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On the dynamics and collisions of settling spheroidal particles 认领 引用 被引量：1
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作者 Xinyu Jiang Lihao Zhao Luca Brandt 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期49-63,共15页
In this study,we perform particle-resolved simulations of settling spheroidal particles,considering oblate and prolate spheroids and spheres,and investigate the shape effect on the particle dynamics in suspensions wit... In this study,we perform particle-resolved simulations of settling spheroidal particles,considering oblate and prolate spheroids and spheres,and investigate the shape effect on the particle dynamics in suspensions with volume fraction 1%and 5%.We first examine the single-point statistics of the translational and rotational motion of the settling particles.The horizontal velocity has a symmetrical distribution with standard deviation dependent on the particle shape.The greater horizontal velocity fluctuations of the non-spherical particles,compared to that of spheres,are attributed to the horizontal drift of settling spheroids with oblique orientations induced by the fluid-particle and particle-particle interactions.The fluctuation of particle vertical velocity,instead,is skewed under the effect of wake-induced hydrodynamic interactions.Further,we explore the particle pair statistics,which demonstrate the formation of column-like particle micro-structures for the lowest volume fraction considered.This clustering is more pronounced for spheroidal particles than spheres,due to the stronger attractions among vertically-aligned settling spheroids.Moreover,the particle pair statistics are directly related to the collision rate among the dispersed particles.The local accumulation of oblate/prolate spheroids serves as the major mechanism to promote the particle-particle collisions in dilute suspensions. 展开更多
关键词 Particle sedimentation Dynamics Collision rate Immersed boundary method
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Effects of Pipe Vibration on Particle Dynamics During Hydraulic Transport in Deep-Sea Mining 认领 引用
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作者 LIU Lei LYU Hai-ning YUAN Bao-lei 《China Ocean Engineering》 SCIE EI CSCD 2026年第3期619-633,共15页
Deep-sea mining facilitates the extraction of valuable metal elements from the seabed for industrial development.However,the efficient transport of minerals to the sea surface presents significant challenges.This stud... Deep-sea mining facilitates the extraction of valuable metal elements from the seabed for industrial development.However,the efficient transport of minerals to the sea surface presents significant challenges.This study utilizes Computational Fluid Dynamics and Discrete Element Method(CFD-DEM)to examine particle dynamics within vibrating pipelines during hydraulic transport in deep-sea mining.The analysis focuses on particle behavior over one vibration cycle,incorporating sensitivity analyses of vibration frequency and amplitude effects.Results demonstrate that particles undergo periodic horizontal migration synchronized with pipe vibration frequency.Particle accumulation is observed near the vibration equilibrium position but diminishes at maximum positions.While mild to moderate pipe vibrations minimally affect particle dynamics,high amplitude and frequency combinations result in substantial particle accumulation near the pipe wall,leading to increased particle collisions and hydraulic gradient elevation up to 40%.For optimal safety and efficiency in hydraulic transport operations,pipe vibration amplitude should not exceed 0.4 times the pipe diameter,with frequency maintained below 0.6 Hz in deep-sea mining applications. 展开更多
关键词 deep-sea mining hydraulic transport particle dynamics pipe vibration CFD-DEM
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Particle dynamics and wear characteristics of lining layers in curved non-metallic flexible pipes for deep-sea mining 认领 引用 被引量：1
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作者 Ying-Ying Wang Yun-Di Liu +4 位作者 Ze-Qing Lin Hai-Bo Sun Zhuo Cheng Ke Wang Ding-Wen Huang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期447-463,共17页
Wear of the internal lining in the non-metallic flexible pipes(NMFPs)is a critical issue in long-distance hydraulic lifting for deep-sea mining,as it can lead to structural failure and reduced service life.The non-hom... Wear of the internal lining in the non-metallic flexible pipes(NMFPs)is a critical issue in long-distance hydraulic lifting for deep-sea mining,as it can lead to structural failure and reduced service life.The non-homogeneous,discontinuous flow of unevenly sized mineral particles,especially in the curved sections of the pipe,complicates the analysis of particle motion and wear characteristics.This research presents a numerical simulation model of particle dynamics in the internal layers of curved NMFPs,developed using the CFD-DEM coupling method,based on Hertz-Mindlin contact theory and the Archard wear model.The model captures the particle-particle and particle-wall collision behaviors,alongside energy dissipation patterns.A parametric analysis of the wear process was conducted to evaluate the service life of the bent NMFP.Results indicate that particle collision frequency and energy dissipation correlate with increased wear,while higher conveying speeds and larger particle diameters intensify wear.Under specified conditions of 6 m/s conveying speed and a maximum particle concentration of 0.15,an NMFP with a 10 mm internal layer thickness is estimated to last 3.65 years.These findings provide a technical reference for optimizing conveying parameters and minimizing internal wear in deep-sea hydraulic lifting systems at depths of 6000 m. 展开更多
关键词 Deep-sea mining Non-metallic flexible pipe CFD-DEM simulation Internal layer wear Hydraulic lifting system Particle dynamics
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Computational fluid dynamics-discrete element method investigation on spout deflection in spout-fluidized beds formed by cohesive non-spherical particles 认领 引用
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作者 Jiani Sun Guangchao Wei +1 位作者 Dan Zhou Xizhong An 《Particuology》 SCIE EI CAS CSCD 2026年第7期48-61,共14页
In this article,computational fluid dynamics-discrete element method(CFD-DEM)simulations were carried out to investigate the spout deflection dynamics in spout-fluidized beds formed by cohesive non-spherical particles... In this article,computational fluid dynamics-discrete element method(CFD-DEM)simulations were carried out to investigate the spout deflection dynamics in spout-fluidized beds formed by cohesive non-spherical particles.The work aims to clarify how particle cohesion and morphology jointly regulate bed stability and the associated flow structures.Rigorous validation of the prediction model precedes numerical simulations.The results reveal that increasing cohesive force systematically suppresses spout deflection,reduces high-velocity particle motions,and enhances bed-height fluctuations.Non-spherical particles further modulate these behaviours,and their influence varies with the cohesion level due to particle interlocking.Analysis of the normalized normal contact forces shows that most forces fall within F∗n≤4,and their probability first increases and then decreases with rising cohesion,with stronger effects at higher non-spherical contents.Time-averaged rotational energy decreases with increasing non-spherical particle content,while dominant frequencies remain primarily within 0 to 2 Hz.In addition,a concise predictive correlation is proposed to quantitatively describe the combined effects of cohesive force and non-spherical particle content on spout deflection intensity. 展开更多
关键词 Spout deflection Cohesive particle Non-spherical particle content CFD-DEM simulation Micro dynamics
Real-time visualization and numerical investigation of the dynamic compression response behaviours of single AP/HMX particles embedded in an HTPB binder 认领 引用
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作者 Yiming Zhang Hanqing Xia +4 位作者 Kangyu Ji Ningfei Wang Ke Li Sen Chen Yi Wu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期254-269,共16页
An in-depth understanding of the behaviours of solid propellants under low-velocity impact loads is crucial for enhancing their safety in applications such as aerospace propulsion.This study investigated the dynamic r... An in-depth understanding of the behaviours of solid propellants under low-velocity impact loads is crucial for enhancing their safety in applications such as aerospace propulsion.This study investigated the dynamic responses of single ammonium perchlorate(AP)/octogen(HMX)particles embedded in a hydroxyl-terminated polybutadiene(HTPB)binder under dynamic compression loading via real-time synchrotron-based X-ray phase contrast imaging and a modified split Hopkinson pressure bar(SHPB)system.The compression of the viscoelastic binder and subsequent dynamic fracturing of the AP/HMX particles were captured.During compression,transverse cracks developed within the AP particles,and their propagation led to particle fracturing,resulting in ductile fracturing.Unlike AP,HMX generated numerous short cracks within the internal and edge regions simultaneously,leading to fragmentation and brittle fracturing.Moreover,particle damage reduced the modulus of the sample,shifting its dynamic stress response from nonlinear elasticity to strain softening and further strain hardening as the binder exhibited plastic deformation.A compression simulation incorporating a real particle microscopic structure was established to study the mechanical response of the interface and particles.The simulation results agreed with the experimental observations.These results indicate that the shear stress at the HTPB-AP interface is greater than that at the HTPB-HMX interface,which is a factor influencing the differences in the mesoscale damage mechanisms of the particles. 展开更多
关键词 Synchrotron radiation source Dynamic compression Particle damage Microscopic simulation
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Dynamic Weighted Spherical Particle Swarm Optimization for UAV Path Planning in Complex Environments 认领 引用
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作者 Rui Yao Yuye Wang +2 位作者 Fei Yu Hongrun Wu Zhenya Diao 《Computers, Materials & Continua》 SCIE EI 2026年第5期1063-1081,共19页
Path planning for Unmanned Aerial Vehicles(UAVs)in complex environments presents several challenges.Traditional algorithms often struggle with the complexity of high-dimensional search spaces,leading to inefficiencies... Path planning for Unmanned Aerial Vehicles(UAVs)in complex environments presents several challenges.Traditional algorithms often struggle with the complexity of high-dimensional search spaces,leading to inefficiencies.Additionally,the non-linear nature of cost functions can cause algorithms to become trapped in local optima.Furthermore,there is often a lack of adequate consideration for real-world constraints,for example,due to the necessity for obstacle avoidance or because of the restrictions of flight safety.To address the aforementioned issues,this paper proposes a dynamic weighted spherical particle swarm optimization(DW-SPSO)algorithm.The algorithm adopts a dual Sigmoid-based adaptive weight adjustment mechanism for balancing global exploration and local exploitation,as well as a lens-based opposition learning one to improve search flexibility and solution diversity.Simulation experiments on real digital elevation models demonstrate that DW-SPSO significantly outperforms recent state-of-the-art particle swarm optimization(PSO)variants in terms of path safety,smoothness,and convergence speed.The performance superiority is statistically validated by the Wilcoxon signed-rank test.The results confirm the algorithm’s effectiveness in generating high-quality UAV paths under diverse threat conditions,offering a robust solution for autonomous navigation systems. 展开更多
关键词 Dynamic weight adjustment lens opposition learning particle swarm optimization path planning unmanned aerial vehicles
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Rheological behaviors of Na-montmorillonite considering particle interactions:A molecular dynamics study 认领 引用 被引量：1
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作者 Siqi Zhang Daoyuan Tan +2 位作者 Honghu Zhu Huafu Pei Bin Shi 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第7期4657-4671,共15页
Understanding the rheology of bentonite suspensions is crucial for ensuring the safety of engineering practices.However,the rheological mechanisms of bentonite remain unclear due to the limitations of conventional exp... Understanding the rheology of bentonite suspensions is crucial for ensuring the safety of engineering practices.However,the rheological mechanisms of bentonite remain unclear due to the limitations of conventional experimental techniques,particularly in assessing the microscopic interactions between clay particles and their impact on rheological properties.In this paper,the rheological behaviors of Namontmorillonite were studied with a focus on interparticle interactions.Both equilibrium molecular dynamics(MD)and non-equilibrium MD simulations were conducted to understand the physical properties of Na-montmorillonite under zero shear and various shear rates,respectively.The interaction between two parallel clay particles was determined in simulations,indicating that the classical Darjaguin-Landau-Verwey-Overbeek(DLVO)theory underestimates the interactions for a small separation distance.Na-montmorillonite exhibits a typical shear thinning behavior under shearing.However,as water content increases,it begins to behave more like liquid water.The yield stress of montmorillonite,as determined by the Bingham model,was found to be linearly related to the interaction pressures between clay particles.Besides MD simulations,the microstructure of clay suspension was further quantified using the separation distance and incline angle between non-parallel clay particles.Based on MD results and the quantified clay structure,a model was developed to estimate the yield stress of montmorillonite considering various influence factors,including electrolyte concentration,temperature,and solid fraction.Finally,from a comparison with calculated and experimental data,the results confirm the good performance of the proposed model.These findings provide significant insights for understanding the rheological soil behaviors and evaluating the yield stress of bentonite suspensions. 展开更多
关键词 Rheological behavior Yield stress Molecular dynamics Particle interactions Darjaguin-Landau-Verwey-Overbeek(DLVO)theory Microstructure Montmorillonite suspension
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Research Progress on Particle Behavior and Dynamics in Optical Tweezers 认领 引用
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作者 Jiali Pan 《Journal of Electronic Research and Application》 2025年第2期125-132,共8页
Optical tweezers technology utilizes the optical potential well generated by a focused laser beam to achieve precise manipulation of micro and nanoparticles.Based on the optical tweezers platform,the motion behavior a... Optical tweezers technology utilizes the optical potential well generated by a focused laser beam to achieve precise manipulation of micro and nanoparticles.Based on the optical tweezers platform,the motion behavior and dynamic laws of particles are deeply studied,which can reveal the transport mechanism of complex systems.Based on summarizing the principles and experimental methods of optical tweezers technology,this article systematically summarizes the typical force characteristics of particles in optical tweezers,focusing on the dynamic research progress of single particle non-equilibrium state,double particle coupling,and multi-particle cluster system,laying a theoretical foundation for expanding the application of optical tweezers technology in physics,chemistry,biology,and other fields. 展开更多
关键词 Optical tweezers Particle manipulation Brownian motion Non-equilibrium state Coupling dynamics
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Coupled computational fluiddynamics–discrete-element method investigation of soil contact erosion under cyclic hydraulic loading:A multiscale perspective 认领 引用
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作者 Xianfeng Diao Guoqing Cai +3 位作者 Tao Liu Peiyun Zhang Yanlin Su Bangzheng Rao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4812-4830,共19页
Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,mac... Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,macroscale experimental methods struggle to capture the microscopic deformations that occur during seepage-induced erosion.Therefore,this study,which is based on the coupled computational fluid dynamics–discrete element method(CFD–DEM)coupling method,investigates the contact mechanical mechanisms that induce macroscopic deformation under cyclic hydraulic gradients by considering the effects of different amplitudes and frequencies.The results show that the erosion mass of fine particles increases in a stepwise manner,with a multipeak variation in the erosion rate,and both the erosion amount and intensity are greater under constant gradient conditions.Fine particles erode primarily near the contact surface and,after migration,accumulate mainly in the coarse particle layers close to the contact surface.Increasing the amplitude and frequency of the cyclic hydraulic gradient leads to more fine particle blockages within the coarse particle layer.The cyclic hydraulic gradient causes the contact force chain network to repeatedly break and reorganize,reducing the shear strengths of the soil and resulting in more pronounced anisotropy in the contact force distribution. 展开更多
关键词 Computational fluid dynamics–discrete element method(CFD–DEM)coupling Contact erosion Cyclic hydraulic gradients Macroscopic deformation Micromechanism
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Experimental study on the dynamic response of HSTM under combined shock waves and sub-millimeter particle swarms loading 认领 引用
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作者 RuiJun Fan XiaoFeng Wang +3 位作者 ShaoHong Wang JinYing Wang He Huang AiGuo Pi 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第10期230-248,共19页
Low collateral damage weapons achieve controlled personnel injury through the coupling of shock waves and particle swarms,where the particle swarms arise from the high-explosive dispersion of compacted metal particle ... Low collateral damage weapons achieve controlled personnel injury through the coupling of shock waves and particle swarms,where the particle swarms arise from the high-explosive dispersion of compacted metal particle ring.To investigate the dynamic response of the human target under combined shock waves and particle swarms loading,a physical human surrogate torso model(HSTM)was developed,and the dynamic response test experiment was conducted under the combined loading.The effects of particle size on the loading parameters,the damage patterns of the ballistic plate and HSTM,and the dynamic response parameters of the HSTM with and without protection are mainly analyzed.Our findings revealed that particle swarms can effectively delay the shock wave attenuation,especially the best effect when the particle size was 0.28–0.45 mm.The ballistic plate mainly exhibited dense perforation of the outer fabric and impacted crater damage of ceramic plates,whereas the unprotected HSTM was mainly dominated by high-density and small-size ballistic cavity group damage.The peak values of the dynamic response parameters for the HSTM under combined loading were significantly larger than those under bare charge loading,with multiple peaks observed.Under unprotected conditions,the peak acceleration of skeletons and peak pressure of organs increased with the particle size.Under protected conditions,the particle size,the number of particles hit,and the fit of the ballistic plate to the HSTM together affected the dynamic response parameters of the HSTM. 展开更多
关键词 Low collateral damage Particle swarms Dynamic response Human surrogate torso model
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CFD Simulation of Passenger Car Aerodynamics and Body Parameter Optimization 认领 引用
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作者 Jichao Li Xuexin Zhu +2 位作者 Cong Zhang Shiwang Dang Guang Chen 《Fluid Dynamics & Materials Processing》 EI 2025年第9期2305-2329,共25页
The rapid advancement of technology and the increasing speed of vehicles have led to a substantial rise in energy consumption and growing concern over environmental pollution.Beyond the promotion of new energy vehicle... The rapid advancement of technology and the increasing speed of vehicles have led to a substantial rise in energy consumption and growing concern over environmental pollution.Beyond the promotion of new energy vehicles,reducing aerodynamic drag remains a critical strategy for improving energy efficiency and lowering emissions.This study investigates the influence of key geometric parameters on the aerodynamic drag of vehicles.A parametric vehicle model was developed,and computational fluid dynamics(CFD)simulations were conducted to analyse variations in the drag coefficient(Cd)and pressure distribution across different design configurations.The results reveal that the optimal aerodynamic performance—characterized by a minimized drag coefficient—is achieved with the following parameter settings:engine hood angle(α)of 15°,windshield angle(β)of 25°,rear window angle(γ)of 40°,rear upwards tail lift angle(θ)of 10°,ground clearance(d)of 100 mm,and side edge angle(s)of 5°.These findings offer valuable guidance for the aerodynamic optimization of vehicle body design and contribute to strategies aimed at energy conservation and emission reduction in the automotive sector. 展开更多
关键词 Automotive aerodynamic characteristics flow field aerodynamic drag drag reduction optimization CFD(computational fluid dynamics)
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Theoretical study on the bases-enhanced formic sulfuric anhydride nucleation:A new insight from the mechanism,dynamics,and atmospheric impact 认领 引用
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作者 Xiao-Ming Song Xin-Xin Li +4 位作者 Xin Zhou Shuang Ni Feng-Yang Bai Ke Zhang Zhen Zhao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期772-783,共12页
The formation of formic sulfuric anhydride(FSA)through gas-phase reactions between sulfur trioxide and formic acid represents a potentially important pathway in atmospheric aerosol nucleation processes.However,the nuc... The formation of formic sulfuric anhydride(FSA)through gas-phase reactions between sulfur trioxide and formic acid represents a potentially important pathway in atmospheric aerosol nucleation processes.However,the nucleation mechanisms and roles of FSA are not fully understood.The formation mechanism and kinetics of FSA with common atmospheric base precursors,including ammonia,methylamine,dimethylamine,urea clusters,and their hydration clusters were investigated in this study.Quantum chemistry calculations reveal that FSA clusters exhibit greater thermodynamic stability than sulfuric acid due to their increased hydrogen bonding sites and proton transfer capabilities,with water molecules further enhancing nucleation.Cluster dynamics simulations indicate that the nucleation effect of FSA surpasses that of sulfuric acid under similar concentrations,suggesting the significant role of FSA in regions with low sulfuric acid concentrations.Temperature,pressure,altitude,and humidity influence FSA and hydration cluster properties,with clusters favoring formation under low-temperature,highpressure conditions.This research provides new insights into the role of FSA in atmospheric aerosols,potentially enhancing understanding of nucleation processes. 展开更多
关键词 Formic sulfuric anhydride New particle formation Hydrate Thermodynamic stability Atmospheric dynamics
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Multiscale evolution of TiC particles in GH3536-based composites fabricated via laser powder bed fusion:coarsening mechanisms and hierarchical distribution 认领 引用
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作者 Peng Zhao Quanquan Han +7 位作者 Zhenhua Zhang Zhongyang Sui Liqiao Wang Bo Song Min Zhu Xiebin Wang Rossitza Setchi Chuanzhen Huang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期653-674,共22页
The laser powder bed fusion(LPBF)of metal matrix composites(MMCs)involves distinctive rapid melting and nonequilibrium solidification dynamics.Elucidating the intricate evolution mechanisms of particles is critical fo... The laser powder bed fusion(LPBF)of metal matrix composites(MMCs)involves distinctive rapid melting and nonequilibrium solidification dynamics.Elucidating the intricate evolution mechanisms of particles is critical for fabricating MMCs with superior strength-ductility synergy.In this study,both GH3536 Ni-based alloy and 5 wt%TiC-reinforced GH3536 composites(GH3536-5TiC)were fabricated via LPBF.The influence of volumetric laser energy density on the microstructure,mechanical properties,and multiscale evolution of TiC particles was systematically investigated.The experimental results revealed that a positive correlation existed between the energy density and both the TiC particle loss rate and average particle size,which was attributed to the coarsening and spattering behaviour of TiC particles,as demonstrated through multiscale evolution simulations.A dimensionless quantities framework based on kinetic calculations of the melt pool was established to determine the effect of energy density on TiC particle evolution.The growth mechanism of nanoscale TiC particles(<100 nm)is primarily governed by chemical transport,while microscale TiC particles(3-7μm)mainly undergo impingement-driven coarsening.Low energy density was found to reduce the impingement-driven coarsening.In addition,this study demonstrated the hierarchical distribution of TiC particles after multiscale evolution.Compared to GH3536,the GH3536-5TiC fabricated under low energy density conditions demonstrated significantly enhanced tensile performance.At 1173 K,its ultimate tensile strength and elongation values were found to be 304 MPa and 42%,respectively.Overall,this work provides a theoretical guideline for the performance optimisation of additively manufactured advanced composites via controlling the evolution of reinforcements. 展开更多
关键词 metal matrix composites additive manufacturing laser powder bed fusion particle evolution melt pool dynamics
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Parallelized Implementation of the Finite Particle Method for Explicit Dynamics in GPU 认领 引用 被引量：13
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作者 Jingzhe Tang Yanfeng Zheng +2 位作者 Chao Yang Wei Wang Yaozhi Luo 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第1期5-31,共27页
As a novel kind of particle method for explicit dynamics,the finite particle method(FPM)does not require the formation or solution of global matrices,and the evaluations of the element equivalent forces and particle d... As a novel kind of particle method for explicit dynamics,the finite particle method(FPM)does not require the formation or solution of global matrices,and the evaluations of the element equivalent forces and particle displacements are decoupled in nature,thus making this method suitable for parallelization.The FPM also requires an acceleration strategy to overcome the heavy computational burden of its explicit framework for time-dependent dynamic analysis.To this end,a GPU-accelerated parallel strategy for the FPM is proposed in this paper.By taking advantage of the independence of each step of the FPM workflow,a generic parallelized computational framework for multiple types of analysis is established.Using the Compute Unified Device Architecture(CUDA),the GPU implementations of the main tasks of the FPM,such as evaluating and assembling the element equivalent forces and solving the kinematic equations for particles,are elaborated through careful thread management and memory optimization.Performance tests show that speedup ratios of 8,25 and 48 are achieved for beams,hexahedral solids and triangular shells,respectively.For examples consisting of explicit dynamic analyses of shells and solids,comparisons with Abaqus using 1 to 8 CPU cores validate the accuracy of the results and demonstrate a maximum speed improvement of a factor of 11.2. 展开更多
关键词 Finite particle method GPU parallel computing explicit dynamics
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Single-Particle Tracking of Genetically Encoded Multimeric Nanoparticles Reveals Regional Heterogeneity and Osmotic Stress-Induced Convergence of Cytoplasmic Crowding in Plant Root Cells 认领 引用
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作者 Jiao Liang Mingli Zhang +9 位作者 Lan Yang Shiyu Song Boyao Fan Yi Jiang Jiahe Zhang Chang Liu Ting Wang Haiyun Ren Yi Zhang Hui Li 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期160-165,I0147-I0159,共6页
Macromolecular crowding is a fundamental physical property of the cytoplasm that governs intracellular diffusion and biochemical reactions.However,in situ quantitative characterization of intracellular dynamics and as... Macromolecular crowding is a fundamental physical property of the cytoplasm that governs intracellular diffusion and biochemical reactions.However,in situ quantitative characterization of intracellular dynamics and associated biophysical states in intact plant tissues remains challenging.Using 40-nm genetically encoded multimeric nanoparticles(GEMs)and single-particle tracking in Arabidopsis roots,we quantitatively map the regional heterogeneity of cytoplasmic diffusion dynamics and crowding along the root developmental axis:elongation zone cells exhibit a dense,low-mobility baseline,whereas maturation zone and root hair cells display higher mobility.These regions exhibit different sensitivities to osmotic stress.Notably,under severe ionic stress,both the diffusion coefficients and non-Gaussian parameters of the maturation zone and root hair cells converge toward the levels of the elongation zone cells,suggesting an intrinsic physical baseline for cytoplasmic crowding.This kinetic convergence in these cells is accompanied by vacuolar retraction and an increase in cytoplasmic thickness.Together,our study establishes a GEMs-based platform for in situ biophysical analysis in plant cells and uncovers a spatially-resolved physical landscape of cytoplasmic crowding and its dynamic reorganization under osmotic stress. 展开更多
关键词 macromolecular crowding plant tissues single particle tracking cytoplasmic diffusion intracellular diffusion arabidopsis rootswe biochemical reactionshoweverin situ quantitative characterization intracellular dynamics multimeric nanoparticles gems
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Statics,Dynamics and Linear Viscoelasticity from Dissipative Particle Dynamics Simulation of Entangled Linear Polymer Melts 认领 引用 被引量：2
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作者 Fan Wang Lu-Kun Feng +1 位作者 Ye-Di Li Hong-Xia Guo 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第9期1392-1409,I0007,共18页
Dissipative particle dynamics(DPD)with bond uncrossability shows a great potential in studying entangled polymers,however relatively little is known of applicability range of entangled DPD model to be use as a model f... Dissipative particle dynamics(DPD)with bond uncrossability shows a great potential in studying entangled polymers,however relatively little is known of applicability range of entangled DPD model to be use as a model for ideal chains and properly describe the full dynamics of entangled melts.Therefore,we perform a comprehensive study on structure,dynamics and linear viscoelasticity of a typical DPD entangled model system,semiflexible linear polymer melt.These polymers obey Flory's ideality hypothesis in chain dimensions,but their local structure exhibits nonideal behavior due to weak correlated hole effect.Both monomer motion and viscoelasticity relaxation reproduce the full pictures as predicted by reptation theory.The stronger chain length dependent diffusion coefficient and relaxation time as well as dynamic moduli are in close agreement with predictions of modern tube model that accounts for additional relaxation mechanisms besides chain reptation.However,an anomalous sub-diffusive center of mass motion is observed both before and after the intermediate reptation regime and the cross-correlation between chains is not negligible even these polymers obey stress-optical law,indicating limitations of the reptation theory.Hence semiflexible linear entangled DPD model can correctly describe statics and dynamics of entangled polymer melts. 展开更多
关键词 Entangled polymer melts Dynamics Linear viscoelasticity Dissipative particle dynamics
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Dissipative Particle Dynamics Simulations of Domain Growth and Phase Separation in Binary Immiscible Fluids 认领 引用 被引量：3
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作者 Ying Zhao Hong Liu +1 位作者 Zhong-yuan Lu Chia-chung Sun 《Chinese Journal of Chemical Physics》 SCIE EI CAS 北大核心 2008年第5期451-456,共6页
It was investigated that the domain growth processes of spinodal decomposition with different quenching depth in two and three dimensional binary immiscible fluids by using parallel dissipative particle dynamics simul... It was investigated that the domain growth processes of spinodal decomposition with different quenching depth in two and three dimensional binary immiscible fluids by using parallel dissipative particle dynamics simulations. In two dimensions, the dynamic scaling exponent 1/2 for coalescence and 2/3 for inertial regimes in the shallow quench and strong finite size effects in the cases of deep quenching were obtained. In three dimensions, it was used that the diffusive regime with exponent n=l/3 in the shallow quench and the inertial hydrodynamic regime with n=2/3 for different quenches. The viscous effects are not clearly reflected, showing n=1/2 in both shallow and deep quenches in this time period, due to the soft nature of interaction potential adopted in dissipative particle dynamics. 展开更多
关键词 Dissipative particle dynamics Binary immiscible fluids Domain growth
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Reliability Topology Optimization Based on Kriging-Assisted Level Set Function and Novel Dynamic Hybrid Particle Swarm Optimization Algorithm 认领 引用 被引量：1
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作者 Hang Zhou Xiaojun Ding +1 位作者 Song Chen Qijun Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第8期1907-1933,共27页
Structural Reliability-Based Topology Optimization(RBTO),as an efficient design methodology,serves as a crucial means to ensure the development ofmodern engineering structures towards high performance,long service lif... Structural Reliability-Based Topology Optimization(RBTO),as an efficient design methodology,serves as a crucial means to ensure the development ofmodern engineering structures towards high performance,long service life,and high reliability.However,in practical design processes,topology optimization must not only account for the static performance of structures but also consider the impacts of various responses and uncertainties under complex dynamic conditions,which traditional methods often struggle accommodate.Therefore,this study proposes an RBTO framework based on a Kriging-assisted level set function and a novel Dynamic Hybrid Particle Swarm Optimization(DHPSO)algorithm.By leveraging the Kriging model as a surrogate,the high cost associated with repeatedly running finite element analysis processes is reduced,addressing the issue of minimizing structural compliance.Meanwhile,the DHPSO algorithm enables a better balance between the population’s developmental and exploratory capabilities,significantly accelerating convergence speed and enhancing global convergence performance.Finally,the proposed method is validated through three different structural examples,demonstrating its superior performance.Observed that the computational that,compared to the traditional Solid Isotropic Material with Penalization(SIMP)method,the proposed approach reduces the upper bound of structural compliance by approximately 30%.Additionally,the optimized results exhibit clear material interfaces without grayscale elements,and the stress concentration factor is reduced by approximately 42%.Consequently,the computational results fromdifferent examples verify the effectiveness and superiority of this study across various fields,achieving the goal of providing more precise optimization results within a shorter timeframe. 展开更多
关键词 Reliability topology optimization kriging model level set function dynamic hybrid particle swarm optimization engineering structure
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Dissipative particle dynamics simulation of flow through periodic arrays of circular micropillar 认领 引用 被引量：3
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作者 Luwen ZHOU Yuqian ZHANG +1 位作者 Xiaolong DENG Moubin LIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2016年第11期1431-1440,共10页
Flow through arrays of micropillar embedded inside microfluidic chip systems is important for various microfluidic devices. It is critical to accurately predict the mass flow rate through pillar arrays based on the pi... Flow through arrays of micropillar embedded inside microfluidic chip systems is important for various microfluidic devices. It is critical to accurately predict the mass flow rate through pillar arrays based on the pillar design. This work presents a dissipative particle dynamics （DPD） model to simulate a problem of flow across periodic arrays of circular micropillar and investigates the permeability of two types of micropillar arrays. The flow fields including horizontal and vertical velocity fields, the number density field, and the streamline of the flow are analyzed. The predicted solid volumes by the presented DPD simulation of both types of arrays are quite close to the actual counterparts. These quantitative agreements show usefulness and effectiveness of the DPD model in simulating arrays of micropillar. By comparing two types of micropillar arrangement patterns, we find that the arrangement pattern of micropillar does not have significant influence on the permeability of the array. 展开更多
关键词 array of micropillar permeability dissipative particle dynamics （DPD）
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Charging Properties and Particle Dynamics of Chang’e-5 Lunar Sample in an External Electric Field 认领 引用 被引量：1
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作者 Junping Gu Xiaoyu Qian +14 位作者 Yiwei Liu Qinggong Wang Yiyang Zhang Xuan Ruan Xiangjin Deng Yaowen Lu Jian Song Hui Zhang Yunning Dong Mengmeng Wei Wei Yao Shuiqing Li Weihua Wang Zhigang Zou Mengfei Yang 《Engineering》 SCIE EI CAS CSCD 2024年第11期267-277,共11页
Facing the challenges of in-situ utilization of lunar regolith resources,applying an external electric field to manipulate lunar particles has become a promising method for space particle control,which mainly depends ... Facing the challenges of in-situ utilization of lunar regolith resources,applying an external electric field to manipulate lunar particles has become a promising method for space particle control,which mainly depends on the particle charging properties in the applied electric field.Using the surficial lunar regolith samples brought back from the Moon by the Chang’e-5 mission(CE5 LS),this work successively studied their charging properties,particle dynamics,and their collision damages to aerospace materials under the action of an external electric field in high-vacuum conditions.The results indicated that the charging pro-cess and electrostatic projection of lunar regolith particles under high-vacuum conditions were different from those under atmosphere conditions.The particle diameter range of CE5 LS used in the experiment is 27.7-139.0 lm.For electric field strength of 3-12 kV·cm-1,the charge obtained by CE5 LS is 4.8×10-15-4.7×10-13 C and the charge-to-mass ratio is 1.2×10-5-6.8×10-4 C·kg-1.The CE5 LS is easier to be negatively charged in an external electric field.Furthermore,significant damages were observed on the target impact surfaces,indicating severe influences of lunar regolith particles on aerospace materials.Our work contributes to a more comprehensive understanding of physical mechanisms controlling the lunar regolith shielding and utilization,and will inspire broad efforts to develop the lunar in-situ engi-neering solutions. 展开更多
关键词 Chang’e-5 lunar regolith sample Charging properties External electric field Particle dynamics Particle collision
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