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Van der Waals ferroelectric transistors:the all-round artificial synapses for high-precision neuromorphic computing

Chip 2023年第2期2卷 8-15页

作者： Zhongwang Wang Xuefan Zhou Xiaochi Liu Aocheng Qiu Caifang Gao yahua yuan Yumei Jing Dou Zhang Wenwu Li Hang Luo Junhao Chu Jian Sun School of Physics and Electronics Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsDepartment of Materials ScienceFudan UniversityShanghai 200433China National Key Laboratory of Integrated Circuit Chips and Systems Zhang Jiang Fudan International Innovation CenterFudan UniversityShanghai 200433China Raith China Beijing 100013China

State number,operation power,dynamic range and conductance weight update linearity are key synaptic device performance metrics for high-accuracy and low-power-consumption neuromorphic com-puting in ***,high linearity and low power consump-tion couldn’t be simultaneously achieved by most of the reported synaptic devices,which limits the performance of the *** work demonstrates van der Waals(vdW)stacked ferroelectric field-effect transistors(FeFET)with single-crystalline ferroelectric *** are of fine vdW interface and partial polar-ization switching of multi-domains under electric field pulses,which makes the FeFETs exhibit multi-state memory characteristics and ex-cellent synaptic *** also exhibit a desired linear conduc-tance weight update with 128 conductance states,a sufficiently high dynamic range of G_(max)/G_(min)>120,and a low power consumption of 10 fJ/spike using identical *** on such an all-round device,a two-layer artificial neural network was built to conduct Modified Na-tional Institute of Standards and Technology(MNIST)digital num-bers and electrocardiogram(ECG)pattern-recognition simulations,with the high accuracies reaching 97.6%and 92.4%,*** remarkable performance demonstrates that vdW-FeFET is of obvious advantages in high-precision neuromorphic computing applications.

关键词： Ferroelectric transistors Ferroelectric van der Waals het-erostructures Artificial synapses Neuromorphic computing

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ON THE BEST UNIFORM CONVERGENCE RATE OF EB ESTIMATORS

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Systems Science and Mathematical Sciences 1995年第1期8卷 52-56页

作者： LIANG Hua (Institute of Systems Science, Academia Sinica, Beijing 100080, China)yuan yahua (Department of Arizona State University, Az 85287-1804, U.S.A.) 中科院系统科学所北京 Arizona State University 美国

ＯＮＴＨＥＢＥＳＴＵＮＩＦＯＲＭＣＯＮＶＥＲＧＥＮＣＥＲＡＴＥＯＦＥＢＥＳＴＩＭＡＴＯＲＳＬＩＡＮＧＨｕａ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅｉｊｉｎｇ１０００８０... 详细信息

ＯＮＴＨＥＢＥＳＴＵＮＩＦＯＲＭＣＯＮＶＥＲＧＥＮＣＥＲＡＴＥＯＦＥＢＥＳＴＩＭＡＴＯＲＳＬＩＡＮＧＨｕａ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅｉｊｉｎｇ１０００８０，Ｃｈｉｎａ）ＹＵＡＮＹａｈｕａ（...

关键词： Empirical Bayes estimators best uniform convergence rate.

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最小路集的邻接终点矩阵算法

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西北工业大学学报 1989年第4期7卷 473-478页

作者：袁亚华王自果西北工业大学

本文定义了邻接矩阵与终点矩阵间的一种特殊运算,直接求得网络的最小路集。本算法具有步骤明确、规则简单,概念清楚、易于应用的特点。本算法只需进行判断和赋值,与现有算法[1,2]相比,避免了乘加等复杂运算,因此还具有运算速度快的特点... 详细信息

本文定义了邻接矩阵与终点矩阵间的一种特殊运算,直接求得网络的最小路集。本算法具有步骤明确、规则简单,概念清楚、易于应用的特点。本算法只需进行判断和赋值,与现有算法[1,2]相比,避免了乘加等复杂运算,因此还具有运算速度快的特点。文中给出了算法的收敛性证明,以及算法的步骤和框图,并举例对算法进行了说明。

关键词：网络算法最小路集

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Engineer Nanoscale Defects into Selective Channels:MOF-Enhanced Li^(+) Separation by Porous Layered Double Hydroxide Membrane

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Nano-Micro Letters 2023年第9期15卷 325-336页

作者： yahua Lu Rongkun Zhou Naixin Wang Yuye Yang Zilong Zheng Miao Zhang Quan-Fu An Jiayin yuan Beijing Key Laboratory for Green Catalysis and Separation Department of Chemical EngineeringBeijing University of TechnologyBeijing 100124People’s Republic of China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124People’s Republic of China Department of Materials and Environmental Chemistry Stockholm University10691 StockholmSweden

Two-dimensional(2D)membrane-based ion separation technology has been increasingly explored to address the problem of lithium resource shortage,yet it remains a sound challenge to design 2D membranes of high selectivity and permeability for ion separation *** imidazolate framework functionalized modified layered double hydroxide(ZIF-8@MLDH)composite membranes with high lithium-ion(Li^(+)) permeability and excellent operational stability were obtained in this work by in situ depositing functional ZIF-8 nanoparticles into the nanopores acting as framework defects in MLDH *** defect-rich framework amplified the permeability of Li^(+),and the site-selective growth of ZIF-8 in the framework defects bettered its *** speaking,the ZIF-8@MLDH membranes featured a high permeation rate of Li^(+) up to 1.73 mol m^(−2) h^(−1) and a desirable selectiv-ity of Li^(+)/Mg^(2+) up to *** supported that the simultaneously enhanced selectivity and permeability of Li+are attributed to changes in the type of mass transfer channels and the difference in the dehydration capacity of hydrated metal cations when they pass through nanochannels of *** study will inspire the ongoing research of high-performance 2D membranes through the engineering of defects.

关键词： Nanoscale defect construction Nanoparticles restrict growth Two-dimensional composite membrane Lithium-ion extraction High stability

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Moisture electricity generation:Mechanisms,structures,and applications

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Nano Research 2023年第5期16卷 7496-7510页

作者： Quanmao Wei Wenna Ge Zichao yuan Shixu Wang Chenguang Lu Shile Feng Lei Zhao yahua Liu Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyang 621000China

With the increasing concern of energy crisis and global warming,the whole globe is in an urgent need to develop clean energy that comes from renewable sources and does not harm the environment to fulfill the carbon neutralization and green earth *** is the most abundant substance on earth and has been historically used as the major energy carriers in watermill,water wheel,*** electricity generation is another emerging technology that can convert lowgrade energy in the widely-accessible moisture to electricity simply by the integration of moisture,electrodes,deliberatelydesigned hygroscopic *** research on moisture electricity generators(MEGs)led to the creation of a series of selfpowered sensors and in some occasions they have replaced conventional batteries to power miniaturized *** this review,the basic mechanisms of MEGs are firstly clarified,three categories of them,i.e.,gradient structure,homogeneous structure,and heterogeneous structure depending on the structure of hygroscopic films,are then ***,recent advances in the fabrication,characteristics,performance of MEGs are summarized,MEGs with continuous or transient output that could be applied in self-powered sensors and power sources are ***,some remaining challenges and our perspectives on MEGs are highlighted.

关键词： moisture hygroelectricity nanogenerators structures hygroscopic film

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Bionic superhydrophobic surfaces based on topography of copper oxides

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Biosurface and Biotribology 2022年第3期8卷 199-211页

作者： Chen Chen Haiyang Zhan Xiangge Bai Zichao yuan Lei Zhao yahua Liu Shile Feng Key Laboratory for Precision&Non‐traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianChina

Superhydrophobic surfaces(SHSs)exist in many biological organisms endowed by spectacular surface topographies,which provide important insights to drive a paradigm shift in design of engineering *** on this,extensive progresses have been developed on bionic superhydrophobic *** them,SHSs based on topography of copper oxides exhibit considerable application prospects because of the steerability and diversity of topography,as well as additional performances,such as antibiosis,anticorrosion and *** first present a brief overview of the discovery of natural SHSs as well as fundamental understanding of surface wetting ***,the structural effects in superhydrophobic systems based on the topographies of biological organisms and copper oxides are ***,we highlight the perspectives on the novel design strategies of copper oxide‐based SHSs that adapt to various practical applications.

关键词： biological organisms bionic SHSs copper‐oxides topography wetting

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Clinical outcomes of coronavirus disease 2019 (COVID-19) in cancer patients with prior exposure to immune checkpoint inhibitors

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Cancer Communications 2020年第8期40卷 374-379页

作者： Qiuji Wu Qian Chu Hongyan Zhang Bin Yang Xudong He yahua Zhong Xianglin yuan Melvin L.K.Chua Conghua Xie Department of Radiation and Medical Oncology Zhongnan Hospital of Wuhan UniversityWuhanHubei 430071P.R.China Hubei Key Laboratory of Tumor Biological Behaviors Zhongnan Hospital ofWuhan UniversityWuhanHubei 430071P.R.China Hubei Cancer Clinical Study Center Zhongnan Hospital ofWuhan UniversityWuhanHubei 430071P.R.China Department of Oncology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430030P.R.China Department of Medical Oncology Hubei Cancer HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430079P.R.China Department of Gastroenterology Dongfeng HospitalHubei University of MedicineShiyanHubei 442000P.R.China Divisions of Radiation Oncology and Medical Sciences National Cancer Centre SingaporeSingapore 169610Singapore Oncology Academic Programme Duke-NUS Medical SchoolSingapore 169857Singapore

Dear Editor,The coronavirus disease 2019(COVID-19)pandemic has affected over 6,000,000 people globally[1].Patients with COVID-19 manifest with symptoms of fever,dry cough,dyspnea,and present with radiological changes that are consistent with atypical pneumonia[2].Pathogenetic mechanisms for these abnormalities involve the systemic immune response that is associated with the hyperactivation of peripheral CD8+and CD4+T cells,and a cytokine storm[3].Globally,the reported prevalence of patients with COVID-19 and cancer ranges from 0.5%to 6.0%in the different case series[4].

关键词： patients cancer immune

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Double Hydroxide Membrane Engineer Nanoscale Defects into Selective Channels:MOF-Enhanced Li+ Separation by Porous Layered

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Nano-Micro Letters 2023年第9期 333-344页

作者： yahua Lu Rongkun Zhou Naixin Wang Yuye Yang Zilong Zheng Miao Zhang Quan-Fu An Jiayin yuan Beijing Key Laboratory for Green Catalysis and Separation Department of Chemical Engineering Beijing University of Technology Department of Materials and Environmental Chemistry Stockholm University Faculty of Materials and Manufacturing Beijing University of Technology

Two-dimensional(2D) membrane-based ion separation technology has been increasingly explored to address the problem of lithium resource shortage, yet it remains a sound challenge to design 2D membranes of high selectivity and permeability for ion separation applications. Zeolitic imidazolate framework functionalized modified layered double hydroxide(ZIF-8@MLDH) composite membranes with high lithium-ion(Li+) permeability and excellent operational stability were obtained in this work by in situ depositing functional ZIF-8 nanoparticles into the nanopores acting as framework defects in MLDH membranes. The defect-rich framework amplified the permeability of Li+, and the site-selective growth of ZIF-8 in the framework defects bettered its selectivity. Specifically speaking, the ZIF-8@MLDH membranes featured a high permeation rate of Li+ up to 1.73 mol m-2h-1and a desirable selectivity of Li+/Mg2+up to 31.9. Simulations supported that the simultaneously enhanced selectivity and permeability of Li+ are attributed to changes in the type of mass transfer channels and the difference in the dehydration capacity of hydrated metal cations when they pass through nanochannels of ZIF-8. This study will inspire the ongoing research of high-performance 2D membranes through the engineering of defects.

关键词：

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基于夜间灯光遥感数据的城市土地集约利用评价模型

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农业工程学报 2018年第8期34卷 262-268页

作者：程歆邵华李杨王亚华袁源南京工业大学测绘科学与技术学院南京211800 虚拟地理环境教育部重点实验室(南京师范大学) 南京210023 江苏省地理环境演化国家重点实验室培育建设点南京210023 江苏省地理信息资源开发与利用协同创新中心南京210023

该文利用夜间灯光遥感数据和城市建城区统计数据进行城市土地集约利用研究,构建基于城市灯光强度的土地集约利用评价模型,并对城市夜间灯光和土地城市化的异速生长特征进行分析;考虑到城市灯光数据反映出的土地城市化可能存在滞后效应,... 详细信息

该文利用夜间灯光遥感数据和城市建城区统计数据进行城市土地集约利用研究,构建基于城市灯光强度的土地集约利用评价模型,并对城市夜间灯光和土地城市化的异速生长特征进行分析;考虑到城市灯光数据反映出的土地城市化可能存在滞后效应,提出一种顾及滞后效应的城市灯光-土地城市化水平土地集约利用评价模型,选择江苏省不同发展水平的典型城市,分别进行基于滞后项系数的灯光与存量用地和新增用地之间的制约关系分析。试验结果表明:夜间灯光遥感数据能较好反映城市土地利用水平,城市灯光相对于土地城市化存在滞后现象,相比于传统的异速生长模型,该文提出的顾及滞后效应的异速生长模型在城市土地集约利用的研究中拟合优度有较明显的提高,在江苏省5个典型城市的对比试验中平均提高4.0%,并且江苏省"1+3"新功能区格局在异速生长模型特征分析中也有明显的地区特征,验证了模型的适用性。该研究可为中国城市化过程中的土地集约利用评价方法提供参考。

关键词：土地利用模型遥感夜间灯光异速生长城市化土地集约利用

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多尺度视角下高校教育用地集约利用评价研究——以山东省为例

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中国土地科学 2018年第10期32卷 67-74页

作者：吴菊袁源王亚华杨壮壮南京师范大学地理科学学院江苏南京210023 江苏省地理信息资源开发与利用协同创新中心江苏南京210023

研究目的:从宏观—中观—微观尺度研究山东省高校教育用地集约利用水平并提出相关对策建议,对土地供给侧结构性改革背景下制定科学合理的高校用地政策具有参考价值。研究方法:多因素综合评价法、空间分异法、对比分析法。研究结果:(1)... 详细信息

研究目的:从宏观—中观—微观尺度研究山东省高校教育用地集约利用水平并提出相关对策建议,对土地供给侧结构性改革背景下制定科学合理的高校用地政策具有参考价值。研究方法:多因素综合评价法、空间分异法、对比分析法。研究结果:(1)宏观尺度上,全省高校教育用地集约利用得分为79.45分,全省67所高校中最高为100分、最低仅为35.68分,差异明显;不同类型高校得分也存在显著差距,部分院校特色用地安排不足;(2)中观尺度上,全省高校教育用地集约利用空间格局与区域经济发展水平基本吻合,呈现由东向西递减的空间特征。城市规模等级与土地集约利用水平存在正相关,等级越高,集约程度越高;(3)微观尺度上,老校区集约度高于新校区;经翻修和扩建后的老校区,集约水平高于非教学用地比重大的老校区。研究结论:山东省高校教育用地集约利用水平不高且区域差异明显,建设时间、区位条件、结构布局等是影响高校教育用地集约利用水平的主要因素,不同情况下的高校建设标准应酌情考虑。

关键词：土地利用集约利用评价高校教育用地多尺度视角山东省

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