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| 1 | Pantograph-catenary electrical contact system of high-speed railways:recent progress,challenges,and outlooks显示文摘As the unique power entrance,the pantograph-catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train.Along with the fast development of high-speed railways all over the world,some commercialized lines are built for covering the remote places under harsh environment,especially in China;these environmental elements including wind,sand,rain,thunder,ice and snow need to be considered during the design of the pantograph-catenary system.The pantograph-catenary system includes the pantograph,the contact wire and the interface—pantograph slide.As the key component,this pantograph slide plays a critical role in reliable power transmission under dynamic condition.The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity,impact resistance,wear resistance,etc.,directly determine the sliding electrical contact performance of the pantograph-catenary system;meanwhile,different detection methods of the pantograph-catenary system are crucial for the reliability of service and maintenance.In addition,the challenges brought from extreme operational conditions are discussed,taking the Sichuan-Tibet Railway currently under construction as a special example with the high-altitude climate.The outlook for developing the ultra-high-speed train equipped with the novel pantograph-catenary system which can address the harsher operational environment is also involved.This paper has provided a comprehensive review of the high-speed railway pantograph-catenary systems,including its progress,challenges,outlooks in the history and future. | Guangning Wu Keliang Dong Zhilei Xu Song Xiao Wenfu Wei Huan Chen Jie Li Zhanglin Huang Jingwei Li Guoqiang Gao Guozheng Kang Chuanjun Tu Xingyi Huang | 2022 | Railway Engineering Science2022，30，4： | 5 |
| 2 | Study on the erosion characteristics of copper-carbon electrode pairs by DC air arc显示文摘As common electric contact materials,copper-carbon electrode pairs are widely used in the field of electric contact such as in high-speed railways,motor collector rings and grounding brushes.They play a key role in energy transmission in the above-mentioned systems.Arc erosion has become a key issue threatening system safety.In this work,a dedicated arc erosion platform was built to study the polarity effect of copper-carbon electrode pairs.It was found that arc dynamics and electrodes erosion behaviours were significantly different under different polarities,which could be understood from the mechanism of heat transfer,cooling and electron emission of the electrode.Then,when the carbon material was used as an anode,the arc caused carbon transfer:the carbon material sublimated quickly due to electron condensation and thermal conduction and quickly condensed on the low-temperature metal electrode,while the carbon material transfer could partly inhibit the oxidation of the cathode metal electrode.In addition,the rapid sublimation of the carbon material produced high-temperature airflow,which would make the arc impedance fluctuate and cause the arc voltage to jump.Finally,the anode heat transfer and cathode cooling mechanism directly affected the material state,and the erosion of the anode material was more serious。 | Wenhan Xie Guangning Wu Zefeng Yang Pengpeng She Hong Wang Haozi Zuo Wenfu Wei Guoqiang Gao Chuanjun Tu | 2021 | High Voltage2021，6，4： | 1 |
| 3 | Thermal Wear and Electrical Sliding Wear Behaviors of the Polyimide Modified Polymer-Matrix Pantograph Contact Strip 显示文摘 | TU Chuanjun CHEN Zhenhua XIA Jintong | 2009 | Tribology International2009，42，6： | 1 |
| 4 | Thermal wear and electrical sliding wear behaviors of the polyimide modified polymer-matrix pantograph contact strip显示文摘 | Tu Chuanjun Chen Zhenhua Xia J intong | 2009 | Tribology Inter national2009，42，6： | 1 |
| 5 | Transition metal carbonate anodes for Li-ion battery: fundamentals,synthesis and modification显示文摘Even though transition metal carbonates(TMCs, TM = Fe, Mn, Co, Ni etc.), show high theoretical capacities, rich reserves and environmental friendliness as anodes for lithium-ion batteries(LIBs), they suffer from sluggish electronic/ionic conductivities and huge volume variation, which severely deteriorate the rate capacities and cycling performances. Understanding the intrinsic reaction mechanism and further developing ideal TMC-based anode with high specific capacity, excellent rate capabilities, and longterm cycling stability are critical for the practical application of TMCs. In this review, we firstly focus on the fundamental electrochemical energy-storage mechanisms of TMCs, in terms of conversionreaction process, pseudocapacitance-type charge storage, valence change for charge storage and catalytic conversion mechanisms. Based on the reaction mechanisms, various modification strategies to improve the electrochemical performance of TMCs are summarized, covering:(i) micro-nano structural engineering, in which the influence factors on the morphology are discussed, and multiple architectures are listed;(ii) elemental doping, in which the intrinsic mechanisms of metal/nonmetal elements doping on the electrochemical performance are deeply explored;(iii) multifunctional compositing strategies, in which the specific affections on structure, electronic conductivity and chemo-mechanical stability are summarized.Finally, the key challenges and opportunities to develop high-performance TMCs are discussed and some solutions are also proposed. This timely review sheds light on the path towards achieving cost-effective and safe LIBs with high energy density and long cycling life using TMCs-based anode materials. | Rui Zhang Qingfeng Fu Peng Gao Wang Zhou Hui Liu Chaohe Xu Jian-Fang Wu Chuanjun Tu Jilei Liu | 2022 | Journal of Energy Chemistry2022，31，7： | 1 |
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