World's Best Scientists 2026 revealed!
Hiromi Nakai

Hiromi Nakai

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 54 12561 11302 947 866 370 11018

Hiromi Nakai publications per year

The chart shows the history of publications by Hiromi Nakai between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hiromi Nakai published across 36 years, from 1990 to 2025, averaging 11.9 papers a year. Output peaked at 27 publications in 2020. 32 of the 427 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 27. Peak 27 publications in 2020. 1990: 1 publication 1991: 2 publications 1992: 4 publications 1993: 4 publications 1994: 2 publications 1995: 3 publications 1996: 5 publications 1997: 6 publications 1998: 4 publications 1999: 2 publications 2000: 4 publications 2001: 5 publications 2002: 5 publications 2003: 7 publications 2004: 9 publications 2005: 14 publications 2006: 13 publications 2007: 26 publications 2008: 13 publications 2009: 13 publications 2010: 13 publications 2011: 19 publications 2012: 16 publications 2013: 20 publications 2014: 9 publications 2015: 16 publications 2016: 15 publications 2017: 21 publications 2018: 23 publications 2019: 25 publications 2020: 27 publications 2021: 20 publications 2022: 13 publications 2023: 16 publications 2024: 15 publications 2025: 17 publications
1990 2025

427 publications in total across all disciplines

View publications per year as a table
Hiromi Nakai: publications per year, 1990 to 2025
Year Publications
1990 1
1991 2
1992 4
1993 4
1994 2
1995 3
1996 5
1997 6
1998 4
1999 2
2000 4
2001 5
2002 5
2003 7
2004 9
2005 14
2006 13
2007 26
2008 13
2009 13
2010 13
2011 19
2012 16
2013 20
2014 9
2015 16
2016 15
2017 21
2018 23
2019 25
2020 27
2021 20
2022 13
2023 16
2024 15
2025 17
Total 427
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Hiromi Nakai publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Hiromi Nakai sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 361–380 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 370 publications — 76th percentile

76% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522 370
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Hiromi Nakai D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Hiromi Nakai sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 54–55 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 54 D-Index — 31st percentile

31% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933 54
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Hiromi Nakai is affiliated with Waseda University in Japan and has contributed extensively to the fields of chemistry, physics and astronomy, and materials science. Their research spans multiple subfields including atomic and molecular physics and optics, materials chemistry, organic chemistry, electrical and electronic engineering, and physical and theoretical chemistry.

The scientist's publications focus on advanced chemical physics studies, spectroscopy and quantum chemical studies, photochemistry and electron transfer, X-ray diffraction in crystallography, machine learning in materials science, organoboron and organosilicon chemistry, and catalysis and oxidation reactions.

Frequent publication venues for Hiromi Nakai include:

  • The Journal of Chemical Physics
  • Journal of Computer Chemistry Japan
  • The Cambridge Structural Database
  • Chemical Physics Letters
  • Journal of Chemical Theory and Computation

Collaborations have been conducted with several researchers including Yasuhiro Ikabata, Yoshifumi Nishimura, Yoshiaki Shoji, Takanori Fukushima, and Aditya Wibawa Sakti.

Notable recent papers authored or coauthored by Hiromi Nakai are:

  • "Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube", 2020, Nature Communications
  • "Orbital-free density functional theory calculation applying semi-local machine-learned kinetic energy density functional and kinetic potential", 2020, Chemical Physics Letters
  • "Collaborative virtual screening to elaborate an imidazo[1,2-a]pyridine hit series for visceral leishmaniasis", 2021, RSC Medicinal Chemistry
  • "Agglomeration Suppression of a Fe-Supported Catalyst and its Utilization for Low-Temperature Ammonia Synthesis in an Electric Field", 2020, ACS Omega
  • "An Air- and Water-Stable B4N4-Heteropentalene Serving as a Host Material for a Phosphorescent OLED", 2021, Angewandte Chemie International Edition

Best Publications

  • Theoretical Analysis of Interactions between Potassium Ions and Organic Electrolyte Solvents: A Comparison with Lithium, Sodium, and Magnesium Ions

    Masaki Okoshi;Masaki Okoshi;Yuki Yamada;Yuki Yamada;Shinichi Komaba;Shinichi Komaba;Atsuo Yamada;Atsuo Yamada

  • Theoretical Analysis on De-Solvation of Lithium, Sodium, and Magnesium Cations to Organic Electrolyte Solvents

    Masaki Okoshi;Yuki Yamada;Yuki Yamada;Atsuo Yamada;Atsuo Yamada;Hiromi Nakai

  • Unveiling a New Aspect of Simple Arylboronic Esters: Long-Lived Room-Temperature Phosphorescence from Heavy-Atom-Free Molecules.

    Yoshiaki Shoji;Yasuhiro Ikabata;Qi Wang;Daisuke Nemoto

  • Density functional method including weak interactions: Dispersion coefficients based on the local response approximation.

    Takeshi Sato;Hiromi Nakai

  • An extension of ab initio molecular orbital theory to nuclear motion

    Masanori Tachikawa;Kazuhide Mori;Hiromi Nakai;Kaoru Iguchi

  • Alternative linear-scaling methodology for the second-order Møller-Plesset perturbation calculation based on the divide-and-conquer method

    Masato Kobayashi;Yutaka Imamura;Hiromi Nakai

  • Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube

    Ken ichi Otake;Kazuya Otsubo;Tokutaro Komatsu;Tokutaro Komatsu;Shun Dekura;Shun Dekura

  • Simultaneous determination of nuclear and electronic wave functions without Born–Oppenheimer approximation: Ab initio NO+MO/HF theory

    Hiromi Nakai

  • Extension of linear-scaling divide-and-conquer-based correlation method to coupled cluster theory with singles and doubles excitations

    Masato Kobayashi;Hiromi Nakai

  • Energy density analysis with Kohn-Sham orbitals

    Hiromi Nakai

  • Implementation of divide-and-conquer method including Hartree-Fock exchange interaction.

    Tomoko Akama;Masato Kobayashi;Hiromi Nakai

  • Divide-and-conquer-based linear-scaling approach for traditional and renormalized coupled cluster methods with single, double, and noniterative triple excitations

    Masato Kobayashi;Hiromi Nakai

  • Nuclear orbital plus molecular orbital theory: Simultaneous determination of nuclear and electronic wave functions without Born–Oppenheimer approximation

    Hiromi Nakai

  • Electrocatalytic synthesis of ammonia by surface proton hopping

    R. Manabe;H. Nakatsubo;A. Gondo;K. Murakami

  • Time-dependent density functional theory calculations for core-excited states: assessment of standard exchange-correlation functionals and development of a novel hybrid functional.

    Ayako Nakata;Yutaka Imamura;Takao Otsuka;Hiromi Nakai

  • Three pillars for achieving quantum mechanical molecular dynamics simulations of huge systems: Divide-and-conquer, density-functional tight-binding, and massively parallel computation.

    Hiroaki Nishizawa;Yoshifumi Nishimura;Masato Kobayashi;Stephan Irle

  • Non-Fermi liquid behavior in the magnetotransport of CeMIn5 (M: Co and Rh): Striking similarity between quasi 2D heavy fermion and high-Tc cuprates

    Y. Nakajima;H. Shishido;H. Nakai;T. Shibauch

  • Many-body effects in nonadiabatic molecular theory for simultaneous determination of nuclear and electronic wave functions: Ab initio NOMO/MBPT and CC methods

    Hiromi Nakai;Keitaro Sodeyama

  • Local response dispersion method. II. Generalized multicenter interactions

    Takeshi Sato;Hiromi Nakai

  • Molecular orbital study on the reaction process of dimethylamine borane as a reductant for electroless deposition

    Takayuki Homma;Amiko Tamaki;Hiromi Nakai;Tetsuya Osaka

  • Hybrid exchange-correlation functional for core, valence, and Rydberg excitations: core-valence-Rydberg B3LYP.

    Ayako Nakata;Yutaka Imamura;Hiromi Nakai

  • Sodium‐ and Potassium‐Hydrate Melts Containing Asymmetric Imide Anions for High‐Voltage Aqueous Batteries

    Qifeng Zheng;Shota Miura;Kasumi Miyazaki;Seongjae Ko

Frequent Co-Authors

Hiroshi Nakatsuji
Hiroshi Nakatsuji Kyoto University
Masahiko Morinaga
Masahiko Morinaga Toyota Motor Corporation (Japan)
Yusuke Yamauchi
Yusuke Yamauchi University of Queensland
Atsuo Yamada
Atsuo Yamada University of Tokyo
Yuki Yamada
Yuki Yamada University of Tokyo
Tetsuya Osaka
Tetsuya Osaka Waseda University
Chihaya Adachi
Chihaya Adachi Kyushu University
Takanori Fukushima
Takanori Fukushima Tokyo Institute of Technology
Kin-ya Akiba
Kin-ya Akiba Hiroshima University
Feng Wang
Feng Wang Swinburne University of Technology

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