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Synergistic effect of gradient Zn content and multiscale particles on the mechanical properties of Al-Zn-Mg-Cu alloys with coupling distribution of coarse-fine grains

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1392-1405页

作者： Liangliang Yuan Mingxing Guo Yi Wang Yun Wang Linzhong Zhuang Institute of Effectiveness Evaluation of Flying Vehicle Beijing 100085China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China

This study investigated the influence of graded Zn content on the evolution of precipitated and iron-rich phases and grain struc-ture of the alloys,designed and developed the Al–8.0Zn–1.5Mg–1.5Cu–0.2Fe(wt%)alloy with high strength and *** the increase of Zn content,forming the coupling distribution of multiscale precipitates and iron-rich phases with a reasonable matching ratio and dispersion distribution characteristics is *** phenomenon induces the formation of cell-like structures with alternate distribu-tion of coarse and fine grains,and the average plasticity–strain ratio(characterizing the formability)of the pre-aged alloy with a high strength is up to *** reveal the evolution and influence mechanisms of multiscale second-phase particles and the corresponding high formability mechanism of the *** developed coupling control process exhibits considerable potential,revealing remarkable improvements in the room temperature formability of high-strength Al–Zn–Mg–Cu alloys.

关键词： Al–Zn–Mg–Cu alloy iron-rich phase high formability microstructure mechanisms

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A Decentralized Control Method of Battery Energy Storage Units With Different State of Charge 10

A Decentralized Control Method of Battery Energy Storage Uni...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Choi, Seung-Hyun Kim, Jae-Sang Kim, Joonsu Bang, Jihun Moon, Gun-Woo Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)9798350351330

Power capacity of battery energy storages (BESs) should be large to stabilize microgrids. To maximize the total available power capacity of the BESs, state of charge (SoC) balancing control is essential. Therefore, several SoC- adaptive droop control methods have been developed to balance the SoC among the BESs. However, the conventional control methods have slow balancing speed due to limited droop gain, potentially reducing the available power capacity. To address the limitation, this paper employs a novel adaptive nonlinear droop control method. The proposed control method uses output power as an additional variable to adjust the droop gain, leading to a nonlinear relationship between output voltage and output power. Using the nonlinearity, the proposed control method can have larger droop gains, ultimately improving SoC balancing speed. The effectiveness of the proposed control method was demonstrated through both theoretical analysis and lab-scale experiments. © 2024 IEEE.

关键词： Decentralized control

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Reconfiguration of vertex-disjoint shortest paths on graphs

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Journal of Graph Algorithms and Applications 2024年第3期28卷 87-101页

作者： Saito, Rin Eto, Hiroshi Ito, Takehiro Uehara, Ryuhei Graduate School of Information Sciences Tohoku University Sendai Japan School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan School of Information Science Japan Advanced Institute of Science and Technology Nomi Japan

We introduce and study reconfiguration problems for (internally) vertex-disjoint shortest paths: Given two tuples of internally vertex-disjoint shortest paths for fixed terminal pairs in an unweighted graph, we are asked to determine whether one tuple can be transformed into the other by exchanging a single vertex of one shortest path in the tuple at a time, so that all intermediate results remain tuples of internally vertex-disjoint shortest paths. We also study the shortest variant of the problem, that is, we wish to minimize the number of vertex-exchange steps required for such a transformation, if exists. These problems generalize the well-studied Shortest Path Reconfiguration problem. In this paper, we analyze the complexity of these problems from the viewpoint of graph classes, and give some interesting contrast. © 2024, Brown University. All rights reserved.

关键词： Graph theory

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Recent Advances in Redox Flow Batteries Employing Metal Coordination Complexes as Redox-Active Species

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Electrochemical Energy Reviews 2024年第1期7卷 204-232页

作者： Bin Liu Yiju Li Guocheng Jia Tianshou Zhao Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Chemistry The Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Institute for Advanced Study The Hong Kong University of Science and TechnologyKowloonHong Kong 999077China

Redox flow batteries(RFBs)that employ sustainable,abundant,and structure-tunable redox-active species are of great interest for large-scale energy *** a vital class of redox-active species,metal coordination complexes(MCCs)possessing the properties of both the organic ligands and transition metal ion centers are attracting increasing attention due to the advantages of multielectron charge transfer,high structural tailorability,and reduced material ***,we present a critical overview of RFBs that employ MCCs as redox-active materials in both aqueous and nonaqueous *** progress is comprehensively summarized,including the design strategies,solubility characteristics,electrochemical properties,and battery cycling performance of *** is placed on the ligand selection and modification strategies used to tune the critical properties of MCCs,including their redox potential,solubility,cycling stability,and electron transfer redox reactions,to achieve stable cycled RFBs with a high energy ***,we discuss the current challenges and perspectives related to the development of MCC-based RFBs for large-scale energy storage implementations.

关键词： Energy storage Redox flow battery Metal coordination complex Electrochemistry Redox noninnocent ligands

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Atomic tailoring-induced deficiency in tungsten oxides for high-performance energy-related devices

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Tungsten 2024年第2期6卷 269-277页

作者： Jing-Huang Lin Yao-Tian Yan Jun-Lei Qi Chen-Yang Zha Institute of Applied Physics and Materials Engineering Zhuhai UM Science and Technology Research InstituteUniversity of MacaoTaipaMacao SAR 999078China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Jiangmen Laboratory of Carbon Science and Technology Hong Kong University of Science and Technology(Guangzhou)Jiangmen 529199China Key Laboratory of Flexible Electronics School of Flexible Electronics(Future Technologies)Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211816China

Nowadays,tungsten oxides,as a typical transition metal oxide,are widely and intensively investigated owing to their excellent material properties and device *** oxygen defi ciency in tungsten oxides is typically the key to enhance their performances for a variety of critical technological *** a gradual increase of oxygen defi ciency,various non-stoichiometric tungsten oxides can be formed by re-adjustment of the atomic arrangement,which exhibits superior performances than their traditional stoichiometric *** review mainly focuses on the recent advances in oxygen-defi cient tungsten oxides from the point of atomic structures,including the forming mechanism of non-stoichiometric tungsten oxides and the superiority of these oxygen-defi cient tungsten oxides in energy-related ***,the challenge and perspective of oxygen-defi cient tungsten oxides are also discussed.

关键词： Oxygen defi ciency Tungsten oxide Atomic structures Catalyst Storage

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Insights into the Origins of Solar-Assisted Electrochemical Water Oxidation in Allotropic Co_(5.47)N/CON Heterojunctions

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Energy & Environmental Materials 2024年第5期7卷 234-243页

作者： Sirui Liu Qiong Gao Bo Geng Lili Wu Zhikun Xu Xinzhi Ma Shijie Liu Boquan Li Mingyi Zhang Lirong Zhang Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China School of Physics and Engineering Henan University of Science and Technology Luoyang 471023China School of Science Guangdong University of Petrochemical TechnologyMaoming 525000China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China College of Science Southern University of Science and TechnologyShenzhen 518055China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Solar irradiation can efficiently promote the kinetics of the oxygen evolution reaction(OER)during water splitting,where heterojunction catalysts exhibit excellent photoresponsive ***,insights into the origins of photoassisted OER catalysis remain unclear,especially the interfaced promotion under convergent solar irradiation(CSI).Herein,novel allotropic Co_(5.47)N/CoN heterojunctions were synthesized,and corresponding OER mechanisms under CSI were comprehensively uncovered from physical and chemical aspects using the in situ Raman technique and electrochemical cyclic voltammetry *** results provide a unique mechanism where high-energy UV light promotes the Co^(3+/4+)conversion process in addition to the ordinary photoelectric effect excitation of the Co^(2+)***,visible light under CSI can produce a photothermal effect for Co^(2+)excitation and Co^(3+/4+)conversion,which promotes the OER significantly more than the usual photoelectric *** a result,Co_(5.47)N/CoN(containing 28%CoN)obtained 317.9%OER enhancement,which provides a pathway for constructing excellent OER catalysts.

关键词： chemical origins in situ Raman OER photothermal effect physical origins

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CORN: CONTACT-BASED OBJECT REPRESENTATION FOR NONPREHENSILE MANIPULATION OF GENERAL UNSEEN OBJECTS 12

CORN: CONTACT-BASED OBJECT REPRESENTATION FOR NONPREHENSILE ...

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12th International Conference on Learning Representations, ICLR 2024

作者： Cho, Yoonyoung Han, Junhyek Cho, Yoontae Kim, Beomjoon Korea Advanced Institute of Science and Technology Korea Republic of

Nonprehensile manipulation is essential for manipulating objects that are too thin, large, or otherwise ungraspable in the wild. To sidestep the difficulty of contact modeling in conventional modeling-based approaches, reinforcement learning (RL) has recently emerged as a promising alternative. However, previous RL approaches either lack the ability to generalize over diverse object shapes, or use simple action primitives that limit the diversity of robot motions. Furthermore, using RL over diverse object geometry is challenging due to the high cost of training a policy that takes in high-dimensional sensory inputs. We propose a novel contact-based object representation and pretraining pipeline to tackle this. To enable massively parallel training, we leverage a lightweight patch-based transformer architecture for our encoder that processes point clouds, thus scaling our training across thousands of environments. Compared to learning from scratch, or other shape representation baselines, our representation facilitates both time- and data-efficient learning. We validate the efficacy of our overall system by zero-shot transferring the trained policy to novel real-world objects. Code and videos are available at https://***/view/contact-non-prehensile. © 2024 12th International Conference on Learning Representations, ICLR 2024. All rights reserved.

关键词： Reinforcement learning

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EPHA2 is a novel cell surface marker of OCT4-positive undifferentiated cells during the differentiation of mouse and human pluripotent stem cells (May, szae036, 2024)

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STEM CELLS TRANSLATIONAL MEDICINE 2024年第9期13卷 940-940页

作者： Intoh, Atsushi Watanabe-Susaki, Kanako Kato, Taku Kiritani, Hibiki Kurisaki, Akira Division of Biological Science Nara Institute of Science and Technology Nara 630-0192 Japan. Organ Development Research Laboratory National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8560 Japan.

Embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs) possess the intrinsic ability to differentiate into diverse cellular lineages, marking them as potent instruments in regenerative medicine. Nonetheless, the proclivity of these stem cells to generate teratomas post-transplantation presents a formidable obstacle to their therapeutic utility. In previous studies, we identified an array of cell surface proteins specifically expressed in the pluripotent state, as revealed through proteomic analysis. Here we focused on EPHA2, a protein found to be abundantly present on the surface of undifferentiated mouse ESCs and is diminished upon differentiation. Knock-down of Epha2 led to the spontaneous differentiation of mouse ESCs, underscoring a pivotal role of EPHA2 in maintaining an undifferentiated cell state. Further investigations revealed a strong correlation between EPHA2 and OCT4 expression during the differentiation of both mouse and human PSCs. Notably, removing EPHA2+ cells from mouse ESC-derived hepatic lineage reduced tumor formation after transplanting them into immune-deficient mice. Similarly, in human iPSCs, a larger proportion of EPHA2+ cells correlated with higher OCT4 expression, reflecting the pattern observed in mouse ESCs. Conclusively, EPHA2 emerges as a potential marker for selecting undifferentiated stem cells, providing a valuable method to decrease tumorigenesis risks after stem-cell transplantation in regenerative treatments.

关键词： EPHA2 cell surface marker pluripotent stem cells stem cell transplantation tumorigenesis

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Crystalline/Non-Crystalline Carbon Co-Modified Strategy to Construct N,S Co-Doped Carbon Layer Wrapped Fe_(0.95)S_(1.05)/Carbon Nanotubes for Enhanced Lithium Storage Property

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 93-101页

作者： Liang Chen Lan−Yun Yang Li−Ting Zeng Xu Liu Xin−Rui Li Yu−Shan Tian Wei Wang Gang−Yong Li Chen−Xi Xu Zhao−Hui Hou Key Laboratory of Hunan Province for Advanced Carbon‒based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang414006China College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China

Due to their high theoretical capacity and abundant resources,transition metal sulfides are regarded as a prospering alternative to replace the commercial graphite anode in lithium-ion batteries(LIBs),particularly for large-scale energy storage and conversion ***,low conductivity,easy agglomeration and obvious volume change greatly impede their practical *** this work,a novel crystalline/non-crystalline carbon co-modified strategy is proposed to fabricate N,S co-doped carbon(NSC)layer wrapped Fe_(0.95)S_(1.05)/carbon nanotubes(CNTs)composite(Fe_(0.95)S_(1.05)/CNTs@NSC)through a simple Fenton reaction followed by a sulfurization *** characterizations and analyses reveal that this strategy well combines the advantages of crystalline CNTs and non-crystalline NSC,ensuring good conductivity and a high contribution to capacity from the carbon ***,the joint encapsulation of Fe_(0.95)S_(1.05)by both CNTs and NSC can significantly mitigate the agglomeration and volume change of Fe_(0.95)S_(1.05)during the continuous charge/discharge *** from these advantageous features,the resultant Fe_(0.95)S_(1.05)/CNTs@NSC composite displays much improved cycling stability and rate capability when compared to the ***,our research offers a distinct and innovative approach to design and construct advanced transition metal sulfides/carbon composite anodes for LIBs.

关键词： Lithium-ion batteries Crystalline/non-crystalline carbon Joint encapsulation Fe_(0.95)S_(1.05)/CNTs@NSC Lithium storage property

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Examine the Incorporation of Integration of Imaging Data for Orthodontic Prediction 6

Examine the Incorporation of Integration of Imaging Data for...

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6th IEEE International Conference on Emerging Smart Computing and Informatics, ESCI 2024

作者： Ramyaalakshmi, A. Poonguzhali, S. Vels Institute of Science Technology and Advanced Studies India

ISBN: (纸本)9798350306613

This study examines the crucial but final decision about tooth extraction during orthodontic therapy. The oral health and general wellbeing of individuals are significantly impacted by this choice. In the past, orthodontists' knowledge and clinical assessments were used to make these decisions. However, the development of machine learning (ML) and artificial intelligence (AI) offers a chance to improve the accuracy and predictability of these choices. With the goal of revolutionising orthodontic practise, this study will create and evaluate an AI-based orthodontist prediction model. An informed and accurate approach is required due to the significant effects that tooth extraction decisions have on orthodontic treatment. By developing an AI-based orthodontist prediction model, our research initiative aims to close this gap. This model can be used as a guide for people interested in pursuing careers in orthodontics, in addition to helping the current orthodontic practise by offering insightful information on tooth extraction choices. There usher in a new era of oral healthcare by embracing technology breakthroughs in orthodontics, which will result in better patient results and well-informed decision-making. © 2024 IEEE.

关键词： Artificial Neural Networks Decision Tree K-Nearest Neighbour Machine learning and Orthodontic

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