HISASHI NAKAI

International Education CenterAssociate Professor
  • Profile:
    1995- Growth mechanism of metal thin films.
    2000-2005 Sample preparation of TEM.

Degree

  • 工学修士, 横浜国立大学, Mar. 1988
  • Ph.D. in Engineering, Yokohama National University, Mar. 1995

Research Keyword

  • 金属薄膜初期成長過程の漸近的性質

Field Of Study

  • Nanotechnology/Materials, Thin-film surfaces and interfaces
  • Nanotechnology/Materials, Nanostructure physics

Career

  • 01 Apr. 2021
    国際教育センター, 准教授
  • 01 Feb. 2017 - 31 Mar. 2021
    国際教育センター, 講師
  • 01 Apr. 2010 - 31 Jan. 2017
    国際交流センター, 講師
  • Aug. 1996 - 31 Mar. 2010
    Faculty of electro-communications, The Univ. of Electoro-Comm., Assistant professor

Educational Background

  • Apr. 1988 - Aug. 1991
    Yokohama National University, Graduate School of Engineering, Division of Mechanical Engineering and Materials Science, 博士後期課程
  • Apr. 1986 - Mar. 1988
    Yokohama National University, Graduate School of Engineering, Division of Mechanical Engineering and Materials Science, 博士前期課程
  • Apr. 1982 - Mar. 1986
    Tokai University, Faculty of Engineering, 応用物理学科
  • 01 Apr. 1979 - 31 Mar. 1982
    東京都立小平西高等学校

Paper

  • Scaling analysis for submonolayer growth of point islands based on Widom scaling law
    Hisashi NAKAI
    Bulletin of the University of Electro-Communications, 34, 1, 23-31, 01 Feb. 2022, Peer-reviwed
    Research institution, Japanese
  • Scaling form of capture-zone distribution in four-dimensional growth of point island
    Hisashi NAKAI
    Bulletin of the University of Electro-Communications, 32, 1, 47-53, 01 Feb. 2020, Peer-reviwed
    Research institution, Japanese
  • Spatial dimension dependence for the average capture number in submonolayer growth of point islands
    Hisashi NAKAI
    電気通信大学紀要, 31, 1, 97-103, 01 Feb. 2019, Peer-reviwed
    Research institution, Japanese
  • Scaling theory for submonolayer growth of point Islands based on the minimal model
    Hisashi NAKAI
    Bulletin of The University of Electro-Communications, The University of Electro-Communications, 30, 1, 300107, 01 Feb. 2018, Peer-reviwed
    Research institution, Japanese
  • Asymptotic analysis for cumulative local size for one-dimensional submonolayer growth
    Hisashi NAKAI
    Bulletin of The University of Electro-Communications, The University of Electro-Communications, 29, 1, 290105-290105, 01 Feb. 2017, Peer-reviwed, By dimensional analysis, it is confirmed that a cumulative local size xy for one-dimentional irreversible submonolayergrowth of point islands [J. G. Amar and M. N. Popescu, Surf. Sci. 419, 239 (2001)] is expressed bya function of scaled gap length Y and dimensionless deposition time R1/3θ, where R is the ratio of the monomerdiffusion rate to the deposition rate and θ is coverage. Using asymptotic analysis for xy as the limit R Ishow that xy/sav I = 1/B ∫ 1 ϕY uα tanh (YBu−α) du, where B is a certain monotonically decreasing function ofthe variable R1/3θ, α is dynamical exponent of nucleation length and sav is average size. At both of the numericalresult of xy/sav and the approximate analytical evaluation for the integral I with Taylor expansion in YB for theintegrand, correction term for Y Y−3( or limit of xy/sav as is shown to be proportional to (R1/3θ)−3/4,and the analytical evaluation is in good agreement with the numerical result in R1/3θ 400. Finally, I findanother evaluation for I with the expansion in α to improve the deviation in 100 R1/3θ < 400.
    Research institution, Japanese
  • Information Processing Exercises Designed for Undergraduate International Students at the University of Electro-Communications
    NAKAI Hisashi
    The Tama Bulletin of International Student Education, 電気通信大学国際交流推進センター ; 2006-, 10, 10, 31-35, Mar. 2016, Peer-reviwed
    Research society, Japanese
  • Power Series Expansion and Analysis for Logarithm of q-Shifted Factorial
    NAKAI, Hisashi
    Bulletin of the University of Electro-Communications, 28, 1, 1-9, 02 Feb. 2016, Peer-reviwed
    Research institution, Japanese
  • Numerical Solutions and Error Estimation for the Gap length in One-dimensional Submonolayer Film Growth
    NAKAI, Hisashi
    Bulletin of the University of Electro-Communications, 電気通信大学, 27, 1, 37-43, 27 Feb. 2015, Peer-reviwed, Numerical solutions and an error estimation formula for gap ys between an island with size s and another island in one-dimensional submonolayer growth are presented. The origin of the error is assumed to be the numerical integral computation included in an equation for the ys. In order to evaluate the error for YM, which is the numerical approximation of ys, numerical integrations in the equation of ys are calculated with composite trapezoidal rule using 1/2M, M and 2M of number of equal divided interval. As a result, the error of the gap for M = 213 of the divided number is a onethird for the difference Ys M/2 Ys M . Similarly, the error for the numerical solution of the island size distribution Ns M is the 1/4.2 of Ns M/2 Ns M and was less than 7 × 10--9. My size-distribution result is compared to both the results of literature on the kinetic Monte-Carlo simulation and the rate equation.
    Research institution, Japanese
  • Exercises in introductory physics for international freshmen at UEC
    NAKAI Hisashi
    The Tama Bulletin of International Student Education, 電気通信大学国際交流推進センター, 8, 8, 51-55, Mar. 2012, Peer-reviwed
    Research society, Japanese
  • Preparatory Engineering Related Education of Japan-Korea Joint Government Scholarship Program for the Students in Science and Engineering Departments at UEC Tokyo
    NAKAI Hisashi; HAMANO Tetze
    The Tama Bulletin of International Student Education, 電気通信大学国際交流推進センター, 8, 8, 57-61, Mar. 2012, Peer-reviwed
    Research society, Japanese
  • A Report on the Preparatory Engineering Education for International Undergraduate Students in UEC
    lKOYAMA Naoto; OKUYAMA Naoki; NAKAI Hisashi
    多摩留学生教育研究論集, Tokyo Gakugei University, 5, 71-74, Mar. 2006, Peer-reviwed
    Research institution, Japanese
  • Synthesis of Fe2W by low pressure laser spraying
    Y Isshiki; J Shi; H Nakai; M Hashimoto
    SURFACE & COATINGS TECHNOLOGY, 151, 325-328, Mar. 2002, Peer-reviwed
    Scientific journal, English
  • Microstructure, microhardness, composition, and corrosive properties of stainless steel 304 II. Low-pressure laser spraying with silicon
    Y Isshiki; J Shi; H Nakai; M Hashimoto
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 70, 6, 651-656, Jun. 2000
    Scientific journal, English
  • Epitaxial growth structure and physical properties of Fe film biased dc-plasma sputter deposited on MgO(001)
    CC Chen; JP Yang; H Nakai; M Hashimoto
    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 18, 3, 819-822, May 2000
    Scientific journal, English
  • Microstructure, microhardness, composition, and corrosive properties of stainless steel 304 - I. Laser surface alloying with silicon by beam-oscillating method
    Y Isshiki; J Shi; H Nakai; M Hashimoto
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 70, 4, 395-402, Apr. 2000
    Scientific journal, English
  • Si(001)およびSiO_x_基板上のCuSi_x_真空蒸着薄膜の電気特性と構造
    松原裕人; 楊 季平; 牧原健二; 史 蹟; 中井日佐司
    第47回応用物理学関係連合講演会講演予稿集Ⅱ, 599, Mar. 2000
    Japanese
  • 分子線蒸着法によるSi(111)面上のCu薄膜初期成長過程Ⅱ
    水島博昭; 史 蹟; 中井日佐司; 橋本 満
    第61回応用物理学会講演予稿集Ⅱ, 488, 2000
    Japanese
  • GaAs(001),Si(001)およびSiO_2_基板上のCu,Cu-13%Si真空蒸着薄膜の電気特性と構造
    楊 季平; 松原裕人; 牧原健二; 史 蹟; 中井日佐司; 橋本 満
    第60回応用物理学会学術講演会予稿集Ⅱ,甲南大学, 497, Sep. 1999
    Japanese
  • 分子線蒸着法によるSi(111)面上でのCu薄膜初期成長過程(2)
    小中敏寛; 中井日佐司; 橋本 満
    第59回応用物理学会学術講演会講演予稿集2, 530, Sep. 1998
    Japanese
  • Intial growth process of Permalloy films epitaxially grown on MgO(001)by dc biased plasma sputtering
    石野正樹; 楊 季平; 史 蹟; 中井日佐司; 橋本 満
    第59回応用物理学会学術講演会講演予稿集2, 536, Sep. 1998
    Japanese
  • Growth structure of nickel films on GaAs(001) by dc-biased plasma-sputter-deposition
    JP Yang; K Makihara; H Nakai; M Hashimoto; A Barna; PB Barna
    THIN SOLID FILMS, 319, 1-2, 115-119, Apr. 1998, Peer-reviwed
    Scientific journal, English
  • Electrical property on copper thin film with chromium under-layer
    H Nakai; K Fudaba; K Shinzawa; M Hashimoto
    THIN SOLID FILMS, 317, 1-2, 202-205, Apr. 1998, Peer-reviwed
    Scientific journal, English
  • Microhardness, microstructure and composition behavior of stainless steel 304 laser surface alloyed with silicon
    Y Isshiki; H Nakai; M Hashimoto
    TRENDS AND NEW APPLICATIONS OF THIN FILMS, 287-2, 263-266, 1998
    Scientific journal, English
  • Phase change during the initial of Ni30Fe70(Invar) films on MgO(001) by DC-biased plasma-sputter-deposition
    JP Yang; K Makihara; H Nakai; J Shi; M Hashimoto; A Barna; PB Barna
    TRENDS AND NEW APPLICATIONS OF THIN FILMS, 287-2, 347-350, 1998
    Scientific journal, English
  • A MODELING OF DIAMOND NUCLEATION
    S YUGO; K SEMOTO; K HOSHINA; T KIMURA; H NAKAI
    DIAMOND AND RELATED MATERIALS, 4, 7, 903-907, May 1995
    Scientific journal, English
  • GROWTH-KINETICS OF ANTIMONY LAYERS PREPARED ON SIOX BY MOLECULAR-BEAM DEPOSITION
    H NAKAI; D BABA; A KOSUGE; M HASHIMOTO
    THIN SOLID FILMS, 259, 1, 32-37, Apr. 1995, Peer-reviwed
    Scientific journal, English
  • AUGER-ELECTRON SPECTROSCOPY ELECTRON ENERGY-LOSS SPECTROSCOPY LOW-ENERGY ELECTRON-DIFFRACTION STUDY OF A V6C5 (100) SURFACE
    S USAMI; H NAKAI; T YAGUCHI; Y KUMASHIRO; A FUJIMORI
    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 5, 4, 985-988, Jul. 1987
    Scientific journal, English

Courses

  • 留学生向け物理学概論第二再履修支援
    Apr. 2024 - Present
    電気通信大学国際教育センター, 学域留学生で物理学概論第二(熱・電磁気)再履修者に対する学修支援。前期開講。, Others
  • 留学生向け物理学概論第一再履修支援
    Oct. 2023 - Present
    電気通信大学国際教育センター, 学域留学生で物理学概論第一(力学・波動)再履修者に対する学修支援。後期開講。, Others
  • Applied Physics Laboratory Ⅱ
    Oct. 2016 - Present
    The University of Electro-Communications, Undergraduate special subjects
  • Information Processing ExerciseII
    Oct. 2016 - Present
    The University of Electro-Communications, Undergraduate special subjects
  • Elementary Exercises in Physics II
    Oct. 2016 - Present
    The University of Electro-Communications, Undergraduate special subjects
  • Information Processing Exercise I
    Apr. 2016 - Present
    The University of Electro-Communications, Undergraduate special subjects
  • Science and Technology in Japan A
    Apr. 2016 - Present
    The University of Electro-Communications, Others
  • Elementary Exercises in Physics Ⅰ
    Apr. 2016 - Present
    The University of Electro-Communications
  • Information Processing Exercise
    The University of Electro-Communications
  • 情報処理演習第一
    電気通信大学
  • Science and Technology in Japan A
    The University of Electro-Communications

Affiliated academic society

  • Aug. 1987 - Present
    応用物理学会

Research Themes

  • Development of on-line educational materials for fundamental subjects of engineering for non-native Japanese speaking students
    TAKEDA Yuko; SHIGA Mikio; NAKAI Hisashi; WATANABE Shigeyoshi; SUZUKI Masahisa
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), The purpose of this study is the development of on-line educational materials of fundamental subjects of engineering for students who are non-native speakers of Japanese. This was pursued through the following investigations. 1. Investigation of vocabulary and expressions found in mathematics textbooks used in Japanese high schools. (1) Listing mathematical vocabulary and expressions found in the textbooks Differential, in Mathematics II, and Mathematics III. The complete list contains a total of 3367 vocabulary items, collocations, sentence patterns, and discourse patterns. (2) Translating the Japanese expressions in this list into Chinese and Korean. (3) Contrasting these translations in order to analyze differences among the three languages and difficulties for non-native speakers of Japanese. 2. Investigation of mathematic problem solving by Chinese students. Two studies were conducted : 1) a study of Japanese expressions found in the solutions of differential problems calculated by Chinese students and 2) a study of the relations among Japanese language ability, mathematical ability, and the understanding and solving of mathematic problems by Chinese students. In study 1), it was found that low Japanese proficiency students use only a "noun WA noun" structure and some basic conjunctions. It was also found that it is difficult for both low and high Japanese proficiency students to use Japanese expressions for naming and replacement in the absence of a model. In study 2), it was found that students with low Japanese proficiency but an adequate background in mathematics can solve mathematical problems written in Japanese. It was also found that Japanese proficiency equivalent to grade 2 of the Japanese proficiency test is necessary for solving such mathematical.problems., 17520344
    2005 - 2007
  • Preparation and Characterization of Nitride-base Magnetic nanocomposite films
    HASHIMOTO Mitsuru; NAKAI Hisashi; SHI J.
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), In this work, the preparation and characterization of Co-Ti-N films have been conducted. First, we have disclosed the relation between the preparation condition and the structure of the Co-Ti-N films. Co-Ti-N films have been prepared by dc sputtering of Co-Ti complex target in Ar +N_2 gas mixture. For the films deposited at appropriate N_2 partial pressure, the reaction between Ti and N occurs to form TiN during post-deposition thermal anneal. As a result Co and Ti separate with each other, to form Co-TiN nano-composite. The sizes of Co and TiN grains in the longitude direction are about 10 nm in diameter. And fiber-like structure is developed along the normal direction of the film surface. Next the magnetic properties of the Co-TiN nanocomposite films have been investigated. It has been found Co-TiN nanocomposite films with their thickness less than 100 nm show similar magnetization behavior in both longitude and perpendicular directions. However, those films with their thickness above 100 nm show perpendicular magnetic anisotropy, I.e. perpendicular direction becomes the easy axis of magnetization. Furthermore, the dependence of magnetic properties on the thermal anneal condition and film structure have been investigated. The as-deposited films almost do not show ferromagnetic performance. When the films were annealed at 400 - 700℃, they show clearly ferromagnetic performance and the saturation magnetization increased with increasing anneal temperature. This is because that in the as-deposited state, Co atoms are bonded to Ti and N, upon thermal anneal at elevated temperature, N atoms preferentially react with Ti atoms, therefore, Co is separated. The magnetic properties of the Co-TiN films also depend strongly on the amount of N incorporated into the films. When N amount is too small, the phase separation can not fully proceed. On the other hand, when the N amount is too large, Co is also nitrided except Ti. Both cases will impair the saturation magnetization. Therefore it is important to control the N amount in the film. Beside the magnetic properties, we have found that the resistivity and hardness of Co-TiN nanocomposite films are very high compared with metal and alloy films. According to the result of this research work, we consider the Co-TiN-based nanocomposite films very promising as ultra-high density perpendicular magnetic recording media., 12650656
    2000 - 2001

Academic Contribution Activities

  • 大学・学部・学科/部会・教科(含む実験等)の教育プログラム等の改善・修正などへの関与
    Others, Planning etc, 01 Apr. 2024 - 31 Jul. 2024, 留学生向けネットワークポリシー講習(4月入学生) 4月入学院生・研究生の留学生対象ネットワークポリシー講習会の企画・実施。情報システム関連の手続・講習のために必要なwebclassへのアクセス方法、情報システム利用に関する誓約書の内容説明および提出、INFOSS受講登録を含む。また、受講登録方法や期限までに受講していない留学生に対するフォローアップ。

Others

  • ネットワークポリシー研修
    10月上旬〜中旬にネットワークポリシー研修(対面、オンデマンド+ヘルプデスク)開催。研究生・院生である留学生対象。参加者8名(対面 8名、オンデマンド+ヘルプデスク 0 名)。
    Oct. 2024 - Oct. 2024
  • ネットワークポリシー研修
    4月上旬〜中旬にネットワークポリシー研修(対面、オンデマンド+ヘルプデスク)開催。研究生・院生である留学生対象。参加者16名(対面 16名、オンデマンド 0 名)。
    Apr. 2024 - Apr. 2024
  • 2023年度国費学部留学生大学進学説明会(大阪大学)
    ビデオ会議システム(ZOOM)を使用して、大阪大学で予備教育を受けている学部国費留学生向けに進学説明を行った。回数は30分を2回であり、15名の参加があった。
    ※2024年度は、この留学制度による留学生が4名配置された。
    Nov. 2023 - Nov. 2023