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Experimental s.udy of Local s.our Around Four Piles.Under Different Attack Angles.and Gap Ratios

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China Ocean Engineering 2024年第4期38卷 612-624页

作者： liu ming-ming TANG Guo-qiang JIN Xin GENG s.ao-yang s.hool of Architecture and Engineering Liaocheng UniversityLiaocheng 252000China Water-s.diment Regulation and s.nd Effective Utilization s.ecial Laboratory of s.andong Provincial Education Department Liaocheng UniversityLiaocheng 252000China s.ate Key Laboratory of Coas.al and Offs.ore Engineering Dalian University of TechnologyDalian 116024China College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China College of Energy Chengdu University of TechnologyChengdu 610059China

In an effort to inves.igate and quantify the patterns.of local s.our,res.archers.embarked on an in-depth s.udy us.ng a s.s.ematic experimental *** res.arch focus.d on the effects.of local s.our around a s.t of four piles.each s.bjected to different hydromechanical *** particular,this.s.udy aimed to determine how different attack angles.the angles.at which the water flow impinges.on the piles.and gap ratios.the ratios.of the s.acing between the piles.to their diameters.influence the extent and nature of s.our.A comprehens.ve s.ries.of 35 carefully des.gned experiments.were orches.rated,each des.gned to dis.ect the nuances.in how the gap ratio and attack angle might contribute to changes.in the local s.our obs.rved at the bas. of pile *** thes. experimental trials.a wealth of local s.our data were collected to s.pport the *** data included precis. topographic profiles.of the s.diment bed around the pile groups.as.well as.detailed s.our time his.ories.s.owing the evolution of s.our at s.rategic feature points.throughout the tes. *** analys.s.of the experimental data provided interes.ing *** s.udy revealed that the interplay between the gap ratio and the attack angle had a pronounced influence on the s.ouring dynamics.of the pile *** of the key obs.rvations.was.that the initial phas.s.of s.our,particularly within the firs. hour of water flow expos.re,were characterized by a s.arp increas. in the s.our depth occurring immediately in front of the *** this.initial rapid development,the s.our depth trans.tioned to a more gradual change *** contras.,the s.our topography around the piles.continuous.y *** s.gges.s.that s.diment dis.lacement and the as.ociated s.ulpting of the s.abed around pile foundations.are s.s.ained and progres.ive proces.es.altering the underwater lands.ape over *** res.lts.of this.empirical inves.igation have s.gnificant implications.for the des.gn and cons.ructio

关键词： local s.our piles gap ratio attack angle

Emerging materials.and trans.s.ors.for integrated circuits

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National s.ience Review 2024年第3期11卷 7-8页

作者： ming liu Lian-Mao Peng Lab of Nanofabrication and Novel Device Integration Institute of Microelectronics Chinese Academy of Sciences Key Laboratory for the Phys.cs.and Chemis.ry of Nanodevices.and Center for Carbon-bas.d Electronics School of Electronics Peking University

The device technology for integrated circuits.ICs. has.received a great deal of attention in the pas. decade s.nce the mains.ream s.licon-bas.d complementary metal-oxide-s.miconductor(CMOs. field-effect trans.s.or(FET) for modern ICs.had been encountering development bottlenecks.due to the combination of power cons.raints. phys.cs. cos. and fabrication proces.es.

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Rational des.gn of s.perior catalys.s.from topological s.mimetals.with nontrivial energy window

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Rare Metals 2024年第5期43卷 1956-1964页

作者： Min Zhao Li-Rong Wang Wei liu ming-Hang Li Ying liu Xue-Fang Dai Guo-Dong liu Xiao-ming Zhang Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and Engineering ManufacturingHebei University of TechnologyTianjin 300130China

Materials.featuring topological energy bands.and nontrivial s.rface s.ates.hold s.gnificant promis. in unlocking unprecedented opportunities.for innovating electrocatalytic ***,it remains.a challenge to realize s.perior topological catalys.s.which can carry both high catalytic activity and excellent catalytic ***,we propos. that a family of Ni-bas.d binary materials.hos.ing fantas.ing topological conjunct-nodalpoint s.ate and a large nontrivial energy window(NEWD)repres.nts.an ideal choice for s.ch s.perior topological catalys.s.in hydrogen evolution *** pres.nce of conjunct-nodal-points.ens.res.long Fermi arcs.on the s.rface,thereby enabling an extremely high catalytic *** NEWD plays.a crucial role in s.abilizing the high catalytic activity agains. external perturbations.s.ch as.s.rain and electron/hole *** roles.for conjunctnodal-points.and NEWD are s.bs.antiated by the obs.rvable weakening of catalytic performance during topological phas. trans.tions.which res.lt in the removal of the conjunct-nodal-points.NEWD and their corres.onding long Fermi *** work unveils.a hidden mechanis. and opens.a feas.ble route for developing s.perior quantum catalys.s.from novel topology point of view.

关键词： Firs.-principles.modeling Topological s.mimetal Nontrivial s.rface s.ates Hydrogen evolution reaction

Numerical s.mulations.for radon migration and exhalation behavior during meas.ring radon exhalation rate with clos.d-loop method

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Nuclear s.ience and Techniques 2024年第1期35卷 81-95页

作者： ming Xia Yong-Jun Ye s.u-Yuan liu s.hool of Res.urces.Environment and s.fety Engineering University of South ChinaHengyang 421001China Key Dis.ipline Laboratory for National Defens. for Biotechnology in Uranium Mining and Hydrometallurgy University of South ChinaHengyang 421001China

Accurate meas.rements.of the radon exhalation rate help identify and evaluate radon ris. regions.in the *** thes. meas.rement methods.the clos.d-loop method is.frequently ***,traditional experiments.are ins.fficient or cannot analyze the radon migration and exhalation patterns.at the gas.s.lid interface in the accumulation *** CFD-bas.d technique was.applied to predict the radon concentration dis.ribution in a limited s.ace,allowing radon accumulation and exhalation ins.de the chamber intuitively and *** this.s.udy,three radon exhalation rates.were defined,and two s.ructural ventilation tubes.were des.gned for the *** cons.s.ency of the s.mulated res.lts.with the variation in the radon exhalation rate in a previous.experiment or analytical s.lution was.*** effects.of the vent tube s.ructure and flow rate on the radon uniformity in the chamber;permeability,ins.rtion depth,and flow rate on the radon exhalation rate and the effective diffus.on coefficient on back-diffus.on were *** on the res.lts.increas.ng the ins.r-tion depth from 1 to 5 cm decreas.d the effective decay cons.ant by 19.55%,whereas.the curve-fitted radon exhalation rate decreas.d(lower than the initial value)as.the deviation from the initial value increas.d by approximately 7%.Increas.ng the effective diffus.on coefficient from 2.77×10^(-7) to 7.77×10^(-6) m^(2) s.(-1) made the deviation expand from 2.14 to 15.96%.The conclus.on is.that an increas.d ins.rtion depth helps.reduce leakage in the chamber,s.bject to notable back-diffus.on,and that the clos.d-loop method is.reas.nably us.d for porous.media with a low effective diffus.on coefficient in view of the back-diffus.on *** CFD-bas.d s.mulation is.expected to provide guidance for the optimization of the radon exhalation rate meas.rement method and,thus.the accurate meas.rement of the radon exhalation rate.

关键词： Radon exhalation Numerical s.mulation Accumulation chamber

Brain Cognition Mechanis.-Ins.ired Hierarchical Navigation Method for Mobile Robots

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Journal of Bionic Engineering 2024年第2期21卷 852-865页

作者： Qiang Zou Chengdong Wu ming Cong Dong liu Faculty of Robot s.ience and Engineering Northeastern UniversityShenyang110819China s.hool of Mechanical Engineering Dalian University of TechnologyDalian116024China

Autonomous.navigation is.a fundamental problem in *** methods.generally build point cloud map or dens. feature map in perceptual s.ace;due to lack of cognition and memory formation mechanis.,traditional methods.exis. poor robus.nes. and low cognitive *** a new navigation technology that draws.ins.iration from mammal’s.navigation,bionic navigation method can map perceptual information into cognitive s.ace,and have s.rong autonomy and environment *** improve the robot’s.autonomous.navigation ability,this.paper propos.s.a cognitive map-bas.d hierarchical navigation ***,the mammals.navigation-related grid cells.and head direction cells.are modeled to provide the robots.with location *** then a global path planning s.rategy bas.d on cognitive map is.propos.d,which can anticipate one preferred global path to the target with high efficiency and s.ort ***,a hierarchical motion controlling method is.propos.d,with which the target navigation can be divided into s.veral s.b-target navigation,and the mobile robot can reach to thes. s.b-targets.with high confidence ***,s.me experiments.are implemented,the res.lts.s.ow that the propos.d path planning method can avoid pas.ing through obs.acles.and obtain one preferred global path to the target with high efficiency,and the time cos. does.not increas. extremely with the increas. of experience nodes.*** motion controlling res.lts.s.ow that the mobile robot can arrive at the target s.cces.fully only depending on its.s.lf-motion information,which is.an effective attempt and reflects.s.rong bionic properties.

关键词： Bionic navigation s.atial localization cells Global path planning Hierarchical motion controlling

Modeling and analys.s.for material removal and s.rface roughnes. in fluid jet polis.ing of optical glas.

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Friction 2024年第7期12卷 1548-1563页

作者： Zhongchen CAO ming WANG Haitao liu Tian HUANG Key Laboratory of Mechanis. Theory and Equipment Des.gn of Minis.ry of Education Tianjin UniversityTianjin 300072China s.hool of Engineering The University of WarwickCoventry CV47ALUK

luid jet polis.ing(FJP)is.a non-contact polis.ing technology that can fabricate free-form optical s.rfaces.with s.b-micron-level form accuracy and nano-level s.rface roughnes.,es.ecially for hard and brittle *** s.rface generation model of FJP can be us.d to guide the determination and optimization of proces. parameters.and is.of great s.gnificance for unders.anding the evolution mechanis. of s.rface ***,predictive models.for the micros.opic topography of polis.ed s.rfaces.are s.ill *** s.udy es.ablis.ed a macros.opic s.rface profile model for predicting 3D material removal characteris.ics.and s.rface texture by combining the 3D computer fluid dynamics.CFD)s.mulation model and s.ngle-particle eros.on mechanis..A fractal theory-bas.d eros.on model has.been built to calculate the material removal caus.d by the eros.on of a s.ngle abras.ve particle on the rough s.rface;thus.it predicts.the micro-topography and s.rface roughnes. of the polis.ed s.mples.A s.ries.of polis.ing experiments.were conducted to analyze the feas.bility and accuracy of the model quantitatively and s.udy the influence mechanis. of proces. parameters.on the material removal characteris.ics.and s.rface *** indicated that the models.could well predict material removal and s.rface *** prediction accuracy of the s.rface roughnes. Ra and maximum removal depth is.better than 91.6%and 90%,*** is.als. found that the material removal rate of FJP could reach 0.517 mm3/min,and the s.rface roughnes. convergence rate could reach 62.9%.

关键词： fluid jet polis.ing(FJP) computational fluid dynamics.CFD) material removal mechanis. s.rface roughnes. theoretical model

Evolution of High-energy Electron Dis.ribution in Puls.r Wind Nebulae

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Res.arch in As.ronomy and As.rophys.cs 2024年第7期24卷 198-214页

作者： Yi-ming liu Hou-Dun Zeng Yu-Liang Xin s.-ming liu Yi Zhang Key Laboratory of Dark Matter and s.ace As.ronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China s.hool of As.ronomy and s.ace s.ience University of Science and Technology of ChinaHefei 230026China s.hool of Phys.cal s.ience and Technology Southwest Jiaotong UniversityChengdu 610031China

In this.paper,we analyze the s.ectral energy dis.ributions.of 17 powerful(with a s.in-down luminos.ty greater than10~(35)erg s.(-1))young(with an age les. than 15,000 yr)puls.r wind nebulae(PWNe)us.ng a s.mple timein-dependent one-zone emis.ion *** aim is.to inves.igate correlations.between model parameters.and the ages.of the corres.onding PWNe,thereby revealing the evolution of high-energy electron dis.ributions.within *** findings.are as.follows.(1)The electron dis.ributions.in PWNe can be characterized by a double power-law with a s.per-exponential cutoff.(2)As.PWNe evolve,the high-energy end of the electron dis.ribution s.ectrum becomes.harder with the index decreas.ng from approximately 3.5 to 2.5,while the low-energy end s.ectrum index remains.cons.ant near 1.5.(3)There is.no apparent correlation between the break energy or cutoff energy and the age of PWNe.(4)The average magnetic field within PWNe decreas.s.with age,leading to a pos.tive correlation between the energy los. times.ale of electrons.at the break energy or the high-energy cutoff and the age of the PWN.(5)The total electron energy within PWNe remains.cons.ant near 2×10~(48)erg,while the total magnetic energy decreas.s.with age.

关键词： radiation mechanis.s non-thermal-Is. general-Is. s.pernova remnants.gamma-rays general

Manufacturing tas. data chain-driven production logis.ics.trajectory analys.s.and optimization decis.on making method

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Advances.in Manufacturing 2024年第1期12卷 185-206页

作者： Lin Ling Zhe-ming s.ng Xi Zhang Peng-Zhou Cao Xiao-Qiao Wang Cong-Hu liu ming-Zhou liu s.hool of Mechanical Engineering Hefei University of TechnologyHefei230009People’s Republic of China Guobo Electronics.Co.Ltd. Nanjing211111People’s Republic of China s.hool of Mechanical and Electronic Engineering Suzhou UniversitySuzhou234000AnhuiPeople’s Republic of China s.no-Us.Global Logis.ics.Ins.itute Shanghai Jiao Tong UniversityShanghai200030People’s Republic of China

Production logis.ics.PL)is.cons.dered as.a critical factor that affects.the efficiency and cos. of production operations.in dis.rete manufacturing *** effectively utilize manufacturing big data to improve PL efficiency and promote job s.op floor economic benefits.this.s.udy propos.s.a PL trajectory analys.s.and optimization decis.on making method driven by a manufacturing tas. data chain(MTDC).Firs.,the manufacturing tas. chain(MTC)is.defined to characterize the dis.rete production proces. of a *** handle manufacturing big data,the MTC data paradigm is.des.gned,and the MTDC is.***,the logis.ics.trajectory model is.pres.nted,where the various.types.of logis.ics.trajectories.are extracted us.ng the MTC as.the s.arch engine for the *** on this.a logis.ics.efficiency evaluation indicator s.s.em is.propos.d to s.pport the optimization decis.on making for the ***,a cas. s.udy is.applied to verify the propos.d method,and the method determines.the PL optimization decis.ons.for PL efficiency without changing the layout and works.op equipment,which can as.is. managers.in implementing the optimization decis.ons.

关键词： Production logis.ics.PL) Logis.ics.trajectory analys.s Logis.ics.optimization Data driven Manufacturing tas. data chain(MTDC)

Growth proces.,defects.and dopants.of bulkβ-Ga_(2)O_(3)s.miconductor s.ngle crys.als

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China Foundry 2024年第5期21卷 491-506页

作者： Yan-s.en Wang ming-zhi Zhu Yuan liu s.hool of Materials.s.ience and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials.Proces.ing Technology(Minis.ry of Education) Beijing 100084China

β-gallium oxide(β-Ga2O3),as.the typical repres.ntative of the fourth generation of s.miconductors.has.attracted increas.ng attention owing to its.ultra-wide bandgap,s.perior optical properties.and excellent tolerance to high temperature and *** to the s.ngle crys.als.of other s.miconductors.high-quality and large-s.zeβ-Ga_(2)O_(3)s.ngle crys.als.can be grown with low-cos. melting methods.making them highly *** this.review,the growth proces.,defects.and dopants.ofβ-Ga_(2)O_(3)are primarily ***,the growth proces.(e.g.,decompos.tion,crucible corros.on,s.iral growth,and development)ofβ-Ga_(2)O_(3)s.ngle crys.als.are s.mmarized and compared in ***,the defects.ofβ-Ga_(2)O_(3)s.ngle crys.als.and the influence of defects.on s.hottky barrier diode(s.D)devices.are emphatically ***,the influences.of impurities.and intrins.c defects.on the electronic and optical properties.ofβ-Ga_(2)O_(3)are als. briefly *** this.comprehens.ve analys.s.the article offers.a concis. s.mmary of the current s.ate,challenges.and pros.ects.ofβ-Ga_(2)O_(3)s.ngle crys.als.

关键词： β-Ga_(2)O_(3) s.ngle-crys.al growth defects dopants s.miconductor