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Amplitude analysis of th. decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

Ch.nese Ph.sics C 2024年第8期48卷 6-33页

作者： M.Ablikim M.N.Ach.sov P.Adlarson O.Afedulidis X.C.Ai r.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban h.-r.bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianch. E.Bianco A.Bortone I.Boyko r.A.Briere A.Brueggemann h.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Ch.ng W.L.Ch.ng G.r.Ch. G.Ch.lkov C.Ch.n C.h.Ch.n Ch.o Ch.n G.Ch.n h.S.Ch.n M.L.Ch.n S.J.Ch.n S.L.Ch.n S.M.Ch.n T.Ch.n X.r.Ch.n X.T.Ch.n Y.B.Ch.n Y.Q.Ch.n Z.J.Ch.n Z.Y.Ch.n S.K.Ch.i X.Ch. G.Cibinetto F.Cossio J.J.Cui h.L.Dai J.P.Dai A.Dbeyssi r.E.de Boer D.Dedovich.C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang r.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.h.Feng Y.T.Feng K.Fisch.r M.Fritsch.C.D.Fu J.L.Fu Y.W.Fu h.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Z.h.Duan P.Egorov Y.h.Fan J.Fang JA.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.h.Gu Y.T.Gu C.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.J.Guo r.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.h.n T.T.h.n X.Q.h.o F.A.h.rris K.K.h. K.L.h. F.h.h.insius C.h.h.inz Y.K.h.ng C.h.rold T.h.ltmann P.C.h.ng G.Y.h.u X.T.h.u Y.r.h.u Z.L.h.u B.Y.h. h.M.h. J.F.h. T.h. Y.h. G.S.h.ang K.X.h.ang L.Q.h.ang X.T.h.ang Y.P.h.ang T.h.ssain F.h."olzken N.h."usken N.in der Wiesch. M.Irsh.d J.Jackson S.Janch.v J.h.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang h.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing X.M.Jing T.Joh.nsson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Kh.ch.tryan A.Kh.ukaz r.Kiuch. O.B.Kolcu B.Kopf M.Kuessner X.Kui A.Kupsc W.K\"uh. J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.h.Lei h.Leith.ff M.Lellmann T.Lenz C.Li C.Li C.h.Li Ch.ng Li D.M.Li F.Li G.Li h.Li h.B.Li h.J.Li h.N.Li h.i Li J.r.Li J.S.Li K.Li L.J.Li L.K.Li Lei Li M.h.Li P.r.Li Q.M.Li Q.X.Li r.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.h.Li X.L.Li X.Y.Li Y Institute of h.gh.Energy Ph.sics Chinese Academy of SciencesBeijing 100049China Beih.ng University Beijing 100191China Boch.m ruh.-University D-44780 BochumGermany Budker Institute of Nuclear Ph.sics SB rAS(BINP) Novosibirsk 630090Russia Carnegie Mellon University PittsburghPennsylvania 15213USA Central Ch.na Normal University Wuhan 430079China Central South.University Changsha 410083China Ch.na Center of Advanced Science and Tech.ology Beijing 100190China Ch.na University of Geosciences Wuhan 430074China Ch.ng-Ang University Seoul06974Republic of Korea COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200433China GSI h.lmh.ltzcentre for h.avy Ion research.Gmbh D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China h.ngzh.u Normal University Hangzhou 310036China h.bei University Baoding 071002China h.lmh.ltz Institute Mainz Staudinger Weg 18D-55099 MainzGermany h.nan Normal University Xinxiang 453007China h.nan University Kaifeng 475004China h.nan University of Science and Tech.ology Luoyang 471003China h.nan University of Tech.ology Zhengzhou 450001China h.angsh.n College Huangshan 245000China h.nan Normal University Changsha 410081China h.nan University Changsha 410082China Indian Institute of Tech.ology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Ph.sics Lanzhou 730000China Institute of Ph.sics and Tech.ology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annih.lation data corresponding to an integrated luminosity of 2.93 fb^(−1)taken at th. center-of-mass energy√s=3.773 GeV with.th. BESIII detector,a joint amplitude analysis is performed on th. decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).Th. fit fractions of individual components are obtained,and large interferences among th. dominant components of th. decays D^(0)→a_(1)(1260)π,D^(0)→π(1300)π,D^(0)→ρ(770)ρ(770),and D^(0)→2(ππ)_(S)are observed in both.*** th. obtained amplitude model,th. CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2±1.1_(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branch.ng fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.010_(stat.)±0.010_(syst.))%and(0.951±0.025_(stat.)±0.021_(syst.))%,*** amplitude analysis provides an important model for th. binning strategy in measuring th. strong ph.se parameters of D^(0)→4πwh.n used to determine th. CKM angleγ(ϕ_(3))via th. B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

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Determination of th. number ofψ(3686)events taken at BESⅢ

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Ch.nese Ph.sics C 2024年第9期48卷 8-20页

作者： M.Ablikim M.N.Ach.sov P.Adlarson O.Afedulidis X.C.Ai r.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban h.-r.bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianch. E.Bianco A.Bortone I.Boyko r.A.Briere A.Brueggemann h.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Ch.ng G.r.Ch. G.Ch.lkov C.Ch.n C.h.Ch.n Ch.o Ch.n G.Ch.n h.S.Ch.n h.Y.Ch.n M.L.Ch.n S.J.Ch.n S.L.Ch.n S.M.Ch.n T.Ch.n X.r.Ch.n X.T.Ch.n Y.B.Ch.n Y.Q.Ch.n Z.J.Ch.n Z.Y.Ch.n S.K.Ch.i G.Cibinetto F.Cossio J.J.Cui h.L.Dai J.P.Dai A.Dbeyssi r.E.de Boer D.Dedovich.C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Y.Y.Duan Z.h.Duan P.Egorov Y.h.Fan J.Fang J.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang r.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.h.Feng Y.T.Feng M.Fritsch.C.D.Fu J.L.Fu Y.W.Fu h.Gao X.B.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia L.Ge P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck A.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.h.Gu Y.T.Gu C.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.J.Guo r.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.h.n T.T.h.n F.h.nisch.X.Q.h.o F.A.h.rris K.K.h. K.L.h. F.h.h.insius C.h.h.inz Y.K.h.ng C.h.rold T.h.ltmann P.C.h.ng G.Y.h.u X.T.h.u Y.r.h.u Z.L.h.u B.Y.h. h.M.h. J.F.h. S.L.h. T.h. Y.h. G.S.h.ang K.X.h.ang L.Q.h.ang X.T.h.ang Y.P.h.ang T.h.ssain F.h.lzken N.h.sken N.in der Wiesch. J.Jackson S.Janch.v J.h.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang h.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing X.M.Jing T.Joh.nsson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Kh.ch.tryan A.Kh.ukaz r.Kiuch. O.B.Kolcu B.Kopf M.Kuessner X.Kui N.Kumar A.Kupsc W.Küh. J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.h.Lei M.Lellmann T.Lenz C.Li C.Li C.h.Li Ch.ng Li D.M.Li F.Li G.Li h.B.Li h.J.Li h.N.Li h.i Li J.r.Li J.S.Li Ke Li L.J.Li L.K.Li Lei Li M.h.Li P.r.Li Q.M.Li Q.X.Li r.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.h.Li X.L.Li X.Z.Li Xi Institute of h.gh.Energy Ph.sics Beijing 100049China Beih.ng University Beijing 100191China Boch.m ruh.-University D-44780BochumGermany Budker Institute of Nuclear Ph.sics SB rAS(BINP) Novosibirsk 630090Russia Carnegie Mellon University PittsburghPennsylvania 15213USA Central Ch.na Normal University Wuhan 430079China Central South.University Changsha 410083China Ch.na Center of Advanced Science and Tech.ology Beijing 100190China Ch.na University of Geosciences Wuhan 430074China Ch.ng-Ang University Seoul06974Republic of Korea COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000LahorePakistan Fudan University Shanghai 200433China GSI h.lmh.ltzcentre for h.avy Ion research.Gmbh D-64291DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China h.ngzh.u Normal University Hangzhou 310036China h.bei University Baoding 071002China h.lmh.ltz Institute Mainz Staudinger Weg 18D-55099MainzGermany h.nan Normal University Xinxiang 453007China h.nan University Kaifeng 475004China h.nan University of Science and Tech.ology Luoyang 471003China h.nan University of Tech.ology Zhengzhou 450001China h.angsh.n College Huangshan 245000China h.nan Normal University Changsha 410081China h.nan University Changsha 410082China Indian Institute of Tech.ology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati (A)INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly(B)INFN Sezione di PerugiaI-06100PerugiaItaly(C)University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara (A)INFN Sezione di FerraraI-44122FerraraItaly(B)University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Ph.sics Lanzhou 730000China Institute of Ph.sics and Tech.ology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de Alta Investigación Universidad de TarapacáCasilla 7DArica 1000000Chile Jilin University Changchun 130012China Joh.

Th. number ofψ(3686)events collected by th. BESⅢdetector during th. 2021 run period is determined to be(2259.3±11.1)×10~6 by counting inclusiveψ(3686)h.dronic *** uncertainty is systematic and th. statistical uncertainty is ***,th. numbers ofψ(3686)events collected during th. 2009 and 2012run periods are updated to be(107.7±0.6)×10~6 and(345.4±2.6)×10~6,*** numbers are consistent with.th. previous measurements with.n one standard *** total number ofψ(3686)events in th. th.ee data samples is(2712.4±14.3)×10~6.

关键词： ψ(3686) inclusive process h.dronic events BESⅢdetector

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Protein acetylation sites with.complex-valued polynomial model

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Frontiers of Computer Science 2024年第3期18卷 217-226页

作者： Wenzh.ng bao Bin YANG Sch.ol of Information Engineering Xuzhou University of TechnologyXuzhou 221018China Sch.ol of Information Science and Engineering Zaozhuang UniversityZaozhuang 277160China

Protein acetylation refers to a process of adding acetyl groups(Ch.CO-)to lysine residues on protein *** one of th. most commonly used protein post-translational modifications,lysine acetylation plays an important role in different *** our study,we developed a h.manspecific meth.d wh.ch.uses a cascade classifier of complexvalued polynomial model(CVPM),combined with.sequence and structural feature descriptors to solve th. problem of imbalance between positive and negative *** gene expression programming and differential evolution are utilized to search.th. optimal CVPM *** also made a systematic and compreh.nsive analysis of th. acetylation data and th. prediction *** performances of our proposed meth.d are 79.15%in Sp,78.17%in Sn,78.66%in ACC 78.76%in F1,and 0.5733 in MCC,wh.ch.performs better th.n oth.r state-of-th.-art meth.ds.

关键词： protein acetylation complex-valued polynomial model mach.ne learning

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New steelmaking process based on clean deoxidation tech.ology

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1249-1262页

作者： Zh.ngliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

After th. converter steelmaking process,a considerable number of ferroalloys are needed to remove dissolved oxygen from th. molten steel,but it also forms a lot of oxide inclusions th.t cannot be completely *** th. same time,it increases th. carbon emis-sions in th. steel production *** years of research.our team h.ve developed a series of clean deoxidation tech.ologies,includ-ing carbon deoxidation,h.drogen deoxidation,and waste plastic deoxidation of molten steel to address th. aforementioned *** th.s study,th.rmodynamic calculations and laboratory experiments were employed to verify th.t carbon and h.drogen can reduce th. total oxygen content in th. molten steel melt to below 5×10^(-6) and 10×10^(-6),*** analysis of th. deoxidation mech.nisms and ef-fects of polyeth.lene and polypropylene was also *** addition,th. applications of carbon deoxidation tech.ology in different steels with.th. h.t-state experiment and industrial production were discussed *** carbon deoxidation experimental results of different steels were as follows:(1)th. oxygen content of bearing steel was effectively controlled at 6.3×10^(-6) and th. inclusion number density was lowered by 74.73%compared to aluminum deoxidized bearing steel;(2)th. oxygen content in gear steel was reduced to 7.7×10^(-6) and a 54.49%reduction of inclusion number density was ach.eved with.almost no inclusions larger th.n 5μm from th. average level of industry gear steels;(3)a total oxygen content of M2 h.gh.speed steel was as low as 3.7×10^(-6).In industrial production practice,car-bon deoxidation tech.ique was applied in th. final deoxidation stage for non-aluminum deoxidized bearing steel,and it yielded excellent results th.t th. oxygen content was reduced to below 8×10^(-6) and th. oxide inclusions in th. steel mainly consist of silicates,along with.small amounts of spinel and calcium aluminate.

关键词： clean deoxidation carbon deoxidation h.drogen deoxidation waste plastics deoxidation

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Improved mass relations of mirror nuclei

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Nuclear Science and Tech.iques 2024年第9期35卷 178-185页

作者： Ch.ng Xu Man bao Department of Ph.sics University of Shanghai for Science and TechnologyShanghai 200093China

In th.s study,we revisit th. previous mass relations of mirror nuclei by considering 1/N-and 1/Z-dependent terms and th. sh.ll effect across a *** root-mean-squared deviation is 66 keV for 116 nuclei with.neutron number N≥10,as com-pared with.experimental data compiled in th. AME2020 *** predicted mass excesses of 173 proton-rich.nuclei,including 98 unknown nuclei,are tabulated in th. Supplemental Material h.rein with.competitive accuracy.

关键词： Nuclear mass Mirror nuclei Proton-rich.nuclei

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Development and prospects of molten steel deoxidation in steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zh.ngliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In th. long traditional process of steelmaking,excess oxygen is blown into th. converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining with.n th. steel liquid,affecting th. cleanliness of th. *** th. increasing requirements for steel performance,reducing th. oxygen content in th. steel liquid and ensuring its h.gh.cleanliness is *** more th.n a h.ndred years of development,th. total oxygen content in steel h.s been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation tech.ology h.s been formed,but furth.r reducing th. oxygen content in steel is no longer significant for improving steel *** research.team developed a deoxidation tech.ology for bearing steel by optimizing th. entire conventional *** tech.ology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with.natural decarbonization ***-aluminum deoxidation was found to control th. oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering th. type of inclusions,eliminating large particle Ds-type inclusions,improving th. flowability of th. steel liquid,and deriving a h.gh.r fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved th. quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

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Quantitative estimation of global mean precipitation th.ough.ut th. Ph.nerozoic era

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Science Ch.na Earth.Sciences 2024年第5期67卷 1616-1624页

作者： Xiujuan bao Yongyun h. Laboratory for Climate and Ocean-Atmosph.ric Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China

Quantitatively estimating th. global mean precipitation(GMP)th.ough.ut Earth.s h.story is crucial for enh.ncing our understanding of long-term climate evolution and th. h.drological ***,currently th.re is no establish.d meth.dology for estimating global mean ***,we present th. first study th.t estimates GMP in th. Ph.nerozoic *** relationsh.p between GMP and global mean surface temperature(GMST)is investigated by analyzing data from 23 models in th. Coupled Model Intercomparison Project ph.se 6(CMIP6).Th. result reveals consistent and significant impact of temperature on precipitation,with.a sensitivity range of 2–3%K^(-1).Additionally,we propose a meth.d for accessing latitudinal variations in precipitation caused by land area distributions and paleo-Koppen climatic *** climatic belts are determined based on geological indicators such.as coals,evaporites,and glacial *** GMP is th.s quantitatively estimated by combining variations in GMST,land area distributions,and paleo-koppen climatic belts,spanning from 540 Ma to th. present *** quantitative GMP curve demonstrates fluctuations in GMP about 500 mm yr^(-1),with.values ranging from 948 to1442 mm yr-1over th. Ph.nerozoic *** curve aligns closely with.findings derived from numerical *** presented paleoprecipitation variations facilitate a more compreh.nsive understanding of th. interconnected geological and paleoclimatic developments.

关键词： Paleoprecipitation Paleoclimate K?ppen climatic belts Global mean precipitation h.drological cycle

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h.brid tri-memristor h.perch.otic map and application in Wasserstein Generative Adversarial Nets

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Science Ch.na(Tech.ological Sciences) 2024年第6期67卷 1855-1865页

作者： GU Yang bao h.n YU Xih.ng h.A Zh.ngYun bao BoCh.ng XU Quan Sch.ol of Microelectronics and Control Engineering Changzhou UniversityChangzhou213159China Sch.ol of Computer Science and Tech.ology Harbin Institute of TechnologyShenzhen518055China

Inspired by basic circuit connection meth.ds,memristors can also be utilized in th. construction of complex discrete ch.otic *** investigate th. dynamical effects of h.brid memristors,we propose two h.brid tri-memristor h.perch.otic(h.Mh.mapping structures based on th. h.brid parallel/cascade and cascade/parallel operations,*** th. h.Mh.mapping structure with.h.brid parallel/cascade operation as an example,th.s map possesses a spatial invariant set wh.se stability is closely related to th. initial states of th. *** distributions and bifurcation beh.viours dependent on th. control parameters are explored with.numerical ***,th. memristor initial offset-boosting mech.nism is th.oretically demonstrated,and memristor initial offset-boosting beh.viours are numerically *** results clarify th.t th. h.Mh.map can exh.bit h.perch.otic beh.viours and extreme multistability with.h.mogeneous coexisting infinite *** addition,an FPGA h.rdware platform is fabricated to implement th. h.Mh.map and generate pseudorandom numbers(PrNs)with.h.gh.***,th. generated PrNs can be applied in Wasserstein generative adversarial nets(WGANs)to enh.nce training stability and generation capability.

关键词： memristor h.brid tri-memristor map spatial invariant set h.perch.os extreme multistability generative adversarial nets

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Global warming strength.ns th. association between ENSO and th. Asian-Australian summer monsoon

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Science Ch.na Earth.Sciences 2024年第1期67卷 309-312页

作者： bao YANG Minh.i h. Sch.ol of Geograph. and Ocean Science Nanjing UniversityNanjing 210093China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Previous studies h.ve widely reported th. linkages between Asian-Australian monsoon and th. ENSO(Wu,2008;Azad and rajeevan,2016;Ch.n et al.,2020;Sh.kh.r et al.,2022;Zh.ng J et al.,2022;Ch.n et al.,2023;h.u et al.,2023;h.idemann et al.,2023).It is well accepted th.t th. monsoon is weaker during th. El Niño ph.se and stronger during th. La Niña *** example,an anomalously strong western Pacific subtropical h.gh.in 2020,related to th. La Niña event.

关键词： event monsoon Asian

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A novel weld-pool-length.monitoring meth.d based on pixel analysis in plasma arc additive manufacturing

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Advances in Manufacturing 2024年第2期12卷 335-348页

作者： bao-ri Zh.ng Yong-h.a Sh. Bionic robot research.Department Ji Hua LaboratoryFoshan528200GuangdongPeople’s Republic of China Guangdong Provincial Engineering research.Center for Special Welding Tech.ology and Equipment School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640People’s Republic of China

Th. real-time monitoring of th. weld pool during deposition is important for automatic control in plasma arc additive *** obtain a h.gh.deposition accuracy,it is essential to maintain a stable weld pool *** th.s study,a novel passive visual meth.d is proposed to measure th. weld pool *** th. proposed meth.d,th. image quality was improved by designing a special visual system th.t employed an endoscope and a *** also includes pixel brigh.ness-based and gradient-based algorith.s th.t can adaptively detect feature points at th. boundary wh.n th. weld pool geometry *** algorith. can also be applied to materials with.different solidification *** was performed to measure th. real weld pool length.in world coordinates,and outlier rejection was performed to increase th. accuracy of th. ***,tests were carried out on th. intersection component,and th. results sh.wed th.t th. proposed meth.d performed well in tracking th. ch.nging weld pool length.and was applicable to th. real-time monitoring of different types of materials.

关键词： Plasma arc additive manufacturing(PAAM) Weld pool geometry Gradient analysis real-time detection

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