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Experimental study and 3D cellular automaton simulation of intergranular corrosion on laser-welded joints of Al-Cu-Li alloys under acidic conditions 认领 引用
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作者 Xinzhi Yang Gan Tian +4 位作者 Dejun Liu Biyun Ren Hui Cai Mengqing Liu Yan Zhang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期314-329,共16页
This study proposes a multi-scale research approach that integrates micro-characterization experiments and 3D cellular automata(CA)simulations to investigate the intergranular corrosion(IGC)behavior of equiaxed grains... This study proposes a multi-scale research approach that integrates micro-characterization experiments and 3D cellular automata(CA)simulations to investigate the intergranular corrosion(IGC)behavior of equiaxed grains in the fusion zone(FZ)of laser-welded joints of Al-Cu-Li alloys under acidic conditions.Combined with microscopic characterizations such as SEM and TEM,the significant segregation phe-nomenon of grain boundaries in the FZ of the laser welded joint of 2195-T8 aluminum-lithium alloy was revealed,and the typical morphologies of IGC in the FZ under two different concentrations of nitric acid were compared.Compared to the traditional CA model,the proposed approach uses the Voronoi method combined with experimental characterization data to reconstruct a polycrystalline micro-structural model.For the first time,the effects of grain boundary segregation and localized corrosion intensity on corrosion morphologies were incorporated.A CA model comprising seven cell types and five evolution rules was systematically developed,enabling the simulation of both overall uniform corrosion and localized grain boundary dissolution,as well as corrosion channel propagation in the FZ under acidic conditions.By employing neural network based parameter fitting,the model accurately captures the IGC depth evolution and the expansion characteristics of corrosion channels,thereby reproducing the local damage morphologies of the FZ after immersion corrosion.This study provides theoretical support for corrosion-resistant design of high-strength aluminum alloy welded joints and holds significant engineering value in enhancing the service life of aluminum components. 展开更多
关键词 Intergranular corrosion Cellular automata Simulation model Al-Cu-Li alloy
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Atomic-scale simulations and experimental insights into the effect of precipitates on the hemming performance of 6xxx Al alloys 认领 引用
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作者 Yucheng Ji Feng Ding +5 位作者 Jiahao Wen Wentao Qin Chenyang Yao Xiang Xiao Guojun Wang Chaofang Dong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1994-2005,I0017-I0025,共12页
Al–Mg–Si alloys are widely employed in automotive vehicles;however,challenges such as cracking often arise during the hemming process(180°bending).Based on the molecular dynamics simulations and experiments,thi... Al–Mg–Si alloys are widely employed in automotive vehicles;however,challenges such as cracking often arise during the hemming process(180°bending).Based on the molecular dynamics simulations and experiments,this study investigated the effects of the size and number of MgSi(Fe)clusters on the mechanical properties of 6xxx Al alloys.The results showed that medium-sized MgSi clusters(containing 10–19 atoms)at the grain boundaries(GBs)enhanced the strength of the GBs,effectively inhibiting crack initiation and significantly suppressing intergranular cracking.In addition,the ductility and brittleness of the model with the Fe-containing phase were significantly affected by the Si/Fe atomic ratio(~0.71).Tensile experiments confirmed that the failure morphology exhibited a distinct brittle fracture when the Si/Fe atomic ratio of the phase was 0.90.The pre-aging treatment promoted the dispersion of solute atoms,thereby reducing the yield strength of the AA6016 Al alloy to~120 MPa,which improved its hemming performance.Furthermore,preaging facilitated the generation of finer Mg–Si phases at the GBs during bake hardening. 展开更多
关键词 Al alloys cluster hemming performance molecular dynamics simulations
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Preliminary XFEL Experimental Simulation Platform Based on HSWAP Engine 认领 引用
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作者 LIU Jin DUAN Bowen +5 位作者 WEI Tao KANG Xu ZHAO Shicao DU Liangliang DENG Xiaoliang LI Xiaoya 《高压物理学报》 CAS CSCD 北大核心 2026年第6期42-51,共10页
X-ray free electron laser(XFEL)plays a critical role in diagnosing dynamic compression processes in micro-and meso-scale materials.To deepen our understanding of XFEL physics and optimize facility design,a preliminary... X-ray free electron laser(XFEL)plays a critical role in diagnosing dynamic compression processes in micro-and meso-scale materials.To deepen our understanding of XFEL physics and optimize facility design,a preliminary XFEL experimental simulation platform was developed based on the highperformance computing(HPC)simulation workflow application platform(HSWAP).HSWAP provides workflow,component,and data linkage models for XFEL experiments,enabling flexible simulation of diverse processes through modular configurations.This platform was employed to investigate X-ray diffraction(XRD)of microscale materials and phase contrast imaging(PCI)of meso-scale explosive samples.Simulation results for XRD of a metallic sample under shock loading and PCI of voids in explosive materials demonstrate the platform’s ability to accurately reproduce experimental dynamics.By integrating numerical models with data analysis,the platform enhances the design of XFEL experiments and provides a foundation for interpreting diagnostic capabilities in ultrafast processes.Future work will focus on refining simulation methods for meso-scale samples using phase-field approaches and high-Z materials under shock conditions. 展开更多
关键词 XFEL experimental simulation platform HSWAP engine X-ray diagnostics
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Unified light-thermal-diffusion coupling multi-mechanism kinetic model for gas-solid photocatalytic CO2 reduction with experimental and simulation validation 认领 引用
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作者 Shicheng Liu Du Wen +5 位作者 Jing Xiang Ng Junbo Yu Xiangyu Chen Lehang Chen Qulan Zhou Na Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第6期854-867,I0020,共14页
Photocatalytic CO2 reduction in gas–solid systems is a complex process that requires the integrated consideration of illumination,photocatalytic performance,and gas diffusion on the catalyst surface.Oversimplifica... Photocatalytic CO2 reduction in gas–solid systems is a complex process that requires the integrated consideration of illumination,photocatalytic performance,and gas diffusion on the catalyst surface.Oversimplification of these factors in existing computational fluid dynamics models severely compromises their predictive capability under realistic reaction conditions.To address this limitation,this study develops a multi-mechanism kinetic model that integrates photoexcitation,Arrhenius thermal activation,Langmuir adsorption saturation,and Thiele diffusion resistance within a unified kinetic expression.Model parameters were constrained and validated using a combination of first-principles calculations and multiscale optical,spectroscopic,adsorption,and transport measurements in a tree-shaped uniform-flow reactor.Photocatalytic experiments of four distinct catalysts are then used to validate the multi-mechanism kinetic model,with R2 above 0.98.Under model-derived conditions,the operation of the tree-shaped reactor achieve an optimal conversion rate of 116.7μmol g-1h-1.The model reliably predicts the experimental rates across a wide range of operating conditions.It also accurately captures the optimal space velocity range and the promotional effect of increasing temperature.This work offers a generalizable framework for the theoretical understanding,modelling,and scale-up of photocatalytic CO2 conversion systems. 展开更多
关键词 Photocatalytic CO2conversion Multi-mechanism kinetic model Density functional theory Experiment validation
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Coupled water-vapor-heat-salt transport mechanisms in sulfate saline soils under the pot cover effect:numerical simulation and experimental validation 认领 引用
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作者 ZHANG Ruiling CHOU Yaling +2 位作者 ZHANG Mingli ZHOU Fengxi LIU Hongbo 《Journal of Mountain Science》 SCIE CSCD 2026年第7期3477-3504,共28页
The pot cover effect can induce various forms of distress in cover layer engineering,such as salt heave,cracking,and differential settlement,with water vapor migration being the primary cause.However,current research ... The pot cover effect can induce various forms of distress in cover layer engineering,such as salt heave,cracking,and differential settlement,with water vapor migration being the primary cause.However,current research on the pot cover effect in saline soils rarely takes into account the water vapor transport process.Therefore,elucidating the coupled transport mechanisms of water,vapor,heat,and salt in saline soils under this effect is crucial for the prevention and control of related engineering hazards.This study developed a numerical model describing the coupled water-vapor-heat-salt transport in unsaturated saline sulfate soil and validated its reliability through laboratory unidirectional freezing column tests.Based on this model,a numerical analysis was conducted to investigate the formation mechanism of the pot cover effect during the unidirectional freezing of the saline soil.The results indicate that the moisture and salt fields exhibit a typical bimodal distribution pattern,with peaks located at the soil surface and the freezing front,respectively.Compared with the initial water content of 19% and initial salt content of 1%,the total water content at the surface and freezing front increased by 21% and 13%,respectively,while the total salt content rose by 1.25% and 0.5%,respectively.Liquid water flux upward in the unfrozen zone,while it approaches zero within the frozen zone.In contrast,both vapor flux and solute flux migrate upward throughout the entire soil column,reaching their maximum values at the freezing front.Compared to models that neglect vapor transport,the simulated total moisture content at the surface was 12% higher in the model accounting for vapor movement,indicating that water vapor migration is a key factor contributing to moisture accumulation at the surface.The findings of this study can provide a theoretical basis for preventing engineering hazards associated with the pot cover effect in saline soils. 展开更多
关键词 Seasonally frozen soil Pot cover effect Sulfate saline soil Water-vapor-heat-salt coupling Numerical simulation Moisture and salt transport
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Experimental and numerical simulation of gas injection for enhanced oil recovery in naturally fractured condensate gas reservoirs 认领 引用
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作者 Bin Ju Ping Guo +3 位作者 Yizhong Zhang Long Yang Zhouhua Wang Maolin Zhang 《Natural Gas Industry B》 2026年第2期164-191,共28页
Gas condensate reservoirs constitute important natural gas resources;however,their development is frequently hindered by condensate banking and complex multiphase flow behavior.Naturally fractured gas condensate reser... Gas condensate reservoirs constitute important natural gas resources;however,their development is frequently hindered by condensate banking and complex multiphase flow behavior.Naturally fractured gas condensate reservoirs present additional challenges because their dualporosity and dual-permeability structure induces strong phase redistribution and nonuniform flow between matrix and fracture systems,thereby complicating reservoir characterization and compositional simulation.In this study,integrated laboratory experiments and numerical simulations were performed for a deep,rich,naturally fractured gas condensate reservoir.Depletion,diffusion,and core flooding experiments involving CO2,N2,and dry gas injection were conducted using fractured core samples.A dual-porosity and dual-permeability compositional model incorporating a five-spot well pattern was established to evaluate condensate liquid recovery and to quantify mass transfer between matrix and fracture networks.The effect of matrix-fracture permeability contrast on production performance was systematically analyzed.The results indicate that matrix permeability is a primary parameter controlling recovery in gas condensate reservoirs.The ratio of matrix-fracture permeability contrasts exerts a stronger influence on condensate liquid recovery than on natural gas recovery.Pressure maintenance through gas injection is critical for improving recovery performance.When reservoir pressure declines below the dew-point pressure,early gas injection is recommended to mitigate condensate accumulation in the near-well region.Among the injected gases evaluated,CO2 demonstrated superior pressure maintenance performance compared with N2 and dry gas. 展开更多
关键词 Gas condensate reservoir Dual porosity and dual permeability Enhanced oil recovery Carbon capture Utilization and storage(CCUS) Numerical simulation
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Particle size ratios and ice content effects on rock-ice avalanche propagation and deposition:Flume experiments and DEM simulations 认领 引用 被引量：1
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作者 LUO Xin YANG Qingqing +1 位作者 HUO Zihao QIN Yao 《Journal of Mountain Science》 SCIE CSCD 2026年第1期221-236,共16页
Rock-ice avalanches in cold high-mountain regions pose severe hazards due to their high mobility,yet the quantitative controls of particle-size ratio and ice content remain insufficiently constrained.This study invest... Rock-ice avalanches in cold high-mountain regions pose severe hazards due to their high mobility,yet the quantitative controls of particle-size ratio and ice content remain insufficiently constrained.This study investigates their coupled effects using inclinedflume experiments and Discrete Element Method(DEM)simulations,covering three gravel sizes(2-5 mm,5-7 mm,7-10 mm)and four ice-content levels(0%,20%,40%,60%).Run-out distance,velocity,energy components,flow regime(Savage number),and segregation indexαwere quantified.Increasing ice content significantly enhances mobility,but with diminishing marginal effectiveness.From 0%to 40%ice content,run-out distance increases by 41%-86%,whereas the additional increase from 40%to 60%contributes only 12%-23%.Particle-size ratio strongly governs segregation intensity.Fine-gravel groups reach segregation indices ofα=0.92-0.98,indicating nearly complete upward migration of ice,whereas medium-gravel and coarse-gravel groups exhibit much weaker segregation,stabilizing atα=0.68-0.74 and 0.60-0.69.Savage number analyses reveal marked flow-regime transitions.At 0%ice content,Savage numbers reach 1.0-1.5,indicating a collisional regime.Increasing ice content suppresses collisionality,with Savage numbers decreasing to 0.03-0.07 at 60%ice content,consistent with dense-regime flow.DEM energy analyses confirm this regime shift:for finegravel mixtures,collision energy decreases by 14%,while sliding-friction energy increases by 33%as ice content increases from 0%to 60%,reflecting enhanced overburden effects imposed by upward-segregated ice layers.Medium and coarse mixtures exhibit weaker or opposite energy-shift patterns,demonstrating strong size dependence.Mechanistically,large particle-size contrasts promote strong segregation and form dense basal rock layers that increase basal friction and reduce mobility.When particle sizes are similar or ice content is high,segregation remains limited,allowing ice to mix into the basal layer,thereby reducing basal friction and enhancing mobility.This research quantitatively demonstrates how composition controls particle spatial distribution,flow regime,and energy dissipation,offering new mechanistic insights into the propagation and deposition behaviors of rock-ice avalanches and improving hazard assessment in vulnerable high-mountain regions. 展开更多
关键词 Rock-ice avalanche DEM Flume experiment Ice content Particle size ratio Segregation
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Performance of ALDFG Retrieval Apparatus in Tank Simulation Experiment 认领 引用
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作者 ZHANG Bo SONG Liming +1 位作者 YANG Haiwei LI Yuwei 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第3期1080-1094,I0051,I0052,共15页
To address the operational challenges associated with retrieving abandoned,lost,or otherwise discarded fishing gear(ALDFG),this study employed a mixed orthogonal experiment to systematically evaluate the effects of se... To address the operational challenges associated with retrieving abandoned,lost,or otherwise discarded fishing gear(ALDFG),this study employed a mixed orthogonal experiment to systematically evaluate the effects of seabed quality,grapnel configuration,dragging speed,and netting parameters on retrieval efficiency.The experiment was conducted in a controlled tank environment.The results showed no statistically significant difference in retrieval efficiency between the single-grapnel and double-grapnel configurations.The rocky and mixed mud-sand-rock seabeds exhibited significantly lower efficiency compared to mud,sand,and mud-sand seabeds.The small sharp grapnel achieved the highest retrieval efficiency,significantly outperforming other grapnel configurations.Within the 0.10-0.25 m/s range,dragging speed had a limited effect on retrieval efficiency.Larger netting sizes and mesh sizes were positively correlated with retrieval success rates.This study clarifies the compatibility mechanisms between seabed quality and retrieval configuration,offering a quantitative basis for optimizing grapnel-based ALDFG retrieval systems,particularly for heterogeneous seabed,and providing a technical framework for mitigating ALDFG pollution. 展开更多
关键词 ALDFG retrieval configuration seabed quality dragging speed orthogonal experiment tank simulation experiment
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Effects of intermediate principal stress on strainburst in granite:Insights from true-triaxial unloading experiments and PFC3D-GBM simulations 认领 引用
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作者 Hongru Li Manchao He +4 位作者 Tai Cheng Yafei Qiao Dongqiao Liu Jie Hu Yingming Xiao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期295-311,共17页
To improve the accuracy of rockburst risk evaluation in mining and tunnelling engineering,the influence of intermediate principal stress σ2 deserves further consideration,which has been neglected in general predic... To improve the accuracy of rockburst risk evaluation in mining and tunnelling engineering,the influence of intermediate principal stress σ2 deserves further consideration,which has been neglected in general prediction frameworks.This study employs an integrated approach that combines true-triaxial unloading experiments with three-dimensional grain-based discrete element modeling(PFC3D-GBM)to examine the effects of σ2 on strain systematically burst and elucidate the underlying mechanisms.Through this dual experimental–numerical methodology,the strainburst characteristics under varying σ2 are analyzed in detail regarding mechanical responses,failure evolution and patterns,microscope fracture mechanisms,and energy partitioning.The results indicate that elevated σ2 can enhance the bearing capacity of rock,thereby necessitating a higher stress condition required for strainburst.However,it also enlarges the potential strainburst intensity,manifesting as deeper rockburst pits and more violent ejection of rock fragments.An increasing σ2 facilitates the microscope transgranular fractures,inhibits intergranular tensile fractures,and raises the kinetic energy conversion ratio slightly.It affects the intensity of strainburst through the following mechanisms,including the increase of energy storage limit,the intensification of Poisson effect for lateral expansion,and the enhancement of the transgranular fracturing mechanism.In practical engineering,the depth and range of support needs to be ensured under high σ2 conditions,and it is recommended to use prestressing techniques to control the development of significant slabbing. 展开更多
关键词 Rockburst Intermediate principal stress True-triaxial experiment 3D grain-based model
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Unraveling the intricate solvent-catalyst interplay in TS-1 catalyzed benzene hydroxylation:Experimental and molecular simulation insights 认领 引用
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作者 Yingdi Jiang Wanbin Zhan +4 位作者 Chao Yang Jing Zhang Changjiu Xia Gang Qian Xuezhi Duan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第4期37-49,共13页
The direct hydroxylation of benzene with hydrogen peroxide(H2O2)over titanium silicalite-1(TS-1)offers an environmentally benign route to phenol,though its efficiency is highly dependent on the solvent environme... The direct hydroxylation of benzene with hydrogen peroxide(H2O2)over titanium silicalite-1(TS-1)offers an environmentally benign route to phenol,though its efficiency is highly dependent on the solvent environment.By integrating experimental and theoretical approaches,this study reveals the underlying mechanism.Water uniquely boosts benzene conversion to 45.8%through synergistic effects.It serves as a proton-transfer mediator to lower the activation barrier(ΔG),enhances the electrophilicity of Ti-active sites via increased maximum electrostatic potential(ESPmax),and leverages the hydrophobic pores of TS-1 to enrich benzene near the active sites.However,this multifunctional enhancement also promotes over-oxidation,limiting phenol selectivity to 42.8%.In contrast,the organic solvents suppress consecutive oxidation and achieve high selectivity above 70%due to their larger HOMO-LUMO energy gaps(Egap).Yet they exhibit low activity owing to higher energy barriers,weaker electrophilicity,and competitive adsorption.This work further establishes quantitative correlations between catalytic performance and key descriptors such asΔG,ESPmax,and Egap,providing a predictive framework for rational solvent selection in TS-1 catalysis. 展开更多
关键词 Benzene Hydroxylation TS-1 Solvents Molecular simulation
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Computer Simulation and Experimental Approach in the Investigation of Deformation and Fracture of TPMS Structures Manufactured by 3D Printing 认领 引用
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作者 Nataliya Kazantseva Nikolai Saharov +2 位作者 Denis Davydov Nikola iPopov Maxim Il’inikh 《Computers, Materials & Continua》 SCIE EI 2026年第4期578-595,共18页
Because of the developed surface of the Triply PeriodicMinimumSurface(TPMS)structures,polylactide(PLA)products with a TPMS structure are thought to be promising bio soluble implants with the potential for targeted dru... Because of the developed surface of the Triply PeriodicMinimumSurface(TPMS)structures,polylactide(PLA)products with a TPMS structure are thought to be promising bio soluble implants with the potential for targeted drug delivery.For implants,mechanical properties are key performance characteristics,so understanding the deformation and failure mechanisms is essential for selecting the appropriate implant structure.The deformation and fracture processes in PLA samples with different interior architectures have been studied through computer simulation and experimental research.Two TPMS topologies,the Schwarz Diamond and Gyroid architectures,were used for the sample construction by 3D printing.ANSYS software was utilized to simulate compressive deformation.It was found that under the same load,the vonMises stresses in the Gyroid structure are higher than those in the Schwartz Diamond structure,which was associated with the different orientations of the cells in the studied structures in relation to the direction of the loading axis.The deformation process occurs in the local regions of the studied TPMS structures.Maximum von Mises stresses were observed in the vertical parts of the structures oriented along the load direction.It was found that,unlike the Gyroid,the Schwartz Diamond structure contains a frame that forms unique stiffening ribs,which ensures the redistribution of the load under the vertical loading direction.An analysis of the mechanical characteristics of PLA samples with the Schwartz Diamond and Gyroid structures produced by the Fused Deposition Modeling(FDM)method was correlated with computer simulation.The Schwarz Diamond-type structure was shown to have a higher absorption energy than the Gyroid one.A study of the fracture in PLA samples with various cell sizes revealed a particular feature related to the samples’periodic surface topology and the 3D printing process.Scanning electron microscopic(SEM)studies of the samples deformed by compression showed thatwith an increase in the density of the samples,the failure mechanism changes from ductile to quasi-brittle due to the complex participation of both cell deformation and fiber deformation. 展开更多
关键词 Computer simulation TPMS structure deformation fracture SEM 3D printing
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Arginine-derived inhibitor-based anticorrosion coating for carbon steel in 3-nitro-1,2,4-triazol-5-one (NTO) medium: Integration of experimental and multiscale simulations 认领 引用
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作者 Ziyang Guo Zhe Zhang +3 位作者 Shuai Zhao Manman Wang Yujie Qiang Qinghai Shu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第3期307-322,共16页
As a representative insensitive high explosive,3-nitro-1,2,4-triazol-5-one(NTO)has garnered significant attention due to its ability to substantially reduce the risk of accidental detonation in munitions.However,its i... As a representative insensitive high explosive,3-nitro-1,2,4-triazol-5-one(NTO)has garnered significant attention due to its ability to substantially reduce the risk of accidental detonation in munitions.However,its inherent acidity induces severe interfacial corrosion of metal casings,thereby limiting its engineering applications.Based on the micro-corrosion mechanism of NTO on carbon steel(CS),this study designs an arginine-derived corrosion inhibitor,N2-[(phenylamino)thioxomethyl]-arginine(PTA).Electrochemical tests reveal that PTA exhibits an outstanding corrosion inhibition efficiency of 98.0%in NTO solution.Density functional theory(DFT)and molecular dynamics(MD)simulations elucidate the inhibition mechanism of PTA,demonstrating that it not only co-adsorbs with NTO− onto the CS surface to form a dense and stable protective film but also disrupts the strong interactions between NTO− and Fe,thereby suppressing nitro group-induced reduction,decomposition,and excessive surface oxidation.Furthermore,a PTA-loaded mesoporous silica(mSiO2)nanoparticles(NPs)-reinforced epoxy resin(EP)composite coating was constructed.Benefiting from the enhanced barrier properties of PTA@mSiO2 NPs and the synergistic effect between PTA and NTO−,the low-frequency impedance of the composite coating remained as high as 1.29×109Ω·cm2 after 30 days of immersion in NTO solution,exhibiting a two-order-of-magnitude improvement compared to the pure EP coating.This study proposes an effective corrosion control strategy to mitigate NTO-induced corrosion,providing insights into the development of advanced corrosion protection strategies for broader applications. 展开更多
关键词 Carbon steel 3-Nitro-1,2,4-triazol-5-one Corrosion inhibitor Composite coating Multiscale simulations
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Micrometer-scale pore collapse mechanisms in shocked HMX single crystal:Experiments and simulations 认领 引用
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作者 Hanyu Wang Xiao Ma +8 位作者 Yuncan Ma Genbai Chu Kai Ding Shaoyong Tu Hua Fu Xianxu Zheng Xinjie Wang Zhurong Cao Fenglei Huang 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第3期121-133,共13页
Pore collapse is a fundamental mechanism governing hotspot formation during shock initiation of high explosives. In this paper, shock-induced micrometer-scale pore collapse responses in cyclotetramethylene tetranitram... Pore collapse is a fundamental mechanism governing hotspot formation during shock initiation of high explosives. In this paper, shock-induced micrometer-scale pore collapse responses in cyclotetramethylene tetranitramine(HMX) single crystals are systematically investigated through integrated shock experiments and numerical simulations. A multimodal experimental and diagnostic platform integrating laser-driven compression, sub-nanosecond temporal-resolution X-ray imaging, and multipoint photonic Doppler velocimetry, is developed to analyze the 200 μm cylindrical pore collapse mechanisms in shocked HMX crystals for the first time. A novel model is developed that includes nonlinear thermoelastic, pressure-dependent viscoplastic, and new melting criteria, which can effectively reproduce experimental observations of two distinct collapse regimes. A regime transition is found from an integral collapse mechanism under weak shock loading(12 GPa)to a jet collapse mechanism under high shock loading(23 GPa). Pore collapse occurs with symmetrical shear band formation(±45° relative to shock direction) at 12 GPa, while jet formation is initiated and propagates downstream at 23 GPa. Parametric analysis further quantifies size effects, showing that the pore diameter obviously influences the pore collapse rate in low-pressure regimes, but becomes negligible under high pressures. The findings presented here could establish the groundwork for development of shock initiation models with improved predictive ability. 展开更多
关键词 pore collapse numerical simulationsa hotspot formation integrated shock experiments multimodal experimental diagnostic platform cyclotetramethylene tetranitramine hmx single high explosivesin laserdriven compressionsub nanosecond
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Understanding of a sudden shift from foehn to late spring cold span on the north slope of the Middle Tianshan Mountains with meteorological observation and terrain sensitivity simulation experiments 认领 引用
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作者 AYITIKAN Maoling AIDING Alaiyi +6 位作者 MUSHA Yusufu HE Qing YANG Chengguang HANAN Wulifan LI Shuting ZHONG Yuting CHENG Kai 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1439-1456,共18页
The north slope of the Middle Tianshan Mountains(NS-MTM),characterized by a distinctive basin-mountain-canyon topography,is frequently impacted by strong foehn winds and late spring cold span(LSCS).To better understan... The north slope of the Middle Tianshan Mountains(NS-MTM),characterized by a distinctive basin-mountain-canyon topography,is frequently impacted by strong foehn winds and late spring cold span(LSCS).To better understand these phenomena,this study investigates a typical foehn-to-LSCS event that occurred in the spring of 2018.Using conventional meteorological observations and ERA5 reanalysis data,we analyze the evolution of surface meteorological elements and the associated atmospheric circulation patterns.Furthermore,the role of topography is explored through WRF(Weather Research and Forecasting)model sensitivity experiments with reduced mountain terrain altitudes.The key findings are as follows:(1)The LSCS occurred immediately following the foehn event,resulting in a rapid transition from dry,hot,and strong southeasterly winds to wet,cold,and strong northwesterly winds.The foehn was primarily triggered by a pressure drop ahead of a surface cold front,whereas the LSCS was induced by a strong frontal zone at the base of a midto-high-level trough.(2)During the active foehn stage,the"gorge tube effect"caused the southeasterly winds to become more uniform and significantly intensified wind speeds within the canyon.In contrast,during the LSCS,the canyon topography had little influence on the northwesterly wind direction,but its enhancing effect on wind speed was even more pronounced than during the foehn period.(3)The canyon topography facilitated a decline in surface air temperature within the canyon area.Its influence on relative humidity was negative during the foehn period but became positive during the LSCS when northwesterly winds prevailed.Moreover,with the inflow of strong cold air,the increase in canyon humidity was more substantial.In conclusion,the"gorge tube effect"is a major factor driving variations in the wind,temperature,and humidity fields during the coupled foehn and LSCS processes on the NS-MTM.These results underscore the critical role of canyon terrain in modulating local meteorological changes and highlight the necessity of considering such topographic effects in weather forecasting and warning operations. 展开更多
关键词 Foehn wind Late spring cold span(LSCS) North slope of the Middle Tianshan Mountains(NSMTM) Meteorological observation Complex terrain Numerical simulation
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Study on the Experimental Teaching of College English Virtual Simulation Four-Ring Linkage 认领 引用
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作者 WANG Huan 《Sino-US English Teaching》 2026年第2期57-61,共5页
As the information technology has developed rapidly,smart education has become a significant developing way in the field of education.In the“Teaching Requirements for College English Courses”,the virtual simulation ... As the information technology has developed rapidly,smart education has become a significant developing way in the field of education.In the“Teaching Requirements for College English Courses”,the virtual simulation technology used in the teaching of college English courses requires advanced multimedia and network technology support,as well as a rich and large number of course background resources.This study focuses on college English teaching,innovatively proposes a virtual simulation four-ring linkage experimental teaching model,and illustrates the process of the model in composition and implementation.The study results show that the model has an important impact on improving college students’comprehensive English abilities,learning interests and self-learning abilities,and gives new opinions and ways for the reform of college English teaching in universities. 展开更多
关键词 smart education college English virtual simulation four-ring linkage
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Federated Experiments:Generative Causal Inference Powered by LLM-based Agents Simulation and RAG-based Domain Docking 认领 引用 被引量：2
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作者 De-Yu Zhou Xiao Xue +5 位作者 Qun Ma Chao Guo Li-Zhen Cui Yong-Lin Tian Jing Yang Fei-Yue Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第7期1301-1304,共4页
COMPUTATIONAL experiments method is an essential tool for analyzing,designing,managing,and integrating complex systems.However,a significant challenge arises in constructing agents with human-like characteristics to f... COMPUTATIONAL experiments method is an essential tool for analyzing,designing,managing,and integrating complex systems.However,a significant challenge arises in constructing agents with human-like characteristics to form an AI society.Agent modeling typically encompasses four levels:1)The autonomy features of agents,e.g.,perception,behavior,and decision-making;2)The evolutionary features of agents,e.g.,bounded rationality,heterogeneity,and learning evolution;3)The social features of agents,e.g.,interaction,cooperation,and competition;4)The emergent features of agents,e.g.,gaming with environments or regulatory strategies.Traditional modeling techniques primarily derive from ABMs(Agent-based Models)and incorporate various emerging technologies(e.g.,machine learning,big data,and social networks),which can enhance modeling capabilities,while amplifying the complexity[1]. 展开更多
关键词 autonomy features generative causal inference complex systems llm based agents simulation federated experiments rag based domain docking computational experiments method agent modeling
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Formation and evolution of thiadiamondoids in petroleum:Evidence from thermochemical sulfate reduction simulation experiments with 1,3-dimethyladamantane 认领 引用 被引量：2
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作者 Anlai Ma Zhaowen Zhan +2 位作者 Cuishan Zhu Yunpeng Wang Jinzhong Liu 《Energy Geoscience》 EI CAS CSCD 2025年第3期223-238,共16页
Thiadiamondoids(TDs)have recently attracted increasing attention as molecular proxies for thermochemical sulfate reduction(TSR)reactions in reservoirs.However,their formation mechanisms,as well as the generation and e... Thiadiamondoids(TDs)have recently attracted increasing attention as molecular proxies for thermochemical sulfate reduction(TSR)reactions in reservoirs.However,their formation mechanisms,as well as the generation and evolution processes,remain poorly understood.In this study,simulation experiments with a duration of 160 h were conducted on the model compound 1,3-dimethyladamantane(1,3-DMA)using the CaSO4,MgSO4,and elemental S systems,with measurements at the 10th,20th,40th,80th and 160th hours during the simulation process being presented.The results indicate that at the end of simulation,the MgSO4 system exhibited the lowest residual amounts of 1,3-DMA,suggesting the highest degree of TSR.Four types of non-hydrocarbon compounds with adamantane structures were detected in the liquid products in the three experiment systems:adamantanones,adamantanols,adamantanethiols(ATs),and thiaadamantanes(TAs).Among these,adamantanones exhibited the highest concentrations in the three simulation systems.In addition,TAs were dominated by C3-TAs in the CaSO4 and MgSO4 systems and by C2-TAs in the elemental S system.The simulation experiments revealed a strong correlation between the concentrations of TAs and adamantanones,suggesting that adamantanones might be the intermediates for TAs.Combined with the synthesis mechanism of TAs from thiaadamamantane-4,8-dione,TDs might have two different genetic mechanisms:(a)low temperature cationic carbon ion rearrangement from diagenesis to early catagenesis stage,and(b)a free sulfur radical mechanism in high-temperature TSR process during middle-late catagenesis.TAs exhibited different generation and evolution processes across different experiment systems.Notably,the MgSO4 system revealed that TAs undergo generation,accumulation,and destruction process,corresponding to Easy%Ro values of 0.89%-0.98%,0.98%-1.21%,and>1.21%,respectively.Among these three simulation systems,dibenzothiophenes(DBTs)concentrations consistently trended upwards,indicating TAs have lower thermal stability than DBTs. 展开更多
关键词 Thiadiamondoids(TDs) Dibenzothiophenes(DBTs) Thermal stability Thermochemical sulfate reduction(TSR) Simulation experiment
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Structural physical simulation experiment on vertical growth process of strike-slip faults in ultra-deep strata of Tarim Basin,NW China 认领 引用 被引量：1
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作者 NENG Yuan XIE Zhou +5 位作者 SHAO Longfei RUAN Qiqi KANG Pengfei ZHANG Jianan TIAN Zhiwen LIU Genji 《Petroleum Exploration and Development》 SCIE 2025年第5期1179-1192,共14页
In the ultra-deep strata of the Tarim Basin,the vertical growth process of strike-slip faults remains unclear,and the vertical distribution of fractured-cavity carbonate reservoirs is complex.This paper investigates t... In the ultra-deep strata of the Tarim Basin,the vertical growth process of strike-slip faults remains unclear,and the vertical distribution of fractured-cavity carbonate reservoirs is complex.This paper investigates the vertical growth process of strike-slip faults through field outcrop observations in the Keping area,interpretation of seismic data from the Fuman Oilfield,Tarim Basim,NW China,and structural physical simulation experiments.The results are obtained mainly in four aspects.First,field outcrops and ultra-deep seismic profiles indicate a three-layer structure within the strike-slip fault,consisting of fault core,fracture zone and primary rock.The fault core can be classified into three parts vertically:fracture-cavity unit,fault clay and breccia zone.The distribution of fracture-cavity units demonstrates a distinct pattern of vertical stratification,owing to the structural characteristics and growth process of the slip-strike fault.Second,the ultra-deep seismic profiles show multiple fracture-cavity units in the strike-slip fault zone.These units can be classified into four types:top fractured,middle connected,deep terminated,and intra-layer fractured.Third,structural physical simulation experiments and ultra-deep seismic data interpretation reveal that the strike-slip faults have evolved vertically in three stages:segmental rupture,vertical growth,and connection and extension.The particle image velocimetry detection demonstrates that the initial fracture of the fault zone occurred at the top or bottom and then evolved into cavities gradually along with the fault growth,accompanied by the emergence of new fractures in the middle part of the strata,which subsequently connected with the deep and shallow cavities to form a complete fault zone.Fourth,the ultra-deep carbonate strata primarily develop three types of fractured-cavity reservoirs:flower-shaped fracture,large and deep fault and staggered overlap.The first two types are larger in size with better reservoir conditions,suggesting a significant exploration potential. 展开更多
关键词 strike-slip fault vertical growth evolution process structural physical simulation experiment Ordovician fractured-cavity carbonate reservoir ultra-deep Tarim Basin Fuman oilfield
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Plastic flow and interfacial bonding behaviors of embedded linear friction welding process:Numerical simulation combined with thermophysical experiment 认领 引用 被引量：1
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作者 Tiejun MA Zhenguo GUO +6 位作者 Xiawei YANG Junlong JIN Xi CHEN Jun TAO Wenya LI Achilles VAIRIS Liukuan YU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期87-98,共12页
In this study,a new linear friction welding(LFW)process,embedded LFW process,was put forward,which was mainly applied to combination manufacturing of long or overlong loadcarrying titanium alloy structural components ... In this study,a new linear friction welding(LFW)process,embedded LFW process,was put forward,which was mainly applied to combination manufacturing of long or overlong loadcarrying titanium alloy structural components in aircraft.The interfacial plastic flow behavior and bonding mechanism of this process were investigated by a developed coupling EulerianLagrangian numerical model using software ABAQUS and a novel thermo-physical simulation method with designed embedded hot compression specimen.In addition,the formation mechanism and control method of welding defects caused by uneven plastic flow were discussed.The results reveal that the plastic flow along oscillating direction of this process is even and sufficient.In the direction perpendicular to oscillation,thermo-plastic metals mainly flow downward along welding interface under coupling of shear stress and interfacial pressure,resulting in the interfacial plastic zone shown as an inverted“V”shape.The upward plastic flow in this direction is relatively weak,and only a small amount of flash is extruded from top of joint.Moreover,the wedge block and welding components at top of joint are always in un-steady friction stage,leading to nonuniform temperature field distribution and un-welded defects.According to the results of numerical simulation,high oscillating frequency combined with low pressure and small amplitude is considered as appropriate parameter selection scheme to improve the upward interfacial plastic flow at top of joint and suppress the un-welded defects.The results of thermo-physical simulation illustrate that continuous dynamic recrystallization(CDRX)induces the bonding of interface,accompanying by intense dislocation movement and creation of many low-angle grain boundaries.In the interfacial bonding area,grain orientation is random with relatively low texture density(5.0 mud)owing to CDRX. 展开更多
关键词 Embedded linear friction welding Plastic flow Interfacial bonding behavior Numerical simulation Thermo-physical simulation Temperature field Dynamic recrystallization
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Boundary fluid constraints during electrochemical jet machining of large size emerging titanium alloy aerospace parts in gas–liquid flows:Experimental and numerical simulation 认领 引用 被引量：3
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作者 Yang LIU Ningsong QU +1 位作者 Hansong LI Zhaoyang ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期115-130,共16页
Large size titanium alloy parts are widely used in aerospace.However,they are difficult to manufacture using mechanical cutting technology because of severe tool wear.Electrochemical jet machining is a promising techn... Large size titanium alloy parts are widely used in aerospace.However,they are difficult to manufacture using mechanical cutting technology because of severe tool wear.Electrochemical jet machining is a promising technology to achieve high efficiency,because it has high machining flexibility and no machining tool wear.However,reports on the macro electrochemical jet machining of large size titanium alloy parts are very scarce,because it is difficult to achieve effective constraint of the flow field in macro electrochemical jet machining.In addition,titanium alloy is very sensitive to fluctuation of the flow field,and a turbulent flow field would lead to serious stray corrosion.This paper reports a series of investigations of the electrochemical jet machining of titanium alloy parts.Based on the flow analysis and experiments,the machining flow field was effectively constrained.TB6 titanium alloy part with a perimeter of one meter was machined.The machined surface was smooth with no obvious machining defects.The machining process was particularly stable with no obvious spark discharge.The research provides a reference for the application of electrochemical jet machining technology to achieve large allowance material removal in the machining of large titanium alloy parts. 展开更多
关键词 Electrochemical jet machining Titanium alloys Large size parts Flow simulation Turbulent flow
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