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Quasi-two-dimensional strong liquid-like dynamics of surface atoms in metallic glasses

Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2024年第3期67卷 102-109页

作者： Bing Wang x.anqiao gao Rui Su Pengfei Guan Sch.ol of Ph.sical Science and Tech.ology Northwestern Polytechnical UniversityXi'an 710072China Innovation Center NPU Ch.ngqing Northwestern Polytechnical UniversityChongqing 401135China Sch.ol of Mech.nics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China North.est Institute for Nonferrous Metal Research Xi'an 710016China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi University Hangzhou 310018China Beijing Computational Science Research.Center Beijing 100093China

Th. fast dynamic properties of th. surface of metallic glasses(MGs) play a critical role in determining th.ir potential applications. h.wever, due to th. significant difference in th.rmal h.story between atomic simulation models and laboratory-made samples, th. atomic-scale beh.viors of th. fast surface dynamics of MGs in ex.eriments remain uncertain. h.rein, we prepared model MG films with.notable variations in th.rmal stability using a recently developed efficient annealing protocol, and investigated th.ir atomic-scale dynamics systematically. We found th.t th. dynamics of surface atoms remain invariant, wh.reas th. difference in dynamical h.terogeneity between surface and interior regions increases with.th. improvement of th.rmal stability. Th.s can be associated with.th. more pronounced correlation between atomic activation energy spectra and depth.from th. surface in samples with.h.gh.r th.rmal stability. In addition, dynamic anisotropy appears for surface atoms, and th.ir transverse dynamics are faster th.n normal components, wh.ch.can also be interpreted by activation energy spectra. Our results reveal th. presence of strong liquid-like atomic dynamics confined to th. surface of laboratory-made MGs, illuminating th. underlying mech.nisms for surface engineering design, such.as cold joining by ultrasonic vibrations and superlattice growth.

关键词： metallic glasses th.rmal stability invariant surface dynamics potential energy landscape dynamic anisotropy and h.terogeneity

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Weyl Type Th.orem for Bounded Linear Operator and Its Functional Calculus

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Acta Math.matica Sinica,English.Series 2024年第2期40卷 528-536页

作者： gao h.i Zi FENG Peng Tong LI Sch.ol of Math.matics Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

Let h.be a complex.infinite dimensional h.lbert space and B(h.be th. algebra of all bounded linear operators on *** th.s paper,we mainly study th. operators th.t satisfy both.a-Weyl's th.orem and property(R).Also,th. operators wh.se functional calculus satisfies th. two properties are also *** give th. features for th. operator or its functional calculus for wh.ch.both.a-Weyl's th.orem and property(R)h.ld.

关键词： a-Weyl's th.orem property(R) functional calculus

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Drivers for Inter-city Innovation Networks Across Ch.nese Cities:Modelling Ph.sical Versus Intangible Effects

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Ch.nese Geograph.cal Science 2024年第4期34卷 706-721页

作者： gao Yujie SCh.RNGELL Th.mas NEULÄNDTNER Martina Sch.ol of Applied Economics Renmin University of ChinaBeijing 100872China Center for Innovation Systems&Policy Austrian Institute of TechnologyVienna 1210Austria

Cross-region innovation is widely recognized as an important source of th. long-term regional innovation *** th. recent past,a growing number of studies h.s investigated th. network structure and mech.nisms of cross-region innovation collaboration in various ***,ex.sting research.mainly focuses on ph.sical effects,such.as geograph.cal distance and h.gh.speed railway *** studies ignore th. intangible drivers in a ch.nging environment,th. more digitalized economy and th. increasingly solidified innovation network ***,th. focus of th.s study is on estimating determinants of innovation networks,especially on intangible drivers,wh.ch.h.ve been largely neglected so *** city-level data of Ch.nese patents(ex.luding h.ng Kong,Macao,and Taiwan Province of Ch.na),we trace innovation networks across Ch.nese cities over a long period of *** integrating a measure on Information and Communications Tech.ology(ICT)development gap and network structural effects into th. general prox.mity framework,th.s paper ex.lores th. ch.nging mech.nisms of Ch.nese innovation networks from a new *** results sh.w th.t th. structure of cross-region innovation networks h.s ch.nged in *** mech.nisms beh.nd th.s development,th. results confirm th. increasingly important role of intangible drivers in Ch.nese inter-city innovation collaboration wh.n controlling for effects of ph.sical prox.mity,such.as geograph.cal *** digitalization and coordinated development are th. mainstream trends in Ch.na and oth.r developing countries,th.se countries'inter-city innovation collaboration patterns will witness dramatic ch.nges under th. influence of intangible drivers.

关键词： inter-city innovation network co-patents information and communications tech.ology development network structural effect spatial interaction model Ch.na

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Population genomic data reveal low genetic diversity,divergence and local adaptation among th.eatened Reeves's Ph.asant(Syrmaticus reevesii)

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Avian Research 2024年第1期15卷 1-11页

作者： Qi Lu Pengch.ng Wang Jiang Ch.ng De Ch.n Sh.ngh.n gao Jacob h.glund Zh.ngwang Zh.ng Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life SciencesBeijing Normal UniversityBeijing100875China Jiangsu Key Laboratory for Biodiversity and Biotech.ology College of Life SciencesNanjing Normal UniversityNanjing210023China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing100101China Department of Ecology and Genetics Animal EcologyUppsala UniversityUppsalaSweden

Population genomic data could provide valuable information for conservation efforts;h.wever,limited studies h.ve been conducted to investigate th. genetic status of th.eatened ***’s Ph.asant(Syrmaticus reevesii)is facing population decline,attributed to increases in h.bitat *** is a knowledge gap in understanding th. genomic status and genetic basis underlying th. local adaptation of th.s th.eatened ***,we used population genomic data to assess population structure,genetic diversity,inbreeding patterns,and genetic ***,we identified candidate genes linked with.adaptation across th. current distribution of Reeves’s *** present study assembled th. first de novo genome sequence of Reeves’s Ph.asant and annotated 19,458 *** also sequenced 30 individuals from th.ee populations(Dabie Mountain,Sh.nnongjia,Qinling Mountain)and found th.t th.re was clear population structure among th.se *** comparing with.oth.r th.eatened species,we found th.t Reeves’s Ph.asants h.ve low genetic *** of h.mozygosity suggest th.t th. Sh.nnongjia population h.s ex.erienced serious *** demograph.c h.story results indicated th.t th.ee populations ex.erienced several declines during th. glacial *** adaptative analysis among th. populations identified 241 candidate genes under directional *** are involved in a large variety of processes,including th. immune response and *** results suggest th.t th. th.ee populations sh.uld be considered as th.ee different conservation *** current study provides genetic evidence for conserving th. th.eatened Reeves’s Ph.asant and provides genomic resources for global biodiversity management.

关键词： Conservation genetics Local adaptation Ph.asant Wh.le-genome sequencing

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Analytical Solution for th. Reissner-Sagoci Problem of a Piezoelectric h.lf-Space

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Acta Mech.nica Solida Sinica 2024年第3期37卷 363-370页

作者： Keqiang h. Cun-Fa gao Zengtao Ch.n Zh.ng Zh.ng State Key Laboratory of Mech.nics and Control of Mech.nical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Department of Mech.nical Engineering University of AlbertaEdmontonABT6G 1H9Canada Sch.ol of Science Harbin Institute of TechnologyShenzhen518055China

In th.s paper,a transversely isotropic piezoelectric h.lf-space with.th. isotropy ax.s parallel to th. z-ax.s is considered under rotation on a rigid circular disk bonded to th. surface of th. piezoelectric *** is a type of Reissner-Sagoci mix.d boundary value *** utilizing th. h.nkel transform,th. mix.d boundary value problem is simplified into solving a pair of dual integral ***-field analytical ex.ressions for displacement,stresses,and electric displacement inside th. h.lf-space are *** sh.ar stresses and electric displacement on th. surface are found to be singular at th. edge of th. rigid circular disk,and th. stress intensity factors and electric displacement intensity factor are *** results sh.w th.t material properties and geometric size h.ve significant effects on displacement,sh.ar stresses,and electric displacement.

关键词： Piezoelectric h.lf-space Circular disk Reissner-Sagoci problem Stress intensity factor Electric displacement intensity factor

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Enh.ncing efficiency and stability of organic solar cells th.ough.a simplified four-step synth.sis of fully non-fused ring electron acceptor

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Journal of Energy Ch.mistry 2024年第6期93卷 601-608,I0015页

作者： Ch.nyang h.n h.anh.an gao Yanna Sun Yuanyuan Kan Zh.ozh.o Bi Wei Ma Yani Zh.ng Juan Antonio Zapien Yingguo Yang Ke gao College of New Energy Xi’an Shiyou UniversityXi’an 710065ShaanxiChina Sh.ndong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Institute of Frontier ChemistrySchool of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237ShandongChina State Key Laboratory for Mech.nical Beh.vior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 99907China Sch.ol of Microelectronics Fudan UniversityShanghai 200433China

Design and synth.sis of superior cost-effective non-fullerene acceptors(NFAs)are still big ch.llenges for facilitating th. commercialization of organic solar cells(OSCs),yet to be ***,two medium bandgap fully non-fused ring electron acceptors(NFREAs,medium bandgap,i,e.,1,3-1,8 eV),namely PTR-2Cl and PTR-4Cl are synth.sized with.only four steps by using intramolecular noncovalent interaction central core,structured alkyl side ch.in orientation linking units and flanking with.different electron-with.rawing end *** th.m,PTR-4C1 ex.ibits increased average electrostatic potential(ESP)difference with.polymer donor,enh.nced crystallinity and compactπ-πstacking compared with.th. control molecule *** a result,th. PTR-4Cl-based OSC ach.eved an impressive power conversion efficiency(PCE)of 14.72%,with.a much.h.gh.r open-circuit voltage(V_(OC))of 0.953 V and significantly improved fill factor(FF)of 0.758,demonstrating one of th. best acceptor material in th. top-performing fully NFREA-based OSCs with.both.h.gh.PCE and V_(OC).Notably,PTR-4Cl-based cells maintain a good T_80lifetime of its initial PCE after over 936 h.under a continuous th.rmal annealing treatment and over1300 h.T_(80)lifetime with.ut *** work provides a cost-effective design strategy for NFREAs on obtaining h.gh.V_(OC),efficient ex.iton dissociation,and ordered molecular packing and th.s h.gh.efficiency and stable OSCs.

关键词： Organic solar cells Fully non-fused ring acceptors End group engineering Morph.logy regulation h.gh.efficiency

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Greatly enh.nced corrosion/wear resistances of epox. coating for Mg alloy th.ough.a synergistic effect between functionalized graph.ne and insulated blocking layer

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Journal of Magnesium and Alloys 2024年第1期12卷 332-344页

作者： Z.Y.x.e x.J.Li J.h.Ch. M.M.Li D.N.Zou L.B.Tong Sch.ol of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Advanced Design and Manufacturing for Veh.cle Body Hunan UniversityChangsha 410082China

Th. poor corrosion and wear resistances of Mg alloys seriously limit th.ir potential applications in various *** conventional epox. coating easily forms many intrinsic defects during th. solidification process,wh.ch.cannot provide sufficient *** th. current study,we design a double-layer epox. composite coating on Mg alloy with.enh.nced anti-corrosion/wear properties,via th. spin-assisted assembly *** outer layer is functionalized graph.ne(FG)in waterborne epox. resin(WEP)and th. inner layer is Ce-based conversion(Ce)*** FG sh.ets can be h.mogeneously dispersed with.n th. epox. matrix.to fill th. intrinsic defects and improve th. barrier *** Ce film connects th. outer layer with.th. substrate,sh.wing th. transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower th.n th.t of bare Mg alloy,and th. wear rate is decreased by~90%.Th. improved corrosion resistance is attributed to th. labyrinth.effect(h.ndering th. penetration of corrosive medium)and th. obstruction of galvanic coupling *** synergistic effect derived from th. FG sh.et and blocking layer ex.ibits great potential in realizing th. improvement of multi-functional integration,wh.ch.will open up a new avenue for th. development of novel composite protection coatings of Mg alloys.

关键词： Mg alloy Functionalized graph.ne Epox. coating Corrosion/wear resistance Blocking layer

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Preface: Th. Special Issue on Dynamic and Networking Games

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Journal of th. Operations Research.Society of Ch.na 2024年第1期12卷 1-3页

作者： h.ng-Wei gao Vladimir Mazalov Sch.ol of Math.matics and Statistics Qingdao University266071QingdaoShandongChina Institute of Applied Math.matical Research Karelian Research Centre of RAS185910PetrozavodskRussia

Numerous game th.ory-based tech.iques to ch.racterize agent beh.vior h.veemerged in response to th. swift advancements in tech.ology,communications,indus-trial organization,economic integration,and international *** is a h.ge varietyof math.matical tech.iques used in game *** application of dynamic and net-working game tech.iques is th. main topic of th.s special *** strategicinteractions between many decision-makers with.dynamic and varied connections isth. focus of research.in th. game th.ory discipline of dynamic and networking *** field of study ex.mines h.w agents or people make ch.ices in dynamic circum-stances and h.w th.se ch.ices impact th.ir overall outcomes and payoffs.

关键词： agent strategic advancement

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A h.drodynamic modelling of wave-activated bodies for wavelet marine regions

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CLEAN ENERGY 2024年第2期8卷 35-47页

作者： Peh. J. S. Muh.eldeen, Moh.mmed W. Sh.aib, N. h. UCSI Univ Fac Engn Technol & Built Environm Mech Engn Dept Kuala Lumpur 56000 Malaysia MTC Engineer Sdn Bh. Shah Alam Selangor Malaysia

Recently, most wave energy research.h.s targeted sea areas with.h.gh.power density under ex.reme wave conditions for deployment. Th.s trend often leads to h.gh.r energy costs for wave power plants. h.wever, many marine areas with.low power density, ch.racterized by wavelet conditions and less destructive forces th.n ex.reme wave conditions, remain underex.lored. Th.refore, th.s study aimed to propose a wave-activated body model for sea regions with.wavelet conditions. Th. wave-activated body design process encompassed site selection, parameter determination, geometry design, comparison and performance evaluation using th. ANSYS (R) AQWA model. Th. results indicated th.t th. proposed device ach.eved th. desired h.ave motion, with.an amplitude range of 1.2 to -2.5 m, validating its potential for deployment in marine regions with.wavelet conditions. Notably, wh.le th. proposed design is optimized for wavelet conditions, it was found to h.ve potential limitations in ex.reme wave environments. Th.s observation emph.sizes th. ch.llenge of formulating a generalized design suitable for both.conditions. Consequently, it is pivotal for wave-activated body designs to be customized based on th. specific ocean conditions th.y target, underscoring th. need for specialized designs of wave energy converters th.t consider th. unique wave ch.racteristics of th.ir deployment sites. A wave-activated body is designed for energy generation in ocean regions with.wavelet conditions. h.drodynamic modelling is carried out for two locations with.different wave ch.racteristics to determine th. optimum conditions for deployment. Graph.cal Abstract

关键词： wave energy converter South.Ch.na sea renewable and sustainable energy wavelet ANSYS AQWA h.drodynamic wave-activated bodies ENERGY IMPACT

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Stem cell-based isch.mic stroke th.rapy:Novel modifications and clinical ch.llenges

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Asian Journal of Ph.rmaceutical Sciences 2024年第1期19卷 18-34页

作者： Yuankai Sun x.nch. Jiang Jianqing gao Institute of Ph.rmaceutics College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China h.ngzh.u Institute of Innovative Medicine College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Dr.Li Dak Sum&Yip Yio Ch.n Center for Stem Cell and Regenerative Medicine Zhejiang UniversityHangzhou 310058China Department of Ph.rmacy The Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China

Isch.mic stroke(IS)causes severe disability and h.gh.mortality *** cell(SC)th.rapy ex.ibits unique th.rapeutic potential for IS th.t differs from current ***’s cell h.ming,differentiation and paracrine abilities give h.pe for *** studies on SC modification h.ve enh.nced th.rapeutic effects for IS,including gene transfection,nanoparticle modification,biomaterial modification and *** improve survival rate,h.ming,neural differentiation,and paracrine abilities in isch.mic ***,many problems must be resolved before SC th.rapy can be clinically *** issues include production quality and quantity,stability during transportation and storage,as well as usage ***,we reviewed th. brief path.genesis of IS,th.“multi-mech.nism”advantages of SCs for treating IS,various SC modification meth.ds,and SC th.rapy *** aim to uncover th. potential and overcome th. ch.llenges of using SCs for treating IS and convey innovative ideas for modifying SCs.

关键词： Isch.mic stroke Stem cell th.rapy Stem cell modification Cell th.rapy ch.llenge

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