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Transfer learning-based encoder-decoder model with visual explanations for infrastructure crack segmentation:New open database and comprehensive evaluation

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Underground Space 2024年第4期17卷 60-81页

作者： Fangyu Liu wenqi Ding Yafei Qiao Linbing Wang Illinois Center for Transporation Department of Civil and Environmental EngineeringUniversity of Illinois Urbana-ChampaignIllinois 61801USA Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji UniversityShanghai 200092China School of Environmental CivilAgricultural and Mechanical EngineeringUniversity of GeorgiaGeorgia 30602USA

Contemporary demands necessitate the swift and accurate detection of cracks in critical infrastructures,including tunnels and *** study proposed a transfer learning-based encoder-decoder method with visual explanations for infrastructure crack ***,a vast dataset containing 7089 images was developed,comprising diverse conditions—simple and complex crack patterns as well as clean and rough ***,leveraging transfer learning,an encoder-decoder model with visual explanations was formulated,utilizing varied pre-trained convolutional neural network(CNN)as the *** explanations were achieved through gradient-weighted class activation mapping(Grad-CAM)to interpret the CNN segmentation ***,accuracy,complexity(computation and model),and memory usage assessed CNN feasibility in practical *** performance was gauged via prediction and visual *** investigation encompassed hyperparameters,data augmentation,deep learning from scratch *** learning,segmentation model architectures,segmentation model encoders,and encoder pre-training *** underscored transfer learning’s potency in enhancing CNN accuracy for crack segmentation,surpassing deep learning from ***,encoder classification accuracy bore no significant correlation with CNN segmentation *** all tested models,UNet-EfficientNet_B7 excelled in crack segmentation,harmonizing accuracy,complexity,memory usage,prediction,and visual explanation.

关键词： Crack segmentation Transfer learning Visual explanation Infrastructure Database

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Flow behavior of non-spherical particle flowing in hopper

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Frontiers in Energy 2014年第3期8卷 315-321页

作者： He TAO wenqi ZHONG Baosheng JIN School of Civil Construction Zhengzhou Institute of Aeronautical Industry Management Zhengzhou 450000 China School of Energy & Environment Southeast University Nanjing 210096 China

Ellipsoidal particles flowing in the hopper were simulated by using the discrete element method （DEM）, and described by the multi-element method. The contact detection algorithm and equations for ellipsoidal particle motion in hopper were developed. And the simulation results were confirmed by experiment. Additionally, the mass flow rate, pressure distribution and velocity distribu- tion of two kinds of particles were examined. The results show that the mass flow rate of ellipsoidal particles is smaller than that of spherical particles. There is a maximum value of pressure drop at the top of the junction. Besides, the pressure drop decreases with the discharging time increasing. The velocity of spherical particle is larger than that of ellipsoidal.

关键词： discrete element method ellipsoidal particle,flow behavior hopper

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CONVERGENCE OF LAPLACIAN SPECTR A FROM R ANDOM SA MPLES

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Journal of Computational Mathematics 2020年第6期38卷 952-984页

作者： wenqi Tao Zuoqiang Shi Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China

Eigenvectors and eigenvalues of discrete Laplacians are often used for manifold learning and nonlinear dimensionality *** Laplacian is one widely used discrete laplacian on point *** was previously proved by Belkin and Niyogithat the eigenvectors and eigenvalues of the graph Laplacian converge to the eigenfunctions and eigenvalues of the Laplace-Beltrami operator of the manifold in the limit of infinitely many data points sampled independently from the uniform distribution over the ***,we introduced Point Integral method(PIM)to solve elliptic equations and corresponding eigenvalue problem on point *** this paper,we prove that the eigenvectors and eigenvalues obtained by PIM converge in the limit of infinitely many random ***,estimation of the convergence rate is also given.

关键词： Graph Laplacian Laplacian spectra Random samples Spectral convergence

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Unraveling the degradation mechanism of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) at the high cut-off voltage for lithium ion batteries

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Journal of Energy Chemistry 2023年第2期77卷 428-437,I0011页

作者： Liming Wang Qingmei Su Bin Han Weihao Shi Gaohui du Yunting Wang Huayv Li Lin Gu wenqi Zhao Shukai Ding Miao Zhang Yongzhen Yang Bingshe Xu School of Materials Science&Engineering Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina School of Materials Science&Engineering Tsinghua UniversityBeijing 100084China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)layered oxides have been regarded as promising alternative cathodes for the next generation of high-energy lithium ion batteries(LIBs)due to high discharge capacities and energy densities at high operation ***,the capacity fading under high operation voltage still restricts the practical ***,the capacity degradation mechanism of NCM811 at atomic-scale is studied in detail under various cut-off voltages using aberration-corrected scanning transmission electron microscopy(STEM).It is observed that the crystal structure of NCM811 evolution from a layered structure to a rock-salt phase is directly accompanied by serious intergranular cracks under 4.9 V,which is distinguished from the generally accepted structure evolution of layered,disordered layered,defect rock salt and rock salt phases,also observed under 4.3 and 4.7 *** electron energy loss spectroscopy analysis also confirms the reduction of Ni and Co from the surface to the bulk,not the previously reported only Li/Ni interlayer *** degradation mechanism of NCM811 at a high cut-off voltage of4.9 V is attributed to the formation of intergranular cracks induced by defects,the direct formation of the rock salt phase,and the accompanied reduction of Ni^(2+)and Co^(2+)phases from the surface to the bulk.

关键词： Ni-rich layered cathode Electrochemical performance Degradation mechanism Crack Atomic scale

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基于参数迁移的摇臂传动系统跨工况故障诊断算法

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煤矿机械 2025年第1期46卷 186-189页

作者：邵文琦赵梦奇国家能源集团乌海能源有限责任公司公乌素煤矿内蒙古乌海016000 辽宁工程技术大学电气与控制工程学院辽宁葫芦岛125105

摇臂传动系统在采煤机中扮演着至关重要的角色,直接影响着煤炭生产的效率。针对跨工况迁移故障诊断难题,研究发现源域和目标域的故障数据特征分布相似。为此,提出了一种基于参数迁移的故障诊断模型。该模型采用全局均值池化的迁移卷积... 详细信息

摇臂传动系统在采煤机中扮演着至关重要的角色,直接影响着煤炭生产的效率。针对跨工况迁移故障诊断难题,研究发现源域和目标域的故障数据特征分布相似。为此,提出了一种基于参数迁移的故障诊断模型。该模型采用全局均值池化的迁移卷积神经网络(TCNNG)模型,能够自动从源域工况数据中提取特征信息。通过参数迁移加微调的策略,将诊断知识参数从源域成功迁移到目标域,显著提高了模型在不同工况下的故障识别率和泛化性能。

关键词：采煤机摇臂传动系统故障诊断深度学习迁移学习

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Advances in aggregatable nanoparticles for tumor-targeted drug delivery

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Chinese Chemical Letters 2020年第6期31卷 1366-1374,F0002页

作者： wenqi Yu Maxim Shevtsov Xianchun Chen Huile Gao Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610064China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China Institute of Cytology of the Russian Academy of Sciences(RAS) St.Petersburg 194064.Russia

Recent days,aggregatable nanoparticles,which can specifically respond to certain stimulus,have shown great potential in tumor-targeted drug delivery with prolonged retention and deeper *** this review,we summarize recent advances in design of aggregatable nanoparticles by different ***(pH and enzyme)and external(light,temperature and ROS)stimuli are introduced for a comprehensive ***,the aggregated nanoparticles usually exhibit photothermal,photoacoustic,PET and enhanced MRI contrast,which is also *** the end,we discuss about the potential applications and challenges for the future clinical translation.

关键词： Stimuli-responsive nanoparticles Size aggregation Tumor-targeted drug delivery Transformation Microenvironment modulation

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Significance of long non-coding RNA AGPG for the metabolism of esophageal cancer

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Cancer Communications 2020年第7期40卷 313-315页

作者： Rebecca Elizabeth Vargas wenqi Wang Department of Developmental and Cell Biology University of CaliforniaIrvineCalifornia92697USA

Over the years,thousands of long non-coding RNAs(lncRNAs)have been identified to be exclusively expressed in specific cancer types and for their unique functions in *** has led to an increasing interest in elucidating the vital roles[1]and underlying mechanism[2,3]of such non-coding genome in driving cancerous phenotypes.A number of studies have pinpointed the key functions of lncRNAs in diverse biological events including chromatin interactions,transcriptional regulation,RNA processing,mRNA stabilization,signal transduction,and metabolic regulation;highlighting their essential roles in both physiology and diseases such as cancer[4].

关键词： metabolism esophageal cancer

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Finite Element Analysis of the Steel Reinforced Plastic Pipe

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Journal of Materials Science & Technology 2003年第Z1期19卷 43-45页

作者： Hongyi SUN wenqi MA Dachang KANG Keding ZHAO Harbin University of Science and Technology Harbin 150080 China Daqing Oilfields Postdoctoral Workstation Daqing 163453 China Harbin Institute of Technology Harbin 150001 China Daqing Oilfields Postdoctoral Workstation Daqing 163453 China Harbin Institute of Technology Harbin 150001 China Harbin Institute of Technology Harbin 150001 China

The steel reinforced plastic pipe is a kind of green environmental protection pipelines with double-sides corrosionresisting and better withstanding to medium working pressure. The structure and technical process of this pipe are described briefly in this paper, and the finite element analysis has been done for the sake of understanding the distributions of stress and displacement inside this pipe under hydrostatic pressure. The analysis results are very important for safety application of the steel reinforced plastic pipe.

关键词： Steel reinforced plastic pipe, Finite element analysis

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Physical exercise protects muscle from accelerated aging induced by high-salt intake and muscle CG2196(salt)gene overexpression in Drosophila

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Food Science and Human Wellness 2023年第6期12卷 1948-1960页

作者： Dengtai Wen Yiling Chen Xu Tian wenqi Hou Department of Physical Education Ludong UniversityYantai 264025China College of Physical Education Yichun UniversityYichun 336000China School of Exercise and Health Shanghai University of SportShanghai 200438China

Aging decreases muscle mass,strength,and functional ***-salt stress seems to promote muscle aging and decrease ***,exercise delays muscle aging and increases longevity,and it may protect muscle from rapid aging induced by high-salt intake(HSI),but the molecular mechanisms are poorly *** this study,the flies were fed a high-salt diet and trained to *** CG2196(salt)gene and dSir2 gene were over-expressed by building mef2-gal4/UAS *** results showed that both physical exercise and muscle dSir2 gene overexpression prevented HSI-induced and muscle salt overexpression-induced accelerated age-related decline of climbing index,climbing endurance,muscle NAD^(+)level,SOD activity level,dSir2 expression,and dFOXO expression,and they also prevented HSI-induced and muscle salt overexpression-induced accelerated age-related increase in muscle ROS level,MDA level,and salt gene *** exercise improved lifespan decrease induced by HSI and muscle salt ***,current results indicated that high-salt stress accelerated muscle aging by decreasing muscular NAD^(+)/dSir2/dFOXO pathway activity and increasing oxidative *** exercise protected muscle from accelerated aging induced by high-salt stress through activating muscle NAD^(+)/dSir2/dFOXO pathway and enhancing muscle oxidation *** combination of exercise and muscle dSir2 overexpression had the best protective effect on muscle aging and lifespan in flies.

关键词： Physical exercise high-salt intake muscle aging NAD^(+)/dSir2

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电晕休眠对卵形鲳鲹的生理应激和保活运输中主要营养成分的影响

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渔业科学进展 2025年第1期46卷 210-221页

作者：刘思炜钟家美范秀萍秦小明沈建徐文其广东海洋大学食品科技学院广东省水产品加工与安全重点实验室广东省海洋食品工程技术研究中心水产品深加工广东普通高等学校重点实验室广东湛江524088 海洋食品精深加工关键技术省部共建协同创新中心大连工业大学辽宁大连116034 中国水产科学研究院渔业机械仪器研究所上海200092

探究电晕休眠对卵形鲳鲹(Trachinotus ovatus)的生理应激指标的影响以及在保活运输过程中主要营养成分的变化,研发绿色、安全、高效的水产品保活运输诱导休眠新技术。采用脉冲直流电对卵形鲳鲹进行电击,以休眠率、休眠时间和72 h存活率... 详细信息

探究电晕休眠对卵形鲳鲹(Trachinotus ovatus)的生理应激指标的影响以及在保活运输过程中主要营养成分的变化,研发绿色、安全、高效的水产品保活运输诱导休眠新技术。采用脉冲直流电对卵形鲳鲹进行电击,以休眠率、休眠时间和72 h存活率作为评价指标,优化脉冲直流电晕休眠的最佳处理条件,并测定其血清、脑组织、肌肉和肝脏生化、氧化应激及代谢指标。结果显示,在20℃水温,140V电压、4 s处理时间的条件下,鱼体休眠率与保活72 h存活率达可达100%,保活时间为(165.6±42.7)h。经电晕休眠处理后,鱼血清中谷草转氨酶(GOT)活性、葡萄糖(GLU)和皮质醇(COR)含量显著升高,在保活4~12h内恢复正常水平;肝脏、脑组织中的热休克蛋白70(Hsp70)含量与谷胱甘肽巯基转移酶(GST-S)活性,肝脏中过氧化氢酶(CAT)活性以及肝脏、肌肉乳酸(LD)含量显著提高,脑组织丙二醛(MDA)含量在保活4~72h内显著低于对照组水平,肝糖原(GLY)含量整体呈下降趋势;鱼肉中粗灰分、粗蛋白和粗脂肪在保活过程中整体呈下降趋势,其中,粗脂肪含量下降幅度最大,且与对照组相比,实验组下降占比减少。研究表明,适宜条件的脉冲直流电能诱导卵形鲳鲹休眠,提高Hsp70的释放和抗氧化酶的活性以减缓保活胁迫下鱼体应激响应,减少组织的损伤,且保活后鱼体能维持较低的代谢水平,可提升保活运输过程中的效率与品质。

关键词：卵形鲳鲹电晕休眠基本营养成分氧化应激

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