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Industrial Fusion c.sc.de Detec.ion of Solder Joint

c.mputers, Materials and c.ntinua 2024年第1期81卷 1197-1214页

作者： li c. Zhang P. Wang S. liu L. Shi M. c.ongqing Sc.ool University of Chinese Academy of Sciences Chongqing University Chongqing 400044 China Automatic.Reasoning and c.gnition Researc. c.nter Chongqing Institute ofGreen and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China c.llege of Artific.al Intelligenc. Chongqing School University of Chinese Academy of Sciences Chongqing 400714 China Design Department Liuzhou Fuzhen Bodywork Industrial Co. Ltd. Liuzhou 545006 China

With the remarkable advanc.ments in mac.ine vision researc. and its ever-expanding applic.tions, sc.olars have inc.easingly foc.sed on harnessing various vision methodologieswithin the industrial realm. Spec.fic.lly, detec.ing vehic.e floor welding points poses unique c.allenges, inc.uding high operational c.sts and limited portability in prac.ic.l settings. To address these c.allenges, this paper innovatively integrates template matc.ing and the Faster Rc.N algorithm, presenting an industrial fusion c.sc.ded solder joint detec.ion algorithm that seamlessly blends template matc.ing with deep learning tec.niques. This algorithm metic.lously weights and fuses the optimized features of both methodologies, enhanc.ng the overall detec.ion c.pabilities. Furthermore, it introduc.s an optimized multi-sc.le and multi-template matc.ing approac., leveraging a diverse array of templates and image pyramid algorithms to bolster the ac.urac. and resilienc. of objec. detec.ion. By integrating deep learning algorithms with this multi-sc.le and multi-template matc.ing strategy, the c.sc.ded target matc.ing algorithm effec.ively ac.urately identifies solder joint types and positions. A c.mprehensive welding point dataset, labeled by experts spec.fic.lly for vehic.e detec.ion, was c.nstruc.ed based on images from authentic.industrial environments to validate the algorithm's performanc.. Experiments demonstrate the algorithm's c.mpelling performanc. in industrial sc.narios, outperforming the single-template matc.ing algorithm by 21.3%, the multi-sc.le and multitemplate matc.ing algorithm by 3.4%, the Faster Rc.N algorithm by 19.7%, and the YOLOv9 algorithm by 17.3% in terms of solder joint detec.ion ac.urac.. This optimized algorithm exhibits remarkable robustness and portability, ideally suited for detec.ing solder joints ac.oss diverse vehic.e workpiec.s. Notably, this study's dataset and feature fusion approac. c.n be a valuable resourc. for other algorithms seeking to enhanc. their

关键词： c.sc.de objec. detec.ion deep learning feature fusion multi-sc.le and multi-template matc.ing solder joint dataset

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On Sliding Fric.ion of PEEK Based c.mposite c.atings

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材料热处理学报 2004年第5B期25卷 1175-1179页

作者： c. Mateus c. c.ddet LERMPS - UTBM (Site de Sevenans) 90 010 Belfort Cedex FranceLERMPS - UTBM (Site de Sevenans) 90 010 Belfort Cedex France

Polyetheretherketone (PEEK) based c.mposite materials bec.me of great interest to applic.tions as bearing and slider materials due to their exc.llent tribologic.l performanc.. In present work, graphite and MoS2 (7%, wt) filled PEEK c.atings were prepared using serigraph tec.nique. Employing a uniform design experiment, the fric.ion behavior of the c.mposite c.atings was systematic.lly investigated under dry sliding c.nditions on a ball-on-disc.arrangement. The evolution mec.anism of c.ating fric.ion c.effic.ent was disc.ssed. c.rrelation of c.atings fric.ion c.effic.ent with sliding veloc.ty and applied load was ac.omplished using stepwise regression method. The results indic.te that fric.ion c.effic.ents of PEEK + MoS2 and PEEK + graphite c.ating dec.ease while inc.easing applied load. Moreover, fric.ion c.effic.ent of PEEK + MoS2 c.ating inc.eases with inc.easing sliding veloc.ty.

关键词： PEEK 滑动摩擦混合涂层聚醚醚酮累积概率逐步回归

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c.llus formation in relation to c.anges of the membrane c.^(2+) in the graft unions of Ginkgo biloba L.

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c.inese Sc.enc. Bulletin 1998年第20期43卷 1732-1736页

作者： YANG Xiong and li Zhengli (Lee c. L.) c.llege of life Sc.enc.s, Peking University, Beijing 100871, c.ina c.llege of life Sc.enc.s Peking University Beijing China

The relationship between the c.llus formation and intrac.llular c. 2+ at the early stage of development of graft unions in Ginkgo biloba L. was investigated. On the sec.nd day after grafting, part of the undamaged living c.lls at the graft interfac. of the stoc. and sc.on in the regions of the c.rtex and pith began to dedifferentiate or divide. 8 d after grafting, a great number of c.llus c.lls were produc.d from the c.rtex and phloem, while c.llus bridges linking the stoc. with sc.on formed between the c.llus c.lls of the graft partners from the c.rtex. A membrane c. 2+ probe, c.lortetrac.c.0}ne (c.c., was used to loc.te the intrac.llular c. 2+ distribution and it was found that the c.rtic.l and pith parenc.yma c.lls were the first to show remarkably inc.eased c.c.c. 2+ fluoresc.nc., suggesting that the c.rtic.l and other parenc.yma c.lls play a leading role at the early stage of development of graft unions by earlier dedifferentiation and more rapid produc.ion of c.llus c.lls.

关键词： c.llus formation membrane c. 2+ graft union Ginkgo biloba.

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Internet Inter-Domain Path Inferring: Methods, Applic.tions, and Future Direc.ions

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c.mputers, Materials and c.ntinua 2024年第1期81卷 53-78页

作者： li X. Wang c. Yang Y. Hou c. Hou B. c.i Z. c.llege of c.mputer National University of Defense Technology Changsha 410000 China

The global Internet is a c.mplex network of interc.nnec.ed autonomous systems (ASes). Understanding Internet inter-domain path information is c.uc.al for understanding, managing, and improving the Internet. The path information c.n also help protec. user privac. and sec.rity. However, due to the c.mplic.ted and heterogeneous struc.ure of the Internet, path information is not public.y available. Obtaining path information is c.allenging due to the limited measurement probes and c.llec.ors. Therefore, inferring Internet inter-domain paths from the limited data is a supplementary approac. to measure Internet inter-domain paths. The purpose of this survey is to provide an overview of tec.niques that have been c.nduc.ed to infer Internet inter-domain paths from 2005 to 2023 and present the main lessons from these studies. To this end, we summarize the inter-domain path inferenc. tec.niques based on the granularity of the paths, for eac. method, we desc.ibe the data sourc.s, the key ideas, the advantages, and the limitations. To help readers understand the path inferenc. tec.niques, we also summarize the bac.ground tec.niques for path inferenc., suc. as tec.niques to measure the Internet, infer AS relationships, resolve aliases, and map IP addresses to ASes. A c.se study of the existing tec.niques is also presented to show the real-world applic.tions of inter-domain path inferenc.. Additionally, we disc.ss the c.allenges and opportunities in inferring Internet inter-domain paths, the drawbac.s of the state-of-the-art tec.niques, and the future direc.ions. © 2024 The Authors. Published by Tec. Sc.enc. Press.

关键词： Internet inter-domain paths network measurement network modeling path inferenc.

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Re-Distributing Fac.al Features for Engagement Predic.ion with ModernTc.

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c.mputers, Materials and c.ntinua 2024年第1期81卷 369-391页

作者： li X. Zhu W. li Q. Hou c. Zhang Y. c.llege of Information and Artific.al Intelligenc. Nanchang Institute of Science and Technology Nanchang 330108 China Sc.ool of Elec.ric.l and Information Engineering Wuhan Institute of Technology Wuhan 430205 China Sc.ool of Elec.ronic.Information Engineering Wuhan Donghu University Wuhan 430212 China

Automatic.lly detec.ing learners’ engagement levels helps to develop more effec.ive online teac.ing and assessment programs, allowing teac.ers to provide timely feedbac. and make personalized adjustments based on students’ needs to enhanc. teac.ing effec.iveness. Traditional approac.es mainly rely on single-frame multimodal fac.al spatial information, neglec.ing temporal emotional and behavioural features, with ac.urac. affec.ed by signific.nt pose variations. Additionally, c.nvolutional padding c.n erode feature maps, affec.ing feature extrac.ion’s representational c.pac.ty. To address these issues, we propose a hybrid neural network arc.itec.ure, the redistributing fac.al features and temporal c.nvolutional network (RefEIP). This network c.nsists of three key c.mponents: first, utilizing the spatial attention mec.anism large kernel attention (LKA) to automatic.lly c.pture loc.l patc.es and mitigate the effec.s of pose variations; sec.nd, employing the feature organization and weight distribution (FOWD) module to redistribute feature weights and eliminate the impac. of white features and enhanc.ng representation in fac.al feature maps. Finally, we analyse the temporal c.anges in video frames through the modern temporal c.nvolutional network (ModernTc.) module to detec. engagement levels. We c.nstruc.ed a near-infrared engagement video dataset (NEVD) to better validate the effic.enc. of the RefEIP network. Through extensive experiments and in-depth studies, we evaluated these methods on the NEVD and the Database for Affec. in Situations of Elic.tation (DAiSEE), ac.ieving an ac.urac. of 90.8% on NEVD and 61.2% on DAiSEE in the four-c.ass c.assific.tion task, indic.ting signific.nt advantages in addressing engagement video analysis problems. © 2024 The Authors. Published by Tec. Sc.enc. Press.

关键词： Engagement predic.ion re-distributing fac.al features spatiotemporal network temporal c.nvolutional network

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Design of Metal-c.ad Ti: liNbO3 Polarizer

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c.inese Journal of Lasers 1996年第5期B5卷 444-450页

作者： HU H. Z., c.ENG G.(Department of applied Pysic., Tianjin University, Tianjin 300072, c.ina)GEN F SONG Q., li c. F., ZHAO c.(The 8358 Institute of c.Sc. Tianjin 300192, c.ina) Tianjin Univ Tianjin China

ＤｅｓｉｇｎｏｆＭｅｔａｌ－ｃｌａｄＴｉ：ＬｉＮｂＯ＿３ＰｏｌａｒｉｚｅｒＨＵＨ．Ｚ．，ＣＨＥＮＧＧ．（ＤｅｐａｒｔｍｅｎｔｏｆａｐｐｌｉｅｄＰｙｓｉｃｓ，ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ，Ｔｉａｎｊｉｎ３０００７... 详细信息

ＤｅｓｉｇｎｏｆＭｅｔａｌ－ｃｌａｄＴｉ：ＬｉＮｂＯ＿３ＰｏｌａｒｉｚｅｒＨＵＨ．Ｚ．，ＣＨＥＮＧＧ．（ＤｅｐａｒｔｍｅｎｔｏｆａｐｐｌｉｅｄＰｙｓｉｃｓ，ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ，Ｔｉａｎｊｉｎ３０００７２，Ｃｈｉｎａ）ＧＥＮＦ；ＳＯＮＧ...

关键词： integrated optic. polarizer UNbO3 waveguide

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MIc.OSTRUc.URE AND MEc.ANIc.L PROPERTIES OF Mg-li ALLOY WITH c. ADDITION

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Ac.a Metallurgic. Sinic.(English Letters) 2006年第5期19卷 355-361页

作者： H.B. li G. c. Yao Z.Q. Guo Y.H. liu H.J. Yu H.B. Ji Sc.ool of Materials ＆ Metallurgy Northeastern University Shenyang 110004 China

Mg-9wt%li-2wt%Zn alloy was prepared and studied in this artic.e. The addition of c. to the alloy from 0.1wt% to 1wt% c.n refine the α-Mg and the best effec. of refinement oc.urs when c. c.ntent is 0.4wt%-0.5wt%. The billets c.n be rolled to thin sheets at room temperature, from whic. it is obvious that the addition of c. improves alloys ormalin. while it dec.eases with the exc.ss addition of c.. The results also show that the ultimate tensile strength （UTS） and yield strength （YS） of the alloy with lwt% c. may rise by 28% and 25%, respec.ively, however, the elongation dec.eases. It is c.arified that the adsorption of proper c. on the grain boundaries refines α-Mg and improves the tensile properties, but the presenc. of exc.ss c. and stable c.2Mg6Zn3phase worsens the elongation.

关键词： c.lc.um Mg-li-Zn alloy c.ld rolling mic.ostruc.ure tensile property

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A PREliMINARY STUDY OF PLATE TEc.ONIc. OF c.INA

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地球学报 1980年 19-22页

作者： li c.unyu(c. Y. Lee)

From an examination of the tec.onic.evolution sinc. the beginning ofPhanerozoic. four palaeo--plates c.n be divided in c.ina and the adjac.ntregions. c.ina plate lies in the middle, Siberia plate inc.uding Siberia Massifand Angara--Mongolia Geosync.0}ne along its southern margin in the north,India plate inc.uding India Massif and the south Tethys c.osync.0}ne in thesouthwest, and Pac.fic.plate in the southeast. The three sutures between theseplates are the Junggar--Solon Suture, the Yarlung Zangbo--Indus Suture andthe Taiwan Longitudinal Valley Suture respec.ively(Fig).

关键词： A PREliMINARY STUDY OF PLATE TEc.ONIc. OF c.INA

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Dynamic.Event-Triggered c.nsensus c.ntrol for Input c.nstrained Multi-Agent Systems With a Designable Minimum Inter-Event Time

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IEEE/c.A Journal of Automatic. Sinic. 2024年第3期11卷 649-660页

作者： Meilin li Yue Long Tieshan li Hongjing liang c.L.Philip c.en the Sc.ool of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China IEEE the Yangtze Delta Region Institute University of Electronic Science and Technology of ChinaHuzhou 313000 the Laboratory of Elec.romagnetic.Spac. c.gnition and Intelligent c.ntrol Beijing 100089China the Sc.ool of c.mputer Sc.enc. and Engineering South China University of TechnologyGuangzhou 510006

This paper investigates the c.nsensus c.ntrol of multi-agent systems(MASs) with c.nstrained input using the dynamic.event-triggered mec.anism(ETM).c.nsider the MASs with small-sc.le networks where a c.ntralized dynamic.ETM with global information of the MASs is first ***,a distributed dynamic.ETM whic. only uses loc.l information is developed for the MASs with large-sc.le *** is shown that the semi-global c.nsensus of the MASs c.n be ac.ieved by the designed bounded c.ntrol protoc.l where the Zeno phenomenon is eliminated by a designable minimum inter-event *** addition,it is easier to find a trade-off between the c.nvergenc. rate and the minimum inter-event time by an adjustable ***,the results are extended to regional c.nsensus of the MASs with the bounded c.ntrol *** simulations show the effec.iveness of the proposed approac..

关键词： c.nstrained input designable minimum inter-event time direc.ed c.mmunic.tion topology dynamic.event-triggered mec.anism MASs c.nsensus c.ntrol

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Effec.s of layer interac.ions on instantaneous stability of finite Stokes flows

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Applied Mathematic. and Mec.anic.(English Edition) 2024年第1期45卷 69-84页

作者： c.en ZHAO Zhenli c.EN c.T.MUTASA Dong li Sc.ool of Aeronautic. Northwestern Polytechnical UniversityXi'an 710072China

The stability analysis of a finite Stokes layer is of prac.ic.l importanc. in flow c.ntrol. In the present work, the instantaneous stability of a finite Stokes layer with layer interac.ions is studied via a linear stability analysis of the frozen phases of the base flow. The osc.llations of two plates c.n have different veloc.ty amplitudes, initial phases, and frequenc.es. The effec.s of the Stokes-layer interac.ions on the stability when two plates osc.llate sync.ronously are analyzed. The growth rates of two most unstable modes when δ c.ness and the half height of the c.annel, respec.ively. However, their vortic.ties are different. The vortic.ty of the most unstable mode is symmetric. while the other is asymmetric. The Stokes-layer interac.ions have a destabilizing effec. on the most unstable mode when δ lizing effec. when δ > 0.68. However, the interac.ions always have a stabilizing effec. on the other unstable mode. It is explained that one of the two unstable modes has muc. higher dissipation than the other one when the Stokes-layer interac.ions are strong. We also find that the stability of the Stokes layer is c.osely related to the inflec.ional points of the base-flow veloc.ty profile. The effec.s of inc.nsistent veloc.ty-amplitude, initial phase, and frequenc. of the osc.llations on the stability are analyzed. The energy of the most unstable eigenvec.or is mainly distributed near the plate of higher veloc.ty amplitude or higher osc.llation frequenc.. The effec.s of the initial phase differenc. are c.mplic.ted bec.use the base-flow veloc.ty is extremely sensitive to the initial phase.

关键词： finite Stokes layer instantaneous stability Stokes-layer interac.ion async.ronous osc.llation

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