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| 1 | Trace bis-(3-sulfopropyl)-disulfide enhanced electrodeposited copper foils显示文摘Smooth and strong copper foils are highly required for the development of printed circuit boards and Li-ion batteries.Adding additives is an efficient and low-cost method to enhance electrodeposited copper foils.Here we chose Bis-(3-sulfopropyl)-disulfide(SPS)as the additive and investigated its concentration on the surface roughness and tensile strength of the electrodeposited copper foils.A copper foil with the smoothest surface(Rz=2.1μm)and the highest tensile strength(~338 MPa)was prepared with1.5 mg/L SPS.The contact angle on the copper foil decreased with the reduction of surface roughness.The enhancing mechanism of the SPS was investigated by scanning electron microscopy and X-ray diffraction.The refined grain and enhanced(220)texture were considered to be the radical reason for the smooth and strong copper foils.The electrochemical results prove the suppressing effect is related to the SPS adsorption. | Lingling Liu Yeqiang Bu Yue Sun Jianfeng Pan Jiabin Liu Jien Ma Lin Qiu Youtong Fang | 2021 | Journal of Materials Science & Technology2021，，15： | 6 |
| 2 | COMPUTATIONAL FLOW RATE FEEDBACK AND CONTROL METHOD IN HYDRAULIC ELEVATORS显示文摘The computational flow rate feedback and control method, which can be used in proportional valve controlled hydraulic elevators, is discussed and analyzed. In a hydraulic elevator with this method, microprocessor receives pressure information from the pressure transducers and computes the flow rate through the proportional valve based on pressure-flow conversion real time algorithm. This hydraulic elevator is of lower cost and energy consumption than the conventional closed loop control hydraulic elevator whose flow rate is measured by a flow meter. Experiments are carried out on a test rig which could simulate the load of hydraulic elevator. According to the experiment results, the means to modify the pressure-flow conversion algorithm are pointed out. | Xu Bing Ma Jien Lin Jianjie | 2005 | Chinese Journal of Mechanical Engineering2005，18，4： | 5 |
| 3 | The optimization of valve plate cross angle based on the pumping dynamics mode显示文摘 | Ma Jien Fang Youtong Xu Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 4 | Optimization of Cross Angle Based on the Pumping Dynamics Model 显示文摘 | MA Jien FANG Youtong XU Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 5 | 基于预测电流控制的CIT400高速综合检测列车运行特性仿真分析方法显示文摘基于CIT400高速综合检测列车牵引传动系统的结构和牵引特性,运用MATLAB/Simulink软件建立预测电流控制下的高速综合检测列车牵引传动系统仿真模型,仿真分析列车在牵引和制动工况下受电弓短时断电及网压波动时的运行特性,并与实测数据进行对比分析。研究表明:仿真结果与实测数据基本一致,建立的仿真模型能正确反映列车的运行特性,能够满足列车实际运行的动静态要求。 | Fang, Youtong Liu, Li Ma, Jien Pei, Chunxing | 2012 | 中国铁道科学2012，，4： | 0 |
| 6 | Message from Editors显示文摘CONTROLLING carbon emissions to achieve green and sustainable development has become a global consensus and general trend.China established“30.60”decarbonization goal for carbon peak and carbon neutrality in 2019.As electromechanical energy conversion devices,the electrical machines and systems play important roles in both renewable energy harvesting,such as wind,tidal,ocean current energy。 | Lijian Wu Kai Wang Dawei Li Cungang Hu Junquan Chen Xiao Liu Shi Jin Wei Wang Feng Niu Hui Yang Xiaoqin Zheng Jien Ma | 2022 | CES Transactions on Electrical Machines and Systems2022，6，4： | 0 |
| 7 | High-speed railway transport technology显示文摘1 Introduction The high-speed railway is one of the most active technological fields in China.Since the opening of the high-speed line between Beijing and Tianjin in 2008,China has built the world’s largest high-speed railway network with the highest average operating speed in the world(Bian et al.,2019;Cao et al.,2021;Chen et al.,2022).China has also created the world’s largest,most advanced,and comprehensive scientific research system and industrial chain in the field of high-speed railways.Currently,China’s high-speed railway oper‐ating mileage,the total number of research personnel related to high-speed railways,and the total research investment in them,all exceed the sum of those of all other countries. | Youtong FANG Jien MA | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 8 | Recent advances in traction drive technology for rail transit显示文摘The traction drive system is the“heart”of rail transit vehicles.The development of sustainable,secure,economic,reliable,efficient,and comfortable contemporary rail transportation has led to increasingly stringent requirements for traction drive systems.The interest in such systems is constantly growing,supported by advancements such as permanent magnet(PM)motors,advanced electronic devices such as those using silicon carbide(SiC),new-generation insulating materials such as organic silicon,and advanced magnetic materials such as rare-earth magnets and amorphous materials.Progress has also been made in control methods,manufacturing technology,artificial intelligence(AI),and other advanced technologies.In this paper,we briefly review the state-of-the-art critical global trends in rail transit traction drive technology in recent years.Potential areas for research and the main obstacles hindering the development of the next-generation rail transit traction drive systems are also discussed.Finally,we describe some advanced traction drive technologies used in actual engineering applications. | Jien MA Chao LUO Lin QIU Xing LIU Bowen XU Jiabo SHOU Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 9 | Progress in research on nanoprecipitates in high-strength conductive copper alloys: a review显示文摘High-strength conductive Cu alloys play an essential role in high-speed railways,5G networks,and power transmission.The compound precipitates of alloying elements such as Cr,Zr,Fe,and Si in Cu alloys significantly regulate the microstructure and properties of these alloys.They can ensure that the alloys have high strength without damaging conductivity seriously,which is usually a difficult problem in the development of Cu alloys.This paper systematically expounds on the microstructure and concerned factors of compound precipitates in high-strength conductive Cu alloys such as Cu-Cr-Zr,Cu-Zr,Cu-Ni-Si,and Cu-Fe-P.In particular,factors affecting the precipitates are summarized from the perspectives of composition and process to guide the regulation of properties.Some new,promising,high-performance Cu alloys,including Cu-Co-Si,Cu-Co-Ti,and Cu-Fe-Ti,are described.Finally,we look at the research prospects for precipitation-strengthened Cu alloys. | Jian YU Feng ZHAO Huiya YANG Jiabin LIU Jien MA Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 10 | An overview of bearing voltages and currents in rail transportation traction motors显示文摘In modern rail transportation,inverter drive systems have been extensively used due to their excellent speed control capabilities.However,in recent years,premature failure problems caused by bearing voltage and current phenomena have been frequently reported in electric motors,with electrical bearing failures making up a considerable percentage.The purpose of this review is to provide a comprehensive overview of facets relating to the electrical erosion of bearings in an electrical environment represented by railway vehicles.First,the origins of the phenomenon as well as typical bearing electrical failure modes are discussed.Next,we introduce the distinctive features of the electrical environment of railway traction motor bearings,including output voltages with high common-mode components and systems with complex grounding configurations.Then,we classify the fundamental mechanisms for generating bearing voltages/currents into four groups,and present their modeling processes,including equivalent circuit establishment and parameter determination methods.Furthermore,we summarize the strategies frequently used to protect bearings,and describe a typical solution to suppress electrical bearing failures in railway vehicles.Finally,we present a case example to illustrate a research procedure for systematic investigation of inverter-induced bearing currents in rail transportation. | Yao LI Lin QIU Yongjian ZHI Zifan GAO Jien MA Jian ZHANG Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
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