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High transparency Pr:Y_(2)O_(3) ceramics:A promising gain medium for red emission solid-state lasers

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Journal of Advanced Ceramics 2022年第6期11卷 874-881页

作者： qing LI Ying wang Jun wang Jie MA Meng ni Hui LIN Jian ZHANG Peng LIU Xiaodong XU Dingyuan TANG Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China school of electrical and electronic engineering Nanyang Technological UniversitySingapore 639798Singapore engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai institute of Ceramics Chinese Academy of SciencesShanghai 201899China

Highly transparent 0.5 and 1.0 at%Pr-doped Y_(2)O_(3)ceramics were fabricated by vacuum sintering plus hot isostatic pressing(HIP)*** selection of suitable pre-sintering temperatures and right microstructures before HIP was critical to obtain high density of the final sintered *** well-densified ceramics had pore-free microstructures with an average grain size of about 1μ*** was also found that the charge states of the Pr ions could be changed through regulating the annealing atmospheres,resulting in different absorption and emission characteristics in the visible wavelength *** in reducing atmosphere(5%H_(2)/95%Ar)favored the formation of Pr^(3+),resulting in stronger red emissions,while annealing in oxygen atmosphere led to the rise of lattice constant due to the concentration increase of oxygen *** H_(2)/Ar-annealed 0.5 at%Pr:Y_(2)O_(3)ceramics exhibited strong red emission at 600–675 nm,which may be a promising gain material for red solid-state lasers.

关键词： praseodymium ions(Pr3+) Y_(2)O_(3)ceramic valence state defect state optical properties

Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

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Chinese Physics Letters 2024年第5期41卷 47-52页

作者：石鹏庄革程芝峰高丽周乙楠刘永罗景庭李景春 institute of Plasma Physics Chinese Academy of SciencesHefei 230031China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of engineering and Applied Physics school of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640China

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion. This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG) and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT *** ITG mode is characterized by frequencies ranging from 30 to 100 k Hz and wavenumbers(k_(θρs)) less than 0.3. Beyond a critical plasma density threshold, the ITG mode undergoes a bifurcation, which is marked by a reduction in frequency and an enhancement in amplitude. Concurrently, enhancements in ion energy loss and degradation in confinement are observed. This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

关键词： ITG mode collective

高职院校创新创业育人育才培养机制的研究与探析

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教育教学论坛 2024年第23期 101-104页

作者：侯志伟杜青青包理群兰州石化职业技术大学电子电气工程学院甘肃兰州730060 兰州工业学院电子信息工程学院甘肃兰州730050

立足我国经济结构战略转型的时代背景,梳理分析高职院校创新创业教育的重要意义及人才培养现状,围绕解决创新创业教育培养什么人和如何培养人的核心问题,以校企合作、专创并育、产教融合、课程体系、育训结合、技能大赛、创新创业、平... 详细信息

立足我国经济结构战略转型的时代背景,梳理分析高职院校创新创业教育的重要意义及人才培养现状,围绕解决创新创业教育培养什么人和如何培养人的核心问题,以校企合作、专创并育、产教融合、课程体系、育训结合、技能大赛、创新创业、平台载体为抓手,以价值观塑造、知识传授、能力培养为目标,加强职业教育创新创业能力提升的顶层设计,形成全过程、全方位的注重创新、促进创业的育人育才培养机制,进一步健全、完善、丰富职业教育生态系统。

关键词：高职院校创新创业育人育才培养机制

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磷酸铁锂的高性能化研究进展

现代技术陶瓷 2024年第1期45卷 74-99页

作者：王延壮程仁飞杨金星王晓辉中国科学院金属研究所沈阳材料科学国家研究中心沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016

工业革命以来,科技的迅速发展不断丰富着人类的物质生活,与此同时化石能源(石油、煤炭、天然气等)大量消耗,二氧化碳排放逐年增加,全球变暖趋势加剧。燃油汽车是石油消耗的主力军。为落实“双碳”战略目标,新能源汽车发展迅猛。作为新... 详细信息

工业革命以来,科技的迅速发展不断丰富着人类的物质生活,与此同时化石能源(石油、煤炭、天然气等)大量消耗,二氧化碳排放逐年增加,全球变暖趋势加剧。燃油汽车是石油消耗的主力军。为落实“双碳”战略目标,新能源汽车发展迅猛。作为新能源汽车的动力来源,动力电池备受关注。开发价格低廉、资源丰富、安全性优异的动力电池是发展新能源汽车的重中之重。目前磷酸铁锂(LiFePO_(4))和三元正极材料广泛用作混合动力汽车(Hybrid electrical Vehicle,HEV)和电动汽车(electrical Vehicle,EV)锂离子电池中。前几年,受国家补贴政策影响,由于能量密度比三元正极材料低,LiFePO_(4)正极材料的出货量几乎停止增长,而三元正极材料一路高歌猛进,占据了新能源汽车的主要市场。随着补贴政策的退出,具有橄榄石结构的LiFePO_(4)因其具有成本低、安全性高、环境友好等诸多优点又重新获得青睐。同时,由于刀片电池等结构设计上的技术进步,LiFePO_(4)电池的能量密度大幅提高。2021年LiFePO_(4)正极材料的出货量超过三元正极材料,达到47万吨。然而,LiFePO_(4)较低的电子电导率(<10^(-9)S cm^(-1))和Li+离子扩散系数(10^(-14)cm^(2)s^(-1)~10^(-16)cm^(2)s^(-1)),严重阻碍了其在动力电池领域的进一步扩展。基于市场对新能源汽车快速充放电的现实需要,提升LiFePO_(4)的电化学性能刻不容缓。目前的策略主要包括通过改善合成条件控制晶体的尺寸和取向、表面包覆、掺杂、缺陷控制等。本文从锂离子电池的组成及工作原理出发,结合LiFePO_(4)的晶体结构特征和充放电机制,深入探讨了LiFePO_(4)高性能化的研究进展,并提出了LiFePO_(4)未来的研究方向和发展趋势。

关键词： LiFePO_(4) 制备表面包覆掺杂

Purification of copper foils driven by single crystallization

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Chinese Physics B 2024年第2期33卷 506-511页

作者：寇金宗赵孟泽李兴光何梦林杨方友刘科海成庆秋任云龙刘灿付莹吴慕鸿刘开辉王恩哥 Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Guangdong Provincial Key Laboratory of Quantum engineering and Quantum Materials School of PhysicsSouth China Normal UniversityGuangzhou 510006China Guangdong–Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Department of PhysicsRenmin University of ChinaBeijing 100872China International Center for Quantum Materials Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China school of Physics Liaoning UniversityShenyang 110036China

High-purity copper(Cu) with excellent thermal and electrical conductivity, is crucial in modern technological applications, including heat exchangers, integrated circuits, and superconducting magnets. The current purification process is mainly based on the zone/electrolytic refining or anion exchange, however, which excessively relies on specific integrated equipment with ultra-high vacuum or chemical solution environment, and is also bothered by external contaminants and energy consumption. Here we report a simple approach to purify the Cu foils from 99.9%(3N) to 99.99%(4N) by a temperature-gradient thermal annealing technique, accompanied by the kinetic evolution of single crystallization of *** success of purification mainly relies on(i) the segregation of elements with low effective distribution coefficient driven by grain-boundary movements and(ii) the high-temperature evaporation of elements with high saturated vapor *** purified Cu foils display higher flexibility(elongation of 70%) and electrical conductivity(104% IACS) than that of the original commercial rolled Cu foils(elongation of 10%, electrical conductivity of ~ 100% IACS). Our results provide an effective strategy to optimize the as-produced metal medium, and therefore will facilitate the potential applications of Cu foils in precision electronic products and high-frequency printed circuit boards.

关键词： purification copper foil thermal annealing technique single crystallization

TXV technology:The cornerstone of 3D system-in-packaging

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Science china(Technological Sciences) 2022年第9期65卷 2031-2050页

作者： ZHAO HeRan CHEN MingXiang PENG Yang wang qing KANG Min CAO LiHua school of Mechanical Science and engineering Huazhong University of Science and TechnologyWuhan 430074China The 47th institute of china electronics technology Group Corporation Shenyang 110000China State Key Laboratory of Digital Manufacturing Equipment and technology Huazhong University of Science and TechnologyWuhan 430074China school of Aerospace engineering Huazhong University of Science and TechnologyWuhan 430074China institute of Metal Research Chinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Shenyang 110016China

System-in-packaging(Si P) can realize the integration and miniaturization of electronic devices and it is significant to continue Moore’s ***-X-via(TXV) technology is the cornerstone of 3 D-SiP,which enables the vertical stacking and electrical interconnection of electronic *** originated from through-hole(TH) in PCB substrates and evolved in different substrate materials,such as silicon,glass,ceramic,and *** work provides a comprehensive review of four distinguishing TXV technologies(through silicon via(TSV),through glass via(TGV),through ceramic via(TCV),and through mold via(TMV)),including the fabrication mechanisms,processes,and *** TXV technology has unique characteristics and owns particular processes and *** process methods,key technologies,application fields,and advantages and disadvantages of each TXV technology were *** cutting-edge through-hole process and development direction were reviewed.

关键词： through silicon via(TSV) through ceramic via(TCV) through glass via(TGV) through mold via(TMV) 3D packaging chip stacking interposer

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差分编码辅助的机器学习CSI反馈方法

电子信息对抗技术 2024年第2期39卷 64-71页

作者：卿朝进刘文慧刘宇畅叶青王子龙陈金良西华大学电气与电子信息学院成都610039 中国电子科技集团公司第二十九研究所成都610036 西华大学航空航天学院成都610039

在大规模多输入多输出(massive Multiple Input Multiple Output,mMIMO)系统中,信道状态信息(Channel State Information,CSI)反馈严重占用上行带宽资源。为此,提出差分编码辅助的机器学习CSI反馈,探索节省上行带宽资源,减小用户设备(Us... 详细信息

在大规模多输入多输出(massive Multiple Input Multiple Output,mMIMO)系统中,信道状态信息(Channel State Information,CSI)反馈严重占用上行带宽资源。为此,提出差分编码辅助的机器学习CSI反馈,探索节省上行带宽资源,减小用户设备(User Equipment,UE)能量开销的途径。在UE端,通过差分编码方式反馈CSI,避免UE端发送用于上行信道估计的导引,从而减小上行带宽资源占用,并节省UE能量开销。在基站(Base Station,BS)端,首先对接收信号进行差分译码,随后构建轻量化神经网络恢复下行CSI。仿真结果表明,相对于上行导引信道估计的CSI反馈,所研究的差分编码辅助的机器学习CSI反馈方法在节省上行带宽资源、减小UE能量消耗的同时,提高了下行CSI的重构精度。

关键词： CSI 差分编码带宽资源能量消耗

Insights into layered-tunnel dynamic structural evolution based on local coordination chemistry regulation for high-energy-density and long-cycle-life sodium-ion oxide cathodes

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InfoMat 2023年第10期5卷 32-42页

作者： Yao Xiao Yi-Feng Liu Hong-wei Li Jia-Yang Li Jing-Qiang wang Hai-Yan Hu Yu Su zhuang-Chun Jian Hu-Rong Yao Shuang-Qiang Chen Xian-Xiang Zeng Xiong-wei Wu Jia-Zhao wang Yan-Fang Zhu Shi-Xue Dou Shu-Lei Chou institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouthe People's Republic of China Wenzhou Key Laboratory of Sodium-Ion Batteries Wenzhou University Technology Innovation Institute for Carbon NeutralizationWenzhouthe People's Republic of China State Key Laboratory of electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anthe People'sRepublic of China school of Chemistry and Materials Science Hunan Agricultural UniversityChangshathe People's Republic of China institute for Superconducting and electronic Materials Australian Institute for Innovative Materials University of Wollongong Innovation CampusNorth WollongongNew South WalesAustralia Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhouthe People's Republic of China

The pursuit of high energy density while achieving long cycle life remains a challenge in developing transition metal(TM)oxide cathode materials for sodium-ion batteries(SIBs).Here,we present a concept of precisely manipulating structural evolution via local coordination chemistry regulation to design high-performance composite cathode *** controllable structural evolution process is realized by tuning magnesium content in Na0.6Mn1-xMgxO2,which is elucidated by a combination of experimental analysis and theoretical *** substitution of Mg into Mn sites not only induces a unique structural evolu-tion from layered–tunnel structure to layered structure but also mitigates the Jahn–Teller distortion of Mn3+.Meanwhile,benefiting from the strong ionic inter-action between Mg2+and O2-,local environments around O2-coordinated with electrochemically inactive Mg2+are anchored in the TM layer,providing a pinning effect to stabilize crystal structure and smooth electrochemical *** layered–tunnel Na0.6Mn0.95Mg0.05O2 cathode material delivers 188.9 mAh g-1 of specific capacity,equivalent to 508.0 Wh kg-1 of energy density at 0.5C,and exhibits 71.3%of capacity retention after 1000 cycles at 5C as well as excellent compatibility with hard carbon *** work may provide new insights of manipulating structural evolution in composite cathode materials via local coordi-nation chemistry regulation and inspire more novel design of high-performance SIB cathode materials.

关键词： dynamic structural evolution high-energy-density layered-tunnel structure local coordination chemistry sodium-ion oxide cathodes

Structural plasticity-based hydrogel optical Willshaw model for one-shot on-the-fly edge learning

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InfoMat 2023年第4期5卷 48-59页

作者： Dingchen wang Dingyao Liu Yinan Lin Anran Yuan Woyu Zhang Yaping Zhao Shaocong wang Xi Chen Hegan Chen Yi Zhang Yang Jiang Shuhui Shi Kam Chi Loong Jia Chen Songrui wei qing wang Hongyu Yu Renjing Xu Dashan Shang Han Zhang Shiming Zhang Zhongrui wang Department of electrical and electronic engineering The University of Hong KongHong Kongthe People's Republic of China ACCESS-AI Chip Center for Emerging Smart Systems InnoHK CentersHong Kong Science ParkHong Kongthe People's Republic of China school of Computer Science and engineering Faculty of Innovation EngineeringMacao University of Science and TechnologyMacaothe People's Republic of China Key Laboratory of Microelectronics Devices and Integrated technology Institute of MicroelectronicsChinese Academy of SciencesBeijingthe People's Republic of China Collaborative Innovation Center for Optoelectronic Science technology International Collaborative Laboratory of 2D Materials for OptoelectronicsScience and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhenthe People's Republic of China school of Microelectronics Southern University of Science and TechnologyShenzhenthe People's Republic of China Microelectronics Thrust Function Hub of the Hong Kong University of Science and Technology(Guangzhou)Guagndongthe People's Republic of China

Autonomous one-shot on-the-fly learning copes with the high privacy,small dataset,and in-stream data at the *** such learning on digital hardware suffers from the well-known von-Neumann and scaling *** optical neural networks featuring large parallelism,low latency,and high efficiency offer a promising ***,ex-situ training of conventional optical networks,where optical path configuration and deep learning model optimization are separated,incurs hardware,energy and time overheads,and defeats the advantages in edge ***,we introduced a bio-inspired material-algorithm co-design to construct a hydrogel-based optical Willshaw model(HOWM),manifesting Hebbian-rule-based structural plasticity for simultaneous optical path configuration and deep learning model optimization thanks to the underlying opto-chemical *** first employed the HOWM as an all optical in-sensor AI processor for one-shot pattern classification,association and *** then leveraged HOWM to function as a ternary content addressable memory(TCAM)of an optical memory augmented neural network(MANN)for one-shot learning the Omniglot *** HOWM empowered one-shot on-the-fly edge learning leads to 1000boost of energy efficiency and 10boost of speed,which paves the way for the next-generation autonomous,efficient,and affordable smart edge systems.

关键词： associative memory hydrogel one-shot learning optical neural network structural plasticity Willshaw model