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Some conjectures on modular representations of affine sl_2 and Virasoro algebra

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Science China Mathematics 2018年第2期61卷 385-390页

作者： weiqiang wang Department of Mathematics University of Virginia

We conjecture an explicit bound on the prime characteristic of a field, under which the Weyl modules of affine sl_2 and the minimal series modules of Virasoro algebra remain irreducible, and Goddard-Kent-Olive coset c... 详细信息

关键词： Virasoro algebra affine algebras module representation

Decadal variation and trend of the upper layer salinity in the South China Sea from 1960 to 2010

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Journal of Oceanology and Limnology 2022年第4期40卷 1333-1348页

作者： Wenjing ZHANG weiqiang wang Huibin XING State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China South China Sea Information Center State Oceanic AdministrationGuangzhou 510301China South China Sea Marine Prediction Center State Oceanic AdministrationGuangzhou 510310China

Ocean salinity is an essential measurable indicator of water cycle and plays a crucial role in regulating ocean and climate *** Simple Ocean Data Assimilation(SODA)reanalysis product,substantial decadal variability of the salinity in the upper layer of the South China Sea(SCS)from 1960 to 2010 was *** show that a decadal variation of the upper layer salinity is *** upper layer(100 m)waters are found to freshen from 1960,become saltier during 1975 to 1995,and freshen again from 1995 to *** strongest anomalies appear in the northeastern,northern,and northwestern regions in the three periods,*** salinity variation trends become weaker below the upper layer,except the salinifi cation trend in the northern SCS extends to at least 300 m during the salinifi cation *** of the salinity budget over the top 100 m shows that during the fi rst freshening period horizontal advection,vertical advection,and surface freshwater forcing all contribute to salinity freshening,and horizontal advection is relatively *** contribution of horizontal advection and surface freshwater forcing to the positive salinity anomaly is comparable,while the vertical advection is the secondary factor in the salinifi cation *** advection,especially zonal advection,plays a crucial role during the second freshening ***,horizontal advection is more important than that in the fi rst freshening *** addition,the contribution of horizontal advection is mainly in zonal direction controlled by Kuroshio *** analysis shows the upper-layer salinity variations have a Pacifi c Decadal Oscillation(PDO)-like signal,with freshening during the negative PDO years,and salinifi cation during the positive PDO *** mainly infl uences the upper-layer salinity changes through both atmospheric bridge and oceanic bridge.

关键词： salinity South China Sea(SCS) decadal variation trend salinity budget analysis

Mechanism and Method of Testing Fracture Toughness and Impact Absorbed Energy of Ductile Metals by Spherical Indentation Tests

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Chinese Journal of Mechanical Engineering 2023年第5期36卷 156-173页

作者： Jianxun Li Tairui Zhang Shang wang Jirui Cheng weiqiang wang Key Laboratory of High-efciency and Clean Mechanical Manufacture(Ministry of Education) National Demonstration Center for Experimental Mechanical Engineering Education(Shandong University)School of Mechanical EngineeringShandong UniversityJinan 250061China School of Mechanical Engineering Southeast UniversityNanjing 211189China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China

To address the problem of conventional approaches for mechanical property determination requiring destructive sampling, which may be unsuitable for in-service structures, the authors proposed a method for determining the quasi-static fracture toughness and impact absorbed energy of ductile metals from spherical indentation tests (SITs). The stress status and damage mechanism of SIT, mode I fracture, Charpy impact tests, and related tests were frst investigated through fnite element (FE) calculations and scanning electron microscopy (SEM) observations, respectively. It was found that the damage mechanism of SITs is diferent from that of mode I fractures, while mode I fractures and Charpy impact tests share the same damage mechanism. Considering the diference between SIT and mode I fractures, uniaxial tension and pure shear were introduced to correlate SIT with mode I fractures. Based on this, the widely used critical indentation energy (CIE) model for fracture toughness determination using SITs was modifed. The quasi-static fracture toughness determined from the modifed CIE model was used to evaluate the impact absorbed energy using the dynamic fracture toughness and energy for crack initiation. The efectiveness of the newly proposed method was verifed through experiments on four types of steels: Q345R, SA508-3, 18MnMoNbR, and S30408.

关键词： Spherical indentation tests Fracture toughness CIE model Impact absorbed energy

Roles of Equatorial Ocean Currents in Sustaining the Indian Ocean Dipole Peak

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Journal of Ocean University of China 2022年第3期21卷 622-632页

作者： XING Huibin wang weiqiang wang Dongxiao XU Kang State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China University of Chinese Academy of Sciences Beijing100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou511458China School of Marine Sciences Sun Yat-sen UniversityZhuhai519082China

In this study,on the basis of the results of the European Centre for Medium-Range Weather Forecasts Ocean Reanalysis System 4,the response of equatorial ocean currents and their roles during the peak phase of the Indian Ocean Dipole(IOD)are comprehensively *** the IOD peak season,a series of ocean responses ***,significant meridional divergence in the surface layer and convergence in the subsurface layer are found in the equatorial *** equatorial easterly winds and offequatorial wind curl anomalies are found to be responsible for the divergence at 55°–80°E and the convergence at 70°–90°***,the meridional divergence and convergence are found to favor a weakened Wyrtki jet(WJ)in the surface layer and an enhanced Equatorial Undercurrent(EUC)in the subsurface layer,***,these ocean responses provide ocean positive feedback that sustains the IOD peak as the weakened WJ and enhanced EUC help maintain the zonal temperature ***,heat budget analyses indicate that the weakened WJ favors sea surface temperature anomaly warming in the western Indian Ocean,whereas the enhanced EUC maintains the sea surface temperature anomaly cooling in the eastern Indian Ocean.

关键词： surface divergence subsurface convergence equatorial zonal currents the Indian Ocean Dipole positive feedback

Bonding strength of graded anti-corrosive coatings of fluoroethylenepropylene (FEP)/polyphenylene sulfide (PPS)

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Journal of University of Science and Technology Beijing 2005年第6期12卷 572-576页

作者： Jie Bian weiqiang wang Congsheng Guan Yonghui Zhao School of Materials Science and Engineering Shandong University Jinan 250061 China School of Mechanical Engineering Shandong University Jinan 250061 China School of Chemical Technology Shandong University Jinan 250061 China

Fluororesin-based anti-corrosive coatings including graded FEP/PPS were prepared on carbon steel by melt powder coating, the bonding strength of all coating systems was determined by the pull-off test. It is found that the poor adhesion of fluororesin coatings to metallic substrates is improved obviously by the graded coating structure of FEP/PPS, and the bonding strength reaches up to 11.8 MPa for the five-layer system. Examination by electron probe microanalysis （EPMA） verifies that the distribution of main components is graded in the five-layer system, which is responsible for the enhancement of the interfacial bonding.

关键词： fluororesin anti-corrosive coating graded coating structure polyphenylene sulfide (PPS) bonding strength

Zonal overturning circulation and heat flux induced by heaving modes in the world oceans

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Acta Oceanologica Sinica 2015年第11期34卷 80-91页

作者： TAN Wei HUANG Rui Xin wang weiqiang wang Xin Hohai University State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Woods Hole Oceanographic Institution

Zonal overturning circulation （ZOC） and its associated zonal heat flux （ZHF） are important components of the oceanic circulation and climate system, although these conceptions have not received adequate attentions. Heaving induced by inter-annual and decadal wind stress perturbations can give rise to anomalous ZOC and ZHF. Based on a simple reduced gravity model, the anomalous ZOC and ZHF induced by idealized heaving modes in the world oceans are studied. For example, in a Pacific-like model basin intensified equatorial easterly on decadal time scales can lead to a negative ZOC with a non-negligible magnitude （-0.3×10^6 m^3/s） and a considerable westward ZHF with an amplitude of -11.2 TW. Thus, anomalous ZOC and ZHF may consist of a major part of climate signals on decadal time scales and thus play an important role in the oceanic circulation and climate change.

关键词： adiabatic motions heaving wind-driven circulation zonal overturning circulation zonal heat flux

Fe-Zn alloy, a new biodegradable material capable of reducing RoS and inhibiting oxidative stress

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Regenerative Biomaterials 2024年第2期3卷 114-122页

作者： Shuaikang Yang weiqiang wang Yanan Xu Yonghui Yuan Shengzhi Hao School of Materials Science and Engineering Dalian University of TechnologyDalian 116024PR China Clinical Research Center for Malignant Tumor of Liaoning Province Cancer Hospital of Dalian University of TechnologyShenyang 110042PR China

Fe-based biodegradable materials have attracted significant attention due to their exceptional mechanical properties and favorable ***,research on Fe-based materials mainly focuses on regulating the degradation ***,excessive release of Fe ions during material degrada-tion will induce the generation of reactive oxygen species(ROS),leading to oxidative stress and ***,the con-trol of RoS release and the improvement of biocompatibility for Fe-based materials are very *** this study,new Fe-Zn alloys were prepared by electrodeposition with the intention of using Zn as an antioxidant to reduce oxidative damage during alloy ***,the impact of three potential degra-dation ions(Fe^(2+),Fe^(3+),Zn^(2+))from the Fe-Zn alloy on human endothelial cell(EC)activity and migration ability was ***,cell adhesion,cell activity,ROs production and DNA damage were assessed at various locations surrounding the ***,the influence of different concentrations of Zn^(2+) in the medium on cell viability and ROS production was *** levels of ROS exhibited evident toxic effects on ECs and promoted DNA *** an antioxidant,Zn?+effectively reduced ROS production around Fe and improved the cell viability on its surface at a concentration of 0.04 mmol/*** findings demonstrate that Fe-Zn alloy can attenuate the ROS generated from Fe degradation therebyenhancingcytocompatibility.

关键词： biodegradable iron Fe-Zn alloys reactive oxygen species oxidative stress cytocompatibility

Heat contribution of the Indonesian throughflow to the Indian Ocean

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Acta Oceanologica Sinica 2019年第4期38卷 72-79页

作者： Tiecheng Zhang weiqiang wang Qiang Xie Lingfang Chen Institute of Deep-sea Science and Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao)

Based on the high-resolution Eulerian fields of an ocean general circulation model simulation, the heat contribution of the Indonesian throughflow(ITF) to the Indian Ocean is estimated by Lagrangian tracing *** heat transport of each particle of ITF waters is calculated by tracing temperature change along the trajectory until the particle exits the Indian Ocean. The simulation reveals that the ITF waters flow westward and branch near Madagascar, further showing the ITF waters are redistributed in both northern and southern Indian *** budget analysis indicates that the ITF waters gain 0.41 PW(Petawatts, 1015 W) in the northern Indian Ocean and lose 0.56 PW in the southern Indian Ocean, respectively. As a result, the ITF waters warm the whole Indian Ocean basin with only 0.15 PW, which shows an "insignificant" role of ITF on the Indian Ocean because of the heat exchange compensation between northern and southern Indian Ocean. Furthermore, the tracing pathways show that the ITF waters mainly flow out the Indian Ocean at both sides of the basin via Agulhas Current and Leeuwin Current. About 89% of the ITF waters leave along western boundary and the rest 11% along eastern boundary. Compared to seeding section, 0.10 PW and 0.05 PW are released to the Indian Ocean, respectively.

关键词： Indonesian throughflow Indian Ocean heat contribution

Structural and Regulating Characteristics of Adjustable Annulus-clearance Nozzle Used in Supercritical Fluid Precipitation

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1487-1492页

作者：曲延鹏刘燕 LIU Songming wang weiqiang LI Aiju School of Mechanical-Engineering Shandong University Jinan250061 China Shanda-Lunan Research Instiute of SupercriticalFluid Technology Jinan 250061 China YuYao Entry-Exit Inspection and Quarantine Bureau of PRC Yuyao 315400 China School of Material Engineering Shandong University Jinan 250061 China

A new type of adjustable nozzle with an annulus clearance between the surfaces of a revolved solid and the matched hole was analyzed, which contained matching parts, regulating parts, guiding elements, and sealing part. The general regulating function of the adjustable nozzle was derived and the regulating and matching characteristics were also analyzed. Through the analysis, it was concluded that the matching-profile curve of either the revolved body or matched hole should be chosen as a straight line in order to keep the linear regulating feature. Moreover, the multi-annulus-clearance nozzle was designed, and some experiments were carried out on preparing budesonide particles with the nozzle. According to the experimental results, it was proved that the annulus nozzles is practical in preparing micro-particles by supercritical fluid precipitation method.

关键词： annulus-clearance nozzle adjustable structure regulating characteristics conic matching supercritical fluid precipitation