检索结果-内蒙古大学图书馆

Multi-sensor data fusion technology for the early landslide warning system

Journal of Ambient Intelligence and Humanized Computing 2023年第8期14卷 11165-11172页

作者： Chen, Musheng Cai, Zhishan Zeng, Yongxi Yu, Yanzhong College of Physics and Information Engineering Quanzhou Normal University Quanzhou China Fujian Provincial Key Laboratory of Functional Materials for Informatics Fujian Quanzhou China Fujian Provincial Key Laboratory for Advanced Micro-Nano Photonics Technology and Devices Fujian Quanzhou China

The triggering threshold is one of the most important methods for early warning of landslide disasters. And the traditional method is to conduct a simple comparative analysis of the data collected at each monitoring point, which cannot take full advantage of the information provided by the data. In order to overcome this setback and improve the accuracy of the early warning, rainfall detector, global navigation satellite system and deep displacement sensor are used to detect external factors and internal states that cause landslides. Then, on this basis, a new data fusion technology based on the generalized evidence theory is proposed in this paper. Firstly, the system collects information from different sensors and transmits them to the landslide probability. Considering that the landslide is a gradual process, a new method is used to convert the landslide probability into the basic probability assignment for intuitionistic fuzzy sets. Then, the fuzzy divergence measure is used to calculate the uncertainly of evidence, which expresses the relative importance of the evidence. Next, the ultimate weight of each sensor is applied to adjust the mass function and gain the reliability. Finally, the system makes a final decision according to fusion results based on the generalized evidence theory. Three types of multi-sensors data were used to test the performance of the proposed algorithm. Comparing with other four fusion method, the proposed method has a better performance, which can increase the basic probability assignments from 0.73 to 0.92. Moreover, the proposed model achieved when dealing data with high degree of conflict. The simulation results showed that the proposed method could reduce the uncertainly and get a more comprehensive and integrated decision for the early landslide warning system. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Landslides

来源：评论

学校读者我要写书评

暂无评论

Research on insect recognition method based on convolutional neural network 15

Research on insect recognition method based on convolutional...

引用

15th International Conference on Graphics and Image Processing, ICGIP 2023

作者： Wu, Fan Chen, Musheng Tang, Linlin Wei, Qingxian Li, Xuandong College of physics and information engineering Quanzhou Normal University Fujian362000 China Fujian provincial key laboratory of functional materials for informatics Fujian362000 China Fujian provincial key laboratory of advanced micro-nano photonics technology and devices Fujian362000 China

ISBN: (纸本)9781510675018

Agricultural and forestry injurious insects have the characteristics of numerous varieties, huge adverse effects and strong explosive power, which has a great impact on the growth of crops. Therefore, it is of great significance to correctly identify insects and give their characteristics and killing methods. A insect recognition method based on convolutional neural network is studied in this paper. Firstly, the network structures AlexNet and ResNet of the convolutional neural network are built and analyse. Then,by training and testing through datasets of seven types of insect,the results show that the ResNet network with better recognition effect is selected, whose recognition accuracy of the testing dataset reaches 96.2%.At last,by rotating, scaling, damaging and blurring the photos of part of the testing dataset, it is found that the average recognition accuracy of ResNet reaches 94.67%, indicating that ResNet has strong anti-interference ability and can be used as an effective insect recognition algorithm. © 2024 SPIE. All rights reserved.

关键词： Image recognition

来源：评论

学校读者我要写书评

暂无评论

A high-precision system of fiber Bragg grating temperature sensing demodulation based on light power detection

引用

Optoelectronics Letters 2022年第8期18卷 461-467页

作者： HUANG Shuyan HU Xiaohua ZHANG Hao CHEN Weijuan HUANG Youping FAN Mengyi Department of Electronic Information Science Fujian Jiangxia UniversityFuzhou 350108China University of Chinese Academy of Sciences Beijing 100059China Fujian Provincial Key Laboratory for Advanced Micro-nano Photonics Technology and Devices Quanzhou Normal UniversityQuanzhou 362000China

A system of fiber Bragg grating(FBG)temperature sensing demodulation based on light power detection is proposed in this *** with the traditional demodulation method based on wavelength scanning,light power detection is more direct and avoids the use of ***,the light power in the system is converted into the electrical signal by the receiver optical subassembly(ROSA)and converted to the digital *** micro controller unit(MCU)processes the digital signal to realize the real-time temperature monitoring,which avoids the use of optical power meter(OPM).With the advantages of simple structure and low cost,the system is portable and *** experimental results show that the linearity coefficients R-square between light power and the sampling voltage are 0.99908 and 0.99893 in the temperature range from 10°C to 85°C,*** to the results,the proved sensor has a repeatability error of 1%,a linearity error of 1.35%,and a hysteresis error of 0.7%,which indicates that the system is of high stability and high *** experimental results are consistent with the theory,which verifies the system’s feasibility.

关键词： system power fiber

来源：评论

学校读者我要写书评

暂无评论

Design of the Telecentric Lens for Two Adjacent Surfaces Simultaneous Imaging of Semiconductor Thermo Electric Cooler (TEC) Components 3

Design of the Telecentric Lens for Two Adjacent Surfaces Sim...

引用

3rd International Conference on Optics and Communication technology, ICOCT 2023

作者： Chen, Xiaohui Wang, Xinsen Duan, Yafan Yang, Cheng Liao, Tingdi Quanzhou Normal University Research Center for Photonics Technology Quanzhou362000 China Fujian Provincial Key Laboratory for Advanced Micro-nano Photonics Technology and Devices Quanzhou362000 China Fujian Provincial Collaborative Innovation Center for Ultra-Precision Optical Engineering and applications Quanzhou362000 China Fujian Normal University Fuzhou350007 China

ISBN: (纸本)9781510672529

With the progress of science and technology and the development of industrial automation, the machine vision technology is widely used in the field of industrial automation detection. Especially the size measurement and surface defects detection of some small particles, the machine vision has clear advantages in precision than human eyes. The application of machine vision is developing towards lager magnification and high resolution. Therefore, the matching lens is needed for this application. Aiming at the needs of multi-surface detection of semiconductor thermoElectric cooler (TEC) components, this paper describes a design of a telecentric lens. Using the telecentric lens, two adjacent surfaces of the TEC components can be imaged simultaneously. This lens includes two right angle prisms, a cubic beam splitter, five lenses and a cemented doublet. Its magnification is -1.5 and and the focal length is 65mm. The maximum distortion of the lens is controlled within 0.2% and the MTF is greater than 0.4 at 100lp/mm. The lens can be adapted to 2/3 "CCD, which can meet the requirements of machine vision detection. Through tolerance analysis, this lens has good tolerance and high cost performance. © 2023 SPIE.

关键词： Optical design

来源：评论

学校读者我要写书评

暂无评论

Three-wavelength Mode Converter Based on Three-cascaded Tilted Sampled Bragg Gratings

Three-wavelength Mode Converter Based on Three-cascaded Tilt...

引用

2021 International Conference on Optical Instruments and technology: Optical Communication and Optical Signal Processing

作者： Zeng, Xintao Ma, Yuxin Hong, Ziming Wang, Hongji Wu, Pinghui Shi, Yuechun Chen, Xiangfei Fujian Provincial Key Laboratory for Advanced Micro-nano Photonics Technology and Devices Quanzhou Normal University Quanzhou362000 China Microwave-Photonics Technology Laboratory Nanjing National Laboratory of Microstructures College of Engineering and Applied Sciences Nanjing University Nanjing210093 China

ISBN: (纸本)9781510655614

By expanding the reconstruction-equivalent-chirp (REC) technique into two-Dimensional (2D) grating, we designed a three-wavelength mode converter with three-cascaded tilted sampled Bragg gratings (3C-TSBG). Theoretical simulation results show that the presented 3C-TSBG can realize three-wavelength conversion between the fundamental transverse electric mode (TE0) and the first-order transverse electric mode (TE1). In addition, the mode-conversion wavelength can be tuned by changing the period and tilted angle of the cascaded sampled gratings. More importantly, compared with the cascaded tilted Bragg gratings (C-TBG), the 3C-TSBG can improved the error tolerance and wavelength control accuracy. Therefore, the proposed 3C-TSBG has potential applications in reconfigurable mode-division-multiplexing communication systems and other areas where programmable mode conversion is required. © 2022 SPIE.

关键词： Finite difference time domain method

来源：评论

学校读者我要写书评

暂无评论

An optical apparatus for inspecting adjacent surfaces defects of TEC components with equal-optical-path confocal imaging using optical wedge prisms 2

An optical apparatus for inspecting adjacent surfaces defect...

引用

2nd International Congress on Optics, Electronics and Optoelectronics, ICOEO 2021

作者： Shaobin, Yan Yafan, Duan Qilu, Huang Heng, Zheng Yantang, Huang Tingdi, Liao Research Center For Photonics Technology Quanzhou Normal University Fujian Quanzhou362000 China Fujian Provincial Key Laboratory For Advanced Micro-nano Photonics Technology And Devices Fujian Quanzhou362000 China Fujian Prov. Collab. Innov. Center For Ultra-Precision Optical Engineering And Applications Fujian Quanzhou362000 China

An optical apparatus with equal-optical-path confocal imaging has been proposed for simultaneously inspecting adjacent surfaces defects of thermoelectric cooler (TEC) components. The equal-optical-path confocal imaging of two adjacent surfaces with the desired separation can be obtained by using two optical wedges in the two optical imaging paths respectively. The optical apparatus has been designed and experimental investigations on defects inspection of two adjacent surfaces of TEC components have been conducted. The results showed that the proposed optical apparatus allows one to simultaneously inspect the defects of adjacent surfaces of TEC components. It was concluded that the optical apparatus can meet the technical requirements for inspecting adjacent surfaces defects of TEC components. The apparatus has advantages of freedom for imaging adjustment, increased inspection accuracy and improved system reliability etc. It has been found applications in the intelligent defects inspection system of TEC components. © Published under licence by IOP Publishing Ltd.

关键词： Inspection

来源：评论

学校读者我要写书评

暂无评论

Waveguide-integrated optical modulators with two-dimensional materials

引用

Journal of Semiconductors 2023年第11期44卷 8-25页

作者： Haitao Chen Hongyuan Cao Zejie Yu Weike Zhao Daoxin Dai State Key Laboratory for Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Waveguide-integrated optical modulators are indispensable for on-chip optical interconnects and optical *** cope with the ever-increasing amount of data being generated and consumed,ultrafast waveguide-integrated optical modulators with low energy consumption are highly *** recent years,two-dimensional(2D)materials have attracted a lot of attention and have provided tremendous opportunities for the development of high-performance waveguide-integrated optical modulators because of their extraordinary optoelectronic properties and versatile *** paper reviews the state-of-the-art waveguide-integrated optical modulators with 2D materials,providing researchers with the developing trends in the field and allowing them to identify existing challenges and promising potential ***,the concept and fundamental mechanisms of optical modulation with 2D materials are ***,a review of waveguide-integrated optical modulators employing electro-optic,all-optic,and thermo-optic effects is ***,the challenges and perspectives of waveguide-integrated modulators with 2D materials are discussed.

关键词： optical modulation two-dimensional(2D)materials on-chip waveguide

来源：评论

学校读者我要写书评

暂无评论

Mid-infrared period doubled solitons in a few-mode fluoride fiber oscillator

Mid-infrared period doubled solitons in a few-mode fluoride ...

引用

2024 advanced Fiber Laser Conference, AFL 2024

作者： Yang, Ying Ma, Shuanglong Chen, Zifeng Luo, Xing Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Period doubling bifurcation (PDB) phenomenon, which is prevalent in nonlinear systems, has attracted considerable attention because of its potential application value. As an ideal platform for studying the pulse dynamics of nonlinear systems, the mode-locked fiber laser has been intensively investigated in the near-infrared (NIR) spectral region. However, there is a paucity of relevant reports of pulse dynamics in the mid-infrared (MIR) spectral region. Especially for the MIR large-mode-area (LMA) fluoride fiber oscillator, the existence of multiple transverse modes and a new spatial degree of freedom makes the pulse dynamics phenomenon is more complex, which needs to be further explored. In this paper, a soliton regime with a pulse duration of 404.5 fs, repetition frequency of 45.02 MHz, and average output power of 105.3 mW is obtained in a few-mode fluoride fiber oscillator mode-locked by the nonlinear polarization rotation (NPR) technique. By merely increasing the power of the pump, a period doubled soliton with the pulse intensity varying between two different values can be obtained. This work facilitates a more profound comprehension of the nonlinear dynamics in the mid-infrared multimode fluoride fiber laser, and opens up new opportunities for the chaos, optical frequency combs and all-optical modulation. © 2025 SPIE.

关键词： Infrared devices

来源：评论

学校读者我要写书评

暂无评论

Five-user quantum virtual local area network with an AlGaAs entangled photon source

引用

Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 61-73页

作者： Cheng Qian Hongkai Tian Xu Jing Yichen Liu Zhe Chen Huiran Luo Yuan Du Xiaodong Zheng Tangsheng Chen Yuechan Kong Hua-Lei Yin Dong Jiang Bin Niu Liangliang Lu Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities School of Physical Science and TechnologyNanjing Normal UniversityNanjing210023China School of Internet Anhui UniversityHefei230039China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing Chip Valley Industrial Technology InstituteNanjing Electronic Devices InstituteNanjing210016China Research Center for Quantum Optics and Quantum Communication School of ScienceQingdao University of TechnologyQingdao266520China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing100872China Beijing Academy of Quantum Information Sciences Beijing100193China National Engineering Research Center of Agro-Ecological Big Data Analysis and Application Anhui UniversityHefei230601China National Laboratory of Solid-State Microstructures and School of Physics Nanjing UniversityNanjing210093China Hefei National Laboratory Hefei230088China

The promotion of quantum network applications demands the scalable connection of quantum *** is preferable to set up multiple logical networks coexisting on a single physical network infrastructure to accommodate a larger number of *** we present a quantum virtual network architecture that offers this level of scalability,without being constrained to a fixed physical-layer network relying solely on passive multiplexing *** architecture can be understood as arising from the superposition of a fully connected entanglement distribution network and port-based virtual local area network,which group multiusers by access *** terms of hardware,we leverage a semiconductor chip with a high figure-of-merit modal overlap to directly generate high-quality polarization entanglement,and a streamlined polarization analysis module,which requires only one single-photon detector for each end *** experimentally perform the BBM92 QKD protocol on the five-user quantum virtual network and demonstrate voice and image encryption on a campus area *** results may provide insights into the realization of large-scale quantum networks with integrated and cost-efficient photonic architecture.

关键词： quantum network quantum entanglement distribution integrated photonics image and voice encryption

来源：评论

学校读者我要写书评

暂无评论

KCl acts as a flux to assist the growth of sub-millimeter-scale metallic 2D non-layered molybdenum dioxide

引用

Rare Metals 2025年第1期44卷 404-416页

作者： Li-Ying Deng Qing Zhang Wang-Yang Li Xiao-Yuan Ye Yi-Fan Zhao Shen-Zhong Chen Yu-Lan Wang Xing-Hui Wang Hui-Peng Chen Zhi-Yang Yu Qun Yan Shu-Ying Cheng Tai-Liang Guo Wen-Ping Hu Feng Ding Jie Sun National and Local United Engineering Laboratory of Flat Panel Display Technology College of Physics and Information EngineeringFuzhou UniversityFuzhou350100China Fujian Key Laboratory of Agricultural Information Sensing Technology College of Mechanical and Electrical EngineeringFujian Agriculture and Forestry UniversityFuzhou350002China Key Laboratory of Organic Integrated Circuit Department of ChemistrySchool of ScienceMinistry of Education and Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityTianjin300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin300072China College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhou350108China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou350116China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518000China

Two-dimensional(2D)metal oxides(2DMOs),such as MoO_(2),have made impressive strides in recent years,and their applicability in a number of fields such as electronic devices,optoelectronic devices and lasers has been ***,2DMOs present challenges in their synthesis using conventional methods due to their non-van der Waals *** report that KCl acts as a flux to prepare large-area 2DMOs with sub-millimeter *** systematically investigate the effects of temperature,homogeneous time and cooling rate on the products in the flux method,demonstrating that in this reaction a saturated homogenous solution is obtained upon the melting of the salt and ***,the cooling rate was adjusted to regulate the thickness of the target crystals,leading to the precipitation of 2D non-layered material from the supersaturated solution;by applying this method,the highly crystalline non-layered 2D MoO_(2)flakes with so far the largest lateral size of up to sub-millimeter scale(~464μm)were *** studies have revealed that the 2D MoO_(2)features metallic properties,with an excellent sheet resistance as low as 99Ω·square^(-1 )at room temperature,and exhibits a property of charge density wave in the measurement of resistivity as a function of temperature.

关键词： 2D non-layered materials Metallic Metal oxide Thickness modulation Flux method

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：