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Recent advances in fabrication and functions of neuromorphic system based on organic field effect transistor

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International Journal of Extreme Manufacturing 2024年第2期6卷 273-295页

作者： Yaqian Liu Minrui Lian Wei chen Huipeng chen School of Physics and Electronic Engineering Zhengzhou University of Light IndustryHenan 450002People’s Republic of China Institute of Optoelectronic Display National&Local United Engineering Lab of Flat Panel Display TechnologyFuzhou UniversityFuzhou 350002People’s Republic of China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207People’s Republic of China Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore Department of Physics National University of Singapore3 Science Drive 3Singapore 117543Singapore

The development of various artificial electronics and machines would explosively increase the amount of information and data,which need to be processed via in-situ *** synapse devices can store and process signals in a parallel way,thus improving fault tolerance and decreasing the power consumption of artificial *** organic field effect transistor(OFET)is a promising component for bioinspired neuromorphic systems because it is suitable for large-scale integrated circuits and flexible *** this review,the organic semiconductor materials,structures and fabrication,and different artificial sensory perception systems functions based on neuromorphic OFET devices are ***,a summary and challenges of neuromorphic OFET devices are *** review presents a detailed introduction to the recent progress of neuromorphic OFET devices from semiconductor materials to perception systems,which would serve as a reference for the development of neuromorphic systems in future bioinspired electronics.

关键词： organic field effect transistor neuromorphic systems synaptic transistor sensory perception systems device fabrication

高分辨率光学卫星点目标成像轨道测量数据处理方法

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测绘地理信息 2024年第4期49卷 1-6页

作者：王密陈俊博金淑英武汉大学测绘遥感信息工程国家重点实验室

随着卫星技术的飞速发展，光学遥感卫星具备了在一个轨道弧段内对多点目标成像的能力。对光学遥感卫星而言，一般通过构建严密几何成像模型来实现影像的高精度几何定位，该过程需要获取每一成像行所对应的轨道数据。然而卫星在对点目标... 详细信息

随着卫星技术的飞速发展，光学遥感卫星具备了在一个轨道弧段内对多点目标成像的能力。对光学遥感卫星而言，一般通过构建严密几何成像模型来实现影像的高精度几何定位，该过程需要获取每一成像行所对应的轨道数据。然而卫星在对点目标成像时，轨道观测值不足导致难以获取每一成像行的轨道数据。本文提出了一种基于简化普适摄动模型的单点轨道数据处理方法，由卫星的位置速度结合SGP4模型生成两行根数，从而为每一成像行提供轨道数据，进一步完成影像的几何定位。实验结果表明该方法的轨道处理精度高，几何定位结果可靠，精度与标准影像产品几何定位精度基本相当，对于光学遥感卫星的影像处理具有一定的意义。另外，使用STK软件生成的仿真轨道数据进行实验表明，本文方法对于轨道倾角适中的卫星，其数据处理的精度相对较高。

关键词：轨道数据处理两行根数轨道倾角

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Fe-N_(x) sites coupled with core-shell FeS@C nanoparticles to boost the oxygen catalysis for rechargeable Zn-air batteries

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Journal of Energy Chemistry 2024年第3期90卷 565-577,I0013页

作者： Katam Srinivas Zhuo chen Anran chen Fei Ma Ming-qiang Zhu Yuanfu chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina

The development of efficient single-atom catalysts(SACs) for the oxygen reduction reaction(ORR)remains a formidable challenge,primarily due to the symmetric charge distribution of metal singleatom sites(M-N_(4)).To address such issue,herein,Fe-N_(x) sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution,thus enhancing the intrinsic catalytic ***,atomically dispersed Fe-N_(x) sites supported on N/S-doped mesoporous carbon(NSC)coupled with FeS@C core-shell nanoparticles(FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent *** to the presence of an in situ-grown conductive graphitic layer(shell),the FeS nanoparticles(core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling ***,FAS-NSC@950displays a more positive half-wave potential(E_(1/2)) of 0.871 V with a significantly boosted ORR kinetics(Tafel slope=52.2 mV dec^(-1)),outpacing the commercial Pt/C(E_(1/2)=0.84 V and Tafel slope=54.6 mV dec^(-1)).As a bifunctional electrocatalyst,it displays a smaller bifunctional activity parameter(ΔE) of 0.673 V,surpassing the Pt/C-RuO_(2) combination(ΔE=0.724 V).Besides,the FAS-NSC@950-based zincair battery(ZAB) displays superior power density,specific capacity,and long-term cycling performance to the Pt/C-Ir/C-based *** work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR,with potential implications for energy conversion and storage technologies.

关键词： Fe-N_(x)sites Core-shell FeS@C Synergistic interactions Oxygen reduction reaction Zn-air battery

Global intensification of weak tropical cyclones in the past 30 years

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Science China Earth Sciences 2024年第2期67卷 639-640页

作者： Dake chen State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000Chin

The response of tropical cyclones(TCs)to climate change is a hot topic in ocean and atmosphere *** theoretical analysis and numerical experiments indicated that the intensity of TCs may increase with global warming(Emanuel,1987;Knutson and Tuleya,2004),which however has not been convincingly validated by presently available observations(Landsea,2005;Pielke,2005).Using a huge amount of global ocean surface drifter data,Wang et al.

关键词： tropical ocean cyclones

Breakthrough in room-temperature plastic ceramic

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Science China Materials 2024年第6期67卷 2042-2044页

作者： Lidong chen State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Centre of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The pursuit of structural materials that embody both high strength and significant plastic deformability is pivotal to ensuring safety and reliability across diverse ***,achieving this dual characteristic within a single material has long posed a formidable challenge in the realm of materials ***,renowned for their excellent plasticity facilitated by the delocalization of valence electrons.

关键词： strength ceramic pursuit

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肺康复训练用于慢性阻塞性肺疾病缓解期的效果观察

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中国基层医药 2021年第2期28卷 309-311页

作者：陈舒盈义乌市中心医院呼吸一科浙江省322000

目的观察肺康复训练护理用于慢性阻塞性肺疾病(COPD)缓解期患者的临床效果。方法选取义乌市中心医院2017年5月至2018年4月收治的COPD缓解期患者64例为研究对象,采用随机数字表法分为对照组、观察组各32例。对照组采用常规护理,观察组在... 详细信息

目的观察肺康复训练护理用于慢性阻塞性肺疾病(COPD)缓解期患者的临床效果。方法选取义乌市中心医院2017年5月至2018年4月收治的COPD缓解期患者64例为研究对象,采用随机数字表法分为对照组、观察组各32例。对照组采用常规护理,观察组在常规护理基础上辅以肺康复训练护理。比较两组患者的肺功能、慢性阻塞性肺疾病评估测试量表(CAT)评分、改良英国医学研究学会呼吸困难指数(mMRC)评分、6 min步行距离(6MWD)及护理满意度。结果护理干预后,观察组第一秒用力呼气量(FEV1)、用力肺活量(FVC)、第一秒用力呼气量占用力肺活量比值(FEV1/FVC)、6MWD、护理满意度评分分别为(1.77±0.66)L、(2.72±0.50)L、(74.26±10.74)%、(434.66±58.54)m、(95.37±3.16)分,均显著高于对照组的(1.48±0.43)L、(2.31±0.26)L、(67.05±12.33)%、(384.71±56.20)m、(83.45±3.20)分,差异均有统计学意义(t=2.083、4.115、2.494、3.482、14.993,均P<0.05);观察组CAT评分(12.45±3.70)分、mMRC评分(1.34±0.56)分,均明显低于对照组的(16.02±4.36)分、(2.10±0.70)分,差异均有统计学意义(t=3.532、4.796,均P<0.05)。结论肺康复训练护理用于COPD缓解期患者的效果满意,有助于改善患者的肺功能及呼吸功能。

关键词：肺疾病,慢性阻塞性肺康复护理用力呼气量肺活量肺功能呼吸功能试验病人满意度

Eigenstate properties of the disordered Bose-Hubbard chain

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Frontiers of physics 2024年第4期19卷 57-72页

作者： Jie chen Chun chen Xiaoqun Wang Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Physics Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Many-body localization(MBL)of a disordered interacting boson system in one dimension is studied numerically at the filling faction *** von Neumann entanglement entropy Svn is commonly used to detect the MBL phase transition but remains challenging to be directly *** on the U(1)symmetry from the particle number conservation,Svn can be decomposed into the particle number entropy S_(n) and the configuration entropy *** light of the tendency that the eigenstate's S_(c) nears zero in the localized phase,we introduce a quantity describing the deviation of S from the ideal thermalization distribution;finite-size scaling analysis illustrates that it shares the same phase transition point with Sv but displays the better critical *** observation hints that the phase transition to MBL might largely be determined by S and its fluctuations Notably,the recent experiments[***,et al.,Science 364,256(2019);***,et al.,***.19,481(2023)]demonstrated that this deviation can potentially be measured through the Sn ***,our investigations reveal that the thermalized states primarily occupy the low-energy section of the spectrum,as indicated by measures of localization length,gap ratio,and energy density *** low-energy spectrum of the Bose model closely resembles the entire spectrum of the Fermi(or spin XXZ)model,accommodating a transition from the thermalized to the localized ***,owing to the bosonic statistics,the high-energy spectrum of the model allows the formation of distinct clusters of bosons in the random potential *** analyze the resulting eigenstate properties and briefly summarize the associated *** distinguish between the phase regions at the low and high energies,a probing quantity based on the structure of S_(VN) is also *** work highlights the importance of symmetry combined with entanglement in the study of *** this regard,for the disordered Heisenberg XXZ

关键词： entanglement entropy decomposition U(1)symmetry thermalization-to-localization transition

GENERALIZED JACOBI SPECTRAL GALERKIN METHOD FOR FRACTIONAL-ORDER VOLTERRA INTEGRO-DIFFERENTIAL EQUATIONS WITH WEAKLY SINGULAR KERNELS

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Journal of Computational Mathematics 2024年第2期42卷 355-371页

作者： Yanping chen Zhenrong chen Yunqing Huang School of Mathematical Sciences South China Normal UniversityGuangzhou 510631China Hunan Key Laboratory for Computation and Simulation in Science and Engineering Xiangtan UniversityXiangtan 411105China

For fractional Volterra integro-differential equations(FVIDEs)with weakly singular kernels,this paper proposes a generalized Jacobi spectral Galerkin *** basis functions for the provided method are selected generalized Jacobi functions(GJFs),which can be utilized as natural basis functions of spectral methods for weakly singular FVIDEs when appropriately *** developed method's spectral rate of convergence is determined using the L^(∞)-norm and the weighted L^(2)-*** results indicate the usefulness of the proposed method.

关键词： Generalized Jacobi spectral Galerkin method Fractional-order Volterra integ-ro-differential equations Weakly singular kernels Convergence analysis

Cr13Ni4Mo钢逆转变奥氏体的形成及其对性能的影响

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金属热处理 2023年第1期48卷 95-100页

作者：赵帅李青春安昊瀛陈淑英常国威辽宁工业大学材料科学与工程学院辽宁锦州121001 西安理工大学材料科学与工程学院陕西西安710048

采用XRD、扫描电镜、EBSD、拉伸性能测试等手段研究了Cr13Ni4Mo钢逆转变奥氏体的形成规律、形成机制与力学性能。结果表明,Cr13Ni4Mo钢经550~730℃一次回火后并没有逆转变奥氏体产生;经630℃一次回火+530~630℃二次回火时,随二次回火温... 详细信息

采用XRD、扫描电镜、EBSD、拉伸性能测试等手段研究了Cr13Ni4Mo钢逆转变奥氏体的形成规律、形成机制与力学性能。结果表明,Cr13Ni4Mo钢经550~730℃一次回火后并没有逆转变奥氏体产生;经630℃一次回火+530~630℃二次回火时,随二次回火温度的升高,逆转变奥氏体含量呈先增加后减少的趋势,其抗拉强度、伸长率和强塑积也相应地先增加后减少。当二次回火温度为590℃时,逆转变奥氏体的含量达到峰值,综合力学性能最佳。二次回火温度为550℃时,逆转变奥氏体主要以切变机制在马氏体板条内部形成,随着二次回火温度升高,逆转变奥氏体逐渐以扩散机制形成为主。

关键词：逆转变奥氏体二次回火 Cr13Ni4Mo钢