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Variability of Antarctic Intermediate Water south of Australia and its relationship with frontal waves

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Science China Earth Sciences 2016年第8期59卷 1674-1682页

作者： ZHANG LinLin yan xiaomei SUN Che HU DunXin Institute of Oceanology Chinese Academy of Sciences Key Laboratory of Ocean Circulation and Waves Chinese Academy of Sciences Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and Technology

A streamfunction EOF method is applied to a time series of hydrographic sections in the Southern Ocean south of Australia to study water mass variations. Results show that there are large thermohaline variations north of the Subantarctic Front (SAF) at 300–1500 dbar level, indicating upwelling and downwelling of the Antarctic Intermediate Water (AAIW) along isopycnal surfaces. Based on the latest altimeter product, Absolute Dynamic Topography, a mechanism due to frontal wave propagation is proposed to explain this phenomenon, and an index for frontal waves is defined. When the frontal wave is in positive (negative) phase, the SAF flows northeastward (southeastward) with the fresh AAIW downwelling (upwelling). Such mesoscale processes greatly enhance cross-frontal exchanges of water masses. Spectral analysis shows that frontal waves in the Southern Ocean south of Australia are dominated by a period of about 130 days with a phase speed of 4 cm/s and a wavelength of 450 km.

关键词： Antarctic Intermediate Water(AAIW) Stream-coordinates Frontalwave EOF

A new aggregation-induced emission-based fluorescent probe for effective detection of Hg^(2+)and its multiple applications

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Chinese Chemical Letters 2023年第12期34卷 466-469页

作者： Yongxin Pan Yuetian Guo Ying Li Lijun Tang xiaomei yan College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China Department of Chemistry National Demonstration Center for Experimental Chemistry EducationYanbian UniversityYanji 133002China College of Laboratory Medicine Dalian Medical UniversityDalian 116044China

Detection of mercury ions(Hg^(2+))in actual samples is of significant importance due to the toxicity of Hg^(2+)to human *** this work,a simple tetraphenylethene(TPE)derived fluorescent probe TPE-Hg based on aggregation-induced emission(AIE)mechanism was ***-Hg can visually recognize Hg^(2+)in THF/HEPES(1:9,v/v,HEPES 20 mmol/L,pH 7.3)system with rapid response,strong anti-interference ability,large Stokes shift(203 nm),and low detection limit(7.548×10^(-7)mol/L).The results show that Hg^(2+)triggered elimination of TPE-Hg lead to releasing of an AIE-active compound 2 is responsible to the sensing ***-Hg is applicable to detect Hg^(2+)in actual water samples and image Hg^(2+)in living MCF-7 *** addition,TPE-Hg is suitable to assay the Hg^(2+)level in seafood and tea samples,and it is alsoapplicable intest strips.

关键词： Aggregation-induced emission Fluorescent probe Food samples Cell imaging Hg(Ⅱ)

High-resolution crustal velocity structure in the Shanxi rift zone and its tectonic implications

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Science China Earth Sciences 2021年第5期64卷 728-743页

作者： Liting DOU Huajian YAO Lihua FANG Song LUO Meiqin SONG xiaomei yan Cheng CHENG Shanxi Earthquake Administration Taiyuan 030021China Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaMengcheng 233500China CAS Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

The Shanxi rift zone,located in the Trans-North China Orogen(TNCO)of the North China Craton(NCC),is wellknown for hosting large intraplate earthquakes in continental *** TNCO is a suture zone formed by the amalgamation of the eastern and the western blocks of the *** its formation,it was reactived and deformed by later tectonic activities,which result in complex lithospheric ***,the detailed crustal structure of the Shanxi rift zone is critical for understanding the tectonics and seismogenic mechanism in this area,which will shed new lights on the formation and dynamic evolution of the *** this study,we applied ambient noise tomography based on 18 months continuous records from 108 seismic stations located in Shanxi and its surroundings,in order to constrain its detailed crustal *** measured 4437 Rayleigh wave phase velocity dispersion curves in the period of 5–45 s from the cross-correlation ***,a surface wave direct inversion algorithm based on surface-wave ray tracing was used to resolve a 3-D S-wave velocity model in the upper 60 km with lateral resolution of~50–80 *** tomographic images show that the sedimentary thickness of the Taiyuan Basin is less than 5 *** depth of 0–10 km,we observe a good correlation between the imaged structural variations with geological and topographic features at the *** example,the center of rift shows low-velocity anomalies and the uplifting areas on both sides are characterized by high velocity *** western and eastern boundaries of the slow materials coincide with the faults that control the *** slow material extends from the shallow surface to depth of about 15 km but it getting smaller in shape at deeper *** the Taiyuan Basin,Linfen Basin,and Yuncheng Basin in the central and southern parts,the structure is dominant by slow materials in the upper crust but changes to strong high-velocity anomalies in the lower crust and the uppermost mantle at

关键词： Shanxi rift zone Ambient noise tomography S-wave velocity structure Magmatic underplating Earthquake distribution

The near-inertial waves observed east of the Philippines

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Journal of Oceanology and Limnology 2022年第5期40卷 1889-1908页

作者： Shengming YUAN xiaomei yan Linlin ZHANG Bing yanG Chongguang PANG Dunxin HU Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China

Based on mooring observations from Aug.1,2016 to Dec.14,2017,the characteristics and underlying mechanisms of near-inertial waves(NIWs)observed east of the Philippines were *** strong NIW events were investigated in *** NIWs in EventⅠwere induced by typhoon Lan and had the strongest magnitudes of 0.35 m/*** maximum near-inertial kinetic energy(NIKE)was shown at the ocean *** NIW in EventⅡwas stimulated by a moderate cyclonic wind with the extreme NIKE located at about 110-m *** existence of a cyclonic eddy during EventsⅠandⅡled to a blue shift of near-inertial *** EventⅢ,the surface near-inertial signals were also induced by local weak wind,whereas the real generation mechanisms for the subsurface NIWs remain *** particular,during EventⅢ,there was a nonlinear wave-wave interaction between NIWs and semidiurnal(D)tides,which further induced strong D±f ***,the NIWs in the three events exhibited distinct vertical *** NIWs in EventsⅠandⅡwere dominated by lower mode s with elevated NIKE well confined to the upper 250 m and 270 m,*** contrast,the NIW EventⅢwas dominated by higher modes and the NIWs penetrated downward beyond 360 *** deep penetration of NIWs could be attributed to the weak wind stress curl and positive sea level anomalies associated with an anticyclonic *** addition,the three NIW events had e-folding timescales of less than 7 days.

关键词： near-inertial wave(NIW) generation mechanism dynamic characteristic

Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis

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Acta Oceanologica Sinica 2019年第11期38卷 1-10页

作者： Min Wang Zhaojun Liu Xiaohua Zhu xiaomei yan Zhongzhe Zhang Ruixiang Zhao School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China College of Marine Science and Environment Dalian Ocean UniversityDalian 116023China

The origin of the Ryukyu Current(RC)and the formation of its subsurface velocity core were investigated using a 23-year(1993–2015)global Hybrid Coordinate Ocean Model(HYCOM)*** volume transport of the RC comes from the Kuroshio eastward branch(KEB)east of Taiwan and part of the North Pacific Subtropical Gyre(p-NPSG).From the surface to 2000m depth,the KEB(p-NPSG)transport contributes 41.5%(58.5%)to the mean total RC *** KEB originally forms the subsurface velocity core of the RC east of Taiwan due to blockage of the subsurface Kuroshio by the Ilan Ridge(sill depth:700 m).Above 700m,the Kuroshio can enter the East China Sea(ECS)over the Ilan Ridge,meanwhile,the blocked Kuroshio below 700m turns to the right and flows along the Ryukyu *** the RC flowing northeastward,the p-NPSG contribution strengthens the subsurface maximum structure of the RC owing to the blockage of the Ryukyu *** the surface layer,the p-NPSG cannot form a stable northeastward current due to frequent disturbance by mesoscale eddies and water exchange through the gaps(with net volume transport into ECS)between the Ryukyu Islands.

关键词： origins of Ryukyu Current subsurface velocity core volume transport Kuroshio HYCOM

Modified projective synchronization of fractional-order chaotic systems based on active sliding mode control

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Modified projective synchronization of fractional-order chao...

Moderate heat treatment of CoFe Prussian blue analogues for enhanced oxygen evolution reaction performance

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作者： xiaomei yan Qi Du Ting Shang Faculty of Automation and Information Engineering Xi'an University of Technology School of Business Xi'an University of Finance and Economy

ISBN: (纸本)9781467355339

For modified projective synchronization of fractional-order chaotic systems, this paper presents an active sliding mode control method. Based on the stability theorem of fractional-order system, stability of the error system is analyzed. Two examples of modified projective synchronization are performed respectively, which include two identical fractional-order systems （Lü-Lü） and two different fractional-order systems （Lü-Liu）. Numerical simulations illustrate the effectiveness of the proposed method.

关键词： modified projective synchronization fractional-order chaotic system sliding mode control

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Journal of Energy Chemistry 2023年第3期78卷 476-486,I0013页

作者： Fangyuan Diao Mikkel Rykær Kraglund Huili Cao xiaomei yan Pei Liu Christian Engelbrekt Xinxin Xiao Department of Chemistry Technical University of DenmarkKongens Lyngby DK-2800Denmark Department of Energy Storage and Conversion Technical University of DenmarkKongens Lyngby DK-2800Denmark DTU Nanolab-National Centre for Nano Fabrication and Characterization Technical University of DenmarkKongens Lyngby DK-2800Denmark Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark

Prussian blue analogues(PBAs) with inherent ordered structures and abundant metal ion sites are widely explored as precursors for various electrochemical applications,including oxygen evolution reaction(OER).Using a range of characterization techniques including Fourier-transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD) and energy dispersive spectroscopy(EDS),this work discloses the process of replacement of K^(+)by NH4^(+)in the interstitial spaces of the CoFe PBA by a hot aqueous urea solution,which influences the transformation of PBAs under further heat treatment and the OER performance of the deriva *** heat treatment at 400℃ under Ar flow,high-resolution transmission electron microscopy(HRTEM) images reveal that CoFe alloy nanoparticles grew on the crystalline cubes of CoFe PBA with K^(+),while CoFe PBA cubes with NH4^(+)become ***,the derivative of CoFe PBA with NH4^(+)(Ar-U-CoFe PBA) performs better than the derivative of CoFe PBA with K^(+)(Ar-CoFe PBA) in OER,registering a lower overpotential of 305 mV at 10 mA cm^(-2),a smaller Tafel slope of 36.1 mV dec^(-1),and better stability over a testing course of 20 h in 1.0 M KOH.A single-cell alkaline electrolyzer,using Ar-U-CoFe PBA and Pt/C for the anodic and cathodic catalyst,respectively,requires an initial cell voltage of 1.66 V to achieve 100 mA cm^(-2)at 80℃,with negligible degradation after100 h.

关键词： Prussian blue analogues PBA derivatives Oxygen evolution reaction Electrolyzer

Characterization of lipid-based nanomedicines at the single-particle level

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Fundamental Research 2023年第4期3卷 488-504页

作者： Chaoxiang Chen Chen Chen Yurou Li Ruilan Gu xiaomei yan Department of Chemical Biology MOE Key Laboratory of Spectrochemical Analysis&InstrumentationKey Laboratory for Chemical Biology of Fujian ProvinceCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China Department of Biological Engineering College of Ocean Food and Biological EngineeringJimei UniversityXiamenFujian 361021China

Lipid-based nanomedicines(LBNMs),including liposomes,lipid nanoparticles(LNPs)and extracellular vesicles(EVs),are recognized as one of the most clinically acceptable ***,the bench-to-bedside translation efficiency is far from satisfactory,mainly due to the lack of in-depth understanding of their physical and biochemical attributes at the single-particle *** this review,we first give a brief introduction of LBNMs,highlighting some milestones and related scientific and clinical achievements in the past several decades,as well as the grand challenges in the characterization of ***,we present an overview of each category of LB-NMs as well as the core properties that largely dictate their biological characteristics and clinical performance,such as size distribution,particle concentration,morphology,drug encapsulation and surface ***,the recent applications of several analytical techniques including electron microscopy,atomic force microscopy,fluorescence microscopy,Raman microscopy,nanoparticle tracking analysis,tunable resistive pulse sensing and flow cytometry on the single-particle characterization of LBNMs are thoroughly ***,the com-parative advantages of the newly developed nano-flow cytometry that enables quantitative analysis of both the physical and biochemical characteristics of LBNMs smaller than 40 nm with high throughput and statistical ro-bustness are *** overall aim of this review article is to illustrate the importance,challenges and achievements associated with single-particle characterization of LBNMs.

关键词： Lipid-based nanomedicines Liposomes Lipid nanoparticles Extracellular vesicles Single-particle analysis Nano-flow cytometry Drug encapsulation Surface modification

Designing polyoxometalate-based metal-organic framework for oxidation of styrene and cycloaddition of CO_(2) with epoxides

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Chinese Chemical Letters 2023年第7期34卷 409-413页

作者： xiaomei yan Jiangbo Xu Ting Zhang Chen Si Jiachen Jiao Jie Li Qiuxia Han Henan Key Laboratory of Polyoxometalate Chemistry School of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China School of Chemistry&Chemical Engineering Zhoukou Normal UniversityZhoukou 466001China

A photoactive polyoxometalate-based metal-organic framework (POMOF),NiW-DPNDI,was synthesized by combination of Ni(Ⅱ) ions,[ZnW_(12)O_(40)]^(6–)anions,and N,N’-bis(4-pyridylmethyl)naphthalene diimide(DPNDI) molecules into one single *** W-DPNDI displays a three-dimensional structure by the strong anion···π interactions between the trapped[ZnW_(12)O_(40)]^(6–)anions and the electron-deficient naphthalenic ring centroids and theπ-πstacking interactions between DPNDI *** W-DPNDI displayed a highly efficient hole-electron separation and ordered electron transfer under irradiation,thus ensuing its excellent photocatalysis in oxidation of styrene to produce *** addition,it gave a high efficiency for styrene oxide under thermocatalytic *** the carbonic anhydrase (CA)-mimicking Ni sites and the negative electron-enriched[ZnW_(12)O_(40)]^(6–)anions are well aligned in the pores,it can promote the cycloaddition of CO_(2) with epoxides under mild conditions.

关键词： Polyoxometalate Metal-organic framework Photocatalysis Oxidation of styrene Cycloaddition