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Meridional deflection of global eddy propagation derived from tandem altimetry: Mechanism and implication

Science China Earth Sciences 2024年第3期67卷 811-825页

作者： Ge chen xiaoyan chen Frontiers Science Center for Deep Ocean Multispheres and Earth System School of Marine TechnologyOcean University of ChinaQindao 266100China Laboratory for Regional Oceanography and Numerical Modeling Laoshan LaboratoryQindao 266237China

A common view on meridional deflection of eddy propagation is poleward for cyclones and equatorward for anticyclones. This widely accepted polarity-sensitive pattern has been increasingly undermined given that it is systematically violated on both zonal and regional scales as recently reported. Here, we approach the problem by exploring these violations in terms of eddy effects of spatiotemporal geostrophy, thermal fading, and flow dragging, yielding the following main conclusions.(1) The polarity-dependent deflection discrepancy is a pseudo feature resulting from a biased fit to the normalized eddy tracks which are spatially asymmetric(though azimuthally symmetric) between the two signs;Instead, the primary pattern of eddy deflection appears to be geographically correlated and polarity independent.(2) Geostrophic adjustment plays a critical role in defining the meridional movement of an eddy. Specifically, a consistent poleward(equatorward) trajectory bending of spatially(temporally) ageostrophic eddies is observed irrespective of their polarity.(3) The mechanism of eddy deflection is also determined by its zonal propagation direction. Westward propagating eddies are substantially affected by thermal fading, while opposite ones by flow dragging. A realistic and comprehensive understanding of eddy deflection mechanisms serves as a significant contribution to the prediction of eddy trajectory, and the protection of ocean environment.

关键词： Mesoscale eddies Eddy propagation Eddy meridional deflection Satellite observation Geostrophic adjustment

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Environmental Analysis with 2D Transition-Metal Dichalcogenide-Based Field-Effect Transistors

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Nano-Micro Letters 2020年第8期12卷 1-24页

作者： xiaoyan chen chengbin Liu Shun Mao Biomedical Multidisciplinary Innovation Research Institute Shanghai East HospitalState Key Laboratory of Pollution Control and Resource ReuseCollege of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092People’s Republic of China Department of Materials Science and Engineering Johns Hopkins University3400 N.Charles St.BaltimoreUSA

Field-effect transistors(FETs)present highly sensitive,rapid,and in situ detection capability in chemical and biological ***,two-dimensional(2D)transition-metal dichalcogenides(TMDCs)attract significant attention as FET channel due to their unique structures and outstanding *** the booming of studies on TMDC FETs,we aim to give a timely review on TMDCbased FET sensors for environmental analysis in different ***,theoretical basics on TMDC and FET sensor are ***,recent advances of TMDC FET sensor for pollutant detection in gaseous and aqueous media are,respectively,*** last,future perspectives and challenges in practical application and commercialization are given for TMDC FET *** article provides an overview on TMDC sensors for a wide variety of analytes with an emphasize on the increasing demand of advanced sensing technologies in environmental analysis.

关键词： Environmental analysis Two-dimensional transition-metal dichalcogenide Field-effect transistor Gas sensor Biosensor

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Photodegradation of xylene isomers:Kinetics,mechanism,secondary pollutant formation potential and health risk evaluation

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Journal of Environmental Sciences 2024年第2期136卷 658-669页

作者： xiaoyan chen Weikun Zhu Sufen Feng Jiangyao chen Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong Technology Research Center for Photocatalytic Technology Integration and Equipment EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Photodegradation technology has been widely applied in the purification of industrial aromatic ***,whether this technology efficiently removes the pollutants to prevent secondary pollution and health risk is still ***,the photodegradation processes of three xylenes were compared under designed reaction atmospheres and light *** lamp showed poor photodegradation ability toward xylenes,no matter in N_(2) or N_(2)+O_(2)system,while much higher photodegradation performance of xylenes were obtained under ultraviolet(UV)and vacuum ultraviolet(VUV)irradiation,especially in N_(2)+O_(2)+VUV system,where 97.9%of m-xylene,99.0%of o-xylene or 87.5%of p-xylene with the initial concentration of 860 mg/m^(3) was removed within 240 *** xylenes underwent three processes of photo-isomerization,photodecomposition and photo-oxidation to produce intermediates of aromatics,alkanes and *** them,the photo-isomerization products showed the highest concentration percentage(e.g.,≥50%in o-xylene system),confirming that photo-isomerization reaction was the dominated photodegradation process of ***,these isomerized products not only contributed about 97%and91%to the formation potential of O3(OFP)and secondary organic aerosols(SOAFP),but also displayed obvious non-carcinogenic risk,although one of photodecomposition product—benzene showed the highest occupational exposure ***,the secondary pollution and health risks of photodegradation products of xylenes were non-ignorable,although the OFP,SOAFP and health risks of the generated products reduced at least 4.5 times in comparison with that of the degraded *** findings are helpful for the appropriate application of this technology in the purification of industrial organic waste gas.

关键词： Isomer aromatics Photodegradation Ozone formation Secondary organic aerosols Health risk

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Further study on Horozov-Iliev's method of estimating the number of limit cycles

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Science China Mathematics 2022年第11期65卷 2255-2270页

作者： xiaoyan chen Maoan Han Department of Computer Science and Mathematics Changsha UniversityChangsha 410022China Department of Mathematics Zhejiang Normal UniversityJinhua 321004China

In the study of the number of limit cycles of near-Hamiltonian systems,the first order Melnikov function plays an important *** paper aims to generalize Horozov-Iliev’s method to estimate the upper bound of the numbe... 详细信息

关键词： near-Hamiltonian system piecewise smooth system Melnikov function limit cycle

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High sulfur-doped hard carbon anode from polystyrene with enhanced capacity and stability for potassium-ion storage

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Journal of Energy Chemistry 2022年第5期31卷 688-698页

作者： xiaoyan chen Xin-Bing cheng Zhigang Liu Advanced Catalytic Engineering Research Center of the Ministry of Education College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Carbonaceous materials are regarded as a promising anode material for potassium ion batteries(PIBs)due to their high electronic conductivity, abundant resources and low cost. However, relatively low storage capacity and structural instability still hinder their practical application. Herein, high sulfur-doped hard carbon(SHC-3) with a sulfur up to 27.05 at% is synthesized from polystyrene and sulfur as precursors. As an anode for PIBs, the SHC-3 delivers a superb cycling stability and rate performance(298.1 mAh g^(-1)at 100 mA g^(-1) for 1000 cycles, a capacity retention of 95.2%;220.2 mAh g^(-1)at 500 mA g^(-1) after 5200 cycles). The potassium storage of SHC-3 exhibits excellent cyclic stability at both low and high *** and kinetic studies demonstrate that the larger interlayer spacing(0.382 nm) of the SHC-3 accelerates the diffusion of potassium ions and effectively alleviates the volume expansion, and thus maintains the structure stability during the process of potassization/de-potassization. Meanwhile, the density functional theory calculation shows that the doped sulfur atoms provide abundant active sites for the adsorption of potassium ions, thereby increasing the reversible capacity of PIBs. This work provides a new scheme for the design of carbonaceous anode materials with high capacity and long cycle life.

关键词： Hard carbon materials Sulfur doping Anode Potassium-ion storage DFT calculation

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Heat Transfer Characteristics of a Microchannel Heat Sink with Highly-Dense Micro-Jet Arrays

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Journal of Thermal Science 2024年第3期33卷 1148-1160页

作者： ZHANG Yu chen xiaoyan MIAO Lin chen Liang HOU Yu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Beijing Aerospace Technology Institute Beijing100083China

This paper proposed a new structure of highly-dense micro-jet arrays for hybrid jet-impingement/microchannel heat sinks(~120 jet per cm^(2) with jet width of 0.35 mm).Parametric study is performed to investigate the influence of structure and flow parameters on the convective heat transfer of water jet cooling in confined *** simulation results show that the optimal jet width,jet spacing and impingement distance are around 0.2 mm,0.2 mm and 0.3 mm,respectively,which can achieve a low thermal resistance as well as a relatively low pressure *** analysis of the heat transfer pathways shows that the micro-fin jet structures can extend the impinging heat transfer area and conduct a considerable proportion of heat,which can reach up to 38.9%with the Reynolds number ranging from 797.1 to *** heat transfer characteristics in the heat sink will shift from impingement dominated heat transfer to the channel-convection dominated heat transfer as the jet impingement distance increases.A correlation is proposed to predict the average Nusselt number on the stagnation area for the heat sink with different structure parameters,and the deviations of predictions from the numerical results are less than 10%.

关键词： hybrid heat sink impingement microchannel thermal management high heat flux

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Reduced graphene oxide doping flower-like Fe_(7)S_(8) nanosheets for high performance potassium ion storage

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Journal of Energy Chemistry 2021年第3期30卷 604-611页

作者： Na cheng xiaoyan chen Lushuang Zhang Zhigang Liu School of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082HunanChina

Finding easy-to-operate strategy to obtain anode material with well-designed structure and excellent electrochemical performance is necessary to promote the development of the future potassium-ion batteries(PIBs).In this work,we synthesized reduced graphene oxide doping flower-like Fe_(7)S_(8) nanosheets electrode materials using one-step hydrothermal *** rGO@Fe_(7)S_(8) composite is composed of homogeneous Fe_(7)S_(8) and reduced graphene oxide thin *** unique structure not only promotes the penetration of electrolyte and increases the conductive of the pure Fe_(7)S_(8) electrode materials,but also relieves the volume expansion of K^(+) during charge/discharge *** applied this interesting anode electrode for PIBs,the rGO@Fe_(7)S_(8) exhibits excellent electrochemical *** delivers a high reversible specific capacity of 445 mAh g^(-1) at 50 mA g^(-1),excellent rate performance(284 mAhg^(-1)at 500 mA g^(-1) and 237 mAh g^(-1) at 1000 mA g^(-1)),and a high cycling stability at 100 mA g^(-1)(maintained 355 mAh g^(-1) after 300 cycles).

关键词： RGO@Fe_(7)S_(8) Doping Reduced graphene oxide Potassium ion storage Flower-like Nanosheets

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Hybridization： A Chemical Bonding Nature of Atoms

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Chinese Journal of Chemistry 2017年第9期35卷 1452-1458页

作者： Dongfeng Xue Congting Sun xiaoyan chen State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Both the bonding mode and geometry can serve as the chemical bonding nature of central cation, which is essentially determined by the atomic orbital-hybridization. In this work, we focus on the possible chemical bonding scheme of central cations on the basis of a quantitative analysis of electron domain of an atom. Starting from the hybridization of outer atomic orbitals that are occupied by valence electrons, we studied the possible orbital hybridization scheme of atoms in the periodic table and the corresponding coordination number as well as possible molecular geometries. According to distinct hybrid orbital sets, the chemical bonding of central cations can be classified into three typical types, resulting in the cations with a variety of coordination numbers ranging from 2 to 16. Owing to different hybridization modes, the highest coordination number of cations in IA and IIA groups is larger than that in IB--VIIIB groups, and the coordination number of lanthanide elements is most abundant. We also selected NaNO3, Fe（NO3）3·9H2O, Zn（NO3）2·6H2O, Y（NO3）3·3H2O, and La（NO3）3·6H2O as examples to confirm the direct relationship between chemical bonding characteristics and orbital hybrid set by IR spectra. The present study opens the door to reveal the chemical bonding nature of atoms on the basis of hybridization and will provide theoretical guides in structural design at an atomic level.

关键词： hybridization chemical bonding coordination number central cations rare earth

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An interleukin 10 Receptor alpha (IL-10RA) variant with a compound heterozygote mutation shows normal IL-10 signaling activity

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Genes & Diseases 2023年第3期10卷 716-718页

作者： Jiajia Lv xiaoyan chen Yuan Xiao Department of Pediatrics Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Department of Pathology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

Loss-of-function mutations of interleukin 10 receptor alpha subunit(IL-10RA)(homozygotes or compound heterozygotes)are associated with pediatric colitis and *** mutations always drive a significant increase in serum interleukin-10(IL-10)levels,while such high levels of IL-10 fail to suppress intestinal inflammation,at least in part by failure to suppress the release of some cytokines such as interleukin 1 beta(IL-1β)and tumor necrosis factor-alpha(TNFα).1,2 However,at present,whether a novel missense variant has a pathogenic effect is mainly determined according to the guidelines issued by the American College of Medical Genetics and Genomics(ACMG).Without functional verification,a variant of uncertain significance(VUS)will be easily made,or a variant will be misjudged as pathogenic or ***,a function test of a novel mutated IL-10RA is needed to determine whether colitis was attributed to such a mutation.

关键词： diarrhea inflammation compound

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2nd-order spline wavelet convolution method in resolving chemical overlapped peaks

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Science China Chemistry 2004年第1期47卷 50-58页

作者： WANG Ying MO Jinyuan chen xiaoyan School of Chemistry and Chemical Engineering Zhongshan University Guangzhou 510275 China School of Chemistry and Chemical Engineering Zhongshan University Guangzhou 510275 China School of Chemistry and Chemical Engineering Zhongshan University Guangzhou 510275 China

A 2nd-order spline wavelet convolution method in resolving overlapped peaks is developed. It determines the number of peaks, peak positions and width through wavelet? convolution, then uses spline function to construct the resoluter, which is used to resolve overlapped peaks. Theoretical proof is given, and the selections of wavelets and parameters are discussed. It is proven that baseline separation can be achieved after processed, the relative errors of peak position and area are less than 0.2% and 4.0% respectively. It can be directly applied to seriously overlapped signals, noisy signals and multi-component signals, and the results are satisfactory. It is a novel effective method for resolution.

关键词： 2nd-order spline wavelet, convolution, resolve, chemical signal, overlapped peaks.

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