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IEEE International Conference on Plasma Science (ICOPS)

作者： S. Wu X. Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei P R. China

Summary form only given. Atmospheric pressure non-equilibrium plasma jets (APNP-Js) generate plasmas in open space rather than in confined discharge gaps and are promising for applications in materials processing, nanotechnology, and plasma medicine. High-speed photographs have shown that the plasma plumes are in fact composed of bullet-like plasma volumes travelling at speeds of 10 4 -10 5 m/s. It is now generally agreed that the plasma bullets are similar to cathode-directed streamers 1 . For the propagation of cathode-directed streamers, free electrons ahead of the streamer front are needed; Photo-ionization is one of the key mechanisms to produce these free electrons. The existing theoretical models suggest possible critical roles of the local electric field induced by space charges, as well as photo-ionization and residual electron effects. However, we are not aware of experimental reports on the effect of photo-ionization on the plasma bullet *** critical factor that affects APNP-Js is the density of residual electrons left from previous repetitive discharges. The density of these electrons could be much higher compared to the seed electrons produced by natural radioactivity; this makes it even more difficult to quantify the contribution of photo-ionization. However, no investigations into the APNP-J ignition phase are presently available, especially to verify the common assumption that the residual electron density within the streamer propagation channel is high. In this work, complementary experiments and numerical modeling reveal the important role of photo-ionization in the propagation of plasma bullets. It is shown that the minimum electron concentration ~108 cm-3 is required for the regular, repeated propagation of the plasma bullets, while the streamers propagate in the stochastic mode below this threshold. The stochastic-to-regular mode transition is related to the higher background electron density in front of the propagating bullets.

关键词： Plasmas Discharges (electric) Nanotechnology Ionization electromagnetics Space exploration Materials processing

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The comparison of the Wnt signaling pathway inhibitor delivered electrospun nanoyarn fabricated with two methods for the application of urethroplasty

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Frontiers of Materials Science 2016年第4期10卷 346-357页

作者： Xuran GUO Kaile ZHANG Mohamed EL-AASSAR Nanping WANG Hany EL-HAMSHARY Mohamed EL-NEWEHY Qiang FU Xiumei MO State Key Lab for Modification of Chemical Fibers & Polymer Materials College of Chemistry & Chemical Engineering and Biotechnology Donghua University Shanghai 201620 China Department of Urology Affiliated Sixth People's Hospital Shanghai Jiaotong University Shanghai 200030 China Polymer Materials Research Department Advanced Technology and New Material Institute City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21934 Egypt Shanghai Aquatic Product Research Institute Shanghai 200030 China Department of Chemistry College of Science King Saud University Riyadh i 1451 Saudi Arabia Department of Chemistry Faculty of Science Tanta University Tanta 31527 Egypt Shandong International Biotechnology Park Development Co. Ltd. Shanghai 200030 China

Urethral strictures were common disease caused by over-expression of extracellular matrix from fibroblast. In this study, we compare two nanoyarn scaffolds for improving fibroblasts infiltration without inhibition the over-expression of extracellular matrix. Collagenlpoly（L-lactide-co-caprolactone）（ColIP（LLA-CL）） nanoyarn scaffolds were prepared by conjugated electrospinning and dynamic liquid electrospinning, respectively, in addition, co-axial electrospinning technique was combined with the nanoyarn fabrication process to produce nanoyarn scaffolds loading Wntsignaling pathway inhibitor. The mechanical properties of the scaffolds were examined and morphology was observed by SEM. Cell morphology, proliferation and infiltration on the scaffolds were investigated by SEM, MTT assay and H＆E staining, respectively. The release profiles of different scaffolds were determined using HPLC. The results indicated that cells showed an organized morphology along the nanoyarns and considerable infiltration into the nanoyarn scaffolds prepared by dynamic liquid electrospinning （DLY）. It was also observed that the DLY significantly facilitate cell proliferation. The D-DLY could facilitate the infiltration of the fibroblasts and could be a promising scaffold for the treatment of urethra stricture while it may inhibit the collagen production.

关键词： biomaterials nanoyarn electrospinning inhibitor

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Cover Feature: Ultrasensitive, Sustainable, and Selective Electrochemical Hydrazine Detection by ALD-Developed Two-Dimensional WO3(ChemElectroChem 2/2018)

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ChemElectroChem 2017年第2期5卷

作者： Zihan Wei Zhenyin Hai Mohammad Karbalaei Akbari Prof. Jie Hu Lachlan Hyde Prof. Stephen Depuydt Prof. Francis Verpoort Prof. Serge Zhuiykov Ghent University Global Campus Department of Applied Analytical & Physical Chemistry 119 Songdomunhwa-ro Yeonsu-gu Incheon South Korea Micro and Nano System Research Center Key Lab of Advanced Transducers and Intelligent Control System (Ministry of Education) & College of Information Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi PR China Factory of the Future Swinburne University of Technology Hawthorn Australia National Research Tomsk Polytechnic University Lenin Avenue 30 634050 Tomsk Russian Federation Laboratory of Organometallics Catalysis and Ordered Materials State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Chemical and Material Engineering Wuhan University of Technology Wuhan P.R. China

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Stretchable Electronics: In‐Plane Deformation Mechanics for Highly Stretchable Electronics (Adv. Mater. 8/2017)

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advanced Materials 2017年第8期29卷

作者： Yewang Su Xuecheng Ping Ki Jun Yu Jung Woo Lee Jonathan A. Fan Bo Wang Ming Li Rui Li Daniel V. Harburg YongAn Huang Cunjiang Yu Shimin Mao Jaehoun Shim Qinglin Yang Pei‐Yin Lee Agne Armonas Ki‐Joong Choi Yichen Yang Ungyu Paik Tammy Chang Thomas J. Dawidczyk Yonggang Huang Shuodao Wang John A. Rogers State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Department of Civil and Environmental Engineering and Department of Mechanical Engineering Northwestern University Evanston IL 60208 USA School of Engineering Science University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China School of Mechanical Engineering Tianjin University of Science & Technology Tianjin 300222 China Frederick Seitz Materials Research Laboratory Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Champaign IL 61820 USA Department of Material Science and Engineering Department of Energy Engineering Hanyang University Seoul 133‐791 South Korea Department of Electrical Engineering Stanford University Stanford CA 94305 USA School of Mechanical and Aerospace Engineering Oklahoma State University Stillwater OK 74078 USA State Key Lab Digital Manufacturing Equipment and Technology and Flexible Electronics Research Center Huazhong University of Science and Technology Wuhan Hubei 430074 China Department of Mechanical Engineering University of Houston Houston TX 77204 USA Department of Electrical and Computer Engineering and the Department of Chemistry Beckman Institute for Advanced Science and Technology University of Illinois at Urbana‐Champaign Champaign Urbana IL 61820 USA

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Stress Analysis and Bobbin Structure Optimization Design of a 35kV HTS-controllable Reactor

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Physics Procedia 2015年 65卷 278-281页

作者： Z. Wang L. Ren S. Shen M. Song Y. Zhang H. Liu L. Chen B. Yu N. Hu State Key Lab of Advanced Electromagnetic Engineering and Technology (R&D Center of Applied Superconductivity Huazhong University of Science and Technology) 1037 Luoyu Road Wuhan 430074 P. R. China

A 35kV high temperature superconducting controllable reactor (HTS-CR) is under development and the electromagnetic design has been completed. Due to the AC conditions, the thermal stress caused by AC losses can be so strong that the stress analysis should be carried out to verify that the maximum stress under different operating conditions is in appropriate range. In addition, Lorentz force of HTS windings will impact the bobbin structure of the HTS windings which will endanger the 35 kV HTS-CR. Stress analysis is important for the design of a mechanically stable structure. This paper provides the analysis of the bobbin structure and its result of optimization design considering the requirements of safety and cooling.

关键词： thermal stress analysis bobbin structure optimization design

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electromagnetic interaction between local surface plasmon polaritons and an atmospheric surface wave plasma jet

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Chinese Physics B 2014年第3期23卷 404-411页

作者：陈兆权胡东刘明海夏广庆郑晓亮胡业林叶秋波陈明功祝龙记胡希伟 College of Electrical & Information Engineering Anhui University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

We analyze the electromagnetic interaction between local surface plasmon polaritons （SPPs） and an atmospheric surface wave plasma jet （ASWPJ） in combination with our designed discharge device. Before discharge, the excitation of the SPPs and the spatial distribution of the enhanced electric field are analyzed. During discharge, the critical breakdown electric field of the gases at atmospheric gas pressure and the surface wave of the SPPs converted into electron plasma waves at resonant points are studied. After discharge, the ionization development process of the ASWPJ is simulated using a two- dimensional fluid model. Our results suggest that the local enhanced electric field of SPPs is merely the precondition of gas breakdown, and the key mechanism in maintaining the discharge development of a low-power ASWPJ is the wave-mode conversion of the local enhanced electric field at the resonant point.

关键词： surface wave plasma surface plasmon polaritons numerical simulation electromagnetic interac-tion

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Characteristics of phase current and its application in fault section location in noneffectively grounded distribution systems

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Sensors and Transducers 2014年第2期165卷 176-181页

作者： Tang, Jinrui Yin, Xianggen Zhang, Zhe State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

Medium voltage distribution systems of some countries are mostly noneffectively grounded systems, and most of the distribution automation systems do not have the function of locating the fault section for single phase-to-ground fault. This paper presents a method of fault section location based on the characteristic of the phase current difference. It makes a deep analysis based on instantaneous symmetrical component method when single phase-to-ground fault happens. This method requires only a little data to be transferred and does not need voltage information, so it is easy to be popularized and applied in engineering practice. The effectiveness of the method has been verified by the PSCAD/EMTDC simulation results. © 2014 IFSA Publishing, S. L.

关键词： Location

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Traveling-wave-based fault-location method under low sampling rate

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Energy Education Science and technology Part A: Energy Science and Research 2014年第1期32卷 213-220页

作者： Tang, Jinrui Yin, Xianggen Zhang, Zhe State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology 430074 Wuhan China

This paper proposes a correction algorithm for traditional wave-front arrival time identification method based on wavelet transform maxima modulus under low sampling rate. It is disclosed that wave-front positioning accuracy under low sampling rate can be improved when the wavelet transform coefficients related to the two points which are nearest to the sampling point corresponding to the wavelet transform maxima modulus are used. The effectiveness and practicability of the extraction method of zero-mode velocity have been verified by PSCAD/EMTDC simulation results. © Sila Science. All rights reserved.

关键词： Wavelet transforms

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Single pulse studies of the electrical discharge machining of metal matrix composite materials

Single pulse studies of the electrical discharge machining o...

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作者： Liu, J.W. Yue, T.M. Guo, Z.N. Zhang, Y.J. State Key Lab of Pulp and Paper Engineering South China University of Technology Guangzhou510640 China Advanced Manufacturing Technology Research Centre Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Hong Kong Faculty of Electromechanical Engineering Guangdong University of Technology Guangzhou510090 China

The main objective of this investigation is to study the influence of the processing medium and gap distance on the electrical discharge machining process performance while machining metal matrix composite materials. Machining characteristic of electrical discharge machining in air and emulsified oil medium has been compared. The effects of medium, gap distance on the crater size have been studied. The study shows that the discharge modes in both of the medium are all in the form of an arc. And it was also found that the material removal rate of EDM in emulsified oil was considerable higher (about 300%) than that in air medium under the experimental conditions of this study. Moreover, in both air and emulsified oil medium, more molten materials can be flushed out if the gap distance has been enlarged. © W. S. Maney & Son Ltd 2015.

关键词： Electric discharges

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A 30 mm Wide DC-Driven Brush-Shaped Cold Air Plasma Without Airflow Supplement

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Plasma Science and technology 2014年第4期16卷 329-334页

作者：陈兆权郑晓亮夏广庆李平胡业林杜志文祝龙记刘明海陈明功胡希伟 College of Electrical&Information Engineering Anhui University of Science and Technology State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current （DC） power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications.

关键词： atmospheric pressure plasma cold plasma plume DC-driven discharge airplasma

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