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3D morphological characteristics of shrinkage porosities and their relationship with microstructures in Mg−12Al magnesium alloy 认领 引用
1
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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A method of characteristics for supersonic viscous flows 认领 引用
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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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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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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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Thoughts on Agricultural Practice of the Party's Governance Strategy for Xinjiang in the New Era:Based on Advantageous and Characteristic Industry and Brand Mark-related Intellectual Property 认领 引用 被引量：2
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作者 Zhiguo SUN Dongbing XING +2 位作者 Meng LIU Yulan BAI Jinjin WANG 《Asian Agricultural Research》 2026年第5期1-14,共14页
This paper examines Xinjiang's advantageous and characteristic agriculture from grain production functional zones,important agricultural product protection zones,characteristic agricultural product advantageous zo... This paper examines Xinjiang's advantageous and characteristic agriculture from grain production functional zones,important agricultural product protection zones,characteristic agricultural product advantageous zones,hometowns of specialty products,One Village One Product,regional public brands,famous,special,premium,and novel agricultural products,characteristic agricultural products,agricultural product quality and safety,Taste of Xinjiang,Good Grain and Oil,and industrial clusters.Besides,from geographical indications,design patents(for packaging and containers),and trademarks,this paper studies the autonomous region's brand mark-related agricultural intellectual property.It also analyzes the main problems in the development of its brand agriculture,and puts forward suggestions such as building a diversified food supply system,improving the protection of geographical indication intellectual property rights,promoting the creation of design patents for packaging and containers,strengthening the registration of regional public trademarks and Madrid international trademarks,and carrying out targeted counterpart assistance to Xinjiang for characteristic agriculture. 展开更多
关键词 Advantageous and characteristic agriculture Agricultural intellectual property Targeted counterpart assistance to Xinjiang the Party's Governance Strategy for Xinjiang
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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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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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Acousto-optic characteristics of dry and wet damaged rock under cyclic impact loads 认领 引用
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作者 Huasu Wang Jing Bi +3 位作者 Yu Zhao Chaolin Wang Zairong Yang Wei Tang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期472-493,共22页
Extensive engineering experience and research findings suggest that rock mass instability is typically attributed to human engineering activities and natural disturbances,resulting in general dynamic mechanical proper... Extensive engineering experience and research findings suggest that rock mass instability is typically attributed to human engineering activities and natural disturbances,resulting in general dynamic mechanical properties.This is attributed to external interference resulting from the extensive use of the mechanical and blasting techniques necessary for mineral extraction.Quantifying the impact of dynamic disturbances on rock deformation behavior is essential for comprehending the long-term response of surrounding rock during excavation.This study placed the rock to sustained pressure and investigated the impact of varying hammer heights and dry and wet(W-D)damage on its shear failure behavior.This study investigated the fatigue disturbance studies on W-D damaged sandstone samples via W-D equipment,a disturbance creep device,digital image correlation(DIC),and acoustic emission(AE)technology.The experimental findings suggest that acoustic emission sensors can be utilized to quantify the internal damage of rock samples during cyclic impact,whereas DIC technology(optical measurement)is capable of capturing the surface crack propagation of samples.Under repeated impact and the combined action of W-D conditions,the bearing capacity of sandstone decreases,whereas the deformation capacity increases.Furthermore,the W-D cycles and impact strength are inversely related to the fatigue life.The intensity of W-D damage and disturbances further accelerates the development and propagation of cracks under cyclic disturbances.The research results are of preventive significance to ensure the safety and sustainable development of engineering construction. 展开更多
关键词 Dry and wet(W-D)cycle Crack characteristic Acoustic emission(AE)characteristic Fractal theory Dynamic damage
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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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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
Mechanical behavior,failure characteristics and energy evolution of layered rock subjected to uniaxial loading 认领 引用
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作者 SHUANG Haiqing LI Lei +3 位作者 XIN Jie ZHOU Bin LIN Haifei MENG Weitao 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2891-2909,共19页
The stability of overlying rock strata is jointly controlled by the advancement rate of coal mining face and rock properties.However,the crossscale mechanical behavior and energy evolution mechanism of two-layered roc... The stability of overlying rock strata is jointly controlled by the advancement rate of coal mining face and rock properties.However,the crossscale mechanical behavior and energy evolution mechanism of two-layered rock under different loading rates remain unclear,and the mesoscopic fracture characteristics and crack evolution law of three-layered rock are yet to be fully elucidated.To address these gaps,uniaxial compression tests were conducted on three types of two-layered rock(siltstone-fine sandstone,siltstone-sandy mudstone,fine sandstone-sandy mudstone) under five loading rates(0.05,0.08,0.10,0.15,0.20 mm/min).Acoustic emission and digital image correlation were coupled with the energy conservation principle to systematically investigate the mechanical properties,failure modes and energy conversion characteristics of the two-layered rock.Furthermore,based on the calibrated meso-parameters of two-layered rock,particle flow code numerical simulations were performed to explore the meso-mechanical properties,crack evolution and failure modes of three-layered rock(siltstone,fine sandstone,sandy mudstone) under typical loading rates(0.05 and 0.20 mm/min).The results showed that the mechanical evolution of twolayered rock could be divided into four typical stages,with synchronized responses from AE and DIC,i.e.,compaction stage(Stage Ⅰ-characterized by loading contact and pore closure),linear elastic stage(Stage Ⅱ-marked by discrete microcrack initiation and elastic energy storage),yield stage(Stage Ⅲ-dominated by extensive crack initiation,propagation,coalescence,partial rock spalling,and dissipative energy release),and residual stage(Stage Ⅳ-governed by post-failure joint surface friction).Specifically,the siltstone-fine sandstone exhibited a particular dual-peak phenomenon.Regarding energy evolution,elastic deformation dominated before reaching peak strength,manifesting as elastic strain energy storage.Post-peak,the rock component with lower compressive strength rapidly degraded,transferring energy to the adjacent component and inducing crack propagation,coalescence,and instability.The micro-crack evolution exhibited four stages,i.e.,initialization,slow propagation,rapid propagation,and stabilization,corresponding to the mechanical behavior of the threelayered rock.Moreover,sandy mudstone was used as an intermediate layer(FSM/MSF),the number of cracks increased by 40%-75%.This study provides a theoretical basis for the stability control of overlying rock strata in mining engineering. 展开更多
关键词 Layered rock Mechanical behavior Crack characteristic Energy evolution Discrete element method
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Remediation of characteristic contaminants in groundwater of chemical industrial by the activation of PMS:Recent developments and challenges-a mini-review 认领 引用
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作者 Yingnan Duan Jinyu Liu +3 位作者 Qian Liu Tianhao Li Hexiang Zhao Zhurui Shen 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第1期177-185,共9页
Groundwater is a key part of the terrestrial ecosystem,but it is vulnerable to pollution in the context of chemical industry development.Treating contaminated groundwater is challenging due to its stable water quality... Groundwater is a key part of the terrestrial ecosystem,but it is vulnerable to pollution in the context of chemical industry development.Treating contaminated groundwater is challenging due to its stable water quality,hidden contamination,and complex treatment requirements.Current research focuses on advanced treatment technologies,among which the advanced oxidation process(AOPs) of peroxomonosulfate(PMS) has great potential.Although there are many reviews of PMS-based AOP,most of them focus on surface water.This review aims to explore the activation reaction of PMS to groundwater by in-situ chemical oxidation(ISCO) technology,further study the reaction mechanism,compare the treatment effect of characteristic pollutants in the groundwater of the chemical industry park,propose new activation methods and catalyst selection,and provide guidance for future groundwater treatment research. 展开更多
关键词 Advanced oxidation processes(AOPs) In-situ chemical oxidation PMS Groundwater contamination Characteristic pollutants
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Characteristic variation and growth mechanism of inclusions in 316L stainless steel during solidification 认领 引用
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作者 Cheng-Song Liu Long-Feng Xu +5 位作者 Jing Zeng Xiu-Guo Ran Yong Wang Hua Zhang Jie Li Hong-Wei Ni 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期355-369,共15页
To fulfill diverse performance requirements in various industrial fields,it is essential to precisely control the inclusion characteristics in 316L stainless steel(316L SS),including chemical composition,size,and quan... To fulfill diverse performance requirements in various industrial fields,it is essential to precisely control the inclusion characteristics in 316L stainless steel(316L SS),including chemical composition,size,and quantity and so on,thus ensuring the steel with high cleanliness and quality.Solidification experiments with different cooling methods were conducted using an Al2O3-CaO-SiO2-MgO refining slag system to investigate the influence of cooling methods upon the characteristic variation and growth behavior of inclusions in 316L SS during the solidification process.Thermodynamic mechanisms underlying the inclusion composition transition during the solidification process were revealed,and a kinetic model for the prediction of the solute element segregation and the inclusion growth in the steel was developed and verified.Results indicated that a nonlinear fitting curve equation for the correlation between the average size of inclusions d and the cooling rate Rc was obtained,which was:d=3.728·Rc-0.134.As the cooling rate went down,Al2O3 content in the inclusions correspondingly decreased from 69.43 to 30.54 mass%,while the SiO2 content increased from 14.75 to 43.8 mass%.The final inclusion size,calculated by the kinetic inclusion growth model,increased from 2.37 to 9.65μm as the cooling rate was reduced from 56.7 to 0.7 K s−1,which were in fair agreement with experimental results. 展开更多
关键词 316L stainless steel Inclusion characteristic Inclusion growth Cooling method Kinetic model
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Estimation of characteristic stresses in granite through acoustic emission monitoring of microcrack fracture mode evolution 认领 引用
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作者 Yunge Zhao Linqi Huang +1 位作者 Longjun Dong Xibing Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期687-707,共21页
Characteristic stresses are critical indicators for microcrack initiation and propagation in rock,a process intrinsically linked to fracture mode.To investigate fracture mode evolution and its feasibility for estimati... Characteristic stresses are critical indicators for microcrack initiation and propagation in rock,a process intrinsically linked to fracture mode.To investigate fracture mode evolution and its feasibility for estimating characteristic stresses,this study conducted uniaxial compression and cyclic loading-unloading tests on fine-and coarse-grained granite with acoustic emission(AE) monitoring.Cyclic target stresses were set within intervals determined by characteristic stresses.Analysis using the AE parameters AFRA revealed that fracture mode evolution correlates with damage level,and shear microcrack propagation primarily governs macroscopic failure.A characteristic stress estimation method was developed by mapping key points on the shear crack proportion curve: crack closure stress(transition between fluctuating and stable segments),crack initiation stress(inflection point of curve rise),and crack damage stress(slope change point in ascending segment).Comparative analysis with the crack volumetric strain method validated the proposed method.The influences of fracture mode dividing line and statistical interval were discussed,with practical recommendations provided.Compared to conventional AE parameters,the fracture mode proportion exhibits lower sensitivity to AE parameter variations,enabling more reliable identification of characteristic stress points.Furthermore,it directly reflects microcrack evolution behavior,enhancing interpretability and providing a novel perspective for AE-based characteristic stress determination. 展开更多
关键词 Fracture mode Shear microcrack Characteristic stress Stress threshold Acoustic emission
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Study on the pullout bearing characteristics of bio-inspired root piles in coral sand foundation under different root buried depths 认领 引用
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作者 Xiangwei Fang Yaoyi Zhang +4 位作者 Zhiqiang Wang Peixi Xiong Fenghui Hu Ganggang Zhou Chunyan Wang 《Biogeotechnics》 2026年第2期75-84,共10页
Bio-inspired root pile(abbreviated as root pile)is a new type of bio-inspired foundation,which has a broad application prospect in the development and construction of China's South China Sea area due to its good b... Bio-inspired root pile(abbreviated as root pile)is a new type of bio-inspired foundation,which has a broad application prospect in the development and construction of China's South China Sea area due to its good bearing characteristics such as pullout bearing capacity.The effect of root buried depth on the uplift bearing characteristics of root piles is analyzed through the model test of uplift bearing of root piles with different root buried depths in coral sand foundation.The results show that increasing the root buried depth can improve the ability of the root pile to control the uplift displacement,and there exists an optimal buried depth or range of buried depths that can effectively improve the pile foundation's uplift bearing capacity and control the ultimate displacement.The attenuation of axial force at the root is in the form of a step;with the increase of root buried depth,the maximum value of lateral friction resistance develops from the lower part of the pile body without root to the upper part of the pile body without root.The range of the bearing ratio of the root section of the pile with root buried depth of 260 mm,340mm and 420mm is 12.33%–15.68%,9.98%–17.82%and 7.61%–21.65%,respectively;the smaller the root buried depth is,the higher is the ratio of the bearing ratio of the root section at the beginning of loading,and the bigger the root buried depth is,the bigger is the ratio of the root's final bearing ratio.The change of soil pressure around the pile increases and then decreases,and the densest point of soil compacting moves upward with the increase of root buried depth.The research results provide scientific basis for the design of root pile buried depth and root arrangement in actual projects. 展开更多
关键词 Bio-inspired root piles (Root pile) Coral sand Pullout resistance Root buried depth Bearing characteristic
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Settlement characteristics and prediction of typical loess-filled subgrade considering constraint conditions 认领 引用
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作者 Chenhui Guan Zhe Li +3 位作者 Xiaoyan Liu Lulu Liu Wen Li Guojun Cai 《Journal of Road Engineering》 EI CAS 2026年第2期266-286,共21页
Post-construction settlement of loess subgrade is a critical factor influencing road stability.This study,based on the Wubu–Suide section of China National Highway G307,investigates the settlement behavior of loess-f... Post-construction settlement of loess subgrade is a critical factor influencing road stability.This study,based on the Wubu–Suide section of China National Highway G307,investigates the settlement behavior of loess-filled subgrades under various constraint conditions.Field tests conducted at typical sections provide data on the deformation of different subgrades.Focusing on lateral deformation of soil units,the study explores the mechanism behind differential settlement in filled subgrades.A predictive model for loess-filled subgrade settlement,incorporating constraint conditions,is also proposed.The results indicate that constraint conditions exert significant control over settlement distribution.Under one-,two-,and three-sided constraints,the subgrades'normalized differential settlements are 1.03,0.56,and 0.18,respectively,confirming that multi-sided constraints progressively reduce differential settlement while enhancing uniformity in filled subgrades,thus facilitate settlement control.For subgrades with different constraints,the further away from the constraints,the greater the settlement.When constraints are symmetrically distributed,maximum settlement occurs at the constraint center.Based on the exponential model with a fitting correlation coefficient value of the settlement-time curve reaching 0.99,a settlement prediction model consisting of three stages:initial,deceleration,and stability was established,and the parameter determination was described in detail.As constraint dimensionality increases,the core parameter A1/A2 of the model is 0.755,1.06,and 1.54,respectively,which is positively correlated with the number of constraints.The prediction model,based on the testing data,aligns well with actual engineering observations and can be applied to practical projects,particularly for predicting subgrade settlement following continuous filling. 展开更多
关键词 Loess subgrade Settlement characteristic Settlement prediction Constraint condition Differential settlement
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