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Accelerating homogenization kinetics and enhancing hot-workability of as-cast nickel-based superalloy via prior hot-deformation

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Journal of Iron and Steel Research International 2025年第1期32卷 215-226页

作者： Jia-jun Chen Yang Zhou Hao-ran Han Xian-guang Zhang Goro Miyamoto Ping-mei Tang Dong-ping Xiao Jian-hui Fu Peng Shi Yi-wu Pei Jian Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Co. Ltd.Chengdu 610300SichuanChina Institute for Materials Research Tohoku UniversitySendai 980-8577Aoba-KuJapan

Enhancing homogenization efficiency and hot-workability is the key issue for wrought superalloys in the industry.A novel approach for simultaneous accelerating the homogenization kinetics and improving hot-workability via a simple way of prior hot-deformation was proposed,which was not widely accepted for wrought *** homogenization efficiency is increased by 40%-70%via performing 10%-20%prior *** theoretical and experimental analyses revealed that the increment in homogenization efficiency is mainly attributed to the decrease in interdendritic-segregation spacing,and thus the necessary diffusion distance,rather than that of *** addition,dynamic and static recrystallizations occurred during the prior hot-deformation and diffusion-annealing processes,and the grains were significantly refined even after the ***,the size of the precipitates was refined as *** enhanced the hot-workability of the homogenized ingot for the subsequent cogging process.

关键词： Nickel-based superalloy Homogenization kinetics Prior hot-deformation Grain size Hot workability

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Metal-based inorganic nanocrystals for biological sonodynamic therapy applications:recent progress and perspectives

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Rare Metals 2024年第2期43卷 413-430页

作者： Dong Wang Jia-Tao Zhang Institute of Medical-Industrial Integration Beijing Key Laboratory of Structurally Controllable Advanced Functional Materials and Green ApplicationsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information TechnologySchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing100081China

With the fast development of technology for the treatment of tumor and bacteria,photo-therapeutic strate-gies emerge as a kind of highly effective and common treatment,but the low tissue penetration depth of light limits their *** therapy(SDT),as an efficient and non-invasive treatment,attracts more people's attention due to the inherent property of high tissue *** soft tissue penetration depth of ultrasound(US)can even reach more than 10 cm,which has great advantage over that of ***,many sonosensitizers are studied and applied to SDT-based ***-based inorganic nanocrystals are able to generate more reactive oxygen species(ROS)due to the special composition and band *** representative achievements and the specific functions of the nanocrystals sonosensitizers are summarized in this work,and the relationship of structure/composition-SDT performance and the internally regulated composite is ***-gistic effects of SDT in combination with other therapeutic modalities are mainly *** the same time,the critical and potential issues and future perspectives are addressed.

关键词： Metal-based inorganic nanocrystals Sonodynamic therapy(SDT) Tumor treatment Antibacteria

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Safe Efficient Policy Optimization Algorithm for Unsignalized Intersection Navigation

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 2011-2026页

作者： Xiaolong Chen Biao Xu Manjiang Hu Yougang Bian Yang Li Xin Xu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body the College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body the College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082 Wuxi Intelligent Control Research Institute(WICRI)of Hunan University Wuxi 214115China College of Intelligence Science and Technology Institute of Unmanned SystemsNational University of Defense TechnologyChangsha 410073China

Unsignalized intersections pose a challenge for autonomous vehicles that must decide how to navigate them safely and *** paper proposes a reinforcement learning(RL)method for autonomous vehicles to navigate unsignalized intersections safely and *** method uses a semantic scene representation to handle variable numbers of vehicles and a universal reward function to facilitate stable learning.A collision risk function is designed to penalize unsafe actions and guide the agent to avoid them.A scalable policy optimization algorithm is introduced to improve data efficiency and safety for vehicle learning at *** algorithm employs experience replay to overcome the on-policy limitation of proximal policy optimization and incorporates the collision risk constraint into the policy optimization *** proposed safe RL algorithm can balance the trade-off between vehicle traffic safety and policy learning *** intersection scenarios with different traffic situations are used to test the algorithm and demonstrate its high success rates and low collision rates under different traffic *** algorithm shows the potential of RL for enhancing the safety and reliability of autonomous driving systems at unsignalized intersections.

关键词： Autonomous driving decision-making reinforcement learning(RL) unsignalized intersection

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Acting out in real and virtual environments: Comparative analysis for future workstyle design 24

Acting out in real and virtual environments: Comparative ana...

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18th Biennial Participatory design Conference - Reaching Out: Connecting Beyond Participation, PDC 2024

作者： Watanabe, Kentaro Otsuki, Mai Kobayakawa, Maiko Kishita, Yusuke Ho, Bach Quang Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology Japan Faculty of Advanced Engineering Chiba Institute of Technology Japan Department of Precision Engineering School of Engineering The University of Tokyo Japan

ISBN: (纸本)9798400706547

Acting out is a representative experiential approach that is often used in participatory design. The use of enactment approaches to speculate on the future of work is driven by fast-paced implementation of emerging digital technologies. The enactment approaches using virtual reality (VR) attract attention for this purpose;however, there are limited studies looking into the advantages and drawbacks through the comparison among different enactment approaches. To address this research gap, this study conducts empirical comparative analysis of enactment approaches using two comparison axes: design environments (real/virtual) and perspectives in participation (first-/third-person view). The qualitative analysis of two workshops exploring future workstyles by using a prototype VR application, was conducted to investigate the advantages and drawbacks of each enactment approach. Our preliminary findings identified the fidelity of VR, and cultural and personal factors of participants as influential factors in enactment approach selection. © 2024 Owner/Author.

关键词： Virtual environments

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Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on L10-FePt nanoparticles

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Science China Chemistry 2025年第5期68卷 2027-2034页

作者： Jie Zhang Yi Chen Guijun Li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer EngineeringThe Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

L10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

关键词： organometallic precursor magnetic nanoparticles block copolymer self-assembly nanoimprint lithography

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Hot deformation characteristics and dynamic recrystallization behaviors of adamite cast steel for work rolls in hot rolling

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Metallurgia Italiana 2024年第7-8期115卷 6-11页

作者： An, Y.-J. Cho, K.-T. Jeon, J.-Y. Shin, S.-E. Kim, D.-G. Purpose Built Mobility Group Seonam Technology Application Division Korea Institute of Industrial Technology Korea Republic of Department of Materials Science and Metallurgical Engineering Sunchon National University Korea Republic of Materials Science and Chemical Engineering Center Institute for Advanced Engineering Korea Republic of

Hot workability and dynamic recrystallization(DRX) behavior of adamite cast steel used as work rolls for hot rolling were investigated in order to improve the service life through hot forging. The specimens were heated at the two different initial heating temperatures(IHT) of 1200 °C or 1100 °C. And the hot compression tests(HCT) were performed in temperature ranges from 1100 to 800 °C with the strain rate ranges from 1.0 to 0.001 s-1. In the processing maps, the stable hot working regions with η values as 31-24 % and positive ξ in the IHT of 1100 °C are larger than that of 1200 °C. In DRX behavior, the DRX fractions(fDRX) are higher than 50 % in all hot compressed specimens with the IHT of 1100 °C compared to the IHT of 1200 °C. The defects such as partial meltings or cracks at the HCT temperature of 1100 °C or 800 °C are observed in both the IHTs of 1200 °C and 1100 °C. However, the defects observed at the IHT of 1100 °C are significantly alleviated compared to the IHT of 1200 °C. © 2024 Associazione Italiana di Metallurgia. All rights reserved.

关键词： Compression testing

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A game-theoretic approach for federated learning:A trade-off among privacy,accuracy and energy

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Digital Communications and Networks 2024年第2期10卷 389-403页

作者： Lihua Yin Sixin Lin Zhe Sun Ran Li Yuanyuan He Zhiqiang Hao Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China School of Cyber Science and Engineering Huazhong University of Science and TechnologyWuhan430074China China Industrial Control Systems Cyber Emergency Response Team Beijing100040China

Benefiting from the development of Federated Learning(FL)and distributed communication systems,large-scale intelligent applications become *** devices not only provide adequate training data,but also cause privacy leakage and energy *** to optimize the energy consumption in distributed communication systems,while ensuring the privacy of users and model accuracy,has become an urgent *** this paper,we define the FL as a 3-layer architecture including users,agents and *** order to find a balance among model training accuracy,privacy-preserving effect,and energy consumption,we design the training process of FL as game *** use an extensive game tree to analyze the key elements that influence the players’decisions in the single game,and then find the incentive mechanism that meet the social norms through the repeated *** experimental results show that the Nash equilibrium we obtained satisfies the laws of reality,and the proposed incentive mechanism can also promote users to submit high-quality data in *** the multiple rounds of play,the incentive mechanism can help all players find the optimal strategies for energy,privacy,and accuracy of FL in distributed communication systems.

关键词： Federated learning Privacy preservation Energy optimization Game theory Distributed communication systems

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design and Testing of Netted Lace for Space Debris Removal Nets: Part 2

Design and Testing of Netted Lace for Space Debris Removal N...

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AIAA Science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Marks, Lisa Bowne, Madeline Robertson, Bradford Mavris, Dimitri Industrial Design College of Design Georgia Institute of Technology AtlantaGA30332 United States School of Aerospace Engineering Aerospace Systems Design Lab Georgia Institute of Technology AtlantaGA30332 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Active debris removal (ADR) is critical to remediate the growing threat of space debris. Guided net capture is a promising concept for catching large debris, such as rocket bodies. This paper focuses on the design and testing of nets for capturing debris, building on previous research that compared various net designs through an initial series of drop tests. The initial tests, evaluating two different net configuration types, radial and square cell, revealed that rectangular nets offered superior performance due to their uniform structure. A significant finding was the discrepancy between physical test failures and LS-Dyna model predictions, attributed to human error in net construction, which the model did not account for. To further improve the understanding and performance of net designs, a second round of drop tests was conducted exclusively on rectangular nets with 4 cm and 8 cm cell sizes. These tests aimed to observe the behavior of more accurately constructed nets without causing failure by dropping the same weight from a much lower height. Results from the second set of tests confirmed that nets with higher construction accuracy exhibited better performance, as predicted by LS-Dyna simulation results. This paper considers the implications of these findings for future net designs and the importance of precise construction in netted lace for ADR applications. © 2025, American institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Drops

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Path Tracking Controller design of Automated Parking Systems via NMPC with an Instructible Solution

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Chinese Journal of Mechanical engineering 2024年第3期37卷 353-367页

作者： Liang Chen Zhaobo Qin Manjiang Hu Yougang Bian Xiaoyan Peng State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Wuxi Intelligent Control Research Institute of Hunan University Wuxi 214115China

Parking difficulties have become a social issue that people have to *** parking system is practicable for quick par operations without a driver which can also greatly reduces the probability of parking *** paper proposes a Lyapunov-based nonlinear model predictive controller embedding an instructable solution which is generated by the modified rear-wheel feedback method(RF-LNMPC)in order to improve the overall path tracking accuracy in parking ***,A discrete-time RF-LNMPC considering the position and attitude of the parking vehicle is proposed to increase the success rate of automated parking ***,the RF-LNMPC problem with a multi-objective cost function is solved by the Interior-Point Optimization,of which the iterative initial values are described as the instructable solutions calculated by combining modified rear-wheel feedback to improve the performance of local optimal ***,the details on the computation of the terminal constraint and terminal cost for the linear time-varying case is *** closed-loop stability is verified via Lyapunov techniques by considering the terminal constraint and terminal cost ***,the proposed RF-LNMPC is implemented on a selfdriving Lincoln MKZ platform and the experiment results have shown improved performance in parallel and vertical parking *** Monte Carlo analysis also demonstrates good stability and repeatability of the proposed method which can be applied in practical use in the near future.

关键词： Automated parking Path tracking controller Nonlinear model predictive control Monte Carlo analysis

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Boosting Capacitive Deionization Performance of Commercial Carbon Fibers Cloth via Structural Regulation Based on Catalytic-Etching Effect

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Energy & Environmental Materials 2023年第1期6卷 242-252页

作者： Chunjie Zhang Dong Wang Zhen Wang Guangshuai Zhang Zhichao Liu Jie Wu Jin Hu Guangwu Wen School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China Shandong Industrial Ceramics Research&Design Institute Co. Ltd.Zibo 255000China

Monolithic carbon electrodes with robust mechanical integrity and porous architecture are highly desired for capacitive deionization but remain *** to the excellent mechanical strength and electroconductivity,commercial carbon fibers cloth demonstrates great potential as high-performance electrodes for ions *** this,its direct application on capacitive deionization is rarely reported in terms of limited pore structure and natural ***,a powerful metal-organic framework-engaged structural regulation strategy is developed to boost the desalination properties of carbon *** obtained porous carbon fibers features hierarchical porous structure and hydrophilic surface providing abundant ions-accessible sites,and continuous graphitized carbon core ensuring rapid electrons *** catalytic-etching mechanism involving oxidation of Co and subsequent carbonthermal reduction is proposed and highly relies on annealing temperature and holding *** directly evaluated as a current collector-free capacitive deionization electrode,the porous carbon fibers demonstrates much superior desalination capability than pristine carbon fibers,and remarkable cyclic stability up to 20 h with negligible ***,the PCF-1000 showcases the highest areal salt adsorption capacity of 0.037 mg cm^(−2) among carbon ***,monolithic porous carbon fibers-carbon nanotubes with increased active sites and good structural integrity by in-situ growth of carbon nanotubes are further fabricated to enhance the desalination performance(0.051 mg cm^(−2)).This work demonstrates the great potential of carbon fibers in constructing high-efficient and robust monolithic electrode for capacitive deionization.

关键词： capacitive deionization carbon fibers cloth catalytic-etching monolithic electrodes

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