the full ionization condition, the increase of low-frequency oscillation amplitude can significantly enhance the ionization degree of the neutral gas in the channel and increase the thrust and anode efficiency of thruster. On the contrary, the increase in the amplitude of low-frequency oscillation will lead to increase the loss of plume divergence, therefore the thrust and anode efficiency of thruster decrease. 展开更多
关键词 Hall thruster low-frequency oscillation PERFORMANCE FILTER
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Simulation of the effect of a magnetically insulated anode on a low-power cylindrical Hall thruster 被引量:1
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作者 yongjie ding Hong LI +7 位作者 Boyang JIA Peng LI Liqiu WEI Yu XU Wuji PENG Hezhi SUN Yong CAO Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第3期156-162,共7页
The intersection point of the characteristic magnetic field line(CMFL) crossing the anode boundary with the discharge channel wall, and its influence on thruster performance and the energy and flux of ions bombardin... The intersection point of the characteristic magnetic field line(CMFL) crossing the anode boundary with the discharge channel wall, and its influence on thruster performance and the energy and flux of ions bombarding the channel wall, have been studied numerically. The simulation results demonstrate that with the increase in distance from the crossover point of the CMFL with the channel wall to the bottom of the thruster channel, the ionization rate in the discharge channel gradually increases; meanwhile, the ion energy and ion current density bombarding the channel wall decreases. When the point of the CMFL with the channel wall is at the channel outlet, the thrust, specific impulse, and efficiency are at a maximum, while the ion energy and ion current density bombarding the channel wall are at a minimum. Therefore, to improve the performance and lifetime of the thruster, it is important to control the point of intersection of the CMFL with the channel wall. 展开更多
关键词 magnetically insulated anode cylindrical Hall thruster PERFORMANCE
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Multi-UAV Cooperative GPS Spoofing Based on YOLO Nano 被引量:2
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作者 yongjie ding Zhangjie Fu 《Journal of Cyber Security》 2021年第2期69-78,共10页
In recent years,with the rapid development of the drone industry,drones have been widely used in many fields such as aerial photography,plant protection,performance,and monitoring.To effectively control the unauthoriz... In recent years,with the rapid development of the drone industry,drones have been widely used in many fields such as aerial photography,plant protection,performance,and monitoring.To effectively control the unauthorized flight of drones,using GPS spoofing attacks to interfere with the flight of drones is a relatively simple and highly feasible attack method.However,the current method uses ground equipment to carry out spoofing attacks.The attack range is limited and the flexibility is not high.Based on the existing methods,this paper proposes a multi-UAV coordinated GPS spoofing scheme based on YOLO Nano,which can launch effective attacks against target drones with autonomous movement:First,a single-attack drone based on YOLO Nano is proposed.The target tracking scheme achieves accurate tracking of the target direction on a single-attack drone;then,based on the single-UAV target tracking,a multi-attack drone coordinated target tracking scheme based on the weighted least squares method is proposed to realize the target drone Finally,a new calculation method for false GPS signals is proposed,which adaptively adjusts the flight trajectory of the attacking drone and the content of the false GPS signal according to the autonomous movement of the target drone. 展开更多
关键词 UAV safety GPS spoofing MULTI-UAV target detection
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An LSTM-Based Malware Detection Using Transfer Learning 被引量:1
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作者 Zhangjie Fu yongjie ding Musaazi Godfrey 《Journal of Cyber Security》 2021年第1期11-28,共18页
Mobile malware occupies a considerable proportion of cyberattacks.With the update of mobile device operating systems and the development of software technology,more and more new malware keep appearing.The emergence of... Mobile malware occupies a considerable proportion of cyberattacks.With the update of mobile device operating systems and the development of software technology,more and more new malware keep appearing.The emergence of new malware makes the identification accuracy of existing methods lower and lower.There is an urgent need for more effective malware detection models.In this paper,we propose a new approach to mobile malware detection that is able to detect newly-emerged malware instances.Firstly,we build and train the LSTM-based model on original benign and malware samples investigated by both static and dynamic analysis techniques.Then,we build a generative adversarial network to generate augmented examples,which can emulate the characteristics of newly-emerged malware.At last,we use the augmented examples to retrain the 4th and 5th layers of the LSTM network and the last fully connected layer so that it can discriminate against newly-emerged malware.Actual experiments show that our malware detection achieved a classification accuracy of 99.94%when tested on augmented samples and 86.5%with the samples of newly-emerged malware on real data. 展开更多
关键词 Malware detection long short term memory networks generative adversarial networks transfer learning augmented examples
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Study on the influence of the discharge voltage on the ignition process of Hall thrusters
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作者 Wenbo LI Liqiu WEI +6 位作者 Hong LI yongjie ding Jianning SUN Haikuo CAI Daren YU Shangmin WANG Ning GUO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第9期25-37,共13页
A high-speed charge-coupled device camera was used to capture images of the plume and acceleration channel of a Hall effect thruster during ignition at different discharge voltages.To better understand the influence o... A high-speed charge-coupled device camera was used to capture images of the plume and acceleration channel of a Hall effect thruster during ignition at different discharge voltages.To better understand the influence of changes in the discharge voltage on the plasma parameters during thruster ignition,a particle-in-cell numerical model was used to calculate the distribution characteristics of the ion density and electric potential at different ignition moments under different discharge voltages.The results show that when the discharge voltage is high,the ion densities in the plume and acceleration channel are significantly higher at the initial phase of thruster ignition;with the gradual strengthening of the ignition process,the propellant avalanche ionization during thruster ignition occurs earlier and the pulse current peak increases.The main reason for these phenomena is that the change in the discharge voltage results in different energy acquisitions of the emitted electrons entering the thruster channel. 展开更多
关键词 Hall effect thruster ignition process discharge voltage PIC simulation CCD image
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Numerical study of the effect of aft-loaded magnetic field on multiple ionizations in Hall thruster
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作者 Demai ZENG Hong LI +4 位作者 Jinwen LIU yongjie ding Liqiu WEI Daren YU Wei MAO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第7期45-52,共8页
It is assumed that the shift of a strong magnetic field region with a positive gradient from exit plane to outside, namely the transit from a normal loaded magnetic field to an aft-loaded one, enhances the multiple io... It is assumed that the shift of a strong magnetic field region with a positive gradient from exit plane to outside, namely the transit from a normal loaded magnetic field to an aft-loaded one, enhances the multiple ionization process in the magnetically shielded Hall thruster. To confirm this conjecture, a comparative study is carried out numerically with a particle-in-cell method. The simulation results prove that compared with the normal loaded magnetic field, the application of aft-loaded magnetic field enhances the multiple ionization process. This study further analyzes the ionization characteristics of the transition from low-charged ions to high-charged ions under two magnetic field conditions and the influence of the magnetic strength of aft-loaded magnetic field on the multiple ionization characteristics. The study described herein is useful for understanding the discharge characteristics of Hall thruster with an aft-loaded magnetic field. 展开更多
关键词 Hall thruster aft-loaded magnetic field multiple ionization electron temperature
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Numerical simulation of the start-up process of a miniature ion thruster
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作者 Xinyong YANG Liqiu WEI +7 位作者 Wenjia JIANG Tianyuan JI Liwei ZHOU Hong LI yongjie ding Jingfeng TANG Ning GUO Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第7期63-73,共11页
A particle-in-cell Monte Carlo collision model of a discharge chamber is established to investigate the start-up process of a miniature ion thruster.We present the discharge characteristics at different stages(the ini... A particle-in-cell Monte Carlo collision model of a discharge chamber is established to investigate the start-up process of a miniature ion thruster.We present the discharge characteristics at different stages(the initial stage,development stage,and stable stage)according to the trend of the discharge current with time.The discharge current is the sum of the sidewall current and the backplate current.During the start-up process,the sidewall current lags behind the backplate current.The variation and distribution characteristics of the discharge current over time are determined by the electron density distribution and electric potential distribution. 展开更多
关键词 miniature ion thruster discharge chamber start-up process Monte Carlo collision
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Special issue on selected papers from CEPC 2021
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作者 Yanhui JIA Kan XIE +1 位作者 yongjie ding Daren YU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第7期1-2,共2页
Electric propulsion technology is the most active professional technology in the field of space propulsion in recent years.China began the research of electric propulsion technology in the 1970s,and entered the stage ... Electric propulsion technology is the most active professional technology in the field of space propulsion in recent years.China began the research of electric propulsion technology in the 1970s,and entered the stage of rapid development after 2000.It has successively completed the principle research,technical breakthrough and ground test verification.Driven by the increasing demand for space missions,various new types of electric propulsion are emerging. 展开更多
关键词 BREAKTHROUGH successively SPACE
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Research progress on supramolecular structures of asphalt
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作者 yongjie ding Yuan Xi +2 位作者 Yanghui Wang Rui Zhang Danni Li 《Journal of Traffic and Transportation Engineering(English Edition)》 EI CSCD 2023年第2期230-242,共13页
The properties of asphalt binder play an essential role in the design life of asphalt pavement.Analysis of asphalt mechanical behaviors based on the chemical structures provides the theoretical basis for the improveme... The properties of asphalt binder play an essential role in the design life of asphalt pavement.Analysis of asphalt mechanical behaviors based on the chemical structures provides the theoretical basis for the improvement of asphalt performance in service life.Intermolecular interactions have a significant impact on the macroscopic properties of asphalt,a colloidal material,resulting in the parameters characterizing asphalt molecular structures fail to directly connect with mechanical properties of asphalt.This paper introduces the supramolecular theory,presents a brief review of existing supramolecular models and research methods of asphalt,aiming to explore a new methodology for the investigation between asphalt microstructures and macroscopic properties.Results showed the supramolecular theory focuses on the intermolecular interactions,providing more accurate indicators for the investigation on the asphalt supramolecules.Supramolecular analysis of asphalt has proposed feasible methods and established favorable connections with asphalt properties,giving a new view of understanding asphalt microstructure and a new approach to capture mechanical behaviors of asphalt. 展开更多
关键词 Road engineering Asphalt microstructure SUPRAMOLECULE Intermolecular interaction PERFORMANCE
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基于自由体积理论的沥青分子模型黏度预测 被引量:6
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作者 唐伯明 丁勇杰 +3 位作者 苏玥 曹雪娟 邓梅 单柏林 《科学通报》 EI CAS CSCD 北大核心 2020年第30期3308-3317,共10页
沥青的黏度特性由化学结构决定.然而,目前在分子层面上对沥青动态黏度机理的认识并不清晰.本文采用分子动力学(molecular dynamic,MD)模拟,从自由体积的角度研究了沥青的黏度.基于一定范德瓦耳斯(van der Waals,vdW)半径下的自由体积预... 沥青的黏度特性由化学结构决定.然而,目前在分子层面上对沥青动态黏度机理的认识并不清晰.本文采用分子动力学(molecular dynamic,MD)模拟,从自由体积的角度研究了沥青的黏度.基于一定范德瓦耳斯(van der Waals,vdW)半径下的自由体积预测,计算得到了沥青模型黏度与温度之间的关系.结果表明,沥青的动态黏度与自由体积有关;沥青模型的自由体积随vdW半径、沥青模型类型等参数变化,随vdW半径的减小而增大;单组分模型的自由体积明显大于多组分模型.利用不同半径的自由体积对沥青的动态黏度进行了预测,当vdW半径为1.39?时计算出来的自由体积预测的沥青模型黏度平均偏差最低.此外,不同沥青模型的平均偏差不同,四组分模型的平均偏差最小.黏度测试结论与模拟结果吻合较好,说明MD结果是可靠的.本文有助于理解沥青黏度的微观机理及其与分子结构间的关系. 展开更多
关键词 分子动力学 沥青 动态黏度 自由体积 径向分布函数
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New innovations in pavement materials and engineering:A review on pavement engineering research 2021 被引量:15
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作者 JTTE Editorial Office Jiaqi Chen +41 位作者 Hancheng Dan yongjie ding Yangming Gao Meng Guo Shuaicheng Guo Bingye Han Bin Hong Yue Hou Chichun Hu Jing Hu Ju Huyan Jiwang Jiang Wei Jiang Cheng Li Pengfei Liu Yu Liu Zhuangzhuang Liu Guoyang Lu Jian Ouyang Xin Qu Dongya Ren Chao Wang Chaohui Wang Dawei Wang Di Wang Hainian Wang Haopeng Wang Yue Xiao Chao Xing Huining Xu Yu Yan Xu Yang Lingyun You Zhanping You Bin Yu Huayang Yu Huanan Yu Henglong Zhang Jizhe Zhang Changhong Zhou Changjun Zhou Xingyi Zhu 《Journal of Traffic and Transportation Engineering(English Edition)》 EI CSCD 2021年第6期815-999,共185页
Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global so... Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global social economy.New theories,new methods,new technologies and new materials related to pavement engineering are emerging.Deterioration of pavement infrastructure is a typical multi-physics problem.Because of actual coupled behaviors of traffic and environmental conditions,predictions of pavement service life become more and more complicated and require a deep knowledge of pavement material analysis.In order to summarize the current and determine the future research of pavement engineering,Journal of Traffic and Transportation Engineering(English Edition)has launched a review paper on the topic of"New innovations in pavement materials and engineering:A review on pavement engineering research 2021".Based on the joint-effort of 43 scholars from 24 well-known universities in highway engineering,this review paper systematically analyzes the research status and future development direction of 5 major fields of pavement engineering in the world.The content includes asphalt binder performance and modeling,mixture performance and modeling of pavement materials,multi-scale mechanics,green and sustainable pavement,and intelligent pavement.Overall,this review paper is able to provide references and insights for researchers and engineers in the field of pavement engineering. 展开更多
关键词 Asphalt binder Asphalt mixture Modeling of pavement materials Multi-scale mechanics Green and sustainable pavement Intelligent pavement
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Study on the influence of skid resistance on traffic safety of highway with a high ratio of bridges and tunnels 被引量:1
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作者 yongjie ding Danni Li +2 位作者 Mingxuan Huang Xuejuan Cao Boming Tang 《Transportation Safety and Environment》 EI 2021年第4期91-99,共9页
The safety of highways with a high ratio of bridges and tunnels is related to multiple factors,for example,the skid resistance of the pavement surface.In this study,the distribution of accidents under different condit... The safety of highways with a high ratio of bridges and tunnels is related to multiple factors,for example,the skid resistance of the pavement surface.In this study,the distribution of accidents under different conditions was calculated to investigate the relationship between the road skid resistance and the incidence of traffic accidents based on the traffic accident data of the Yuxiang highway.Statistical results show that weather conditions and road alignment may affect traffic accidents.The correlation analysis method was used to study the relationship between three factors and traffic accidents.The results show that road alignment,weather conditions and road skid resistance are related to the incidence of traffic accidents.The traffic accident prediction models were established based on back propagation neural network to verify the correlation analysis results.It is confirmed that road alignment,weather conditions and road skid resistance are the factors that affect traffic accidents. 展开更多
关键词 traffic accident highway in mountainous area high bridge and tunnel ratio skid resistance BP neural network
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