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LLTH‑YOLOv5:A Real‑Time Traffic Sign Detection Algorithm for Low‑Light Scenes

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Automotive Innovation 2024年第1期7卷 121-137页

作者： Xiaoqiang Sun kuankuan Liu Long chen Yingfeng Cai Hai Wang Automotive Engineering Research Institute Jiangsu UniversityZhenjiang 212013China School of Automotive and Traffic Engineering Jiangsu UniversityZhenjiang 212013China

Traffic sign detection is a crucial task for autonomous driving ***,the performance of deep learning-based algorithms for traffic sign detection is highly affected by the illumination conditions of *** existing algo-rithms demonstrate high accuracy in well-lit environments,they suffer from low accuracy in low-light *** paper proposes an end-to-end framework,LLTH-YOLOv5,specifically tailored for traffic sign detection in low-light scenarios,which enhances the input images to improve the detection *** proposed framework comproses two stages:the low-light enhancement stage and the object detection *** the low-light enhancement stage,a lightweight low-light enhancement network is designed,which uses multiple non-reference loss functions for parameter learning,and enhances the image by pixel-level adjustment of the input image with high-order *** the object detection stage,BIFPN is introduced to replace the PANet of YOLOv5,while designing a transformer-based detection head to improve the accuracy of small target ***,GhostDarkNet53 is utilized based on Ghost module to replace the backbone network of YOLOv5,thereby improving the real-time performance of the *** experimental results show that the proposed method significantly improves the accuracy of traffic sign detection in low-light scenarios,while satisfying the real-time requirements of autonomous driving.

关键词： Deep learning Traffic sign detection Low-light enhancement YOLOv5 Object detection

Biomimetic Integrated Nanozyme for Flare and Recurrence of Gouty Arthritis

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Asian Journal of Pharmaceutical Sciences 2024年第3期19卷 131-145页

作者： Rui Wang Tongyao Liu Xinhong Li Enhao Lu Yiting chen kuankuan Luo Tao Wang Xueli Huang Zhiwen Zhang Shilin Du Xianyi Sha Key Laboratory of Smart Drug Delivery(Ministry of Education) Institutes of Integrative MedicineDepartment of PharmaceuticsSchool of PharmacyFudan UniversityShanghai 201203China Department of Emergency Medicine Shanghai Geriatric Medical CenterShanghai 201104China Department of Emergency Medicine Zhongshan HospitalFudan UniversityShanghai 200032China

Flare and multiple recurrences pose significant challenges in gouty *** treatments provide temporary relief from inflammation but fail to promptly alleviate patient pain or effectively prevent subsequent *** should also be noted that both anti-inflammation and metabolism of uric acid are necessary for gouty arthritis,calling for therapeutic systems to achieve these two goals *** this study,we propose a biomimetic integrated nanozyme,HMPB-Pt@MM,comprising platinum nanozyme and hollow Prussian *** demonstrates anti-inflammatory properties by eliminating reactive oxygen species and reducing infiltration of inflammatory ***,it rapidly targets inflamed ankles through the camouflage of macrophage ***,HMPB-Pt@MM exhibits urate oxidase-like capabilities,continuously metabolizing locally elevated uric acid concentrations,ultimately inhibiting multiple recurrences of gouty *** summary,HMPB-Pt@MM integrates ROS clearance with uric acid metabolism,offering a promising platform for the treatment of gouty arthritis.

关键词： Gouty arthritis Inflammation Nanozyme Platinum Prussian blue

Narrow-linewidth thermally tuned multi-channel interference widely tunable semiconductor laser with thermal tuning power below 50 mW

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Photonics Research 2020年第5期8卷 671-676页

作者： QUANAN chen CHUN JIANG kuankuan WANG MIAO ZHANG XIANG MA YE LIU QIAOYIN LU WEIHUA GUO Wuhan National Laboratory for Optoelectronics&School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

A thermally tuned multi-channel interference widely tunable semiconductor laser is designed and demonstrated,for the first time to our knowledge,that realizes a tuning range of more than 45 nm,side-mode suppression ratios up to 56 d B,and Lorentzian linewidth below 160 k *** Ga In As multiple quantum wells(MQWs)were used to reduce linewidth,which have a lower linewidth enhancement factor compared with In Ga As P *** decrease the power consumption of micro-heaters,air gaps were fabricated below the arm phase *** a 75μm long suspended thermal tuning waveguide,about 6.3 m W micro-heater tuning power is needed for a 2πround-trip phase *** micro-heater tuning power required is less than 50 m W across the whole tuning range,which is lower than that of the reported thermally tuned tunable semiconductor lasers.

关键词： tuning tunable power

The anti-windup controller design for multi-propeller aerostat based on nested saturation function

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The anti-windup controller design for multi-propeller aerost...

Nanofluidic osmotic power generation from CO_(2) with cellulose membranes

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作者： Dingshan Sun Li chen Guochang Zhang Yubin Wen kuankuan Liang Xiaoliang Wang Shanghai Jiao Tong University School of Aeronautics and Astronautics

This paper proposes two methods to describe the actuator amplitude and rate constraints with nested saturation function. The dynamic model of aerostat in the horizontal plane is established, and then the three order nested saturation controller is designed based on the nested saturation function. And as a result, the amplitude and rate of the actuator output are limited by the amplitude constraints of the nested function and the effectiveness of the control law is verified by simulation. The control quality is guaranteed by the state feedback controller. The advantage of the method is that the controller is simple and has strong ability to suppress disturbance.

关键词： Multi-propeller airship anti-saturation nested saturation function

来源： cnki会议评论

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Green Carbon 2023年第1期1卷 58-64页

作者： Chang chen Xueli Liu Renxing Huang kuankuan Liu Shangfa Pan Junchao Lao Qi Li Jun Gao Lei Jiang State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433PR China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101PR China Shandong Energy Institute Qingdao 266101PR China College of Materials Science and Engineering Institute of Marine Biobased MaterialsQingdao UniversityQingdao 266071PR China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190PRChina

The diffusion of chemical species down concentration gradient is a ubiquitous phenomenon that releases Gibbs free *** materials have shown great promise in harvesting the energy from ionic diffusion via the reverse electrodialysis *** principle,any chemicals that can be converted to ions can be used for nanofluidic power *** this work,we demonstrate the power generation from the diffusion of CO_(2) into air using nanofluidic cellulose *** dissolving CO_(2) in water,a power density of 87 mW/m^(2) can be *** monoethanolamine solutions to dissolve CO_(2),the power density can be increased to 2.6 W/m^(2).We further demonstrate that the waste heat released in industrial and carbon capture processes,can be simultaneously harvested with our nanofluidic membranes,increasing the power density up to 16 W/m^(2) under a temperature difference of 30°***,our work should expand the application scope of nanofluidic osmotic power generation and contribute to carbon utilization and capture technologies.

关键词： Nanofluidics Osmotic power generation CO_(2)utilization cellulose membranes waste heat utilization

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电位滴定法在沥青研究中的应用及展望

材料导报 2021年第23期35卷 23076-23088页

作者：王晓锋梁波陈玉凡张宽宽长沙理工大学交通运输工程学院长沙410114 公路养护技术国家工程实验室长沙410114

沥青的组成影响沥青路面的性能。环境和荷载使沥青组分的含量和结构发生变化,导致沥青老化、变硬变脆且粘结性降低,从而降低沥青路面的使用寿命。沥青老化分析技术的发展对研究沥青材料的老化、沥青的改性和老化沥青的再生具有重要意义... 详细信息

沥青的组成影响沥青路面的性能。环境和荷载使沥青组分的含量和结构发生变化,导致沥青老化、变硬变脆且粘结性降低,从而降低沥青路面的使用寿命。沥青老化分析技术的发展对研究沥青材料的老化、沥青的改性和老化沥青的再生具有重要意义。当前,应用广泛的傅里叶红外光谱法、凝胶渗透色谱法、原子力显微镜法及荧光显微镜法等在沥青的老化研究中均存在一定局限性,因此,发展一种新的研究方法至关重要。电位滴定法利用已知物质的量浓度的滴定剂对待测溶液中未知浓度的物质进行滴定,溶液中离子浓度变化程度的不同导致指示电极电位显示不同的电势。滴定终点前后,待测物质浓度发生明显改变,电位发生突跃,可根据电位突变时滴定剂的消耗量计算待测物质含量。对于给定的化学官能团,电极电位的变化是唯一的,并且与其浓度成比例。在沥青的检测中,该方法测试结果不受温度、沥青黑色背景、液体接界电位等因素的干扰,因此测试结果具有较高的准确性,适用于沥青组分研究。本文综合国内外研究成果,从监控沥青的老化过程及指导老化沥青的再生角度,综述了电位滴定法在沥青酸碱组分检测与分类中的应用、沥青组分与性能的关系、含水量和硫含量以及苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青中SBS含量检测方面的研究进展及其它电化学方法在沥青老化前后的物质检测中的研究现状。通过电位滴定法将沥青老化前后组分的变化与沥青的性能及老化沥青再生机理研究相结合,为沥青路面的耐久性研究提供科学依据。

关键词：道路工程电位滴定沥青组分老化再生 SBS含量

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热处理工艺对钢板组织性能的影响研究

机械科学与技术 2018年第9期37卷 1459-1464页

作者：陈琛张志伟单宽宽石启正上海海事大学物流工程学院上海201306 昂华自动化工程股份有限公司上海201315 中港疏浚有限公司上海200120

以海洋平台用Q690高强钢的热处理工艺开发为背景,在不改变材料成分的前提下,根据QP-T热处理新工艺,将普通高强钢的屈服强度和抗拉强度进行有效提升。利用软件对钢板的油淬和Q-P-T热处理工艺的温度场进行模拟,得到不同热处理工艺下温度... 详细信息

以海洋平台用Q690高强钢的热处理工艺开发为背景,在不改变材料成分的前提下,根据QP-T热处理新工艺,将普通高强钢的屈服强度和抗拉强度进行有效提升。利用软件对钢板的油淬和Q-P-T热处理工艺的温度场进行模拟,得到不同热处理工艺下温度随时间的变化规律,并通过模拟并比较不同热处理工艺下材料的组织成分和含量,确定最佳的热处理工艺。在热处理实验中用不同的热处理工艺处理原始材料,对比不同热处理工艺下材料的力学性能。实验验证得出,经Q-P-T工艺处理后的钢板的强塑积相对于其他工艺有较大的提升。研究结果表明Q-P-T钢组织由马氏体、残余奥氏体和弥散析出的碳化物组成,这些组织对提高钢的强塑积具有重要的意义。

关键词：海洋用高强钢 Q-P-T 热处理微观组织性能

多通道干涉大范围可调谐激光器控制系统(特邀)

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光子学报 2022年第2期51卷 80-89页

作者：陈子枫王宽宽蒋春陈泉安陆巧银国伟华华中科技大学武汉光电国家研究中心武汉430074

多通道干涉大范围可调谐半导体激光器是波分复用系统中的新型关键器件,设计了一套针对此激光器高精度电流注入、温度控制、波长锁定等问题的控制系统。将该激光器的整套控制方案集成单板。在该控制系统下,测试得到激光器输出波长在1524~... 详细信息

多通道干涉大范围可调谐半导体激光器是波分复用系统中的新型关键器件,设计了一套针对此激光器高精度电流注入、温度控制、波长锁定等问题的控制系统。将该激光器的整套控制方案集成单板。在该控制系统下,测试得到激光器输出波长在1524~1572 nm中每间隔0.4 nm的120个ITU标准波长光谱图,调谐范围超过48 nm,并且在整个调谐范围内,边模抑制比超过了45 dB,波长偏差与ITU标准波长相差小于±10 pm,线宽小于100 kHz。

关键词：调谐激光器波分复用微处理器温度控制波长锁定线宽

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多通道干涉大范围可调谐激光器的研究

中国激光 2020年第7期47卷 243-252页

作者：蒋春陈泉安王宽宽陆巧银国伟华华中科技大学武汉光电国家研究中心湖北武汉430074

提出了一种新型单片集成大范围可调谐半导体激光器——多通道干涉(MCI)激光器,采用多臂干涉进行选模,制作简单且容差大。基于电光效应调谐的MCI激光器波长调谐范围大于40 nm,在整个调谐范围内的边模抑制比(SMSR)大于40 dB,且激光器与半... 详细信息

提出了一种新型单片集成大范围可调谐半导体激光器——多通道干涉(MCI)激光器,采用多臂干涉进行选模,制作简单且容差大。基于电光效应调谐的MCI激光器波长调谐范围大于40 nm,在整个调谐范围内的边模抑制比(SMSR)大于40 dB,且激光器与半导体光放大器集成的器件出纤功率大于13 dBm。基于热光效应调谐的MCI激光器波长调谐范围大于45 nm,在整个调谐范围内的SMSR大于48 dB,线宽小于250 kHz,总的热调谐功耗低于50 mW。具体阐述了器件的理论设计、器件制作以及器件的测试。

关键词：激光器半导体激光器可调谐激光多通道