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Biological receptor-inspired flexible artificial synapse based on ionic dynamics

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Microsystems & Nanoengineering 2020年第1期6卷 507-516页

作者： Qifeng Lu Fuqin Sun Lin Liu Lianhui Li Yingyi wang Mingming Hao zihao wang Shuqi wang Ting Zhang i-Lab Key Laboratory of Multifunctional Nanomaterials and Smart SystemsSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)398 Ruoshui Road215123 SuzhouPR China Department of Health and Environmental Sciences Xi’an Jiaotong Liverpool University111 Ren’ai Road215123 SuzhouPR China Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of Sciences200031 ShanghaiPR China

The memristor has been regarded as a promising candidate for constructing a neuromorphic computing platform that is capable of confronting the bottleneck of the traditional von Neumann architecture.Here,inspired by the working mechanism of the G-protein-linked receptor of biological cells,a novel double-layer memristive device with reduced graphene oxide(rGO)nanosheets covered by chitosan(an ionic conductive polymer)as the channel material is constructed.The protons in chitosan and the functional groups in rGO nanosheets imitate the functions of the ligands and receptors of biological cells,respectively.Smooth changes in the response current depending on the historical applied voltages are observed,offering a promising pathway toward biorealistic synaptic emulation.The memristive behavior is mainly a result of the interaction between protons provided by chitosan and the defects and functional groups in the rGO nanosheets.The channel current is due to the hopping of protons through functional groups and is limited by the traps in the rGO nanosheets.The transition from short-term to long-term potentiation is achieved,and learning-forgetting behaviors of the memristor mimicking those of the human brain are demonstrated.Overall,the bioinspired memristor-type artificial synaptic device shows great potential in neuromorphic networks.

关键词： artificial offering dynamics

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基于实航数据驱动的无人艇操纵运动辨识建模

中国造船 2024年第1期65卷 146-155页

作者：王子豪程健谢文博宋锐彭艳上海大学人工智能研究院上海200444 海洋智能无人系统装备教育部工程研究中心上海200444 上海大学机电工程与自动化学院上海200444

为快速构建符合海洋航行器实际运动特性的操纵运动模型,开展基于“精海”无人艇实航湖试数据驱动的无人艇操纵运动辨识建模研究。无人艇操纵运动辨识建模的框架以非线性水动力模型和推进器经验模型作为先验知识约束,利用随机舵角序列激... 详细信息

为快速构建符合海洋航行器实际运动特性的操纵运动模型,开展基于“精海”无人艇实航湖试数据驱动的无人艇操纵运动辨识建模研究。无人艇操纵运动辨识建模的框架以非线性水动力模型和推进器经验模型作为先验知识约束,利用随机舵角序列激励下的航行数据作为训练集,采用支持向量机回归方法完成建模过程,着重探讨了在环境干扰下构建艇体动力学模型的可行性。结果表明,所提出的方法能够快速构建具有非线性特性的无人艇操纵运动模型;先验的模型结构有效降低了实航数据中浪和流的影响,构建的模型能够有效预测回转、Z形等操纵运动的状态变化,具有良好的泛化能力。

关键词：无人艇操纵性数据驱动辨识建模实航数据

Promoting Metro Operation Safety by Exploring Metro Operation Accident Network

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Journal of Systems Science and Information 2021年第4期9卷 455-468页

作者： Qi SUO Liyuan wang Tianzi YAO zihao wang School of Economics and Management Qingdao University of Science and TechnologyQingdao 266061China

Understanding the causation of accidents is essential to promote metro operation safety.In terms of 243 reported metro operation accident cases in China, a directed weighted network was constructed based on complex network theory, where nodes and directed edges denotes factors and event chains respectively. To reveal the key causal factors, the topological characteristics of metro operation accident network(MOAN) were analyzed from both global and local views. The results show that facility-type factors are more closely related to the occurrence of the accidents from the perspectives of average path length and cascading effects. Accident types like train delay and train suspension are the great risk recipients. Key causal factors with large out-degree, out-strength, betweenness centrality and cluster coefficient, such as communication and signal failure, vehicle failure and piling into the train should be noticed. The research framework proposed in the paper is not only applicable to China’s metro operation system, but also appropriate for other transportation system safety studies.

关键词： operation accident analysis directed weighted network metro operation accident network(MOAN) complex network

A local-optimization refinement algorithm in single particle analysis for macromolecular complex with multiple rigid modules

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Protein & Cell 2016年第1期7卷 46-62页

作者： Hong Shan zihao wang Fa Zhang Yong Xiong Chang-Cheng Yin Fei Sun Department of Biophysics College of Basic Medical Sciences Peking University Health Science Center Beijing 100191China National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China Key Lab of Intelligent Information Processing and Advanced Computing Research Lab Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Department of Molecular Biophysics and Biochemistry Yale University New Haven CT 06511 USA Center for Biological Imaging Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China

Single particle analysis, which can be regarded as an average of signals from thousands or even millions of particle projections, is an efficient method to study the three-dimensional structures of biological macro- molecules. An intrinsic assumption in single particle analysis is that all the analyzed particles must have identical composition and conformation. Thus specimen heterogeneity in either composition or conformation has raised great challenges for high-resolution analysis. For particles with multiple conformations, inaccurate align- ments and orientation parameters will yield an averaged map with diminished resolution and smeared density. Besides extensive classification approaches, here based on the assumption that the macromolecular complex is made up of multiple rigid modules whose relative orien- tations and positions are in slight fluctuation around equilibriums, we propose a new method called as local optimization refinement to address this conformational heterogeneity for an improved resolution. The key idea is to optimize the orientation and shift parameters of each rigid module and then reconstruct their three-dimen- sional structures individually. Using simulated data of 80S/70S ribosomes with relative fluctuations between the large （60S/50S） and the small （40S/30S） subunits, we tested this algorithm and found that the resolutions of both subunits are significantly improved. Our method provides a proof-of-principle solution for high-resolutionsingle particle analysis of macromolecular complexes with dynamic conformations.

关键词： cryo-electron microscopy single particleanalysis conformational heterogeneity rigid module Iocaoptimization refinement

基于PLUS-InVEST模型的呼和浩特市多情景土地利用变化动态模拟及碳储量评估

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农业资源与环境学报 2024年第2期41卷 292-304页

作者：王子昊王冰张宇飞张秋良内蒙古农业大学林学院呼和浩特010019 内蒙古大兴安岭森林生态系统国家野外科学观测研究站内蒙古根河022350

为探究呼和浩特市土地利用变化对生态系统碳储量的影响,本研究基于InVEST模型与PLUS模型模拟预测呼和浩特市在自然发展、生态保护、耕地保护、城市发展4种情景下的土地利用与碳储量。结果表明:1990-2020年呼和浩特市不透水面、林地、草... 详细信息

为探究呼和浩特市土地利用变化对生态系统碳储量的影响,本研究基于InVEST模型与PLUS模型模拟预测呼和浩特市在自然发展、生态保护、耕地保护、城市发展4种情景下的土地利用与碳储量。结果表明:1990-2020年呼和浩特市不透水面、林地、草地、水体等土地利用类型的面积呈增加状态,耕地、裸地、灌木地等土地类型的面积呈减少状态,其中灌木地和裸地的土地转出率较高,分别为93.63%和98.24%。InVEST模型估算结果显示,不透水面不断扩张,侵蚀耕地等高碳密度土地类型,造成呼和浩特市1990-2020年碳储量呈逐年递减趋势。2030年自然发展、生态保护、耕地保护、城市发展情景模拟下的呼和浩特市的碳储量与2020年相比均呈现减少状态,其中耕地保护情景碳储量降幅最小,其次为生态保护情景,说明采取合理的保护措施能够有效抑制碳储量下降。耕地保护情景能够有效减缓城市建筑的扩张趋势,生态保护情景则可有效增加水体、草地等生态类用地面积。研究表明,落实耕地和生态保护政策、优化土地利用结构、提高土地利用效率对呼和浩特市的可持续发展均有重要意义。

关键词：呼和浩特市 PLUS模型 InVEST模型土地利用碳储量

Design and test of the beam-based alignment sextupole experimental mover prototype for HEPS

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Radiation Detection Technology and Methods 2021年第4期5卷 570-575页

作者： Lei Wu Ningchuang Zhou Chunhua Li zihao wang Institute of High Energy Physics Chinese Academy of SciencesBeijingChina

Background Sextupoles in the storage ring of HEPS will be adjusted based on beam trajectory.The mechanical design of a beam-based alignment sextupole mover should be developed.The motion accuracy of the mover should be better than 5µm under 450 kg load of sextupoles.The movement range is required to be±0.3 mm in both horizontal direction and vertical direction.And the first-order natural frequency of the magnet support system which include movers should be higher than 54 Hz.Purpose The purpose of this paper is to design a mover prototype and to realize its movement performance and equivalent stiffness.And to find the difficulties of development of this mover.Method Interferometer is used to measure the motion accuracy,and pressure accelerometer is used to test the mover equivalent stiffness.Combining with the actual measurement results of equivalent stiffness,the natural frequency of the magnet support system is simulated.Result The motion accuracy reaches to 5.3µm in vertical direction and 1µm in horizontal direction,respectively.The equivalent stiffness of the mover prototype can just able to meet the requirement of frequency of the HEPS magnet support system.Unwanted movement coupling has occurred during the mover exercises in vertical direction.Conclusions Through the research of experimental mover prototype,the methods have been learnt to improve the movement performance and equivalent stiffness of the mover based on sliding friction under high load.However,further researches and improvements are necessary to fix the coupling error during the vertical movement.

关键词： Beam-based alignment Mover Motion accuracy Equivalent stiffness

Mitigating fast thermal instability by engineered laser sweep in AlN soliton microcomb generation

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光子学研究:英文版 2023年第8期11卷 I0012-I0020页

作者： KEWEI LIU zihao wang SHUNYU YAO YANAN GUO JIANCHANG YAN JUNXI wang CHANGXI YANG CHENGYING BAO State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China Center for Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Research and Development Center for Solid State Lighting Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Transient thermal instability represents a significant challenge in generating soliton microcombs.Fast laser sweep can be an efficient method to mitigate thermal instability,but it requires an ultrahigh laser sweep rate for crystalline microresonators with fast thermal relaxation.Here,we engineer a laser sweep waveform to generate AlNon-sapphire soliton microcombs with an intermediate sweep speed(<30 GHz∕μs).Two laser sweep methods with backward plus forward tuning or two-step backward tuning added after the fast forward laser sweep were demonstrated to stabilize solitons.Reducing the soliton number is found to be useful to stabilize solitons in fast laser sweep.The effectiveness of the methods was numerically verified.Our measurements and simulations also reveal the impacts of different thermal relaxation processes occurring at quite different time scales on thermal instability.The requirement of the laser sweep protocols is discussed.

关键词： tuning laser sapphire

Advances of semiconductor mode-locked laser for optical frequency comb generation

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National Science Open 2022年第3期1卷 87-108页

作者： Wenqi Wei Jiajian Chen Jingzhi Huang zihao wang Jianjun Zhang Ting wang Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Semiconductor mode-locked lasers(MLLs)can provide coherent optical frequency combs(OFCs)with high repetition rates and output power,which have been recognized as potential multi-wavelength sources used in optical communication field due to their compactness,high-efficiency,and low-cost properties.In this article,we have reviewed recent development of semiconductor MLL-based frequency comb generation.Different approaches of semiconductor MLLs for OFC generation are synoptically summarized based on various material platforms.The representative progress of III-V semiconductor MLLs on III-V platform and especially on Si substrates is both discussed for the applications in integrated silicon photonics.

关键词： optical frequency combs semiconductor mode-locked lasers silicon-based photonic integrated circuits monolithic and heterogeneous integration

Stable epidermal electronic device with strain isolation induced by in situ Joule heating

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Microsystems & Nanoengineering 2021年第4期7卷 93-102页

作者： zihao wang Qifeng Lu Yizhang Xia Simin Feng Yixiang Shi Shuqi wang Xianqing Yang Yangyong Zhao Fuqin Sun Tie Li Ting Zhang Hab Key Laboratory of Multifunctional Nanomaterials and Smart SystemsSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)398 Ruoshui RoadSuzhouJiangsu 215123P.R.China Nano Science and Technology Institute University of Science and Technology of China96 Jinzhai RoadHefeiAnhui 230026P.R.China School of Computer Science&School of Cyberspace Science XiangTan UniversityYuhu DistrictXiangtanHunan 411105P.R.China

Epidermal electronics play increasingly important roles in human-machine intetfaces.However,their efficient fabrication while maintaining device stability and reliability remains an unresolved challenge.Here,a facile in situ Joule heating method is proposed for fabricating stable epidermal electronics on a polyvinyl alcohol(PVA)substrate.Benefiting from the precise control of heating locations,the crystallization and enhanced rigidity of PVA are restricted to desired areas,leading to strain isolation of the active regions.As a result,the electronic device can be conformably attached to skin while showing negligible degradation in device performance during deformation.Based on this method,a flexible surface electromyography(sEMG)sensor with outstanding stability and highly comfortable wearability is demonstrated,showing high accuracy(91.83%)for human hand gesture recognition.These results imply that the fabrication method proposed in this research is a facile and reliable approach for the fabrication of epidermal electronics.

关键词： strain electronic rigidity