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Quantif.ing Contribution of.Recycled Moisture to Precipitation in Temperate Glacier Region,Southeastern tibetan Plateau,China

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Chinese Geographical Science 2024年第4期34卷 764-776页

作者： ma Yanwei PU Tao SHI Xiaoyi ma Xinggang YU Hongmei College of.Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China National f.eld Science Observation and Research Station of.Yulong Snow Mountain Cryosphere and Sustainable Development Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China State Key Laboratory of.Cryospheric Sciences Northwest Institute of Eco-environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Recycled moisture is an important indicator of.the renewal capacity of.regional water *** to the existence of.Yulong Snow Mountain,Lijiang in Yunnan Province,southeast of.the Qinghai-tibet Plateau,China,is the closest ocean glacier area to the equator in *** precipitation samples were collected f.om 2017 to 2018 in Lijiang to quantif. the ef.ect of.sub-cloud evaporation and recycled moisture on precipitation combined with the d-excess model during monsoon and non-monsoon *** results indicated that the d-excess values of.precipitation f.uctuated between–35.6‰and 16.0‰,with an arithmetic mean of.3.5‰.The local meteoric water line(LMWL)wasδD=7.91δ^(18)O+2.50,with a slope slightly lower than the global meteoric water line(GMWL).Subcloud evaporation was higher during the non-monsoon season than during the monsoon *** tended to peak in march and was primarily inf.uenced by the relative *** source of.the water vapour af.ected the proportion of.recycled *** to the results of.the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model,the main sources of.water vapour in Lijiang area during the monsoon period were the southwest and southeast *** the non-monsoon period,water vapour was transported by a southwesterly *** recycled moisture in Lijiang area between march and October 2017 was 10.62%.Large variations were observed between the monsoon and non-monsoon seasons,with values of.5.48%and 25.65%,*** dif.erences were primarily attributed to variations in the advection of.water *** recycled moisture has played a supplementary role in the precipitation of.Lijiang area.

关键词： recycled moisture stable isotope precipitation d-excess Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model southeastern tibetan Plateau China

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Land-population-industry based village evolution and its inf.uencing f.ctors in the upper Tuojiang River

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Journal of.Mountain Science 2024年第8期21卷 2790-2809页

作者： ZHAN Yunjun JI Yuxin HUANG Jiejun ma Changying ma Chuanqi School of.Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

With economic development and urbanization in China,the rural settlements have experienced great *** explore the evolution process of.rural settlements in terms of.land,population and industry can reveal the development law of.rural spatial distribution,population structure and industrial economy in dif.erent stages and *** the development status and evolution characteristics of.villages in the upper Tuojiang River basin in Southwest China in the past 20 years are of.signif.cant *** upper Tuojiang River basin includes the main types of.terrain f.und in the Southwest region:mountainous,plains,and hills,exhibiting a certain typicality of.geographical *** study took towns and townships at the town-level scale as the basic unit of.research,and constructed an evaluation system f.r village evolution based on'land,population,and industry'.It employed Criteria Importance Through Inter-Criteria Correlation(CRItiC)analysis to examine the characteristics of.village evolution in the area f.om 2000 to 2020,and used geographic detector analysis to identif. the leading f.ctors af.ecting village *** results show that:(1)f.om 2000 to 2010,villages in the upper Tuojiang River basin experienced signif.cant changes,and the pace of.these transf.rmations slowed f.om 2010 to 2020.(2)f.om a comprehensive perspective,f.om 2000 to 2020,villages in hilly areas show a decline,while villages in plain areas near the city center show a positive urbanization development.(3)Road accessibility and distance f.om the city center are the main f.ctors that explain the spatial dif.erentiation of.village evolution degree in the study *** study elucidates the spatiotemporal evolution characteristics of.villages in the upper Tuojiang River basin and identif.es the primary f.ctors contributing to their changes,which will provide a ref.rence f.r investigating the development of.rural areas in dif.erent terrains of.Southwest China.

关键词： Village evolution Land Population Industry Geographic detector

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time-lagged Ef.ects of.the Spring Atmospheric Heat Source over the tibetan Plateau on Summer Precipitation in Northeast China during 1961–2020:Role of.Soil Moisture

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Advances in Atmospheric Sciences 2024年第8期41卷 1527-1538页

作者： Yizhe HAN Dabang JIANG Dong SI Yaoming ma Weiqiang ma Institute of.Atmospheric Physics Chinese Academy of SciencesBeijing 100029China National Institute of.Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China State Key Laboratory of.tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of.Chinese Academy of.Sciences Beijing 100049China College of.Atmospheric Sciences Lanzhou UniversityLanzhou 730000China National Observation and Research Station f.r Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China Kathmandu Center of.Research and Education Chinese Academy of SciencesBeijing 100101China China-Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan

The spring atmospheric heat source(AHS)over the tibetan Plateau(TP)has been suggested to af.ect the Asian summer monsoon and summer precipitation over South ***,its inf.uence on the summer precipitation in Northeast China(NEC)remains *** connection between spring TP AHS and subsequent summer precipitation over NEC f.om 1961 to 2020 is analyzed in this *** illustrate that stronger spring TP AHS can enhance subsequent summer NEC precipitation,and higher soil moisture in the Yellow River Valley-North China region(YRVNC)acts as a *** spring,the strong TP AHS could strengthen the transportation of.water vapor to East China and lead to excessive rainf.ll in the ***,soil moisture increases,which regulates local thermal conditions by decreasing local surf.ce skin temperature and sensible *** to the memory of.soil moisture,the lower spring sensible heat over the YRVNC can last until mid-summer,decrease the land–sea thermal contrast,and weaken the southerly winds over the East Asia–western Pacif.c region and convective activities over the South China Sea and tropical western *** modulates the East Asia–Pacif.c teleconnection pattern,which leads to a cyclonic anomaly and excessive summer precipitation over NEC.

关键词： tibetan Plateau atmospheric heat source Northeast China summer precipitation soil moisture

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f.st X-ray imaging beamline at SSRf

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Nuclear Science and Techniques 2024年第9期35卷 68-81页

作者： Ke Li Hong-Lan Xie Ya-Nan f. f.i-Xiang Wang Guo-Hao Du Jian-f.ng ji Biao Deng ti-Qiao Xiao Shanghai Synchrotron Radiation f.cility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The f.st X-ray imaging beamline(BL16U2)at Shanghai Synchrotron Radiation f.cility(SSRf.is a new beamline that provides X-ray micro-imaging capabilities across a wide range of.time scales,spanning f.om 100 ps toμs and *** beamline has been specif.cally designed to f.cilitate the investigation of.a wide range of.rapid phenomena,such as the def.rmation and f.ilure of.materials subjected to intense dynamic *** addition,it enables the study of.high-pressure and high-speed f.el spray processes in automotive *** light source of.this beamline is a cryogenic permanent magnet undulator(CPMU)that is cooled by liquid *** CPMU can generate X-ray photons within an energy range of.8.7-30 *** beamline of.ers two modes of.operation:monochromatic beam mode with a liquid nitrogen-cooled double-crystal monochromator(DCM)and pink beam mode with the f.rst crystal of.the DCM out of.the beam *** X-ray imaging methods were implemented in BL16U2:single-pulse ultraf.st X-ray imaging,microsecond-resolved X-ray dynamic imaging,millisecond-resolved X-ray dynamic micro-CT,and high-resolution quantitative ***,BL16U2 is equipped with various in situ impact loading systems,such as a split Hopkinson bar system,light gas gun,and f.el spray *** the completion of.the f.nal commissioning in 2021 and subsequent trial operations in 2022,the beamline has been of.icially available to users f.om 2023.

关键词： Multiple time-scale X ray imaging Single-pulse X ray imaging Dynamic 2D imaging Dynamic micro-CT

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Ef.ect of.Cryogenic Treatment on Microstructure and Tribological Property Evolution of.Electron Beam Melted ti6Al4V

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Journal of.Wuhan University of.Technology(materials Science) 2024年第4期39卷 1010-1017页

作者：黄西娜 ma Xiaowen XU tianyi School of.Mechanical and Electrical Engineering China University of Mining and Technology-BeijingBeijing 100083China School of.Engineering and Technology China University of GeosciencesBeijing 100083China

Cryogenic treatment was used to improve the tribological properties of.ti6Al4V artif.cial hip joint *** treatment at-196℃with dif.erent holding time were carried out on ti6Al4V specimens f.bricated using electron beam melting(EBM),and their microstructure and tribological properties evolution were systematically analyzed by scanning electron microscopy(SEM),vickers hardness,and wear *** experimental results show that the as-f.bricated specimen consists of.lamellarαphase andβcolumnar ***,the thickness of.lamellarαphase decreased af.er cryogenic *** addition,it can be f.und that the f.neαphase was precipitated and dispersed between the lamellarαphase with the holding time *** hardness shows a trend of.f.rst increasing and then *** wear rate of.the specimen cryogenic treated f.r 24 h is the minimum and the average f.iction coef.icient is 0.50,which is reduced by 14.61%compared with the *** wear mechanism of.the as-f.bricated specimen is severe exf.liation,adhesive,abrasive,and slight f.tigue ***,the specimen cryogenic treated f.r 24 h shows slight adhesive and abrasive *** can be concluded that it is f.asibility of.utilizing cryogenic treatment to reduce the wear of.EBMed ti6Al4V.

关键词： electron beam melting(EBM) cryogenic treatment microstructure vickers hardness tribological property

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Bioinspired nanomaterials f.r the treatment of.bacterial inf.ctions

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Nano Research 2024年第2期17卷 691-714页

作者： Xiaojing ma Wenjing Tang Rong Yang Robert f.Smith School of.Chemical&Biomolecular Engineering Cornell UniversityIthacaNY 14853USA

Inf.ctious diseases pose a serious threat to global *** immunizations can control most viral inf.ctions,bacterial inf.ctions,particularly those caused by drug-resistant strains,continue to cause high rates of.illness and ***,the creation of.new antibiotics has come to a grinding halt in the last ten *** response to this crisis,nanotechnology has emerged as a hopef.l solution to tackle drug resistance and enhance treatment results.A large variety of.biomimetic nanomaterials,termed nanozymes,have demonstrated strong antimicrobial *** the inherent toxicity of.nanomaterials is a concern,recent studies have harnessed the stimuli-responsiveness of.nanomaterials to enable local and/or targeted delivery to reduce the treatment side ***,the physicochemical versatility of.nanomaterials af.ords many degrees of.f.eedom that enable rational design of.smart or autonomous therapeutics,which cannot be achieved using conventional *** design straddles the f.elds of.catalysis,nanoscience,microbiology,and translational *** provide an overview of.this interdisciplinary landscape,this review is organized based on composition into lipid,metal,metal oxide,and non-metallic *** as a delivery vehicle enhance bioavailability and reduce ***-and metal oxide-based nanomaterials inhibit bacterial growth by mimicking natural enzymatic activities such as peroxidase(POD)and ***,carbon-,polymer-,and cell membrane-based nanomaterials are combined into a discussion on non-metallic *** the end of.this review,potentially f.uitf.l directions f.r f.ture bioinspired nanomaterials in inf.ctious disease treatment are included.

关键词： bioinspired nanomaterial bacteria inf.ctious disease antimicrobial liposome nanozyme

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Numerical investigation on characteristics of.interf.cial wave of.liquid f.lm in gas-liquid two-phase f.ow using Openf.AM

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Chinese Journal of.Aeronautics 2024年第2期37卷 233-248页

作者： Xiaoqi ma Yueshe WANG Jiaming tiAN State Key Laboratory of.Multiphase f.ow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Liquid f.lm cooling as an advanced cooling technology is widely used in space *** operation of.liquid f.lm along the rocket combustion inner wall is crucial f.r thermal protection of.rocket *** stability of.liquid f.lm is mainly determined by the characteristics of.interf.cial wave,which is rarely investigated right *** to improve the stability of.thin f.lm has become a hot *** view of.this,an advanced model based on the conventional Volume of.f.uid(VOf.model is adopted to investigate the characteristics of.interf.cial wave in gas-liquid f.ow by using Openf.AM,and the mechanism of.f.rmation and development of.wave is revealed intuitively through numerical *** ef.ects f.om gas velocity,surf.ce tension and dynamic viscosity of.liquid(three f.ctors)on the wave are studied *** can be f.und that the gas velocity is critical to the f.rmation and development of.wave,and f.ur modes of.droplets generation are illustrated in this ***,a gas vortex near the gas-liquid interf.ce can induce f.rmation of.wave easily,so changing the gas vortex state can regulate f.rmation and development of.***’s more,the change rules of.three f.ctors inf.uencing on the interf.cial wave are obtained,and the surf.ce tension has a negative ef.ect on the f.rmation and development of.wave only when the surf.ce tension coef.icient is above the critical value,whereas the dynamic viscosity has a positive ef.ect in this ***,the maximum height and maximum slope angle of.wave will level of. as the gas velocity ***,the maximum slope angle of.wave is usually no more than 38°,no matter what happens to the three f.ctors.

关键词： Interf.cial wave Gas-liquid Two-phase f.ow VOf.model Openf.AM

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Access to High-molecular-Weight Polyethylenes through High Temperature Ethylene Polymerization Catalysed by Ethylene-Bridged ansa-(3-R-Cyclopentadienyl)(f.uorenyl) Zirconocene Complexes

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Chinese Journal of.Polymer Science 2024年第1期42卷 42-51,I0007页

作者： Bo Li Haiyan ma Jiling Huang Shanghai Key Laboratory of.f.nctional materials Chemistry and Laboratory of.Organometallic Chemistry School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

A series of.C1-symmetric ethylene-bridged ansa-(3-R-cyclopentadienyl)(f.uorenyl) metallocene complexes(Zr: 1-5;Hf. 6) have been synthesized, characterized and investigated as catalyst precursors f.r the high temperature ethylene polymerization. Using methylaluminoxane(maO) as the cocatalyst, zirconium complexes 1-5 bearing a bulky substituent on the 3-position of.the cyclopendienyl ring showed high catalytic activities up to 1.48×10^(7) g PE·mol_(Zr)^(-1)·h^(-1) toward the polymerization of.ethylene and af.orded polyethylenes with high molecular weights(1.49×10^(5)-6.31×10^(5) g/mol), meanwhile exhibting great thermal stability at high temperatures up to 120 ℃ together with a long catalytic lif. time up to 2 h. By adopting low Al/Zr ratios, such as 125, polyethylenes with ultra high molecular weights up to 2.86×106 g/mol were obtained. It is worthy of.noting that zirconium complexes 1-4 bearing a substituent with an aryl pendant showed temperature-dependent activities, which increased rapidly with the increase of.polymerization temperature, thus weak interaction of.the pendent aryl group with the cationic active center is proposed to account f.r the very low activities displayed at low temperatures. In contrast to zirconocene complexes 1-5, haf.ocene complex 6 only displayed very low catalytic activities toward the polymerization of.ethylene and af.orded polyethylenes with molecular weights ten times smaller than those obtained by zirconocene complexes 1-5. Zirconocene complexes 1-5 were also able to catalyse the polymerization of.propylene at high temperatures, but only af.orded waxes with low molecular weights.

关键词： ansa-Metallocene Ethylene Propylene Polymerization High temperature

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Ef.ects of.baf.le position in serpentine f.ow channel on the perf.rmance of.proton exchange membrane f.el cells

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Chinese Journal of.Chemical Engineering 2024年第5期69卷 250-262页

作者： Guodong Xia Xiaoya Zhang Dandan ma MOE Key Laboratory of.Enhanced Heat Transf.r and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China

This study used a three-dimensional numerical model of.a proton exchange membrane f.el cell with f.ve types of.channels:a smooth channel(Case 1);eight rectangular baf.les were arranged in the upstream(Case 2),midstream(Case 3),downstream(Case 4),and the entire cathode f.ow channel(Case 5)to study the ef.ects of.baf.le position on mass transport,power density,net power,***,the ef.ects of.back pressure and humidity on the voltage were *** showed that compared to smooth channels,the oxygen and water transport f.cilitation at the dif.usion layer-channel interf.ce were added 11.53%-20.60%and 7.81%-9.80%at 1.68 A·cm^(-2)by adding *** closer the baf.les were to upstream,the higher the total oxygen f.ux,but the lower the f.ux unif.rmity the worse the water *** oxygen f.ux of.upstream baf.les was 8.14%higher than that of.downstream baf.les,but oxygen f.ux unif.rmity decreased by 18.96%at 1.68 A·cm^(-2).The order of.water removal and voltage improvement was Case 4>Case 5>Case 3>Case 2>Case *** power of.Case 4 was 9.87%higher than that of.the smooth *** the Case 4,when the cell worked under low back pressure or high humidity,the voltage increments were *** potential increment f.r the back pressure of.0 atm was 0.9%higher than that of.2 atm(1 atm=101.325 kPa).The potential increment f.r the humidity of.100%was 7.89%higher than that of.50%.

关键词： Proton exchange membrane f.el cell Baf.le position mass transf.r Net power Unif.rmity Voltage increment

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Measuring f.nancial Systemic Risk:Net Liability Clearing Mechanism and Contagion Ef.ect

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Journal of.Systems Science & Complexity 2024年第3期37卷 1114-1146页

作者： ma Jiali ZHU Shushang LI Duan College of.Big Data Statistics Guizhou University of Finance and EconomicsGuiyang 550025China School of.Business Sun Yat-Sen UniversityGuangzhou 510275China School of.Data Science City University of Hong KongHong Kong 999077China

f.llowing the f.amework of.E-N model(Eisenberg and Noe,2001),the authors consider a new clearing mechanism based on net liabilities among f.nancial institutions since the liabilities between the counterparties should be deducted accordingly when clearing in *** the basis f.r systemic risk measurement,similar to the original E-N model,the authors f.rst establish some good properties f.r the clearing payment vector according to a more general ***,the authors investigate how risk spreads among institutions through the liability network f.rming the risk contagion ***,the authors illustrate with a specif.c example that the original E-N clearing mechanism may misidentif. the systemic important institutions,and theoretically show that it may also overestimate the risk compared with the netting clearing mechanism.

关键词： Clearing mechanism contagion net liability network systemic risk

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