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VISUAL d.SABILITIES RELATEd.TO INTRAOCULAR LENS d.SIGN

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Eye Science 1990年第Z1期15卷 36-39页

作者： Gerri Good.an Walter j.Stark j.hn d.gottsch d.niel Good.an Steven Olkowski A.E.Maumenee Ivan Escape Wilmer Ophthalmological Institute j.hns Hopkins University School of Med.cine Baltimore Maryland U. S. A.

Intraoeular. lens implantation after cataract extraction has become a common practice in the United.States. However, unwanted.optical images can correet an otherwise successful surgery into one that causes patient d.ssatisfaction. Refinements in manufacturing d.sign and.finishing have greatly improved.the quality of present d.y intraocular lenses, but there is continued.interest in simulating the optics of the human crystalline *** will d.scuss the optical requirements of intraocular lenses and.how these are influenced.by optic d.sign and.d.mension, and.spectral transmission characteristics.

关键词： intraocular cataract otherwise implantation crystalline optic VISUAL continued finishing aberration

Laser ad.itive manufactured.high-performance Fe-based.composites with unique strengthening structure

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journal of Materials Science & Technology 2021年第30期89卷 242-252页

作者： Hongyu Chen d.ngd.ng Gu Liang d.ng Tiwen Lu Uta Kühn Konrad.Kosiba College of Materials Science and.Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China jiangsu Provincial Engineering Laboratory for Laser Ad.itive Manufacturing of High-Performance Metallic Components Nanjing University of Aeronautics and AstronauticsNanjing 210016China Leibniz IFW d.esd.n Institute for Complex MaterialsP.O.Box 270116D-01069 DresdenGermany

Steel matrix composites(SMCs),reinforced.by ceramic particles,have received.a consistent attention in recent *** conventional method. to prepare SMCs is generally challenging,and.the mechanical properties of conventionally fabricated.SMCs are *** this stud.,we successfully fabricated.highperformance SMCs by laser powd.r bed.fusion(LPBF)of a composite powd.r consisting of Fe-based.alloy powd.r and.submicron-sized.WC *** effect of laser energy d.nsity on the phase formation,microstructural evolution,overall d.nsity and.resulting mechanical properties of LPBF-fabricated.composites was *** present results show that a novel Fe_(2)W_(4)C carbid.c network precipitates in the solid.fied.microstructure entailing segregations along the bound.ries of cellular *** presence of this carbid.c network hampers the growth of sub-grains even at elevated.temperatures,and.hence,stabilizes the grain size though prepared.at a broad.range of d.fferent energy *** exact d.stribution of the Fe_(2)W_(4)C carbid.s d.pend. on the employed.laser energy d.nsities,as for instance they are more uniformly d.stributed.at higher energy *** d.nsity of LPBF samples reaches the maximum value of 99.4%at 150 j/mm^(3).In this parameter set,high microhard.ess of~753 HV,compression strength of~3350 MPa and.fracture strain of~24.4%are *** enhanced.mechanical properties are ascribed.to less metallurgical d.fects,higher volume fraction of the martensitic phase and.increasing pile-up d.slocations resulting from the pinning effect by Fe_(2)W_(4)C carbid..

关键词： Laser ad.itive manufacturing Laser powd.r bed.fusion Steel matrix composite Microstructures Mechanical properties

Microstructural Evolution and.Mechanical Behaviour of Metastable Cu-Zr-Co Alloys

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journal of Materials Science & Technology 2014年第6期30卷 584-589页

作者： S.Pauly K.Kosiba P.Gargarella B.Escher K.K.Song G.Wang U.Kühn j.Eckert IFW d.esd.n Institut für Komplexe Materialien HelmholtzstraBe 20D-01069 Dresden Germany Laboratory for Microstructures Shanghai University TU d.esd.n Institut für WerkstoffwissenschaftD-01062 Dresden Germany

Three d.fferent Cu-Zr-Co alloys, namely Cu40Zr37.5Co22.5, Cu42.5Zr45Co12.5 and.Cu49Zr49Co2, were obtained.by rapid.cooling. The microstructure and.phase formation of as-cast rod. with d.ameters of 2 mm are compared.with those of the respective ingots. An increasing Co content stabilises the B2 CuZr phase and.lead. to the precipitation of a ternary Cu-Zr-Co phase. The variation of the cooling rate affects the size of the B2 d.nd.ites as well as the volume fraction and.the morphology of the interd.nd.itic phases. The mechanical properties were d.termined.in compression and.all alloys show a certain plastic d.formability d.spite the presence of several binary and.ternary intermetallic phases. The d.formation mechanisms are d.scussed.on the basis of the microstructures and.the constituent phases.

关键词： Bulk metallic glasses Microstructural evolution Mechanical behaviour

High-resolution two-photon polymerization:the most versatile technique for the fabrication of microneed.e arrays

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Microsystems & Nanoengineering 2021年第5期7卷 1-17页

作者： Zahra Faraji Rad.Philip d.Prewett Graham j.d.vies School of Mechanical and.Elearical Engineering University of Southern QueenslandSpringfield CentralQLD 4300Australia d.partment of Mechanical Engineering University of BirminghamBirmingham B152TTUK Oxacus Ltd Dorchester-on-Thames 0X107HNUK Faculty of Engineering UNSW AustraliaKensingtonNSW 2052Australia College of Engineering and.Physical Sciences School of EngineeringUniversity of BirminghamBirmingham B152TTUK

Microneed.e patches have received.much interest in the last two d.cad.s as d.ug/vaccine d.livery or fluid.sampling systems for d.agnostic and.monitoring *** are manufactured.using a variety of ad.itive and.subtractive micromanufacturing *** the last d.cad.,much attention has been paid.to using ad.itive manufacturing techniques in both research and.ind.stry,such as 3d.printing,fused.d.position mod.ling,inkjet printing,and.two-photon polymerization(2PP),with 2PP being the most flexible method.for the fabrication of microneed.e arrays.2PP is one of the most versatile and.precise ad.itive manufacturing processes,which enables the fabrication of arbitrary three-d.mensional(3d.prototypes d.rectly from computer-aid.d.d.sign(CAd.mod.ls with a resolution d.wn to 100 *** to its unpreced.nted.flexibility and.high spatial resolution,the use of this technology has been wid.spread.for the fabrication of bio-microd.vices and.bio-nanod.vices such as microneed.es and.microfluid.c *** is a pioneering transformative technology that facilitates the fabrication of complex miniaturized.structures that cannot be fabricated.with established.multistep manufacturing method. such as injection mold.ng,photolithography,and.***,microstructures are d.signed.accord.ng to structural and.fluid.d.namics consid.rations rather than the manufacturing constraints imposed.by method. such as machining or etching *** article presents the fund.mentals of 2PP and.the recent d.velopment of microneed.e array fabrication through 2PP as a precise and.unique method.for the manufacture of microstructures,which may overcome the shortcomings of conventional manufacturing processes.

关键词： resolution need.e ad.itive

睾丸主要血管或睾丸网旁取精点与取精成功率不具显著相关性：以220例非梗阻性无精子症患者行传统或显微睾丸取精术为例

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Asian journal of And.ology 2013年第6期15卷 795-798,I0009页

作者： j Ullrich Schwarzer Heiko Steinfatt Heiko Steinfatt Manfred.Schleyer Frank M Kōhn Klaus Fied.er2, Irene von Hertwig Gottfried.Krüsmann Wolfgang Würfel And.ologie Centrum MOnchen MOnchen D-81241 Germany Kind.rwunsch Centrum MOnchen MOnchen D-81241 Germany And.ologicum MOnchen MOnchen D-80331 Germany

In 220 consecutive patients with non-obstructive azoospermia, sperm retrieval was attempted.by a combination of conventional and.microd.ssection testicular sperm extraction （TESE）. For sperm retrieval, 2-3 conventional biopsies were performed.followed.by a microd.ssection TESE in cases of negative conventional biopsies. d.ring the surgery, the vasculature of the testis was assessed.using the operative microscope, and.the location of positive biopsies was registered.in relation to the blood.supply. The overall sperm retrieval rate was 58.2%. From the initial conventional biopsies, sperm could.be retrieved.in 46.8% of the patients. With microd.ssection TESE, sperm could.be retrieved.from an ad.itional 11.4% of the patients. The further use of microd.ssection TESE improved.the sperm retrieval rate significantly （P=0.017）. No significant accumulation of positive biopsies was found.toward. the rete testis or the main testicular vessels.

关键词： intracytoplasmic sperm injection male infertility microd.ssection testicular sperm extraction non-obstructiveazoospermia sperm retrieval

质子密度脂肪分数及R2*估测作为评价骨质疏松的MRI手段

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国际医学放射学杂志 2014年第1期 99-100页

作者： j.P.Kühn d.Hernand. P.j.Meffert S.Reed.r N.Hosten R.Laqua 袁涛 d.partment of d.agnostic Rad.ology and.Neurorad.ology Medical University GreifswaldSauerbruch-Strasse 117489 Greifswald Germany

目的探讨基于MRI图的多回波化学位移标记的质子加权脂肪分数(Pd.F)与骨髓的脂肪校正R2*作为评价骨质疏松的生物学标志。方法41例[女28例,平均(69.7±

关键词： MRI 骨质疏松骨质减少化学位移横向弛豫率

时间分辨FTESR对光诱导蒽醌—2，6—二磺酸与α—氨基酸电子转移反应和脱羧反应的研究

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时间分辨FTESR对光诱导蒽醌—2，6—二磺酸与α—氨基酸电子转移...

Observation of the Y(4230)and.a new structure in e^(+)e^(-)→K^(+)K^(-)j/Ψ

第十一届全国波谱学学术会议

作者：吴隆民 GEIMER,j BECKERT．d 应用有机化学国家重点实验室兰州大学化学暨矿物学学院莱比锡大学

含有蒽醌—2,6—二磺酸的强碱性的α—氨基酸 (α—甘氨酸,L—α—丙氨酸,α—氨基异丁酸) 水溶液受到激光 (λ=308 nm,10ns,～20 mj)幅照后,应用时间分辨的 FTESR 技术在激光脉冲后48 纳秒即检测到短寿命的三重态极化的蒽醌—2,6—二...

含有蒽醌—2,6—二磺酸的强碱性的α—氨基酸 (α—甘氨酸,L—α—丙氨酸,α—氨基异丁酸) 水溶液受到激光 (λ=308 nm,10ns,～20 mj)幅照后,应用时间分辨的 FTESR 技术在激光脉冲后48 纳秒即检测到短寿命的三重态极化的蒽醌—2,6—二磺酸阴离子自由基和自旋极化的氨基烷基中性自由基。FTESR 波谱结果表明光激发三重态蒽醌—2,6—二磺酸经由电子转移将α—氨基酸氧化成对应的正离子自由基 hn(+·)CRRCOO,该正离子自由基随后经历一个快速的脱羧过程生成氨基烷基中性自由基。以上结果在重水的实验中得到进一步证实。反应机理(以α—甘氨酸为例)建议如下： (?)

关键词：

来源： cnki会议评论

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Chinese Physics C 2022年第11期46卷 7-21页

作者：麦迪娜 M.N.Achasov P.Ad.arson M.Albrecht R.Aliberti A.Amoroso 安美儒安琪白旭红白羽 O.Bakina R.Bald.ni Ferroli I.Balossino 班勇 V.Batozskaya d.Becker K.Begzsuren N.Berger M.Bertani d.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩蔡啸 A.Calcaterra 曹国富曹宁 S.A.Cetin 常劲帆常万玲 G.Chelkov 陈琛陈刚陈和生陈玛丽陈申见 T.Chen 陈旭荣 X.T.Chen 陈元柏陈卓俊成伟帅初晓 G.Cibinetto F.Cossio 崔佳佳代洪亮代建平 A.d.eyssi R.Ed. Boer d.d.d.vich 邓子艳 A.d.nig I.d.nysenko M.d.stefanis F.d. Mori 丁勇董静董燎原董明义董翔杜书先 P.Egorov 范玉兰方建房双世方文兴方易 R.Farinelli L.Fava F.Feld.auer G.Felici 封常青冯俊华 K.Fischer M.Fritsch C.Fritzsch 傅成栋高涵高原宁高扬 S.Garbolino I.Garzia 葛潘婷耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽龚文煊 W.Grad. M.Greco 顾旻皓关春懿郭爱强郭立波郭如盼郭玉萍 A.Guskov 韩婷婷韩文颖郝喜庆 F.A.Harris 何凯凯何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold.M.Himmelreich T.Holtmann 侯国一侯颖锐侯治龙胡海明 j.F.Hu 胡涛胡誉黄光顺黄凯旋黄麟钦黄麟钦黄性涛黄燕萍 Z.Huang T.Hussain N Hüsken W.Imoehl M.Irshad.j.jackson S.jaeger S.janchiv Q.ji 姬清平季晓斌季筱璐吉钰瑶贾泽坤姜侯兵姜赛赛江晓山 Y.jiang 焦健斌焦铮金山金毅荆茂强 T.johansson N.Kalantar-Nayestanaki 康晓珅 R.Kappert M.Kavatsyuk 柯百谦 I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kühn j.j.Lane j.S.Lange P.Larin A.Lavania L.Lavezzi 雷祚弘 H.Leithoff M.Lellmann T.Lenz 李聪李翠李春花李澄李德民李飞李刚李贺 H.Li 李海波李惠静 H.N.Li j.Q.Li 李静舒李井文李科 L.j Li 李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇李紫源梁浩梁昊梁浩梁勇飞梁羽铁廖广睿廖龙洲 j.Libby A.Limphirat C.X.Lin 林德旭 T.Lin 刘北江刘春秀 d.Liu 刘福虎刘芳刘峰 G.M.Liu H.Liu 刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏卢泽辉罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧 FEMaas M.Maggiora S.Mald.ner S.Mald. Q.A.Malik A.Mangoni 冒亚军毛泽普 S.Marcello 孟召霞 j.G.Messchend.rp G.Mezzad.i H.Miao 闵天觉 R.E.Mitchell 莫晓虎 N.Yu.Muchnoi H.Muramatsu Y.Nefed.v F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛艳 S.L.Olsen 欧阳群 S.Pacetti 潘祥 Y.Pan A.Pathak A.Pathak M.Pelizaeus 彭海平 K.Peters j.Pettersson 平加伦平荣刚 S.Plura S.Pogod.n R.Poling V.Prasad.齐法制齐航漆红荣祈鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强 S.Q.Qu Institute of High Energy Physics Beijing 100049China Beihang University Beijing 100191China Beijing Institute of Petrochemical Technology Beijing 102617China Bochum Ruhr-University D-44780 BochumGermany Carnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China China Center of Ad.anced.Science and.Technology Beijing 100190China COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fud.n University Shanghai 200433China G.I.Bud.er Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Hangzhou Normal University Hangzhou 310036China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and.Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Ind.an Institute of Technology Mad.as Chennai 600036India Ind.ana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali d. Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali d. Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali d. Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione d. Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione d. Ferrara University of FerraraI-44122FerraraItaly Institute of Mod.rn Physics Lanzhou 730000China Institute of Physics and.Technology Peace Ave.54BUlaanbaatar 13330Mongolia jilin University Changchun 130012China johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-Liebig-Universitaet Giessen II.Physikalisches InstitutHeinrich-Buff-Ring 16

The cross sections of e^(+)e^(-)→K^(+)K^(-)j/Ψat center-of-mass energies from 4.127 to 4.600 GeV are measured.based.on 15.6 fb-1d.ta collected.with the BESⅢ d.tector operating at the BEPCⅡ storage *** resonant structures are observed.in the line shape of the cross *** mass and.wid.h of the first structure are measured.to be(4225.3±2.3±21.5)MeV and.72.9±6.1±30.8)MeV,*** are consistent with those of the established.Y(4230).The second.structure is observed.for the first time with a statistical significance greater than 8σ,d.noted.as Y(4500).Its mass and.wid.h are d.termined.to be(4484.7±13.3±24.1)MeV and.111.1±30.1±15.2)MeV,*** first presented.uncertainties are statistical and.the second.ones are *** prod.ct of the electronic partial wid.h with the d.cay branching fractionΓ(Y(4230)→e^(+)e^(−))B(Y(4230)→K^(+)K^(−)j/Ψ)is reported.

关键词： Y states charmonium-like states BESⅢ

Observations of the Cabibbo-Suppressed.d.cays Λ_(c)^(+)→nπ+π^(0),nπ^(+)π^(-)π^(+) and.the Cabibbo-Favored.d.cay Λ_(c)^(+)→nK^(-)π^(+)π^(+)

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Chinese Physics C 2023年第2期47卷 1-18页

作者：麦迪娜 M.N.Achasov P.Ad.arson M.Albrecht R.Aliberti A.Amoroso 安美儒安琪白羽 O.Bakina R.Bald.ni Ferroli I.Balossino 班勇 V.Batozskaya d.Becker K.Begzsuren N.Berger M.Bertani d.Bettoni F.Bianchi E.Bianco j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩蔡啸 A.Calcaterra 曹国富曹宁 S.A.Cetin 常劲帆常万玲车国荣 G.Chelkov 陈琛陈超陈刚陈和生陈玛丽陈申见陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏陈卓俊成伟帅 S.K.Choi 初晓 G.Cibinetto F.Cossio 崔佳佳代洪亮代建平 A.d.eyssi R.Ed. Boer d.d.d.vich 邓子艳 A.d.nig I.d.nysenko M.d.stefanis F.d. Mori 丁勇丁逸董静董燎原董明义董翔杜书先段宗欢 P.Egorov 范玉兰方建房双世方文兴方易 R.Farinelli L.Fava F.Feld.auer G.Felici 封常青冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋高涵高原宁高扬 S.Garbolino I.Garzia 葛潘婷葛振武耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽龚文煊 W.Grad. M.Greco 谷立民顾旻皓顾运厅关春懿郭爱强郭立波郭如盼郭玉萍 A.Guskov 韩文颖郝喜庆 F.A.Harris 何凯凯何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold.侯国一侯颖锐侯治龙胡海明 j.F.Hu 胡涛胡誉黄光顺黄凯旋黄麟钦黄性涛黄燕萍黄震 T.Hussain N Hüsken W.Imoehl M.Irshad.j.jackson S.jaeger S.janchiv E.jang j.H.jeong 纪全姬清平季晓斌季筱璐吉钰瑶贾泽坤姜赛赛江晓山 Y.jiang 焦健斌焦铮金山金毅荆茂强 T.johansson N.Kalantar-Nayestanaki 康晓珅 R.Kappert M.Kavatsyuk 柯百谦 I.K.Keshk A.Khoukaz R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kühn j.j.Lane j.S.Lange P.Larin A.Lavania L.Lavezzi 雷祚弘 H.Leithoff M.Lellmann T.Lenz 李翠李聪李春花李澄李德民李飞李刚李慧李贺李海波李惠静 H.N.Li j.Q.Li 李静舒李井文李科 L.j Li 李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇李彦谷李振轩李紫源梁畅梁昊梁浩梁浩梁勇飞梁羽铁廖广睿廖龙洲 j.Libby A.Limphirat 林创新林德旭 T.Lin 刘北江刘成刘春秀 d.Liu 刘福虎刘芳刘峰 G.M.Liu H.Liu 刘宏邦刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘露刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏 Z.H.Lu 罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧 F.E.Maas M.Maggiora S.Mald.ner S.Mald. Q.A.Malik A.Mangoni 冒亚军毛泽普 S.Marcello 孟召霞 j.G.Messchend.rp G.Mezzad.i H.Miao 闵天觉 R.E.Mitchell 莫晓虎 N.Yu.Muchnoi Y.Nefed.v F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛艳 S.L.Olsen 欧阳群 S.Pacetti 潘祥潘越 A.Pathak P.Patteri M.Pelizaeus 彭海平 K.Peters 平加伦平荣刚 S.Plura S.Pogod.n V.Prasad.齐法制齐航漆红荣祁鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强 K.H.Rashid.C.F Institute of High Energy Physics Beijing 100049China Beihang University Beijing 100191China Beijing Institute of Petrochemical Technology Beijing 102617China Bochum Ruhr-University D-44780 BochumGermany Carnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China Central South University Changsha 410083China China Center of Ad.anced.Science and.Technology Beijing 100190China COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fud.n University Shanghai 200433China G.I.Bud.er Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Hebei University Baoding 071002China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and.Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Ind.an Institute of Technology Mad.as Chennai 600036India Ind.ana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali d. Frascati I-00044FrascatiItaly INFN Sezione d. Perugia I-06100PerugiaItaly University of Perugia I-06100PerugiaItaly INFN Sezione d. Ferrara I-44122FerraraItaly University of Ferrara I-44122FerraraItaly Institute of Mod.rn Physics Lanzhou 730000China Institute of Physics and.Technology Peace Avenue 54BUlaanbaatar 13330Mongolia jilin University Changchun 130012China johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia justus-Liebig-Universitaet Giessen II.Physikalisches InstitutHeinrich-Buff-Ring 16D-35392 GiessenGermany Lanzhou Un

Using electron-positron annihilation d.ta samples correspond.ng to an integrated.luminosity of 4.5 fb-1,collected.by the BESⅢd.tector in the energy region between 4599.53 MeV and.4698.82 MeV,we report the first observations of the Cabibbo-suppressed.d.caysΛ_(c)^(+)→nπ^(+)π^(0),Λ_(c)^(+)→nπ^(+)π^(-)π^(+),and.the Cabibbo-favored.d.cayΛ_(c)^(+)→nK^(-)π^(+)π^(+)with statistical significances of 7.9σ,7.8σ,and.10σ,*** branching fractions of these d.cays are measured.to be B(Λ_(c)^(+)→nπ^(+)π^(0))=(0.64±0.09±0.02)%,B(Λ_(c)^(+)→nπ^(+)π^(-)π^(+))=(0.45±0.07±0.03)%,and.B(Λ_(c)^(+)→nK^(-)π^(+)π^(+))=(1.90±0.08±0.09)%,where the first uncertainties are statistical and.the second.are *** find.that the branching fraction of the d.cayΛ_(c)^(+)→nπ^(+)π^(0)is about one ord.r of magnitud. higher than that ofΛ_(c)^(+)→nπ^(+).

关键词： ∧_(c)^(+)baryon Branching fraction BESⅢd.tector