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Science China Materials 2022年第2期66卷 793-800页

作者： Yao, Yilin Du, Qing Cao, Yihuan Wu, Yuan Wang, Xianzhen Liu, Xiongjun Wang, Hui Jiang, Suihe Lu, Zhaoping Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing China

Metallic glasses (MGs) are intrinsically metastable, and tend to relax and crystallize at elevated temperatures. However, it is generally believed that their amorphous nature at room temperature can be retained for a sufficiently long time. Herein, we report the long-term stability of a series of Cu-Zr MGs in natural environment after twelve years. Surprisingly, the Cu-Zr MGs with a low Zr content (i.e., below 66.7 at%) encountered severe instability, which was induced by room-temperature oxidation. Although those with a high Zr content preserve the shiny surfaces due to the formation of a dense ZrO2 layer, their thermal properties (e.g., glass transition temperature Tg and onset crystallization temperature Tx) are appreciably changed due to oxygen permeation. Our findings not only shed light on the understanding of the thermal stability of MGs in general, but also have important implications for engineering applications of these disordered solids.

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Multi-parameter control of photodetection in van der Waals magnet CrSBr

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Light(Science & Applications) 2025年第3期14卷 713-720页

作者： Shiqi Yango Zhigang Song Yuchen Gao Leyan Huang Xinyue Huang Pingfan Gu Wenjng Liu Zuxin Chen Yu Ye State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA02138USA Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China Collaborative Innovation Centre of Quantum Matter Bejing 100871China Yangtze Delta Institute of Optoelectronics Peking UniversityNantong 226010 JiangsuChina Liaoning Academy of Materials Shenyang110167China

Photodetectors equipped with multi-parameter control hold the potential to deliver exceptional performance in a wide range of scenarios,paving the way for developing novel spin-opto-electronic ***,the integration of such capabilities within a single device is challenging due to the necessity of harmonizing multiple materials with varying degrees of *** this study,we introduce the van der Waals magnet CrSBr,featuring inherent anisotropy and distinctive spin-electronic coupling,to this *** linear dichroic ratio of the photocurrent in CrSBr tunneling device can reach~60 at 1.65 K,and the photoresponse experiences a significant boost with increasing magnetic ***,the unique spin-charge coupling engenders a photon energy-dependent photocurrent that is modulated by an external field and is validated by first-principle *** findings elucidate the effective multi-parameter control of photodetection based on vdWs magnet CrsBr,highlighting its potential applications in cutting-edge optoelectronic devices and as a highly sensitive probe medium.

关键词： van der waals magnet crsbr linear dichroic ratio multi parameter control photon energy dependent photocurrent van der waals magnet crsbrfeaturing photoresponse harmonizing multiple materials photodetection

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石墨Gibbs表面自由能对锂离子电池传统负极浆初始黏度和稳定性的影响

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Journal of Central South University 2023年第3期30卷 665-676页

作者：周奇文博张佳丽刘锋欧阳晓平梁伊丽吴泽轶谢志勇 State Key Laboratory of Powder Metallurgy(Central South University) Changsha 410083China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals(Kunming Institute of Precious Metals) Kunming 650106China Key Laboratory of Low Dimensional Materials and Application Technology(Xiangtan University) Ministry of EducationXiangtan 411105China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China©Central South University 2023

负极浆料的初始黏度和稳定性对锂离子电池的生产工艺和后期性能至关重要。但是关于石墨原料的理化性质对负极浆料初始黏度和稳定性的影响尚未从根本上阐明。通过对不同粒度和比表面积的商业化石墨进行初始黏度测试,发现负极浆料的初始... 详细信息

负极浆料的初始黏度和稳定性对锂离子电池的生产工艺和后期性能至关重要。但是关于石墨原料的理化性质对负极浆料初始黏度和稳定性的影响尚未从根本上阐明。通过对不同粒度和比表面积的商业化石墨进行初始黏度测试,发现负极浆料的初始黏度与石墨的非极性Gibbs表面自由能呈正相关。同时还发现,Gibbs表面自由能极性部分和非极性部分的相对大小对负极浆料的稳定性有影响。当Gibbs表面自由能极性部分接近非极性部分时,制备的浆料具有最佳的稳定性,且静置120 h以后克容量保持稳定。有趣的是,XRD和Raman光谱表征结果显示石墨粒子的Gibbs表面自由能与缺陷之间没有直接的线性关系。本研究可为锂离子电池工业生产中石墨原料的选择提供指导。

关键词：锂离子电池 Gibbs表面自由能石墨负极浆料

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ROMA: ROtary and Movable Antenna

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IEEE Wireless Communications Letters 2025年

作者： Zhang, Jiayi Yi, Wenhui Xu, Bokai Wang, Zhe Xiao, Huahua Ai, Bo State Key Laboratory of Advanced Rail Autonomous Operation China Beijing Jiaotong University School of Electronics and Information Engineering Beijing100044 China State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE Corporation Shenzhen518055 China

The rotary and movable antenna (ROMA) architecture represents a next-generation multi-antenna technology that enables flexible adjustment of antenna position and array rotation angles of the transceiver. In this letter, we propose a ROMA-aided multi-user MIMO communication system to enhance the efficiency and reliability of system transmissions fully. By deploying ROMA panels at both the transmitter and receiver sides, and jointly optimizing the three-dimensional (3D) rotation angles of each ROMA panel and the relative positions of antenna elements based on the spatial distribution of users and channel state information (CSI), we can achieve the objective of maximizing the average spectral efficiency (SE). Subsequently, we conduct a detailed analysis of the average SE performance of the system under the consideration of maximum ratio (MR) precoding. Due to the non-convexity of the optimization problem in the ROMA multi-user MIMO system, we propose an efficient solution based on an alternating optimization (AO) algorithm. Finally, simulation results demonstrate that the AO-based ROMA architecture can significantly improve the average SE. Furthermore, the performance improvement becomes more pronounced as the movable region and the transmission power increase. © 2012 IEEE.

关键词： Spectrum efficiency

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Using Deep Reinforcement Learning in Optimal Energy Management for Residential House Aggregators with Uncertain User Behaviors

Using Deep Reinforcement Learning in Optimal Energy Manageme...

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IEEE Student Conference on Electric Machines and Systems

作者： Yujun Lin Linfang Yan Hongxun Hui Yin Chen Xia Chen Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid (Suzhou) City & Energy Research Institute Suzhou China Department of Electrical and Computer Engineering State Key Laboratory of Internet of Things for Smart City University of Macau Macau China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow U.K.

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

In this study, the home energy management problem, which can be regarded as a high-dimensional optimization problem, for numerous residential houses, is addressed. The concept of the aggregator is utilized to reduce the state and action space and to handle the high dimensionality. A two-stage deep reinforcement learning (DRL)-based approach is proposed for the aggregators to track the schedule from a superior grid and guarantee the operation constraints. In the first stage, a DRL control agent is set to learn the optimal scheduling strategy interacting with the environment based on the soft-actor-critic framework and generate the aggregate control actions. In the second stage, the aggregate control actions are disaggregated to individual appliances considering the users' behaviors. The uncertainty of an electric vehicle's charging demand is quantitatively expressed based on the driver's experience. An aggregate anxiety concept is introduced to characterize the driver's anxiety on the electric vehicle's range and uncertain events. Finally, simulations are conducted to verify the effectiveness of the proposed approach under dynamic user behaviors, and comparisons show the superiority of the proposed approach over other benchmark methods.

关键词： Schedules Uncertainty Aggregates Anxiety disorders Optimal scheduling Deep reinforcement learning Electric vehicle charging Temperature control Vehicle dynamics Resistance heating

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FIRST-PRINCIPLES STUDY ON ADSORPTION REACTION OF OXYGEN MOLECULES ON FE (110) CRYSTAL SURFACE 29

FIRST-PRINCIPLES STUDY ON ADSORPTION REACTION OF OXYGEN MOLE...

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2022 29th International Conference on Nuclear engineering, ICONE 2022

作者： Xiaochuan, Zeng Xuejun, Li Cuizhu, He Qiaodan, Hu State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co. Ltd Shenzhen China Institution of advanced materials and solidification Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9780791886472

The adsorption reaction between oxygen (O2) molecule and ferrum (Fe) (110) crystal surface in the oxidation process of Fe surface was studied by using the first-principles method. The differential charge density analysis of the adsorption sites of oxygen molecule on Fe (110) crystal surface, the calculation of adsorption energy at different sites and the analysis of electronic density of states showed that the stable adsorption position of oxygen molecule was parallel to Fe (110) crystal surface, and the oxygen atom tended to adsorb at the triangular gap of Fe atoms. The electronic structure of the adsorption system showed that the 2p electron orbital of oxygen atom plays a major role in the adsorption, and only O-Fe electron interaction exists when oxygen molecule is adsorbed in the parallel orientation, which makes the whole Fe (110) crystal surface lose electrons, increase the system potential and the risk of electrochemical corrosion. The research conclusions can provide theoretical support for the further insight in the oxidation corrosion mechanism of nuclear metal surface. Copyright © 2022 by ASME.

关键词： Electronic structure

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Magnet Design of a 5MW Liqhysmes

Magnet Design of a 5MW Liqhysmes

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Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Li Li Meng Song Zhixing Yang Li Ren Ying Xu Jiakun Fang Chuang Wang Yifeng Qiu Joint Laboratory on Power Superconducting Technology China Southern Power Grid Company Ltd Guangzhou China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

LIQHYSMES (combination of LIQuid HYdrogen and SMES) has the advantages of superconducting magnetic energy storage and hydrogen energy storage, which can solve the power imbalance problem caused by the output fluctuation of renewable energy because of grid connection. Superconducting magnet is the core component of the system. In this paper, the 5MW LIQHYSMES magnet is taken as the research object, and the total amount of superconducting tapes used by the magnet is taken as the optimization objective. By using COMSOL software and MATLAB software, the optimal economic design scheme of the superconducting magnet was obtained by genetic algorithm.

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A review of CoSb_(3)-based skutterudite thermoelectric materials

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Journal of advanced Ceramics 2020年第6期9卷 647-673页

作者： Zhi-Yuan LIU Jiang-Long ZHU Xin TONG Shuo NIU Wen-Yu ZHAO School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The binary skutterudite CoSb_(3) is a narrow bandgap semiconductor thermoelectric(TE)material with a relatively flat band structure and excellent electrical ***,thermal conductivity is very high because of the covalent bond between Co and Sb,resulting in a very low ZT ***,researchers have been trying to reduce its thermal conductivity by the different optimization *** addition,the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb_(3) material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering *** review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb_(3)-based materials at atomic-molecular scale and nano-mesoscopic *** also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb_(3)-based materials and synergistic optimization of the electrical and thermal transport *** addition,the research progress of CoSb_(3)-based TE devices in recent years is also briefly discussed.

关键词： skutterudite CoSb_(3)-based materials lattice thermal conductivity synergistic optimization thermoelectric properties thermoelectric devices

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Development of a Two-Phase Flow Solver with Drift-Flux Model Based on Openfoam: Validation Against Single/Two-Phase and Boiling Flow

SSRN

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SSRN 2024年

作者： Wu, Wenqiang Zhang, Dalin Huang, Tao Du, Peng Zhou, Lei Wang, Bo Deng, Jian Qiu, Zhifang Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China

Based on the open-source platform OpenFOAM, this paper implements a two-phase flow solver for drift flux models with realistic closure relations. The solver inherits the numerical method from the OpenFOAM framework, adopts the PIMPLE algorithm, and follows its discrete and matrix-solving criteria, focusing on developing a two-phase flow model and constitutive models. The drift velocity model is based on Ishii and his collaborators’ work. The remaining models, such as wall friction, wall heat transfer, interfacial heat and mass transfer, are taken from TRACE Theory Manual. To fulfill the condition of conjugate heat transfer between fluid and solid, a virtual solid heat transfer function is developed under the premise of a single-domain solver. Extensive and successful validation has been conducted involving single-phase, two-phase, and boiling flow heat transfer phenomena by comparing with experimental data or typical system codes, and the two-phase flow solver's success has been demonstrated in several aspects. © 2024, The Authors. All rights reserved.

关键词： Two phase flow

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Experiment and Numerical Simulation on Seepage of Nuclear Grade Graphite Ig110

SSRN

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SSRN 2024年

作者： Peng, Lei Zhang, Shen Zhang, Huang Zhao, Jianlin Jiang, Ke Zheng, Wei Du, Bin Yin, Huaqiang He, Xuedong Ma, Tao Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing China College of Petroleum Engineering China University of Petroleum Beijing China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Sichuan Chengdu China

Nuclear-grade graphite is extensively utilized in the High Temperature Gas-cooled Reactor’s core. It holds significant importance to estimate the permeability of nuclear grade graphite accurately for dehumidification purposes. Through the utilization of high-resolution X-ray microtomographic image (XCT-image), three-dimensional geometries of nuclear graphite IG-110 were generated. Subsequently, a combination of a single relaxation time lattice Boltzmann method (SRT-LBM) and an analytical model is used for analyzing gas permeabilities based on XCT-image. The results showed that these numerical approaches can over‐estimate permeability by a magnification of four or more for nuclear graphite compared to experiment results, as reported in this study. This work can deepen the understanding of microscopic flow characteristics of water vapor and provide a reference data for dehumidification process. © 2024, The Authors. All rights reserved.

关键词： Graphite

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