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A novel Angle-Constrained Optimization method of Conformal Lattice Structures 认领 引用 被引量：1
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作者 Jun Yan Weibin Xu +2 位作者 Fuhao Wang Sixu Huo Kun Yan 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第2期269-295,共27页
Conformal truss-like lattice structures face significant manufacturability challenges in additive manufac-turing due to overhang angle limitations.To address this problem,we propose a novel angle-constrained optimizat... Conformal truss-like lattice structures face significant manufacturability challenges in additive manufac-turing due to overhang angle limitations.To address this problem,we propose a novel angle-constrained optimization method grounded in the global adjustment of nodal coordinates.First,a build direction is selected to minimize the number of violating struts.Then,an angular-constraint matrix is assembled from strut direction vectors,and analytical sensitivities with respect to nodal coordinates are derived to enable efficient constrained optimization under nonlinear angular inequality constraints.Numerical studies on two complex curved-surface lattices demonstrate that all overhang violations are eliminated while only minor changes are induced in global stiffness and strength.In particular,the maximum displacement of an ergonomic insole varies by only 2.87%after optimization.The results confirm the method’s versatility and engineering robustness,providing a practical approach for additive manufacturing-oriented lattice structure design. 展开更多
关键词 Conformal lattice structures additive manufacturing structural optimization complex structures
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Inverse design framework of hybrid honeycomb structure with high impact resistance based on active learning 认领 引用 被引量：2
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作者 Xingyu Shen Ke Yan +5 位作者 Difeng Zhu Hao Wu Shijun Luo Shaobo Qi Mengqi Yuan Xinming Qian 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期407-421,共15页
In this study,an inverse design framework was established to find lightweight honeycomb structures(HCSs)with high impact resistance.The hybrid HCS,composed of re-entrant(RE)and elliptical annular re-entrant(EARE)honey... In this study,an inverse design framework was established to find lightweight honeycomb structures(HCSs)with high impact resistance.The hybrid HCS,composed of re-entrant(RE)and elliptical annular re-entrant(EARE)honeycomb cells,was created by constructing arrangement matrices to achieve structural lightweight.The machine learning(ML)framework consisted of a neural network(NN)forward regression model for predicting impact resistance and a multi-objective optimization algorithm for generating high-performance designs.The surrogate of the local design space was initially realized by establishing the NN in the small sample dataset,and the active learning strategy was used to continuously extended the local optimal design until the model converged in the global space.The results indicated that the active learning strategy significantly improved the inference capability of the NN model in unknown design domains.By guiding the iteration direction of the optimization algorithm,lightweight designs with high impact resistance were identified.The energy absorption capacity of the optimal design reached 94.98%of the EARE honeycomb,while the initial peak stress and mass decreased by 28.85%and 19.91%,respectively.Furthermore,Shapley Additive Explanations(SHAP)for global explanation of the NN indicated a strong correlation between the arrangement mode of HCS and its impact resistance.By reducing the stiffness of the cells at the top boundary of the structure,the initial impact damage sustained by the structure can be significantly improved.Overall,this study proposed a general lightweight design method for array structures under impact loads,which is beneficial for the widespread application of honeycomb-based protective structures. 展开更多
关键词 Re-entrant honeycomb Hybrid structures Inverse design Impact resistance Lightweight
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Response of wind turbine loads to multi-scale turbulent structures:a study based on turbulence signals observed in the field 认领 引用 被引量：2
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作者 Yongfen Chai Yan Wang +2 位作者 Haolin Li Jingjing Zhang Jian Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期593-609,共17页
Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in Chi... Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in China,the aerodynamic load responses of the wind turbine to different turbulence scales are quantitatively analyzed in this study.The results indicate that very large-scale motions(VLSMs)are associated with significant load fluctuations due to its low frequency and high energy characteristics,increasing the risk of extreme loads.Large-scale motions coupled with the natural frequency of wind turbines in the medium frequency range,result in resonance phenomena.Small-scale motions,due to their high-frequency rapid vibration characteristics,cause instantaneous oscillations in wind turbine loads.Furthermore,correlation analysis indicates that the flapwise moment and thrust are most sensitive to VLSMs,while the edgewise moment is less affected by the scale characteristics.It is worth noting that this study is the first to explore the modulation effects of different scales of turbulent structures on the amplitude of wind turbine load fluctuation.It was found that turbulent structures exceeding a scale of 3δ have the most significant impact on modulating the load amplitudes,where δ is the boundary layer thickness,which is 99% of the flow velocity outside the boundary layer.These findings contribute to the enhancement of understanding regarding the load response of wind turbines in multi-scale turbulent environments and provide important references for the optimization of wind turbine design and load control. 展开更多
关键词 Multi-scale turbulent structures Wind turbine load response Field observation experiment Wavelet analyze
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Genetic structure and admixture of the Yi and Qiang in southwestern China 认领 引用 被引量：1
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作者 Jun LIU Li JIANG +6 位作者 Yongqiang KONG Chunnian WANG Shuo FENG Xuanzhu CHEN Deqin ZHANG Chuanchao WANG Caixia LI 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS CSCD 2026年第4期402-415,共14页
The Tibetan-Yi Corridor in southwestern China is well-known for the origins,migration,and evolution of Sino-Tibetan populations.Previous genetic studies have primarily focused on Han and Tibetan populations,thereby le... The Tibetan-Yi Corridor in southwestern China is well-known for the origins,migration,and evolution of Sino-Tibetan populations.Previous genetic studies have primarily focused on Han and Tibetan populations,thereby leaving the significant genetic diversity within the Tibeto-Burman groups under-researched.In this study,to explore the genetic structure and admixture history of Tibeto-Burman populations in southwestern China,we sequenced the human genomes of 100 individuals from the Qiang and Yi ethnic groups in Sichuan Province.These populations were found to have the closest genetic affinity with nearby Tibeto-Burman-speaking Tujia and Tibetan populations.The Qiang share more allele sites with northern Altaic-speaking populations,while the Yi have closer genetic relationships with southern Hmong-Mien populations.The dominant ancestry of the Yi and Qiang derived from Neolithic millet agriculturalists in the Yellow River Basin,with a smaller proportion from Neolithic coastal populations in southern China,supporting the hypothesis of a northern origin of Sino-Tibetan populations.The Yi have more southern genetic components than the Qiang,reflecting the differential genetic influences of southeastern coastal populations on these groups.In summary,this study elucidates the fine-scale genetic structure of Tibeto-Burman populations and their genetic relationships with other Chinese populations,laying the foundation for forensic genetic research in East Asian populations. 展开更多
关键词 Tibeto-Burman Genetic diversity Genetic structure Population genetic relationships
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Impact of wall oscillation on the drag and flow structure in an open channel at transitional Reynolds number 认领 引用 被引量：1
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作者 Bofu Wang Luyao Zhang +1 位作者 Jianghua Li Quan Zhou 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期187-198,共12页
This study investigates the effects of spanwise wall oscillations(SWOs)on open channel flow at Reτ=85 using direct numerical simulations.The oscillation amplitude is fixed at A+=12,and the period T+varies from ... This study investigates the effects of spanwise wall oscillations(SWOs)on open channel flow at Reτ=85 using direct numerical simulations.The oscillation amplitude is fixed at A+=12,and the period T+varies from 20 to 400.Results show that SWOs reduce drag,with the highest reduction of 31%at T+=70.The primary mechanisms include an elevated streamwise velocity profile,reduced Reynolds stress,and disruption of near-wall coherent structures.A novel vortex cluster structure emerges,weakening near-wall streaks and reducing skin friction drag.As T+increases,the spanwise tilt of near-wall streaks becomes more pronounced,and turbulence recovers,leading to drag values closer to the uncontrolled flow.Beyond T+=70,the modulation effect on turbulence fluctuations saturates.SWOs mainly regulate Reynolds shear stress by controlling Q4 events,with shorter periods suppressing large-scale structures and longer periods enhancing velocity fluctuations. 展开更多
关键词 Transitional Reynolds number Drag reduction Turbulent structures
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The interface engineering strategy assists the 3D core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres to achieve significant overall water splitting 认领 引用 被引量：3
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作者 Jun Yu Yangping Zhang +6 位作者 Nannan Zhang Jie Li Huiyu Sun Xinyu Gu Changqing Ye Tianpeng Liu Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期570-576,共7页
Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral ... Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres electrocatalyst was constructed on nickel foam(NF)via an interfacial engineering strategy.This 3D core-shell heterostructure maximizes the exposure of active sites,optimizes the charge transport pathway and accelerates gas release rates.The protective shell strategy of NiFe LDH provides favorable stability,which contributes to inhibiting the electrochemical corrosion of the electrocatalyst and mitigating the toxic effects of Cl- and other microorganisms during the seawater splitting process.Moreover,the introduction of NiFe LDH induces a change in the OER mechanism from an adsorption evolution mechanism(AEM)to a lattice oxygen mechanism(LOM),which improves the intrinsic activity of the catalyst.Consequently,Co3S4/CuS@NiFe LDH demonstrates exceptional performance in the oxygen evolution reaction(OER)(η100=251 mV)and in the hydrogen evolution reaction(HER)(η100=254 mV),alongside remarkable stability over 100 h.For OWS,it exhibits a voltage of 1.46 V at 10 mA/cm2 and maintain stability for 100 h.Impressively,Co3S4/CuS@NiFe LDH still possesses outstanding activity and stability in natural alkaline seawater.This work proposes interfacial engineering to construct bifunctional catalysts with core-shell heterostructures,providing instructive guidelines for the design of highly efficient electrocatalysts toward seawater electrolysis. 展开更多
关键词 Core-shell structure Layered double hydroxides Transition metal sulphides Bifunctional catalyst Overall water splitting Overall seawater splitting
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Optimal management for promoting growth of poplar plantations:insights from canopy structure and light environment 认领 引用 被引量：1
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作者 Xiaolong Zhao Peilin Xie +3 位作者 Yutian Xin Junfeng Fan Pan Wan Huijing Ma 《Journal of Forestry Research》 SCIE EI CAS CSCD 2026年第1期60-77,共18页
Tree plantations are globally significant,and therefore,growth-related challenges cannot be ignored.Canopy structure and light environment influence the growth of plantations,but the precise relationship remains uncle... Tree plantations are globally significant,and therefore,growth-related challenges cannot be ignored.Canopy structure and light environment influence the growth of plantations,but the precise relationship remains unclear.We selected seven-year-old poplar plantations of varying cultivars planted various densities and measured their growth,canopy structure,and light environment.The findings indicate that poplar plantations of different cultivars and at different planting densities showed variations in leaf area index(LAI),average leaf angle(ALA),crown length(CL),length ratio(CLR),roundness(CR)and surface area(CSA),which directly or indirectly affect growth,resulting in disparities in their growing conditions.Crown roundness directly impacted growth,while LAI,CLR and ALA influenced growth indirectly by affecting intercellular carbon dioxide concentration.LAI and CLR had a positive effect;ALA had a negative one.Crown length and surface area directly and indirectly influenced growth by affecting photo synthetically active radiation and net photo synthetic rate,with direct impacts being more pronounced.This research has clarified the regulatory role of canopy structure in plantations growth,providing valuable insights for developing more effective management strategies. 展开更多
关键词 Poplar growth Photosynthesis Hybrid clones Structural equation modelling Crown surface area
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Influence mechanism of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation of igneous metamorphic coal 认领 引用 被引量：1
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作者 Xu Shao Botao Qin +5 位作者 Quanlin Shi Ziwei Li Bao Qu Shibo Xu Junyu Wang Mingyue Weng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期553-572,共20页
In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study invest... In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study investigates the specific surface area,pore volume,structure complexity/connectivity,heterogeneity/local features of pore size distribution,and oxygen consumption dynamics of igneous metamorphic coal through N2/CO2 isothermal adsorption tests and low-temperature oxidation experiments,and elucidates the influence mechanisms of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation.With increasing metamorphic degree,igneous metamorphic coal exhibits a more pronounced reduction in specific surface area during oxidation,while the increase in structure complexity due to coal-oxygen reactions is suppressed.Thermally metamorphic coal demonstrates accelerated oxygen consumption,with oxidation amplifying the difference in reaction rates compared to raw coal.Key mechanisms include oxidation-induced reduction in mesopore complexity and micropore volume,decreased dominance of small-pore-volume apertures,and increased heterogeneity,collectively leading to a lower half-oxygen-consuming temperature and steeper oxygen consumption curves.Simultaneously,increased pore volume/complexity and reduced uniformity/connectivity act synergistically to enhance oxygen consumption capacity,highlighting the coupling between pore structure evolution and oxidation behavior in igneous metamorphic coal.This study provides theoretical insights into the pore-oxygen coupling mechanisms governing coal spontaneous combustion in igneous intrusion areas. 展开更多
关键词 Igneous metamorphic coal Thermal metamorphism Low-temperature oxidation Pore structure Oxygen consumption dynamics
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Quantum computing-enhanced topology optimization with stress constraints for truss structures 认领 引用 被引量：2
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作者 Yan Wang Dixiong Yang +1 位作者 Zhenzeng Lei Guohai Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期41-57,共17页
Quantum computing,leveraging the properties of quantum physics such as quantum superposition and entanglement,possesses the potential for exponential acceleration compared to classical computing.It can significantly e... Quantum computing,leveraging the properties of quantum physics such as quantum superposition and entanglement,possesses the potential for exponential acceleration compared to classical computing.It can significantly enhance solution efficiency in topology optimization and effectively avoid the entrapment in local optima.This paper proposes a hybrid classical-quantum computing framework to solve the stress-constrained topology optimization problem for truss structures.Initially,structural analyses are performed on a classical computer to determine the stresses of truss members.Then,the optimization problem is formulated through incremental updates of member cross-sectional areas to make it compatible with a quantum annealer.The update strategy consists of a directional-control function and a magnitude-control function.By embedding stress constraints directly into the directional-control function,the original optimization problem is reformulated as a quadratic unconstrained binary optimization model suitable for quantum annealing.To realize a balance between solution accuracy and iteration efficiency,a dynamic strategy for adjusting the magnitude of area increments is proposed.Thus,the quantum annealer can effectively achieve the optimal solutions.When only the access time of the quantum processing unit is considered,the results from 2D and 3D examples of truss topology optimization validate the effectiveness of the proposed framework,and demonstrate the great potential of quantum computing in structural optimization. 展开更多
关键词 Topology optimization Truss structures Quantum computing Quantum annealing algorithm Quadratic unconstrained binary optimization problem
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Coupled Effects of Single-Vacancy Defect Positions on the Mechanical Properties and Electronic Structure of Aluminum Crystals 认领 引用 被引量：1
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作者 Binchang Ma Xinhai Yu Gang Huang 《Computers, Materials & Continua》 SCIE EI 2026年第1期332-352,共21页
Vacancy defects,as fundamental disruptions in metallic lattices,play an important role in shaping the mechanical and electronic properties of aluminum crystals.However,the influence of vacancy position under coupled t... Vacancy defects,as fundamental disruptions in metallic lattices,play an important role in shaping the mechanical and electronic properties of aluminum crystals.However,the influence of vacancy position under coupled thermomechanical fields remains insufficiently understood.In this study,transmission and scanning electron microscopy were employed to observe dislocation structures and grain boundary heterogeneities in processed aluminum alloys,suggesting stress concentrations and microstructural inhomogeneities associated with vacancy accumulation.To complement these observations,first-principles calculations and molecular dynamics simulations were conducted for seven single-vacancy configurations in face-centered cubic aluminum.The stress response,total energy,density of states(DOS),and differential charge density were examined under varying compressive strain(ε=0–0.1)and temperature(0–600 K).The results indicate that face-centered vacancies tend to reduce mechanical strength and perturb electronic states near the Fermi level,whereas corner and edge vacancies appear to have weaker effects.Elevated temperatures may partially restore electronic uniformity through thermal excitation.Overall,these findings suggest that vacancy position exerts a critical but position-dependent influence on coupled structure-property relationships,offering theoretical insights and preliminary experimental support for defect-engineered aluminum alloy design. 展开更多
关键词 Aluminum crystal vacancy defect microstructural characterization stress response electronic structure thermomechanical coupling
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Research progress on bio-inspired composite structures based on ceramic 3D printing:a review 认领 引用
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作者 Dekun Kong Hailong Wu +4 位作者 Qingquan Zhang Dechao Lyu Yumeng Han Zhihui Zhang Luquan Ren 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期430-468,共39页
Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibil... Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibility,but their inherent brittleness and processing defects urgently need to be broken through.Inspired by the biological structures found in nature,the integration of biomimicry and additive manufacturing(AM)technologies offers a new pathway for the innovative design of high-performance ceramic materials.This article systematically reviews the fundamental principles and classifications of ceramic AM technology,focusing on six typical elements of biomimetic structural design:coaxial composite structures,surface reinforcement structures,layered composite structures,porous structures,composite multicomponent structures,and intelligent bionic structures.The review delves into their biomimetic principles,preparation strategies,performance advantages,and research progress.Research indicates that through multiscale topological design and functional integration,these structures can significantly enhance the mechanical properties and environmental adaptability of ceramics.Nevertheless,current technologies still face numerous challenges in balancing manufacturing precision and efficiency,controlling cracks and residual stresses caused by interface defects,ensuring long-term material stability under extreme environments,enhancing intelligent response capabilities,and guaranteeing process scalability and performance consistency in clinical applications.Future research should integrate multidisciplinary approaches to optimize structural design and dynamic response,transforming biomimetic ceramic materials from‘biological replication'to‘performance exceeding',thereby providing theoretical and technical support for the customized development of high-performance ceramic devices. 展开更多
关键词 bio-inspired composite structures ceramic additive manufacturing coaxial composite structures composite multicomponent structures intelligent bionic structures
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A survey of panel aeroelasticity in shock-dominated flow:Perspectives from fluid-structure interactions and shock wave-boundary layer interactions 认领 引用 被引量：1
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作者 Aiming SHI Yiwen HE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期210-229,共20页
As a multidisciplinary phenomenon,panel aeroelasticity in shock-dominated flow is featured by two primary interactions:Fluid-Structure Interactions(FSIs)and Shock-Boundary Layer Interactions(SBLIs).The former raises s... As a multidisciplinary phenomenon,panel aeroelasticity in shock-dominated flow is featured by two primary interactions:Fluid-Structure Interactions(FSIs)and Shock-Boundary Layer Interactions(SBLIs).The former raises structural concerns,and the latter is of aerodynamic interest.Thus,panel aeroelasticity in shock-dominated flow represents a vital topic for the development and optimization of supersonic vehicles and propulsion systems.This review systematically summarizes recent advances in the methodologies applied to capture structural and fluid dynamics,including theoretical models,numerical simulations,and wind tunnel experiments.The application of data-driven modal decomposition,an advanced technique to extract physically crucial features,on the topic is introduced.From the perspective of FSIs,the distinctive aeroelastic behaviors in shock-dominated flow,including hysteresis phenomena and nonlinear responses,are highlighted.From the perspective of SBLIs,the modifications in their spatial and temporal characteristics imposed by the aeroelastic responses are emphasized.Motivated by the interaction between the shock waves and structural response,different strategies have been proposed to implement aeroelastic suppression and shock control,which have the potential to enhance structural safety and aerodynamic performance in the next generation of high-speed flight vehicles. 展开更多
关键词 Aeroelasticity Fluid structure interaction Modal decomposition Shock boundary layer interactions Shock waves
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Acoustic Absorption Properties of Bio-inspired Stochastic Voronoi Porous Structures 认领 引用
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作者 Wenjiong Chen Hanbin Wang +1 位作者 Zhiqi Li Shutian Liu 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1736-1750,共15页
Voronoi structures are widely present in nature,and highly ordered Voronoi structures such as honeycomb structures have gained extensive recognition and in-depth research in the field of sound absorption structure des... Voronoi structures are widely present in nature,and highly ordered Voronoi structures such as honeycomb structures have gained extensive recognition and in-depth research in the field of sound absorption structure design.However,Voronoi structures in biological tissues are not all highly ordered.Stochastic Voronoi structures are equally prevalent and exhibit excellent multifunctional properties.To further explore the acoustic value of stochastic Voronoi structures,this study proposes a Voronoi sound absorbing porous structure that features both structural stochasticity and performance robustness.First,a theoretical calculation model is established based on microperforated panel theory and Helmholtz resonance theory,enabling the rapid calculation of the structure’s sound absorption coefficient.Then,a systematic analysis is conducted on the effective conditions for absorption performance robustness from four dimensions:unit number,structural randomness,manufacturing errors,and boundary cutting.Results indicate that there exists a unit number threshold associated with absorption bandwidth in the Voronoi structure.When this threshold is exceeded,the structure can exhibit favorable sound absorption robustness against structural stochasticity,manufacturing errors,and boundary cutting.Experimental verification shows that under significant boundary changes,the structure still maintains an average sound absorption coefficient of approximately 0.8 within an absorption bandwidth of approximately 400 Hz.Its favorable low-frequency broadband sound absorption performance and robustness endow it with promising application prospects in engineering fields where cost control,environmental adaptability,and construction efficiency need to be balanced. 展开更多
关键词 Sound absorption structure Voronoi Structural stochasticity Performance robustness Porous structure
Low-frequency signal inversion and reconstruction via the spatial structure regularization 认领 引用
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作者 Wei-wei Gu Hao Li +2 位作者 Dong-feng Zhao Peng-fei Wang Guo-fa Li 《Applied Geophysics》 SCIE CSCD 2026年第1期125-137,429,共13页
Low-frequency signals play a crucial role in seismic inversion of thin-layer structure and reservoir prediction.However,during seismic exploration,the low-frequency signals are often contaminated,distorted,or even mis... Low-frequency signals play a crucial role in seismic inversion of thin-layer structure and reservoir prediction.However,during seismic exploration,the low-frequency signals are often contaminated,distorted,or even missing due to acquisition limitations,processing artifacts,and ambient noise.Although compressive sensing theory-based sparse inversion can partially recover low-frequency signals,the reconstruction results suffer from significant non-uniqueness.To address this challenge,we propose a sparse inversion approach incorporating spatial structural regularization to enhance low-frequency signal recovery.Due to the interference among seismic waveforms,spatial reflection structure exhibits frequency dependency.Consequently,the spatial structure estimated directly from seismic data differs significantly from the actual low-frequency spatial structure.Therefore,the proposed method estimates spatial reflection structure from seismic data in the neighboring frequency band of the low-frequency signals to be recovered,aiming to reduce the impact of frequency dependency on estimation accuracy.Subsequently,both the sparse structure of reflection coefcients and spatial structure of low-frequency signals are incorporated as regularization terms into the inversion framework,enabling geologically guided recovery of low-frequency components.The proposed method was successfully applied in the Tarim Oileld,eectively restoring low-frequency signals and providing reliable foundational seismic data for reservoir prediction. 展开更多
关键词 Spatial structure Structure tensor Low-frequency signals Sparse inversion
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Multi-objective topology optimization for cutout design in deployable composite thin-walled structures 认领 引用
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作者 Hao JIN Ning AN +3 位作者 Qilong JIA Chun SHAO Xiaofei MA Jinxiong ZHOU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期674-694,共21页
Deployable Composite Thin-Walled Structures(DCTWS)are widely used in space applications due to their ability to compactly fold and self-deploy in orbit,enabled by cutouts.Cutout design is crucial for balancing structu... Deployable Composite Thin-Walled Structures(DCTWS)are widely used in space applications due to their ability to compactly fold and self-deploy in orbit,enabled by cutouts.Cutout design is crucial for balancing structural rigidity and flexibility,ensuring material integrity during large deformations,and providing adequate load-bearing capacity and stability once deployed.Most research has focused on optimizing cutout size and shape,while topology optimization offers a broader design space.However,the anisotropic properties of woven composite laminates,complex failure criteria,and multi-performance optimization needs have limited the exploration of topology optimization in this field.This work derives the sensitivities of bending stiffness,critical buckling load,and the failure index of woven composite materials with respect to element density,and formulates both single-objective and multi-objective topology optimization models using a linear weighted aggregation approach.The developed method was integrated with the commercial finite element software ABAQUS via a Python script,allowing efficient application to cutout design in various DCTWS configurations to maximize bending stiffness and critical buckling load under material failure constraints.Optimization of a classical tubular hinge resulted in improvements of 107.7%in bending stiffness and 420.5%in critical buckling load compared to level-set topology optimization results reported in the literature,validating the effectiveness of the approach.To facilitate future research and encourage the broader adoption of topology optimization techniques in DCTWS design,the source code for this work is made publicly available via a Git Hub link:http://gffzz188fe103f8f1460as60qnocq50vw965qf.ffgz.tsg.suse.edu.cn/jinhao-ok1/Topo-for-DCTWS.git. 展开更多
关键词 Composite laminates Deployable structures Multi-objective optimization Thin-walled structures Topology optimization
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Periosteal mitochondria DNA structures drive agingassociated poor skeletal repair 认领 引用 被引量：1
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作者 Yanlin Wu Chuyi Han +9 位作者 Xue Yang Yitian Wang Weidong Tian Quan Yuan Hui Wang Haisheng Wang Bei Yin Ling Ye Feifei Li Fanyuan Yu 《Bone Research》 SCIE CAS CSCD 2026年第3期819-831,共13页
Insufficient skeletal repair is the primary threat of health span and lifespan in elders with increasingly vast global burden;yet,to date,the knowledge of resolving this crisis remains limited.In this study,we address... Insufficient skeletal repair is the primary threat of health span and lifespan in elders with increasingly vast global burden;yet,to date,the knowledge of resolving this crisis remains limited.In this study,we addressed the specific mechanisms underlying agingassociated poor bone repair,which are driven by the mitochondrial DNA structures mitochondrial G-quadruplex(mtG4).We found that mtG4 is spatiotemporal-wisely accumulated within Pdgfra+periosteal mesenchymal stromal/stem cells(PPM)both in healthy and premature aging,which substantially increases cellular senescence and the degenerative alterations of PPM.By utilizing transgenic lineage tracking,PPM organoids formation,mitochondrial transgenic mutation,organoids transplantation,and serial cellular molecular investigations,we reveal that mtG4 in PPM restricts vital mitochondrial genes’transcription to cause mitochondrial dysfunction,which utterly leads to severe mitophagy and cell senescence.These senescent PPM demonstrates impaired stemness and disrupted fate determination,finally phenocopying aging-associated poor bone repair.This study decodes the mitochondrial genomic reasons for insufficient bone repair during aging,which offers insights for developing cell-type-and disease-specific senolytic therapies in the future. 展开更多
关键词 bone repair mitochondrial G quadruplex mitochondrial DNA periosteal mesenchymal stem cells mitochondrial dysfunction insufficient skeletal repair mitochondrial dna structures cellular senescence
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Energy absorption behavior of mild steel tube-core sandwich structures for rockfall protection 认领 引用
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作者 HUANG Fuyou ZHANG Luqing +3 位作者 ZHOU Jian HAN Zhenhua WANG Song SUN Qihao 《Journal of Mountain Science》 SCIE CSCD 2026年第1期171-187,共17页
Sandwich structures are widely favored for their lightweight,high strength and superior impact mitigation capabilities in blast mitigation and transportation safety applications.Their application in large-scale,high-e... Sandwich structures are widely favored for their lightweight,high strength and superior impact mitigation capabilities in blast mitigation and transportation safety applications.Their application in large-scale,high-energy rockfall protection remains limited due to their relatively low volumetric energy absorption efficiency and the complex fabrication processes of key energy-absorbing components.To address these limitations,this study proposes a novel sandwich structure incorporating mild steel tubes as core energy absorbers to efficiently mitigate highenergy rockfall impacts.A finite element model was developed in LS-DYNA to systematically investigate the deformation and energy absorption behaviors.Comprehensive parametric analyses were conducted to quantify the effects of key design variables,including tube wall thickness,tube spacing(number of tubes),and infill materials.The results demonstrate that increasing tube wall thickness significantly enhances ultimate energy absorption,with 12-mm-thick tubes absorbing 2.2 times more energy than 6-mm-thick tubes.Lateral constraints induced by adjacent tubes improve specific energy absorption per unit displacement by approximately 30%-45%.Furthermore,incorporating infill materials considerably enhances energy absorption,with aluminum foam infills achieving an 81%increase compared to empty tubes.Nevertheless,higher energy absorption capacity typically leads to greater peak impact forces,increasing the number of tubes offers a better balance between energy absorption and impact force,optimizing the structural performance.These findings provide valuable theoretical insights and practical guidelines for designing sandwich structures in civil and infrastructure engineering applications for effective rockfall protection. 展开更多
关键词 Sandwich structure Mild steel tube Rockfall impact Energy absorption Structural optimization
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Structural stability and magnetic properties of disordered SmCo7-xMx(M=metal)modulated by valence electron structure 认领 引用
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作者 Wei Liu Yongquan Guo +3 位作者 Boyang Li Yu Yao Haitao Kong Yichen Feng 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期517-523,共7页
SmCo7-xMx(M=Cu,Zr,Hf,Si,Ga)intermetallic compounds,with distinctive disordered crystal structure and excellent magnetic performance,are of great importance for application as high-temperature rare-earth permanen... SmCo7-xMx(M=Cu,Zr,Hf,Si,Ga)intermetallic compounds,with distinctive disordered crystal structure and excellent magnetic performance,are of great importance for application as high-temperature rare-earth permanent magnets.In this study,the relationship between the valence electronic structure,structural stability and magnetic and thermal properties of Sm(Co,M)7intermetallic compounds is revealed by using an empirical electron theory of solids and molecules.The structural stability is strongly related to the valence electronic structure that is modulated by doping the third element M into SmCo7.The calculated bond lengths,magnetic moments and Curie temperatures show good agreement with experimental ones.The magnetic moment and Curie temperature strongly depend on the number of 3d magnetic electrons,and can be modulated by mutual electron transformation between 3d magnetic electron and covalence electron. 展开更多
关键词 Sm(Co,M)7 pseudo-binary intermetallics valence electron structure structural stability magnetic property
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Destruction of the North China Craton:Evidence from the electrical structure and fluid content 认领 引用 被引量：1
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作者 Bao-chun Li Gao-feng Ye +4 位作者 Shao-huai Sun Le-tian Zhang Sheng Jin Wen-bo Wei Hao Dong 《China Geology》 CAS CSCD 2026年第2期243-256,I0001-I0007,共14页
The three-dimensional resistivity model of the lithosphere and fluid content plays a significant role in analyzing the spatiotemporal distribution and dynamic reasons for the North China Craton(NCC)destruction.The con... The three-dimensional resistivity model of the lithosphere and fluid content plays a significant role in analyzing the spatiotemporal distribution and dynamic reasons for the North China Craton(NCC)destruction.The conductivity is related to temperature and melt fraction using laboratory experiments.The Hashin-Shtrikman(HS)bounds are used to constrain the conductivity range of rocks in the solid and solid-melt systems.The authors established the lithospheric conductivity-temperature relationship by combining the mineral composition obtained from the analysis of xenoliths,the steady-state heat conduction equation,water,and carbon dioxide.To discuss the destruction of the NCC,the three-dimensional resistivity structure model obtained from the magnetotelluric sounding(MT)array inversion of the NCC is compared with the model calculated using the HS bounds.The research results show that the higher the volatile water and carbon dioxide content in the fluid,the lower the mantle solidus.Based on the melt fractions of the Ordos Block,Trans-North China Orogen,and Bohai Bay Basin,the speculated lithosphere-asthenosphere boundary(LAB)exhibits the characteristics of deep in the west and shallow in the east.The partial melting of the Bohai Bay Basin began at a shallower depth than other places,with a more significant difference in fluid content in the depth. 展开更多
关键词 Craton rifting Upper mantle electrical structure Temperature Mantle fluid Water amd carbon dioxide Melt fraction Volatile Xenolith North China Craton Geological survey engineering
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Synthesis,crystal structures,and antitumor activity of two metal complexes of imidazolyl acylhydrazones 认领 引用
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作者 ZONG Zhihui ZHAO Zijie +5 位作者 HUANG Lei PAN Zhicheng WANG Shan LIANG Lili LIU Huaqing ZHANG Enli 《无机化学学报》 SCIE CAS CSCD 北大核心 2026年第5期1048-1062,共15页
Two complexes[Cd(L)(CH3O)(CH3COO)]·CH3OH·(CH3)2NH(C1)and[Mn(L)Cl2(CH3OH)](C2)were synthesized by reacting a new imidazole-bearing ligand 4-(1H-imidazol-1-yl)-N'-(pyridin-2-ylmethylen... Two complexes[Cd(L)(CH3O)(CH3COO)]·CH3OH·(CH3)2NH(C1)and[Mn(L)Cl2(CH3OH)](C2)were synthesized by reacting a new imidazole-bearing ligand 4-(1H-imidazol-1-yl)-N'-(pyridin-2-ylmethylene)benzohydrazide(L)with cadmium and manganese salts,respectively.The ligand was characterized by 1H NMR and 13C NMR spectroscopy,while the complexes were analyzed by single-crystal X-ray diffraction,powder X-ray diffraction,thermogravimetric analyses,and UV-Vis spectroscopy.Complex C1 features a 1D zigzag chain structure formed by alternating connections of one ligand and one metal ion.In contrast,complex C2 exhibits a mononuclear molecular structure,where each unit consists of one ligand connected to one manganese ion.Both complexes further form a 3D structure through π-π interactions and intermolecular hydrogen bonds.Cell proliferation assays conducted on four tumor cell lines and one normal cell line revealed that both C1 and C2 exhibited significantly stronger inhibition of tumor cell growth compared to the ligand L.Notably,C1 demonstrated superior anti-proliferative activity against A549 and A2780 cells relative to cisplatin,while showing comparable cytotoxicity toward SMMC-7721 cells.Further mechanistic studies indicated that C1 induces apoptosis in both SMMC-7721 and A549 tumor cells,suppresses the invasion and migration of SMMC-7721 cells,and arrests the cell cycle at the G0/G1 phase. 展开更多
关键词 crystal structure imidazole acylhydrazone antitumor apoptosis
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