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Manufacturing of graphene based synaptic devices for optoelectronic applications 被引量:7
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作者 kui zhou Ziqi Jia +8 位作者 Xin-Qi Ma Wenbiao Niu Yao zhou Ning Huang Guanglong Ding Yan Yan Su-Ting Han Vellaisamy A L Roy Ye zhou 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第4期150-177,共28页
Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottl... Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware level.Artificial optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic systems.With the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic applications.Recent progress highlights the significance of implementing graphene into artificial synaptic devices.Herein,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first presented.Then,the roles of graphene in various synaptic devices are demonstrated.Furthermore,their typical optoelectronic applications in neuromorphic systems are reviewed.Finally,outlooks for development of synaptic devices based on graphene are proposed.This review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems. 展开更多
关键词 GRAPHENE synaptic device MEMRISTOR optoelectronic applications
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High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source
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作者 Jian-Xin Wang kui zhou +7 位作者 Peng Li De-Xin Xiao Li-Jun Shan Xu-Ming Shen Yu Liu Zheng zhou Han-Bin Wang Dai Wu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第4期51-61,共11页
We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering(ICS)X-ray source.By adding a short ... We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering(ICS)X-ray source.By adding a short standing-wave buncher between the RF gun and first booster in a conventional S-band photo-injector,electron bunches with a 500 pC charge can be compressed to the sub-picosecond level with very limited input RF power and an unchanged basic layout of the photo-injector.Beam dynamics analysis indicates that fine tuning of the focusing strength of the gun and linac solenoid can well balance additional focusing provided by the standing wave buncher and generate a well-compensated transverse emittance.Thorough bunching dynamics simulations with different operating conditions of the buncher show that a buncher with more cells and a moderate gradient is suitable for simultaneously obtaining a short bunch duration and low emittance.In a typical case of a 9-cell buncher with a 38 MV/m gradient,an ultrashort bunch duration of 0.5 ps(corresponding to a compression ratio of>5)and a low emittance of<1 mm mrad can be readily obtained for a 500 pC electron pulse.This feasible ballistic bunching scheme will facilitate the implementation of an ultrashort pulse mode inverse Compton scattering X-ray source on most existing S-band photo-injectors. 展开更多
关键词 Beam brightness Ballistic bunching Emittance compensation Compton scattering X-ray source
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Development Prospects of Processing and Utilization of Longtan Pearl Plum
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作者 Zhanwen HUANG Mingjuan LI +4 位作者 Xiangrong YOU Yayuan ZHANG Ping WEI Ying WANG kui zhou 《Agricultural Biotechnology》 CAS 2019年第2期179-184,共6页
Longtan pearl plum, as a new dominant fruit industry in Guangxi, has developed rapidly in recent years and become one of the major economic sources of fruit growers in Guangxi. It has a positive effect on promoting ec... Longtan pearl plum, as a new dominant fruit industry in Guangxi, has developed rapidly in recent years and become one of the major economic sources of fruit growers in Guangxi. It has a positive effect on promoting economic development and helping farmers to get out of poverty in Guangxi. But there is almost nothing to do with the processing and utilization. Taking the route of processing and utilization is an inevitable trend of development of Longtan pearl plum industry with the increase of the planting area and yield year by year. In this paper, based on the analysis of edible value of Longtan pearl plum, the development direction of processing and utilization of Longtan pearl plum was expounded, and some suggestions on the problems existing in the processing and utilization were put forward to provide reference for the processing and utilization of Longtan pearl plum. 展开更多
关键词 Longtan PEARL PLUM PROCESSING and UTILIZATION Development PROSPECTS PROBLEMS Suggestions
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用于接近-压力感知的全纸基智能传感器 被引量:2
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作者 宋熠霖 胡志鹏 +5 位作者 李俊东 钟梓晗 赵鹏飞 周奎 韩素婷 周晔 《中国科学:化学》 CAS CSCD 北大核心 2024年第4期667-676,共10页
近年来,伴随可穿戴电子设备与日俱增的需求,成本低廉、绿色环保、可批量生产的纸基传感器得以快速发展.然而,目前的纸基传感器仍有两大挑战亟待解决:(1)广泛使用金属电极,极大地削弱了纸的本征优势.(2)传感机理受限于单一触觉感知功能,... 近年来,伴随可穿戴电子设备与日俱增的需求,成本低廉、绿色环保、可批量生产的纸基传感器得以快速发展.然而,目前的纸基传感器仍有两大挑战亟待解决:(1)广泛使用金属电极,极大地削弱了纸的本征优势.(2)传感机理受限于单一触觉感知功能,难以满足多重刺激感知的需求.本文报道了一种基于聚吡咯(PPy)的电容-电阻双模式全纸基传感器.该器件能够感知接近和压力刺激,从而能够应用于人体运动的监测、接近物体的感知.此外,我们还借助该传感器实现了接触式和非接触式摩斯电码输入,并能实现两种模式下的准确区分.该接近-压力全纸基传感器结构简单,容易制造,在可穿戴设备和绿色电子等领域有着巨大潜力. 展开更多
关键词 纸基电子 聚吡咯 接近-压力传感器 可穿戴设备 人体运动监测
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Recent advances in memristors based on two-dimensional ferroelectric materials 被引量:2
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作者 Wenbiao Niu Guanglong Ding +6 位作者 Ziqi Jia Xin-Qi Ma JiYu Zhao kui zhou Su-Ting Han Chi-Ching Kuo Ye zhou 《Frontiers of physics》 SCIE CSCD 2024年第1期195-218,共24页
In this big data era, the explosive growth of information puts ultra-high demands on the data storage/computing, such as high computing power, low energy consumption, and excellent stability. However, facing this chal... In this big data era, the explosive growth of information puts ultra-high demands on the data storage/computing, such as high computing power, low energy consumption, and excellent stability. However, facing this challenge, the traditional von Neumann architecture-based computing system is out of its depth owing to the separated memory and data processing unit architecture. One of the most effective ways to solve this challenge is building brain inspired computing system with in-memory computing and parallel processing ability based on neuromorphic devices. Therefore, there is a research trend toward the memristors, that can be applied to build neuromorphic computing systems due to their large switching ratio, high storage density, low power consumption, and high stability. Two-dimensional (2D) ferroelectric materials, as novel types of functional materials, show great potential in the preparations of memristors because of the atomic scale thickness, high carrier mobility, mechanical flexibility, and thermal stability. 2D ferroelectric materials can realize resistive switching (RS) because of the presence of natural dipoles whose direction can be flipped with the change of the applied electric field thus producing different polarizations, therefore, making them powerful candidates for future data storage and computing. In this review article, we introduce the physical mechanisms, characterizations, and synthetic methods of 2D ferroelectric materials, and then summarize the applications of 2D ferroelectric materials in memristors for memory and synaptic devices. At last, we deliberate the advantages and future challenges of 2D ferroelectric materials in the application of memristors devices. 展开更多
关键词 two-dimensional ferroelectric materials synthesis strategies MEMRISTORS artificial synapses
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A new fabrication method for enhancing the yield of linear micromirror arrays assisted by temporary anchors
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作者 Xingchen Xiao Ting Mao +3 位作者 Yingchao Shi kui zhou Jia Hao Yiting Yu 《Microsystems & Nanoengineering》 SCIE EI CSCD 2024年第3期169-180,共12页
As one of the most common spatial light modulators,linear micromirror arrays(MMAs)based on microelectromechanical system(MEMS)processes are currently utilized in many fields.However,two crucial challenges exist in the... As one of the most common spatial light modulators,linear micromirror arrays(MMAs)based on microelectromechanical system(MEMS)processes are currently utilized in many fields.However,two crucial challenges exist in the fabrication of such devices:the adhesion of silicon microstructures caused by anodic bonding and the destruction of the suspended silicon film due to residual stress.To solve these issues,an innovative processing method assisted by temporary anchors is presented.This approach effectively reduces the span of silicon microstructures and improves the Euler buckling limit of the silicon film.Importantly,these temporary anchors are strategically placed within the primary etching areas,enabling easy removal without additional processing steps.As a result,we successfully achieved wafer-level,high-yield manufacturing of linear MMAs with a filling factor as high as 95.1%.Demonstrating superior capabilities to those of original MMAs,our enhanced version boasts a total of 60 linear micromirror elements,each featuring a length-to-width ratio of 52.6,and the entire optical aperture measures 5 mm×6 mm.The linear MMA exhibits an optical deflection angle of 20.4°at 110 Vdc while maintaining exceptional deflection flatness and uniformity.This study offers a viable approach for the design and fabrication of thin-film MEMS devices with high yields,and the proposed MMA is promising as a replacement for digital micromirror devices(DMDs,by TI Corp.)in fields such as spectral imaging and optical communication. 展开更多
关键词 MIRROR exceptional anodic
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Hollow-structured all-silicon terahertz metasurface supporting quasi-bound states in the continuum for refractive index based Auramine O concentration sensing
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作者 XIN TANG HAODUO JIA +7 位作者 LANBIN LI MING LI DAI WU kui zhou PENG LI WEIJUN WANG JITAO LI DINGYU YANG 《Photonics Research》 SCIE EI CAS CSCD 2024年第7期1574-1582,共9页
Quasi-bound states in the continuum (QBIC),with exceptionally high-Q factors and the local field enhancement effect,have found potential applications in matter sensing.Introducing the QBIC mechanism into terahertz(THz... Quasi-bound states in the continuum (QBIC),with exceptionally high-Q factors and the local field enhancement effect,have found potential applications in matter sensing.Introducing the QBIC mechanism into terahertz(THz) metasurfaces can significantly enhance the interaction between incident THz waves and matter,providing a feasible platform for the detection of biochemical substances.Currently,most experimental studies on terahertz QBIC metasurfaces utilize metallic structures.By contrast,research on terahertz all-dielectric QBIC metasurfaces generally remains at the simulation stage due to the high fabrication process requirements,and transitioning to the experimental stage still poses many challenges.In this paper,a hollow-structured all-silicon metasurface supporting THz QBIC is proposed.The resonance of THz QBIC is excited via a simple hollow structure and observed in experiment.Simulations and experimental results demonstrated that the designed THz QBIC metasurface can achieve sensing of Auramine O.Notably,it is the first study,to our knowledge,to employ a metasurface to sense Auramine O.Additionally,the sensing performance maintains good stability under different humidity and temperature conditions.This study provides new references and insights for the design and implementation of THz QBIC,and also opens a new pathway for the detection of Auramine O. 展开更多
关键词 SUPPORTING CONTINUUM refractive
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关于“高利贷”能否入罪的研究
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作者 汪魏 隗宙 《互联网金融法律评论》 2017年第4期118-124,共7页
自人类社会出现商品经济之后,出于逐利的本性,高利贷就始终存在,对高利贷的道德评价和批判也时常出现,进而对高利贷进行法律规制的呼声也时有出现。关于高利贷的讨论最近引起全社会和法律界的特别关注,主要原因在于近来媒体集中报道和... 自人类社会出现商品经济之后,出于逐利的本性,高利贷就始终存在,对高利贷的道德评价和批判也时常出现,进而对高利贷进行法律规制的呼声也时有出现。关于高利贷的讨论最近引起全社会和法律界的特别关注,主要原因在于近来媒体集中报道和舆论热炒了校园贷、现金贷、消费贷等具有高利率属性的金融活动。高利率、不当催收以及相关人身伤害案件等话题足够地引人注意,甚至引发舆情抨击。鉴于现象集中爆发之严重。 展开更多
关键词 金融机构 最高人民法院 贷款利率 利率上限 高利贷 民间借贷案件
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