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Science China(Technological Sciences) 2018年第11期61卷 1745-1754页

作者： shi yuxin WANG ZeZhong Beijing Key Laboratory of High Voltage & EMC North China Electric Power University

The surface electric field analysis of the converter valve shield system is a large-scale electrostatic field problem, which is difficult to analyse. The fast multipole boundary element method(FMBEM), which is suitable for solving large-scale problems,can accelerate the computation speed and conserve memory. However, the coefficient matrix implicitly formed by using the FMBEM is sometimes ill-conditioned, especially for large-scale problems; thus, the convergence of iteration is poor. In this paper, a fast solver is proposed to improve efficiency. First, an adaptive GMRES(m) with variant restart parameter is adjusted for the Galerkin FMBEM. In addition, the sparse approximate inverse preconditioner is improved, and a new sparsity pattern is proposed for the multiscale problem derived from the converter valve shield system. The numerical results show that the accuracy can meet the engineering requirements compared with the finite element method. Compared with other solvers and preconditioners, the algorithm can achieve a satisfactory convergence rate and reduce the computation time. In addition, a single bridge shield system of ±160 kV converter valve is successfully analysed using the proposed method.

关键词： converter valve electrostatic field fast multipole boundary element method (FMBEM) GMRES preconditioner

Influence of mixed layer depth on chlorophyll-a concentration in the Southern Ocean

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Acta Oceanologica Sinica 2024年第10期43卷 16-32页

作者： yuxin shi Hailong Liu Quanan Zheng School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion Yunnan UniversityKunming 600650China Department of Atmospheric and Oceanic Science University of Maryland at College ParkCollege Park 20742USA

The element iron limitation is one of the crucial factors contributing to high nutrient low chlorophyll in the Southern Ocean(SO).Mixed layer dynamics regulate the availability of iron to *** this paper,we investigate the influence of surface iron supplementation triggered by the mixed layer depth(MLD)variation on chlorophyll-a(Chl-a)concentration in the SO on seasonal and interannual *** analysis is based on the Biogeochemical Southern Ocean State Estimate for the period from 2013 to *** provide a comprehensive and systematic mapping of the regions within the SO,where Chl-a is affected by iron input related to MLD *** relationship between the MLD and the Chl-a varies with the latitude on the seasonal time *** the MLD and sea ice melting affect the distribution of *** the interannual scale,iron supply due to MLD deepening occurs primarily north of 60°*** advection-induced entrainment enhances the surface iron input during the austral summer,which favors Chl-a *** addition to the MLD,the melting of sea ice and cooling of the sea surface can also alter iron input and subsequently affect Chl-a distribution in the austral *** the austral winter,entrainment can boost iron stocks,stimulating a subsequent spring increase of Chl-a in the ***,sea surface temperature declines during the austral winter,promoting an increased iron supply and creating favorable conditions for the subsequent spring Chl-a increase in the SO.

关键词： mixed layer depth entrainment chlorophyll-a concentration Southern Ocean

Responses of the Southern Ocean mixed layer depth to the eastern and central Pacific El Niño events during austral winter

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Acta Oceanologica Sinica 2024年第7期43卷 1-14页

作者： yuxin shi Hailong Liu Xidong Wang Quanan Zheng School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion Yunnan UniversityKunming 600650China College of Oceanography Hohai UniversityNanjing 210098China Department of Atmospheric and Oceanic Science University of Maryland at College ParkCollege Park 20742USA

Based on the Ocean Reanalysis System version 5(ORAS5)and the fifth-generation reanalysis datasets derived from European Centre for Medium-Range Weather Forecasts(ERA5),we investigate the different impacts of the central Pacific(CP)El Niño and the eastern Pacific(EP)El Niño on the Southern Ocean(SO)mixed layer depth(MLD)during austral *** MLD response to the EP El Niño shows a dipole pattern in the South Pacific,namely the MLD dipole,which is the leading El Niño-induced MLD variability in the *** tropical Pacific warm sea surface temperature anomaly(SSTA)signal associated with the EP El Niño excites a Rossby wave train propagating southeastward and then enhances the Amundsen Sea low(ASL).This results in an anomalous cyclone over the Amundsen *** a result,the anomalous southerly wind to the west of this anomalous cyclone advects colder and drier air into the southeast of New Zealand,leading to surface cooling through less total surface heat flux,especially surface sensible heat(SH)flux and latent heat(LH)flux,and thus contributing to the mix layer(ML)*** east of the anomalous cyclone brings warmer and wetter air to the southwest of Chile,but the total heat flux anomaly shows no significant *** warm air promotes the sea ice melting and maintains fresh water,which strengthens *** results in a shallower *** the CP El Niño,the response of MLD shows a separate negative MLD anomaly center in the central South *** Rossby wave train triggered by the warm SSTA in the central Pacific Ocean spreads to the Amundsen Sea,which weakens the ***,the anomalous anticyclone dominates the Amundsen ***,the anomalous northerly wind to the west of anomalous anticyclone advects warmer and wetter air into the central and southern Pacific,causing surface warming through increased SH,LH,and longwave radiation flux,and thus contributing to the ML ***,to the east of the anomalous anticyclone,there is n

关键词： Southern Ocean mixed layer depth Central Pacific El Niño Eastern Pacific El Niño Rossby wave train

Unusual coastal ocean cooling in the northern South China Sea by a katabatic cold jet associated with Typhoon Mujigea(2015)

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Acta Oceanologica Sinica 2019年第5期38卷 62-75页

作者： yuxin shi Lingling Xie Quanan Zheng Shuwen Zhang Mingming Li Junyi Li Guangdong Key Laboratory of Coastal Ocean Variation and Disaster Prediction Guangdong Ocean University Department of Atmospheric and Oceanic Science University of Maryland

This study deals with a unusual cooling event after Typhoon Mujigea passed over the northern South China Sea(SCS) in October 2015. We analyze the satellite sea surface temperature(SST) time series from October 3 to 18,2015 and find that the cooling process in the coastal ocean had two different stages. The first stage occurred immediately after typhoon passage on October 3, and reached a maximum SST drop of –2℃ on October 7 as the usual cold wake after typhoon. The second stage or the unusual extended cooling event occurred after 7d of the typhoon passage, and lasted for 5d from October 10 to 15. The maximum SST cooling was –4℃ and occurred after 12d of typhoon passage. The mechanism analysis results indicate that after landing and moving northwestward to the Yunnan-Guizhou Plateau(YGP), Typhoon Mujigea(2015) met the westerly wind front on October 5. The lowpressure and positive-vorticity disturbances to the front triggered meridional air flow and low-pressure trough,thus induced a katabatic cold jet downward from the Qinghai-Tibet Plateau(QTP) passing through the YGP to the northwestern SCS. The second cooling reached the maximum SST drop 4d later after the maximum air temperature drop of –9℃ on October 11. The simultaneous air temperature and SST observations at three coastal stations reveal that it is this katabatic cold jet intrusion to lead the unusual SST cooling event.

关键词： Typhoon Mujigea(2015) second-round cooling katabatic cold jet South China Sea westerly wind front

Resistive-type sensors based on few-layer MXene and SnO_(2)hollow spheres heterojunctions:Facile synthesis,ethanol sensing performances

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Chinese Chemical Letters 2023年第8期34卷 502-507页

作者： Lihua Chu Hao Yan Wanfeng Xie yuxin shi Muhammad Hilal Changxu Sun Ze Li Meicheng Li School of New Energy North China Electric Power UniversityBeijing 102206China College of Electronics and Information University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao 266071China Department of Physics Dongguk UniversitySeoul 04620Republic of Korea

High-performance and low-cost gas sensors are highly desirable and involved in industrial production and environmental *** combination of highly conductive MXene and metal oxide materials is a promising strategy to further improve the sensing *** this study,the hollow SnO_(2)nanospheres and few-layer MXene are assembled rationally via facile electrostatic synthesis processes,then the SnO_(2)/Ti_(3)C_(2)T_(x)nanocomposites were *** with that based on either pure SnO_(2)nanoparticles or hollow nanospheres of SnO_(2),the SnO_(2)/Ti_(3)C_(2)T_(x)composite-based sensor exhibits much better sensing performances such as higher response(36.979),faster response time(5 s),and much improved selectivity as well as stability(15 days)to 100ppm C2H5OH at low working temperature(200°C).The improved sensing performances are mainly attributed to the large specific surface area and significantly increased oxygen vacancy concentration,which provides a large number of active sites for gas adsorption and surface catalytic *** addition,the heterostructure interfaces between SnO_(2)hollow spheres and MXene layers are beneficial to gas sensing behaviors due to the synergistic effect.

关键词： Heterostructure Few-layer MXene SnO_(2)hollow spheres Ethanol sensor Synergistic effect SnO_(2)/Ti_(3)C_(2)T_(x)composites

Empress Wu Zetian and the Development of Buddhism:Historical Significance and Contemporary Implications

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Cultural and Religious Studies 2023年第11期11卷 564-568页

作者： shi yuxin No.2 High School of East China Normal University ShanghaiChina

The paper focuses on Wu Zetian,the only empress in China’s history,and her relationship with *** study focuses on the book Zizhi Tongjian and compares the differences in the portrayal of Wu Zetian’s connection with Buddhism with the ancient texts of the Old Tang Book and the New Tang *** uses historical contextualism to analyze the epochal implications of these differences in the Northern Song ***,the paper discusses how historians downplayed or marginalized Wu Zetian’s achievements while emphasizing the negative aspects of her ***,historian Sima Guang,who was influenced by Confucianism and his own political situation,produced a biased description of Wu Zetian and the Buddhism which she promoted during her reign.

关键词： Wu Zetian Zizhi Tongjian Buddhism character image implication of time

Recent Advance in Carbon Dots: From Properties to Applications

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Chinese Journal of Chemistry 2021年第5期39卷 1364-1388页

作者： Hao Wu Huimin Xu yuxin shi Ting Yuan Ting Meng Yang Zhang Wenjing Xie Xiaohong Li Yunchao Li Louzhen Fan College of Chemistry Key Laboratory of Theoretical&Computational Photochemistryand RadiopharmoceuticalsMinistry of EducationBeijing Normal UniversityBeijing 100875China

As a new type of nanomaterial,carbon dots(CDs)have been recognized as a versatile nanoplatform with enormous potential for biomedical and optoelectronic applications because of low cytotoxicity,photostability,biocompatibility and versatility in addition to their tunable *** this review,we aim at updating the latest research on preparation,optoelectronic and chemical properties of CDs as well as their biomedical and optoelectronic *** highlight the applications of CDs for stem cell imaging,cell nucleus imaging,two-photon fluorescence imaging,tumor diagnosis and therapy and their optoelectronic applications including light-emitting diodes(LEDs),solar cells and ***,we also discuss current challenges and breakthroughs on machine-learning-driven synthesis of CDs as well as nucleic acid detection with an eye towards the ***,we hope that this review will give further impulses to target-oriented research on CDs for biomedical and optoelectronic applications.

关键词： Carbon dots Cancer LEDs Machine-learning-driven synthesis Nucleic acids

Phenformin activates ER stress to promote autophagic cell death via NIBAN1 and DDIT4 in oral squamous cell carcinoma independent of AMPK

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International Journal of Oral Science 2024年第3期16卷 471-485页

作者： Dexuan Zhuang Shuangshuang Wang Huiting Deng yuxin shi Chang Liu Xue Leng Qun Zhang Fuxiang Bai Bin Zheng Jing Guo Xunwei Wu School and Hospital of Stomatology Cheeloo College of MedicineShandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Research Center of Dental Materials and Oral Tissue Regeneration&Shandong Provincial Clinical Research Center for Oral DiseasesJinanChina Engineering Laboratory for Biomaterials and Tissue Regeneration Ningbo Stomatology HospitalSavaid Stomatology SchoolHangzhou Medical CollegeNingboChina Cedars-Sinai Cancer Institute Department of Biomedical SciencesCedars-Sinai Medical CenterLos AngelesCAUSA

The efficient clinical treatment of oral squamous cell carcinoma(OSCC)is still a challenge that demands the development of effective new *** has been shown to produce more potent anti-tumor activities than metformin on different tumors,however,not much is known about the influence of phenformin on OSCC *** found that phenformin suppresses OSCC cell proliferation,and promotes OSCC cell autophagy and apoptosis to significantly inhibit OSCC cell growth both in vivo and in ***-seq analysis revealed that autophagy pathways were the main targets of phenformin and identified two new targets DDIT4(DNA damage inducible transcript 4)and NIBAN1(niban apoptosis regulator 1).We found that phenformin significantly induces the expression of both DDIT4 and NIBAN1 to promote OSCC ***,the enhanced expression of DDIT4 and NIBAN1 elicited by phenformin was not blocked by the knockdown of AMPK but was suppressed by the knockdown of transcription factor ATF4(activation transcription factor 4),which was induced by phenformin treatment in OSCC ***,these results revealed that phenformin triggers endoplasmic reticulum(ER)stress to activate PERK(protein kinase R-like ER kinase),which phosphorylates the transitional initial factor eIF2,and the increased phosphorylation of eIF2 leads to the increased translation of *** summary,we discovered that phenformin induces its new targets DDIT4 and especially NIBAN1 to promote autophagic and apoptotic cell death to suppress OSCC cell *** study supports the potential clinical utility of phenformin for OSCC treatment in the future.

关键词： drugs treatment AMPK DDI

Micro/nano metal–organic frameworks meet energy chemistry: A review of materials synthesis and applications

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eScience 2023年第2期3卷 32-59页

作者： Zhenyang Meng Ziming Qiu yuxin shi shixian Wang Guangxun Zhang Yecan Pi Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityJiangsu 225002China

Micro/nano metal–organic frameworks(MOFs)have attracted significant attention in recent years due to their numerous unique properties,with many synthetic methods and strategies being reported for constructing MOFs with specific micro/nano *** addition,the design of micro/nano MOFs for energy storage and conversion applications and the study of the structure–activity relationship have also become research ***,a comprehensive overview of the recent progress on micro/nano MOFs is *** begin with a brief introduction to the various synthesis methods for controlling the morphology of micro/nano ***,the structure-dependent properties of micro/nano MOFs as electrode materials or catalysts in terms of batteries,supercapacitors,and catalysis are ***,the remaining challenges and future perspectives in this field are ***,this review is expected to inspire the design of advanced micro/nano MOFs for efficient energy storage and conversion technologies.

关键词： Micro/nano MOFs Materials synthesis Energy storage and conversion Catalysis

Lithofacies paleogeography restoration and its significance of Jurassic to Lower Cretaceous in southern margin of Junggar Basin,NW China

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Petroleum Exploration and Development 2022年第1期49卷 78-93页

作者： GAO Zhiyong shi yuxin FENG Jiarui ZHOU Chuanmin LUO Zhong Petroleum Geology Research and Laboratory Center PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China State Key Laboratory of Enhanced Oil Recovery Beijing 100083China

In view of the difficulties in the study of lithofacies paleogeography and the low reliability of the distribution range of sedimentary sand bodies in the prototype basin caused by less deep drilling, complex seismic imaging and low degree of exploration in the southern margin of Junggar Basin, NW China. A new method based on the source to sink idea was used to restore lithofacies paleogeography and predict glutenite distribution. In the restoration, apatite fission track age was used to define range and uplift time of macro-provenance;the range of provenance area and the migration process of lake shoreline were restored based on the quantitative relationship between gravel diameter and transportation distance, tectonic shortening and other geological parameters;drilling cores and field outcrop sedimentary structures were analyzed, and a series of maps of lithofacies paleogeographic evolution and distribution range of glutenite bodies were compiled. It is concluded that from Early Jurassic to Early Cretaceous, in the southern margin of Junggar Basin, the provenance area gradually expanded from south to north, the lake basin expanded, shrunk and expanded, and the paleoclimate changed from humid to drought to humid. The western section always had proximal fan delta deposits from the southern ancient Tianshan provenance developed, and in the middle and eastern sections, the provenance areas evolved from far source to near source, mainly river-delta, braided delta, fan delta and other sediments developed. The boundary between provenance areas of the western and middle sections is speculated to be Hongche fault zone. In an angle open to the northwest with the current basin edge line, the restored ancient lake shoreline controlled the heterogeneity of reservoirs in the delta plain belt and delta front belt on its both sides. The ancient lake shoreline, current stratigraphic denudation line and current basin margin line limit the types and scope of favorable ***

关键词： southern margin of Junggar Basin deep lower assemblage Jurassic Cretaceous provenance lake shoreline lithofacies paleogeography favorable sandbody distribution