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Cellular homeostatic boundaries:The planetary boundaries of the cell 认领 引用
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作者 Qing-Hua Wu Jun-Yao Li 《Life Research》 2026年第3期78-80,共3页
In the intricate tapestry of life,the cell stands as the fundamental unit,orchestrating its survival and functionality through a symphony of meticulously regulated biochemical processes.However,just as the Earth’s ec... In the intricate tapestry of life,the cell stands as the fundamental unit,orchestrating its survival and functionality through a symphony of meticulously regulated biochemical processes.However,just as the Earth’s ecosystem has a carrying capacity,cells also face their own“survival limits”in maintaining normal function.Although the concept has not yet been clearly articulated by researchers,the survival limit of a cell implies the threshold of extreme conditions or parameters that a cell can withstand in order to maintain normal function and survival.These conditions include,but are not limited to,extreme ranges of key parameters such as energy metabolism,redox balance,molecular crowding,and signaling.Breaching these limits may lead to cellular dysfunction,senescence or even death. 展开更多
关键词 cellular homeostatic boundaries signaling planetary boundaries cell survival limits biochemical processes molecular crowding redox balance survival limit
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Achieving serrated grain boundaries within gradient microstructures of nickel-based superalloys for dual-property turbine disks in aeroengines 认领 引用 被引量：1
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作者 Bingchao XIE Yongquan NING +4 位作者 Youwei LUO Zhaotian WANG Bowen SHI Mei ZHAN Mingwang FU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期641-660,共20页
Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural ... Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural evolution,underlying mechanisms,and the critical influencing factors.Dynamic recrystallization governed the microstructural evolution in the fine-grained and transition regions during GSD,where multiple nucleation mechanisms were active.Plastic deformation facilitated the dissolution ofγ'phase in fine-grained regions,ultimately resulting in its morphological transformation.During the subsequent SHT,serrated GBs formed within the gradient microstructures produced by prior GSD without disrupting the grain size gradient,thereby enhancing creep resistance.Two distinct mechanisms associated withγ'gbparticles governed the formation of the serrations at GBs.Owing to the stronger dragging effect of grain boundary junctions in fine-grained regions,the amplitude and wavelength of serrations in these regions were smaller than those in coarse-grained regions.Moreover,the formation of serrations exhibited a strong dependence on the inherent properties of the GBs.The random high-angle grain boundaries(HAGBs)with misorientation angles in the range of 30-59°tended to become serrated more easily during SHT due to their high mobility and the accelerated precipitation ofγ'gbparticles at them.Low-ΣHAGBs and low-angle GBs were not prone to form serrations.In particular,serration formation was completely inhibited atΣ3 twin boundaries due to their extremely low mobility and the absence ofγ'gbparticles. 展开更多
关键词 Gradient microstructures Grain boundary migration Grain boundary properties Serrated grain boundaries Serration formation mechanisms Superalloys
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Selective Lithium Deposition Through 3D Copper Collector With Lithiophilic Alloy“Skins”and Curvature Boundaries for Dendrite-Free Lithium-Metal Anodes 认领 引用
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作者 Meng-Qi Zhu Dong-Xu Ye +5 位作者 Xiao-Yi Teng Yi-Xin Wei Jin-Hao Zhu Xiao-Man Liao Jin-Yan Zhong Jin-Dan Zhang 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期792-800,共9页
Although lithium metal has been regarded as an ideal anode material for high-energy-density batteries,its practical applications remain hindered by many serious challenges.Three-dimensional(3D)porous Cu current collec... Although lithium metal has been regarded as an ideal anode material for high-energy-density batteries,its practical applications remain hindered by many serious challenges.Three-dimensional(3D)porous Cu current collectors demonstrate potential in ensuring uniform Li deposition.However,notable drawbacks of 3D Cu collectors—such as poor lithophilic properties,unordered interface microstructure,and insufficient surface area—still hamper their effectiveness.Herein,a 3D porous Cu skeleton with lithiophilic Cu0.64Zn0.36 alloy“skins”and curvature boundaries(CuZn@Cu)is developed.In CuZn@Cu,the Cu0.64Zn0.36 alloy layer endows the collector with good lithium affinity and low surface reaction activation energy,thereby promoting uniform lithium deposition.In addition,the abundant curvature boundaries in CuZn@Cu regulate the distributions of the electric field and lithium ion flux,guiding the selective nucleation and growth of lithium.Consequently,compact and dendrite-free lithium deposition is achieved on CuZn@Cu,and the CuZn@Cu collector enables a high average Coulombic efficiency of 98.15%in 1000 cycles.The lithium symmetric cells with the CuZn@Cu exhibit a long cycle life of more than 1400 h at1 m A cm-2. 展开更多
关键词 Cu collector curvature boundaries lithiophilic lithium anodes selective deposition
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Unlocking high-rate MXenes as lithium-ion battery anodes viaΣ7 coincidence site lattice grain boundaries 认领 引用
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作者 Yifan Wu Zhongyong Zhang +3 位作者 Shangquan Zhao Bin Huang Neng Li Naigen Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期31-37,I0003,共7页
Grain boundaries(GBs),particularlyΣ7 coincidence site lattice(CSL)defects experimentally observed in MXenes,significantly influence their performance as lithium-ion battery(LIB)anodes.This work systematically investi... Grain boundaries(GBs),particularlyΣ7 coincidence site lattice(CSL)defects experimentally observed in MXenes,significantly influence their performance as lithium-ion battery(LIB)anodes.This work systematically investigates the impact ofΣ7 GBs on MXene electrochemical properties,with a focus on rate capability.The results indicated thatΣ7 GB formation is thermodynamically favored in Ti2C,Nb2C,and Mo2C MXenes compared to other M2C compositions,with stability further enhanced by oxygen and sulfur surface functionalization.These GBs induce substantial geometric distortions that reduce surface charge localization while enhancing electrical conductivity in Ti2CO2.The altered electronic structure at GB sites weakens lithium adsorption strength without promoting lithium dendrite formation.Furthermore,diffusion kinetics calculations reveal significantly reduced lithium diffusion barriers atΣ7 GBs in Ti2C,Mo2C,and Mo2CS2compared to pristine materials.Mechanistic analysis attributes this enhancement to diminished charge localization at GB regions,which generates a“charge pool”effect—a zone of uniformly distributed free charge observed in Ti2C and Mo2C.This charge pool not only facilitates ultra-low lithium diffusion barriers(as low as 11 meV in M2C at 0.1 V vs.Li+/Li)but also enhances potential responsiveness of diffusion kinetics.Our findings establish the intentional introduction ofΣ7 GBs as an effective strategy for designing high-rate MXene anodes.This work provides fundamental insights into GB-enhanced electrochemical mechanisms in 2D materials,offering crucial theoretical guidance for the design of high-rate anode materials. 展开更多
关键词 MXenes Coincidence site lattice grain boundaries(CSL-GBs) High-rate anodes Charge pool effect Lithium-ion batteries
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Manipulation of Topological Boundaries within a Magnetic Domain Wall 认领 引用
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作者 Zhuyang Nie Ji Chen +6 位作者 Cunlong Dong Bin He Caihua Wan Haifeng Du Xiufeng Han Yizhou Liu Guoqiang Yu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期277-292,共16页
Bloch points and transverse walls can serve as topological boundaries within a magnetic domain wall.Here,we investigate the stability and dynamics of these topological boundaries for potential spintronic applications.... Bloch points and transverse walls can serve as topological boundaries within a magnetic domain wall.Here,we investigate the stability and dynamics of these topological boundaries for potential spintronic applications.Using micromagnetic simulations,we reveal the coexistence regimes of Bloch points and transverse walls in thin films with perpendicular magnetic anisotropy.An external in-plane field enables reversible transitions between these states through boundary-mediated Bloch point nucleation and annihilation processes.Under spin-transfer torque,transverse walls exhibit transverse drift and deformation.In contrast,Bloch points move strictly along the domain wall without transverse deflection and feature a Walker breakdown threshold an order of magnitude higher than conventional domain walls.Our findings establish a device concept where binary states correspond to in-plane magnetization orientations separated by mobile topological boundaries,offering new opportunities for spintronic architectures. 展开更多
关键词 bloch points transverse walls magnetic domain wallherewe topological boundaries micromagnetic simulationswe magnetic domain walls thin films stability dynamics
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Modeling Techno-Economic Boundaries for Undeveloped Reservoirs: Integrated Simulation-Regression Approach with Xinjiang Case Study 认领 引用
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作者 Man Zhang Cheng Chen +2 位作者 Hai-Xia Guo Yi-Ming Xiao Xin-Jian Zhao 《Energy Engineering》 EI 2026年第3期519-545,共27页
Traditional oilfields face increasing extraction challenges, primarily due to reservoir quality degradation and production decline, which are further exacerbated by volatile international crude oil prices—illustrated... Traditional oilfields face increasing extraction challenges, primarily due to reservoir quality degradation and production decline, which are further exacerbated by volatile international crude oil prices—illustrated by Brent Crude’s trajectory from pandemic-induced negative pricing to geopolitically driven surges exceeding USD 100 per barrel. This study addresses these complexities through an integrated methodological framework applied to medium-permeability sandstone reservoirs in the Xinjiang oilfield by combining advanced numerical simulations with multivariate regression analysis. The methodology employs Latin Hypercube Sampling (LHS) to stratify geological parameter distributions and constructs heterogeneous reservoir models using Petrel software, rigorously validated through historical production data matching. Production forecasting integrates numerical simulation and Decline Curve Analysis (DCA), while investment estimation utilizes Ordinary Least Squares (OLS) regression to correlate engineering parameters with drilling and completion costs. Economic evaluation incorporates Discounted Cash Flow (DCF) modeling and breakeven analysis, establishing techno-economic boundaries via oil price sensitivity analysis ranging from USD 40 to 90 per barrel. Visualization tools, including 3D heatmaps, delineate nonlinear interactions among engineering, geological, and investment datasets under economic constraints. Key findings demonstrate that for the target reservoirs, as oil prices increase from USD 40 to USD 90 per barrel, the minimum economic thickness threshold decreases from approximately 5.7 m to about 2.5 m, with model prediction errors consistently below 25% across validation datasets. This framework provides scientifically grounded decision support for optimizing capital allocation and offers actionable insights to enhance undeveloped hydrocarbon development planning amid market uncertainty. Ultimately, it supports national energy security through technically robust and economically viable resource exploitation strategies. 展开更多
关键词 Numerical simulation multiple regression technical-economic boundaries EUR prediction oil price sensitivity
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Urban growth boundaries for ecologically fragile cities:A simulationconstraint approach for sustainable land use planning in mountainous regions 认领 引用
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作者 ZHANG Rou YAO Xiaowei +1 位作者 ZHANG Hongwei WANG Ying 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1724-1740,共17页
Rapid urban expansion in mountainous cities exacerbates ecological fragility and intensifies tensions between development and environmental sustainability.Achieving a dynamic balance between ecological protection and ... Rapid urban expansion in mountainous cities exacerbates ecological fragility and intensifies tensions between development and environmental sustainability.Achieving a dynamic balance between ecological protection and urban growth boundaries(UGBs)is therefore essential.However,existing UGB delineation methods rarely account for the unique ecological indicators and spatial complexities of mountain regions,limiting their effectiveness in guiding sustainable land use planning.To address this gap,we propose a framework that integrates ecological constraints(ECs)into the PLUS model for UGB delineation in mountainous cities.Key ecological indicators are systematically evaluated and embedded as model constraints,while mathematical morphology techniques are applied to optimize UGB boundaries.Using Chongqing,a representative mountainous city in China,as a case study,we identified 1,641 km²of EC zones.Results indicate that soil and water conservation,water retention,and biodiversity maintenance are the primary ecosystem service functions in mountainous urban settings.Validation of the PLUS model demonstrated robust simulation performance(overall accuracy=0.86,Kappa=0.79,FoM=0.34).Elevation,residential areas,and water bodies were identified as the main drivers of urban expansion.The EC-based approach yielded 1,280 km²of UGBs—slightly less than the 1,305 km²projected under the natural growth scenario—effectively curbing encroachment into ecologically sensitive areas while accommodating urban growth and reducing landscape fragmentation.The proposed framework provides practical guidance for sustainable land use planning and offers transferable insights for UGB delineation in other ecologically fragile mountainous cities. 展开更多
关键词 Urban growth boundaries Ecological constraints PLUS model Chongqing central urban area
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Slip transfer,slip blocking and slip-to-twin transfer at grain boundaries in a WE43 Mg alloy 认领 引用
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作者 Yidi Li Biaobiao Yang +1 位作者 Yunping Li Javier LLorca 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第6期368-379,共12页
Slip transfer/blocking at grain boundaries was studied in a WE43 Mg alloy through a combined experimental approach involving electron backscatter diffraction(EBSD),slip trace modified lattice rotation analysis(ST-MLRA... Slip transfer/blocking at grain boundaries was studied in a WE43 Mg alloy through a combined experimental approach involving electron backscatter diffraction(EBSD),slip trace modified lattice rotation analysis(ST-MLRA),and diffraction contrast tomography(DCT).Slip(basal slip)transfer occurred exclusively across low-angle grain boundaries(<20°),while slip blocking was dominant(80.4%),and slip to twin transfer typically occurred at higher misorientation angles.Among the geometric descriptors analyzed,low values ofκ(angle between slip directions),ψ(angle between slip plane normals),andθ(angle between the traces of the incoming and outgoing slip planes with the GB plane)were consistently associated with the slip transfer cases.Notably,slip transfer events were tightly gathered in the high-compatibility region where both the Luster-Morris parameter(m)and the LRB factor exceeded 0.9,suggesting that both serve as robust criteria for basal slip transmission across grain boundaries.The integration of 3D grain morphology with actual slip system identification provides a comprehensive framework for evaluating intergranular deformation in Mg alloys. 展开更多
关键词 Slip transfer Magnesium Grain boundary Diffraction contrast tomography Geometric descriptor
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Tracing equatorward and poleward boundaries of the magnetospheric cusp from a simulated X-ray image 认领 引用
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作者 Xue Wang TianRan Sun +4 位作者 C.Philippe Escoubet Andy Read YiHong Guo Steve Sembay Chi Wang 《Earth and Planetary Physics》 EI CSCD 2026年第1期144-155,共12页
A large-scale view of the magnetospheric cusp is expected to be obtained by the Soft X-ray Imager(SXI)onboard the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE).However,it is challenging to trace the three-d... A large-scale view of the magnetospheric cusp is expected to be obtained by the Soft X-ray Imager(SXI)onboard the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE).However,it is challenging to trace the three-dimensional cusp boundary from a two-dimensional X-ray image because the detected X-ray signals will be integrated along the line of sight.In this work,a global magnetohydrodynamic code was used to simulate the X-ray images and photon count images,assuming an interplanetary magnetic field with a pure Bz component.The assumption of an elliptic cusp boundary at a given altitude was used to trace the equatorward and poleward boundaries of the cusp from a simulated X-ray image.The average discrepancy was less than 0.1 RE.To reduce the influence of instrument effects and cosmic X-ray backgrounds,image denoising was considered before applying the method above to SXI photon count images.The cusp boundaries were reasonably reconstructed from the noisy X-ray image. 展开更多
关键词 SMILE mission X-ray image cusp boundary
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Local-Stress-Induced Detwinning in Nanotwinned Al without Shear Stress on Twin Boundaries 认领 引用
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作者 Wenchao Shi Tao Wei +4 位作者 Chuan Yang Qichao Fan Hongxi Liu Bin Shao Peng Jing 《Computers, Materials & Continua》 SCIE EI 2026年第5期373-388,共16页
Enhancing the strength of nanotwinned aluminum(Al)is essential for the development of nextgeneration high-end chip technology.To better understand the detwinning behavior of nanotwinned Al under conditions with no res... Enhancing the strength of nanotwinned aluminum(Al)is essential for the development of nextgeneration high-end chip technology.To better understand the detwinning behavior of nanotwinned Al under conditions with no resolved shear stress acting on the twin boundaries,we conducted molecular dynamics simulations of uniaxial tensile deformation in nanotwinned single-crystal Al at room temperature.Detwinning is observed only when the twin boundary spacing is 7.01 A.At larger spacings,twin boundaries remain parallel to the loading direction,with no rotation or bending,indicating negligible migration.Detwinning is triggered by localized stress from dislocation interactions,with detwinning fraction evolving synchronously with dislocation density.In the absence of detwinning,dislocations inclined toward twin boundaries interact frequently with them,leading to a loss of coherency that intensifies with increasing twin boundary spacing.These findings enhance understanding of the plastic deformation mechanisms in nanotwinned metals at very small twin boundary spacings,supplement the conventional understanding of twin boundary stability,and therefore suggest potential pathways for designing Al-based nanostructures with enhanced stability or controllable plastic deformation. 展开更多
关键词 Detwinning local stress dislocation interactions twin boundary spacing nanotwinned Al molecular dynamics simulation
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Coupling of 0D/1D Grain Boundaries Inducing Extreme Charge Rearrangement/Magnetic Resonance for Ultrabroadband Electromagnetic Wave Absorption 认领 引用
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作者 Jie Huang Liuying Wang +7 位作者 Renbing Wu Weichao Wang Chaoqun Ge Haoke Yang Xu Tang Wenyu Jiao Gu Liu Bin Wang 《Carbon Energy》 SCIE EI CAS CSCD 2026年第3期201-212,共12页
Ferrite-carbon composites effectively absorb electromagnetic(EM)waves via coupled mechanisms.However,the dynamic evolution of intrinsic polarization and magnetic loss mechanisms following interfacial coupling has long... Ferrite-carbon composites effectively absorb electromagnetic(EM)waves via coupled mechanisms.However,the dynamic evolution of intrinsic polarization and magnetic loss mechanisms following interfacial coupling has long been overlooked,impeding broadening of the ultra-broadband EM wave absorption performance in heterostructures.Herein,via surface ligand modulation,in situ growth of 0D Fe3O4quantum dots(QDs)on the surface of 1D carbon nanotubes triggers grain boundary coupling.The energy rebalancing effect at the interface induces an extreme charge rearrangement within the Fe3O4QDs.This rearrangement enhances dipole orientation hysteresis and charge accumulation,resulting in charge and interfacial polarization losses.Meanwhile,for subcritical Fe3O4QDs,short-range magnetic resonance and magnetic exchange-triggered magnetic resonance transfer synergistically enhance the magnetic loss.Through charge rearrangement/magnetic resonance induced by0D/1D grain boundary coupling,an effective bandwidth of nearly 10 GHz is achieved at a minimal thickness of 2 mm,covering the X and Ku bands.This strategy provides an effective paradigm and novel theoretical insights for ultra-broadband electromagnetic wave absorption applications. 展开更多
关键词 charge rearrangement electromagnetic wave absorption ferrite–carbon matrix composites grain boundary coupling
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Precise design of triple phase boundaries and pores in cathode catalyst layers to accelerate oxygen transport for proton exchange membrane fuel cells 认领 引用
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作者 Huiyuan Li Shu Yuan +7 位作者 Yuan Ren Ye Wang Jiabin You Xiaojing Cheng Liuxuan Luo Xiaohui Yan Shuiyun Shen Junliang Zhang 《Materials Reports(Energy)》 EI 2026年第2期120-128,共9页
Triple phase boundary(TPB)and pore structure in the cathode catalyst layer(CCL)play vital roles in the uti-lization of Pt-based catalyst in proton exchange membrane fuel cells(PEMFCs).The excellent TPBs on the catalys... Triple phase boundary(TPB)and pore structure in the cathode catalyst layer(CCL)play vital roles in the uti-lization of Pt-based catalyst in proton exchange membrane fuel cells(PEMFCs).The excellent TPBs on the catalyst surface and pore structure should be able to increase oxygen transport channels while maintaining proton transport,and simultaneously facilitate the efficient removal of product water.Here,we design a precision-regulated structure for the Pt/ionomer interfacial and pores using a gas breakthrough method driven by high evolution pressure.The highly efficient oxygen transport channels are created through enhanced TPB accessibility and opened pore structure in CCLs,leading to an 11% improvement in PEMFC performance at an appropriate HER current density and bubble intensity conditions.The proposed strategy provides a direction to tune the Pt/ionomer interface and improve the catalytic activity of Pt in membrane electrode assembly(MEA). 展开更多
关键词 Precision-regulated structure Triple phase boundary Pore structure Oxygen transport resistance Cathode catalyst layer
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Can Digital Transformation Cross Organizational Boundaries?——An Exploration of the Supply Chain Conduction Mechanism 认领 引用
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作者 Sun Qian Wang Jinxiao +1 位作者 Liu Zeyan Li Jing 《China Oil & Gas》 CAS 2026年第1期47-52,共6页
In an era marked by unprecedented digital transformation across the glboe, industries are experiencing profound shifts in their operational paradigms and competitive dynamics. However, existing research has predominan... In an era marked by unprecedented digital transformation across the glboe, industries are experiencing profound shifts in their operational paradigms and competitive dynamics. However, existing research has predominantly focused on the internal impacts of corporate digital transformation, overlooking the external effects it generates, particularly the spillover effects within vertical supply chain relationships. This study provides an in-depth examination of how corporate digital transformation affects the governance efficiency of upstream and downstream supply chain partners and explores the underlying transmission mechanisms. The research reveals that corporate digital transformation has a dual impact on the governance efficiency of upstream and downstream supply chain partners. Furthermore, the study demonstrates that resource endowment conditions across different industries and regions significantly influence both the transmission mechanisms and outcomes of digital transformation. Finally, this study proposes corresponding managerial implications based on the theoretical analysis. 展开更多
关键词 digital transformation supply chain organizational boundaries governance efficiency
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The Fallen Monument:On Spatial Boundaries and Southern Cultural Reproduction in Faulkner's A Rose for Emily 认领 引用
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作者 YU Rui 《Journal of Literature and Art Studies》 2026年第5期366-373,共8页
William Faulkner's A Rose for Emily has long been interpreted as an allegory of the conflict between Southern tradition and modern civilization. This paper attempts to examine Emily Grierson from the dual perspect... William Faulkner's A Rose for Emily has long been interpreted as an allegory of the conflict between Southern tradition and modern civilization. This paper attempts to examine Emily Grierson from the dual perspectives of "spatial boundaries" and "cultural reproduction", exploring how she is constructed by the old Southern order as a "monument" and how she moves toward both cultural and physical death under the penetration of Northern modernity.The study finds that Emily's house is not merely a physically enclosed entity but constitutes a superimposition of three boundaries: physical, social, and bodily. Her poisoning of the Northern suitor, Homer Barron, is not simply a matter of personal love or hatred, but an extreme response triggered by the complete failure of the “cultural reproduction” mechanism when Southern aristocratic culture encounters Northern capitalist values. Through this interpretation, this paper seeks to reveal Faulkner's ambivalent attitude toward the fate of the South-mourning the passing of tradition while keenly perceiving its inherent decay and violence. 展开更多
关键词 spatial boundaries cultural reproduction Southern belle myth William Faulkner
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Effects of Crystal Orientations and Grain Boundaries on Nanoindentation Behavior of γ-TiAl Alloys 认领 引用
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作者 Niu Wenshuai Li Haiyan +5 位作者 Zeng Linghao Cao Hui Chen Wenke Han Chenyang Feng Ruicheng Chen Tao 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第4期899-913,共15页
To elucidate the deformation mechanisms ofγ-TiAl,the nanoindentation experiments and crystal plasticity finite element(CPFE)simulation were employed to investigate the effects of crystal orientations and GBs on the m... To elucidate the deformation mechanisms ofγ-TiAl,the nanoindentation experiments and crystal plasticity finite element(CPFE)simulation were employed to investigate the effects of crystal orientations and GBs on the mechanical properties ofγ-TiAl alloys.A crystal plasticity constitutive model was developed,and load-displacement curves,hardness,and Young's modulus were obtained for both single grains and GBs inγ-TiAl alloys.Based on the aforementioned model,this study investigated the distribution patterns of surface morphology around the indentation sites of individual grain and GBs.It also analyzed the cumulative shear strain distribution,slip system activation,and the interaction between GBs and dislocation slip for various crystal orientations.The results indicate that the mechanical response and pileup behavior exhibit significant anisotropy due to the interplay among the indenter geometry,material slip systems,and cumulative shear strain distribution.Moreover,the interaction between GBs and dislocation slip substantially alters dislocation distribution,thereby influencing material flow and playing a critical role in the mechanical response and plastic deformation of the material. 展开更多
关键词 grain boundary nanoindentation anisotropy crystal orientation CPFE
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Tetragonal-pseudocubic phase boundaries and octahedral order-disorder tilting transitions facilitate high piezoelectric performance in Bi1/2Na1/2TiO3-based single crystals 认领 引用
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作者 Jialin Niu Yongxing Wei +10 位作者 Yanghuan Deng Changpeng Guan Changqing Jin Leiyang Zhang Ruiyi Jing Zhong Yang Zengyun Jian Zhonghua Dai Zengzhe Xia Roman G.Burkovsky Li Jin 《Advanced Powder Materials》 EI CAS CSCD 2026年第1期29-38,共10页
High-performance lead-free piezoelectric single crystals are urgently needed for next-generation actuators and transducers.In this study,we reveal that a compositionally driven tetragonal-pseudocubic(T-PC)phase bounda... High-performance lead-free piezoelectric single crystals are urgently needed for next-generation actuators and transducers.In this study,we reveal that a compositionally driven tetragonal-pseudocubic(T-PC)phase boundary,in conjunction with an octahedral order-disorder tilting transition,significantly enhances the piezoelectric response in Nb5+-substitution(Bi0.48Na0.425K0.055Ba0.04)(Ti0.98Nb0.02)O3(BNKBT-2Nb)single crystals.The crystal achieves an outstanding piezoelectric coefficient of d33=662 pC/N at room temperature.In situ X-ray diffraction confirms an electric field-induced transition from the PC to T phase.Atomic-resolution HADDF-STEM analysis reveals an increase in the c/a ratio(c/a>1.01)on the local scale and ordered octahe-dral tilting of the a0a0c+type driven by the poling field.The single crystals exhibit excellent piezoelectric per-formance over a broad temperature range,achieving a peak d33 of 920 pC/N at approximately 92℃.Furthermore,the polar states exhibit a pronounced frequency dependence near the depolarization temperature.These findings provide critical insight into the structure-property relationship and offer a promising pathway for designing advanced lead-free piezoelectric crystals for functional electromechanical applications. 展开更多
关键词 Single crystals Lead-free Phase boundary Piezoelectricity Oxygen octahedra tilts
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The February 8,2025,Swan Islands(Caribbean Sea) Earthquake:Lessons for Geohazards on Transform Plate and Micro-Plate Boundaries 认领 引用
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作者 Timothy M.Kusky Paul Mann Jiannan Meng 《Journal of Earth Science》 SCIE CAS CSCD 2025年第2期852-855,共4页
On February 8,2025,a remote area in the Caribbean Sea was rocked by a large MW7.6(USGS,2025) earthquake,centered 209 km SSW of Georgetown,the capital of the Cayman Islands,and the largest city(population~41 000) of... On February 8,2025,a remote area in the Caribbean Sea was rocked by a large MW7.6(USGS,2025) earthquake,centered 209 km SSW of Georgetown,the capital of the Cayman Islands,and the largest city(population~41 000) of the British Overseas Territories(Figure 1).The earthquake was significant due to its large magnitude,potential regional impact,and the possibility of generating a tsunami. 展开更多
关键词 micro plate boundaries transform plate boundaries tsunami potential Caribbean Sea swan islands earthquake geohazards magnitude earthquake
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Quasi in-situ EBSD analysis of grain growth,grain rotation and special boundaries during annealing of extruded Mg−Zn−Gd alloy 认领 引用
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作者 Wasi ULLAH Muhammad ALI +4 位作者 Ling-yu ZHAO Hong YAN Bo-yu LIU Zhi-wei SHAN Rong-shi CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第8期2296-2309,共14页
Grain boundary(GB)characteristics in relation to texture development were investigated in an extruded Mg−Zn−Gd alloy subjected to isothermal annealing at 400°C for 5−155 min.Quasi in-situ electron backscatter dif... Grain boundary(GB)characteristics in relation to texture development were investigated in an extruded Mg−Zn−Gd alloy subjected to isothermal annealing at 400°C for 5−155 min.Quasi in-situ electron backscatter diffraction(EBSD)was employed to analyze grain growth(GG),grain rotation,and GB character evolution.GG was found to proceed via two distinct mechanisms:nucleation at triple junction followed by subsequent growth,and GB migration governed by the Burke–Turnbull mechanism.The rotation angle of(0001)basal pole ranged from 31°to 40°,contributing to the observed non-basal texture.Misfit strain(δ)associated with various coincidence site lattice(CSL)boundaries was evaluated,showing that the length fractions forΣ7,Σ13b andΣ45a boundaries decreased in the isothermal annealing due to their higherδvalues,while those forΣ9,Σ21a andΣ43b boundaries increased.Grain growth kinetics was evaluated after isothermal annealing and grain growth exponent was also determined.Collectively,these findings demonstrate that GB characteristics significantly influence texture evolution by promoting energetically favorable boundary configurations. 展开更多
关键词 Mg alloy annealing grain growth grain rotation coincident site lattice boundary
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Genesis of Successive Quasi-Linear Convective Systems over North China:Dynamical and Thermodynamic Forcing by a Cold Vortex,Complex Terrain,and Surface Boundaries 认领 引用
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作者 Yan ZHANG Rudi XIA +2 位作者 Jinfang YIN Jianhua SUN Linlin ZHENG 《Journal of Meteorological Research》 SCIE CSCD 2026年第4期1251-1269,共19页
Quasi-linear convective systems(QLCSs)frequently produce severe weather in North China,with multiple QLCSs often forming successively within a short period.However,their formation mechanisms under such conditions rema... Quasi-linear convective systems(QLCSs)frequently produce severe weather in North China,with multiple QLCSs often forming successively within a short period.However,their formation mechanisms under such conditions remain unclear.This study investigated the formation mechanisms of three successive QLCSs that affected Beijing and its vicinity from the afternoon to evening on 12 June 2022,using in-situ and remote sensing observations as well as high-resolution Weather Research and Forecasting model simulations with a 9-,3-,1-km nested grid.The event occurred within the trough of a mature cold vortex,which induced dry westerlies over the western mountainous areas and moist southerlies over the eastern plains of North China.Diurnal solar heating further intensified the zonal thermal and moisture contrasts between the eastern and western domains.Therefore,a southwest-northeast-oriented dryline with a dynamical confluence persisted along the eastern Taihang Mountains.To the west of the dryline,sustained boundary layer turbulent activities eliminated convective inhibition.Meanwhile,episodic weak cold advections induced by the cold vortex modestly increased the convective available potential energy over the northern mountains,providing energy for the generation of convective cell clusters(CCs).These sequentially initiated CCs propagated southeastward under the steering airflow,with distinct outflow boundaries forming at their leading edges.Crucially,the continuous merging between the southeastward-moving CC outflow boundaries and the quasi-stationary dryline strengthened the low-level convergence both in depth and intensity along segments of the dryline zone.The intensified dynamical lifting ultimately triggered convection along these segments,corresponding to the successive formation of three QLCSs.This paper highlights the synergistic effects of cold-vortex forcing,complex-terrain modulation,and dryline-outflow boundary interactions on the formation of organized convection over mountainous areas.The findings benefit the forecasting and early warning of similar severe convective events in North China. 展开更多
关键词 cold vortex dryline severe weather quasi-linear convective systems outflow boundary complex terrain North China
Segregation behaviors in{101-1}compressive twin boundaries of Mg-RE alloy under deformation at room temperature 认领 引用 被引量：1
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作者 Yujie Cui Lili Guo +6 位作者 Yunwei Gui Kenta Aoyagi Haotian Tong Qinqin Wei Fangzhou Liu Yuichiro Hayasaka Akihiko Chiba 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第1期330-337,共8页
Solute atoms and precipitates significantly influence the mechanical properties of Mg alloys.Previous studies have mainly focused on the segregation behaviors of Mg alloys after annealing.In this study,we investigated... Solute atoms and precipitates significantly influence the mechanical properties of Mg alloys.Previous studies have mainly focused on the segregation behaviors of Mg alloys after annealing.In this study,we investigated the segregation behaviors of an Mg-RE alloy under deformation.We found that the enrichment of solute atoms occurred in{101-1}compressive twin boundaries under compression at 298 K without any annealing in an Mg-RE alloy by scanning transmission electron microscopy and energy-dispersive X-ray analysis.The segregated solutes and precipitates impeded the twin growth,partially contributing to the formation of small-sized{101-1}compressive twins.This research indicates the twin boundaries can be strengthened by segregated solutes and precipitates formed under deformation at room temperature. 展开更多
关键词 Magnesium alloys Compression test Scanningransmission electron microscopy(STEM) Segregation Twin boundaries
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