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3D morphological characteristics of shrinkage porosities and their relationship with microstructures in Mg−12Al magnesium alloy 认领 引用
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作者 Chuang-ming LI Ang ZHANG +6 位作者 Yong-feng LI Heng-rui HU He LIU Yu-yang GAO Zhi-hua DONG Bin JIANG Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期96-111,共16页
The dependence of shrinkage porosities on microstructure characteristics of Mg−12Al alloy was investigated.The distribution,morphology,size,and number density of shrinkage porosities were analyzed under different cool... The dependence of shrinkage porosities on microstructure characteristics of Mg−12Al alloy was investigated.The distribution,morphology,size,and number density of shrinkage porosities were analyzed under different cooling rates.The relationship between shrinkage porosities and microstructure characteristics was discussed in terms of temperature conditions,feeding channel characteristics,and feeding capacity.Further,the feeding behavior of the residual liquid phase in the solid skeleton was quantified by introducing permeability.Results show a strong correlation between the solid microstructure skeleton and shrinkage porosity characteristics.An increase in permeability corresponds to a declining number density of shrinkage porosities.This study aims to provide a more complete understanding how to reduce shrinkage porosities by controlling microstructure characteristics. 展开更多
关键词 Mg−12Al alloy shrinkage porosity solidification microstructure characteristics morphological characteristics
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Correction:Bubble and flow characteristics in EAF with multi-mode bottom blowing 认领 引用
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作者 Xing-Yu Liu Xiao-Yu Guo +4 位作者 Li-Hui Han Liang Ren Gui-Bin Jia Wei Yan Jing Li 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期224-225,共2页
The publication of this article unfortunately contained mistakes.Figures 11 and 12 were the same.The corrected Fig.12 is given below.
关键词 multi mode bottom blowing bubble characteristics EAF flow characteristics
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Multi-pass intermittent local loading process of large-scale rib-web component:Forming characteristics and implementing apparatus 认领 引用 被引量：3
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作者 Dawei ZHANG Peng DONG +2 位作者 Jingxiang LI Zijian YU Shengdun ZHAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期601-625,共25页
The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and redu... The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and reduce forming loads.However,the absence of compatible forming equipment makes it difficult to control the constraint in the unloaded zones during the forming process.This difficulty complicates coordination and control of deformation,particularly for asymmetric rib-web components.Additionally,the current implementation involves multi-fire heating,a long process flow,and high energy consumption,which limits the popularization and application of the local loading process.In this study,a new multi-pass local loading hydraulic forming apparatus that can quickly and reliably switch between heavy-load deformation and low-load constraint for different local loading sub-dies was developed.A 10-tonne laboratory prototype was developed,and the forming characteristics during the forming process as well as the response characteristics of the hydraulic system during the multi-pass intermittent local loading of rib-web component were investigated using numerical simulations and physical experiments.Results indicated that,compared to a whole loading process with the same initial geometry of billet,the total forming load(i.e.,the sum of loaded and restrained loads)is reduced by more than 40%with the local loading process,and by nearly 50%with multi-pass local loading.The multi-pass local loading process allows for more effective control of material flow compared to single-pass local loading,leading to improved cavity filling and reduced flow line disturbance.For a large-scale,complex titanium alloy bulkhead,the cavity filling problem was addressed by optimizing the multi-pass local loading path with an unequal thickness billet.The dynamic performance of the multi-pass local loading hydraulic system was found to be robust,with stable pressure transitions during motion and load switching for the sub-die(s).The dynamic characteristic of the hydraulic cylinder when switching from non-moving/unloaded state to a moving/loading state are consistent whether a load is present or not.However,the dynamic characteristics differ when switching from a moving/loading state to non-moving/unloaded state,showing opposite behavior.The developed hydraulic drive mechanism provides a way for implementation of multi-pass local loading without auxiliary operation and extra heating.The results of the study provide a foundation for the industrial production of large-scale,complex components with reduced force requirement and low-energy consumption. 展开更多
关键词 Forming characteristics Hydraulic system Intermittent local loading process Material flow Rib-web component
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Pullout response and failure characteristics of anchorage system in hard rocks 认领 引用 被引量：1
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作者 Chuanqing Zhang Qiangqiang Zhang +2 位作者 Qiang Cui Xunguo Zhu Qiming Xie 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1966-1991,共26页
The axial load-bearing capacity of grouted anchorage systems is critical for rock reinforcement and reflects the interactions among system components.Hence,the mechanical response and failure characteristics of the an... The axial load-bearing capacity of grouted anchorage systems is critical for rock reinforcement and reflects the interactions among system components.Hence,the mechanical response and failure characteristics of the anchorage system under axial loading are of vital importance.They serve as the foundation for establishing the mechanical model of the anchorage system and provide significant guidance for the optimization design of bolts and the assessment of anchorage conditions.However,as the most widely used research method,current pullout tests have not paid sufficient attention to simulating actual rock mass stiffness,have not fully revealed the radial mechanical response during the pullout process,and have not clarified the locations and modes of pullout failure.To address these issues,a testing method simulating hard rock stiffness and strength was developed using elasticity and stiffness equivalence theories.Tests revealed three anchorage failure modes under equivalent hard rock stiffness:tooth cutting,sliding,and sliding-tooth cutting composite failure,with the composite failure being dominant.The pullout load-displacement curves exhibited bimodal patterns for composite failure and single peaks for tooth cutting and sliding failures.Post-peak softening showed up-convex curves for tooth cutting and down-concave curves for sliding failure,while bolt yielding displayed distinct plateaus.The radial stress trends at the rock-grout interface paralleled pullout load curves,with sliding failure exhibiting approximately 10 MPa lower peak radial stress compared to tooth cutting failure.Anchorage length most strongly affected peak load,while grout properties predominantly governed failure mode. 展开更多
关键词 Anchorage system Pullout test Failure characteristics Mechanical responses Stiffness
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Planting density affects yield of indica-japonica hybrid rice by regulating population and photosynthetic characteristics 认领 引用 被引量：1
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作者 Kailiang Mi Yiyin Lu +3 位作者 Fangfu Xu Yanju Yang Haipeng Zhang Hongcheng Zhang 《The Crop Journal》 SCIE CSCD 2026年第2期592-605,共14页
To increase the yield of indica-japonica hybrid rice,it is crucial to explore their photosynthetic and population characteristics at different yield levels and quantify their response to varying planting densities.In ... To increase the yield of indica-japonica hybrid rice,it is crucial to explore their photosynthetic and population characteristics at different yield levels and quantify their response to varying planting densities.In this study,a two-year field experiment was conducted to test two indica-japonica hybrid rice varieties with different yield potentials(12 t ha-1and 15 t ha-1,respectively)at four planting densities(D1:21 cm×30 cm;D2:18 cm×30 cm;D3:16 cm×30 cm;D4:14 cm×30 cm).High yield indicajaponica hybrid rice was primarily charcterized by a high number of spikelets per panicle and a greater spikelet weight,which increased the single panicle's weight.In addition,rational material translocation and a coordinated source-sink relationship contributed to dry matter accumulation.Open plant morphology optimized leaf enzyme activity at all stages,improved photosynthesis,and increased yield by 20.54%-21.60%.Increasing the planting density of indica-japonica hybrid rice somewhat restricted the growth of the rice population,leading to decreases in spikelets per panicle,1000-grain weight,seed-setting rate,plant height,length of the top three leaves,leaf width,leaf angle,and the number of primary and secondary branches.However,the higher number of basic seedling resulted in more effective panicles and an increase in total spikelets,increasing the yield of each variety by 4.17%-8.48%and 2.39%-12.71%,respectively.Optimum dense planting of indica-japonica hybrid rice will benefit the sink capacity and a synergistic increase in both yield and economic benefit.This study offers crucial theoretical insights and practical significance for increasing indica-japonica hybrid rice yield and ensuring food security. 展开更多
关键词 Source-sink relationship Physiological characteristics Economic benefit Yield level Yield components
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Sensitivity analysis of vibration characteristics and dynamic responses of a tracked vehicle 认领 引用 被引量：1
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作者 Xun Wang Xue Rui +3 位作者 Jinghong Wang Xiaoting Rui Guoping Wang Pingxin Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第3期323-348,共26页
This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation m... This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation method(DDM)with the linear multibody system transfer matrix method(linear MSTMM).The rigid-flexible coupled multibody system dynamics model of a tracked vehicle is established using the linear MSTMM and validated through the modal test.Building upon the existing DDM-based eigenvalue sensitivity analysis method within the linear MSTMM,the DDM is embedded into it to enable programmable and efficient computation of dynamic response sensitivities for mechanical systems.The proposed approach is used to quantitatively evaluate the sensitivities of both natural vibration characteristics(e.g.,natural frequencies and mode shapes)and transient dynamic responses of the tracked vehicle with respect to system parameters,successfully identifying critical structural parameters.Compared to conventional finite difference methods,the developed methodology eliminates sensitivity to perturbation step sizes.The contributions of this work lie in establishing a unified theoretical foundation and analysis framework for guiding dynamics optimization and design of mechanical systems,and extending the applicability of the linear MSTMM to sensitivity analysis of transient dynamic responses. 展开更多
关键词 Tracked vehicle Sensitivity analysis Vibration characteristics Dynamic responses Direct differentiation method Linear multibody system transfer matrix method
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Fracture characteristics and fracture interface buckling mechanism of cantilever rock mass under non-uniformly distributed load 认领 引用 被引量：1
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作者 Wenlong Shen Ziqiang Chen +7 位作者 Meng Wang Jianbiao Bai Zhengyuan Qin Tongqiang Xiao Ningkang Meng Juntao Liu Yan Gai Hua Nan 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期375-397,共23页
This study examined non-uniform loading in goaf cantilever rock masses via testing,modeling,and mechanical analysis to solve instantaneous fracture and section buckling from mining abutment pressure.The study investig... This study examined non-uniform loading in goaf cantilever rock masses via testing,modeling,and mechanical analysis to solve instantaneous fracture and section buckling from mining abutment pressure.The study investigates the non-uniform load gradient effect on fracture characteristics,including load characteristics,fracture location,fracture distribution,and section roughness.A digital model for fracture interface buckling analysis was developed,elucidating the influence of non-uniform load gradients on Fracture Interface Curvature(FIC),Buckling Rate of Change(BRC),and Buckling Domain Field(BDF).The findings reveal that nonlinear tensile stress concentration and abrupt tensile-compressive-shear strain mutations under non-uniform loading are fundamental mechanisms driving fracture path buckling in cantilever rock mass structures.The buckling process of rock mass under non-uniform load can be divided into two stages:low load gradient and high gradient load.In the stage of low gradient load,the buckling behavior is mainly reflected in the compression-shear fracture of the edge.In the stage of high gradient load,a buckling band along the loading direction is gradually formed in the rock mass.These buckling principles establish a theoretical basis for accurately characterizing bearing fractures,fracture interface instability,and vibration sources within overlying cantilever rock masses in goaf. 展开更多
关键词 Cantilever rock mass Non-uniformly distributed load Fracture characteristics Buckling fracture Digital model
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Stress wave propagation and energy characteristics of impact-damaged and water-soaked sandstone with different length-to-diameter ratios 认领 引用 被引量：1
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作者 Kang Peng Kun Luo +4 位作者 Yuanmin Wang Song Luo Tianxing Ma Jing Mao Jie Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1876-1891,共16页
In mining engineering,dynamic loads acting on the surrounding rock induce irreversible damage.The damage is further exacerbated by water exudation from filling bodies or groundwater in the surrounding rock.Understandi... In mining engineering,dynamic loads acting on the surrounding rock induce irreversible damage.The damage is further exacerbated by water exudation from filling bodies or groundwater in the surrounding rock.Understanding the propagation and energy characteristics of stress waves in damaged surrounding rock is essential for improving the stability of underground structures.Hence,in this study,an improved triaxial Split Hopkinson Pressure Bar(SHPB)testing system was used to prepare four sets of impact-damaged and water-soaked specimens with varying length-to-diameter ratios in the laboratory,followed by dynamic triaxial compression testing.Test results indicate that,following dynamic impact and water soaking,the propagation of stress waves in rock is altered.Compared with intact specimens,impact-damaged and water-soaked specimens(IDWS)show a reduction in both transmission and reflection coefficients,thereby enhancing their energy absorption capacity and decreasing transmitted and reflected energy.The length(length-to-diameter ratio)of the specimen and the peak of the incident wave also affect stress wave propagation.Under the same incident peak value,the transmission coefficient increases with larger length-to-diameter ratios,whereas the reflection coefficient decreases.Similarly,the energy carried by the stress wave is influenced by specimen length:as the length grows,the energy absorbed per unit volume declines.When using energy absorbed per unit volume to characterize the dynamic triaxial strength of rock,the length-to-diameter ratio effect on strength is not pronounced. 展开更多
关键词 Impact-damaged and water-soaked rocks Dynamic triaxial compression Stress wave propagation Split hopkinson pressure bar(SHPB) Energy characteristics Length-to-diameter ratio effect
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A method of characteristics for supersonic viscous flows 认领 引用 被引量：1
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作者 Bo ZHANG Yuxin ZHAO Shihe YI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期282-293,共12页
This paper develops a method of characteristics for supersonic viscous flows.The proposed method removes the inviscid and isentropic assumptions of the classical method of characteristics.The characteristic equations ... This paper develops a method of characteristics for supersonic viscous flows.The proposed method removes the inviscid and isentropic assumptions of the classical method of characteristics.The characteristic equations and compatibility equations are derived from the governing equations for compressible viscous flow.By combining the characteristic lines,the triangular interior unit process,quadrilateral interior unit process,and direct sonic point unit process are developed.The unit processes make up the characteristic net.The numerical algorithms consider the path of flow signal propagation.The inviscid terms are solved along characteristic lines,while the viscous terms are corrected through iterative whole-field computations.The proposed method has been applied to supersonic flat-plate boundary layer and verified by the similarity solution.The errors of velocity and temperature profiles are on the order of 0.1%,while the computation efficiency is the same as the classical method of characteristics.The accuracy and efficiency make the proposed method potential to become a basic tool of analysis and design for supersonic viscous flows. 展开更多
关键词 Characteristic line Compatibility equation Compressible flow Method of characteristics Supersonic flow Viscous flow
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Evolution Characteristics and Driving Mechanism of‘Bottom-up’and‘Top-down’Endogenous Automobile Industry Clusters:A Comparative Study in Taizhou and Wuhu,China 认领 引用 被引量：1
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作者 JIANG Haining ZHANG Jun +1 位作者 CHEN Jiaqi JIN Xingxing 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第1期34-49,共16页
Bottom-up and top-down endogenous automobile clusters exhibit distinct evolutionary traits and driving mechanisms,yet their comparative analysis remains understudied.Therefore,using Taizhou automobile industry cluster... Bottom-up and top-down endogenous automobile clusters exhibit distinct evolutionary traits and driving mechanisms,yet their comparative analysis remains understudied.Therefore,using Taizhou automobile industry cluster(TAIC)and Wuhu automobile industry cluster(WAIC)as cases,using historical statistical data and field interview data from the 1980s to 2023,combined with qualitative research methods of thematic and diachronic analysis,and quantitative research methods of social network analysis,we compare both endogenous automobile clusters’evolutionary traits and driving mechanisms.The results confirm both clusters undergo multi-scale spatial reconfiguration,organizational complexification,and intelligent networking technological transformation,yet diverge fundamentally:TAIC evolves through market-driven progressive expansion,transitioning from single to dual-core structures via private enterprise networking,with innovation following market-integrated logic and institutional thickness built on demand-driven evolution.Conversely,WAIC follows planned expansion,maintaining state-led hierarchical single-core stability through policy-driven breakthrough innovation and supply-dominated institutional construction-though both ultimately require formal-informal system synergy.Their coevolution is driven by dynamic interactions of path dependence(weakening influence),learning-innovation(strengthening influence),and relationship selection(inverted U-shaped trajectory),with divergent development paths rooted in TAIC’s grassroots self-organization genes versus WAIC’s top-level design genes,amplified by core enterprises’strategic disparities.The research findings can not only provide decision-making support for China’s industrial upgrading,but also contribute China’s insights to global economic governance. 展开更多
关键词 endogenous automobile industrial clusters evolutionary characteristics driving mechanism Taizhou Wuhu China
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Experimental study on the frost jacking characteristics of bamboo joint conical piles in seasonally frozen regions 认领 引用 被引量：1
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作者 YaoHui Zhang HaiHong Yang +1 位作者 TieCheng Sun Jiao Zhang 《Research in Cold and Arid Regions》 CAS CSCD 2026年第1期11-21,共11页
The variation in pile types can to some extent reduce frost jacking displacement of pile foundations in seasonal frost regions,yet further research is needed on the anti-jacking-up performance of different pile types ... The variation in pile types can to some extent reduce frost jacking displacement of pile foundations in seasonal frost regions,yet further research is needed on the anti-jacking-up performance of different pile types under freeze-thaw cycles.This study conducted freeze-thaw cycle model tests under open-system conditions based on the proposed design concept of bamboo joint conical piles,analyzing variations in test fill temperature,moisture content,surface displacement,and pile-top displacement.The main findings are:(1)Pile type variation significantly affects pile foundation frost jacking,with bamboo joint conical piles demonstrating superior anti-jacking-up performance compared to straight piles and inferior performance to 9°conical piles.Moreover,the anti-jacking-up performance of bamboo joint conical piles follows a pattern of initial enhancement followed by attenuation with increasing cone angle,where a 7°cone angle provides optimal anti-jacking-up performance.(2)The moisture content of the soil fill increases with the number of freeze-thaw cycles in an open system environment,with the rate of increase decreasing over time,while the initial frozen core volume within the fill material tends to increase during the thawing phase.(3)The mechanisms underlying the frost heave and settlement of the fill surface and the frost jacking displacement at the pile top were clarified.The frost heave and settlement of the fill surface result from volume changes in the frozen soil due to the water-ice phase transition and the compaction effect on unfrozen soil.The thermal melting evolution of the frozen core in the fill material is the key factor determining the cumulative displacement at the pile top.(4)Differences in the thermophysical properties between the pile foundation and the fill material induce the migration of free water toward the vicinity of the pile,where the higher moisture content of the fill material is detrimental to the mitigation of frost jacking damage to the pile foundation.These findings provide a foundation for further elucidation of the frost jacking mechanism of bamboo joint conical piles in seasonally frozen regions under freeze-thaw cycles. 展开更多
关键词 Freeze-thaw cycles Bamboo joint conical piles Frost jacking characteristics Model test Open system
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Spatiotemporal Characteristics of Drought in Yili River Basin,Northwest China in 1980-2020 认领 引用 被引量：1
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作者 HUANG Mengzhen LU Ruijie +1 位作者 LI Peiru HAN Yutong 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第2期271-290,I0001-I0003,共20页
The Yili River Basin in Northwest China is a crucial ecological security barrier,yet it faces frequent droughts amid global climate change,posing significant threats to food security and ecological stability.However,t... The Yili River Basin in Northwest China is a crucial ecological security barrier,yet it faces frequent droughts amid global climate change,posing significant threats to food security and ecological stability.However,the spatiotemporal variations and driving mechanisms of drought in the basin remain unclear.Based on the monthly Standardized Precipitation Evapotranspiration Index(SPEI),this study employed the Run-Length theory to identify drought events in the basin during 1980-2020,applied statistical and time-series analyses to investigate the spatiotemporal variations,trends,periodicity,and persistence of drought,and explored the underlying drivers associated with meteorological factors and large-scale atmospheric circulation patterns.The results showed that droughts in the Yili River Basin are more severe in spring and summer.Droughts in the central and southwestern regions exhibit greater severity,with shorter durations and stronger intensity.Drought conditions have generally worsened(Sen’s slope=−0.146/10 yr),with notable intensification since 2005,especially in the northwestern region.Spring droughts(Sen’s slope=−0.213/10 yr)and summer droughts(Sen’s slope=−0.169/10 yr)have intensified at most stations,while autumn and winter droughts have eased.In the future,droughts are expected to alleviate overall,but summer droughts may continue to intensify.The Yili River Basin exhibits two primary drought periods of 9 yr and 21 yr,with primary periods in autumn(20 yr)and winter(20 yr)being longer than those in spring(10 yr)and summer(17 yr).Finally,droughts are impacted by both meteorological factors and large-scale atmospheric circulation patterns.Rising temperatures and uneven precipitation have intensified droughts.The SPEI exhibits a co-phase relationship with the North Atlantic Oscillation and an antiphase relationship with the East Central Tropical Pacific Sea Surface Temperature.Therefore,close monitoring and mitigation are necessary for spring and summer droughts,with a focus on the central and southwestern areas in autumn and winter. 展开更多
关键词 Standardized Precipitation Evapotranspiration Index(SPEI) drought characteristics meteorological factors atmospheric circulation Yili River Basin,China
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Research on the Active and Passive Motion Characteristics of Bioinspired Soft Actuators 认领 引用
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作者 Qi Shen Jinzhu Zhang +2 位作者 Xiaoyan Xiong Hongjie Du Shiyu Li 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第1期139-158,共20页
The soft actuator is characterized by high safety,flexibility,and adaptability.It is capable of both active and passive defor-mations.This paper presents a discrete degree of freedom(DOF)method for soft actuators to r... The soft actuator is characterized by high safety,flexibility,and adaptability.It is capable of both active and passive defor-mations.This paper presents a discrete degree of freedom(DOF)method for soft actuators to reveal DOF characteristics.The method draws on the superposition mechanism of the deformation characteristics of the sarcomere in the skeletal muscles of living organisms.Firstly,the multi-DOF deformation characteristics of the soft actuator are discretized into superimposed combinations of single-DOF micro-units.Then,the soft actuator was determined to contain deformation characteristics such as extension-contraction,bending,and twisting.Eighteen types of micro-units with basic deforma-tion characteristics were obtained depending on the axis and orientation.Further,the mapping relationship between the combination of micro-units and the motion characteristics of the soft actuator based on the GF set theory was established.Finally,an active-passive DOF co-structured soft actuator(APCSA)was developed.The graphical approach analyzes the experimental results,and it can be concluded that active and passive DOFs can coexist in the composite deformation of the soft actuator. 展开更多
关键词 Soft actuator Active and passive DOF characteristics Active and passive motion characteristics Micro-units GFSet
Crushing characteristics of granite during ultra-high speed penetration:experiments and simulations 认领 引用
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作者 Yizhe Liu Quanyu Jiang +6 位作者 Zheng Hu Zishang Liu Jiayi Zheng Yi Liu Yanpeng Wei Kun Zhang Bingchen Wei 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期672-683,共12页
Escaping ejecta enhanced momentum transfer due to recoil produced by the impact,depending on the complex interaction of the projectile remove with to target.The crushing behavior of the target in the initial stage of ... Escaping ejecta enhanced momentum transfer due to recoil produced by the impact,depending on the complex interaction of the projectile remove with to target.The crushing behavior of the target in the initial stage of impact is often neglected,especially in meteorite-like brittle materials.Whereas,the relationship between crack evolution and stress wave propagation is vague under ultra-high speed impact.The experiments of Al sphere impacting into granite were carried out at velocities between 1800 and 4000 m/s by a two-stage light-gas gun(DBR30),revealing distinct fragmentation characteristics on granite.As the speed increases,transitions from intact to fractured,then fragmented,exhibiting distinct failure modes under shock wave loading.Smoothed particle hydrodynamics-finite element method(SPH-FEM)simulation was employed to describe the geometrical evolution of the projectile and the propagation crack in the target.It was found that the shape of the projectile gradually changes from a cone to spherical as speeds increase.Further crack fractal dimension analysis revealed that the penetration mode transition occurs within 1500-2000 m/s.This method provides a novel framework to evaluate the ultrahigh speed penetration while quantifying the penetration mode and crushing effect. 展开更多
关键词 Ultra-high speed Coupled SPH-FEM Crushing characteristics Penetration Fractal dimension
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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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Flow characteristics and deformation mechanism of Al-Mg-Si alloy under coupled conditions of cryogenic temperature and high strain rate 认领 引用
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作者 Fei DONG Xiao-qiang PENG +3 位作者 Tao LAI Chao-liang GUAN Hao HU Yi-fan DAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1428-1443,共16页
The flow characteristics and deformation mechanism of Al-Mg-Si alloy were studied at various temperatures(77-298 K)and strain rates(900−7000 s-1)using the Hopkinson pressure bar method,electron backscattered diffra... The flow characteristics and deformation mechanism of Al-Mg-Si alloy were studied at various temperatures(77-298 K)and strain rates(900−7000 s-1)using the Hopkinson pressure bar method,electron backscattered diffraction(EBSD),and transmission electron microscopy(TEM).The results showed that increasing the strain rate and decreasing the deformation temperature significantly enhanced the work hardening ability of Al-Mg-Si alloy,thereby markedly improving the plasticity.A dislocation density-based constitutive model for the Al-Mg-Si alloy was established,incorporating dislocation accumulation and dynamic recovery mechanisms,which accurately described the flow behaviors under different conditions.Microstructural observation revealed that the combination of cryogenic temperature and high strain rate significantly suppressed dislocation cross-slip,which led to the formation of numerous slip bands.As strain accumulated,these slip bands interacted and facilitated recrystallization,thereby obviously accelerating the grain refinement process. 展开更多
关键词 flow characteristics deformation mechanism Al-Mg-Si alloy cryogenic temperature high strain rate grain refinement
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Geochemical characteristics and sources of natural gas in the Upper Paleozoic limestone strata,Ordos Basin 认领 引用
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作者 Wen Zhang Qian-Ping Wang +9 位作者 Wen-Hui Liu Ping-Ping Shi Hou-Yong Luo Peng Liu Xiao-Yan Chen Qian Zhang Xiao-Feng Wang Dong-Dong Zhang Yi-Ran Wang Fu-Qi Li 《Petroleum Science》 SCIE EI CAS CSCD 2026年第2期582-595,共14页
The discovery of high-yield industrial gas flows in the limestone layer of the Permian Taiyuan Formation in the Ordos Basin highlights promising pro spects for natural gas exploration and has positioned this region as... The discovery of high-yield industrial gas flows in the limestone layer of the Permian Taiyuan Formation in the Ordos Basin highlights promising pro spects for natural gas exploration and has positioned this region as a key explo ration area.Howeve r,research on the origin and distribution of natural gas in the Taiyuan Limestone Formation,especially its hydrocarbon generation potential and whether these organically enriched limestones can serve as effective source rocks,remains limited.In this study,we aimed to analyse the composition and carbon isotopes of the Upper Palaeozoic Taiyuan Limestone Formation natural gas,including propanespecific isotopes.The isotopic data were compared with coal-type gases from the corresponding strata and oil-type gases from the Lower Palaeozoic carbonate strata.Natural gas in the Upper Palaeozoic Taiyuan Limestone Formation was markedly distinct from the'self-generated and self-accumulated'oil-type gas in the Lower Palaeozoic subsalt strata,indicating no obvious correlation between the two gases.The results did not support the notion that large-scale natural gas accumulations in the Lower Palaeozoic carbonate formations could be originated from Upper Palaeozoic limestone source rocks.The natural gas in the Upper Palaeozoic Taiyuan Limestone Formation was highly consistent with the typical coal-type gas from the Upper Paleozoic.The geochemical characteristics of the natural gas in the region were consistent with that of conventional natural gas,the position-specific isotopic composition of propaneΔC-T values had a narrow,positive.This showed that the gas in the Taiyuan Limestone Formation was derived from typeⅢkero gen,and propane mainly generated through the n-C3H7free radical pathway.Geochemical analyses of the Taiyuan Limestone source rocks,such as the determination of total organic carbon,kerogen carbon isotopes,organic macerals.Combined with the geochemical analysis of natural gas,it revealed low abundance of organic matter but good kerogen types,predominantly typeⅡ-Ⅲ,at a late to high-maturity evolution stage.Although the formation had certain hydrocarbon generation potential,it falls short of the hydrocarbon generation capacity of the Carboniferous-Permian coal measure source rocks.At present,there is no large-scale hydrocarbon generatio n,and it is not enough to provide hydrocarbon for the Lower Paleozoic. 展开更多
关键词 Taiyuan Formation Natural gas Position-specific carbon isotope Geochemical characteristics Ordos Basin
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Influence of crack characteristics on rainfall infiltration patterns and stability of clay slope 认领 引用
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作者 TAO Gaoliang HONG Haitao +3 位作者 HUANG Shaoping CHEN Qingsheng NIMBALKAR Sanjay FENG Shiju 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2910-2926,共17页
The clay slope containing cracks is subject to coupled influences of rainfall infiltration and crack development,which readily trigger landslides and other geohazards,posing serious threats to life and property.To inv... The clay slope containing cracks is subject to coupled influences of rainfall infiltration and crack development,which readily trigger landslides and other geohazards,posing serious threats to life and property.To investigate the effects of varying crack characteristics on the behavior of clay slope,this study combines laboratory unsaturated soil tests,hydraulic property measurements,physical model experiments,and numerical simulations to examine how crack location,crack depth,and crack inclination angle influence rainfall infiltration patterns and slope stability under simulated precipitation.The results show that crack location exerts a more pronounced control on changes in rainfall infiltration than either crack depth or inclination angle,whereas changes in crack depth have a stronger effect on slope stability than other crack properties.When the crack is situated mid-slope,the cumulative rainfall infiltration is maximized,and when it is located at the slope toe,the Factor of Safety(FOS)reaches its minimum.Variations in crack angles produce no significant change in additional infiltration,and the reduction in FOS remains below 1%.Deeper crack generally led to greater rainfall infiltration,with an approximate trend of a 10%increase in infiltration volume per meter of crack depth.The FOS decreased gradually with increasing depth,and beyond a critical depth the decline became more pronounced.However,beyond a critical crack depth,the decline in FOS accelerates sharply and the potential slip surface extends from the crest to the base of the crack.These findings elucidate the mechanistic influence of distinct crack parameters on infiltration behavior and stability of clay slopes under rainfall,providing theoretical guidance for the design of protective measures in crack clay slope engineering. 展开更多
关键词 Crack characteristics Rainfall infiltration Slope stability Clay slope Modeling tests Numerical simulation
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Direct numerical simulations of high-pressure impinging-jet atomization:Interfacial evolutions and spray characteristics 认领 引用
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作者 Bo WANG Erjun WU +4 位作者 Anlong YANG Feng ZHANG Baoe YANG Qingquan LIU Xiaodong CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期158-174,共17页
This study presents a numerical investigation of impinging-jet atomization across various Weber numbers(We) under high backpressure conditions.Using the volume-of-fluid method,adaptive mesh refinement,and the iso Adve... This study presents a numerical investigation of impinging-jet atomization across various Weber numbers(We) under high backpressure conditions.Using the volume-of-fluid method,adaptive mesh refinement,and the iso Advector interface reconstruction technique,atomization characteristics are simulated and analyzed for different values of We.The results indicate that the geometry induces turbulent jets,which drive turbulent atomization through the shear interactions at the gas–liquid interface.The key observed phenomena include the interaction of impact waves with liquid sheet perforation and the breakup of web of ligaments,both of which are prominent under high backpressure conditions.A novel method,based on the threshold velocity of spray droplet groups,is employed to quantitatively measure the spreading angle,showing that the angle increases with We in both front and side views.Additionally,the Sauter mean diameter of droplets follows power-law scaling with exponents of-1/3 in the upstream region and-1/2 in the downstream region,while the droplet size distribution conforms to a log-normal profile.This research provides valuable insights into interface evolution and droplet characteristics during impingingjet atomization under high backpressure,offering essential guidance for optimizing industrial atomization processes. 展开更多
关键词 Direct numerical simulations High-pressure Impinging-jet atomization Interfacial evolutions Spray characteristics
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Experimental and kinetic study on pyrolysis and combustion characteristics of sugar tar waste liquid(STWL):Effects of water contents and O2concentrations 认领 引用
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作者 Junwei Luo Long Yang +5 位作者 Zewu Zhang Feixiang Li Xiaojian Zha Qiaoyun Jiang Cong Luo Liqi Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第2期59-70,共12页
In this study,the pyrolysis and combustion characteristics of sugar tar waste liquid(STWL)affected by different water contents and oxygen concentrations are studied by using a Thermogravimetric analysis,and the kineti... In this study,the pyrolysis and combustion characteristics of sugar tar waste liquid(STWL)affected by different water contents and oxygen concentrations are studied by using a Thermogravimetric analysis,and the kinetic parameters of the pyrolysis and combustion are obtained by the Coats-Redfern integral method.The results show that both the pyrolysis process and the combustion process of the STWLs are divided into two stages under the different water contents and oxygen concentrations.The low and high temperature ranges for pyrolysis and combustion process are below 420℃ and 420-500℃ and below 400℃ and 400500℃,respectively.As the water contents increase,the pyrolysis initial temperature Ti,p gradually decreases and the comprehensive pyrolysis characteristic index D also decreases for the pyrolysis process.The Ti,p increases from 224℃to 350℃,and the index D decreases from 3.30×10-4to 0.811×10-4% 3·min-2·℃-3.The combustion ignition temperature Ti,c increases and the comprehensive combustion characteristic index S decreases.When the oxygen concentration increases,the ignition temperature and the burnout temperature remain almost constant,with variations of 3.6%and 2.0%,respectively.Besides,the pyrolysis and combustion process of the STWL obeys the stochastic nucleation and subsequent growth model,i.e.,[-ln(1-α)]4.These results are expected to provide some valuable guidance for organic waste liquid incineration treatment. 展开更多
关键词 Organic waste liquid Incineration treatment Combustion characteristics Water and O2 content Kinetic analysis
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