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Segregation behaviors in{101^(-)1}compressive twin boundaries of Mg-RE alloy under deformation at room temperature

Journal of Magnesium and Alloys 2025年第1期13卷 330-337页

作者： Yujie Cui Lili Guo Yunwei Gui Kenta Aoyagi Haotian Tong Qinqin Wei Fangzhou Liu Yuichiro Hayasaka Akihiko Chiba Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced Materials Processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi 980-8577Japan Department of Materials Science and Engineering Jilin University5988 Renmin StreetChangchunJilin 130025China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China The Electron Microscopy Center Tohoku UniversitySendai 980-8577Japan

Solute atoms and precipitates significantly influence the mechanical properties of Mg *** studies have mainly focused on the segregation behaviors of Mg alloys after *** this study,we investigated the segregation behaviors of an Mg-RE alloy under *** 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 *** segregated solutes and precipitates impeded the twin growth,partially contributing to the formation of small-sized{101^(-)1}compressive *** research indicates the twin boundaries can be strengthened by segregated solutes and precipitates formed under deformation at room temperature.

关键词： Magnesium alloys Compression test Scanning/transmission electron microscopy(STEM) Segregation Twin boundaries

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A cluster-plus-glue-atom composition design approach designated for multi-principal element alloys

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Rare Metals 2022年第11期41卷 3839-3849页

作者： Xuan Liu Hui-Bin Ke Liang Wang Yao-Jian Liang Lin-Jing Wang Ben-Peng Wang Lu Wang Qun-Bo Fan Yun-Fei Xue School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China

Multi-principal element alloys(MPEAs)have shown extraordinary properties in different ***,the composition design of MPEAs is still challenging due to the complicated interactions among principal elements(PEs),and even more challenging with precipitates *** can be either beneficial or detrimental in alloys,thus it is important to control precipitates formation on purpose during alloy *** this work,cluster-plus-glue-atom model(CGM)composition design method which is usually used to describe short-range order in traditional alloys has been successfully extended to MPEAs for precipitation *** key challenge of extending CGM to MPEAs is the determination of center atom since there are no solvent or solute in *** has found that the element type of center atom was related not only with chemical affinity,but also with atomic volume difference in MPEAs,which has inevitable effect on atomic *** on experimental data of MPEAs with precipitates,it was found that elements with either stronger chemical affinity or larger volume difference with other PEs would occupy the center site of ***,a cluster index(P_(C)),which considers both chemical affinity and atomic volume factors,was proposed to assist the determination of center atom in *** on the approach,a solid-solution Zr-Ti-V-Nb-Al BCC alloy was obtained by inhibiting the precipitation,while precipitation-strengthened Al-Cr-FeNi-V FCC alloy and Al-Co-Cr-Fe-Ni BCC alloy were designed by promoting the *** experimental results demonstrated that the approach could provide a relatively simple and accurate predication of precipitation and the compositions of precipitations were in line with PEs in cluster in *** research may open an effective way for composition design of MPEAs with desired phase structure.

关键词： Multi-principal element alloy(MPEA) Composition design Phase structure Cluster-plus-glue-atom model(CGM)

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DSNet: Lane Centerline Reconstruction with a Driving Scene Reasoning Network 24

DSNet: Lane Centerline Reconstruction with a Driving Scene R...

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4th Asia-Pacific Artificial Intelligence and Big Data Forum, AIBDF 2024

作者： Li, Jun Shen, Yuanhua Nie, Jun Ye, Xun Wang, Zeyu Liu, Shengqiang Zhao, Ning University of Science and Technology of China Anhui Hefei China Institute of Advanced Technology University of Science and Technology of China Anhui Hefei China

ISBN: (纸本)9798400710865

In the field of autonomous driving, accurate detection and tracking of lanes play pivotal roles in ensuring safe and efficient navigation. Traditionally, navigation relies on pre-existing high-definition maps. However, a revolutionary approach is emerging - one that harnesses the power of vehicle-surrounding images for real-time lane reconstruction. We introduce a novel approach called DSNet, which is designed for real-time inference of driving scene topology and online construction of lane centerlines using topology heatmaps derived from information in the driving scene. DSNet uses topology heatmaps to facilitate the exchange of information between lane centerlines, allowing them to share insights while also enabling information exchange between traffic elements and lane centerlines. We evaluate our approach on OpenLane-V2, a comprehensive benchmark for topology reasoning. DSNet achieved outstanding results in the reconstruction of lane centerlines, particularly in complex scenarios. © 2024 Copyright held by the owner/author(s).

关键词： Autonomous driving

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Kohn–Sham time-dependent density functional theory with Tamm–Dancoff approximation on massively parallel GPUs

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npj Computational Materials 2023年第1期9卷 1556-1567页

作者： Inkoo Kim Daun Jeong Won-Joon Son Hyung-Jin Kim Young Min Rhee Yongsik Jung Hyeonho Choi Jinkyu Yim Inkook Jang Dae Sin Kim Innovation Center Samsung ElectronicsHwaseong 18448Republic of Korea Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Samsung Advanced Institute of Technology Samsung ElectronicsSuwon 16678Republic of Korea

We report a high-performance multi graphics processing unit(GPU)implementation of the Kohn–Sham time-dependent density functional theory(TDDFT)within the Tamm–Dancoff *** algorithm on massively parallel computing systems using multiple parallel models in tandem scales optimally with material size,considerably reducing the computational wall time.A benchmark TDDFT study was performed on a green fluorescent protein complex composed of 4353 atoms with 40,518 atomic orbitals represented by Gaussian-type functions,demonstrating the effect of distant protein residues on the *** the largest molecule attempted to date to the best of our knowledge,the proposed strategy demonstrated reasonably high efficiencies up to 256 GPUs on a custom-built state-of-the-art GPU computing system with Nvidia A100 *** believe that our GPU-oriented algorithms,which empower first-principles simulation for very large-scale applications,may render deeper understanding of the molecular basis of material behaviors,eventually revealing new possibilities for breakthrough designs on new material systems.

关键词： GPUs graphics massive

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Pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure for display application

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Nano Research 2024年第12期17卷 10476-10482页

作者： Mingrui Liu Chenhui Wang Peng Huang Jinhua He Muhammad Ramzan Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Blue emissive quantum dots are key materials in fabricating quantum-dot light-emitting diodes for display *** to date,most of the previous blue emissive quantum dots are based on quantum dots with type-I core-shell *** this work,we report pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure,which show high photoluminescence quantum yield over 90%.The type-II structure was investigated by applying time-resolved photoluminescence and transient absorption measurements,illustrating the extended photoluminescence decay lifetime of ZnSe/Cd_(x)Zn_(1-x)S quantum dots as well as the transition of bleaching peak from the valence band of ZnSe to the conduction band of *** further fabricated ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots based electroluminescence devices,achieving a maximum external quantum efficiency of 6.7%and a maximum luminance of 39,766 cd·m^(-2).

关键词： quantum dots blue emitter type-II display core shell

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TrinityMag:A novel magnetically actuated miniature robot manipulating system with a human-scale workspace

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science China(Technological sciences) 2024年第11期67卷 3546-3558页

作者： LI Dong CHEN BinHan HUANG ChenYang XU Sheng WU XinYu XU TianTian Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Key Laboratory of Biomedical Imaging Science and System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

The development of the magnetic manipulating system is essential for applications of magnetically actuated miniature robots in biomedical practice,such as targeted therapy and precise ***,the workspaces of existing magnetic manipulating systems for miniature robots are mostly insufficient to manipulate miniature robots inside human *** present study proposes an innovative electromagnets-based manipulating system,TrinityMag,which can produce dynamic three-dimensional(3D)magnetic fields in a human-scale spherical workspace with a 2.6 m *** magnetic field of a single electromagnet is simulated,and a new calibration technic is designed based on deep learning ***,the arrangement of three electromagnets is optimized to produce maximal 3D arbitrary magnetic fields with limited ***,a target-tracking algorithm is developed so that the TrinityMag can track the miniature robot in real ***,the TrinityMag is validated in experiments to manipulate a soft millirobot to move in human-scale tortuous tracks with two types of *** maximum speed of the soft millirobot reaches 11.05 body length/*** work contributes to a significant increment in the workspace of the electromagnets-based manipulating system for miniature *** further expect that the TrinityMag could push the applications of miniature robots from laboratory to clinical practice.

关键词： magnetic manipulating system human-scale workspace magnetically actuated miniature robots

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Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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Journal of Iron and Steel Research International 2024年第2期31卷 475-487页

作者： Shi-guang Xu Jin-shan He Run-ze Zhang Fu-cheng Zhang Xi-tao Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004HebeiChina Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystallization(SRX)behaviors and corresponding recrystallization mechanisms of 7Mo super-austenitic stainless steel were studied under different deformation *** order of influence of deformation parameters on static recrystallization behaviors,from high to low,is followed by temperature,first-stage strain and strain ***,the effect of holding time on static recrystallization behaviors is significantly controlled by *** addition,with the increase in temperature from 1000 to 1200°C,the static recrystallization mechanism evolves from discontinuous static recrystallization and continuous static recrystallization(cSRX)to metadynamic recrystallization and cSRX,and finally to *** cSRX exists at all *** is because high stacking fault energy(56 mJ m−2)promotes the movement of dislocations,making the deformation mechanism of this steel is dominated by planar slip of *** undissolved sigma precipitates promote static recrystallization through particle-stimulated ***,small strain-induced precipitates at grain boundaries hinder the nucleation of conventional SRX and the growth of recrystallized grains,while the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainless steel Double-stage hot deformation Conventional static recrystallization Metadynamic recrystallization Strain-induced precipitation

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Study on the Relationship Between Humidity and Under-Deposit Corrosion in High Strength Medium Manganese Steel

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Journal of Bio- and Tribo-Corrosion 2024年第4期10卷 1-14页

作者： Luo, Xingshui Liu, Heng Liu, Menghao Ye, Qizhe Qiao, Lijie Yan, Yu Beijing Advanced Innovation Center for Materials Genome Engineering Corrosion and Protection Center Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China School of Materials Science and Engineering Beihang University Beijing China

This study examines the behavior of under-deposit corrosion in M10C medium manganese steel when subjected to three distinct levels of relative humidity—60%, 80%, and 100%. The research employs X-ray diffraction, scanning electron microscopy, and confocal laser scanning microscopy to observe and statistically analyze the corrosion product phases, corrosion product morphology, and maximum pit dimensions on the sample surfaces. The results indicate that under-deposit corrosion occurs only when the relative humidity reaches a critical threshold value, which falls between 60 and 80%. This phenomenon is attributed to the hygroscopic dissolution of NaCl particles within the deposit layer, as they absorb sufficient moisture from the surrounding air, leading to the formation of a corrosive thin liquid film on the surface of the medium manganese steel. As the relative humidity increases, medium manganese steel under-deposit corrosion develops faster and corrosion is more pronounced. Under 100% relative humidity conditions, the medium manganese steel is most susceptible to pitting corrosion. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Scanning electron microscopy

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Hierarchical Voronoi Structure Inspired by Cat Paw Pads Substantially Enhances Landing Impact Energy Dissipation

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Journal of Bionic Engineering 2024年第4期21卷 1847-1861页

作者： Da Lu Baoqing Pei Yangyang Xu Mengyuan Hu Shijia Zhang Le Zhang Xin Huang Yangwei Wang Xueqing Wu Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable&Interventional Medical Devices Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang University100083BeijingChina National Key Laboratory of Science and Technology on Materials under Shock and Impact Beijing Institute of Technology100081BeijingChina Shenzhen Institute of Beihang University 518000ShenzhenChina

When a human lands from a high drop,there is a high risk of serious injury to the lower *** the other hand,cats can withstand jumps and falls from heights without being fatally wounded,largely due to their impact-resistant paw *** aim of the present study was to investigate the biomechanism of impact resistance in cat paw pads,propose an optimal hierarchical Voronoi structure inspired by the paw pads,and apply the structure to bionic cushioning shoes to reduce the impact force of landing for *** microstructure of cat paw pads was observed via tissue section staining,and a simulation model was reconstructed based on CT to verify and optimize the structural cushioning *** distribution pattern,wall thickness of compartments,thickness ratio of epidermis and dermis,and number of compartments in the model were changed and simulated to achieve an optimal composed structure.A bionic sole was 3D-printed,and its performance was evaluated via compression test and a jumping-landing *** results show that cat paw pads are a spherical cap structure,divided from the outside to the inside into the epidermis,dermis,and compartments,each with different cushioning capacities.A finite element simulation of different cushioning structures was conducted in a cylinder with a diameter of 20 mm and a height of 10 mm,featuring a three-layer *** optimal configuration of the three layers should have a uniform distribution with 0.3–0.5 mm wall thickness,a 1:1–2 thickness ratio of epidermis and dermis,and 100–150 compartments.A bionic sole with an optimized structure can reduce the peak impact force and delay the peak arrival *** energy absorption rate is about 4 times that of standard *** jumping 80,100,and 120 cm,the normalized ground reaction force is also reduced by 8.7%,12.6%and 15.1%compared with standard *** study provides theoretical and technical support for effective protection against human lower limb landing injuries.

关键词： Cat paw pads Hierarchical Voronoi structure Landing impact Energy dissipation Bionic sole

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An Enhanced Augmented Coprime Array With Low Mutual Coupling and High DOFs

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IEEE Transactions on Vehicular technology 2025年第5期74卷 7676-7687页

作者： Han, Liang Zhao, Yijiu Mei, Sitao Zhao, Xinyi Wang, Houjun Zhang, Bo University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study Shenzhen518110 China University of Electronic Science and Technology of China School of Automation Engineering Chengdu611731 China University of Electronic Science and Technology of China School of Optoelectronic Science and Engineering Chengdu611731 China

Coprime array (CA) has gained significant attention due to its high degrees of freedom (DOFs) and large array aperture. Previous researches have focused on improving coprime arrays, but few studies have successfully combined a large array aperture, low mutual coupling, and high DOFs with the number of array elements. In this paper, we propose a novel semi-symmetrical augmented coprime array (SSACA) that strategically positions sensors by arranging M-subarrays and symmetric N-subarrays. This design reduces redundancy lags, and increases DOFs, continuous DOFs, and array aperture, thereby mitigating mutual coupling effects and improving angular resolution for the direction of arrival (DOA) estimation. We derive closed-form expressions for the DOFs, continuous DOFs, and array aperture of SSACA. Simulation results demonstrate that the proposed SSACA outperforms the existing studies regarding higher DOFs, reduced mutual coupling effects, and lower root mean square error (RMSE) in similar application scenarios, particularly in strong mutual coupling scenarios. © 1967-2012 IEEE.

关键词： Sensor arrays Sensors Mutual coupling Array signal processing Direction-of-arrival estimation Estimation Vectors Apertures Couplings Signal processing algorithms

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