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Electronic synapses based on ultrathin quasi-two-dimensional gallium oxide memristor

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Chinese Physics B 2019年第1期28卷 183-188页

作者： Shuopei Wang congli he Jian Tang Rong Yang Dongxia Shi Guangyu Zhang CAS Key Laboratory of Nanoscale Physics and DevicesBeijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190China Institute of Advanced Materials Beijing Normal University Beijing 100875China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Synapse emulation is very important for realizing neuromorphic computing, which could overcome the energy and throughput limitations of today's computing architectures. Memristors have been extensively studied for using in nonvolatile memory storage and neuromorphic computing. In this paper, we report the fabrication of vertical sandwiched memristor device using ultrathin quasi-two-dimensional gallium oxide produced by squeegee method. The as-fabricated two-terminal memristor device exhibited the essential functions of biological synapses, such as depression and potentiation of synaptic weight, transition from short time memory to long time memory, spike-timing-dependent plasticity, and spike-rate-dependent plasticity. The synaptic weight of the memristor could be tuned by the applied voltage pulse, number,width, and frequency. We believe that the injection of the top Ag cations should play a significant role for the memristor phenomenon. The ultrathin of medium layer represents an advance to integration in vertical direction for future applications and our results provide an alternative way to fabricate synaptic devices.

关键词： gallium oxide memristor artificial synapse synaptic plasticity

Enhanced spin–orbit torque efficiency in Pt100−xNix alloy based magnetic bilayer

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Chinese Physics B 2021年第3期30卷 100-104页

作者： congli he Qingqiang Chen Shipeng Shen Jinwu Wei Hongjun Xu Yunchi Zhao Guoqiang Yu Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The binary alloy/ferromagnetic metal heterostructure has drawn extensive attention in the research field of spin–orbittorque(SOT)due to the potential enhancement of SOT efficiency via composition *** this work,the magneticproperties and SOT efficiency in the Pt100−xNix/Ni78Fe22 bilayers were investigated via the spin-torque ferromagneticresonance(ST-FMR)*** effective magnetic anisotropy field and effective damping constant extracted by analyzing the ST-FMR spectra show a weak dependence on the Ni *** effective spin-mixing conductanceof 8.40×10^(14)Ω−1·m−2and the interfacial spin transparency Tin of 0.59 were obtained for the sample of Pt70Ni30/*** interestingly,the SOT efficiency that is carefully extracted from the angular dependence of ST-FMR spectrashows a nonmonotonic dependence on the Ni concentration,which reaches the maximum at x=*** enhancement ofthe SOT efficiency by alloying the Ni with Pt shows potential in lowering the critical switching ***,alloyingrelatively cheaper Ni with Pt may promote to reduce the cost of SOT devices.

关键词： spin-orbit torque magnetic doping spin-torque ferromagnetic resonance

Gate-tunable large-scale flexible monolayer MoS_(2)devices for photodetectors and optoelectronic synapses

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Nano Research 2022年第6期15卷 5418-5424页

作者： Na Li congli he Qinqin Wang Jianshi Tang Qingtian Zhang Cheng Shen Jian Tang heyi Huang Shuopei Wang Jiawei Li Biying Huang Zheng Wei Yutuo Guo Jiahao Yuan Wei Yang Rong Yang Dongxia Shi Guangyu Zhang Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China School of Integrated Circuits Beijing Innovation Center for Future Chips(ICFC)Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China

Photodetectors and optoelectronic synapses are vital for construction of artificial visual perception ***,the hardware implementations of optoelectronic-neuromorphic devices based on conventional architecture usually suffer from poor scalability,light response range,and limited ***,large-scale flexible monolayer MoS_(2)devices integrating photodetectors and optoelectronic synapses over the entire visible spectrum in one device have been realized,which can be used in photodetection,optical communication,artificial visual perception system,and optical artificial neural *** modulating gate voltages,we enable MoS_(2)-based devices to be photodetectors and also optoelectronic ***,the MoS_(2)-based optoelectronic synapses could implement many synaptic functions and neuromorphic characteristics,such as short-term memory(STM),long-term memory(LTM),paired-pulse facilitation(PPF),long-term potentiation(LTP)/long-term depression(LTD),and“learning-experience”***,an associative learning behavior(the classical conditioning Pavlov’s dog experiment)was emulated using paired stimulation of optical and voltage *** results facilitate the development of MoS_(2)-based multifunctional optoelectronic devices with a simple device structure,showing great potential for photodetection,optoelectronic neuromorphic computing,human visual systems mimicking,as well as wearable and implantable electronics.

关键词： MoS_(2) flexible devices gate-tunable photodetector optoelectronic synapse

Non-volatile multi-state magnetic domain transformation in a Hall balance

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Chinese Physics B 2022年第6期31卷 120-124页

作者： Yang Gao Jingyan Zhang Pengwei Dou Zhuolin Li Zhaozhao Zhu Yaqin Guo Chaoqun Hu Weidu Qin congli he Shipeng Shen Ying Zhang Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Songshan Lake Materials Laboratory Dongguan 523808China

High performance of the generation,stabilization and manipulation of magnetic skyrmions prompts the application of topological multilayers in spintronic *** in synthetic antiferromagnets(SAF)have been considered as a promising alternative to overcome the limitations of ferromagnetic skyrmions,such as the skyrmion Hall effect and stray magnetic ***,by using the Lorentz transmission electron microscopy,the interconversion between the single domain,labyrinth domain and skyrmion state can be observed by the combined manipulation of electric current and magnetic field in a Hall balance(a SAF with the core structure of[Co/Pt]_(4)/NiO/[Co/Pt]_(4)showing perpendicular magnetic anisotropy).Furthermore,high-density room temperature skyrmions can be stabilized at zero field while the external stimulus is removed and the skyrmion density is *** generation and manipulation method of skyrmions in Hall balance in this study opens up a promising way to engineer SAF-skyrmion-based memory devices.

关键词： magnetic skyrmion Hall balance electromagnetic coordinated manipulation Lorentz transmission electron microscopy(LTEM)

Role of toll-like receptor 4/mutant myeloid differentiation primary response 88/nuclear factor kappa-B mediated inflammation in diabetes mellitus with Northwest dryness syndrome

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Journal of Traditional Chinese Medicine 2024年第5期44卷 963-973页

作者： DENG Deqiang XIAO Yan MA Dan QIU Jinling HAO congli WANG Di ZHANG Miao State Key Laboratory of Pathogenesis Prevention and Treatment of High Incidence Diseases in Central AsiaXinjiang Medical University Department of Endocrinology Traditional Chinese Medicine Hospital of Urumqi

OBJECTIVE: To investigate the role of toll-like receptor 4(TLR4)/mutant myeloid differentiation primary response 88(MyD88)/nuclear factor kappa-B(NF-κB) signaling pathway-mediated inflammation in diabetes mellitus with Northwest dryness ***: Rats were randomly divided into the normal control, type 2 diabetes(T2DM) model, Northwest dryness syndrome + T2DM(Northwest dryness), and simple internal dampness + T2DM(internal dampness)groups. Enzyme-linked immunosorbent assay was used to detect biochemical indexes and inflammatory *** histopathological observation was *** real-time polymerase chain reaction and Western blot analysis were used to detect the mRNA and protein expression levels, ***: Compared with the T2DM group, the glycosylated hemoglobin A1c, insulin, glucose tolerance,the homeostasis model assessment of insulin resistance,tumor necrosis factor-α, interleukin 1β, interleukin 16,malondialdehyde, blood lipid, alanine aminotransferase,and aspartate aminotransferase were significantly elevated in the internal dampness group. Their levels were significantly elevated in the Northwest dryness group than in the T2DM and internal dampness *** superoxide dismutase, glutathione peroxidase, liver glycogen, and organ-to-weight ratio were significantly declined in the internal dampness group and the Northwest dryness group than in the T2DM ***, these levels were elevated in the Northwest dryness group than in the internal dampness ***, the mRNA expression levels of interferon regulatory factor 5 and NF-κB p65, and the protein expression levels of TLR4, MyD88, and NF-κB were significantly higher in the internal dampness and the Northwest dryness groups than the T2DM ***, the mRNA and protein levels were significantly higher in the Northwest dryness group than in the internal dampness ***: Northwest dryness syndrome-mediated TLR4/MyD88/NF-κB pathway and chronic i

关键词： NF-kappa B Northwest dryness syndrome diabetes mellitus inflammation myeloid differentiation factor 88 toll-like receptor 4

“双碳”目标下黄河流域农业生态效率的动态演进与收敛特征

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西北农林科技大学学报（社会科学版） 2024年第3期24卷 149-160页

作者：何妮姚聪莉张畅西北大学公共管理学院西安710127 中共陕西省委党校(陕西行政学院)校刊编辑部西安710061

“双碳”目标下推进黄河流域农业生态效率提升,是推动实施黄河流域生态保护和高质量发展战略的重要途径。在农业减排固碳的发展要求下,以落实农业“双碳”目标为着力点,运用超效率SBM模型、Dagum基尼系数和收敛检验方法,测度2006-2021... 详细信息

“双碳”目标下推进黄河流域农业生态效率提升,是推动实施黄河流域生态保护和高质量发展战略的重要途径。在农业减排固碳的发展要求下,以落实农业“双碳”目标为着力点,运用超效率SBM模型、Dagum基尼系数和收敛检验方法,测度2006-2021年黄河流域农业生态效率的时序演进、空间差异和收敛特征。结果表明:黄河流域农业生态效率整体呈波动上升趋势,但整体农业生态效率水平偏低,形成了“下游领跑、中游追赶、上游落后”的空间格局;黄河流域内农业生态效率差异逐渐扩大,差异主要源自超变密度,区域内差异由低到高依次为上游、下游和中游;黄河流域整体及上、中、下游的农业生态效率不存在σ收敛现象,但都存在显著的β绝对收敛和β条件收敛,种植业产值、机械化水平、农业产业集聚度、产业结构高级化水平等因素对β条件收敛的影响具有异质性。

关键词：农业生态效率黄河流域碳达峰碳中和动态演进收敛特征

Autocatalytic reduction-assisted synthesis of segmented porous PtTe nanochains for enhancing methanol oxidation reaction

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Nano Research Energy 2023年第1期2卷 140-147页

作者： Qiqi Zhang Tianyu Xia he Huang Jialong Liu Mengyuan Zhu Hao Yu Weifeng Xu Yuping Huo congli he Shipeng Shen Cong Lu Rongming Wang Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China Key Laboratory of Materials Physics of the Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Electronics School of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China Synchrotron Radiation Research Center Hyogo Science and Technology AssociationTatsuno 6795165Japan Institute for Multidisciplinary Innovation University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Anhui UniversityHefei 230601China

Morphology engineering has been developed as one of the most widely used strategies for improving the performance of ***,the harsh reaction conditions and cumbersome reaction steps during the nanomaterials synthesis still limit their industrial ***,one-dimensional(1D)novel-segmented PtTe porous nanochains(PNCs)were successfully synthesized by the template methods assisted by Pt autocatalytic *** PtTe PNCs consist of consecutive mesoporous architectures that provide a large electrochemical surface area(ECSA)and abundant active sites to enhance methanol oxidation reaction(MOR).Furthermore,1D nanostructure as a robust sustaining frame can maintain a high mass/charge transfer rate in a long-term durability *** 2,000 cyclic voltammetry(CV)cycles,the ECSA value of PtTe PNCs remained as high as 44.47 m^(2)·gPt^(-1),which was much larger than that of commercial Pt/C(3.95 m^(2)·gPt^(-1)).The high catalytic activity and durability of PtTe PNCs are also supported by CO stripping test and density functional theory *** autocatalytic reduction-assisted synthesis provides new insights for designing efficient low-dimensional nanocatalysts.

关键词： autocatalytic process PtTe catalysts methanol oxidation reactions porous nanochain

华南地区观赏植物资源的发掘与选择配置策略分析

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分子植物育种 2024年第2期22卷 615-622页

作者：谭聪丽东莞职业技术学院东莞523808

随着华南地区城市化的快速发展,如何合理、科学地利用观赏植物资源进行城市绿化成了一个重要课题。本研究对华南地区的观赏植物资源进行了深入的发掘,结合该地区的气候、土壤和生态特点,提出了一套综合性的植物选择与配置策略。本研究... 详细信息

随着华南地区城市化的快速发展,如何合理、科学地利用观赏植物资源进行城市绿化成了一个重要课题。本研究对华南地区的观赏植物资源进行了深入的发掘,结合该地区的气候、土壤和生态特点,提出了一套综合性的植物选择与配置策略。本研究对华南地区的观赏植物资源进行了分类和描述,并结合实际应用需求,探讨了不同植物在各种城市功能区的配置策略。本研究还考虑了环境适应性、植物间的相互作用以及未来气候变化等因素,为城市园林规划与建设提供了有力的参考依据。

关键词：观赏植物华南地区选择配置城市绿化环境适应性

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立方对角面开孔人工鱼礁流场效应的数值模拟

水产学报 2024年第3期48卷 184-195页

作者：薛大文庞聪利潘昀浙江海洋大学船舶与海运学院

人工鱼礁是建设现代化海洋牧场的基础设施，为了研究在不同海域流速下，迎流角度对人工鱼礁的影响，实验基于Ansys-Fluent平台，采用RNG k-ε的湍流模型，进行数值水槽模拟，对结构边长为3 m的立方对角面开孔鱼礁在3种来流速度(0.5、1.0... 详细信息

人工鱼礁是建设现代化海洋牧场的基础设施，为了研究在不同海域流速下，迎流角度对人工鱼礁的影响，实验基于Ansys-Fluent平台，采用RNG k-ε的湍流模型，进行数值水槽模拟，对结构边长为3 m的立方对角面开孔鱼礁在3种来流速度(0.5、1.0和1.5 m/s)、4种迎流角度(0°、15°、30°和45°)下的上升流体积、背涡流体积、阻力、倾覆力矩等水动力特性进行比较分析。结果显示，人工鱼礁内部和周围存在具有显著特征的上升流区域和背涡流区域；流场规模的大小基本不受来流速度的影响；流速是影响立方对角面开孔人工稳定性的主要因素，流速越大，作用在礁体上的阻力和倾覆力矩相应变大，礁体的稳定性越差；迎流角度是影响人工鱼礁流场效应的主要因素，鱼礁的流场效应规模在迎流角度为30°～45°时达到最优，礁体为45°迎流时上升流体积和背涡流体积都达到最大值。利用权重赋值法，引入人工鱼礁建设效果综合评价模型，通过综合评价分析，在不考虑海底底质淤积、风浪等条件下，投放人工鱼礁时宜选取最大流速不超过1 m/s的海域，且迎流角在30°至45°范围内，鱼礁的建设效果最佳。

关键词：人工鱼礁海洋牧场流场效应数值模拟稳定性迎流角度