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Non-monotonic temperature evolution of nonlocal structure–dynamics correlation in CuZr glass-forming liquids 认领 引用 被引量：1
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作者 W J Jiang M Z Li 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期370-375,共6页
The structure–dynamics correlations in a nonlocal manner were investigated in CuZr metallic glass-forming liquids via classical molecular dynamics simulations.A spatial coarse-graining approach was employed to incorp... The structure–dynamics correlations in a nonlocal manner were investigated in CuZr metallic glass-forming liquids via classical molecular dynamics simulations.A spatial coarse-graining approach was employed to incorporate the nonlocal structural information of given structural order parameters in the structure–dynamics relationship.It is found that the correlation between structure order parameters and dynamics increases with increasing coarse-graining length and has a characteristic length scale.Moreover,the characteristic correlation length exhibits a non-monotonic temperature evolution as temperature approaches glass transition temperature,which is not sensitive to the considered structure order parameters.Our results unveil a striking change in the structure–dynamics correlation,which involves no fitting theoretical interpretation.These findings provide new insight into the structure–dynamics correlation in glass transition. 展开更多
关键词 metallic glass-forming liquid structure–dynamics correlation molecular dynamics simulation
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Influence mechanism of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation of igneous metamorphic coal 认领 引用
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作者 Xu Shao Botao Qin +5 位作者 Quanlin Shi Ziwei Li Bao Qu Shibo Xu Junyu Wang Mingyue Weng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期553-572,共20页
In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study invest... In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study investigates the specific surface area,pore volume,structure complexity/connectivity,heterogeneity/local features of pore size distribution,and oxygen consumption dynamics of igneous metamorphic coal through N2/CO2 isothermal adsorption tests and low-temperature oxidation experiments,and elucidates the influence mechanisms of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation.With increasing metamorphic degree,igneous metamorphic coal exhibits a more pronounced reduction in specific surface area during oxidation,while the increase in structure complexity due to coal-oxygen reactions is suppressed.Thermally metamorphic coal demonstrates accelerated oxygen consumption,with oxidation amplifying the difference in reaction rates compared to raw coal.Key mechanisms include oxidation-induced reduction in mesopore complexity and micropore volume,decreased dominance of small-pore-volume apertures,and increased heterogeneity,collectively leading to a lower half-oxygen-consuming temperature and steeper oxygen consumption curves.Simultaneously,increased pore volume/complexity and reduced uniformity/connectivity act synergistically to enhance oxygen consumption capacity,highlighting the coupling between pore structure evolution and oxidation behavior in igneous metamorphic coal.This study provides theoretical insights into the pore-oxygen coupling mechanisms governing coal spontaneous combustion in igneous intrusion areas. 展开更多
关键词 Igneous metamorphic coal Thermal metamorphism Low-temperature oxidation Pore structure Oxygen consumption dynamics
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Influence of CaO-SiO2-Al2O3-MgO slag structure on dissolution behavior of Al2O3:a molecular dynamics simulation 认领 引用
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作者 Yi-Hong Li Ming-Ming Lu +4 位作者 Rui Wang Dong Wang Xin Hu Peng Zhang Qiang Zhu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期110-124,共15页
The structural changes in the CaO-SiO2-Al2O3-MgO slag system with varying CaO contents were investigated through molecular dynamics(MD)simulations,and its effect on the dissolution behavior of alumina inclusi... The structural changes in the CaO-SiO2-Al2O3-MgO slag system with varying CaO contents were investigated through molecular dynamics(MD)simulations,and its effect on the dissolution behavior of alumina inclusions was characterized by the Kullback-Leibler(KL)divergence.The slag structure analysis revealed that the[AlO]tetrahedral structure was the primary network structure in the slag.With increasing the CaO content,the non-bridge oxygen(NBO)content in the slag structure increases,and the bridge oxygen(BO)content decreases,thereby reducing the complexity of the slag network structure.Raman spectroscopy detection verifies the results of the MD simulations.The results indicated that the dissolution rate of alumina inclusions accelerates with increasing the CaO content in the slag,owing to the reduced complexity of the slag network structure and the enhanced interatomic interactions.The simulation results for the dissolution of alumina inclusions were consistent with theoretical calculations based on the slag inclusion capacity and the dimensionless dissolution rate of inclusions.Radial distribution function analysis demonstrated that the interaction between atoms in the slag system and alumina inclusions strengthens,increasing the dissolution rate of alumina inclusions.The[AlO6]octahedral structure of the alumina inclusions is disrupted,forming BO structures,which in turn enhances the complexity of the slag network structure,slowing the dissolution rate of alumina inclusions.In contrast,the slag system with a higher CaO content has a relatively simpler network structure,promoting faster alumina inclusion dissolution. 展开更多
关键词 Molecular dynamics simulation Slag structure Dissolution behaviour Alumina inclusion Dissolution rate
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Nuclear magnetic resonance-guided Monte Carlo/molecular dynamics structure inference for amorphous solids 认领 引用
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作者 Kangren Kong Zaiqiang Ma +2 位作者 Yu Yin Zhaoming Liu Ruikang Tang 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2026年第3期10-16,共7页
Amorphous solids,which do not possess a long-range order,hold great promise in mechanical,optical,chemical,and other properties,and have also been revealed as critical biomineralization precursors.However,funda-mental... Amorphous solids,which do not possess a long-range order,hold great promise in mechanical,optical,chemical,and other properties,and have also been revealed as critical biomineralization precursors.However,funda-mental questions about their three-dimensional(3D)atomic structure remain challenging due to the long-range disorder.Conventional protocols probe such molecular structures through scattering or real-space imaging.The former provides ensemble-averaged data that masks local structural deviations,while the latter is hampered by the electron-beam sensitivity of materials.Nevertheless,based on distance-sensitive heteronuclear coupling,rotational echo double resonance(REDOR),a specialized solid-state nuclear magnetic resonance(NMR)mea-surement,is efficient in detecting local deviations and usually nondestructive.Here,using amorphous calcium carbonate/phosphate Ca(CO3)x(PO4)2(1-x/3)(0<x<1,CaCPs)solids synthesized by ion cross-linking as an example,we develop a nondestructive method to reveal local deviations of amorphous ionic solids by combining REDOR,Monte Carlo(MC),and molecular dynamic(MD)simulation.Briefly,MC simulations generated atomic structures with heterogeneous medium-range spatial apportionment of ions,and MD simulations relaxed the initial configuration to rationalize short-range order.Then,theoretical REDOR decay curves of MC/MD-generated structures were compared with experimental values to check the medium-range order.We revealed that there is heterogeneous medium-range spatial apportionment of anions in CaCPs.Since solid-state NMR is applicable to nearly all spin-active materials,this methodology offers a versatile alternative for resolving the atomic structure of amorphous solids. 展开更多
关键词 REDOR Amorphous material Molecular dynamics Calcium carbonate Calcium phosphate
Insight into properties and structures of ionic liquids by machine learning molecular dynamics simulation 认领 引用
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作者 Yaxi Yu Zhenlei Wang +1 位作者 Xiaochun Zhang Kun Dong 《Green Energy & Environment》 SCIE EI CAS CSCD 2026年第2期500-510,共11页
Ionic liquids(ILs)have exhibited great application potential in many fields due to their unique properties.Molecular dynamics(MD)simulation has been widely employed to investigate their microscopic structure.However,c... Ionic liquids(ILs)have exhibited great application potential in many fields due to their unique properties.Molecular dynamics(MD)simulation has been widely employed to investigate their microscopic structure.However,classical molecular dynamics simulations struggle to accurately describe the complex interactions in ILs using the existing parameterized force fields.Recently,the MD simulations based on machine learning force fields(MLFFs)trained by first-principles calculations have attracted considerable attentions due to their abilities to balance computational accuracy and efficiency.Herein,we report the Bayesian-based MLFFs which can be successfully applied in IL systems and accelerate MD simulation.The calculated atomic forces,structures,and vibrational behaviors were validated to match the accuracy of firstprinciples calculations.Properties of the imidazolium-based ILs,including density,self-diffusion coefficients,viscosity,and radial distribution functions were predicted at the extended scales.Z-bonds that describe the unique structures in ILs were analyzed and the influences of Cpositions,temperature,and solvent H2O on Z-bonding configurations were systematically investigated.Our results confirmed that MLFFs presented the strong feasibility to investigate the large and complex systems,especially to predict structures and properties of the ILs.And the procedure described for MLFFs provides valuable guidance for researchers who are studying ILs. 展开更多
关键词 Ionic liquids Machine learning force field Molecular dynamics
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Molecular Dynamics Simulation on Compatibility and Microstructure Evolution During Stress-lnduced Phase Transformation in NiTi Single Crystal 认领 引用
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作者 Yi-Fan Li Wen-Ping Wu +1 位作者 Yong-Jun He Hao Yin 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第3期329-360,共32页
Understanding phase transformation behaviors is essential for the material design of shape memory alloys(SMAs).This paper studies stress-induced phase transformation in single-crystal NiTi SMAs with three orientations... Understanding phase transformation behaviors is essential for the material design of shape memory alloys(SMAs).This paper studies stress-induced phase transformation in single-crystal NiTi SMAs with three orientations(i.e.,[001],[101],and[111])using molecular dynamics(MD)simulations.Microstructural evolutions and mechanical responses are analyzed.Results indicate that different orientations promote transformation into martensitic variants with greater atomic-scale transformation strain,resulting in larger phase transformation strains in the stress-strain responses.Subsequently,microstructure compatibility is studied.Patterns after transformation are classified into three types:parallel twins,twin-twin domains,and multiple-twin domains.The specific patterns formed depend on both loading mode and crystal orientation.Further analyses indicate that:(1)all the interfaces obtained in this study satisfy their corresponding twinning equations;(2)the global compatibility analysis shows the[101]compression model's cross twinning matches one ideal case,while the[111]tension model's triple junction corresponds to four possible cases.This work provides novel insights into microstructure compatibility in differently oriented NiTi single crystal,enhancing understanding of their phase transformation processes. 展开更多
关键词 Molecular dynamics simulation Single-crystal NiTi Shape memory alloys Orientation Phase transformation Compatibility
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Unveiling the role of residual structure in hydrate secondary formation through molecular dynamics simulations 认领 引用
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作者 Yi-Fan Zhang Sen-Bo Xiao +1 位作者 Zhi-Liang Zhang Jian-Ying He 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期514-523,共10页
The rapid secondary formation of gas hydrate is a potential cause of flowline blockage in deepwater oil and gas production systems,posing serious flow assurance challenges.However,its microscopic formation mechanism r... The rapid secondary formation of gas hydrate is a potential cause of flowline blockage in deepwater oil and gas production systems,posing serious flow assurance challenges.However,its microscopic formation mechanism remains an area of active research.Recently,the residual structure hypothesis has gained significant attention in explaining the rapid secondary formation of hydrates.In this study,massive molecular dynamics simulations are conducted to investigate the secondary formation of methane hydrates in solutions containing hydrate residual structures of varying sizes.The results indicated that residual structures,owing to their hydrate-like characteristics,facilitate the adsorption and capture of methane molecules,leading to the formation of local gas supersaturation regions.Residual structures promote hydrate formation through two key mechanisms:acting as nucleation sites and supplementing methane concentrations.Particularly,a synergy between residual structures and gas concentration was identified:high gas concentrations stabilize small residual structures,allowing them to serve as nucleation sites,while large stable structures can enrich methane even under low gas concentration.This work not only provided a detailed understanding of the mechanisms of hydrate secondary formation but also provided valuable insight for hydrate blockage prediction and control in subsea oil and gas pipelines,contributing to improved flow assurance strategies. 展开更多
关键词 Natural gas hydrate Secondary formation Residual structure Gas supersaturation Flow assurance Molecular dynamics
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Molecular dynamics investigation on structure and crystallization characteristics of MgO-CaO-Al2O3-SiO2 oxides 认领 引用
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作者 Zheng-Tao Li Wen Yang +4 位作者 Li-Feng Zhang Wu-San Liang Guo-Li Du Yong-Wu Li Yao Zeng 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期469-481,共13页
MgO has been shown to facilitate the precipitation of MgO-rich crystalline phases within the MgO-CaO-Al2O3-SiO2(MCAS)glassy inclusion system,which possesses a high liquidus temperature and a significant Young... MgO has been shown to facilitate the precipitation of MgO-rich crystalline phases within the MgO-CaO-Al2O3-SiO2(MCAS)glassy inclusion system,which possesses a high liquidus temperature and a significant Young’s modulus.The underlying linkage between the structural evolution and the crystallization characteristics of the MCAS system was systematically investigated using molecular dynamics simulation and thermodynamic calculation.The results revealed that Mg2+ ions played a dual role,constructing networks through the formation of tricluster oxygens while consuming bridging oxygens(BOs)in a mechanism similar to Ca2+ ions.However,despite this dual role,the network connectivity was still decreased with the increase in MgO/(MgO+Al2O3)(M/(M+A))and CaO/(CaO+SiO2)(C/(C+S))ratios,primarily due to the reduction in BOs.This microscopic structural evolution resulted in a reduction in viscosity and an enhancement of crystallization ability.Furthermore,the remarkable diffusion capability of Mg2+ ions,coupled with the increased proportion of 6-coordinated Mg2+ions,unveiled the mechanism underlying the precipitation of MgSiO3 and Mg2SiO4 crystals,which exhibited high Young’s moduli of 165.23 and 196.67 GPa,respectively.To prevent the precipitation of MgO-rich crystalline phases,it was crucial to maintain the M/(M+A)ratio below 0.42 and the C/(C+S)ratio below 0.16 within the MCAS system. 展开更多
关键词 MgO-CaO-Al2O3-SiO2system Molecular dynamics Thermodynamic calculation Structural evolution Crystallization characteristic Young’s modulus
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The effect of network structure on bounded confidence opinion dynamics 认领 引用
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作者 DU Miao CAI Jianfeng 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第2期521-533,共13页
Resolving conflict and achieving consensus among social groups with diverse opinions becomes a critical issue in today’s extensively connected society.Despite the ubiquitous heterogeneity of connection or contact pat... Resolving conflict and achieving consensus among social groups with diverse opinions becomes a critical issue in today’s extensively connected society.Despite the ubiquitous heterogeneity of connection or contact patterns,the study of how topological characteristics of network structure affect opinion convergence is still insufficient.Based on Deffuant and colleagues’bounded confidence model and the transformable network structure between random network and typical complex network types,including small-world network and scale-free network,we analyze the critical factors affecting continuous opinion convergence.We find that the network density plays a crucial role in the aggregated process of opinions in the social group,followed by the modularized level and the average shortest path length of the social network.However,the structural features have little impact on the consensus phase transition threshold.The further simulation experiments under real networks can be well understood based on the interplay of these three main factors.These findings confirm the paramount importance of creating a high-frequency and widely communicated atmosphere to mitigate conflict and efficiently reach consensus. 展开更多
关键词 consensus and divergence opinion dynamics bounded confidence model complex network
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Morphological and dynamic characteristics of abrasion on drainage structures in response to debris flow 认领 引用
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作者 YANG Dongxu LU Shuai +6 位作者 YOU Yong SUN Hao ZHAO Wanyu ZHOU Ziyi LI Yuanling ZHANG Jiajia WANG Dongpo 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1635-1652,共18页
Abrasion,a complex physical phenomenon prevalent in natural and engineered structures,frequently causes significant functional failures in drainage channels under the debris flow impact force.This underscores critical... Abrasion,a complex physical phenomenon prevalent in natural and engineered structures,frequently causes significant functional failures in drainage channels under the debris flow impact force.This underscores critical knowledge gaps regarding abrasion effects on debris flow-scoured drainage structures.Through multi-stage field investigations and data analysis across four representative areas,this study proposes a classification system for abrasion phenomena and analyzes morphological characteristics across different drainage structures and debris flow types(rainy vs.glacial).Further,the study methodically uncovers the long-term spatiotemporal distribution,development,and progression of abrasion in drainage channels and check dams.Dynamic abrasion characteristics were evaluated using three key parameters per debris flow:average gully vertical drop,watershed relative cutting degree,and soil sample data.The findings indicate that rainy debris flows exhibit higher average vertical drops(max:0.933)compared to glacial debris flows(max:0.621).Glacial debris flows show greater relative watershed cutting degrees(range:0.15–0.3)than rainy types(range:0.075–0.2).Multiple influencing factors were compared to identify critical controls on abrasion intensity.Debris flow velocity distribution and particle gradation within channels emerged as the primary determinants of abrasion distribution.Notably,a higher proportion of viscous particles(grain size D20%).These findings quantitatively inform the optimization of debris flow mitigation,providing a critical foundation for improving structural design,wear repair techniques,and channel configuration. 展开更多
关键词 Debris flow Drainage structure Dynamics characteristics Abrasion morphology Abrasive severity
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Revealing the dynamic recrystallization and deformation instability of TiC reinforced AZ61 composites with uniform structure and bimodal grain structure 认领 引用
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作者 Lingling Fan Ying Zeng +7 位作者 Lingbao Ren Yanyan huang Kunyang Fan Zhenyu Zhu Ran Ni Gaofeng Quan Wei Feng Hajo Dieringa 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期387-408,共22页
Although microstructural configuration significantly enhances composites’comprehensive mechanical properties,its influence on hot deformation remains unclear.To investigate the effects of microstructural configuratio... Although microstructural configuration significantly enhances composites’comprehensive mechanical properties,its influence on hot deformation remains unclear.To investigate the effects of microstructural configurations on hot workability,dynamic recrystallization(DRX)mechanisms and instability mechanisms,hot compression tests were conducted on two TiC/AZ61 composites(bimodal/uniform structures)with constitutive modeling,processing maps,and microstructure observations.The results show that uniform composite exhibits better hot workability,lower deformation activation energy(Q)and smaller instability regions than bimodal composite.The uniform composite primarily undergoes continuous DRX(CDRX),while the bimodal composite involves both CDRX and discontinuous DRX(DDRX)mechanisms.At low temperatures(T)and high strain rates(˙ε),the uniform composite achieves sufficient DRX,whereas the bimodal composite experiences only partial DRX accompanied by twinning.At high T and low˙ε,the uniform composite is prone to grain boundary sliding(GBS)due to fine grains,causing to micro-voids formation;the bimodal composite undergoes abnormal grain growth(AGG),leading to instability.The favorable hot-processing regions for the bimodal composite are(260-320℃,0.0009-0.03 s-1)and(325-370℃,0.0001-0.0003 s-1),while those for the uniform composite are(260-310℃,0.01-0.1 s-1)and(250-300℃,0.0001-0.0005 s-1).This work offers in-depth insights into DRX and deformation instability in magnesium matrix composites with different initial structures.It provides a guidance for their selection of hot working processes. 展开更多
关键词 Magnesium matrix composite Bimodal structure Hot deformation Dynamic recrystallization Deformation instability
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Computational Analysis of Autonomous Underwater Vehicles(AUVs)Structural Dynamics and Impact Forces During High Speed Water Entry 认领 引用
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作者 YU Yi-lan PAN Guang +1 位作者 SHI Yao HUANG Qiao-gao 《China Ocean Engineering》 SCIE EI CSCD 2026年第3期507-520,共14页
Understanding the structural response of Autonomous Underwater Vehicles(AUVs)during water entry is essential for ensuring operational safety and reliability.This paper introduces a bidirectional fluid-structure coupli... Understanding the structural response of Autonomous Underwater Vehicles(AUVs)during water entry is essential for ensuring operational safety and reliability.This paper introduces a bidirectional fluid-structure coupling numerical algorithm to analyze the structural response characteristics of an AUV during water entry at various speeds and angles.The numerical method’s accuracy is verified through experimental data.The investigation focuses on the water entry process within the velocity range of 50 to 200 m/s and entry angles between 60°and 90°.The study examines the influence of structural position,entry velocity,and entry angle on the structural response,while analyzing stress and strain at specific locations on the circular end face,cylindrical side,and circular tail surface of the AUV.The findings demonstrate that at entry speeds exceeding 100 m/s,the structure undergoes strain,with entry velocity exhibiting a more pronounced effect on axial force compared with entry angle.A reduced entry angle decreases the initial water contact duration and minimizes stress concentration.These results provide significant theoretical foundations for AUV structural design. 展开更多
关键词 AUV structural dynamics stress propagation water entry transmedia FSI
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Radar Data Assimilation with EnKF-IAU:Impacts on Dynamical Structure and Short-term Prediction of Landfalling Typhoon Bebinca(2024) 认领 引用
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作者 Zhaoyang HUO Wei HUANG +3 位作者 Gengjiao YE Mengjuan LIU Wanchen WU Yubao LIU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2026年第6期1226-1242,共17页
Landfalling tropical cyclones(LTCs)undergo rapid structural adjustments and complex nonlinear interactions in coastal regions,making short-term prediction of heavy rainfall and damaging winds particularly challenging.... Landfalling tropical cyclones(LTCs)undergo rapid structural adjustments and complex nonlinear interactions in coastal regions,making short-term prediction of heavy rainfall and damaging winds particularly challenging.Conventional intermittent data assimilation often introduces dynamical imbalances into the analysis fields,which may further deteriorate subsequent forecasts.This study investigates the landfall process of Typhoon Bebinca(2024)and systematically evaluates a set of ensemble-based assimilation experiments conducted within an Incremental Analysis Update(IAU)framework,incorporating multiple observation types,including radar reflectivity,Doppler radial velocity,and surface measurements.The results show that the IAU technique,through the gradual application of analysis increments within a four-dimensional time window,effectively suppresses initialization shocks,alleviates spurious dynamical imbalance,and preserves flowdependent coordination.The IAU-based framework efficiently retains observational information,optimizes vortex structure,intensifies the warm core,and promotes the formation of a vertically coherent subsidence column within the eye region,thereby strengthening the secondary circulation.In addition,the IAU scheme also helps establish a more consolidated and axisymmetric moisture core,accompanied by a sea-level pressure field with smoother and dynamically coherent gradient structures,indicating a more physically balanced thermodynamic–dynamic coupling.These balanced analyses translate into more accurate forecasts of track,intensity evolution,and landfall-induced precipitation.Overall,the IAU-enhanced ensemble assimilation system substantially improves the physical consistency of storm analyses and significantly increases the short-term predictability of LTC track,rainfall,and wind hazards over coastal urban regions. 展开更多
关键词 data assimilation incremental analysis update landfalling tropical cyclones model imbalances dynamical structure
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Investigation of dynamic seismic response in liquid-containing structures for nuclear reactors using the hybrid Eulerian-Lagrangian method 认领 引用
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作者 Shi-Lin Chen Qing-Xi Yang +3 位作者 Qing-Zhou Yu Hao Xu Jian Chen Zhao-Xi Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期159-177,共19页
Liquid-containing structures,including steam generators,water-cooling systems,in-containment refueling water storage tanks,suppression tanks,and tritiated water storage facilities,are integral components of nuclear re... Liquid-containing structures,including steam generators,water-cooling systems,in-containment refueling water storage tanks,suppression tanks,and tritiated water storage facilities,are integral components of nuclear reactor systems and are crucial for ensuring operational safety and stability.Traditional seismic analysis methods often struggle to accurately predict the dynamic behavior of such structures,particularly under transient events such as earthquakes.This paper presents a comprehensive study that applies the hybrid Eulerian-Lagrangian method to analyze fluid-structure interactions within these structures.The efficacy of this method for capturing the complex dynamics induced by liquid movement is demonstrated through simulations conducted primarily in a vertical storage tank.A comparative analysis with traditional response-spectrum analysis methods underscores the limitations of conventional approaches,particularly in terms of accounting for nonlinear free-surface motions and dynamic velocity distributions.The structural response of the tank containing liquid calculated using the hybrid Eulerian-Lagrangian method is approximately twice that calculated using the response-spectrum method,whereas in the case of a tank without liquid,the response is the same.Additionally,a high dynamic stress distribution exists near the liquid level of the structure.This study addresses the intricate interplay between structural components and fluid dynamics,thereby extrapolating insights from tanks to enhance safety protocols and design considerations for future nuclear devices. 展开更多
关键词 Liquid-containing structures Nuclear reactors Seismic analysis methods Hybrid Euler-Lagrangian method Complex dynamics
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Stability analysis and asymmetric structure control for surrounding rock of deep dynamic pressure weak roadway 认领 引用
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作者 JIANG Zaisheng XIAO Canjun +1 位作者 XIE Shengrong CHEN Dongdong 《Journal of Mountain Science》 SCIE CSCD 2026年第7期3356-3376,共21页
The control of surrounding rock in deep dynamic pressure weak roadways is a critical challenge for coal safe and efficient as underground engineering extends to greater depths.However,existing deep combined support te... The control of surrounding rock in deep dynamic pressure weak roadways is a critical challenge for coal safe and efficient as underground engineering extends to greater depths.However,existing deep combined support technologies lack a quantitative design theory that accounts for the dynamic migration of the deviatoric stress peak zone(DSPZ)in the surrounding rock and the evolution of yield moment points of the U-shaped steel shed under asymmetric pressure conditions.This leads to empirically determined cable lengths and layouts,ambiguous compensation of weak positions in the steel shed,and poor matching between grouting parameters and the anchorage range.To address this deficiency,a comprehensive investigation integrating field tests,laboratory experiments,numerical simulations,mechanical analysis,and engineering practice was conducted.Results show that:(1)The primary factors contributing to surrounding rock failure are high insitu stress combined with asymmetric mining-induced dynamic pressure,inherent weakness of the rock mass(uniaxial compressive strength of 10-15 MPa),largesection excavation(20 m2),and an unreasonable original support scheme.(2)The DSPZ migrates with the lateral pressure coefficient k:when k1,it shifts to the roof,floor,and shoulder corners;and when k=1,it distributes annularly around the roadway.(3)Active support components must fully penetrate the DSPZ,which forms the design criterion for cable length.(4)Under isobaric conditions,the most dangerous point of the U-shaped shed is at the column leg 1.2 m above the floor;under roof eccentric pressure,shoulder corner eccentric pressure,and rib eccentric pressure,the key compensation positions are the arch crown,the loaded shoulder corner plus shed legs,and both shed legs,respectively.(5)Alternating shallow hole(depth 3 m,pressure≥3 MPa)and deep hole(depth 8 m,grouting≥6 MPa)grouting repairs fractures in the excavation-disturbed zone and reinforces the fractured zone outside the anchorage range,establishing a gradient stress structure of“shallow constraint and deep load-bearing.”Based on these findings,a synergistic technology integrating“full-cable active anchoring,coupled reinforcement of the overall shed-cable system,asymmetric cable compensation at yield bending moment points of the U-shaped shed,and weak rock modification through alternating shallow and deep hole grouting”is proposed.Field application in the Dongpang Mine demonstrates that this technology effectively stabilizes the surrounding rock,confirming its practical viability for similar deep dynamic pressure weak roadways. 展开更多
关键词 Deep weak roadway Dynamic pressure Anchoring experiment Numerical simulation Steel structure analysis Asymmetric compensation
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Tuning spin-density separation via finite-range interactions:dimensionality-driven signatures in dynamic structure factors 认领 引用
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作者 Xiaoran Ye Yi Zhang +1 位作者 Ziheng Zhou Zhaoxin Liang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第2期179-192,共14页
Spin-density(charge)separation,marked by distinct propagation velocities of spin and density excitations,epitomizes strong correlations,historically confined to one-dimensional(1D)systems.The recent experimental work ... Spin-density(charge)separation,marked by distinct propagation velocities of spin and density excitations,epitomizes strong correlations,historically confined to one-dimensional(1D)systems.The recent experimental work of Dhar et al(2025 Nature 64253),using a weakly interacting 3D Bose-Einstein condensate of 133Cs atoms confined in a 2D optical lattice to realize spin-density separation and demonstrate boson anyonization,motivates a deeper exploration into how dimensionality and interactions govern quantum correlations.In this work,we investigate this in two-component bosonic mixtures with finite-range interactions,probing 1D and 3D dynamics.Using path integral effective field theory within the one-loop approximation,we derive analytical expressions for zero-temperature ground-state energy and quantum depletion,seamlessly recovering contact interaction results in the contact limit.By crafting an effective action for decoupled density and spin modes,we compute dynamic structure factors(DSFs),revealing how finite-range interactions sculpt spin-density separation.A pivotal finding is the dimensionality-driven divergence in DSF peak dynamics:in 1D,peaks ascend to higher frequencies with increasing interaction strength,yielding sharp responses;in 3D,peaks descend to lower frequencies,with broader density wave profiles.These insights highlight dimensionality's critical role in collective excitations and provide a robust theoretical blueprint for probing interaction-driven quantum phenomena via Bragg spectroscopy,paving new pathways for the exploration of dimensionally tuned quantum correlations in ultracold quantum gases. 展开更多
关键词 ultracold quantum gas effective field theory dynamical structure factor quantum depletion spin-density(charge)separation
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Structural and Helix Reversal Defects of Carbon Nanosprings:A Molecular Dynamics Study 认领 引用
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作者 Alexander V.Savin Elena A.Korznikova Sergey V.Dmitriev 《Computers, Materials & Continua》 SCIE EI 2026年第2期445-464,共20页
Due to their chiral structure,carbon nanosprings possess unique properties that are promising for nanotechnology applications.The structural transformations of carbon nanosprings in the form of spiral macromolecules d... Due to their chiral structure,carbon nanosprings possess unique properties that are promising for nanotechnology applications.The structural transformations of carbon nanosprings in the form of spiral macromolecules derived from planar coronene and kekulene molecules(graphene helicoids and spiral nanoribbons)are analyzed using molecular dynamics simulations.The interatomic interactions are described by a force field including valence bonds,bond angles,torsional and dihedral angles,as well as van derWaals interactions.While the tension/compression of such nanosprings has been analyzed in the literature,this study investigates other modes of deformation,including bending and twisting.Depending on the geometric characteristics of the carbon nanosprings,the formation of structural and helix reversal topological defects is described.During these structural transformations of the nanosprings,only van der Waals bonds break and recover,but breaking or recovery of covalent bonds does not take place.It is found that nanosprings demonstrate a significantly higher coefficient of axial thermal expansion than many metals and alloys.Under axial compression,Euler instability leads to lateral bending with continuous deformation of the nanospring axis at relatively low compression,while at high compression,bending kinks form.Various types of topological defects form on the instantly released nanospring during its relaxation from a highly stretched configuration.These results are useful for the development of nanosensors operating over a wide temperature range. 展开更多
关键词 Carbon nanospring graphene helicoid spiral nanoribbon chiral structure bending twisting topological defect thermal expansion molecular dynamics
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Boosting the intermittent alkaline seawater electrolysis stability up to 10,000h via in-situ formation of dynamically passivating structures 认领 引用
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作者 Bo Chen Peiyu Duan +1 位作者 Ying Zhang Lianhui Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第1期4-6,共3页
With the in-depth implementation of sustainable development strategies,hydrogen energy as a clean energy source is receiving increasing attention[1,2].Among the various methods of hydrogen production,the electrocataly... With the in-depth implementation of sustainable development strategies,hydrogen energy as a clean energy source is receiving increasing attention[1,2].Among the various methods of hydrogen production,the electrocatalytic decomposition of abundant seawater into hydrogen utilizing renewable energy has emerged as a green and promising approach.However,natural seawater contains complex components,such as halide ions,which lead to the corrosion of catalysts or the occurrence of competitive side reactions during the electrolysis process[3]. 展开更多
关键词 intermittent alkaline seawater electrolysis electrocatalytic decomposition renewable energy clean energy source sustainable development strategies halide ionswhich sustainable development strategieshydrogen energy dynamically passivating structures
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Environment-adaptive design of multilayer optical structures for surface polariton excitation via dynamic multi-objective optimization 认领 引用
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作者 Ru Lei Lin Li +4 位作者 Yiqi Feng Ziyue Ren Kun Zhang Lixun Sun Ting Mei 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第5期267-279,共13页
The graphene±dielectric multilayer architecture constitutes a fundamental and widely utilized platform for sustaining surface polariton(SP)propagation.Owing to their extraordinary prospects in defence critical te... The graphene±dielectric multilayer architecture constitutes a fundamental and widely utilized platform for sustaining surface polariton(SP)propagation.Owing to their extraordinary prospects in defence critical technologies,including radar-absorbing stealth coatings,high-power microwave shielding,and ultrafast optical switching,SPs have attracted intense and sustained interest.In this study,we develop an environment-adaptive design framework that models wavelength variation as a dynamic environmental change and automatically adjusts the design parameters in response.Our method employs a dynamic multi-objective optimization algorithm augmented with a predictive transfer strategy,optimizing SP coupling efficiency,structural compactness,and fabrication feasibility.Using a population history prediction mechanism,the framework not only adaptively generates multilayer designs across the full visible spectrum without full re-initialization,but also retains and exploits knowledge of how environmental variations influence the distribution of optimal solutions.This enables rapid adjustment of the optimization direction when parameters such as wavelength,angle,or doping change,thus avoiding the need to restart the search from scratch.Comprehensive comparisons demonstrate outstanding robustness under continuous wavelength shifts.The optimized graphene-coated distributed Bragg reflector(DBR)stacks achieve near-perfect absorption(>98%)at each individual wavelength across the visible spectrum.This work not only provides theoretical guidance for SP excitation experiments,but also contributes to the optimization of polariton device design,which is crucial for enhancing the performance of defence-related optical systems. 展开更多
关键词 Distributed bragg reflectors Surface polariton Dynamic multi-objective optimization
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Dynamic characteristics and vibration isolation performance of an integrated kangaroo bio-inspired vibration suppression structure 认领 引用
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作者 Shihua Zhou Zichun Zhou +3 位作者 Xinhai Yu Chenhui Zhou Pengyang Wang Zhaohui Ren 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期276-291,共16页
Inspired that kangaroo can buffer the impact and absorb vibration from the ground and keep the whole-body stable,an integrated kangaroo bio-inspired vibration suppression(IKBVS)structure considering vibration isolatio... Inspired that kangaroo can buffer the impact and absorb vibration from the ground and keep the whole-body stable,an integrated kangaroo bio-inspired vibration suppression(IKBVS)structure considering vibration isolation-absorption simultaneously is proposed for low/wide band frequency vibration control.Based on skeleton mass,articulation friction,and the synergistic action among skeleton,articulation,and muscleendon,a vibration suppression model with more biological basic characteristics is derived.The validity of model and method is confirmed,and the static and dynamic analysis of the IKBVS system is carried out to investigate the vibration suppression performance.The quasi-zero stiffness region can be achieved with a smaller initial installation angle,medium rod length,smaller foot stiffness,and slightly lighter isolated mass in a wide displacement interval.The coupling mechanism of vibration isolation-absorption is revealed by parameter analysis.The results indicate that the IKBVS structure has favorite dynamic properties due to adjustable nonlinearity,namely,lower and adjustable resonance and anti-resonance frequency/peak and different levels of vibration suppression effect in high-frequency range are achieved readily.This research provides new insight into application of bio-inspired vibration suppression structures in various engineering systems for better vibration control. 展开更多
关键词 IKBVS structure Vibration isolation-absorption Vibration transmission Quasi-zero stiffness
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