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Additive manufacturing of copper-stainless steel hybrid components using laser-aided directed energy deposition

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Journal of Materials Science & Technology 2021年第21期80卷 100-116页

作者： Xinchang Zhang Tan Pan yitao chen Lan Li Yimlu Zhang Frank Liou Department of Mechanical&Aerospace Engineering Missouri University of Science and TechnologyRollaMO65409USA

Combining dissimilar materials in a single component is an effective solution to integrate diverse material properties into a single ***-stainless steel hybrid components are attracting more and more attention since the high thermal conductivity of copper can greatly enhance the thermal performance of stainless steel,which benefits its applications in many ***,direct joining of copper and stainless steel such as SS316 L is challenging since they preserve significant dissimilarities in physical,chemical,and thermo-mechanical *** paper aims to fabricate well-bonded copper-SS316 L hybrid parts using a laser-aided directed energy deposition(DED) process.A nickel-based alloy Deloro22(D22) is introduced between copper and SS316 L to address the detrimental issues in copper-SS316 L direct *** this technique,defect-free interfaces are achieved at both the D22-SS316 L and copper-D22 transition *** testing of Cu-D22-SS316 L and D22-SS316 L hybrid parts shows the fracture occurs at pure copper and SS316 L region,respectively,indicating an excellent bonding at the *** in the building direction,a transition of grain structure is observed.A significant diffusion zone is obtained at both the D22-SS316 L and the Cu-D22 *** large diffusion distance results in a smooth variation in microhardness over the dissimilar *** microhardness increases from SS316 L to D22 with the highest value of 240 HV and then decreases from D22 to Cu with the lowest value of 63 ± 4 *** of thermophysical properties of the Cu-D22-SS316 L system indicates there is a ~300 % increase in thermal diffusivity and a ~200 % increase in thermal conductivity when compared to pure SS316 *** significant increase in thermal diffusivity and conductivity validates the enhanced thermal performance of SS316 L when it is joined with pure copper.

关键词： Additive manufacturing Directed energy deposition Multi-material components Dissimilar materials Copper Stainless steel

Pill Defect Detection Based on Improved YOLOv5s Network

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Instrumentation 2022年第3期9卷 27-36页

作者： AI Sheng chen yitao LIU Fang ZHU Aoxiang School of Mechanical Engineering and Automation Wuhan Textile UniversityWuhan 430200 Yunmeng County Hospital of Chinese Medicine Xiaogan 432000

To address the problems of low detection accuracy and slow speed of traditional vision in the pharmaceutical industry,a YOLOv5s-EBD defect detection algorithm:Based on YOLOv5 network,firstly,the channel attention mechanism is introduced into the network to focus the network on defects similar to the pill background,reducing the time-consuming scanning of invalid backgrounds;the PANet module in the network is then replaced with BiFPN for differential fusion of different features;finally,Depth-wise separable convolution is used instead of standard convolution to achieve the output Finally,Depth-wise separable convolution is used instead of standard convolution to achieve the output feature map requirements of standard convolution with less number of parameters and computation,and improve detection *** improved model is able to detect all types of defects in tablets with an accuracy of over 94%and a detection speed of 123.8 fps,which is 4.27%higher than the unimproved YOLOv5 network model with 5.2 fps.

关键词： Pill Defect Detection Channel Attention Mechanism Differentiation Fusion Depth-separable Convolution

Review and Prospect of Tibetan Stupa Research in China During the Last Hundred Years

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Journal of Landscape Research 2022年第6期14卷 68-72,76页

作者： chen yitao College of History and Culture Northwest Normal UniversityLanzhouGansu 730000China

Tibetan stupas are the symbolic buildings of Tibetan Buddhism, widely distributed on the Qinghai-Tibet Plateau, with a long history and rich cultural connotations, holding a lofty position in the hearts of Tibetan monks and laymen. In the new era of advocating national cultural confidence, Tibetan stupa, as the representative of Tibetan culture, should be explored for its historical significance and artistic value. In recent years, many scholars have conducted in-depth studies on Tibetan stupas from different disciplinary perspectives. In order to further promote the research on Tibetan stupas, this paper reviews the research on Tibetan stupas in China in the past century, and comments on the problems and deficiencies of the research on Tibetan stupas in China in the past century on the basis of the analysis of the previous research status, so as to provide a valuable reference for the further research on Tibetan stupas.

关键词： Tibetan Buddhism Pagoda Qinghai-Tibet Plateau Architectural culture

Marital Status as a Moderator:Exploring the Relationship between Social Engagement and Depressive Symptoms in China’s Older Adult Population

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Biomedical and Environmental Sciences 2024年第10期37卷 1142-1157页

作者： Jianlun Wu Yaping Ye Man Zhang Ruichen Cong yitao chen Pengfei Yu Qing Guo School of Public Health Zhejiang Chinese Medical UniversityHangzhou 310000ZhejiangChina School of humanities and management Zhejiang Chinese Medical UniversityHangzhou 310000ZhejiangChina Graduate School of Human Sciences Waseda UniversityTokorozawa 3591192Japan Wake Forest Institute for Regenerative Medicine Wake Forest University Health SciencesWinston-SalemNC27101USA

Objective This study aims to explore the complex relationship between social engagement and depressive symptoms among older adults in China,focusing particularly on the moderating role of marital *** This study used data from the latest Chinese Longitudinal Healthy Longevity Survey(CLHLS).The analysis used the latent class analysis to delineate personality clusters and hierarchical linear regression,supplemented by the PROCESS macro,to investigate the effects of social engagement and marital status on depressive *** The analysis encompassed 7,789 respondents(mean age:82.53[s=11.20]years),with 54%*** personality analysis categorized participants into four clusters,with the majority(77.60%)classified as Confident Idealists,who exhibited the lowest levels of depressive *** linear regression analysis yielded several significant findings:Higher levels of social engagement were significantly associated with fewer depressive symptoms(t=-7.932,P<0.001,B=-0.463).Marital status was a significant factor;married individuals reported fewer depressive symptoms compared to their unmarried counterparts(t=-6.368,P<0.001,B=-0.750).There was a significant moderating effect of marital status on the relationship between social engagement and depressive symptoms(t=-2.092,P=0.037,B=-0.217).Conclusion This study demonstrates that,among Chinese older adults,both social engagement and marital status significantly influence depressive *** social engagement,particularly in other activities like doing household chores,gardening,reading newspapers or books,and playing cards or Mahjong,is associated with fewer depressive symptoms,especially among married individuals.

关键词： Social engagement Depressive symptoms Marital status Moderator Older adults

wbForming mechanism of collapse angle of fine blanking parts with sharp corners and influence of position of V-ring indenter of die on it

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石化技术 2019年第10期26卷 158-160页

作者： Xiaomei Yang chen yitao Jie Wang School of Mechanical Engineering and Automation Wuhan Textile University

Fine blanking parts with sharp corners produce collapse angles in the fine blanking process,and larger collapse angles can affect the parts’ performance and lifetime. In this paper,a fine blanking part with sharp corners was taken as an example to analyze the forming mechanism of the collapse angles by DEFORM 3 D,then studying the influence of the position of the V-ring indenter of die on the collapse angle. It was concluded that the material’s metal flow line was intensive near the blanking clearance;The equivalent stress area of the material was mainly concentrated around the blanking clearance,and then gradually shrinked to joint of part and scrap;the closer the distance L was,and the smaller equivalent stress area was mainly concentrated around the blanking clearance was,and the smaller collapse angle was.

关键词： collapse angle DEFORM 3D fine blanking

海外学者关于中国式农业农村现代化的认知与评价

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当代中国史研究 2024年第3期31卷 138-152,M0007页

作者：陈奕涛华东师范大学马克思主义学院 200241

农业农村现代化是中国式现代化的“压舱石”。进入新时代,在以习近平同志为核心的党中央带领下,中国式农业农村现代化取得了历史性成就,引起了国际社会的广泛关注与讨论。梳理相关文献发现,海外学者既充分肯定了中国式农业农村现代化的... 详细信息

农业农村现代化是中国式现代化的“压舱石”。进入新时代,在以习近平同志为核心的党中央带领下,中国式农业农村现代化取得了历史性成就,引起了国际社会的广泛关注与讨论。梳理相关文献发现,海外学者既充分肯定了中国式农业农村现代化的发展成就,也在此基础上分析和总结了中国式农业农村现代化发展的动力机制、鲜明特征与世界意义。海外学者的相关认知、解读与评价,不仅为我们理解中国式农业农村现代化提供了异域视野与“他者”镜像,也为我们推进中国式农业农村现代化建设与研究、对外讲好中国乡村振兴故事提供了有益启发。

关键词：海外学者中国式农业农村现代化化认知评价

Data Room Management System Based on Target Detection Algorithm

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Data Room Management System Based on Target Detection Algori...

第40届中国控制会议

作者： Zhicheng Zhao Weihua Cao Kang Li yitao chen School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education

In recent years,streaming media services have been widely used in data room management *** order to record the user operations,host machine alarms and reminder in real time,target detection algorithms for streaming media have played an important *** target detection methods,limited by detection speed,are not suitable for such real-time ***,in this paper,we applies SSD（Single Shot MultiBox Detector） algorithm to data room management ***,we constructs a host operating image data set,and then perform data amplification by adding noise and ***,the SSD model is used to train a ***,after obtaining the target detection results,the NMS（Non-Maximum Suppression）algorithm is used to avoid the redundant detection *** the same time,some improvement measures are put forward to solve the problem of small target,leading to the difficulty of feature extraction and low detection *** experimental results demonstrate that the model can detect and track the target better in the video and meet the requirements of the real-time performance and accuracy of the system.

关键词： target detection data room management system streaming media SSD

来源： cnki会议评论

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水轮发电机组三维动态仿真研究

电力系统自动化 2001年第8期25卷 49-52,70页

作者：陈燚涛李朝晖华中科技大学水利水电及自动化工程系武汉430074

为满足水轮发电机组控制、维护及技术管理综合集成自动化系统人机交互的需求 ,采用三维动画多媒体仿真技术将实际物理系统在计算机上重现出来 ,让操作、维护人员在虚拟现实空间中形象直观地监视机组状态 ,分析状态演绎过程 ,了解设备的... 详细信息

为满足水轮发电机组控制、维护及技术管理综合集成自动化系统人机交互的需求 ,采用三维动画多媒体仿真技术将实际物理系统在计算机上重现出来 ,让操作、维护人员在虚拟现实空间中形象直观地监视机组状态 ,分析状态演绎过程 ,了解设备的结构特征和操作维修技巧 ,对提高操作维护水平具有重要意义。文中对水轮发电机组三维动态仿真系统的结构、原理、软件实现方法进行了介绍 ,对系统的数据采集和数据库设计等进行了描述。

关键词：水轮发电机组虚拟现实三维动态仿真人机交互计算机仿真

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基于相关累加的正弦波频率估计算法

数据采集与处理 2008年第6期23卷 729-733页

作者：陈役涛刘渝邓振淼南京航空航天大学信息科学与技术学院南京210016

提出了一种新的正弦波频率估计算法。首先用FFT对信号频率进行粗略估计,再对原始信号进行相关累加后提取相位信息,估计出频偏,经过频偏校正得到频率的精确估计。在整个频段内该算法与Rife算法性能互补,因此本文又提出了两者相结合的综合... 详细信息

提出了一种新的正弦波频率估计算法。首先用FFT对信号频率进行粗略估计,再对原始信号进行相关累加后提取相位信息,估计出频偏,经过频偏校正得到频率的精确估计。在整个频段内该算法与Rife算法性能互补,因此本文又提出了两者相结合的综合Synthetic correcting rife(SCR)算法。该综合算法计算量略大于FFT,小于修正Rife算法。仿真结果表明,该算法估计性能接近修正Rife算法,将该算法的结果作为牛顿迭代的初始值,进行一次迭代后性能逼近CRLB。

关键词：频率估计频偏校正牛顿迭代克拉美-罗限