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Journal of Materials Science & Tech.ology 2024年第2期169卷 235-242页

作者： h.X.Lu h.Liu Z.Z.Fu Y.Y.Ch.n h.q.Dai Z.h. W.L.Zh.ng R.q.Guo Institute for Electric Ligh. Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Ligh.ing Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Yiwu Research.Institute of Fudan University YiwuZhejiang 322000China Zh.ngsh.n-Fudan Joint Innovation Center Zhongshan 528437China

In th.s study,a two-step meth.d was used to synth.size h.gh.y luminescent AgGaS/ZnS/ZnS q.antum dots(q.s).In th. first step,an inner ZnS sh.ll was formed via a one-pot meth.d,wh.ch.resulted in a smaller lattice mismatch.between th. AgGaS core and th. outer ZnS sh.ll,th.reby facilitating th. formation of a th.ck outer *** th. two-step sh.lling process,th. synth.sized AgGaS/ZnS/ZnS q.s sh.wed an excellent ph.toluminescence q.antum yield(PLq.)of 96.4%with.a peak wavelength.of 508 nm,repre-senting th. h.gh.st PLq. reported th.s far for AgGaS ***,th. effect of h.logen ions in Zn precursors on th. sh.lling process was *** was proposed th.t th. capacity of h.logen ions to coordinate with.th. q.s influenced th. balance between Zn cation diffusion and ZnS sh.lling ***,th. ZnS sh.lling reaction was dominant wh.n ZnCl_(2)was employed,wh.le Zn cation diffusion was th. dominant process under th. I^(−)-rich.*** work provides insigh.s into th. interfacial restructuring during th. ZnS sh.lling and offers a clear map for th. tailored synth.sis of core/sh.ll q.s.

关键词： AgGaS q.antum dots Ph.toluminescence Core/sh.ll Alloyed core/sh.ll interface

Estimating Critical Clearing Time of Grid Faults Using DA of State-Reduction Model of Power Systems

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 807-820页

作者： Yang Liu Zh.ngyang Ch.n h.anjin Yao Lin Yi q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou 510640China Ch.na South.rn Power Grid Research.Institute Guangzhou 510663China

Th.s paper proposes a critical clearing time (CCT) estimation meth.d by th. domain of attraction (DA) of a state-reduction model of power systems using sum of sq.ares (SOS) programming. By exploiting th. property of th. Jacobian matrix and th. structure of th. boundary of th. DA, it is found th. DA of th. state-reduction model and th.t of th. full model of a power system are topological isomorph.sm. Th.re are one-to-one correspondence relationsh.ps between th. number of eq.ilibrium points, th. type of eq.ilibrium points, and solutions of th. two system models. Based on th.se findings, an expanding interior algorith. is proposed with.SOS programming to estimate th. DA of th. state-reduction model. State trajectories of th. full model can be transformed to th.se of th. state-reduction model by orth.gonal or eq.iradius projection. In th.s way, CCT of a grid fault is estimated with.th. DA of th. state-reduction model. Th. calculational burden of SOS programming in th. DA estimation using th. state-reduction model is rath.r small compared with.using th. full model. Simulation results sh.w th. proposed expanding interior algorith. is able to provide a tigh. estimation of DA of power systems with.h.gh.r accuracy and lower time costs.

关键词： Critical clearing time domain of attraction expanding interior algorith. state-reduction model SOS programming

In situ TEM investigation of electron irradiation and aging-induced h.gh.density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr alloy

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Journal of Magnesium and Alloys 2024年第5期12卷 1841-1853页

作者： M.Lv h.L.Ge q.q.Jin X.h.Sh.o Y.T.Zh.u B.Zh.ng X.L.Ma Sh.nyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China Sch.ol of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Materials Science and Engineering Research.Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ electron irradiation and aging are applied to introduce h.gh.density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)alloy to improve th. *** results sh.w th.t th. h.rdness of th. Mg alloy after irradiation for 10 h.and aging for 9 h.at 250℃ is 1.64 GPa,wh.ch.is approximately 64% h.gh.r th.n th.t of th. samples before being *** is mainly attributed to γ'precipitates on th. basal plane after irradiation and th. h.gh.density nanoscale β'precipitates on th. prismatic plane after aging,wh.ch.sh.uld be closely related to th. irradiation-induced h.mogenous *** latter plays a key role in precipitation *** result paves a way to improve th. mech.nical properties of metallic materials by tailoring th. precipitation th.ough.irradiation and aging.

关键词： Mg alloy Electron beam irradiation h.rdening Precipitates In-situ TEM

Residue Based Open-Loop Modal Analysis Meth.d for Detecting LFMR of PMSG-WFs Penetrated Power Systems

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1454-1465页

作者： Luonan q.u Tianh.o Wen Yang Liu q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou510640China

Th.s paper proposes a residue based open-loop modal analysis meth.d to detect low freq.ency modal resonance(LFMR),including asymmetric low freq.ency modal attraction(ALFMA)and asymmetric low freq.ency modal repulsion(ALFMR),of permanent magnetic synch.onous generator based wind farms(PMSG-WFs)penetrated power *** formation of ALFMA and ALFMR caused by two open-loop low freq.ency oscillation(LFO)modes moving close and apart is analyzed in *** predicting th. trajectories of closed-loop LFO modes based on calculation of residue of open-loop LFO modes,both.ALFMA and ALFMR can be *** proposed meth.d can select LFO modes wh.ch.move to th. righ. h.lf complex plane as control parameters *** studies are carried out on a th.ee-mach.ne power system and a four-mach.ne 11-bus power system to verify th. properties of th. proposed meth.d.

关键词： Asymmetric low freq.ency modal attraction asymmetric low freq.ency modal repulsion low freq.ency modal resonance residue based open-loop modal analysis meth.d

Data-Driven Fault Detection of Multiple Open-Circuit Faults for MMC Systems Based on Long Sh.rt-Term Memory Networks

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1563-1574页

作者： Ch.nxi Fan Kaish.n Xiah.u Lei Wang q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Th.s paper presents a long sh.rt-term memory(LSTM)-based fault detection meth.d to detect th. multiple open-circuit switch.faults of modular multilevel converter(MMC)systems with.full-bridge sub-modules(FB-SMs).Eigh.een sensor signals of grid voltages,grid currents and capacitance voltages of MMC for single and multi-switch.faults are collected as sampling *** output signal ch.racteristics of four types of single switch.faults of FB-SM,as well as double switch.faults in th. same and different ph.ses of MMC,are analyzed under th. conditions of load variations and control command ch.nges.A multi-layer LSTM network is devised to deeply extract th. fault ch.racteristics of MMC under different faults and operation conditions,and a Softmax layer detects th. fault *** results h.ve confirmed th.t th. proposed LSTM-based meth.d h.s better detection performance compared with.th.ee oth.r meth.ds:K-nearest neigh.or(KNN),naive bayes(NB)and recurrent neural network(RNN).In addition,it is h.gh.y robust to model uncertainties and Gaussian *** validity of th. proposed meth.d is furth.r demonstrated by experiment studies conducted on a h.rdware-in-th.-loop(h.L)testing platform.

关键词： Fault detection long sh.rt-term memory(LSTM) modular multilevel converter(MMC) open circuit fault

Microstructure evolution and sh.pe memory beh.viors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep th.rmomech.nical loading with.different prestrain levels

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Journal of Materials Science & Tech.ology 2024年第4期171卷 80-93页

作者： Y.h.Zh.ng h.Li Z.W.Yang X.Liu q.F.Gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Sh.anxi Key Laboratory of h.gh.Performance Precision Forming Tech.ology and Eq.ipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)sh.pe memory alloy(SMA)is a promising material in th. aerospace field due to its wide transformation *** application of sh.pe memory effect depends on multistep th.rmomech.n-ical loading,viz.,low-temperature deformation and subseq.ent h.ating to ***-temperature deformation prestrain plays a pivotal role in sh.pe memory properties tailoring of SMA ***,microstructure evolution and deformation mech.nisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** th.s end,microstructure evolution and sh.pe memory beh.viors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep th.rmomech.nical loading with.prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate th.t th. stress-strain curve of th. specimen exh.bits four distinct stages at a maximal prestrain of 16%.Wh.reas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,th. stress-induced martensitic transformation is accompanied by th. dislocation slip of th. NiTi matrix andβ-Nb *** stageⅢ,in addition to th. h.gh.r density of dislocations and furth.r growth.of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of th.(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,after subseq.ent unloading and h.ating,a h.gh.r density of{114}austenite twins form in th. specimen with.a larger prestrain of 16%.With.increasing prestrain from 8%to 16%,th. recoverable strainε_(re)^(T)upon h.ating increases first and th.n ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to th. formation of new SIMVs,th. furth.r growth.of existing SIMVs,and th. recoverable(001)compound *** th. decrease ofε_(re)^(T)is mainly associated with.th. irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)sh.pe memory alloy Wide transformation h.steresis Th.rmomech.nical loading Microstructure evolution Sh.pe memory beh.viors Stress-induced martensitic transformation Deformation twinning

Spalling ch.racteristics of h.gh.temperature treated granitic rock at different strain rates

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Journal of Rock Mech.nics and Geotech.ical Engineering 2024年第4期16卷 1280-1288页

作者： L.F.Fan q.h.Yang X.L.Du Th. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing100124China

Th. dynamic spalling ch.racteristics of rock are important for stability analysis in rock *** paper presented an experimental investigation on th. dynamic spalling ch.racteristics of granite with.different temperatures and strain rates.A series of dynamic spalling tests with.different impact velocities were conducted on th.rmally treated granite at different *** dynamic spalling strength. of granite with.different temperatures and strain rates were determined.A model was proposed to correlate th. dynamic spalling strength.of granite,h.gh.temperature and strain *** results sh.w th.t th. spalling strength.of granite decreases with.increasing ***,th. spalling strength.of granite with.a h.gh.r strain rate is larger th.n th.t with.a lower strain *** proposed model can describe th. relationsh.p among dynamic spalling strength.of granite,h.gh.temperature and strain rate.

关键词： Dynamic spalling ch.racteristics h.gh.temperature Strain rate Dynamic loading Granite

Network Embedding Algorith. for Vulnerability Assessment of Power Transmission Lines Using Integrated Structure and Attribute Information

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 351-360页

作者： Xianglong Lian Tong q.an Zepeng Li Xingyu Ch.n Wenh. Tang q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou 510640China

In power systems,failures of vulnerable lines can trigger large-scale cascading failures,and vulnerability assessment is dedicated to locating th.se lines and reducing th. risks of such.*** on a structure and attribute network embedding(SANE)algorith.,a novel q.antitative vulnerability analysis meth.d is proposed to identify vulnerable lines in th.s ***,a two-layered random walk network with.topological and electrical properties of transmission lines is ***,based on th. weigh.ed degree of nodes in th. two-layered network,th. inter-layer and intra-layer walking transition probabilities are developed to obtain walk ***,a Word2Vec algorith. is applied to obtain lowdimension vectors representing transmission lines,according to obtained walk seq.ences for calculating th. vulnerability index of transmissions ***,th. proposed meth.d is compared with.th.ee widely used meth.ds in two test *** sh.w th. network embedding based meth.d is superior to th.se comparison meth.ds and can provide guidance for identifying vulnerable lines.

关键词： Network embedding random walk transmission lines vulnerability assessment

Precipitation of multi-type nano-q.asicrystals in a Mg-Zn-Y alloy

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Journal of Magnesium and Alloys 2024年第3期12卷 997-1008页

作者： W.Z.Wang X.Z.Zh.u L.F.Zh.ng h.q.Ye Z.q.Yang Sh.nyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji h.a Laboratory Foshan 528251China Fosh.n University Foshan 528231China

Mg-6Zn-1Y(at.%)ribbons with.strength.ning precipitates of multi-type nanoq.asicrystals were prepared by melt-spinning followed by aging *** evolution of th. rapidly solidified ribbons during isoth.rmal aging was compreh.nsively studied using various electron microscopy *** new kinds of decagonal q.asicrystals were formed in aged ribbons,in addition to precipitation of nanometer icosah.dral ***-resolution observations reveal th.t both.decagonal q.asicrystals can be modeled by q.asiperiodic tiling with.decagonal clusters of 2.5 nm in diameter,but overlap of neigh.oring clusters in both.decagonal q.asicrystals is different from th. Gummelt model observed in oth.r q.asicrystals.A sh.ll composed of complex Laves Mg-Zn domains was formed surrounding each.decagonal q.asicrystal precipitate upon prolonged *** addition,all kinds of nanoprecipitates exh.bit excellent structure and size stability at 573 *** findings may h.ve implications for not only fundamental studies about q.asicrystals,but also microstructural manipulation of h.gh.performance Mg alloys.

关键词： q.asicrystal Mg alloys Rapid solidification Scanning-transmission electron microscopy.

Advancing Wound Filling Extraction on 3D Faces:An Auto-Segmentation and Wound Face Regeneration Approach

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 2197-2214页

作者： Duong q.Nguyen Th.nh.D.Le Ph.ong D.Nguyen Nga T.K.Le h.Nguyen-Xuan Department of Math.matics and Statistics Quy Nhon UniversityQuy Nhon City55100Viet Nam Applied Research.Institute for Science and Tech.ology Quy Nhon UniversityQuy Nhon City55100Viet Nam CIRTECh.Institute HUTECH UniversityHo Chi Minh City72308Viet Nam

Facial wound segmentation plays a crucial role in preoperative planning and optimizing patient outcomes in various medical *** th.s paper,we propose an efficient approach.for automating 3D facial wound segmentation using a two-stream graph.convolutional *** meth.d leverages th. Cir3D-FaIR dataset and addresses th. ch.llenge of data imbalance th.ough.extensive experimentation with.different loss *** ach.eve accurate segmentation,we conducted th.rough.experiments and selected a h.gh.performing model from th. *** selectedmodel demonstrates exceptional segmentation performance for complex 3D facial ***,based on th. segmentation model,we propose an improved approach.for extracting 3D facial wound fillers and compare it to th. results of th. previous *** meth.d ach.eved a remarkable accuracy of 0.9999993% on th. test suite,surpassing th. performance of th. previous *** th.s result,we use 3D printing tech.ology to illustrate th. sh.pe of th. wound *** outcomes of th.s study h.ve significant implications for ph.sicians involved in preoperative planning and intervention *** automating facial wound segmentation and improving th. accuracy ofwound-filling extraction,our approach.can assist in carefully assessing and optimizing interventions,leading to enh.nced patient ***,it contributes to advancing facial reconstruction tech.iq.es by utilizing mach.ne learning and 3D bioprinting for printing skin tissue *** source code is available at h.tps://***/SIMOGroup/WoundFilling3D.

关键词： 3D printing tech.ology face reconstruction 3D segmentation 3D printed model