Details of the Researcher

PHOTO

Nobuhisa Fujita
Section
Institute of Multidisciplinary Research for Advanced Materials
Job title
Senior Assistant Professor
Degree

  • 博士（理学）（東北大学）

  • 修士（理学）（東北大学）

Research History 8

  • 2021/01 - Present
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials

  • 2007/04 - 2020/12
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials

  • 2015/10 - 2019/03
    Japan Science and Technology Agency

  • 2005/11 - 2007/03
    Tohoku University　Institute of Multidisciplinary Research for Advanced Materials

  • 2003/04 - 2005/10
    ストックホルム大学　アレニウス研究所 構造化学学科　博士研究員

  • 2001/10 - 2003/03
    Tohoku University　Research Institute of Electrical Communication

  • 2001/04 - 2001/10
    日露青年交流センター若手研究者派遣事業　派遣奨学生

  • 2000/05 - 2001/03
    科学技術振興事業団 戦略的基礎研究推進事業(CREST)　博士研究員

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Education 3

  • Tohoku University　Graduate School, Division of Natural Science　Department of Physics

    - 2000/03

  • Tohoku University　Graduate School, Division of Natural Science　Department of Physics

    - 1997/03

  • Tohoku University　Faculty of Science　Department of Physics

    - 1995/03

Committee Memberships 5

  • 一般社団法人 日本物理学会　代議員

    2023/04 - 2025/03

  • The 10th International Conference on Aperiodic Crystals (Aperiodic 2022)　Student Award Committee (chair)

    2022/06 - 2022/06

  • The 10th International Conference on Aperiodic Crystals (Aperiodic 2022)　Program Committee

    2021/10 - 2022/06

  • Tohoku University TFC Thematic Program 2019: Creating a New Frontier through the Synergy of Quasicrystals and Strongly Correlated Electron Systems　Co-Organizer

    2019/04 - 2020/03

  • 日本物理学会　領域６運営委員 (準結晶分野)

    2010/04 - 2011/03

Professional Memberships 1

  • The Physical Society of Japan

Research Interests 3

  • quasicrystals

  • electronic states

  • Electronic properties

Research Areas 2

  • Nanotechnology/Materials / Inorganic materials /

  • Natural sciences / Mathematical physics and basic theory /

Awards 2

  1. The Japan Institute of Metals and Materials The Best Paper Award

    2022/09　A Unified Geometrical Framework for Face-Centered Icosahedral Approximants in Al-Pd-TM (TM = Transition Metal) Systems (Materials Transactions, vol. 62 no. 3)

  2. 素材工学研究奨励賞

    2010/12　(財）素材工学研究会　準結晶の構造と物性の数理に関する研究

Papers 57

  1. Highly tuneable icosahedral orders in complex Al-Pd-W-Fe alloys Peer-reviewed

    Makito Aoyama, Satoshi Ohhashi, Hiroyuki Takakura, Yutaka Iwasaki, Nobuhisa Fujita

    Journal of Alloys and Compounds　1016　178838　2025/02

    DOI： 10.1016/j.jallcom.2025.178838 　

  2. Canonical‐Cell Tilings and their Atomic Decorations Peer-reviewed

    Nobuhisa Fujita, Marek Mihalkovič, Christopher L. Henley

    Israel Journal of Chemistry　2024/11

    DOI： 10.1002/ijch.202300130 　

  3. Formation and structure of 1/1 cubic approximants in the Cd-Mg-Ce system: The identification of a new structural variant Peer-reviewed

    Farid Labib, Nobuhisa Fujita, Hiroyuki Takakura, Satoshi Ohhashi, Takayuki Shiino, An-Pang Tsai, Ryuji Tamura

    Journal of Alloys and Compounds　954　170151-170151　2023/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jallcom.2023.170151 　

    ISSN： 0925-8388

  4. One-step synthesis of non-equilibrium Pd-Ru alloys from Al-Pd-Ru quasicrystals and approximants Peer-reviewed

    Takeru Fukushima, Ryota Tsukuda, Satoshi Ohhashi, Nobuhisa Fujita, Satoshi Kameoka

    Journal of Physics: Conference Series　2461　(1)　012001-012001　2023/03/23

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/2461/1/012001 　

    ISSN： 1742-6588

    eISSN： 1742-6596

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    Abstract Non-equilibrium Pd–Ru alloys were synthesized by leaching quasicrystal (icosahedral quasicrystal, IQC: Al71Pd19Ru10) and approximants (3/2 approximant, P40: Al72Pd16.4Ru11.6, 1/1 approximant, C1: Al70.4Pd14.7Ru14.9) of Al–Pd–Ru alloys with 20 wt% NaOH aqueous solution. The Pd-Ru alloys were investigated using XRD and HAADF-STEM, which showed that Pd and Ru were mixed and formed a non-equilibrium state (atomic ratio: 0.9 < Pd/Ru < 2). The Pd–Ru alloy obtained by leaching of P40 phase was found to exhibit high catalytic performance toward CO oxidation than Pd and Ru catalysts obtained by leaching of Al3Pd (decagonal quasicrystal) and Al13Ru4 (decagonal approximant), respectively (i.e., the alloying effect). Consequently, Al-Pd-Ru quasicrystals and approximant alloys are found to be useful precursors to obtain the non-equilibrium Pd-Ru alloys.

  5. Dualized Ammann-Kramer-Neri tiling Peer-reviewed

    Nobuhisa Fujita

    Journal of Physics: Conference Series　2461　(1)　012007-012007　2023/03/23

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/2461/1/012007 　

    ISSN： 1742-6588

    eISSN： 1742-6596

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    Abstract Self-similarity is a key characteristic of quasicrystalline tilings. The similarity ratio can be an n-th power of the irrational scaling unit associated with the relevant non-crystallographic Bravais class, where n is a natural number (e.g., 1, 2, …). The Ammann-Kramer-Neri tiling is a famous quasicrystalline tiling with icosahedral symmetry based on acute and obtuse rhombohedra. It has however remained underexplored in view of its self-similarity, since any attempt to find substitution rules has by far been hindered by the large similarity ratio of no less than τ3, where τ is the golden mean. We hereby illustrate a new approach to tackle this issue by introducing an auxiliary tiling that combines the rhombohedral tiling and its crystallographic dual supported on the body-centre positions. The vertices of this “dualized” tiling arise from the cut through the same kind of acceptance domain as that of the rhombohedral tiling, namely rhombic triacontahedron, attached to every point of the six-dimensional body-centred icosahedral Bravais lattice. Eleven kinds of polyhedra, nine out of which are tetrahedra, are identified as prototiles. This new tiling admits self-similarity with τ being the similarity ratio.

  6. Thermal Stability and CO Oxidation Property of Non-Equilibrium Pd–Ru Alloy Catalyst

    Takeru Fukushima, Ryota Tsukuda, Satoshi Ohhashi, Nobuhisa Fujita, Satoshi Kameoka

    MATERIALS TRANSACTIONS　64　(10)　2440-2444　2023

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.mt-mh2022010 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  7. カノニカルセルタイリング ―正２０面体ハイパーマテリアルへの幾何学的アプローチ― Invited Peer-reviewed

    藤田伸尚

    固体物理　56　(11)　5-22　2021/11/15

  8. 2/1 and 1/1 cubic approximants in the ternary R-Cd-Mg (R = Y, Er) systems Peer-reviewed

    Tsunetomo Yamada, Nobuhisa Fujita, Farid Labib

    Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials　77　(4)　638-648　2021/08/01

    Publisher: International Union of Crystallography ({IUCr})

    DOI： 10.1107/S2052520621006715 　

    eISSN： 2052-5206

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    The atomic structures of three cubic approximants (cAPs), Y12.7Cd61.8Mg25.5 [2/1 cAP with space group <italic>Pa</italic> <overline>3</overline>, <italic>a</italic> = 25.0654 (1) Å] and Er12.5Cd72.0Mg15.5 [2/1 cAP with <italic>Pa</italic> <overline>3</overline>, <italic>a</italic> = 24.9658 (1) Å], and Y14.5Cd66.1Mg19.4 [1/1 cAP with <italic>Im</italic> <overline>3</overline>, <italic>a</italic> = 15.4577 (1) Å], were investigated using X-ray structure analysis. The two 2/1  cAPs were found to be isostructural to the binary 2/1 cAP, YbCd5.8, which is composed of two building units, namely Tsai-type rhombic triacontahedron (RTH) cluster and double-Friauf polyhedron (DFP). The 1/1 cAP, in contrast, was found to be isostructural to the binary 1/1 cAP, YbCd6, which is composed solely of the RTH cluster. The refined structure models of the three cAPs exhibit substitutional disorders due to the Mg content that enters into Cd sites of the parent binary cAPs. In addition, in the 2/1 cAPs, the Y3(Er3) site on the third icosahedron shell of the RTH cluster and two positions inside DFP, Y5(Er5) sites, are partially mixed with Mg. Moreover, characteristic positional disorders owing to orientational disorder in the first shell of the RTH cluster is observed in all the three cAPs. A close relationship between the occupational disorder of the Y3(Er3) and Y5(Er5) sites in 2/1 cAPs and the elemental distribution in their first coordination shells is revealed.

  9. Bulk electronic structure of high-order quaternary approximants Peer-reviewed

    Shuvam Sarkar, Pampa Sadhukhan, Vipin Kumar Singh, Andrei Gloskovskii, Kazuhiko Deguchi, Nobuhisa Fujita, Sudipta Roy Barman

    Physical Review Research　2021/02/16

    DOI： 10.1103/PhysRevResearch.3.013151 　

  10. High catalytic performance of Al–Pd–(Ru, Fe) icosahedral approximants for acetylene semi-hydrogenation Peer-reviewed

    Keishi Abe, Ryota Tsukuda, Nobuhisa Fujita, Satoshi Kameoka

    RSC Advances　11　(25)　15296-15300　2021

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/D1RA01958A 　

    eISSN： 2046-2069

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    <p>The Al–Pd–(Ru, Fe) icosahedral approximants exhibited high catalytic ethylene selectivity and stability for semi-hydrogenation of acetylene.</p>

  11. Structural-transition-driven antiferromagnetic to spin-glass transition in Cd-Mg-Tb 1/1 approximants Peer-reviewed

    Farid Labib, Daisuke Okuyama, Nobuhisa Fujita, Tsunetomo Yamada, Satoshi Ohhashi, Daisuke Morikawa, Kenji Tsuda, Taku J. Sato, An Pang Tsai

    Journal of Physics Condensed Matter　32　(48)　2020/11/18

    DOI： 10.1088/1361-648X/aba921 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  12. Magnetic properties of icosahedral quasicrystals and their cubic approximants in the Cd-Mg-RE (RE = Gd, Tb, Dy, Ho, Er, and Tm) systems Peer-reviewed

    Farid Labib, Daisuke Okuyama, Nobuhisa Fujita, Tsunetomo Yamada, Satoshi Ohhashi, Taku J. Sato, An Pang Tsai

    Journal of Physics Condensed Matter　32　(41)　415801-415801　2020/09/30

    Publisher: IOP Publishing

    DOI： 10.1088/1361-648X/ab9343 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  13. Dodecagonal Quasicrystals in Mesoporous Silica: A New Route from Hard- To Soft-Sphere Packings Peer-reviewed

    Yangyang Wang, Quanzheng Deng, Nobuhisa Fujita, Lu Han

    Chemistry of Materials　32　(12)　5236-5245　2020/06/23

    DOI： 10.1021/acs.chemmater.0c01382 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  14. Icosahedral quasicrystals and their cubic approximants in the Cd-Mg-RE (RE = Y, Sm, Gd, Tb, Dy, Ho, Er, Tm) systems Peer-reviewed

    Nobuhisa Fujita

    Journal of Alloys and Compounds　822　153541-153541　2020/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.jallcom.2019.153541 　

    ISSN： 0925-8388

  15. Crystal twinning of bicontinuous cubic structures Peer-reviewed

    Lu Han, Nobuhisa Fujita, Hao Chen, Chenyu Jin, Osamu Terasaki, Shunai Che

    IUCrJ　7　(2)　228-237　2020/03/01

    Publisher: International Union of Crystallography ({IUCr})

    DOI： 10.1107/S2052252519017287 　

    ISSN： 2052-2525

    eISSN： 2052-2525

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    Bicontinuous cubic structures in soft matter consist of two intertwining labyrinths separated by a partitioning layer. Combining experiments, numerical modelling and techniques in differential geometry, we investigate twinning defects in bicontinuous cubic structures. We first demonstrate that a twin boundary is most likely to occur at a plane that cuts the partitioning layer almost perpendicularly, so that the perturbation caused by twinning remains minimal. This principle can be used as a criterion to identify potential twin boundaries, as demonstrated through detailed investigations of mesoporous silica crystals characterized by diamond and gyroid surfaces. We then discuss that a twin boundary can result from a stacking fault in the arrangement of inter-lamellar attachments at an early stage of structure formation. It is further shown that enhanced curvature fluctuations near the twin boundary would cost energy because of geometrical frustration, which would be eased by a crystal distortion that is experimentally observed.

  16. A Unified Geometrical Framework for Face-Centered Icosahedral Approximants in Al–Pd–TM (TM = Transition Metal) Systems Peer-reviewed

    Nobuhisa Fujita, Makoto Ogashiwa

    MATERIALS TRANSACTIONS　2020

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.mt-mb2020007 　

    ISSN： 1345-9678 1347-5320

  17. Atomic structure of the primitive cubic phase P-40 in the Al-Pd-Ru system Peer-reviewed

    Y. Hatakeyama, N. Fujita, A. P. Tsai

    13TH INTERNATIONAL CONFERENCE ON QUASICRYSTALS (ICQ13)　809　(1)　012007　2017

    DOI： 10.1088/1742-6596/809/1/012007 　

    ISSN： 1742-6588

  18. Quasiperiodic canonical-cell tiling with pseudo icosahedral symmetry Peer-reviewed

    Fujita, N.

    Annals of Physics　385　225-286　2017

    DOI： 10.1016/j.aop.2017.07.021 　

  19. Merohedral twinning in the Al-Pd-Ru 3/2 cubic approximant

    Fujita Nobuhisa, Hatakeyama Yusuke, Nishimoto Kazue

    Meeting Abstracts of the Physical Society of Japan　71　1460-1460　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1460 　

  20. Application of electron backscatter diffraction (EBSD) to quasicrystal-containing microstructures in the Mg-Cd-Yb system Peer-reviewed

    Tanaka, R., Ohhashi, S., Fujita, N., Demura, M., Yamamoto, A., Kato, A., Tsai, A.P.

    Acta Materialia　119　193-202　2016

    DOI： 10.1016/j.actamat.2016.08.011 　

  21. 22aCS-3 Possible existence of canonical cell tilings with icosahedral symmetry

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　70　1666-1666　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1666 　

    ISSN： 2189-079X

  22. Structure analysis of a hyper-complex approximant to icosahedral quasicrystal using 3D electron diffraction tomography Peer-reviewed

    Peter Oleynikov, Yanhang Ma, Nobuhisa Fujita, Javier Garcia-Garcia, Kyung Byung Yoon, An Pang Tsai, Osamu Terasaki

    Microscopy and Microanalysis　20　(3)　596-597　2014/08/01

    DOI： 10.1017/S143192761400470X 　

    ISSN： 1431-9276

    eISSN： 1435-8115

  23. 準結晶と高次元結晶学

    藤田伸尚

    金属（アグネ技術センター）　84　(4)　44-52　2014/04

  24. 準結晶と高次元結晶学 (特集 世界結晶年を記念して)

    藤田 伸尚

    金属　84　(4)　332-340　2014/04

    Publisher: アグネ技術センター

    ISSN： 0368-6337

  25. Structures of silica-based nanoporous materials revealed by microscopy Peer-reviewed

    Han, L., Ohsuna, T., Liu, Z., Alfredsson, V., Kjellman, T., Asahina, S., Suga, M., Ma, Y., Oleynikov, P., Miyasaka, K., Mayoral, A., Díaz, I., Sakamoto, Y., Stevens, S.M., Anderson, M.W., Xiao, C., Fujita, N., Garcia-Bennett, A., Yoon, K.B., Che, S., Terasaki, O.

    Zeitschrift fur Anorganische und Allgemeine Chemie　640　(3-4)　521-536　2014

    DOI： 10.1002/zaac.201300538 　

  26. A review of fine structures of nanoporous materials as evidenced by microscopic methods Peer-reviewed

    Liu, Z., Fujita, N., Miyasaka, K., Han, L., Stevens, S.M., Suga, M., Asahina, S., Slater, B., Xiao, C., Sakamoto, Y., Anderson, M.W., Ryoo, R., Terasaki, O.

    Journal of Electron Microscopy　62　(1)　109-146　2013

    DOI： 10.1093/jmicro/dfs098 　

  27. Cluster-packing geometry for Al-based F-type icosahedral alloys Peer-reviewed

    Fujita, N., Takano, H., Yamamoto, A., Tsai, A.-P.

    Acta Crystallographica Section A: Foundations of Crystallography　69　(3)　322-340　2013

    DOI： 10.1107/S0108767313005035 　

  28. The role of curvature in silica mesoporous crystals Peer-reviewed

    Miyasaka, K., Bennett, A.G., Han, L., Han, Y., Xiao, C., Fujita, N., Castle, T., Sakamoto, Y., Che, S., Terasaki, O.

    Interface Focus　2　(5)　634-644　2012

    DOI： 10.1098/rsfs.2011.0098 　

  29. Dodecagonal tiling in mesoporous silica Peer-reviewed

    Xiao, C., Fujita, N., Miyasaka, K., Sakamoto, Y., Terasaki, O.

    Nature　487　(7407)　349-353　2012

    DOI： 10.1038/nature11230 　

  30. Research on quasicrystal and alloy catalysts

    蔡 安邦, 亀岡 聡, 藤田 伸尚

    Materials integration　24　(4)　43-48　2011/04

    Publisher: ティー・アイ・シィー

    ISSN： 1344-7858

  31. 点集合置換法による正二十面体対称準周期タイリングの作成 (準周期秩序の数理)

    藤田 伸尚

    数理解析研究所講究録　1725　1-14　2011/02

    Publisher: 京都大学

    ISSN： 1880-2818

  32. 非周期タイル張りの結晶学

    藤田 伸尚

    日本結晶学会誌　53　s12　2011

    Publisher: The Crystallographic Society of Japan

    DOI： 10.5940/jcrsj.53.s12 　

    ISSN： 0369-4585

  33. Laves phases in RE(Mg,Cd)<inf>2</inf> (RE = rare earth) pseudo-binary alloys Peer-reviewed

    Fujita, N., Kikuchi, S.-I., Tsai, A.-P.

    Solid State Sciences　13　(4)　698-698　2011

    DOI： 10.1016/j.solidstatesciences.2010.08.013 　

  34. Shape- and size-controlled synthesis in hard templates: Sophisticated chemical reduction for mesoporous monocrystalline platinum nanoparticles Peer-reviewed

    Wang, H., Jeong, H.Y., Imura, M., Wang, L., Radhakrishnan, L., Fujita, N., Castle, T., Terasaki, O., Yamauchi, Y.

    Journal of the American Chemical Society　133　(37)　14526-14529　2011

    DOI： 10.1021/ja2058617 　

  35. A family of ternary decagonal tilings Peer-reviewed

    Nobuhisa Fujita

    6TH INTERNATIONAL CONFERENCE ON APERIODIC CRYSTALS (APERIODIC'09)　226　(1)　012021　2010

    DOI： 10.1088/1742-6596/226/1/012021 　

    ISSN： 1742-6588

  36. Point processes for decagonal quasiperiodic tilings

    Nobuhisa Fujita

    Acta Cryst. A 65 (2009) 342-351　2009/05/31

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    A general construction principle of inflation rules for decagonal<br /> quasiperiodic tilings is proposed. The prototiles are confined to be polygons<br /> with unit edges. An inflation rule for a tiling is the combination of an<br /> expansion and a division of the tiles, where the expanded tiles can be divided<br /> arbitrarily as far as the set of prototiles is maintained. A certain kind of<br /> point decoration processes turns out to be useful for the identification of<br /> possible division rules. The method is capable of generating a broad range of<br /> decagonal tilings, many of which are chiral and have atomic surfaces with<br /> fractal boundaries. Two new families of decagonal tilings are presented; one is<br /> quarternary and the other ternary. Properties of the ternary tilings with<br /> rhombic, pentagonal, and hexagonal prototiles are investigated in detail.

  37. Point substitution processes for decagonal quasiperiodic tilings Peer-reviewed

    Fujita, N.

    Acta Crystallographica Section A: Foundations of Crystallography　65　(5)　342-351　2009

    DOI： 10.1107/S0108767309025008 　

  38. Coordination and cluster packing in quasicrystals Peer-reviewed

    Fujita, N., Niizeki, K.

    Philosophical Magazine　88　(13-15)　1913-1919　2008

    DOI： 10.1080/14786430802068510 　

  39. Super-coloured tilings: A novel class of two-dimensional limit-periodic structures Peer-reviewed

    Niizeki, K., Fujita, N.

    Philosophical Magazine　87　(18-21)　3073-3078　2007

    DOI： 10.1080/14786430701358681 　

  40. Electron Microscopy Studies of Structural Modulation in Micro- and Meso-Porous Crystals

    Osamu Terasaki, Tetsu Ohsuna, Zheng Liu, Yasuhiro Sakamoto, Keiichi Miyasaka, Nobuhisa Fujita, Nozomu Togashi, Shunai Che

    Turning Points in Solid-State, Materials and Surface Science - A Book in Celebration of the Life and Work of Sir John Meurig Thomas　667-686　2007

  41. Superquasicrystals with 8-, 10- and 12-fold point symmetries Peer-reviewed

    Fujita, N., Niizeki, K.

    Philosophical Magazine　86　(3-5)　587-592　2006

    DOI： 10.1080/14786430500253950 　

  42. Band structure of the P, D, and G surfaces Peer-reviewed

    N Fujita, O Terasaki

    PHYSICAL REVIEW B　72　(8)　085459　2005/08

    DOI： 10.1103/PhysRevB.72.085459 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  43. Band structure of the P-, D-, and G-surfaces Peer-reviewed

    Nobuhisa Fujita, Osamu Terasaki

    Physical Review B　72　85459　2005/04

  44. Superquasicrystals: Self-similar-ordered structures with non-crystallographic point symmetries Peer-reviewed

    Niizeki, K., Fujita, N.

    Journal of Physics A: Mathematical and General　38　(13)　L199-L204　2005

    DOI： 10.1088/0305-4470/38/13/L01 　

  45. Band structure of the P, D, and G surfaces Peer-reviewed

    Fujita, N., Terasaki, O.

    Physical Review B - Condensed Matter and Materials Physics　72　(8)　2005

    DOI： 10.1103/PhysRevB.72.085459 　

  46. A self-similar ordered structure with a non-crystallographic point symmetry

    Komajiro Niizeki, Nobuhisa Fujita

    2004/08/12

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    A new class of self-similar ordered structures with non-crystallographic<br /> point symmetries is presented. Each of these structures, named<br /> superquasicrystals, is given as a section of a higher-dimensional &quot;crystal&quot;<br /> with recursive superlattice structures. Such structures turn out to be<br /> limit-quasiperiodic, distinguishing themselves from quasicrystals which are<br /> quasiperiodic. There exist a few real materials that seem to be promising<br /> candidates for superquasicrystals.

  47. Universalities in one-electron properties of limit quasiperiodic lattices Peer-reviewed

    Endou, R., Niizeki, K., Fujita, N.

    Journal of Physics A: Mathematical and General　37　(13)　L151-L156　2004

    DOI： 10.1088/0305-4470/37/13/L01 　

  48. Quantum particles constrained on cylindrical surfaces with non-constant diameter Peer-reviewed

    Fujita, N.

    Journal of the Physical Society of Japan　73　(11)　3115-3120　2004

    DOI： 10.1143/JPSJ.73.3115 　

  49. Classification of One-Dimensional Quasilattices into Mutual Local-Derivability Classes Peer-reviewed

    Niizeki, K., Fujita, N.

    Journal of the Physical Society of Japan　71　(1)　99-118　2002

    DOI： 10.1143/JPSJ.71.99 　

  50. Incommensurate modulation in the microporous silica SSZ-24 Peer-reviewed

    Liu, Z., Fujita, N., Terasaki, O., Ohsuna, T., Hiraga, K., Camblor, M.A., Díaz-Cabañas, M.-J., Cheetham, A.K.

    Chemistry - A European Journal　8　(19)　4549-4556　2002

    DOI： 10.1002/1521-3765(20021004)8:19<4549::AID-CHEM4549>3.0.CO;2-Z 　

  51. Electronic properties of ternary quasicrystals in one dimension Peer-reviewed

    Nobuhisa Fujita, Komajiro Niizeki

    Phys. Rev. B　64　144207　2001/09/24

  52. Electronic properties of ternary quasicrystals in one dimension Peer-reviewed

    Nobuhisa Fujita, Komajiro Niizeki

    Physical Review B　64　144207　2001/04

  53. Electronic properties of ternary quasicrystals in one dimension

    Nobuhisa Fujita, Komajiro Niizeki1

    Physical Review B - Condensed Matter and Materials Physics　64　(14)　2001

    DOI： 10.1103/PhysRevB.64.144207 　

    ISSN： 1550-235X 1098-0121

  54. Electronic properties of ternary quasicrystals in one dimension Peer-reviewed

    Fujita, N., Niizeki, K.

    Physical Review B - Condensed Matter and Materials Physics　64　(14)　1442071-1442078　2001

  55. Localization properties of electronic wave functions of the Hubbard model on the Fibonacci lattice Peer-reviewed

    Fujita, N., Niizeki, K.

    Materials Science and Engineering A　294-296　560-563　2000

    DOI： 10.1016/S0921-5093(00)01164-3 　

  56. New classes of quasicrystals and marginal critical states Peer-reviewed

    Fujita, N., Niizeki, K.

    Physical Review Letters　85　(23)　4924-4927　2000

    DOI： 10.1103/PhysRevLett.85.4924 　

  57. Electronic Properties of a Generalized Fibonacci Model Peer-reviewed

    Nobuhisa Fujita, Komajiro Niizeki

    Proceedings of the 6th International Conference on Quasicrystals (World Scientific)　172　1997/05

Show all ︎Show first 5

Misc. 32

  1. A structural reinvestigation of α-AlCuRu as merohedric twins

    Nobuhisa Fujita, Tianyu Li, Kazue Nishimoto, An-Pang Tsai

    Aperiodic 2018 ("9th Conference on Aperiodic Crystals")　2018

    Publisher: Iowa State University, Digital Press

    DOI： 10.31274/aperiodic2018-180810-38 　

  2. 8aBE-1 Local degrees of freedom of cluster arrangement in high-order approximants to icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　69　(2)　563-563　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  3. 29pCB-5 Structure classification of complex ordered materials

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　69　(1)　807-807　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  4. Construction of canonical cell tilings with long periods by the use of point substitution processes II

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　68　(2)　707-707　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  5. 29aEP-11 Electronic structures and charge transfer estimation of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S., Terauchi M., Fujita N., Tsai A. P.

    Meeting abstracts of the Physical Society of Japan　68　(1)　892-892　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  6. 29aEP-5 Construction of canonical cell tilings with long periods by the use of point substitution processes

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　68　(1)　890-890　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  7. 20pCA-4 Electron structures study of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S., Terauchi M., Fujita N., Tsai A. P.

    Meeting abstracts of the Physical Society of Japan　67　(2)　744-744　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  8. 20aCA-1 The configuration order of clusters in an Al-Pd-Cr-Fe approximant

    Fujita Nobuhisa, Yamamoto Akiji, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　67　(2)　738-738　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  9. 27aGF-5 Structural modeling of Al-based F-type icosahedral phases and their approximants

    Fujita Nobuhisa, Takano Hikaru, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　67　(1)　857-857　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  10. 22pGD-8 Phase equilibrium between quasicrystal and Mg in the Mg-Cd-Yb system

    Tsai An Pang, Ohhashi Satoshi, Fujita Nobuhisa, Kato Akira

    Meeting abstracts of the Physical Society of Japan　66　(2)　810-810　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  11. 22pGD-1 Random things with a Linear phason stain

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　66　(2)　809-809　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  12. 21aRC-4 A simulation study on the growth of silica mesoporous crystals with 12-fold symmetry

    Fujita Nobuhisa, Xiao Changhong, Terasaki Osamu

    Meeting abstracts of the Physical Society of Japan　66　(2)　899-899　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  13. 27pEG-5 Phason fluctuations in the Boron-based decagonal quasicrystal

    Fujita N., Takano H., Tsai A. P.

    Meeting abstracts of the Physical Society of Japan　66　(1)　834-834　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  14. 24pXL-3 Structural modeling of icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　65　(2)　752-752　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  15. 20pHX-2 Geometry of quasiperiodic tilings and quasicrystal structure

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　65　(1)　815-815　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  16. 25aYB-4 On the structural stability of Laves phases in quasibinary alloys (Cd,Mg)_2RE

    Fujita Nobuhisa, Kikuchi Shinichi, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　64　(2)　690-690　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  17. 28pYK-9 New decagonal tilings with fractal windows and phason fluctuations

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　64　(1)　789-789　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  18. 20pYJ-2 Dense packing with icosahedral clusters

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　63　(2)　694-694　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  19. 24aWA-2 Icosahedral quasilattices generated by the point inflation rule

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　63　(1)　765-765　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  20. 23pXQ-7 An analysis of local coordination in quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　62　(2)　832-832　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  21. 19pRF-12 Ab initio study on the effects of chemical substitution for the stability of Cd-RE compounds

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　62　(1)　784-784　2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  22. 23pYP-7 Ab initio calculations for Cd_2RE Laves phases and the structural stability of quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　61　(2)　635-635　2006/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  23. 14pTK-3 Electronic properties of curved surfaces : effects of curvature, symmetry, and topology

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　59　(2)　272-272　2004/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  24. An Intrusion Detection Strategy Based on Data Aggregation and Shannon Entropy

    FUJITA Nobuhisa, SHIRATORI Norio

    IPSJ SIG Notes　2003　(18)　133-138　2003/02/27

    Publisher: Information Processing Society of Japan (IPSJ)

    ISSN： 0919-6072

    More details Close

    We have devised a general algorithm for classifying audit data into clusters associated with different types of network activities, in view of developing a more robust way of profiling network entities for intrusion detection. The method is based on the aggregation of the network hosts. The capability of the algorithm is examined by analyzing some log data of SNORT. A probable advantage of our algorithm lies in its ability to discern distributed attacks more effectively than any of the existing algorithms.

  25. A Destination Oriented Distributed Routing Method for Dynamic Multipoint Connection

    CHAYABEJARA A., CHAKRABORTY D., ZABIR S. M. S., KHAN A., FUJITA N., SHIRATORI N.

    IEICE technical report. Communication systems　102　(353)　1-6　2002/10/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Single point, sender based control does not adapt or scale well for multicast delivery. For applications, such as group video or teleconferencing a low total cost multicast tree is required. In this article we present a destination driven algorithm to minimize the total tree cost of multicast tree in a dynamic situation for the whole session duration. In this heuristic approach we considered the staying duration of participants are available at the time of joining. The performance of our algorithm is analyzed through extensive simulation and evaluated against several other existing dynamic multicast routing and also against one well known near optimum heuristic algorithm used for solving Steiner tree problem. We have further tested our algorithm using erroneous information given by the joining participants. Simulation results shows that it performs equally well even when the range of error is considerably high, which proves the robustness of our algorithm.

  26. Network Monitoring at the JGN Tohoku University office

    KOIDE Kazuhide, CHAKRABORTY Debasish, FUJITA Nobuhisa, SAITO Takeo, MANSFIELD Glenn, SHIRATORI Norio

    IEICE technical report. Communication systems　102　(353)　41-44　2002/10/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    In this report, we present recent research effort and progress on network monitoring at the JGN (Japan Gigabit Network) Tohoku University office. In order to achieve a scalable collection of operational information within a large-scale computer network, distributed network monitoring system would be inevitable. We describe the present status of research on two key technologies, distributed collection techniques of operational information, and the integration techniques of the collected information. We also present the network information visualization system, JaNI, which has been developed at the JGN office and dedicated to provide information regarding the network even to the users.

  27. Growth kinetics on quasicrystalline surfaces

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　57　(2)　656-656　2002/08/13

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  28. EIectronic structures of the period-doubling lattice and other aperiodic lattices with non-invertible substitution rules

    Endou Rihei, Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　57　(2)　284-284　2002/08/13

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  29. Pseudo-localized one-electron states in one-dimensional quasiperiodic or aperiodic chains

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　55　(1)　685-685　2000/03/10

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  30. Electron-electron interaction may break the universality class of the Fibonacci lattice

    FUJITA Nobuhisa, NIIZEKI Komajirou

    Meeting abstracts of the Physical Society of Japan　53　(2)　590-590　1998/09/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  31. 29a-R-4 Electronic Properties of a Generalized Fibonacci Model

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　52　(1)　601-601　1997/03/17

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  32. 1a-E-9 Electronic Eigenstates on a generalized-Fibonacci-Lattice

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　389-389　1996/03/15

    Publisher: The Physical Society of Japan (JPS)

Show all ︎Show first 5

Presentations 152

  1. Thermoelectric properties of icosahedral quasicrystals and 3/2 periodic approximants in the Al-Pd-TM-Fe (TM=Mo, W) systems

    M. Aoyama, H. Takakura, Y. Iwasaki, K. Deguchi, N. Fujita

    The 16th International Conference on Quasicrystals　2025/06/25

  2. Pd-doped Al13Fe4 as an efficient catalyst for the semi-hydrogenation reaction of acetylene

    M. Hanaoka, E. Gaudry, K. Nozawa, N. Fujita#, S. Kameoka

    The 16th International Conference on Quasicrystals　2025/06/23

  3. Vertex environments in the extended canonical cell tiling

    N. Fujjita

    The 16th International Conference on Quasicrystals　2025/06/23

  4. A novel variant of rhombic Penrose tiling

    N. Fujita, K. Niizeki

    The 16th International Conference on Quasicrystals　2025/06/24

  5. Synthesis and structural analysis of new intermetallic compounds in Al-Pd-W alloys

    Makito Aoyama, Nobuhisa Fujita, Hiroyuki Takakura

    2025 Spring Meeting, The Physical Society of Japan　2025/03/19

  6. The crystal structure and electronic structure of novel intermetallic compounds in the Al-Pd-W system

    Nobuhisa Fujita, Makito Aoyama, Hiroyuki Takakura

    2025 Spring Meeting, The Physical Society of Japan　2025/03/19

  7. Catalytic Activities of Al13TM4 (TM=Fe, Co) Complex Intermetallic Compounds

    Mai Hanaoka, Emilie Gaudry, Kazuki Nozawa, Nobuhisa Fujita, Satoshi Kameoka

    2025/01/21

  8. A search for formation conditions of quasicrystals and their approximants in Al-Pd-Mo-Fe alloys

    Kanon Amai, Satoshi Ohhashi, Nobuhisa Fujita

    2025/01/20

  9. Structural analysis of 3/2 approximants in Al-Pd-(W,Fe) alloys and their thermoelectric properties

    Makito Aoyama, Nobuhisa Fujita, Hiroyuki Takakura, Yutaka Iwasaki, Satoshi Ohhashi

    2025/01/20

  10. A new rhombic Penrose tiling and its generalization

    Nobuhisa Fujita, Komajiro Niizeki

    2025/01/22

  11. カノニカルセルタイリングとその拡張による正２０面体準結晶関連化合物の精密構造モデリング Invited

    藤田伸尚

    ⽇本結晶学会 令和6年（2024年）度年会　2024/11/09

  12. Structural analysis of the 3/2 periodic approximants in Al-Pd-W-Fe alloys

    Makito Aoyama, Nobuhisa Fujita, Hiroyuki Takakura

    2024/09/17

  13. Enumeration of vertex environments in the extended canonical-cell tiling

    Nobuhisa Fujita

    2024/09/17

  14. Catalytic Activity of Alloys Using Al13Fe4 as a Platform

    Mai Hanaoka, Kazuki Nozawa, Nobuhisa Fujita, Satoshi Kameoka

    The 11th International Conference on Aperiodic Crystals　2024/06/26

  15. New icosahedral quasicrystal and higher-order approximants in Al-Pd-W-Fe alloys

    Makito Aoyama, Nobuhisa Fujita, Satoshi Ohhashi

    The 11th International Conference on Aperiodic Crystals　2024/06/25

  16. Extended canonical-cell tiling

    Nobuhisa Fujita

    The 11th International Conference on Aperiodic Crystals　2024/06/28

  17. Al-Pd-Fe系合金におけるW添加による新規準結晶及び高次近似結晶の創成

    青山茉喜乙, 藤田伸尚, 大橋諭

    日本物理学会2024年春季大会　2024/03/20

  18. Cluster-packing geometry based on an extended canonical-cell tiling

    Nobuhisa Fujita

    2024/03/20

  19. Al-Pd-Fe 系合金におけるＷ添加による新規準結晶及び高次 近似結晶の創成

    青山 茉喜乙, 藤田 伸尚, 大橋 諭

    日本金属学会2024年春期（第174回）講演大会　2024/03/14

  20. 触媒活性元素をドープした複雑金属間化合物 Al13Fe4 の触媒特性

    花岡 真衣, 野澤 和生, 藤田 伸尚, 亀岡 聡

    日本金属学会2024年春期（第174回）講演大会　2024/03/14

  21. Study of icosahedral hypermaterials in Al-Pd-TM (transition metal) systems

    Nobuhisa Fujita

    2024/03/05

  22. 一般化Ammannグリッドの双対としての菱型準周期タイリングと ハイパーユニフォーミティ Invited

    藤田伸尚

    第2回研究会「準周期電子状態とマルチフラクタリティ・ハイパーユニフォーミティ」　2024/01/16

  23. Single-crystal growth and structure analysis of the high-order approximant in Al-Pd-Mn-Fe systems

    Chisuwa Kansuke, Nobuhisa Fujita, Satoshi Ohashi

    第28回準結晶研究会　2023/12/18

  24. Creation of new quasicrystals and higher order approximants by addition of W in Al-Pd-Fe alloys

    Makito Aoyama, Nobuhisa Fujita, Satoshi Ohashi

    2023/12/18

  25. Creation of novel catalytic functions using Al13Fe4 as a platform

    Mai Hanaoka, Satoshi Kameoka, Nobuhisa Fujita

    2023/12/18

  26. Rhombic quasiperiodic tilings generated using generalized Ammann bar grids

    Nobuhisa Fujita, Komajiro Niizeki

    2023/12/20

  27. 2τ^2-scale inflation for canonical-cell tilings

    Nobuhisa Fujita

    International Conference on Complex Orders in Condensed Matter:aperiodic order, local order, electronic order, hidden order (Evian, France)　2023/09/27

  28. Geometrical modeling of icosahedral quasicrystals with super-lattice orderings

    Nobuhisa Fujita

    78th Annual Meeting, The Physical Society of Japan　2023/09/17

  29. Emergence of marginal critical states in non-Penrose type rhombic decagonal tilings

    Nobuhisa Fujita

    The 15th International Conference on Quasicrystals (ICQ15) [The Steinhardt Museum of Natural History, Tel Aviv University, Israel]　2023/06/19

  30. Crystal structure and phase formation behavior of a 1/0 cubic approximant in the Al-Pd-Fe system

    Keishi Abe, Nobuhisa Fujita, Hiroyuki Takakura

    The 15th International Conference on Quasicrystals (ICQ15) [The Steinhardt Museum of Natural History, Tel Aviv University, Israel]　2023/06/19

  31. On the possibility of a 𝟐𝝉^𝟐-scale inflation rule for canonical-cell tilings

    Nobuhisa Fujita

    2023/05/29

  32. カノニカルセル準結晶における正二十面体対称性の破れ

    藤田 伸尚

    第27回準結晶研究会　2023/03/01

  33. 非周期格子のハイパーユニフォーミティと電子状態の臨界性 Invited

    藤田伸尚

    研究会「準周期電子状態とマルチフラクタリティ・ハイパーユニフォーミティ」　2023/02/01

    More details Close

    クラスＩのハイパーユニフォーミティを持つ１次元準格子上のタイトバインディング模型では、ほぼ全てのエネルギー固有状態がマルチフラクタルな波動関数で表され局在と非局在の中間的な性質を持つ臨界状態となる。一方で、クラスＩＩの１次元準格子上では、階層的に生じるエネルギーギャップに隣接する全ての準位に対する固有状態が伸長指数関数的なスケーリングで特徴づけられる擬局在状態（マージナル臨界状態）となることが、実空間繰り込み群を用いた解析により明らかになっている。 このように、一次元準格子に限ると、ハイパーユニフォーミティと電子の局在性には一定の相関性が認められる。発表では、より一般的な視点から非周期格子のハイパーユニフォーミティと一電子状態の局在性の関係を考察する。

  34. Local structures and self-similarity of the dualized AKN tiling

    Nobuhisa Fujita

    2022/12/21

  35. A comparative study of electronic eigenstates in rhombic decagonal tilings with different long-range characteristics: The emergence of pseudo-localized states in non-Penrose type systems

    Nobuhisa Fujita

    GIMRT, REIMEI and IRN Aperiodic joint international workshop: Superconductivity, Structural Complexity and Topology of UTe2 and Aperiodic Crystals　2022/11/30

  36. A dualized Ammann-Kramer-Neri tiling

    Nobuhisa Fujita

    Mathematics of tilings and quasiperiodic systems　2022/11/08

  37. Structure of high-order icosahedral approximant crystals in Al-Pd-transition metal systems

    Nobuhisa Fujita, Yusuke Hatakeyama, Hiroyuki Takakura

    2022/09/22

  38. Electronic eigenstates on rhombic decagonal quasilattices with different long-range characteristics

    Nobuhisa Fujita

    JPS 2022 Autumn Meeting　2022/09/12

  39. Self-similarity of the doubled Ammann-Kramer-Neri tiling

    Nobuhisa Fujita

    The 10th International Conference on Aperiodic Crystals (Aperiodic 2022)　2022/06/21

  40. Al-Pd-TM（TM=遷移金属）系高次近似結晶に対する結晶構造解析の現状

    藤田伸尚

    新学術領域ハイパーマテリアル 第８回領域会議　2022/04/19

  41. MLD classification of planar quasilattices and electronic states II

    Nobuhisa Fujita

    2022/03/15

  42. Ammann-Kramer-Neriタイリングの自己相似性

    藤田伸尚

    第26回準結晶研究会（新学術領域「ハイパーマテリアル」第3回若手研究会）　2022/02/23

  43. Quasiperiodic Self-similar Patterns with Icosahedral Symmetry Invited

    Nobuhisa Fujita

    MRM2021 Materials Research Meeting (Pacifico Yokohama North)　2021/12/14

  44. Pseudo-merohedral twinning of 𝜶-(Al-Cu-Ru)

    Nobuhisa Fujita, Tianyu Li, Kazue Nishimoto, Yeong-Gi So, Tetsu Watanuki

    International Research Network: Open space between aperiodic order and physics & chemistry of materials (Carry le Rouet, France, hybrid)　2021/10/07

  45. MLD classification of planar quasilattices and electronic states

    Nobuhisa Fujita

    2021/09/21

  46. An I-type icosahedral quasilattice with self-similarity

    Nobuhisa Fujita

    2021/07/13

  47. A theoretical guide to quasiperiodic tilings Invited

    Nobuhisa Fujita

    1st International School on Hypermaterials (ISH2021)　2021/06/22

  48. Al-Pd-TM(TM：遷移金属系正二十面体準結晶および関連化合物の形成条件と電子構造

    藤田伸尚, 阿部圭史, 福島武

    日本物理学会 第 76 回 年次大会　2021/03/14

  49. Al-Pd-TM(TM=Ru, Fe)系準結晶、近似結晶の触媒材料への応用に関する研究

    附田良太, 阿部圭史, 福島武, 藤田伸尚, 亀岡聡

    第２５回準結晶研究会　2021/03/04

  50. Al-Pd-TM(TM：遷移金属)系正二十面体準結晶および関連化合物の形成条件と電子構造

    藤田伸尚, 阿部圭史, 福島武

    第２５回準結晶研究会　2021/03/05

  51. On the phase stability of icosahedral quasicrystals and high order approximants in aluminum transition metal alloys

    Nobuhisa Fujita, Keishi Abe, Takeru Fukushima

    2020/12/08

  52. Overview of our research group at IMRAM, Tohoku University, Japan: Metallurgical Design for Material Functions ― Exploration of novel alloy catalysts & aperiodic crystals ―

    Nobuhisa Fujita

    2020/09/23

  53. Al-Pd-(Ru, Fe)系近似結晶相の形成および構造

    阿部 圭史, 藤田 伸尚, 山根 久典

    日本金属学会2020年秋期講演大会　2020/09/16

  54. Al-Pd-Ru系正二十面体準結晶および近似結晶の相形成に対するCr置換の影響

    福島 武, 藤田 伸尚, 大橋 諭

    日本金属学会2020年秋期講演大会　2020/09/16

  55. Effects of Mg addition on magnetic behavior of Cd-Mg-RE (RE = Tb, Ce) 1/1 approximants

    Farid Labib, Takayuki Shiino, Daisuke Okuyama, Nobuhisa Fujita, Tsunetomo YamadaB, Daisuke Morikawa, Keiichiro ImuraA, Kazuhiko Deguchi, Kenji Tsuda, Taku Sato, Noriaki Sato, An-Pang Tsai

    2020/09/09

  56. Body-centered icosahedral quasilattices with simply connected windows

    Nobuhisa Fujita

    2020/09/09

  57. Mesoporous silica with 12 fold symmetry formed through the packing of spherical micelles

    Nobuhisa Fujita, Lu Han

    2020/07/15

  58. 準周期構造の理論的基礎 Invited

    藤田伸尚

    新学術領域ハイパーマテリ アル 第一回若手研究会　2020/05/28

  59. Effect of Cr substitution on the phase stability of icosahedral quasicrystal in the Al Pd Ru system

    T. Fukushima, N. Fujita, S. Ohhashi

    2020/02/20

  60. Magnetic properties of Icosahedral quasicrystals and their cubic approximants in Cd Mg RE (RE = Gd, Tb, Dy, Ho, Er, Tm) systems

    Farid Labib, Daisuke Okuyama, Nobuhisa Fujita, Tsunetomo Yamada, Satoshi Ohhashi, Taku J. Sato, An Pang Tsai

    2020/02/20

  61. Atomic nets and packings in hypermaterials

    Nobuhisa Fujita

    2020/02/20

  62. Canonical-cell geometry: a practical framework for describing the packing of icosahedral clusters International-presentation Invited

    FUJITA Nobuhisa

    Interdisciplinary Symposium for Quasicrystals and Strongly Correlated Electron Systems (QSC2019)　2019/06/24

  63. Canonical-cell geometry: a renewed perspective International-presentation Invited

    FUJITA Nobuhisa

    14th International Conference on Quasicrystals (ICQ14)　2019/05/26

  64. Al-Pd-(Fe,Ru)系近似結晶の同族置換による相形成要因の調査

    阿部 圭史, 大橋 諭, 藤田伸尚, 蔡 安邦

    日本金属学会2019年春期講演大会(東京電機大学)　2019/03/21

  65. 補空間次元を介した 物質系のトポロジカル制御

    藤田 伸尚

    日本化学会第 99 春季年会（2019）CREST & さきがけ「超空間制御」領域 公開シンポジウム・研究成果報告会　2019/03/18

  66. α‐AlCuRuにおけるmerohedric双晶境界

    藤田伸尚, 藤田伸尚

    日本物理学会講演概要集(CD-ROM)　2018/09/21

  67. Al‐Cu‐Mn系におけるdecagonal相近似結晶相の形成条件の探索

    高橋宏毅, 藤田伸尚, 大橋諭, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2018/09/05

  68. Al‐Cu‐Ru系1/1近似結晶(α相)の構造についての再考

    LI Tianyu, 藤田伸尚, 西本一恵, TSAI An‐Pang

    日本物理学会講演概要集(CD-ROM)　2018/03/23

  69. Al‐Cu‐Co‐Cr系における正20面体相近似結晶相の形成条件の探索

    高橋宏毅, 藤田伸尚, 蔡安邦, 大橋諭

    日本金属学会講演概要(CD-ROM)　2018/03/05

  70. Al‐Pd‐Mo‐Fe系正二十面体相近似結晶における超格子秩序と相転移

    藤田伸尚

    日本物理学会講演概要集(CD-ROM)　2017/09/25

  71. Single-crystal synthesis and structure analysis of the 1/1-rational approximant in the Al-Cu-Ru system

    Li Tianyu, Fujita Nobuhisa, Nishimoto Kazue, Tsai An-Pang

    Meeting Abstracts of the Physical Society of Japan　2017/08/23

    More details Close

    <p>Al-Cu-Ru系1/1近似結晶における結晶構造は杉山らによって報告されている[1]。しかし、その報告ではいくつかのサイトにおける原子の占有率が低く、結晶構造に誤りがある可能性が考えられる。本研究ではAl-Cu-Ru系1/1近似結晶の構造解析を改めて行うため、良質な単結晶の作製を試みた。得られた試料を解析した結果、近似結晶作製の際に発生し得る特徴的な面欠陥の存在を見出した。[1]K. Sugiyama, T. Kato, T. Ogawa, K. Hiraga, K. Saito, J. Alloy Com. 299 (2000) 169-174.</p>

  72. Al‐Cu‐Ru系1/1近似結晶の単結晶作製と構造評価

    LI Tianyu, 藤田伸尚, 西本一恵, TSAI An‐Pang

    日本物理学会講演概要集(CD-ROM)　2017/03/21

  73. Al‐Pd‐Ru系正二十面体準結晶に対する単結晶育成条件の探索

    李天禹, 畠山勇輔, 藤田伸尚, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2017/03/01

  74. Al‐Cu‐Ru系1/1近似結晶の構造評価

    李天禹, 藤田伸尚, 西本一恵, 蔡安邦

    日本金属学会東北支部研究発表大会予稿集　2017

  75. Order-disorder transition associated with the cluster arrangement of an Al-based quasicrystalline approximant

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2017

    More details Close

    <p>Al-Pd-Ru系近似結晶においては、クラスタの配列自由度と関連したある種の相変態、および温度変化による秩序・無秩序相転移の可能性が指摘されている[1]。本研究では、転移温度近傍における組織形態や物理量（比熱、エントロピー、相関関数等）の振る舞いを理論的に明らかにするために、ミニマルモデルとしてIsing型のハミルトニアンを導入し、モンテカルロシミュレーションを行う。[1]藤田，畠山，西本：日本物理学会2016年秋季大会，14aAB-5.</p>

  76. Merohedral twinning in the Al-Pd-Ru 3/2 cubic approximant

    Fujita Nobuhisa, Hatakeyama Yusuke, Nishimoto Kazue

    Meeting Abstracts of the Physical Society of Japan　2016

    More details Close

    <p>Al-Pd-Ru系3/2立方近似結晶(旧来の命名法では2/1近似結晶)の単結晶を作製し、X線回折及び電子顕微鏡を用いた構造調査を行った。その結果、空間群R3の結晶ドメインがmerohedral twinningを形成していることが明らかになった。この知見は、Al-Pd-Mn-Si系またはAl-Rh-Si系で報告されている同様の結晶に対する既存の構造理解に抜本的な修正を迫るものである。実験データに基づく構造解析とともに、twin形成機構をモンテカルロシミュレーションを用いて明らかにする。</p>

  77. Mg‐Cd‐Yb準結晶/Mg界面の整合性

    大橋諭, 藤田伸尚, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2015/09/02

  78. Al‐Pd‐Ru系近似結晶の単結晶作製およびその構造評価

    畠山勇輔, 藤田伸尚, 大橋諭, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2015/09/02

  79. Al‐Pd‐Ru系正二十面体準結晶および近似結晶の探索

    畠山勇輔, 畠山勇輔, 大橋諭, 藤田伸尚, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2015/03/04

  80. 22aCS-3 Possible existence of canonical cell tilings with icosahedral symmetry

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2015

  81. 正二十面体準結晶におけるクラスタ充填問題への幾何学的アプローチ

    藤田伸尚

    日本応用数理学会年会講演予稿集(CD-ROM)　2014/08/27

  82. 8aBE-1 Local degrees of freedom of cluster arrangement in high-order approximants to icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2014/08/22

  83. 29pCB-5 Structure classification of complex ordered materials

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2014/03/05

  84. 29pCB-5 Structure classification of complex ordered materials

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2014

  85. 8aBE-1 Local degrees of freedom of cluster arrangement in high-order approximants to icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2014

  86. Al‐Cu‐Fe‐Mn系合金における準結晶および近似結晶の形成条件

    小柏真, 小柏真, 藤田伸尚, 山田庸公, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2013/09/03

  87. Construction of canonical cell tilings with long periods by the use of point substitution processes II

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2013/08/26

  88. 29aEP-5 Construction of canonical cell tilings with long periods by the use of point substitution processes

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2013/03/26

  89. 29aEP-11 Electronic structures and charge transfer estimation of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S, Terauchi M, Fujita N, Tsai A. P

    Meeting abstracts of the Physical Society of Japan　2013/03/26

  90. Al‐Pd‐TM(TM=(Cr,Fe),(Mo,Fe))合金における正二十面体準結晶および近似結晶の形成条件

    小柏真, 藤田伸尚, 山田庸公, 蔡安邦

    日本金属学会講演概要(CD-ROM)　2013/03/13

  91. 29aEP-5 Construction of canonical cell tilings with long periods by the use of point substitution processes

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2013

  92. 29aEP-11 Electronic structures and charge transfer estimation of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S, Terauchi M, Fujita N, Tsai A. P

    Meeting Abstracts of the Physical Society of Japan　2013

  93. Construction of canonical cell tilings with long periods by the use of point substitution processes II

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2013

  94. 20aCA-1 The configuration order of clusters in an Al-Pd-Cr-Fe approximant

    Fujita Nobuhisa, Yamamoto Akiji, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　2012/08/24

  95. 20pCA-4 Electron structures study of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S, Terauchi M, Fujita N, Tsai A. P

    Meeting abstracts of the Physical Society of Japan　2012/08/24

  96. 27aGF-5 Structural modeling of Al-based F-type icosahedral phases and their approximants

    Fujita Nobuhisa, Takano Hikaru, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　2012/03/05

  97. 27aGF-5 Structural modeling of Al-based F-type icosahedral phases and their approximants

    Fujita Nobuhisa, Takano Hikaru, Tsai An-Pang

    Meeting Abstracts of the Physical Society of Japan　2012

  98. 20aCA-1 The configuration order of clusters in an Al-Pd-Cr-Fe approximant

    Fujita Nobuhisa, Yamamoto Akiji, Tsai An-Pang

    Meeting Abstracts of the Physical Society of Japan　2012

  99. 20pCA-4 Electron structures study of Al-Pd-Cr-Fe alloys by using EELS and SXES

    Koshiya S, Terauchi M, Fujita N, Tsai A. P

    Meeting Abstracts of the Physical Society of Japan　2012

  100. 21aRC-4 A simulation study on the growth of silica mesoporous crystals with 12-fold symmetry

    Fujita Nobuhisa, Xiao Changhong, Terasaki Osamu

    Meeting abstracts of the Physical Society of Japan　2011/08/24

  101. 22pGD-1 Random things with a Linear phason stain

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2011/08/24

  102. 27pEG-5 Phason fluctuations in the Boron-based decagonal quasicrystal

    Fujita N, Takano H, Tsai A. P

    Meeting abstracts of the Physical Society of Japan　2011/03/03

  103. 非周期タイル張りの結晶学

    藤田 伸尚

    日本結晶学会誌　2011

  104. 27pEG-5 Phason fluctuations in the Boron-based decagonal quasicrystal

    Fujita N, Takano H, Tsai A. P

    Meeting Abstracts of the Physical Society of Japan　2011

  105. 22pGD-1 Random things with a Linear phason stain

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2011

  106. 21aRC-4 A simulation study on the growth of silica mesoporous crystals with 12-fold symmetry

    Fujita Nobuhisa, Xiao Changhong, Terasaki Osamu

    Meeting Abstracts of the Physical Society of Japan　2011

  107. 24pXL-3 Structural modeling of icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2010/08/18

  108. 20pHX-2 Geometry of quasiperiodic tilings and quasicrystal structure

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2010/03/01

  109. 20pHX-2 Geometry of quasiperiodic tilings and quasicrystal structure

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2010/03/01

  110. 20pHX-2 Geometry of quasiperiodic tilings and quasicrystal structure

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2010

  111. 20pHX-2 Geometry of quasiperiodic tilings and quasicrystal structure

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2010

  112. 24pXL-3 Structural modeling of icosahedral quasicrystals

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2010

  113. 25aYB-4 On the structural stability of Laves phases in quasibinary alloys (Cd,Mg)_2RE

    Fujita Nobuhisa, Kikuchi Shinichi, Tsai An-Pang

    Meeting abstracts of the Physical Society of Japan　2009/08/18

  114. 28pYK-9 New decagonal tilings with fractal windows and phason fluctuations

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2009/03/03

  115. 28pYK-9 New decagonal tilings with fractal windows and phason fluctuations

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2009

  116. 25aYB-4 On the structural stability of Laves phases in quasibinary alloys (Cd,Mg)_2RE

    Fujita Nobuhisa, Kikuchi Shinichi, Tsai An-Pang

    Meeting Abstracts of the Physical Society of Japan　2009

  117. 20pYJ-2 Dense packing with icosahedral clusters

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2008/08/25

  118. 24aWA-2 Icosahedral quasilattices generated by the point inflation rule

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2008/02/29

  119. 24aWA-2 Icosahedral quasilattices generated by the point inflation rule

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2008

  120. 20pYJ-2 Dense packing with icosahedral clusters

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2008

  121. 23pXQ-7 An analysis of local coordination in quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2007/08/21

  122. 19pRF-12 Ab initio study on the effects of chemical substitution for the stability of Cd-RE compounds

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2007/02/28

  123. 19pRF-12 Ab initio study on the effects of chemical substitution for the stability of Cd-RE compounds

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2007

  124. 23pXQ-7 An analysis of local coordination in quasicrystals

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2007

  125. 23pYP-7 Ab initio calculations for Cd_2RE Laves phases and the structural stability of quasicrystals

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2006/08/18

  126. 23pYP-7 Ab initio calculations for Cd_2RE Laves phases and the structural stability of quasicrystals

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2006

  127. 14pTK-3 Electronic properties of curved surfaces : effects of curvature, symmetry, and topology

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2004/08/25

  128. 14pTK-3 Electronic properties of curved surfaces : effects of curvature, symmetry, and topology

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2004

  129. An Intrusion Detection Strategy Based on Data Aggregation and Shannon Entropy

    FUJITA Nobuhisa, SHIRATORI Norio

    IPSJ SIG Notes　2003/02/27

    More details Close

    We have devised a general algorithm for classifying audit data into clusters associated with different types of network activities, in view of developing a more robust way of profiling network entities for intrusion detection. The method is based on the aggregation of the network hosts. The capability of the algorithm is examined by analyzing some log data of SNORT. A probable advantage of our algorithm lies in its ability to discern distributed attacks more effectively than any of the existing algorithms.

  130. An Intrusion Detection Strategy Based on Data Aggregation and Shannon Entropy

    Fujita Nobuhisa, Shiratori Norio

    IPSJ SIG Notes　2003/02/27

    More details Close

    We have devised a general algorithm for classifying audit data into clusters associated with different types of network activities, in view of developing a more robust way of profiling network entities for intrusion detection. The method is based on the aggregation of the network hosts. The capability of the algorithm is examined by analyzing some log data of SNORT. A probable advantage of our algorithm lies in its ability to discern distributed attacks more effectively than any of the existing algorithms.

  131. Network Monitoring at the JGN Tohoku University office

    KOIDE Kazuhide, CHAKRABORTY Debasish, FUJITA Nobuhisa, SAITO Takeo, MANSFIELD Glenn, SHIRATORI Norio

    IEICE technical report. Communication systems　2002/10/01

    More details Close

    In this report, we present recent research effort and progress on network monitoring at the JGN (Japan Gigabit Network) Tohoku University office. In order to achieve a scalable collection of operational information within a large-scale computer network, distributed network monitoring system would be inevitable. We describe the present status of research on two key technologies, distributed collection techniques of operational information, and the integration techniques of the collected information. We also present the network information visualization system, JaNI, which has been developed at the JGN office and dedicated to provide information regarding the network even to the users.

  132. A Destination Oriented Distributed Routing Method for Dynamic Multipoint Connection

    CHAYABEJARA A, CHAKRABORTY D, ZABIR S. M. S, KHAN A, FUJITA N, SHIRATORI N

    IEICE technical report. Communication systems　2002/10/01

    More details Close

    Single point, sender based control does not adapt or scale well for multicast delivery. For applications, such as group video or teleconferencing a low total cost multicast tree is required. In this article we present a destination driven algorithm to minimize the total tree cost of multicast tree in a dynamic situation for the whole session duration. In this heuristic approach we considered the staying duration of participants are available at the time of joining. The performance of our algorithm is analyzed through extensive simulation and evaluated against several other existing dynamic multicast routing and also against one well known near optimum heuristic algorithm used for solving Steiner tree problem. We have further tested our algorithm using erroneous information given by the joining participants. Simulation results shows that it performs equally well even when the range of error is considerably high, which proves the robustness of our algorithm.

  133. Network Monitoring at the JGN Tohoku University office

    KOIDE Kazuhide, CHAKRABORTY Debasish, FUJITA Nobuhisa, SAITO Takeo, MANSFIELD Glenn, SHIRATORI Norio

    IEICE technical report　2002/10/01

    More details Close

    In this report, we present recent research effort and progress on network monitoring at the JGN (Japan Gigabit Network) Tohoku University office. In order to achieve a scalable collection of operational information within a large-scale computer network, distributed network monitoring system would be inevitable. We describe the present status of research on two key technologies, distributed collection techniques of operational information, and the integration techniques of the collected information. We also present the network information visualization system, JaNI, which has been developed at the JGN office and dedicated to provide information regarding the network even to the users.

  134. A Destination Oriented Distributed Routing Method for Dynamic Multipoint Connection

    CHAYABEJARA A, CHAKRABORTY D, ZABIR S. M. S, KHAN A, FUJITA N, SHIRATORI N

    IEICE technical report　2002/10/01

    More details Close

    Single point, sender based control does not adapt or scale well for multicast delivery. For applications, such as group video or teleconferencing a low total cost multicast tree is required. In this article we present a destination driven algorithm to minimize the total tree cost of multicast tree in a dynamic situation for the whole session duration. In this heuristic approach we considered the staying duration of participants are available at the time of joining. The performance of our algorithm is analyzed through extensive simulation and evaluated against several other existing dynamic multicast routing and also against one well known near optimum heuristic algorithm used for solving Steiner tree problem. We have further tested our algorithm using erroneous information given by the joining participants. Simulation results shows that it performs equally well even when the range of error is considerably high, which proves the robustness of our algorithm.

  135. Network Monitoring at the JGN Tohoku University office

    KOIDE Kazuhide, CHAKRABORTY Debasish, FUJITA Nobuhisa, SAITO Takeo, MANSFIELD Glenn, SHIRATORI Norio

    IEICE technical report. Information networks　2002/09/24

    More details Close

    In this report, we present recent research effort and progress on network monitoring at the JGN (Japan Gigabit Network) Tohoku University office. In order to achieve a scalable collection of operational information within a large-scale computer network, distributed network monitoring system would be inevitable. We describe the present status of research on two key technologies, distributed collection techniques of operational information, and the integration techniques of the collected information. We also present the network information visualization system, JaNI, which has been developed at the JGN office and dedicated to provide information regarding the network even to the users.

  136. A Destination Oriented Distributed Routing Method for Dynamic Multipoint Connection

    CHAYABEJARA A, CHAKRABORTY D, ZABIR S. M. S, KHAN A, FUJITA N, SHIRATORI N

    IEICE technical report. Information networks　2002/09/24

    More details Close

    Single point, sender based control does not adapt or scale well for multicast delivery. For applications, such as group video or teleconferencing a low total cost multicast tree is required. In this article we present a destination driven algorithm to minimize the total tree cost of multicast tree in a dynamic situation for the whole session duration. In this heuristic approach we considered the staying duration of participants are available at the time of joining. The performance of our algorithm is analyzed through extensive simulation and evaluated against several other existing dynamic multicast routing and also against one well known near optimum heuristic algorithm used for solving Steiner tree problem. We have further tested our algorithm using erroneous information given by the joining participants. Simulation results shows that it performs equally well even when the range of error is considerably high, which proves the robustness of our algorithm.

  137. Growth kinetics on quasicrystalline surfaces

    Fujita Nobuhisa

    Meeting abstracts of the Physical Society of Japan　2002/08/13

  138. EIectronic structures of the period-doubling lattice and other aperiodic lattices with non-invertible substitution rules

    Endou Rihei, Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　2002/08/13

  139. EIectronic structures of the period-doubling lattice and other aperiodic lattices with non-invertible substitution rules

    Endou Rihei, Fujita Nobuhisa, Niizeki Komajiro

    Meeting Abstracts of the Physical Society of Japan　2002

  140. Growth kinetics on quasicrystalline surfaces

    Fujita Nobuhisa

    Meeting Abstracts of the Physical Society of Japan　2002

  141. Pseudo-localized one-electron states in one-dimensional quasiperiodic or aperiodic chains

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　2000/03/10

  142. Pseudo-localized one-electron states in one-dimensional quasiperiodic or aperiodic chains

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting Abstracts of the Physical Society of Japan　2000

  143. Electron-electron interaction may break the universality class of the Fibonacci lattice

    FUJITA Nobuhisa, NIIZEKI Komajirou

    Meeting abstracts of the Physical Society of Japan　1998/09/05

  144. Electron-electron interaction may break the universality class of the Fibonacci lattice

    FUJITA Nobuhisa, NIIZEKI Komajirou

    Meeting Abstracts of the Physical Society of Japan　1998

  145. 29a-R-4 Electronic Properties of a Generalized Fibonacci Model

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　1997/03/17

  146. 29a-R-4 Electronic Properties of a Generalized Fibonacci Model

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting abstracts of the Physical Society of Japan　1997/03/17

  147. 29a-R-4 Electronic Properties of a Generalized Fibonacci Model

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting Abstracts of the Physical Society of Japan　1997

  148. 29a-R-4 Electronic Properties of a Generalized Fibonacci Model

    Fujita Nobuhisa, Niizeki Komajiro

    Meeting Abstracts of the Physical Society of Japan　1997

  149. 1a-E-9 Electronic Eigenstates on a generalized-Fibonacci-Lattice

    藤田 伸尚, 新関 駒二郎

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　1996/03/15

  150. 1a-E-9 Electronic Eigenstates on a generalized-Fibonacci-Lattice

    藤田 伸尚, 新関 駒二郎

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　1996/03/15

  151. 1a-E-9 Electronic Eigenstates on a generalized-Fibonacci-Lattice

    藤田 伸尚, 新関 駒二郎

    Meeting Abstracts of the Physical Society of Japan　1996

  152. 1a-E-9 Electronic Eigenstates on a generalized-Fibonacci-Lattice

    藤田 伸尚, 新関 駒二郎

    Meeting Abstracts of the Physical Society of Japan　1996

Show all Show first 5

Research Projects 8

  1. Structure of hypermaterials

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: Hokkaido University

    2019/06/28 - 2024/03/31

  2. 複雑合金結晶の相形成マップと構造制御 Competitive

    藤田 伸尚

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業: 基盤研究(C)

    2018/04 - 2022/03

  3. Tailoring the topological properties of materials via auxiliary space dimensions Competitive

    FUJITA Nobuhisa

    Offer Organization: Japan Science and Technology Agency

    System: Strategic Basic Research Programs: PRESTO

    2015/10 - 2019/03

  4. アルミ・遷移金属系Ｆ型正二十面体準結晶及び関連合金の構造解明 Competitive

    藤田 伸尚

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業: 基盤研究(C)

    2013/04 - 2016/03

  5. Self-organization of nanostructure by dealloying of intermetallic compounds for creating novel catalytic function

    TSAI anpang, KAMEOKA Satoshi, FUJITA Nobuhisa, NISHIMURA Chikashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2011/04/01 - 2015/03/31

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    We have studied microstructure and catalytic properties for leaching Al-base intermetallic compounds. It has been clear the microstructure after leaching is dominated by oxidation ability of the metals formed intermetallic compounds with Al. A lamellar Fe3O4/Pt/Fe3O4 prepared by leaching Al-Pt-Fe alloy exhibited significant catalytic activity and selectivity upon steam reforming of methanol (SRM). The Pt and Fe3O4 were primarily responsible for the catalysis of the decomposition of methanol and water gas shift reaction, respectively. These two reactions work together in a complementary way to facilitate the overall SRM reaction. We demonstrate that a composite structure is available to couple two separate reactions to obtain a new catalytic function. We developed Pt/Fe3O4 catalyst with high activity upon CO oxidation, prepared by leaching an Al-Fe-Pt alloy with a minute amount of Pt and a new process to synthesize a composite catalyst Cu/CeO2/Ag by oxidation of amorphous alloy.

  6. Fabrication of non-equilibrium nanoparticles by selective leaching and their catalytic properties

    TSAI An-pang, KAMEOKA Satoshi, FUJITA Nobuhisa, ISHIKAWA Kazuhiro, SHIMODA Masahiko

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2010 - 2011

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    It has been found that selective leaching of Al on ternary Al alloys facilitates formation of nonequilibrium phases composed of remaining elements. This process can force the formation of non-equilibrium states which could no reached by melt-spinning method. By applying this process, we found that PdNi nanoparticles formed as a product of leached Al-Pd-Ni alloy showed high activity over CO oxidation reaction comparable with Pt. In summary, we have demonstrated that the leaching is not only a process synthesizing catalysts but also an available process for preparing nonequilibrium phases.

  7. Development of alloys replacing rare metals for catalysis

    TSAI An-pang, KAMEOKA Satoshi, ISHII Yasushi, FUJITA Nobuhisa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2007 - 2010

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    PdZn shows comparable catalytic selectivity to Cu in steam-reforming of methanol (SRM)reaction reflecting their similar electronic structures near the Fermi level (E_F). First-principles slab calculations for M-Zn (M=Pd, Ni, Pt)reveal that alloying with Zn leads to drastic change in the d-band width of M elements and it is essential for a similar electronic structure to Cu. The reduction of the d-band width is a consequence of the missing M-M pair and the lattice distortion. Measurements for SRM, CO and H_2 adsorptions have been performed for alloy powders of M_<50> Zn_<50> intermetallic compounds and M/ZnO samples and has been verified that chemical properties are expected from calculated electronic density of states (DOS). Unsupported mesoporous intermetallic NiZn and PdZn catalysts are successfully prepared by means of immersion alloying process. The surface areas of resultant alloy catalysts reached over ~ 20 m^2/g. The catalytic properties for steam reforming of methanol (SRM)were completely different from the original unsupported porous Ni and Pd, where the decomposition of methanol and the SRM occurred preferentially on NiCu and PdZn. In terms of selectivity of the reaction, NiCu is very similar to Pd and their similarity in valence DOSs was verified, indicating availability of the idea developed in the present research.

  8. Theoretical study on the electronic properties of intermetallic compounds including quasicrystals Competitive

    System: Basic Science Research Program

    2005/11 -

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Teaching Experience 8

  1. 令和5年度大学院特別セミナー（准教授セミナー）「金属電子論入門」　東北大学 工学研究科 マテリアル・開発系

  2. Geometry of quasicrystals　Tohoku University Postgraduate

  3. A theoretical guide to quasiperiodic tilings　Aperiodic2021 Workshop: Aperiodic order and Physical Propertices for beginners - ISH2021 (1st International School on Hypermaterials) (zoom, June 21-25, 2021).

  4. Theoretical introduction to quasiperiodic structures

  5. 演習：曲面の変分問題の可視化　JSTさきがけ数学塾「変分法入門～幾何学と解析学の橋渡し。そして応用へ～

  6. 極小曲面を用いた量子ナノ構造　JSTさきがけ数学塾「変分法入門～幾何学と解析学の橋渡し。そして応用へ～

  7. Aperiodic tiling　International School on Aperiodic Crystals (La Valérane Carqueiranne, France, September 26—October 2, 2010).

  8. Electronic structure of solid-state materials　Stockholm University, Arrhenius Laboratory, Department of Structural Chemistry

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Media Coverage 2

  1. みんなのカガク「準結晶」複雑な規則性

    読売新聞　夕刊 ５ページ目

    2022/02/24

    Type: Newspaper, magazine

  2. 酸化ケイ素で準結晶～金属含まぬ無機物で作製～東北大

    日経産業新聞　６ページ目

    2012/07/25

    Type: Newspaper, magazine