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Phase Formation and magnetic Properties of Nanocomposite Nd-Fe-b Adjusted by small Amount of dy and Co

Journal of Rare Earths 2004年第z2期22卷 89-94页

作者： t s jang t w lim h s aum d h lee m b kim division of materials and Chemical Engineering Sun Moon UniversityKorea Division of Materials and Chemical EngineeringSun Moon UniversityKorea Division of Mechanical EngineeringSun Moon University 100 Kalsan LiTangjung MyonAsan CityChoongnam 336-708Korea Division of Materials and Chemical EngineeringSun Moon UniversityKorea Division of Materials and Chemical EngineeringSun Moon UniversityKorea

In order to improve and stabilize the magnetic properties of nanocomposite Nd2Fe14b/α-Fe magnetic alloys by a compositional adjustment, small amount of dy and/or Co was added to Nd9Fe84b7 alloys. dtA analysis on the amorphous of the alloys took place as the soft magnetic phases were crystallized, and then the hard magnetic Nd2Fe14b was precipitated from them. while α-Fe and a metastable 1:7 (tbCu7-type) phase were formed simultaneously in dy and Co-free alloys, they were crystallized separately at different temperatures after dy or Co was added. this phase separation occurred more clearly in the dy-treated alloys and the other soft magnetic phase Fe3b was also stabilized by dy and/or Co. the 1: 7 phase that was stabilized by dy and/or Co was not eliminated at 700 ℃, decreasing magnetic properties of the alloys. It was eventually disappeared above 725 ℃, but Fe3b was not eliminated even at 750 ℃ when dy was added more than 0.5 at% or Co was added more than 2.0 at%. Amount of Nd2Fe14b in the alloys tended to increase as dy addition increased,whereas Co addition did not lead to any appreciable change in the ratio of α-Fe and Nd2Fe14b. moreover, dy addition apparently increased coercivity of an alloy while Co addition had a beneficial effect on remanence. the grains in the dytreated alloys were usually finer than those in the Co-treated alloys. the grain size of both α-Fe and Nd2Fe14b in the alloys exhibiting mr ≥ 0.72 was in the range of 20 ～ 40 nm or even larger 50 nm, which is larger than the theoretical optimum size ( ～ 10 nm). typical magnetic properties obtained from a Nd7.5dy1.5Fe82.5Co1.5b7 alloy annealed for 12 min at 725 ℃were ihc=4.85 kOe, br= 11.32 kG, (bh)max = 15.73 mGOe, and mr=0.73.

关键词： nanocomposite Nd-Fe-b magnetic properties remanence coercivity

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measurement of the integrated luminosity of the Phase 2 data of the belle Ⅱ experiment

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Chinese Physics C 2020年第2期44卷 1-12页

作者： F.Abudinén I.Adachi P.Ahlburg h.Aihara N.Akopov A.Aloisio F.Ameli L.Andricek N.Anh Ky d.m.Asner h.Atmacan t.Aushev V.Aushev t.Aziz K.Azmi V.babu s.baehr s.bahinipati A.m.bakich P.bambade sw.banerjee s.bansal V.bansal m.barrett J.baudot A.beaulieu J.becker P.K.behera J.V.bennett E.bernieri F.U.bernlochner m.bertemes m.bessner s.bettarini V.bhardwaj F.bianchi t.bilka s.bilokin d.biswas G.bonvicini A.bozek m.bračko P.branchini N.braun t.E.browder A.budano s.bussino m.Campajola L.Cao G.Casarosa C.Cecchi d.Červenkov m.-C.Chang P.Chang R.Cheaib V.Chekelian Y.Q.Chen Y.-t.Chen b.G.Cheon K.Chilikin h.-E.Cho K.Cho s.Cho s.-K.Choi s.Choudhury d.Cinabro L.Corona L.m.Cremaldi s.Cunliffe t.Czank F.dattola E.de La Cruz-burelo G.de Nardo m.de Nuccio G.de Pietro R.de sangro m.destefanis s.dey A.de Yta-hernandez F.di Capua s.di Carlo J.dingfelder Z.doležal I.domínguez Jiménez t.V.dong K.dort s.dubey s.duell s.Eidelman m.Eliachevitch t.Ferber d.Ferlewicz G.Finocchiaro s.Fiore A.Fodor F.Forti A.Frey b.G.Fulsom m.Gabriel E.Ganiev m.Garcia-hernandez R.Garg A.Garmash V.Gaur A.Gaz U.Gebauer A.Gellrich J.Gemmler t.Geßler R.Giordano A.Giri b.Gobbo R.Godang P.Goldenzweig b.Golob P.Gomis P.Grace w.Gradl E.Graziani d.Greenwald C.hadjivasiliou s.halder K.hara t.hara O.hartbrich K.hayasaka h.hayashii C.hearty m.t.hedges I.heredia de la Cruz m.hernández Villanueva A.hershenhorn t.higuchi E.C.hill h.hirata m.hoek s.hollitt t.hotta C.-L.hsu Y.hu K.huang t.Iijima K.Inami G.Inguglia J.Irakkathil Jabbar A.Ishikawa R.Itoh m.Iwasaki Y.Iwasaki s.Iwata P.Jackson w.w.Jacobs d.E.Jaffe E.-J.jang h.b.Jeon s.Jia Y.Jin C.Joo J.Kahn h.Kakuno A.b.Kaliyar G.Karyan Y.Kato t.Kawasaki h.Kichimi C.Kiesling b.h.kim C.-h.kim d.Y.kim s.-h.kim Y.K.kim Y.kim t.d.kimmel K.Kinoshita C.Kleinwort b.Knysh P.Kodyš t.Koga I.Komarov t.Konno s.Korpar d.Kotchetkov N.Kovalchuk t.m.G.Kraetzschmar P.Križan R.Kroeger J.F.Krohn P.Krokovny w.Kuehn t.Kuhr m.Kumar R.Kumar K.Kumara s.Kurz A.Kuzmin Y.-J.Kwon s.Lacaprara Y.-t.Lai C.La Licata K.Lalwani L.Lanceri J.s.Lange K.Lautenbach I.-s.Le beihang University Beijing 100191 brookhaven National Laboratory UptonNew York 11973 budker Institute of Nuclear Physics sb RAs Novosibirsk 630090 Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional Mexico City 07360 Faculty of mathematics and Physics Charles University12116 Prague Chiba University Chiba 263-8522 Consejo Nacional de Ciencia y tecnología Mexico City 03940 deutsches Elektronen–synchrotron 22607 Hamburg duke University DurhamNorth Carolina 27708 Earthquake Research Institute University of TokyoTokyo 113-0032 Forschungszentrum Jülich 52425 Jülich department of Physics Fu Jen Catholic UniversityTaipei 24205 Key Laboratory of Nuclear Physics and Ion-beam Application(mOE)and Institute of modern Physics Fudan UniversityShanghai 200443 II.Physikalisches Institut Georg-August-Universität Göttingen37073 Göttingen Gifu University Gifu 501-1193 the Graduate University for Advanced studies(sOKENdAI) Hayama 240-0193 Gyeongsang National University Jinju 52828 department of Physics and Institute of Natural sciences Hanyang UniversitySeoul 04763 high Energy Accelerator Research Organization(KEK) Tsukuba 305-0801 J-PARC branch KEK Theory CenterHigh Energy Accelerator Research Organization(KEK)Tsukuba 305-0801 Indian Institute of science Education and Research mohali SAS Nagar140306 Indian Institute of technology bhubaneswar Satya Nagar 751007 Indian Institute of technology hyderabad Telangana 502285 Indian Institute of technology madras Chennai 600036 Indiana University BloomingtonIndiana 47408 Institute for high Energy Physics Protvino 142281 Institute of high Energy Physics Vienna 1050 Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049 Institute of Particle Physics(Canada) VictoriaBritish Columbia V8W 2Y2 Institute of Physics Hanoi Instituto de Fisica Corpuscular Paterna 46980 INFN Laboratori Nazionali di Frascati I-00044 Frascati INFN sezione di Napoli I-80126 Napoli INFN sezione di Padova I-35131 Padova INFN sezione di Perugia I-06123 Perugia

From April to July 2018,a data sample at the peak energy of the t(4 s) resonance was collected with the belle Ⅱ detector at the superKEKb electron-positron *** is the first data sample of the belle Ⅱ *** bhabha and digamma events,we measure the integrated luminosity of the data sample to be(496.3±0.3±3.0) pb-1,where the first uncertainty is statistical and the second is *** work provides a basis for future luminosity measurements at belle Ⅱ.

关键词： luminosity bhabha digamma belle II

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鉴别胰腺内副脾与小的(<3cm)实性胰腺肿瘤:mR扩散加权成像的价值

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国际医学放射学杂志 2013年第2期 163-164页

作者： K.m. jang s.h. kim s. J. lee m.J. Park m.h. lee d. Choi 郭凌飞 department of Radiology and Center for Imaging science Samsung Medical Center Sungkyunkwan University School of Medicine 50 Ilwon-dong Gangnam-gu Seoul 135-710 Korea.

目的评估mR扩散加权成像在鉴别小的(<3cm)实性胰腺肿瘤与胰腺内副脾(IPAs)的应用价值。材料与方法本回顾性研究均经过机构伦理委员会的批准,免除了知情同意书。共有20例IPAs病人和22例胰腺内有小实性肿瘤的病人纳入本研究。所有病人均进... 详细信息

目的评估mR扩散加权成像在鉴别小的(m)实性胰腺肿瘤与胰腺内副脾(IPAs)的应用价值。材料与方法本回顾性研究均经过机构伦理委员会的批准,免除了知情同意书。共有20例IPAs病人和22例胰腺内有小实性肿瘤的病人纳入本研究。所有病人均进行mR扩散加权成像和钆塞酸增强扫描成像。2名观察者进行定量(信号强度)和定性(信号强度和AdC值)评估。使用Fisher确切概率法和mann-whitneyU检验对以上两组结果进行比较。结果与脾的信号强度比较,IPAs与小的胰腺实性肿瘤相比更多地表现为等信号,在t2加权像上为95%(19/20例)和41%(9/22例);增强扫描动脉期为100%(20/20例)和18%(4/22例),门静脉期为100%(20/20例)和23%(5/22例),延迟期为100%(20/20例)和41%(9/22例);扩散加权成像b=0s/mm2为95%(19/20例)和27%(2/22例),b=100s/mm2为95%(19/20)和27%(6/22例),b=800s/mm2为100%(20/20例)和27%(6/22例),以上两组的差异均有统计学意义(Ps相对信号强度与AdC比率的绝对平均值较低,趋近于0,明显低于胰腺肿瘤(Ps诊断的准确度、敏感度、特异度、阳性预测值、阴性预测值分别为95%(40/42例)、100%(20/20例)、91%(20/22例)、91%(20/22例)、100%(20/20例),观察者乙为90%(38/42例)、95%(19/20例)、86%(19/22例)、86%(19/22例)、95%(19/20例)。结论除了常规形态学上的mR成像,扩散加权成像可以作为鉴别胰腺内副脾与胰腺实性肿瘤的一种方法。原文载于Radiology,2013,266(1):159-167.

关键词：胰腺肿瘤副脾消化系肿瘤实性 IPAs 加权成像 mR cm

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