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Flexible memristors as electronic synapses for neuro- inspired computation based on scotch tape-exfoliated mica substrates

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Nano Research 2018年第3期11卷 1183-1192页

作者： Xiaobing Yan Zhenyu Zhou jianhui Zhao Qi Liu Hong Wang Guoliang Yuan Jingsheng chen College of Electron and Information Engineering Key Laboratory of Digital Medical Engineering of Hebei Province Key Laboratory of Optoelectronic Information Materials of Hebei Province Hebei University Baoding 071002 China Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Materials Science and Engineering National University of Singapore Singapore 117576 Singapore

Flexible memristor devices based on plastic substrates have attracted considerable attention due to their applications in wearable computers and integrated circuits. However, most plastic-substrate memristors cannot function or be grown in high-temperature environments. In this study, scotch-tape-exfoliated mica was used as the flexible memristor substrate in order to resolve these high-temperature issues. Our TiN/ZHO/IGZO memristor, which was constructed using a thin （10 μm） mica substrate, has superior flexibility and thermostability. After bending it 103 times, the device continues to exhibit exceptional electrical characteristics. It can also be implemented for transitions between high and low resistance states, even in temperatures of up to 300 ℃. More importantly, the biological synaptic characteristics of paired-pulse facilitation/depression （PPF/PPD） and spike- timing-dependent plasticity （STDP） were observed through applying different pulse measurement modes. This work demonstrates that flexible memristor devices on mica substrates may potentially allow for the realization of high-temperature memristor applications for biologically-inspired computing systems.

关键词： mica flexible memristor synapse

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Optimization method for diagnostic sequence based on improved particle swarm optimization algorithm

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Journal of Systems Engineering and Electronics 2009年第4期20卷 899-905页

作者： Lian Guangyao Huang Kaoli chen jianhui Gao Fengqi Ordnance Engineering Coll. Shijiazhuang 050003 P. R. China

To realize the requirement of diagnostic sequence optimization in the process of design for testability, the authors put forward an optimization method based on quantum-behaved particle swarm optimization （QPSO） algorithm. By a precedence ordering coding, the diagnostic sequence optimization can be translated into a precedence ordering problem in the multidimensional space of swarm. It can get the optimizing order quickly by using the powerful and quick search capability of QPSO algorithm, and the order is the diagnostic sequence for the system. The realization of the method is simpler than other methods, and the results are more excellent than others, and it has been applied in the engineering practice.

关键词： diagnostic sequence optimization design for testability intelligent optimization QPSO algorithm

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Modeling of multiphase flow in low permeability porous media:Effect of wettability and pore structure properties

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1127-1139页

作者： Xiangjie Qin Yuxuan Xia Juncheng Qiao Jiaheng chen jianhui Zeng Jianchao Cai National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249China Research Institute of Petroleum Exploration and Development Beijing10083China

Multiphase flow in low permeability porous media is involved in numerous energy and environmental applications.However,a complete description of this process is challenging due to the limited modeling scale and the effects of complex pore structures and wettability.To address this issue,based on the digital rock of low permeability sandstone,a direct numerical simulation is performed considering the interphase drag and boundary slip to clarify the microscopic water-oil displacement process.In addition,a dual-porosity pore network model(PNM)is constructed to obtain the water-oil relative permeability of the sample.The displacement efficiency as a recovery process is assessed under different wetting and pore structure properties.Results show that microscopic displacement mechanisms explain the corresponding macroscopic relative permeability.The injected water breaks through the outlet earlier with a large mass flow,while thick oil films exist in rough hydrophobic surfaces and poorly connected pores.The variation of water-oil relative permeability is significant,and residual oil saturation is high in the oil-wet system.The flooding is extensive,and the residual oil is trapped in complex pore networks for hydrophilic pore surfaces;thus,water relative permeability is lower in the water-wet system.While the displacement efficiency is the worst in mixed-wetting systems for poor water connectivity.Microporosity negatively correlates with invading oil volume fraction due to strong capillary resistance,and a large microporosity corresponds to low residual oil saturation.This work provides insights into the water-oil flow from different modeling perspectives and helps to optimize the development plan for enhanced recovery.

关键词： Low permeability porous media Water-oil flow Wettability Pore structures Dual porosity pore network model(PNM) Free surface model

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A three dimensional visualized physical simulation for natural gas charging in the micro-nano pore system

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Petroleum Exploration and Development 2022年第2期49卷 349-362页

作者： QIAO Juncheng ZENG jianhui XIA Yuxuan CAI Jianchao chen Dongxia JIANG Shu HAN Guomeng CAO Zhe FENG Xiao FENG Sen- State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249.China College of Geosciences China University of PetroleumBeijing 102249China Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Dagang Oilfield Company PetroChinaTianjin 300280China Sinopec Petroleum Exploration and Production Research Institute Beijing 102206China CNPC Engineering Technology R&D Company Limited Beijing 102206China

A micro-nano pore three-dimensional visualized real-time physical simulation of natural gas charging, in-situ pore-scale computation, pore network modelling, and apparent permeability evaluation theory were used to investigate laws of gas and water flow and their distribution, and controlling factors during the gas charging process in low-permeability(tight) sandstone reservoir. By describing features of gas-water flow and distribution and their variations in the micro-nano pore system, it is found that the gas charging in the low permeability(tight) sandstone can be divided into two stages, expansion stage and stable stage. In the expansion stage, the gas flows continuously first into large-sized pores then small-sized pores, and first into centers of the pores then edges of pores;pore-throats greater than 20 μm in radius make up the major pathway for gas charging. With the increase of charging pressure, movable water in the edges of large-sized pores and in the centers of small pores is displaced out successively. Pore-throats of 20-50 μm in radius and pore-throats less than 20 μm in radius dominate the expansion of gas charging channels at different stages of charging in turn, leading to reductions in pore-throat radius, throat length and coordination number of the pathway, which is the main increase stage of gas permeability and gas saturation. Among which, pore-throats 30-50 μm in radius control the increase pattern of gas saturation. In the stable stage, gas charging pathways have expanded to the maximum, so the pathways keep stable in pore-throat radius, throat length, and coordination number, and irreducible water remains in the pore system, the gas phase is in concentrated clusters, while the water phase is in the form of dispersed thin film, and the gas saturation and gas permeability tend stable. Connected pore-throats less than 20 μm in radius control the expansion limit of the charging pathways, the formation of stable gas-water distribution, and the maximum gas saturation. The heterogeneity of conne

关键词： low permeability(tight)sandstone gas charging three-dimensional visualization physical simulation micro-nanometer pore network gas and water flow and distribution

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黄河流域爱国主义教育基地空间格局及影响因素研究

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干旱区地理 2023年第9期46卷 1536-1544页

作者：李建辉陈琳党争黄河水利职业技术学院测绘工程学院河南开封475004

爱国主义教育基地是加强爱国教育、传承红色基因的重要场所。以黄河流域171个国家级爱国主义教育基地为研究对象,综合运用地理空间分析方法揭示了爱国主义教育基地的空间分布格局,并利用地理探测器工具测度了其影响因素。结果表明:(1)... 详细信息

爱国主义教育基地是加强爱国教育、传承红色基因的重要场所。以黄河流域171个国家级爱国主义教育基地为研究对象,综合运用地理空间分析方法揭示了爱国主义教育基地的空间分布格局,并利用地理探测器工具测度了其影响因素。结果表明:(1)黄河流域爱国主义教育基地类型结构不均衡,革命传统教育类占比最高,建设成就标志类占比最低。(2)区域上整体呈集聚型分布,数量差异明显,表现为“上游多中游少,川豫多青宁少”的特征。(3)核密度呈现以延安市为核心、4个高密度区和2个次高密度区的“氺”字型分布格局。(4)冷热极化显著,主要以冷点区分布为主,热点区集中于黄河中上游的陕西省、甘肃省和宁夏回族自治区交界的8个城市。(5)文化环境、人口规模和交通水平是影响黄河流域爱国主义教育基地空间格局的强势因素,其中红色旅游资源、文化场馆、人口密度、举办活动、参观人次、客运量是核心影响因子。研究结果可为黄河流域爱国主义教育基地空间布局优化和助推黄河红色文化高质量发展提供参考依据。

关键词：爱国主义教育基地空间格局影响因素地理探测器黄河流域

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Proximal gastric cancer： lymph node metastatic patterns according to different T stages dictate surgical approach

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Chinese Medical Journal 2014年第23期127卷 4049-4054页

作者： Song Wu Liu Yuyi Ye Jinning Peng Jianjun He Weiling chen Jianhui CHEN Chuangqi He Yulong Department of Gastrointestinal Surgery First Affiliated Hospital Sun Yat-sen University Guangzhou Guangdong 510080 China

Background As a common form of gastric cancer migration,lymph node metastasis largely affects the surgical treatment and prognosis of gastric cancer.Surgery is the fundamental curative option for gastric cancer that varies depending on different stages.The study aimed to compare the clinicopathological characteristics and lymph node metastatic patterns in patients of proximal gastric cancer with different T stages and investigate a reasonable radical gastrectomy approach in terms of the range of lymphadenectomy for proximal gastric cancer.Methods In our retrospective study,the data of 328 patients of proximal gastric cancer with different T stages were analyzed.By comparing the differences of lymph node metastatic rate and ratio,we investigated the clinicopathological characteristics and metastatic patterns of lymph nodes.Also,we were especially interested in the differences in survival rates between patients with and without No.5 and 6 group metastasis with the same TNM stage.Results The overall lymph node metastatic rate and ratio of advanced proximal gastric cancer were 73.4％ and 23.3％,respectively.The tumors of different T stages were statistically significant in size and differentiation degree （P ＜0.05）,multivariate analysis showed that the depth of tumor invasion was an independent risk factor for lymph node metastasis in proximal gastric cancer （RR,12.025; 95％ CI,2.326 to 62.157; P=0.003）.The overall survival rate of patients with No.5,6 group lymph node metastasis and those without was significantly different,but the differences in survival rates between patients with and without No.5 and 6 group metastasis with the same TNM stage were not statistically significant.Conclusions Different T stages in proximal gastric cancer showed different patterns and characteristics of lymph node metastasis.D2 lymphadenectomy in patients with early gastric cancer had little survival benefit because metastasis to level 2 nodes was rare.Therefore the range of the lymph node dissection in radical gastrectomy for earty gastr

关键词： proximal gastric cancer lymph node metastasis surgical approach

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Flexible artificial synapse based on single-crystalline BiFeO_(3) thin film

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Nano Research 2022年第3期15卷 2682-2688页

作者： Zhen Zhao Amr Abdelsamie Rui Guo Shu Shi jianhui Zhao Weinan Lin Kaixuan Sun Jingjuan Wang Junling Wang Xiaobing Yan Jingsheng chen Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province College of Electron and Information EngineeringHebei UniversityBaoding 071002China Department of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117576Singapore Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Realization of functional flexible artificial synapse is a significant step toward neuromorphic computing.Herein,a flexible artificial synapse based on ferroelectric tunnel junctions(FTJs)is demonstrated,using BiFeO_(3)(BFO)thin film as the functional layer.The inorganic single crystalline FTJs grown on rigid perovskite substrates at high temperatures are integrated with the flexible plastic substrates,by using the water-soluble Sr_(3)Al_(2)O_(6)(SAO)as the sacrificial layer and the following transfer.The transferred freestanding BFO thin film exhibits excellent ferroelectric properties.Moreover,the memristive properties and the brain-like synaptic learning performance of the flexible FTJs are investigated.The results show that multilevel resistance states were maintained well of the flexible artificial synapse,together with their stable synaptic learning properties.Our work indicates the promising opportunity of ferroelectric thin film based flexible synapse used in the future neuromorphic computing system.

关键词： flexible ferroelectricity memristor artificial synapse

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方法与范畴:建构当代散文理论的可能性——论孙绍振的散文研究

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东吴学术 2020年第5期 55-65页

作者：陈剑晖广州大学文学思想研究中心广东省文史馆

孙绍振对当代散文研究的贡献,首先在于他特别重视散文研究的方法。表现为:一是回归散文的历史,从原点上寻找散文的生长点和创新点;二是从整体思维出发,将散文置于文学的整个系统之中,在散文与小说、诗歌的比较、联系和转化中探究散文的... 详细信息

孙绍振对当代散文研究的贡献,首先在于他特别重视散文研究的方法。表现为:一是回归散文的历史,从原点上寻找散文的生长点和创新点;二是从整体思维出发,将散文置于文学的整个系统之中,在散文与小说、诗歌的比较、联系和转化中探究散文的奥秘;三是归纳法,从事实出发,从个别的、具体的、特殊的感性上升为普遍的抽象;四是艺术分析的“还原法”,孙绍振的整个散文理论研究,贯穿着一种质疑批判精神,而对散文“审智”理论范畴的建构,则体现出孙绍振不满足于现状,力图开创散文研究的大场面、大气象的学术雄心。孙绍振的中国式散文文本解读,体现出他敏锐的审美眼光和把握艺术细微处的能力。孙绍振的散文研究,是他诗学思想的重要组成部分。尽管涉及较晚,其影响力尚不及其他方面,但孙绍振的散文研究具有标杆性的意义,值得我们认真加以梳理和总结。

关键词：孙绍振散文研究方法范畴

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学者散文与文体自觉

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中国文学批评 2020年第1期 69-76,M0005页

作者：陈剑晖广州大学文学思想研究中心广州510006

20世纪90年代以来出现的学者散文,是当代散文创作的一个重要现象。学者散文承接了中国的文章学传统,打通了古今散文的文脉。学者们的创作自由自在,率性任心,不受任何规矩的束缚,体现出一种真正的文体自觉。学者散文贴近散文本体,可以说... 详细信息

20世纪90年代以来出现的学者散文,是当代散文创作的一个重要现象。学者散文承接了中国的文章学传统,打通了古今散文的文脉。学者们的创作自由自在,率性任心,不受任何规矩的束缚,体现出一种真正的文体自觉。学者散文贴近散文本体,可以说是散文写作的正宗。它不但促使当代散文摆脱唯抒情的羁绊,拓展了当代散文的文体天地,而且将知识分子的精神生态与文体创造相融合,将文体的意义直接与文化自信相对接,从而使其散文写作具有独特的文化精神价值。立足于传统的文章学,在古今文体演变的大背景下,探讨学者散文的“文道合一”,微讽与幽默揶揄,以及独特的文笔、文气与氛围,有助于展开更为细致深入的研究。

关键词：学者散文文体自觉文章传统

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中国散文的风骨与气度

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东吴学术 2020年第2期 37-44页

作者：陈剑晖广州大学文学思想研究中心

散文的风骨,有形也无形;或者说,它是一种看似有形,但实却无形的一种状态。所谓有形,是散文基本的外在展示,而散文的那种让人看不见的无形风神气力,是散文的骨相呈现,是神韵内敛的气场所在。散文的气度,也是一个体现了中华民族文化精神,... 详细信息

散文的风骨,有形也无形;或者说,它是一种看似有形,但实却无形的一种状态。所谓有形,是散文基本的外在展示,而散文的那种让人看不见的无形风神气力,是散文的骨相呈现,是神韵内敛的气场所在。散文的气度,也是一个体现了中华民族文化精神,具有中华民族特色的术语,它主要指散文创作主体的气质,气魄、气格、风神、风姿、情态和胸怀。风骨与气度是中国古代艺术两个重要的理论范畴,但以往较少应用于散文。当下的散文,普遍缺失刚正劲健的风骨与雍容自信,气象万千的气度。因此,重申散文的风骨,对于提振当前的散文创作,救治甜腻之风和软骨之病适逢其时。

关键词：中国散文风骨气度

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