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The sources and transport of iron in the North Paci?c and its impact on marine ecosystems

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Atmospheric and Oceanic Science Letters 2019年第1期12卷 30-34页

作者： WANG Yuntao ZHANG Haoran CHEN Huanhuan chai fei State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography College of Oceanography Hohai University School of Marine Sciences University of Maine

The limitation of iron(Fe)makes the North Pacific a typically high-nitrate,low-chlorophyll(HNLC)region in comparison with other oceanic regions of the *** inputs from land via river discharge and atmospheric dust deposition are the primary processes introducing Fe into the ***,subsequent physical processes are crucial in transporting biologically available Fe into the upper *** anthropogenic dust increases,the Fe from anthropogenic activities is expected to become more important in terms of impacting marine *** investigate the Fe cycle and its impact on ecosystems,a project entitled‘The sources and transport of Fe in the North Pacific and its impact on marine ecosystems’has been funded by the National Natural Science Foundation of *** project will focus on three major scientific questions:(1)What are the major sources of Fe in the North Pacific?(2)What is the influence of the Fe-binding ligand cycle on marine ecosystems?(3)What is the likely influence of global change in the future?The distribution of Fe and its corresponding impact on the marine ecosystem in current and future environmental conditions will be *** results of the project are expected to improve our understanding of the marine ecosystem in the North Pacific.

关键词： North Pacific iron cycle dust global change marine ecosystem

Complex Wave Excitations in Generalized Broer-Kaup System

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Communications in Theoretical Physics 2007年第4X期48卷 657-661页

作者： ZHENG Chun-Long fei jin-Xi College of Mathematics and Physics Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

Starting from an improved projective method and a linear variable separation approach, new families of variable separation solutions （including solltary wave solutlons, periodic wave solutions and rational function solutions） with arbitrary functions [or the （2＋ 1）-dimensional general/zed Broer-Kaup （GBK） system are derived. Usually, in terms of solitary wave solutions and/or rational function solutions, one can find abundant important localized excitations. However, based on the derived periodic wave solution in this paper, we reveal some complex wave excitations in the （2＋1）-dimensional GBK system, which describe solitons moving on a periodic wave background. Some interesting evolutional properties for these solitary waves propagating on the periodic wave bactground are also briefly discussed.

关键词： improved projective method GBK system exact solution complex wave excitation

Microstructures and mechanical properties of WE43 magnesium alloy prepared by friction stir processing

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Rare Metals 2020年第11期39卷 1267-1272页

作者： jin Li Da-Tong Zhang Fang chai Wen Zhang National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou510640China

Mg-3.99Y-3.81Nd-0.53 Zr(WE43)casting alloy was subjected to single-pass friction stir processing(FSP)at a constant processing speed of 60 mm-min^(-1)and various rotation speeds of 400,800,1200,and 1500 r·min^(-1),and microstructures and mechanical properties of the experimental materials were *** results in the generation of fine-grained microstructure,and fundamental breakage and dissolution of the coarse second *** the rotation speeds increasing,the average grain size of the FSP specimen in the stir zone first decreases and then increases,and the finest microstructure(~2μm)was prepared at the rotation speed of 800 r·min^(-1).Owing to the finer and more uniform microstructure,the mechanical properties of WE43 alloy after FSP are significantly *** variation tendency of the tensile properties is consistent with the change of the grain *** maximum tensile strength,elongation,and average microhardness of the FSP WE43 alloy obtained at 800 r·min^(-1)are 290 MPa,17.2%,and HV92.9,*** fracture morphology shows that small dimples can be observed on the FSP specimens,while the as-cast alloy fails through cleavage fracture.

关键词： WE43 magnesium alloy Friction stir processing Microstructure mechanical property Rare earth elements

Boundary Regularity of Isometries Between Infinitely Flat Complex Domains

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1375-1387页

作者： jin Song LIU fei TAO Hong Yu WANG Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190P.R.China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049P.R.China Beijing International Center for Mathematical Research Peking UniversityBeijing 100871P.R.China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876P.R.China Key Laboratory of Mathematics and Information Networks(Beijing University of Posts and Telecommunications) Ministry of EducationBeijing 100876P.R.China

In this paper we prove that isometries with respect to the Kobayashi metric between certain domains having boundary points at which the boundary is infinitely flat extend continuously to the *** strategy is to reestab... 详细信息

关键词： Boundary extension Kobayashi metric isometries

Pollution characteristics and health risk assessment of polycyclic aromatic hydrocarbons and nitrated polycyclic aromatic hydrocarbons during heating season in Beijing

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Journal of Environmental Sciences 2023年第1期123卷 169-182页

作者： Xurong Bai Jie Wei Yanqin Ren Rui Gao Fahe chai Hong Li fei Xu Yuxue Kong State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Shandong University Environment Research InstituteQingdao 266237China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Polycyclic aromatic hydrocarbons(PAHs)and their nitrated derivatives(NPAHs)attract continuous attention due to their outstanding carcinogenicity and *** order to investigate the diurnal variations,sources,formation mechanism,and health risk assessment of them in heating season,particulate matter(PM)were collected in Beijing urban area from December 26,2017 to January 17,*** and NPAHs in PM were quantitatively analyzed via gas chromatography-mass spectrometry(GC-MS).Average daily concentrations of PAHs and NPAHs were(78±54)ng/m^(3)and(783±684)pg/m^(3),*** concentrations of them were significantly higher at nighttime than at daytime,and NPAHs concentrations were 1-2 orders of magnitude lower than PAHs *** the heating season,the dominant species of PAHs include benzo[b]fluoranthene,fluoranthene,pyrene,and chrysene,while 9-nitroanthracene,2+3-nitrofluoranthene,and 2-nitropyrene were dominant species for *** were found to have a single peak during heating and to be primarily distributed in the 0.4-0.7μm particle *** emissions such as biomass burning,coal combustion,and traffic emissions were the major sources of *** were produced by the primary source of vehicle emissions and the secondary reaction triggered by OH radicals,as well as biomass burning during *** to the health risk assessment,the total carcinogenic risk was higher in adults than in *** upon oral ingestion,the carcinogenic risk in children was higher than that of adults,but the risk of adults was higher than children through skin contact and respiratory inhalation.

关键词： Heating season Polycyclic aromatic hydrocarbons Nitrated polycyclic aromatic hydrocarbons Pollution characteristics Source Health risk assessment

Dry ball milling and wet ball milling for fabricating copper-yttria composites

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Rare Metals 2018年第10期37卷 859-867页

作者： fei Huang Hang Wang jin-Shui Chen Bin Yang School of Materials Science and Engineering Jiangxi University of Science and Technology Ganzhou 341000 China Editorial Office Nonferrous Metals of Science and EngineeringJiangxi University of Science and Technology Ganzhou 341000China Institute of Engineering Research Jiangxi University of Scienceand Technology Ganzhou 341000 China

Yttria-reinforced copper matrix composites were prepared by dry ball milling （DBM） and wet ball milling （WBM）, respectively, followed by spark plasma sintering （SPS）. It is to determine which milling process is better for fabricating Cu-Y2O3 composites. It is found that Cu-Y2O3 composites synthesized by DBM exhibit better densification, mechanical and electrical properties than those by WBM. Less agglomeration of reinforcements in the bulk composites by DBM is responsible for the better perfor- mances. To further understand the reason of less agglomeration of Y2O3 in the bulks by DBM, morphologies of prepared powders were investigated and analyzed. Higher ball＇s impact energy and the formation of copper oxide on the matrix surface during DBM process contribute to small matrix particles, which is beneficial for less agglomeration.

关键词： Cu-Y2O3 composites Dry ball milling Wet ball milling Spark plasma sintering Morphology

Anti-inflammatory effects of Abelmoschus manihot(L.)*** LPS-induced cystitis in mice:potential candidate for cystitis treatment based on classic use

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Chinese Journal of Natural Medicines 2022年第5期20卷 321-331页

作者： ZHOU Su FAN Kai-Kai GU Li-fei YU Bo-Yang chai Cheng-Zhi Jiangsu Key Laboratory of TCM Evaluation and Translational Research School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 211198China Research Center for Traceability and Standardization of TCMs School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 211198China

Abelmoschus manihot(L.)Medik.(***)is a traditional Chinese herbal medicine with a variety of pharmacological *** was first recorded in Jiayou Materia Medica dating back to the Song dynasty to eliminate urinary tract irritation by clearing away heat and diuretic ***,its pharmacological action on urinary tract infections has not been *** present study aims to evaluate the anti-inflammatory activity of *** on a mouse model of lipopolysaccharide(LPS)-induced *** results showed that *** decreased white blood cell(WBC)count in urine sediments of the cystitis mice,alleviated bladder congestion,edema,as well as histopathological damage,reduced the expression levels of tumor necrosis factor-α,interleukin-6,and interleukin-1β***,*** administration significantly downregulated the expression levels of TLR4,MYD88,IκBα,p-IκBα,NF-κB p65,and p-NF-κB p65 in LPS-induced cystitis *** findings demonstrated the protective effect of *** against LPS-induced cystitis,which is attributed to its anti-inflammatory profile by suppressing TLR4/MYD88/NF-κB *** results suggest that *** could be a potential candidate for cystitis treatment.

关键词： Abelmoschus manihot(L.)Medik.(A.manihot) Cystitis Lipopolysaccharide(LPS) Inflammation TLR4/MYD88/NF-κB

Screening of immune cell activators from Astragali Radix using a comprehensive two-dimensional NK-92MI cell membrane chromatography/C18 column/time-of-flight mass spectrometry system

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Journal of Pharmaceutical Analysis 2022年第5期12卷 725-732页

作者： Xinyi chai Yanqiu Gu Lei Lv Chun Chen fei Feng Yan Cao Yue Liu Zhenyu Zhu Zhanying Hong Yifeng chai Xiaofei Chen School of Pharmacy Shanghai Key Laboratory for Pharmaceutical Metabolite ResearchNaval Medical University(Second Military Medical University)Shanghai 200433China Department of Pharmacy Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai201999China Department of Pharmacy Shanghai Eastern Hepatobiliary Surgery HospitalNaval Medical University(Second Military Medical University)Shanghai200438China

Astragali Radix(AR)is a clinically used herbal medicine with multiple immunomodulatory activities that can strengthen the activity and cytotoxicity of natural killer(NK)***,owing to the complexity of its composition,the specific active ingredients in AR that act on NK cells are not clear *** membrane chromatography(CMC)is mainly used to screen the active ingredients in a complex system of herbal *** this study,a new comprehensive two-dimensional(2D)NK-92MI CMC/C18 column/time-of-flight mass spectrometry(TOFMS)system was established to screen for potential NK cell *** obtain a higher column efficiency,3-mercaptopropyltrimethoxysilane-modified silica was synthesized to prepare the NK-92MI CMC *** total,nine components in AR were screened from this system,which could be washed out from the NK-92MI/CMC column after 10 min,and they showed good affinity for NK-92MI/CMC *** representative active compounds of AR,isoastragaloside Ⅰ and astragaloside IV,promoted the killing effect of NK cells on K562 cells in a dose-dependent *** can thus suggest that isoastragaloside Ⅰ and astragaloside Ⅳ are the main immunomodulatory components of *** comprehensive 2D NK-92MI CMC analytical system is a practical method for screening immune cell activators from other herbal medicines with immunomodulatory effects.

关键词： NK cell activators Cell membrane chromatography Immunomodulatory herbal medicine Covalent bonding

Toward deeper development of Biogeochemical-Argo floats

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Atmospheric and Oceanic Science Letters 2018年第3期11卷 287-290页

作者： XING Xiao-Gang CLAUSTRE Hervé BOSS Emmanuel chai fei Second Institute of Oceanography State Oceanic AdministrationHangzhouChina Laboratoire d'Océanographie de Villefranche Sorbonne UniversitésVillefranche-sur-MerFrance School of Marine Sciences University of MaineOronoMEUSA

The Biogeochemical-Argo （BGC-Argo） Program aims at operating a network of profiling floats equipped with sensors of key biogeochemical variables for support- ing research activities that address impacts of climate c... 详细信息

关键词： BiogeochemicaI-Argo Argo project marine biogeochemistry phytoplankton dissolved oxygen nitrate pH particle