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Ultrafast optical investigation of carrier and.spin d.namics in low-d.mensional perovskites

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Science China(Technological Sciences) 2024年第1期67卷 2-18页

作者： FU JinYue JIANG Ying fang HongHua Key Laboratory for Micro-Nano Physics and.Technology of Hunan Province School of Physics and ElectronicsHunan UniversityChangsha 410012China State Key Laboratory of Precision Measurement Technology and.Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Low-d.mensional perovskite(PVK)materials have attracted.significant research interest,because of their quantum-confined.effect,tunable band.gap structures,and.higher stability than that of three-d.mensional(3d.*** semicond.ctor optoelectronic d.vices,high speed.and.small size are closely *** d.velopment of high-speed.d.vices requires researchers to fully und.rstand.the properties of materials,especially the d.namic processes such as carrier recombination,separation,and.transport,which often play a crucial role in the performance of *** an ind.spensable part of d.namic research,spin relaxation is also of great significance in stud.ing the properties of materials and.explore possible *** halid. PVK materials have strong spin-orbit coupling(SOC),which provid.s a basis for information storage and.processing by using spin d.grees of ***,stud.ing the carrier and.spin d.namics of low-d.mensional PVKs is an effective way to und.rstand.the internal properties of low-d.mensional PVKs *** paper summarizes the latest research progress on the ultrafast carrier and.spin d.namics in low-d.mensional PVKs,to comprehensively und.rstand.their carrier and.spin behaviors and.present an outlook for relevant stud.es in this area.

关键词： low-d.mensional perovskites carrier d.namics spin d.namics optoelectronic d.vices

Low-thermal-bud.et synthesis of monolayer MoS2

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Science China Materials 2024年第1期67卷 372-374页

作者： Zongmeng Yang Shibo fang Jing Lu State Key Laboratory for Mesoscopic Physics and.School of Physics Peking University Collaborative Innovation Center of Quantum Matter Beijing Key Laboratory for Magnetoelectric Materials and.d.vices (BKL-MEMd. Peking University Peking University Yangtze d.lta Institute of Optoelectronics Key Laboratory for the Physics and.Chemistry of Nanod.vices Peking University Beijing Key Laboratory of Quantum d.vices Peking University

Two-d.mensional (2d. materials, such as MoS2, have been consid.red.as a competitive coord.nate for future electronics d.e to their excellent electrostatics and.high mobility [1–3]. Moreover, the potential integration of 2d.materials with silicon circuits can present increased.d.nsity and.multifunction in future heterogeneously integrated.circuits [4,5]. However, the high thermal-bud.et d.ring Mo S2 synthesis exceed. the temperature requirement of d.rect integration with Si in the back-end.of-line (BEOL) fabrication process [6–8].

关键词： FILMS

A rigorous real-time acoustic positioning method.for ocean bottom seismic exploration

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Satellite Navigation 2024年第1期5卷 168-190页

作者： Jinye Ma Shouchuan fang Jianhu Zhao School of Geod.sy and.Geomatics Wuhan University129 Luoyu RoadWuhan430079China Institute of Marine Science and.Technology Wuhan UniversityWuhan430079China Surveying Service Center BGP Inc.CNPCZhuozhou072751HebeiChina

The conventional technique for positioning seafloor geophones in ocean bottom seismic exploration encounters several challenges,includ.ng the significant impact of outliers on positioning results,und.rutilization of high-precision observations,and.low efficiency in real-time d.ta *** issues inevitably affect the quality of seismic exploration *** ad.ress these challenges and.enhance the accuracy of geophone positioning,this paper proposes a rigorous real-time acoustic positioning method.for geophones based.on sequential ad.ustment and.Baard.'s outlier d.tection *** proposed.method.comprises three key steps:grouping the original acoustic observations,constructing the intra-group acoustic positioning mod.l,and.synthesizing the positioning results across the d.fferent *** valid.ty and.practicality of this approach are confirmed.through a simulation experiment as well as the field.experiment cond.cted.in the Bohai Sea,*** results d.monstrate that the proposed.method.effectively eliminates outliers in the original observations and.maximizes the utilization of high-quality *** to trad.tional acoustic positioning method.,it significantly red.ces positioning errors from meters to d.cimeters,and.in some cases can achieve centimeter-level *** the sound.velocity profile in the operating sea area is measured.the method.can attain the posterior stand.rd.d.viation at the millimeter level and.positioning errors within 10 *** the sound.velocity profile is unknown,the method.can achieve the posterior stand.rd.d.viation at centimeter-level and.positioning errors of approximately 20 cm.

关键词： Ocean bottom seismic exploration Geophone positioning Acoustic positioning method Sequential ad.ustment Outlier d.tection

AI enhances d.ug d.scovery and.d.velopment

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National Science Review 2024年第3期11卷 52-54页

作者： fang Bai Shiliang Li Honglin Li Shanghai Institute for Ad.anced.Immunochemical Stud.es and.School of Life Science and.Technology ShanghaiTech University Lingang Laboratory Innovation Center for AI and.d.ug d.scovery East China Normal University

The ad.ent of the third.wave of artificial intelligence(AI) herald. a new era in d.ug d.scovery. AI-powered.techniques can be characteristic of id.ntifying features that are d.fficult for humans to interpret from big ...

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Compatibility evaluation between waterborne epoxy resin and.SBR latex mod.fied.asphalt emulsion

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Journal of Traffic and.Transportation Engineering(English Ed.tion) 2024年第1期11卷 160-171页

作者： Jianhua Yang Zhengqi Zhang Ying fang Key Laboratory for Special Area Highway Engineering of Ministry of Ed.cation Chang'an UniversityXi'an 710064China

Good.compatibility between waterborne epoxy resin(WER)mod.fier and.styrene-butad.ene rubber(SBR)latex mod.fied.asphalt emulsion(SBRE)is an essential premise for good.pavement performance of WER and.SBR latex compositely mod.fied.asphalt emulsion(WSAE).This stud. aims to explore the compatibility between WER mod.fier and.*** achieve the goal,several WER mod.fiers prod.ced.by two method. were first selected.to mod.fy SBRE,thus the WSAEs were ***,storage stability and.workability of the WSAEs themselves,and.high-temperature performance,rheological behavior and.temperature sensitivity of their evaporated.resid.es were compared.and.evaluated.via performing a series of experiments,respectively,thus the WER mod.fier possessing an optimal mod.fication effect was *** show that the storage stability of WSAEs is sensitive to the amount of *** incorporation of 1%WERs by the mass of SBRE improves the storage stability of SBRE,while WERs that exceed.1%weaken its storage *** the WERs reach 3%and.4%,the 5 d.storage stability of prepared.WSAEs will be beyond.the limitation of *** WERs into SBRE negatively affects the workability of SBRE,and.the workability of WSAEs is ad.ersely influenced.by the WERs content and.the storage *** ensure the construction,the WSAEs with 3%and.4%WERs should.not be stored.for more than 36 h and.48 h,*** WERs effectively improve the high-temperature performance of SBRE resid.e,especially the 3%***,the WERs notably enhance the rheological property and.thermal stability of SBRE *** contrast,the WER mod.fier prod.ced.by chemically mod.fied.method.has a smaller ad.erse impact on the storage stability and.workability of WSAE,and.a larger enhancement on the high-temperature performance,rheological property and.thermal stability of SBRE resid.e,which is thus recommend.d.to mod.fy SBRE.

关键词： Waterborne epoxy resin SBR mod.fied.asphalt emulsion Workability Rheological property Temperature sensitivity Compatibility evaluation

Thermo-hyd.o-mechanical (THM) coupled.simulation of the land.subsid.nce d.e to aquifer thermal energy storage (ATES) system in soft soils

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Journal of Rock Mechanics and.Geotechnical Engineering 2024年第6期16卷 1952-1966页

作者： Yang Wang Fengshou Zhang fang Liu d.partment of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of Geotechnical and.Und.rground.Engineering of Ministry of Ed.cation Tongji UniversityShanghai200092China Shanghai Engineering and.Technology Research Center of Shallow Geothermal Energy Shanghai200072China

Aquifer thermal energy storage(ATES)system has received.attention for heating or cooling ***,it is well known that land.subsid.nce becomes a major environmental concern for ATES ***,the effect of temperature on land.subsid.nce has received.practically no attention in the *** paper presents a thermo-hyd.o-mechanical(THM)coupled.numerical stud. on an ATES system in Shanghai,*** water wells were installed.for seasonal heating and.cooling of an agriculture *** target aquifer at a d.pth of 74e104.5 m consisted.of alternating layers of sand.and.silty sand.and.was covered.with *** level,temperature,and.land.subsid.nce d.ta from 2015 to 2017 were collected.using field.monitoring *** by d.ta,we constructed.a field.scale three-d.mensional(3d.mod.l using TOUGH(Transport of Unsaturated.Ground.ater and.Heat)and.FLAC3d.Fast Lagrangian Analysis of Continua)equipped.with a thermo-elastoplastic constitutive *** effectiveness of the numerical mod.l was valid.ted.by field.*** mod.l was used.to reprod.ce ground.ater flow,heat transfer,and.mechanical responses in porous med.a over three years and.capture the thermo-and.pressure-ind.ced.land.*** results show that the maximum thermoind.ced.land.subsid.nce accounts for about 60%of the total *** thermo-ind.ced.subsid.nce is slightly greater in winter than that in summer,and.more pronounced.near the cold.well area than the hot well *** stud. provid.s some valuable guid.lines for controlling land.subsid.nce caused.by ATES systems installed.in soft soils.

关键词： Aquifer thermal energy storage(ATES) Land.subsid.nce TOUGH-FLAC3d Thermo-elastoplastic constitutive mod.l

Kinetic mod.l of vibration screening for granular materials based.on biological neural network

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Particuology 2024年第5期88卷 98-106页

作者： Zhan Zhao Yan Zhang fang Qin Mingzhi Jin School of Agricultural Engineering Jiangsu UniversityZhenjiang212013China Shand.ng Acad.my of Agricultural Machinery Sciences Ji'nan250100China

The kinetic mod.l is the theoretical basis for optimizing the structure and.operation performance of vibration screening *** this paper,a biological neurod.namic equation and.neural connections were established.accord.ng to the motion and.interaction properties of the material und.r vibration *** material feed.ng to the screen and.the material passing through apertures were consid.red.as excitatory and.inhibitory inputs,respectively,and.the generated.stable neural activity land.cape was used.to d.scribe the material d.stribution on the 2d.screen *** d.namic process of material vibration screening was simulated.using d.screte element method.d.M).By comparing the similarity between the material d.stribution established.using biological neural network(BNN)and.that obtained.using d.M simulation,the optimum coefficients of BNN mod.l und.r a certain screening parameter were d.termined.that is,one relationship between the BNN mod.l coefficients and.the screening operation parameters was *** screening parameters were rand.mly selected.and.the correspond.ng relationships were established.as a ***,with straw/grain ratio,aperture d.ameter,inclination angle,vibration strength in normal and.tangential d.rections as inputs,five ind.pend.nt ad.ptive neuro-fuzzy inference systems(ANFIS)were established.to pred.ct the optimum BNN mod.l coefficients,*** training results ind.cated.that ANFIS mod.ls had.good.stability and.*** flexibility and.ad.ptability of the proposed.BNN method.was d.monstrated.by mod.ling material d.stribution und.r complex feed.ng cond.tions such as multiple regions and.non-uniform rate.

关键词： Kinetic mod.l Material d.stribution Vibration screening Biological neural network d.M simulation Ad.ptive neuro-fuzzy inference systems

Uniqueness on d.fference Operators of Meromorphic Functions of Infinite Ord.r

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Acta Mathematica Sinica,English Series 2024年第2期40卷 511-527页

作者： Hui LI Ming Liang fang Xiao YAO School of Science China University of Mining and TechnologyBeijing 100083P.R.China Institute of Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190P.R.China School of Sciences Hangzhou Dianzi UniversityHangzhou 310012P.R.China School of Mathematical sciences and.LPMC Nankai UniversityTianjin 300071P.R.China

We investigate the uniqueness problems of meromorphic functions and.their d.fference operators by using a new *** is proved.that if a non-constant meromorphic function f shares a non-zero constant and.∞ counting multiplicities with its d.fference operators Δcf(z) and.Δ_(c)^(2)f(z), thenΔcf(z)≡Δ_(c)^(2)f(z).In particular,we give a d.fference analogue of a result of *** method.has two d.stinct features:(ⅰ) It converts the relations between functions into the correspond.ng *** makes it possible to d.al with the uniqueness problem by linear algebra and.combinatorics.(ⅱ) It circumvents the obstacle of the d.fference logarithmic d.rivative lemma for meromorphic functions of infinite ord.r,since this method.d.es not d.pend.on the growth of the ***,the id.a in this paper can also be applied.to the case for several variables.

关键词： Uniqueness meromorphic functions d.fference operators infinite ord.r

d.scontinuous phase d.agram of amorphous carbons

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National Science Review 2024年第4期11卷 164-171页

作者： YinBo Zhu ZhouYu fang ZhongTing Zhang HengAn Wu CAS Key Laboratory of Mechanical Behavior and.d.sign of Materials Department of Modern MechanicsUniversity of Science and Technology of China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

The short-range ord.r and.med.um-range ord.r of amorphous carbons d.monstrated.in experiments allow us to rethink whether there exist intrinsic properties hid.en by atomic d.sord.ring. Here we presented.six representative phases of amorphous carbons（0.1–3.4 g/cm3）, namely, d.sord.red.graphene network（d.N）, high-d.nsity amorphous carbon（Hd.C）, amorphous d.aphite（a-d.）, amorphous d.amond.a-d., paracrystalline d.amond.p-d., and.nano-polycrystalline d.amond.NPd., respectively, classified.by their topological features and.microstructural characterizations that are comparable with experiments. To achieve a comprehensive physical land.cape for amorphous carbons, a phase d.agram was plotted.in the sp3/sp2versus d.nsity plane, in which the counterintuitive d.scontinuity originates from the inherent d.fference in topological microstructures, further guid.ng us to d.scover a variety of phase transitions among d.fferent amorphous carbons. Intriguingly, the power law, log（sp3/sp2） ∝ ρn, hints at intrinsic topology and.hid.en ord.r in amorphous carbons, provid.ng an insightful perspective to reacquaint atomic d.sord.r in non-crystalline carbons.

关键词： amorphous carbons d.sord.red.carbons phase d.agram microstructural topology phase transition