The Mg-8Gd-3Er-0.5Ag-0.5Zr(wt.%)alloy fabricated by hot-extrusion+stamping exhibits an exceptional aging hardening response,with the yield strength being improved by>200 MPa.Traditional extrusion microstructure was...The Mg-8Gd-3Er-0.5Ag-0.5Zr(wt.%)alloy fabricated by hot-extrusion+stamping exhibits an exceptional aging hardening response,with the yield strength being improved by>200 MPa.Traditional extrusion microstructure was observed in the as-extruded sample,with the elongated non-recrystallized grains showing typical(10.10)fiber texture.After stamping,almost all non-recrystallized grains were twinned mainly following the(10.12)twin orientation.This significantly changed precipitate morphologies formed during the following aging,from the well-known granularβ'precipitate into net-workβ'+β'H structure,with the granularβ'precipitates being connected by chain-likeβ'H precipitates.Additionally,a novel fault was found in theβ'precipitates,whose formation is highly related to the metastable I2-type stacking fault.This new precipitation structure means the effective interparticle spacing being approximately zero,and the faults in theβ'precipitates can not only enhance strength of precipitates but also could efficiently impede dislocation motion,thus resulted in positive contribution on alloy’s yield strength.This work provides new insights in developing high-strength Mg alloys by modifying precipitation structure along with the inner faults in precipitation.展开更多
A bimodal structure in the WE43 alloy was constructed through traditional extrusion.The results suggest that the dominant dynamic recrystallization(DRX)mechanism in the alloy extruded at 300℃(E300)is twin-induced DRX...A bimodal structure in the WE43 alloy was constructed through traditional extrusion.The results suggest that the dominant dynamic recrystallization(DRX)mechanism in the alloy extruded at 300℃(E300)is twin-induced DRX(TDRX),while the discontinuous DRX(DDRX)prevails when extruded at 330℃(E330)and 370℃(E370).For all three kinds of alloys,a decrease in extrusion temperature results in enhanced strength without a significant loss of ductility.Notably,the E300 alloy demonstrates outstanding comprehensive mechanical properties,with a yield strength of 325 MPa,an ultimate tensile strength of 365 MPa,and an elongation of 10.2%.Numerous blocky Mg14Nd2Y with size of~100 nm is formed within elongated grains,which contributes to the increased strength of E300 alloy.Additionally,the high-density of I1 stacking faults and fine blocky precipitates within elongated grains enhance ductility.展开更多
Inspired by the recent discovery of metallic spin supersolidity and its giant magnetocaloric effect in the rareearth alloy EuCo2Al9,we perform a combined study through electronic structure analysis,effective spi...Inspired by the recent discovery of metallic spin supersolidity and its giant magnetocaloric effect in the rareearth alloy EuCo2Al9,we perform a combined study through electronic structure analysis,effective spin model construction,and Monte Carlo simulations on a stacked triangular lattice(STL),and reveal a novel mechanism for the emergence of 3D spin supersolid in a metallic antiferromagnet.From first-principles inputs,we derive a minimal spin model on a STL,which arises from the interplay between Ruderman-Kittel-Kasuya-Yosida and dipolar interactions and accurately reproduces the experimental thermodynamics.Based on the STL model,we identify a ground state that simultaneously breaks discrete lattice translational symmetry and continuous spinrotational symmetry--the hallmark of a spin supersolid.Furthermore,we present the field-temperature phase diagram of the 3D STL model and discuss the various magnetic phases and associated phase transitions.Under zero field,the spin supersolid Y order establishes in two steps:an upper transition at TN1,where an emergent U(1)symmetry appears and the system enters a fluctuating collinear regime,followed by a lower transition at TN2into the spin supersolid Y phase.In contrast,the supersolid V phase undergoes a single phase transition at T.Our results not only provide a comprehensive theoretical understanding of the metallic spin supersolid reported for EuCo2Al9but also pave the way for further experimental investigations into its supersolid transitions and universality class.展开更多
Intrusion detection in Internet of Things(IoT)environments presents challenges due to heterogeneous devices,diverse attack vectors,and highly imbalanced datasets.Existing research on the ToN-IoT dataset has largely em...Intrusion detection in Internet of Things(IoT)environments presents challenges due to heterogeneous devices,diverse attack vectors,and highly imbalanced datasets.Existing research on the ToN-IoT dataset has largely emphasized binary classification and single-model pipelines,which often showstrong performance but limited generalizability,probabilistic reliability,and operational interpretability.This study proposes a stacked ensemble deep learning framework that integrates random forest,extreme gradient boosting,and a deep neural network as base learners,with CatBoost as the meta-learner.On the ToN-IoT Linux process dataset,the model achieved near-perfect discrimination(macro area under the curve=0.998),robust calibration,and superior F1-scores compared with standalone classifiers.Interpretability was achieved through SHapley Additive exPlanations–based feature attribution,which highlights actionable drivers ofmalicious behavior,such as command-line patterns,process scheduling anomalies,and CPU usage spikes,and aligns these indicators with MITRE ATT&CK tactics and techniques.Complementary analyses,including cumulative lift and sensitivity-specificity trade-offs,revealed the framework’s suitability for deployment in security operations centers,where calibrated risk scores,transparent explanations,and resource-aware triage are essential.These contributions bridge methodological rigor in artificial intelligence/machine learning with operational priorities in cybersecurity,delivering a scalable and explainable intrusion detection system suitable for real-world deployment in IoT environments.展开更多
In physics,our expectations for system behavior are often guided by intuitive arithmetic.For systems composed of identical units,we anticipate synergy of the contributions from these units,where 1+1=2.Conversely,for s...In physics,our expectations for system behavior are often guided by intuitive arithmetic.For systems composed of identical units,we anticipate synergy of the contributions from these units,where 1+1=2.Conversely,for systems built from opposing units,we expect cancellation of their contributions,where 1-1=0.This intuitive arithmetic has long underpinned our understanding of physical properties of materials,from electronic transport to optical responses.However,scientific breakthroughs often occur when nature reveals ways to circumvent these seemingly fundamental rules,opening new possibilities that challenge our deepest assumptions about material behavior.展开更多
基金supported by the Scientific and Technological Developing Scheme of Jilin Province under grants No.YDZJ202301ZYTS538the National Natural Science Foundation of China under grants No.U23A20128+3 种基金the Natural Science Foundation of Jilin Province under grants No.SKL202302038the Chinese Academy of Sciences Youth Innovation Promotion Association under grants No.2023234the CITIC Dicastal Technical Cooperation Project under grants No.DK-YJY-20240003the Innovation Capability Enhancement Project of Baoding City under grants No.2494G034.
摘要The Mg-8Gd-3Er-0.5Ag-0.5Zr(wt.%)alloy fabricated by hot-extrusion+stamping exhibits an exceptional aging hardening response,with the yield strength being improved by>200 MPa.Traditional extrusion microstructure was observed in the as-extruded sample,with the elongated non-recrystallized grains showing typical(10.10)fiber texture.After stamping,almost all non-recrystallized grains were twinned mainly following the(10.12)twin orientation.This significantly changed precipitate morphologies formed during the following aging,from the well-known granularβ'precipitate into net-workβ'+β'H structure,with the granularβ'precipitates being connected by chain-likeβ'H precipitates.Additionally,a novel fault was found in theβ'precipitates,whose formation is highly related to the metastable I2-type stacking fault.This new precipitation structure means the effective interparticle spacing being approximately zero,and the faults in theβ'precipitates can not only enhance strength of precipitates but also could efficiently impede dislocation motion,thus resulted in positive contribution on alloy’s yield strength.This work provides new insights in developing high-strength Mg alloys by modifying precipitation structure along with the inner faults in precipitation.
基金supported by the National Natural Science Foundation of China(Nos.52171121,52201132,52201131,52371037)the Natural Science Foundation of Liaoning Province,China(No.2022-NLTS-18-01).
摘要A bimodal structure in the WE43 alloy was constructed through traditional extrusion.The results suggest that the dominant dynamic recrystallization(DRX)mechanism in the alloy extruded at 300℃(E300)is twin-induced DRX(TDRX),while the discontinuous DRX(DDRX)prevails when extruded at 330℃(E330)and 370℃(E370).For all three kinds of alloys,a decrease in extrusion temperature results in enhanced strength without a significant loss of ductility.Notably,the E300 alloy demonstrates outstanding comprehensive mechanical properties,with a yield strength of 325 MPa,an ultimate tensile strength of 365 MPa,and an elongation of 10.2%.Numerous blocky Mg14Nd2Y with size of~100 nm is formed within elongated grains,which contributes to the increased strength of E300 alloy.Additionally,the high-density of I1 stacking faults and fine blocky precipitates within elongated grains enhance ductility.
基金supported by the National Key Research and Development Program of China(Grant Nos.2024YFA1409200,2024YFA1611101,and 2024YFA1408303)the National Natural Science Foundation of China(Grant Nos.12504186,12534009,12447101,12374129,and 12374124)+5 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(CAS)(Grant No.XDB1270101)the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-084)the CAS Project(Grant No.JZHKYPT-2021-08)supported by Anhui Provincial Major S&T Project(Grant No.s202305a12020005)Anhui Provincial Natural Science Foundation(Grant Nos.2508085ZD013 and 2408085J025)supported by the High Magnetic Field Laboratory of Anhui Province(Contract No.AHHM-FX-2020-02)。
摘要Inspired by the recent discovery of metallic spin supersolidity and its giant magnetocaloric effect in the rareearth alloy EuCo2Al9,we perform a combined study through electronic structure analysis,effective spin model construction,and Monte Carlo simulations on a stacked triangular lattice(STL),and reveal a novel mechanism for the emergence of 3D spin supersolid in a metallic antiferromagnet.From first-principles inputs,we derive a minimal spin model on a STL,which arises from the interplay between Ruderman-Kittel-Kasuya-Yosida and dipolar interactions and accurately reproduces the experimental thermodynamics.Based on the STL model,we identify a ground state that simultaneously breaks discrete lattice translational symmetry and continuous spinrotational symmetry--the hallmark of a spin supersolid.Furthermore,we present the field-temperature phase diagram of the 3D STL model and discuss the various magnetic phases and associated phase transitions.Under zero field,the spin supersolid Y order establishes in two steps:an upper transition at TN1,where an emergent U(1)symmetry appears and the system enters a fluctuating collinear regime,followed by a lower transition at TN2into the spin supersolid Y phase.In contrast,the supersolid V phase undergoes a single phase transition at T.Our results not only provide a comprehensive theoretical understanding of the metallic spin supersolid reported for EuCo2Al9but also pave the way for further experimental investigations into its supersolid transitions and universality class.
摘要Intrusion detection in Internet of Things(IoT)environments presents challenges due to heterogeneous devices,diverse attack vectors,and highly imbalanced datasets.Existing research on the ToN-IoT dataset has largely emphasized binary classification and single-model pipelines,which often showstrong performance but limited generalizability,probabilistic reliability,and operational interpretability.This study proposes a stacked ensemble deep learning framework that integrates random forest,extreme gradient boosting,and a deep neural network as base learners,with CatBoost as the meta-learner.On the ToN-IoT Linux process dataset,the model achieved near-perfect discrimination(macro area under the curve=0.998),robust calibration,and superior F1-scores compared with standalone classifiers.Interpretability was achieved through SHapley Additive exPlanations–based feature attribution,which highlights actionable drivers ofmalicious behavior,such as command-line patterns,process scheduling anomalies,and CPU usage spikes,and aligns these indicators with MITRE ATT&CK tactics and techniques.Complementary analyses,including cumulative lift and sensitivity-specificity trade-offs,revealed the framework’s suitability for deployment in security operations centers,where calibrated risk scores,transparent explanations,and resource-aware triage are essential.These contributions bridge methodological rigor in artificial intelligence/machine learning with operational priorities in cybersecurity,delivering a scalable and explainable intrusion detection system suitable for real-world deployment in IoT environments.
基金supported by the National Natural Science Foundation of China (Grant No.12374109)the National Key Research and Development Program of China (Grant No.2023YFA1406600)。
摘要In physics,our expectations for system behavior are often guided by intuitive arithmetic.For systems composed of identical units,we anticipate synergy of the contributions from these units,where 1+1=2.Conversely,for systems built from opposing units,we expect cancellation of their contributions,where 1-1=0.This intuitive arithmetic has long underpinned our understanding of physical properties of materials,from electronic transport to optical responses.However,scientific breakthroughs often occur when nature reveals ways to circumvent these seemingly fundamental rules,opening new possibilities that challenge our deepest assumptions about material behavior.