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The Contribution of Mesoscale Convective Systems to Intense Hourly Precipitation Events during the Warm Seasons over Central East China

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Advances in Atmospheric Sciences 2016年第11期33卷 1233-1239页

作者： Zhiwei HE Qinghong ZHANG jun sun Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University National Meteorological Center China Meteorological Administration

Central East China is an area where both intense hourly precipitation（IHP） events and mesoscale convection systems（MCSs） occur frequently in the warm seasons. Based on mosaics of composite Doppler radar reflectivity and hourly precipitation data during the warm seasons（May to September） from 1 July 2007 to 30 june 2011, the contribution of MCSs to IHP events exceeding 20 mm h^-1 over central East China was evaluated. An MCS was defined as a continuous or quasicontinuous band of 40d BZ reflectivity that extended for at least 100 km in at least one direction and lasted for at least 3h. It was found that the contribution of MCSs to IHP events was 45% on average over central East China. The largest contribution,more than 80%, was observed along the lower reaches of the Yellow River and in the Yangtze River–Huaihe River *** regions were the source regions of MCSs, or along the frequent tracks of MCSs. There were two daily peaks in the numbers of IHP events： one in the late afternoon and one in the early morning. These peaks were more pronounced in July than in other months. MCSs contributed more to the early-morning IHP event peaks than to the late-afternoon peaks. The contributions of MCSs to IHP events with different intensities exhibited no significant difference, which fluctuated around 50% on average over central East China.

关键词： afternoon morning reflectivity Precipitation contributions Yangtze convection mesoscale Events exceeding

Zircon U–Pb dating and whole-rock elemental geochemistry of the Shazi anatase deposit in Qinglong,Western Guizhou,SW China

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Acta Geochimica 2017年第2期36卷 329-338页

作者： jun sun Zhao Jingyu Aiguo Nie College of Resource and Environment Engineering Guizhou University College of Resource and Environment Engineering Guizhou Institute of Technology Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior Institute of GeochemistryChinese Academy of Sciences

The Shazi deposit is a large-scale anatase deposit in Qinglong, Guizhou Province. Zircon grains from this deposit yielded a zircon U–Pb age of *259 Ma, representing the formation age of the deposit's parent *** age is identical to the eruption age of the Emeishan large igneous province, indicating a synchronous magmatic event. The rare-earth-element patterns of laterite samples were similar to those of the weathered basalt sample, and sub-parallel to those of the Emeishan high-Ti basalts,implying a genetic relationship between the laterite and the basalt. The Chemical Index of Alteration values of laterite ranged from 96 to 98, suggesting a high degree of weathering. SiO_2, MgO, and alkaline metal elements decreased with increasing degree of weathering, while Al_2O_3, Fe_2O_3,and TiO_2 increased. We found the highest TiO_2 in laterite and the lowest in pillow basalts, indicating that Ti migrated from basalt to *** U–Pb dating and whole-rock elemental geochemistry analyses suggest that the Emeishan basalt is the parent rock of the Shazi anatase ore *** on our analysis, we propose a metallogenic model to explain the ore-forming process, in which the karst terrain formed by the Emeishan mantle plume and the subsequent basaltic magma eruption were the key factors in the formation the Shazi anatase ore deposit.

关键词： Anatase deposit Zircon U-Pb - Emeishan basalt Karst terrain

The Second Type Singularities of Symplectic and Lagrangian Mean Curvature Flows

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Chinese Annals of Mathematics,Series B 2011年第2期32卷 223-240页

作者： Xiaoli HAN Jiayu LI jun sun Department of Mathematical Sciences Tsinghua University Beijing 100084 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

This paper mainly deals with the type II singularities of the mean curvature flow from a symplectic surface or from an almost calibrated Lagrangian surface in a K¨ahler *** relation between the maximum of the Kahler angle and the maximum of |H|2 on the limit flow is *** authors also show the nonexistence of type II blow-up flow of a symplectic mean curvature flow which is normal flat or of an almost calibrated Lagrangian mean curvature flow which is flat.

关键词： Symplectic surface Lagrangian surface Mean curvature flow

Kuroshio intrusion drives the Trichodesmium assemblage and shapes the phytoplankton community during spring in the East China Sea

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Journal of Oceanology and Limnology 2021年第2期39卷 536-549页

作者： Jiaqi YUE Md Abu NOMAN jun sun Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and TechnologyTianjin 300457China Research Centre for Indian Ocean Ecosystem Tianjin University of Science and TechnologyTianjin 300457China

To understand the influence of Kuroshio intrusion on the phytoplankton community,a field investigation was conducted in spring 2017 in the East China Sea(ECS),and 130 seawater samples were collected and *** comprised the highest cell abundance contributing about 66%of the total phytoplankton followed by diatoms(17%)and dinoflagellates(16%).The dominance of the Kuroshio Waters(KW)and the Taiwan Warm Currents(TWC)were higher than the Coastal Waters(CW).The vertical distribution of physicochemical parameters depicted the intrusion of KW at the bottom layer,but it failed to reach the surface as strong upwelling was not ***,the dissolved inorganic phosphate(DIP)concentrations and P/N ratios were the lowest in the CW and the upper water layers,which limited the diatom growth in this ***,the dinoflagellates cell abundance was also lower except in the surface and CW,though they comprised the maximum richness of species among the phytoplankton ***,the unique characteristics such as diazotrophy and gas vacuoles of Trichodesmium made the situation advantageous,and they comprised the maximum cell abundance in this area especially in KW and the ***,DIP and P/N ratios appeared to be the major environmental drivers for Trichodesmium proliferation in the ECS during the study period.

关键词： Kuroshio waters phytoplankton Trichodesmium community shift

In Situ Liquid Cell Transmission Electron Microscopy Observations of Growth and Anticorrosion Behaviors of AuCl3 Shell on Au Nanobipyramids

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Chinese Journal of Chemistry 2024年第22期42卷 2757-2764页

作者： Wei Wei jun sun Songtao Zhang Litao sun Feng Xu School of Information Technology Jiangsu Open UniversityNanjingJiangsu 210036China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjingJiangsu 210096China Testing Center Yangzhou UniversityYangzhouJiangsu 225009China

Comprehensive Summary Designing new materials and architectures to maintain activity and stability requires a better understanding on the anticorrosion dynamics of ***-coordinated atoms on the surface of nanoparticles can be protected by deposited ***-time observation on how protective shells grow and play a role is challenging but ***,protective effects of AuCl_(3) shells on Au nanobipyramids(NBPs)are studied in HAuCl_(4) aqueous solutions by in-situ liquid cell transmission electron microscopy(LCTEM).This study is the first to observe the formation of Au-AuCl_(3) core-shell nanostructure and the corresponding anticorrosion behaviors of AuCl_(3) deposited *** presence of CTAB can substantially influence the growth mode and structure of AuCl_(3) shell,by a direct or indirect way,intervene the dissolution of Au *** growth or dissolution kinetics here revealed at the nanoscale provide insights towards engineering of the surface anticorrosion to pursue Au nanoparticles with improved stability in acidic environment.

关键词： In situ liquid cell TEM Au-AuCl core-shell Growth process Anticorrosion behavior I Nanotechnology Synthesis design Crystalstructure

Rigidity Results on Lagrangian and Symplectic Translating Solitons

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Communications in Mathematics and Statistics 2015年第1期3卷 63-68页

作者： jun sun School of Mathematics and Statistics Wuhan UniversityWuhan 430072People’s Republic of China

In this short note,we prove that an almost calibrated Lagrangian translating solitonmust be a plane if it has weighted integrablemean curvature vector or weighted quadratic area *** results are also true for symplecti... 详细信息

关键词： Rigidity Translating soliton Almost calibrated Lagrangian Symplectic

AI-boosted software automation:learning from human pair programmers

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Science China(Information Sciences) 2019年第10期62卷 50-52页

作者： Xin PENG Zhenchang XING jun sun School of Computer Science Fudan University Shanghai Key Laboratory of Data Science Fudan University Research School of Computer Science Australian National University School of Information Systems Singapore Management University

Dear editor,Software automation [1] aims to automatically generate computer programs from formal or informal requirement descriptions. It covers a variety of transformations of different spans, including generating programs from natural-language requirements, requirements specifications, or design specifications. Traditionally software automation is achieved through logical reasoning and rule-based transformation [1]. Although the transformation

关键词： AI-boosted software automation:learning from human pair programmers API pro

Positive psychological intervention for anxiety, depression and coping in subjects addicted to online games

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World Journal of Clinical Cases 2021年第14期9卷 3287-3293页

作者： Xiu-jun Gao Ji-jun sun Mei Xiang Department of Psychiatry Hangzhou Seventh People’s HospitalHangzhou 310013Zhejiang ProvinceChina Department of Elderly Psychiatry Hangzhou Seventh People’s HospitalHangzhou 310013Zhejiang ProvinceChina

BACKGROUND Addiction to online games is not *** patients usually refuse to take medications and present with affective symptoms such as anxiety,depression and negative coping *** intervention based on positive psychology is a promising treatment for such *** To evaluate the effect of positive psychological intervention on anxiety,depression and coping in people addicted to online *** This self-controlled study included 89 people addicted to online games,who received treatment at Hangzhou Seventh People’s Hospital,Hangzhou,China in *** Hamilton Anxiety Scale,Hamilton Depression Scale and Trait Coping Style Questionnaire were administered to evaluate the anxiety,depression and coping style among these *** intervention based on positive psychology was provided for 6 wk followed by another *** results were compared against those from the previous *** After 6 wk of psychological intervention,89 people achieved a significant improvement in the Hamilton Anxiety Scale and Hamilton Depression Scale-24 *** score for positive coping style in Trait Coping Style Questionnaire was significantly improved,while that of the negative coping style decreased significantly(P<0.05).CONCLUSION Psychological intervention based on positive psychology alleviated affective symptoms,such as anxiety and depression,in subjects addicted to online *** intervention corrected negative coping style,thereby improving mental health.

关键词： Online game addiction Positive psychology Anxiety Depression Coping style Psychological intervention

Deformation mechanisms, microstructural evolution and mechanical properties in small-scaled face-centered-cubic metallic thin films

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Nano Materials Science 2020年第1期2卷 58-65页

作者： Jinyu Zhang Gang Liu jun sun State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an710049China

Metallic thin films have attracted much attention owing to their unique mechanical properties,which are widely used in micro-/*** this review,several key topics about the thin films in the micron to nano-scales are ***,the plastic deformation mechanisms in face-centered-cubic(FCC)metals,in particular the sizedependent deformation twinning at small scales,are discussed based on a deformation-mechanism *** evolution is then briefly discussed from the perspective of the ratio of effective-to-internal stresses,while the stress-driven grain growth is discussed based on a twinning-mediated *** last section elucidates the size-dependent mechanical properties of metallic thin films,such as yield strength,ductility and mechanical fatigue behavior.

关键词： Thin films Deformation mechanisms Microstructural stability Mechanical properties Size effects