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Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

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Plasma Science and Technology 2019年第5期21卷 102-112页

作者： jing li Heping li Department of Engineering Physics Tsinghua University

Cold atmospheric plasma(CAP)jet has wide applications in various fields including advanced materials synthesis and modifications,biomedicine,environmental protection and energy saving,*** control on the volume,temperature and chemically reactive species concentratio ns of the CAP jet is of great importance in actual *** this paper,an radio-frequency atmospheric-pressure glow discharge(RF-APGD)plasma generator with a hybrid cross-linear-field electrode configuration is *** experimental results show that,with the aid of the copper mesh located at the downstream of the traditional co-axial-type plasma generator with a cross-field electrode configuration,a linear field between the inner powered electrode of the traditional plasma generator and the copper mesh can be *** linerfield can,to some extent,enhance the discharges at the upstream of the copper mesh,resulting in small increments(all less than 12.5%)of the species emission intensities,electron excitation temperatures and gas temperatures by keeping other parameters being *** due to the intrinsic transparent and conducting features of the grounded copper mesh to the gas flowing,electric current and heat flux of the plasma plumes,a plasma region with higher concentrations of chemically reactive species and larger plasma plume diameters is obtained at the downstream of the grounded copper mesh on the same level of the gas temperature and electron excitation temperature compared to those of the plasma free *** addition,the charged particle number densities at the same downstream axial location of the grounded copper mesh decrease significantly compared to those of the plasma free *** means that the copper mesh is also,to some extent,helpful for separating the chemically reactive neutral species from the charged particles in side a plasma *** preceding results indicate that the cross-linear-field electrode configuration of the plasma generator

关键词： cold atmospheric plasma hybrid-cross-linear-field electrode configuration grounded copper mesh plasma jet characteristics modulation

Frequent central Pacific La Nina events may accelerate Arctic warming since the 1980s

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Acta Oceanologica Sinica 2021年第11期40卷 62-69页

作者： jing li lin Mu linhao Zhong College of life Sciences and Oceanography Shenzhen UniversityShenzhen 518060China College of Marine Science and Technology China University of GeosciencesWuhan 430074China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Including significant warming trend,Arctic climate changes also exhibit strong interannual variations in various fields,which is suggested to be related to El Nino and Southern Oscillation(ENSO)*** studies have demonstrated the different impacts on the Arctic of central Pacific(CP)and eastern Pacific(EP)ENSO events,and suggested these impacts are largely of opposite sign for ENSO warm and cold *** results illustrate asymmetrical changes for the cold and warm ENSO events,especially for the La Nina *** to the past frequent basin-wide cooling La Nina events,since the 1980 s the cooling center for the La Nina event has strengthened and moved westward along with the increasing frequency for the canonical and CP La Nina *** to the basin-wide cooling and canonical La Nina events,the frequent CP La Nina events induce significant warming from the Beaufort Sea to Greenland via the convection center moving northward over the western *** analysis and numerical experiments both suggest that the changes in La Nina type may also accelerate Arctic warming.

关键词： ENSO diversity La Nina type the Arctic warming

The molecular mechanism of plasma membrane H^(+)-ATPases in plant responses to abiotic stress

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Journal of Genetics and Genomics 2022年第8期49卷 715-725页

作者： jing li Yan Guo Yongqing Yang Beijing Advanced Innovation Center for Tree Breeding by Molecular Design College of Bioscience and Resources EnvironmentBeijing University of AgricultureBeijing 102206China State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China

Plasma membrane H^(+)-ATPases(PM H^(+)-ATPases)are critical proton pumps that export protons from the cytoplasm to the *** resulting proton gradient and difference in electrical potential energize various secondary active transport *** H^(+)-ATPases play essential roles in plant growth,development,and stress *** this review,we focus on recent studies of the mechanism of PM H^(+)-ATPases in response to abiotic stresses in plants,such as salt and high pH,temperature,drought,light,macronutrient deficiency,acidic soil and aluminum stress,as well as heavy metal ***,we discuss remaining outstanding questions about how PM H^(+)-ATPases contribute to abiotic stress responses.

关键词： PM H^(+)-ATPases Abiotic stress Molecular mechanism

Bio-inspired barnacle cement coating of biodegradable magnesium alloy for cerebrovascular application

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Rare Metals 2024年第10期43卷 5164-5185页

作者： Hang li Fei Wang Xiao-jing Sun liu-Jie Qi jing-An li Mujahid Iqbal Shao-Kang Guan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450000China Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou UniversityZhengzhou 450000China Department of Physics University of Agriculture FaisalabadFaisalabad 38000Pakistan

Ischemic stroke is increasing worldwide,and stent intervention has gradually become one of the effective *** to its good mechanical properties and biocompatibility,biodegradable Mg-Zn-Y-Nd alloy(ZE21B)has good application prospects in vascular ***,too fast degradation and delayed endothelialization are the bottleneck problem to limit its further *** this study,the bio-inspired coating barnacle cement cp19k is constructed on ZE21B surface through electrostatic spraying to improve the corrosion resistance and pro-endothelialization *** coating was evaluated through electrochemistry,static immersion corrosion,in vitro blood experiments and cell ***19k effectively improved the corrosion resistance of the substrate ZE21B,reduced the degradation rate,improved endothelial cell proliferation and migration capabilities,inhibited smooth muscle cells proliferation and regulated contractile phenotype,inhibited macrophage adhesion,regulated macrophage M2 phenotype,and reduced the expression of inflammatory factor of TNF-a and inhibited fibroplasia in *** data indicated that the barnacle cement cp19k coating had potential application on the surface modification of Mg alloy cerebrovascular stent.

关键词： Cerebrovascular stent Biodegradable magnesium alloy Barnacle cement cp19k Proendothelialization M2 phenotype

Development of high-strength magnesium alloys with excellent ignition-proof performance based on the oxidation and ignition mechanisms: A review

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Journal of Magnesium and Alloys 2023年第1期11卷 1-14页

作者： jing Ni li Jin Jian Zeng jing li Fulin Wang Fenghua Wang Shuai Dong Jie Dong National Engineering Research Center of light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

High reactivity and ease of ignition are the major obstacles for the application of Mg alloys in ***,the ignition mechanisms of Mg alloys should be investigated systematically,which can guide the ignition-proof alloy *** article concludes the factors influencing the ignition resistance of Mg alloys from oxide film and substrate microstructure,and also the mechanisms of alloying elements improving the ignition *** low strength is another reason restricting the development of Mg ***,at the last section,Mg alloys with the combination of high strength and good ignition-proof performance are summarized,including Mg-Al-Ca based alloys,SEN(Mg-Al-Zn-Ca-Y)alloys as well as Mg-Y and Mg-Gd based ***,the shortages and the future focus of theses alloys are also *** aim of this article is to promote the understanding of oxidation and ignition mechanisms of Mg alloys and to provide reference for the development of Mg alloys with high strength and excellent ignition-proof performance at the same time.

关键词： High-strength and ignition-proof Mg alloys High temperature oxidation Oxide film Second phases Alloying

Water modeling of molten steel flow in a multi-strand tundish with gas blowing

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 143-148页

作者： jing Jiang jing-she li Hua-jie Wu Shu-feng Yang Tao li Hai-yan Tang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

Fluid flow characteristics in a four-strand tundish with gas blowing were studied by water modeling *** is found that gas blowing can greatly improve the flow characteristics in the tundish with a turbulence *** dramatically increases the peak concentration time,and greatly decreases the dead volume,and reduces the minimum residence *** gas blowing location,gas flow rate,and porous plug area greatly influence the flow characteristics in the tundish; the gas blowing location near the baffle,smaller gas flow rate,and smaller porous plug area are better for improving the fluid flow *** gas blowing can reduce the difference of flows at the middle outlets and side outlets for the multi-strand *** produced by gas blowing can absorb small inclusions and provide the condition for inclusion collision and ***,introducing gas blowing into a tundish and combining the turbulence inhibitor can improve inclusion floating and removal,and the cleanness of molten steel can be advanced.

关键词： continuous casting tundish water modeling gas blowing porous plug

A hybrid method of solving near-zone composite eletromagnetic scattering from targets and underlying rough surface

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Chinese Physics B 2020年第2期29卷 282-287页

作者： Xi-Min li jing-jing li Qian Gao Peng-Cheng Gao Air Force Engineering University Xi'an 710051China Air Force Communication NCO Academy Dalian 116199China Science and Technology on Electromagnetic Scattering Laboratory Shanghai 200438China

For composite electromagnetic(EM)scattering from rough surface and target above it in near-field condition,modified shooting and bouncing ray(SBR)method and integral equation method(IEM),which are analytic methods combined with two-scale model for rough surface,are proposed to solve the composite near-field scattering *** the modified method is verified in effectiveness and accuracy by comparing the simulation results with measured ***,the composite near-fielding scattering characteristics of a slanted plane and rough water surface below are obtained by using the proposed methods,and the dynamic tendency of composite scattering characteristics versus near-fielding distance is analyzed,which may have practical contribution to engineering programs in need of radar targets near-field characteristics under extra-low-altitude conditions.

关键词： near-field scattering rough surface target in extra-low-altitude shooting and bouncing ray(SBR)

The Change of Orientation Relationships Between Austenite and α'-Martensite During Deformation in High Manganese TRIP Steel

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 289-294页

作者： Hai-Yan Yang jing li Ping Yang School of Materials Science and Engineering University of Science and Technology Beijing

In situ observation of electron backscattering diffraction technique was used to evaluate the orientation relationships between austenite and α′-martensite（α′-M） for high manganese transformation-induced plasticity *** was noted that different from the thermal martensite,which well obeyed K-S relationship with austenite,the orientation relationship between deformation-induced α′-M with austenite changed during deformation,namely K-S and N-W relations *** clear differences existed between α′-M variants with two kinds of relationships in terms of martensitic orientation,shape and the misorientation between α′-M *** this phenomenon happened in almost all austenitic grains with different orientations investigated in this *** atom displacement mechanism through conjugate complex slips of partial dislocations in the distorted fcc lattice was applied in this article to interpret the coexistence of K-S and N-W relationships.

关键词： In situ observation Orientation relationship Electron backscattered diffraction technique(EBSD) Martensitic transformation High manganese TRIP steel

Development and application of a multi-graphite electrode DC plasma tundish heating

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Journal of Iron and Steel Research International 2022年第11期29卷 1800-1806页

作者： Yong Wang Cun Wang Meng-jing Zhao jing-xin Song Shu-feng Yang jing-she li School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Aobang Advanced Materials Co. Ltd.Beijing 101400China Meishan I&S Co.of Baowu Group Nanjing 210039JiangsuChina

The world’s first three-graphite electrode direct current(DC)plasma heating system(2500 kW)was successfully put into production on the 50-t tundish of a two-strand slab *** single metallic torch plasma tundish heaters were *** addition,the induction heating system was also *** three-graphite electrode DC plasma tundish heating(PTH)system does not require any electrode to be fitted to the *** electrodes can be used to realize uniform and fast heating of the six-strand *** with high power can effectively eliminate the steep temperature drop of the molten steel in the tundish during ladle *** system has turned out to be very reliable,simple,and *** heating rate is high within 0.5 to 2.0℃/*** heats with ultra-low superheat(2.6-11.0℃)were observed,and the molten steels were successfully cast by the powerful heating capacity and good control performance of the system in the practical *** can be concluded that continuous casting with superheat of 5-10℃in the tundish was fully realistic with PTH.

关键词： Plasma tundish heating Superheat Center segregation Graphite electrode