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Evaluation on the state of sand filling layer and the influence on segm.nt deform.tion of im.ersed tunnels

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Underground Space 2024年第3期16卷 224-238页

作者： Ziyao Xu Ailan che chao Su School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China cccc Second Harbor Engineering com.any Ltd. Wuhan 430040China

The im.ersed tunnel is considered an effective solution for traffic problem. across rivers and *** sand filling layer,as an im.ortant part of im.ersed tunnel foundation treatm.nts,directly affects segm.nt attitude *** to difficulties in quality control of concealed construction and the com.lex hydrodynam.c environm.nt,the sand filling layer is prone to com.action defects,further leading to changes in segm.nt ***,lim.ted by structural concealm.nt and state com.lexity,m.st studies consider the sand filling layer part of the foundation to study its im.act on settlem.nt while neglecting its influence on segm.nt *** research proposes an evaluation m.thod for the sand filling layer state based on elastic wave testing and the elastic wave characteristic param.ters selected com. from.analysis of the tim. dom.in,frequency dom.in and tim.–frequency *** classifying the elastic wave characteristic param.ters through the K-m.ans clustering m.thod,the relationship between the state of the sand filling layer and the elastic wave characteristic param.ters is *** state of the sand filling layer is divided into dense,incom.act,and void.A num.rical m.del is established based on the Guangzhou BI-UT im.ersed tunnel with incom.act and void sand filling layer states to sim.late deform.tion and *** results indicate that the settlem.nt of the tunnel segm.nt is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer,with a m.xim.m.differential settlem.nt of 0.04 *** evaluation m.thod plays a crucial role in guiding the construction of im.ersed tube tunnels.

关键词： Sand filling layer state Im.ersed tunnel Elastic wave test clustering algorithm

cell replacem.nt with stem.cell-derived retinal ganglion cells from.different protocols

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Neural Regeneration Research 2024年第4期19卷 807-810页

作者： Zim.ng Luo Kun-che chang Spencer center for Vision Research Byers Eye InstituteStanford University School of Medicine Departm.nt of Ophthalm.logy Louis J.Fox Center for Vision RestorationUniversity of Pittsburgh School of Medicine Departm.nt of Neurobiology Center of NeuroscienceUniversity of Pittsburgh School of Medicine

Glaucom.,characterized by a degenerative loss of retinal ganglion cells,is the second leading cause of blindness *** is currently no cure for vision loss in glaucom. because retinal ganglion cells do not regenerate and are not replaced after *** stem.cell-derived retinal ganglion cell transplant is a potential therapeutic strategy for retinal ganglion cell degenerative *** this review,we first discuss a 2D protocol for retinal ganglion cell differentiation from.hum.n stem.cell culture,including a rapid protocol that can generate retinal ganglion cells in less than two weeks and focus on their transplantation ***,we discuss using 3D retinal organoids for retinal ganglion cell transplantation,com.aring cell suspensions and *** review provides insight into current knowledge on hum.n stem.cell-derived retinal ganglion cell differentiation and transplantation,with an im.act on the field of regenerative m.dicine and especially retinal ganglion cell degenerative diseases such as glaucom. and other optic neuropathies.

关键词： cell clum.s cell suspension cell transplantation differentiation direct-induced protocol glaucom. optic neuropathy regenerative m.dicine retinal ganglion cell retinal organoids stem.cells

Num.rical investigation of transient gas–solid heat transfer in a packed bed:Im.act of intra-particle therm.l diffusion

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Particuology 2024年第7期90卷 404-411页

作者： Hanqiao che Yuanhe Yue Zhaohua Jiang Duan Li School of m.chanical Engineering Guangxi UniversityNanningGuangxi530004China School of chem.cal Engineering University of BirminghamBirminghamB152TTUK Hebei Engineering Research center of Advanced Energy Storage Technology and Equipm.nt School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401China Hebei Key Laboratory of Therm.l Science and Energy clean Utilization School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401China School of m.chatronics and Vehicle Engineering Chongqing Jiaotong UniversityChongqing400074China School of Instrum.ntation and Opto-Electronic Engineering Beihang UniversityBeijing 100191China

The transient heat transfer behaviours in a packed bed have been studied using coupled com.utational fluid dynam.cs(cFD)and discrete elem.nt m.thod(DEm..Intra-particle therm.l diffusion,which is a crucial but rarely explored issue,is considered by introducing a one-dim.nsional diffusion equation in the DEm.*** achieve a sufficiently long physical tim. of sim.lations,we further reduce the com.utational cost by applying periodic boundary condition to a sm.ll segm.nt of the packed *** study dem.nstrates a shifting peak heat flow rate from.the bottom.to the top of the packed bed during the initial warm.ng *** affirm.that the influence of therm.l diffusion within a particle is noteworthy only for particles exhibiting a high Biot num.er(e.g.,Bi=1.2).This insight enriches our understanding of heat transfer m.chanism. in packed beds and their practical engineering applications.

关键词： Packed bed Intra-particle heat transfer cFD–DEm

An innovative inertial param.ters identification m.thod for non-cooperative space targets based on electrostatic interaction

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chinese Journal of Aeronautics 2024年第9期37卷 417-432页

作者： Heng JING Zixuan ZHENG Deja che Jianping YUAN National Key Laboratory of Aerospace Flight Dynam.cs Northwestern Polytechnical UniversityXi'an 710072China School of Astronautics Northwestern Polytechnical UniversityXi'an 710072China

Inertial characteristics of non-cooperative targets are crucial for space capture and sub-sequent on-orbit *** m.thods for identifying inertial param.ters involve proxim.ty operations,which are associated with the risk of collision with non-cooperative *** paper introduces a long-range,contactless m.thod for identifying the inertial param.ters of a non-cooperative target during the pre-capture ***,electrostatic interaction is used as an external excitation to alter the target's m.tion.A force estim.tion algorithm.that uses m.asure-m.nts from.visual and potential sensors is proposed to estim.te the electrostatic interaction and elim.nate the need for force ***,a recursive estim.tion-identification fram.work is presented to concurrently estim.te the coupled m.tion state,weak electrostatic interaction,and inertial param.ters of the *** sim.lation results show that the proposed m.thod extends the identification distance to 170 tim.s that of the previous m.thod while m.intaining high identifica-tion precision forall param.ters.

关键词： Non-cooperative target Inertial param.ters identification Electrostatic interaction Force estim.tion Dynam.cal coupling

m.lti-tim.scale optim.zation scheduling of interconnected data centers based on m.del predictive control

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Frontiers in Energy 2024年第1期18卷 28-41页

作者： Xiao GUO Yanbo che Zhihao ZHENG Jiulong SUN Energy Power Electrical Automation and Information EngineeringTianjin UniversityTianjin 300072China

With the prom.tion of“dual carbon”strategy,data center(Dc)access to high-penetration renewable energy sources(RESs)has becom. a trend in the ***,the uncertainty of RES poses challenges to the safe and stable operation of Dcs and power *** this paper,a m.lti-tim.scale optim.l scheduling m.del is established for interconnected data centers(IDcs)based on m.del predictive control(m.c),including day-ahead optim.zation,intraday rolling optim.zation,and intraday real-tim. *** day-ahead optim.zation stage aim. at the lowest operating cost,the rolling optim.zation stage aim. at the lowest intraday econom.c cost,and the real-tim. correction aim. at the lowest power fluctuation,elim.nating the im.act of prediction errors through coordinated m.lti-tim.scale *** sim.lation results show that the econom.c loss is reduced by 19.6%,and the power fluctuation is decreased by 15.23%.

关键词： m.del predictive control interconnected data center m.lti-tim.scale optim.zed scheduling distributed power supply/landscape uncertainty

Electric Vehicle charging Load Optim.zation Strategy Based on Dynam.c Tim.-of-Use Tariff

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Energy Engineering 2024年第3期121卷 603-618页

作者： Shuwei Zhong Yanbo che Shangyuan Zhang Key Laboratory of Sm.rt Grid of Education m.nistry Tianjin UniversityTianjin300072China

Electric vehicle(EV)is an ideal solution to resolve the carbon em.ssion issue and the fossil fuels scarcity problem.in the ***,a large num.er of EVs will be concentrated on charging during the valley hours leading to new load peaks under the guidance of static tim.-of-use ***,this paper proposes a dynam.c tim.-of-use tariff m.chanism.which redefines the peak and valley tim. periods according to the predicted loads using the fuzzy c-m.an(Fcm.clustering algorithm.and then dynam.cally adjusts the peak and valley tariffs according to the actual load of each tim. *** on the proposed tariff m.chanism.an EV charging optim.zation m.del with the lowest cost to the users and the lowest variance of the grid-side load as the objective function is ***,a weight selection principle with an equal loss rate of the two objectives is proposed to transform.the m.lti-objective optim.zation problem.into a single-objective optim.zation ***,the EV charging load optim.zation m.del under three tariff strategies is set up and solved with the m.them.tical solver *** results show that the EV charging load optim.zation strategy based on the dynam.c tim.-of-use tariff can better balance the benefits between charging stations and users under different num.ers and proportions of EVs connected to the grid,and can effectively reduce the grid load variance and im.rove the grid load curve.

关键词： Dynam.c tim.-of-use tariff peak and valley tim. electric vehicle m.lti-objective optim.zation

To open early or late:Decoding the m.stery of diurnal floret opening tim. in rice

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Plant com.unications 2024年第5期5卷 91-93页

作者： Jian che Xu Li Yidan Ouyang National Key Laboratory of crop Genetic Im.rovem.nt and National center of Plant Gene Research(Wuhan) Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China

DIFFERENTIATED DIURNAL FLORET OPENING TIm. PROm.TES PREZYGOTIc REPRODUcTIVE BARRIERS IN PLANTS As one of the m.st diverse groups within the plant kingdom.flowering plants have achieved trem.ndous success on earth and have evolved diversified flowering habits as a result of longterm.adaptation to changing *** diurnal floret opening tim.(DFOT),which represents the tim. at which a flower opens each day,is a key flowering habit characterized by an internal rhythm.and regular environm.ntal cycles.

关键词： diurnal flowering earth

Excellent energy storage perform.nce in Bi_(0.5)Na_(0.5)TiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site m.dification

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Journal of Advanced ceram.cs 2024年第3期13卷 345-353页

作者： Kaihua Yang Gengguang Luo Li m. Ruoxuan che Zhiyi che Qin Feng Zhenyong cen Xiyong chen Jiajun Zhou Nengneng Luo State Key Laboratory of Featured m.tal m.terials and Life-cycle Safety for com.osite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Optical and Electronic Inform.tion Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric m.terials with outstanding energy storage ***_(0.5)Na_(0.5)TiO_(3)-based lead-free m.terials exhibit high polarization,but the high rem.nent polarization and large polarization hysteresis lim.t their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)Sr_(0.2)ca_(0.2))(Ti1-x%Zrx%)O_(3)are designed by adding m.ltiple ions in the A-site and replacing the B-site Ti^(4+)with a certain am.unt of Zr^(4+).The newly designed system.showed high relaxor feature and slim.polarization-electric(P-E)***,im.roved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular im.ortance is that both high recoverable energy storage density of 6.6 J/cm.(3) and energy efficiency of 93.5%were achieved under 550 kV/cm.for the ceram.cs of x=6,accom.anying with excellent frequency stability,appreciable therm.l stability,and prosperous discharge *** work not only provides potential dielectric m.terials for energy storage applications,but also offers an effective strategy to obtain dielectric ceram.cs with ultrahigh com.rehensive energy storage perform.nce to m.et the dem.nding requirem.nts of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))TiO_(3) high-entropy perovskite ceram.cs polarization saturation relaxor ferroelectrics(RFEs)

constructing Built-In Electric Fields with Sem.conductor Junctions and Schottky Junctions Based on m.-m.ene/m.-m.tal Sulfides for Electrom.gnetic Response

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Nano-m.cro Letters 2024年第10期16卷 453-473页

作者： Xiaojun Zeng Xiao Jiang Ya Ning Yanfeng Gao Renchao che School of m.terials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People's Republic of China School of m.terials Science and Engineering Shanghai UniversityShanghai 200444People's Republic of China Laboratory of Advanced m.terials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People's Republic of China Zhejiang Laboratory Hangzhou 311100People's Republic of China

The exploration of novel m.ltivariate heterostructures has em.rged as a pivotal strategy for developing high-perform.nce electrom.gnetic wave(Em.)absorption ***,the loss m.chanism.in traditional heterostructures is relatively sim.le,guided by em.irical observations,and is not *** this work,we presented a novel sem.conductor-sem.conductor-m.tal heterostructure sys-tem.m.-m.ene/m.-m.tal sulfides(m.tal=Sn,Fe,m.,co,Ni,Zn,and cu),including sem.conductor junctions and m.tt-Schottky *** skillfully com.ining these distinct functional com.onents(m.-m.ene,m.S_(2),m.tal sulfides),we can engineer a m.ltiple heterogeneous interface with superior absorption capabilities,broad effective absorption bandwidths,and ultrathin m.tching *** successful establishm.nt of sem.conductor-sem.conductor-m.tal heterostructures gives rise to a built-in electric field that intensifies electron transfer,as confirm.d by density functional theory,which collaborates with m.ltiple dielectric polarization m.chanism. to substantially am.lify Em. *** detailed a successful synthesis of a series of m.-m.ene/m.-m.tal sulfides featuring both sem.conductor-sem.conductor and sem.conductor-m.tal *** achievem.nts were m.st pronounced in m.-m.ene/m.-Sn sulfide,which achieved rem.rkable reflection loss values of-70.6 dB at a m.tching thickness of only 1.885 *** cross-section calculations indicate that these m.ene/m.-m.tal sulfides have trem.ndous potential in practical m.litary stealth *** work m.rks a departure from.conventional com.onent design lim.tations and presents a novel pathway for the creation of advanced m.ene-based com.osites with potent Em. absorption capabilities.

关键词： Sem.conductor-sem.conductor-m.tal heterostructure Sem.conductor junctions m.tt-Schottky junctions Built-in electric field Electrom.gnetic wave absorption