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Numerical Study of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM

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Journal of Ocean University of Ch.na 2024年第4期23卷 897-914页

作者： WANG Ch.olin WU Guoxiang WANG Dianh. DU Sh.ngtao z.ANG z.iyong JIN h.ng zhu David z. LIANG Bingch.n Dongh.i Academy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key Laboratory of Estuary and Coast of z.ejiang Province and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China Sh.ndong Provincial Key Laboratory of Ocean Engineering and College of EngineeringOcean University of ChinaQingdao 266100China Sh.ndong Water Conservancy Vocational College Rizhao 276826China Sch.ol of Mech.nical and Energy Engineering Ningbotech UniversityNingbo 315211China

Elucidating th. flow features around piles in local scouring processes is crucial for studies of local scouring mech.nisms and scour depth.*** study details th. flow turbulence ch.racteristics of two submerged piles th.t are determined by solving th. Navier-Stokes equations with.th. improved delayed detach.d eddy simulation *** model is verified by comparing experimental and numerical results for h.drodynamic parameters with.th. literature for both.square-crossing piles(SCPs)and circular-crossing piles(CCPs).Original topograph.es of flat and scoured beds(i.e.,th. initial and equilibrium scouring stages)are based on experimental results obtained by th. auth.rs in th. present *** and CCP flow features in th. scouring process are *** results indicate th.t during th. scouring process,th. time-averaged drag coefficient and root mean square(rms)of th. lift coefficient increase linearly in th. CCP test,wh.le th. rms of th. lift coefficient in th. SCP test decreases ***,th. minimum pressure coefficient is always located in th. upstream corners in th. SCP case but moves from 72.5°to 79.5°wh.n th. scour h.le is completely developed in th. CCP *** flow beh.nd th. pile,wh.ch.is generated by separated boundary layers above th. top face of th. pile,can reach.th. sand bed and turn th. separated sh.ar layers into patch.s of small vortices in th. near-wake ***,th. h.gh.sh.ar stress z.nes are mainly at th. scour edges under scoured-bed conditions.

关键词： flat bed scoured bed local scour OpenFOAM bed sh.ar stress

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Membrane-coated nanoparticles as a biomimetic targeted delivery system for tumour th.rapy

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Biomaterials Translational 2024年第1期5卷 33-45页

作者： Guo h. Guo M. Xia z. Sh.o z. Department of Orth.paedic Beijing Jishuitan Hospital Capital Medical University Beijing China Department of Orth.paedic Beijing Jishuitan Hospital Fourth Medical College of Peking University Beijing China National Center for Orth.paedics Beijing China Department of Orth.paedics Affiliated Hospital of NCO School of Army Medical University Hebei Province Shijiazhuang China Centre for Nanoh.alth ILS2 Medical School Swansea University Swansea United Kingdom Department of Orth.paedics Union Hospital Tongji Medical College Huazhong University of Science and Technology Hubei Province Wuhan China

Drug th.rapy towards tumours often causes adverse effects because of th.ir non-specific nature. Membrane-coated tech.ology and membrane-coated nanoparticles provide an advanced and promising platform of targeted and safe delivery. By camouflaging th. nanoparticles with.natural derived or artificially modified cell membranes, th. nano-payloads are bestowed with.properties from cell membranes such.as longer circulation, tumour or inflammation-targeting, immune stimulation, augmenting th. performance of traditional th.rapeutics. In th.s review, we review th. development of membrane coating tech.ology, and summarise th. tech.ical details, ph.sicoch.mical properties, and research.status of membrane-coated nanoparticles from different sources in tumour treatment. Finally, we also look forward to th. prospects and ch.llenges of transforming membrane coating tech.ology from experiment into clinical use. Taken togeth.r, membrane-coated nanoparticles are bound to become one of th. most potential anti-tumour strategies in th. future. © 2024, Ch.nese Medical Multimedia Press Co Ltd. All righ.s reserved.

关键词： biomimetic targeted delivery system membrane-coated nanoparticles membrane-coated tech.ology tumour th.rapy

Preliminary Application of h.gh.Frequency Ultrasound in th. Differentiation of Pemph.gus and Bullous Pemph.goid: An Observational Study

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International Journal of Dermatology and Venereology 2024年第3期7卷 155-159页

作者： Liu Y.-A. Cao R. Da M.-h. Dong z.-B. Wang F. Department of Dermatology Taizhou Central Hospital (Taizhou University Hospital) Zhejiang Taizhou 318000 China Department of Dermatology Children's Hospital of Soochow University Jiangsu Suzhou 215025 China Department of Dermatology Zhongda Hospital Southeast University Jiangsu Nanjing 210009 China

Objective: Ultrasonograph. is a diagnostic imaging tech.ique used to visualiz. subcutaneous body structures for identification of possible path.logies. In th.s study, we aimed to explore th. clinical significance of h.gh.frequency ultrasound in differentiating th. location of blisters between pemph.gus and bullous pemph.goid. Meth.ds: Eigh.een patients were recruited in Department of Dermatology, z.ongda h.spital from 2020 to 2021 and divided into a pemph.gus group (n = 8) and a bullous pemph.goid group (n = 10) according to th. diagnostic criteria for each. Ultrasonograph.c images were collected using a 50-Mh.0}h.gh.frequency ultrasound system. Th. indexes of ultrasonic evaluation were th. layer (epidermis or dermis), siz., sh.pe, internal ech., and boundary of th. blister. Categorical variables are expressed as n (%), and differences were compared using Fish.r's exact test. Results: Th. ultrasonograph.c images in th. pemph.gus group sh.wed an intraepidermal semi-arc or irregular anech.ic or h.poech.ic areas. Th. inferior borders were situated above th. ch.racteristic th.n linear h.perech.ic bands of th. epidermis. A linear h.poech.ic band was present at th. dermoepidermal junction in some cases. In th. ultrasonograph.c images of th. bullous pemph.goid group, th. linear h.perech.ic bands of th. epidermis were continuous and intact. An oval fluid anech.ic area (subepidermal blister) was present immediately below th. bands. Th. location of th. blisters in th. ultrasonograph.c images was significantly different between th. 2 groups (P h.gh.frequency ultrasound can be used as an auxiliary means to differentiate th. location of blisters between pemph.gus and bullous pemph.goid. © 2022 h.spital for Skin Diseases (Institute of Dermatology), Ch.nese Academy of Medical Sciences, and Ch.nese Medical Association, publish.d by Wolters Kluwer, Inc.

关键词： bullous pemph.goid h.gh.frequency ultrasound pemph.gus

Decellularised extracellular matrix-based injectable h.drogels for tissue engineering applications

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Biomaterials Translational 2024年第2期5卷 114-128页

作者： Guo W.-Y. Wang W.-h. Xu P.-Y. Kankala R.K. Ch.n A.-z. Institute of Biomaterials and Tissue Engineering Huaqiao University Fujian Province Xiamen China Fujian Provincial Key Laboratory of Bioch.mical Tech.ology (h.aqiao University) Fujian Province Xiamen China

Decellularised extracellular matrix (dECM) is a biomaterial derived from natural tissues th.t h.s attracted considerable attention from tissue engineering research.rs due to its exceptional biocompatibility and malleability attributes. Th.se advantageous properties often facilitate natural cell infiltration and tissue reconstruction for regenerative medicine. Due to th.ir excellent fluidity, th. injectable h.drogels can be administered in a liquid state and subsequently formed into a gel state in vivo, stabilising th. target area and serving in a variety of ways, such.as support, repair, and drug release functions. Th.s, dECM-based injectable h.drogels h.ve broad prospects for application in complex organ structures and various tissue injury models. Th.s review focuses on exploring research.advances in dECM-based injectable h.drogels, primarily focusing on th. applications and prospects of dECM h.drogels in tissue engineering. Initially, th. recent developments of th. dECM-based injectable h.drogels are explained, summarising th. different preparation meth.ds with.th. evaluation of injectable h.drogel properties. Furth.rmore, some specific examples of th. applicability of dECM-based injectable h.drogels are presented. Finally, we summarise th. article with.interesting prospects and ch.llenges of dECM-based injectable h.drogels, providing insigh.s into th. development of th.se composites in tissue engineering and regenerative medicine. © 2024, Ch.nese Medical Multimedia Press Co Ltd. All righ.s reserved.

关键词： decellularisation meth.ds decellularised extracellular matrix injectable h.drogels tissue engineering

Fast efficient ph.ton deceleration in plasmas by using two laser pulses at different frequencies

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Matter and Radiation at Extremes 2024年第3期9卷 11-18页

作者： Y.X.Wang X.L.zhu S.M.Weng P.Li X.F.Li h.Ai h.R.Pan z.M.Sh.ng Key Laboratory for Laser Plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Research.Center of Laser Fusion of Ch.na Academy of Engineering Ph.sics MianyangSichuan 621900China State key Laboratory of h.gh.Field Laser Ph.sics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

Th. generation of ultrash.rt h.gh.power ligh. sources in th. mid-infrared(mid-IR)to terah.rtz.Th.0}range is of interest for applications in a number of fields,from fundamental research.to biology and *** conventional laser tech.ology,ph.ton deceleration in plasma wakes provides an alternative approach.to th. generation of ultrash.rt mid-IR or Th.0}***,we present a ph.ton deceleration sch.me for th. efficient generation of ultrash.rt mid-IR or Th.0}pulses by using an intense driver laser pulse with.a relatively sh.rt wavelength.and a signal laser pulse with.a relatively long *** signal pulse trails th. driver pulse with.an appropriate time delay such.th.t it sits at th. front of th. second wake bubble th.t is driven by th. driver *** to its relatively long wavelength.th. signal pulse will be subjected to a large gradient of th. refractive index in th. plasma wake ***,th. ph.ton deceleration in th. plasma wake becomes faster and more efficient for signal pulses with.longer *** greatly enh.nces th. capacity and efficiency of ph.ton deceleration in th. generation of ultrash.rt h.gh.power ligh. sources in th. long-wavelength.IR and Th.0}spectral ranges.

关键词： laser ultrash.rt ph.ton

Rational design of AgGaS/z.S/z.S quantum dots with.a near-unity ph.toluminescence quantum yield via double sh.lling sch.me

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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.z.ang 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 z.ongsh.n-Fudan Joint Innovation Center Zhongshan 528437China

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

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

Precipitation of multi-type nano-quasicrystals in a Mg-z.-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.z.ou L.F.z.ang 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-6z.-1Y(at.%)ribbons with.strength.ning precipitates of multi-type nanoquasicrystals 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 quasicrystals were formed in aged ribbons,in addition to precipitation of nanometer icosah.dral ***-resolution observations reveal th.t both.decagonal quasicrystals can be modeled by quasiperiodic tiling with.decagonal clusters of 2.5 nm in diameter,but overlap of neigh.oring clusters in both.decagonal quasicrystals is different from th. Gummelt model observed in oth.r quasicrystals.A sh.ll composed of complex Laves Mg-z. domains was formed surrounding each.decagonal quasicrystal precipitate upon prolonged *** addition,all kinds of nanoprecipitates exh.bit excellent structure and siz. stability at 573 *** findings may h.ve implications for not only fundamental studies about quasicrystals,but also microstructural manipulation of h.gh.performance Mg alloys.

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

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Predefined-time repetitive learning control of robotic manipulators

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Kongz.i yu Juece/Control and Decision 2024年第11期39卷 3719-3726页

作者： Li Y.-Q. Ch.n Q. Sh. h.-h. z.ang z.-h. Ch.n P. College of Information Engineering Zhejiang University of Technology Hangzhou 310023 China

A backstepping-based predefined-time repetitive learning control sch.me is proposed for uncertain robot manipulators to ach.eve rapid and h.gh.precision tracking control performance. A non-singular predefined-time virtual controller is constructed to effectively avoid th. singularity issues caused by th. differentiation of th. virtual controller in conventional finite-time backstepping design. It ensures th.t th. tracking error of th. robot manipulators joint positions converges to a neigh.orh.od of th. origin with.n th. predefined time. Th.n, th. lumped uncertainty of th. manipulator is separated into periodic and non-periodic parts by considering th. periodic ch.racteristics of th. desired trajectory. A fully saturated repetitive learning law is constructed to accurately estimate and compensate for th. periodic uncertainty. Meanwh.le, a robust control law is developed and th. terminal attracting tech.ique is applied to guarantee th. effective compensation of th. non-periodic uncertainty including external disturbances, such.th.t th. h.gh.precision tracking of th. robot manipulators joint positions is ach.eved. Finally, th. stability of th. closed-loop system and th. error convergence performance of th. proposed sch.me are analyz.d th.ough.th. Lyapunov stability synth.sis. Th. effectiveness of th. proposed control meth.d is verified by comparative simulations. © 2024 North.ast University. All righ.s reserved.

关键词： backstepping recursive algorith. periodic uncertainty predefined-time control repetitive learning law robot manipulator tracking control

An introductory review of swarm tech.ology for spacecraft on-orbit servicing

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International Journal of Mech.nical System Dynamics 2024年第1期4卷 3-21页

作者： El Gh.li Asri z.eng h.zhu Department of Mech.nical Engineering York UniversityTorontoOntarioCanada

Th.s review paper presents a compreh.nsive evaluation and forward-looking perspective on th. underexplored topic of servicing target objects using spacecraft *** targets can be known or unknown,cooperative or uncooperative,and pose significant ch.llenges in modern space operations due to th.ir inh.rent complexity and *** servicing space objects is vital for active debris removal and broader on-orbit servicing tasks such.as satellite maintenance,repair,refueling,orbital assembly,and *** effort h.s been invested in th. literature to explore th. servicing of targets using a single *** its advantages and benefits,th.s paper expands th. discussion to encompass a swarm approach.to th. *** review covers various single-spacecraft approach.s and presents a critical examination of th. existing,alth.ugh.limited,body of work dedicated to servicing orbital objects using multiple *** focus is also broadened to include some influential studies concerning th. ch.racteriz.tion,capture,and manipulation of ph.sical objects by general multiagent systems,a subject with.significant parallels to th. core interest of th.s ***,th.s article also delves into th. realm of simultaneous localiz.tion and mapping,h.gh.igh.ing its application with.n close-proximity operations in space,especially wh.n dealing with.unknown uncooperative *** attention is paid to th. benefits th.t th.s field can receive from distributed multiagent ***,an exploration of th. promising field of swarm robotics is presented,with.an emph.sis on its potential to revolutioniz. th. servicing of orbital target ***,a survey of general research.directly engaging swarms in th. orbital context is *** review aims to bridge th. knowledge gap and stimulate furth.r research.in th. underexplored domain of servicing space targets with.spacecraft swarms.

关键词： space robotics on-orbit servicing close-proximity operations guidance and navigation swarm robotics multiagent systems object capture and manipulation simultaneous localiz.tion and mapping