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Traffic safety helmet wear detection based on improved YOLOv5 network

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Optoelectronics Letters 2025年第1期21卷 35-42页

作者： gui Dongdong SUN Bo College of Software Southeast University Quanzhou Equipment Research Centre Haixi Institute Chinese Academy of Sciences

Aiming at the problem that the current traffic safety helmet detection model can't balance the accuracy of detection with the size of the model and the poor generalization of the model, a method based on improving you only look once version 5(YOLOv5) is proposed. By incorporating the lightweight Ghost Net module into the YOLOv5 backbone network, we effectively reduce the model size. The addition of the receptive fields block(RFB) module enhances feature extraction and improves the feature acquisition capability of the lightweight model. Subsequently, the high-performance lightweight convolution, GSConv, is integrated into the neck structure for further model size compression. Moreover, the baseline model's loss function is substituted with efficient insertion over union(EIoU), accelerating network convergence and enhancing detection precision. Experimental results corroborate the effectiveness of this improved algorithm in real-world traffic scenarios.

关键词： Traffic control

Offload Strategy for Edge Computing in Satellite Networks Based on Software Defined Network

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Computers, Materials & Continua 2025年第1期82卷 863-879页

作者： Zhiguo Liu Yuqing gui Lin wang Yingru Jiang Communication and Network Laboratory Dalian UniversityDalian116622China College of Environment and Chemical Engineering Dalian UniversityDalian116622China

Satellite edge computing has garnered significant attention from researchers;however,processing a large volume of tasks within multi-node satellite networks still poses considerable *** sharp increase in user demand for latency-sensitive tasks has inevitably led to offloading bottlenecks and insufficient computational capacity on individual satellite edge servers,making it necessary to implement effective task offloading scheduling to enhance user *** this paper,we propose a priority-based task scheduling strategy based on a Software-Defined Network(SDN)framework for satellite-terrestrial integrated networks,which clarifies the execution order of tasks based on their ***,we apply a Dueling-Double Deep Q-Network(DDQN)algorithm enhanced with prioritized experience replay to derive a computation offloading strategy,improving the experience replay mechanism within the Dueling-DDQN ***,we utilize the Deep Deterministic Policy Gradient(DDPG)algorithm to determine the optimal resource allocation strategy to reduce the processing latency of *** results demonstrate that the proposed d3-DDPG algorithm outperforms other approaches,effectively reducing task processing latency and thus improving user experience and system efficiency.

关键词： Satellite network edge computing task scheduling computing offloading

Synthesis, Crystal Structure and Calculated β Value of a Tetrahedral Zinc (II) Complex——Zn(2-NH_2py)_2Br_2

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Chinese Journal of Structural Chemistry 2002年第1期21卷 38-41页

作者： REN Peng a SU Nan-Bing a QIN Jin-gui a Michael w. Day b CHEN Chuang-Tianc ( aDepartment of Chemistry, wuhan University, wuhan 43007, China) ( bBeckman Institute, California Institute of Technology, Pasadena, CA91125, USAQ ) ( cBeijing R & D Center Department of Chemistry Wuhan University Wuhan 43007 Beckman Institute California Institute of Technology 美国 Pasadena Beijing R & D Center for Synthetic Crystals Chinese Academy of Sciences 北京 1000

A new zinc(II) complex, Zn(2-NH2py)2Br2 (py=pyridine), has been synthesized, and its molecular structure has been confirmed by IR, elemental analysis and -ray crystal structure analysis. Its space group is P21/n with Mr=413.43 (C10H12Br2N4Zn), a=7.435(2), b=12.865(3), c=14.186(4)? b=94.08(2)? V=1353.5(5) 3, Z=4, Dc=2.029 g/cm3, F(000)=328, ?2.378mm－1, R=0.0283, wR=0.0501. The total observed reflections with I≥2?I) were 5314, of which the independent reflections were 3106. The complex structure contains a distorted tetrahedron formed by four atoms coordinated to zinc atom, namely two bromide atoms and two nitrogen atoms. The two ZnBr bond lengths within one molecule, 2.3763(6) and 2.4002(5)? respectively, are not equal; and so are the two ZnN bond lengths, which are 2.031(2) and 2.044(2)?respectively. The calculation results using PM3 method through MOPAC software package in Chem 3D show that its first molecular hyperpolarizability b value is 5.210－30esu, which is comparable with that of p-nitroaniline. No bulk SHG effect has been detected due to the centrosymmetric space group.

关键词： zinc (II) complex synthesis crystal structure nonlinear optical material

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Efficient photocatalytic reduction of CO2 to formate by a molecular noble metal-free system

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Science China Chemistry 2025年第1期68卷 152-156页

作者： Lihua Zhang Lingjing Chen Huatian Shi Yue wei gui Chen Tai-Chu Lau School of Environment and Civil Engineering Research Center for Eco-environmental Engineering Dongguan University of Technology Department of Chemistry and Institute of Molecular Functional Materials City University of Hong Kong

Reducing CO2to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting CO2to a specific product beyond CO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce CO2to formate （HCOO-）.Turnover number （TON） for HCOO-up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole （BIH） as sacrificial reductant in a CO2-saturated NMP/TEA （v/v,3:1） solution under visible light *** potential electrolysis at-1.41 V （***/Ag Cl） in the presence of 12 m M Et3NHBF4also produced HCOO-with Faradaic efficiency of 39%.Spectroscopic and electrochemical studies suggest that a[CoI-H]species is the key intermediate for CO2reduction.

关键词： photocatalysis noble metal-free CO2 reduction formate cobalt hydride

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-gui Peng Peng wu Zong-Lin Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

Cooperative output regulation of heterogeneous directed multi-agent systems: a fully distributed model-free reinforcement learning framework

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Science China(Information Sciences) 2025年

作者： Xiongtao SHI Yanjie LI Chenglong DU Huiping LI Chaoyang CHEN weihua gui Guangdong Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics School of Mechanical Engineering and Automation Harbin Institute of Technology (Shenzhen) School of Automation Central South University School of Marine Science and Technology Northwestern Polytechnical University School of Information and Electrical Engineering Hunan University of Science and Technology

In this paper, the cooperative output regulation (COR) problem of a class of unknown heterogeneous multi-agent systems (MASs) with directed graphs is studied via a model-free reinforcement learning (RL) based fully distributed eventtriggered control (ETC) strategy. First, we consider the scenario that the exosystem is accessible globally to all agents, an internal model-based augmented algebraic Riccati equation (AARE) is constructed, and its solution is learned by the proposed model-free RL algorithm via online input-output data. Further, for the scenario that the exosystem is accessible only to its adjacent followers, the distributed observers are designed for each agent to get the state of the exosystem, and an internal modelbased fully distributed adaptive ETC protocol is then synthesized to construct the corresponding AARE, and the feedback gain matrix is learned in a model-free fashion. The model-free RL-based control protocol proposed in this paper can not only remove the prior knowledge of agents’ dynamics, but also release the dependence on global information by the adaptive event-triggered mechanism (ETM) and the new graph-based Lyapunov function. Finally, simulation results are illustrated to show the feasibility and effectiveness of the proposed control scheme.

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Melatonin prevents oxidized low-density lipoprotein induced increase of myosin light chain kinase activation and expression in HUVEC through ERK/MAPK signal transduction

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Melatonin prevents oxidized low-density lipoprotein induced ...

第四届全国血脂分析与临床学术研讨会暨第九届全国脂蛋白学术会议

作者： Zhou Q Zhu HQ Cheng Xw Xiao LL Jiang ZK gui SY wei w wang Y# Laboratory of Molecular Biology and Department of Biochemistry,Anhui Medical University (Hefei 230032)

Melatonin,the main secretary product of the pineal gland,is potentially effective in the prevention of a number of diseases in which free radical processes are *** development of hypercholesterolemia is a multifactori...

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《庄子》精神生态隐喻的英译叙事重构

东北师大学报（哲学社会科学版） 2025年第1期 134-142页

作者：周桂君林琳东北师范大学外国语学院吉林长春130024 沈阳化工大学外国语学院辽宁沈阳110142

隐喻言说是《庄子》话语特色之一,其中不乏体现主体与其生存环境同构互动的精神生态隐喻。本文对此种隐喻进行界定并提出识别程序,选取《庄子》精神生态隐喻英译实例,探究何种叙事重构方法能将《庄子》原文有关精神生态的隐喻叙事内容... 详细信息

隐喻言说是《庄子》话语特色之一,其中不乏体现主体与其生存环境同构互动的精神生态隐喻。本文对此种隐喻进行界定并提出识别程序,选取《庄子》精神生态隐喻英译实例,探究何种叙事重构方法能将《庄子》原文有关精神生态的隐喻叙事内容更好地被译入语读者群接受并认可,进而将原文的精神生态内涵在异域文化中得以传递。《庄子》精神生态隐喻主要有喻体源于自然意象和非自然意象等两类。前者的英译可遵照选择性采用的诗化叙事重构方法,后者的英译宜采取人物事件再定位的语境重构策略。聚焦《庄子》中精神生态隐喻的译介叙事重构研究,可对以生态思想外译为导向的《庄子》英译实践与研究提供参考。

关键词：精神生态隐喻隐喻识别叙事重构选择性采用人物事件再定位

和田绿洲、水系、流域山区部分及高程分类数据集的内容与研发

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全球变化数据学报（中英文） 2023年第3期7卷 314-320,426-432页

作者：林敬梧桂东伟张思源刘闯中国科学院新疆生态与地理研究所乌鲁木齐830011 中国科学院大学北京100049 新疆策勒荒漠草地生态系统国家野外科学观测研究站策勒848300 中国科学院地理科学与资源研究所北京100101

绿洲作为干旱区的非地带性地理单元,承载着干旱地区居民的生产和生活,对于该地区的社会经济发展具有无可替代的重要意义。本研究以Google Earth Pro上的遥感影像为主要数据来源,通过目视解译制作了2015年和田河绿洲和水系数据,同时运用... 详细信息

绿洲作为干旱区的非地带性地理单元,承载着干旱地区居民的生产和生活,对于该地区的社会经济发展具有无可替代的重要意义。本研究以Google Earth Pro上的遥感影像为主要数据来源,通过目视解译制作了2015年和田河绿洲和水系数据,同时运用数字高程模型(DEM)和ArcGIS水文分析工具,获取了和田河流域山区部分的范围和高程分类数据。研究结果显示,和田绿洲的总面积为4,820.94 km^(2),流域山区部分的面积为40,812.80 km^(2)。利用六边形格网法对数据进行精度检验,得到准确率为96.58%。数据集包括以下内容:(1)和田绿洲的边界数据;(2)滋养和田绿洲的水系数据;(3)流域山区部分的边界数据;(4)流域山区部分的高程分类数据。这些数据集共包含49个数据文件,以.kmz、.shp和.tif数据格式存储,总数据量为91.40 MB(已压缩成5个文件,总计45.80 MB)。

关键词：绿洲和田水系流域高程

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