检索结果-南通市图书馆

Ferroelectric-controlled graphene plasmonic surfaces for all-optical neuromorphic vision

Science China(Technological Sciences) 2024年第3期67卷 765-773页

作者： CHEN JianBo LIU Yu LI ShangDong LIN Lin LI YaDong HUANG Wen guo junxiong School of Electronic Information and Electrical Engineering Institute for Advanced StudyChengdu UniversityChengdu 610106China School of Integrated Circuits Tsinghua UniversityBeijing 100084China School of Integrated Circuits(National Exemplary Schoolof Microelectronics) Universityof Electronic Science and Technologyof China Chengdu 610054China Jincheng Research Institute of Opto-mechatronics Industry Jincheng 048000China Shanxi Key Laboratory of Advanced Semiconductor Optoelectronic Devices and Integrated Systems Jincheng 048000China Engineering Research Center of Digital Imaging and Display Ministry of EducationSoochow UniversitySuzhou 215006China

Artificial visual systems can recognize desired objects and information from complex environments, and are therefore highly desired for pattern recognition, object detection, and imaging applications. However, state-of-the-art artificial visual systems with high recognition performances that typically consist of electronic devices face the challenges of requiring huge storage space and high power consumption owing to redundant data. Here, we report a terahertz(THz) frequency-selective surface using a graphene split-ring resonator driven by ferroelectric polarization for efficient visual system applications. The downward polarization of the ferroelectric material offers an ultrahigh electrostatic field for doping p-type graphene with an anticipated Fermi level. By optimizing the geometric parameters of the devices and modulating the carrier behaviors of graphene, our plasmonic devices exhibit a tunable spectral response in a range of 1.7–6.0 THz with continuous transmission values. The alloptical neural network using graphene plasmonic surfaces designed in this study exhibited excellent performance in visual preprocessing and convolutional filtering and achieved an ultrahigh recognition accuracy of up to 99.3% in training the Modified National Institute of Standards and Technology(MNIST) handwritten digit dataset. These features demonstrate the great potential of graphene plasmonic devices for future smart artificial vision systems.

关键词： graphene plasmon ferroelectric frequency selective surface artificial vision system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced-performance self-powered photodetector based on multi-layer MoS_(2) sandwiched between two asymmetric graphene contacts

引用

Science China(Technological Sciences) 2022年第11期65卷 2658-2666页

作者： guo junxiong LI ShangDong LIN Lin CAI Ji CHEN JianBo WANG ShiCai GOU Xin YE JingHua LUO ZhengHua HUANG Wen School of Electronic Information and Electrical Engineering Chengdu UniversityChengdu 610106China School of Electronics and Information Technology(School of Microelectronics) Sun Yat-sen UniversityGuangzhou 510006China School of Electronic Science and Engineering(National Exemplary School of Microelectronics).University of Electronic Science and Technologyof China Chengdu 610054China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China Sichuan Time Frequency Synchronization System and Application Engineering Technology Research Center Chengdu 610062China

Self-powered photodetectors can convert light into electrical signals without external power input and are widely used in applications such as imaging,sensing,communication,and *** most popular approach for constructing a self-powered photodetector is typically based on the fabrication of an asymmetric metal-semiconductor(MS)contact;however,this technique is seriously limited by the Fermi-level pinning ***,we report a room-temperature photodetector based on multi-layer MoS_(2) sandwiched between two separated asymmetric graphene *** photodetector was driven by the built-in electric field generated by a van der Waals(vd W)contact instead of the traditional MS *** under zero-bias voltage,the highest photoresponsivity of 0.63 AW^(-1) and a specific detectivity of 7.71×10^(12) Jones were achieved at a wavelength of 450 nm with 0.08μW cm^(-2) incident power *** with devices using symmetric contacts,a high ON/OFF current ratio of approximately 1520 and a fast response time on the order of microseconds were also observed in our asymmetric graphene contact *** experimental results may open a novel way toward the realization of vd W contacts for the fabrication of selfpowered photodetectors.

关键词： MoS_(2) graphene self-powered photodetector asymmetric contact

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced-performance self-powered photodetector based on multi-layer MoSsandwiched between two asymmetric graphene contacts

引用

Science China Technological Sciences 2022年

作者： guo junxiong LI ShangDong LIN Lin CAI Ji CHEN JianBo WANG ShiCai GOU Xin YE JingHua LUO ZhengHua HUANG Wen Sichuan Time Frequency Synchronization System and Application Engineering Technology Research Center College of Materials Science and Engineering Sichuan University School of Electronics and Information Technology (School of Microelectronics) Sun Yat-sen University School of Electronic Science and Engineering (National Exemplary School of Microelectronics) University of Electronic Science and Technology of China School of Electronic Information and Electrical Engineering Chengdu University

Self-powered photodetectors can convert light into electrical signals without external power input and are widely used in applications such as imaging, sensing, communication, and security. The most popular approach for constructing a self-powered photodetector is typically based on the fabrication of an asymmetric metal-semiconductor(MS) contact; however, this technique is seriously limited by the Fermi-level pinning effect. Here, we report a room-temperature photodetector based on multi-layer MoSsandwiched between two separated asymmetric graphene contacts. Our photodetector was driven by the built-in electric field generated by a van der Waals(vdW) contact instead of the traditional MS contact. Operating under zero-bias voltage, the highest photoresponsivity of 0.63 A Wand a specific detectivity of 7.71×10Jones were achieved at a wavelength of 450 nm with 0.08 μW cmincident power intensity. Compared with devices using symmetric contacts, a high ON/OFF current ratio of approximately 1520 and a fast response time on the order of microseconds were also observed in our asymmetric graphene contact device. Our experimental results may open a novel way toward the realization of vdW contacts for the fabrication of selfpowered photodetectors.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

One-step fabrication of TiO2/graphene hybrid mesoporous film with enhanced photocatalytic activity and photovoltaic performance

引用

Chinese Journal of Catalysis 2020年第8期41卷 1208-1216页

作者： junxiong guo Yiyi Li Shangdong Li Xumei Cui Yu Liu Wen Huang Linna Mao Xiongbang Wei Xiaosheng Zhang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Electronic Science and Engineering(National Exemplary School of Microelectronics)University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu 610225SichuanChina Institute of Microelectronics Tsinghua National Laboratory for Information Science and Technology(TNList)Tsinghua UniversityBeijing 100084China

We synthesized a mesoporous film based on TiO2-reduced graphene oxide(RGO)hybrids using a one-step vapor-thermal method without the need for an additional annealing *** vapor-thermally prepared TiO2-graphene hybrid(VTH)features unique structures with an ultra-large specific surface area of^260 m^2 g^-1 and low aggregation,giving rise to enhanced light harvesting and increased charge generation and separation *** was observed that a mesoporous film with uniform pore distribution is simultaneously obtained during the VTH growth *** a 5.0 wt%RGO VTH film was used as the active layer in photocatalysis,the highest photocatalytic activity for degradation of methyl orange was *** another,when a 0.75 wt%RGO VTH film was used as the photoanode in a dye-sensitized solar cell,the power conversion efficiency reached 7.58%,which represents an increase of 73.1%compared to a solar cell using an a photoanode of pure TiO2 synthesized by a traditional solvothermal *** is expected that this facile method for the synthesis of TiO2/graphene hybrid mesoporous films will be useful in practical applications for preparing other metal oxide/graphene hybrids with ultra-high photocatalytic activity and photovoltaic performance.

关键词： TiO2-graphene hybrid Catalytic activity Photoanode Vapor-thermal method Mesoporous film

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

极坐标变换及其奇性

引用

上海建材学院学报 1990年第1期3卷 55-59页

作者：郭俊雄上海建材学院

本文讨论用极坐标变换将轴对称Poisson方程及重调和方程的定解问题化归为常微分方程后,通过极坐标变换在r=0处的奇性分析给出这些方程'补充条件'的一般推导方法。从而为力学工作者在解决这一类实际问题时提供一个正确的途径。

关键词：极坐标变换奇性分析数学物理

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

合同能源管理项目评价

引用

北京理工大学学报（社会科学版） 2011年第1期3卷 11-14页

作者：尚天成郭俊雄天津大学管理学院天津300072

为促进合同能源管理模式的顺利实施,针对我国现有合同能源管理项目实施过程中,节能政策与法规不健全、市场信息不对称、融资困难、缺乏对项目实施与运行维护的有效管理、节能收益预测不准确或分配不合理等问题,构建合同能源管理项目评... 详细信息

为促进合同能源管理模式的顺利实施,针对我国现有合同能源管理项目实施过程中,节能政策与法规不健全、市场信息不对称、融资困难、缺乏对项目实施与运行维护的有效管理、节能收益预测不准确或分配不合理等问题,构建合同能源管理项目评价指标体系:包括资金、经营、政策、市场、收益5个一级指标,融资渠道、EPC项目管理能力、银行利率调整、能源价格变化、节能企业支付风险等22个二级指标。提出运用熵权法对层次分析法的评价指标权重进行改进,通过确定组合权重进行评价。

关键词：熵权法层次分析法合同能源管理节能服务公司

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

浅谈园林树木栽植后的养护管理措施

引用

农业技术与装备 2020年第12期 131-131,133页

作者：郭俊雄福建大农景观建设有限公司福建漳州363000

在城市生态文明建设中,园林树木的养护管理是重要的基础之一。文章探讨城市生态文明建设中园林树木的养护管理措施,并以松树为例,提出解决当前绿色城市建设中存在问题的具体策略,更好地服务于我国的园林绿化工作。

关键词：园林生态文明建设树木养护管理

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

留数计算规则的推广

引用

上海建材学院学报 1993年第4期6卷 324-329页

作者：郭俊雄上海建材学院基础课部

本文以 Laurant 展式为工具导出了一个应用十分广泛的留数计算规则。

关键词：留数复变函数计算规则

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

建筑加固中钢筋形变参数的对比分析

引用

科技通报 2013年第5期29卷 83-86页

作者：林洁伍朝阳郭俊雄重庆建筑工程职业学院重庆400039

研究建筑加固中钢筋形变参数对比分析的方法。假设不对建筑进行加固,则钢筋承受的外力作用较大,将造成钢筋发生比较严重的形变,从而影响建筑质量。为了避免上述缺陷,提出了一种基于最大熵方法的建筑加固中钢筋形变参数计算方法。根据钢... 详细信息

研究建筑加固中钢筋形变参数对比分析的方法。假设不对建筑进行加固,则钢筋承受的外力作用较大,将造成钢筋发生比较严重的形变,从而影响建筑质量。为了避免上述缺陷,提出了一种基于最大熵方法的建筑加固中钢筋形变参数计算方法。根据钢筋承受的各种不同的外力,建立钢筋形变力学模型。利用最大熵方法,计算建筑加固中钢筋形变参数。根据上述方法能够计算建筑加固中钢筋形变参数,从而完成钢筋形变参数对比分析。实验结果表明,建筑加固能够有效降低建筑物中钢筋的形变程度,从而保证建筑物的质量。

关键词：建筑加固钢筋形变最大熵

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

论抛物型方程初—边值问题和初值问题解法的统一性

引用

上海建材学院学报 1992年第1期5卷 128-135页

作者：邵善根郭俊雄大庆石油学院上海建材学院

本文尝试将抛物型方程初—边值问题中的初始函数在相应的本征函数族下展开成为 Fourier 级数,把初始函数延拓到整个数轴,把初—边值问题转化成为初值问题,从而使这两类不同的定解问题的解法统一起来。

关键词：抛物型方程本征值本征函数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：