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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 53 13106 11791 990 902 226 9684

Koji Ohta publications per year

The chart shows the history of publications by Koji Ohta between 1968 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Koji Ohta published across 59 years, from 1968 to 2026, averaging 4.4 papers a year. Output peaked at 17 publications in 2003. 2 of the 258 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1968 to 2026. Vertical axis: number of publications, 0 to 17. Peak 17 publications in 2003. 1968: 1 publication 1969: 0 publications 1970: 2 publications 1971: 0 publications 1972: 1 publication 1973: 0 publications 1974: 1 publication 1975: 3 publications 1976: 3 publications 1977: 7 publications 1978: 8 publications 1979: 6 publications 1980: 1 publication 1981: 5 publications 1982: 0 publications 1983: 0 publications 1984: 1 publication 1985: 5 publications 1986: 1 publication 1987: 0 publications 1988: 2 publications 1989: 3 publications 1990: 2 publications 1991: 1 publication 1992: 3 publications 1993: 1 publication 1994: 1 publication 1995: 1 publication 1996: 11 publications 1997: 10 publications 1998: 7 publications 1999: 6 publications 2000: 15 publications 2001: 12 publications 2002: 10 publications 2003: 17 publications 2004: 9 publications 2005: 7 publications 2006: 10 publications 2007: 14 publications 2008: 11 publications 2009: 12 publications 2010: 10 publications 2011: 11 publications 2012: 9 publications 2013: 7 publications 2014: 2 publications 2015: 2 publications 2016: 3 publications 2017: 1 publication 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 1 publication 2022: 0 publications 2023: 0 publications 2024: 0 publications 2025: 1 publication 2026: 1 publication
1968 2026

258 publications in total across all disciplines

View publications per year as a table
Koji Ohta: publications per year, 1968 to 2026
Year Publications
1968 1
1969 0
1970 2
1971 0
1972 1
1973 0
1974 1
1975 3
1976 3
1977 7
1978 8
1979 6
1980 1
1981 5
1982 0
1983 0
1984 1
1985 5
1986 1
1987 0
1988 2
1989 3
1990 2
1991 1
1992 3
1993 1
1994 1
1995 1
1996 11
1997 10
1998 7
1999 6
2000 15
2001 12
2002 10
2003 17
2004 9
2005 7
2006 10
2007 14
2008 11
2009 12
2010 10
2011 11
2012 9
2013 7
2014 2
2015 2
2016 3
2017 1
2018 0
2019 0
2020 0
2021 1
2022 0
2023 0
2024 0
2025 1
2026 1
Total 258
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Koji Ohta 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 Koji Ohta 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, 221–240 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: 226 publications — 42nd percentile

42% 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 1,216 226
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
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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Koji Ohta 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 Koji Ohta 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, 52–53 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: 53 D-Index — 28th percentile

28% 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 53
54–55 933
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

Koji Ohta is affiliated with the National Institute of Advanced Industrial Science and Technology in Japan. The research work of this scientist spans multiple disciplines, primarily focusing on engineering and medicine, with notable contributions in surgery, electrical and electronic engineering, biomedical engineering, and polymers and plastics.

The main research topics addressed by Ohta encompass spinal fractures and fixation techniques, hip and femur fractures, medical imaging and analysis, advancements in battery materials, semiconductor materials and devices, and transition metal oxide nanomaterials.

Ohta's recent publications include the following:

  • Evaluating the effect of early balloon kyphoplasty on adjacent vertebral fracture risk in osteoporotic vertebral fracture management: a retrospective study (2025, Asian Spine Journal)
  • Fabrication and Characterization of LiMn2O4 Thin Films for Flexible Thin Film Lithium-ion Batteries: Effect of thermal Annealing (2021, International Journal of Engineering and Applied Sciences (IJEAS))

The scientist has collaborated frequently with several co-authors, including:

  • Masatoshi Yamamoto
  • Daisuke Hirano
  • M Noguchi
  • Shuhei Ayukawa
  • Keigo Shirasaki

Ohta's work has been published in venues such as the Asian Spine Journal and the International Journal of Engineering and Applied Sciences (IJEAS), reflecting the interdisciplinary nature of their research combining clinical medical studies with engineering investigations.

Best Publications

  • Optically active poly(triphenylmethyl methacrylate) with one-handed helical conformation

    Yoshio Okamoto;Koichi Suzuki;Koji Ohta;Koichi Hatada

  • Spectroscopic studies of nile red in organic solvents and polymers

    Ashim Kumar Dutta;Kenji Kamada;Koji Ohta

  • Second Hyperpolarizability (γ) of Singlet Diradical System: Dependence of γ on the Diradical Character

    Masayoshi Nakano;Ryohei Kishi;Tomoshige Nitta;Takashi Kubo

  • Comparison Among Several Numerical Integration Methods for Kramers-Kronig Transformation

    Koji Ohta;Hatsuo Ishida

  • Strong two-photon absorption of singlet diradical hydrocarbons.

    Kenji Kamada;Koji Ohta;Takashi Kubo;Akihiro Shimizu

  • Relationship between third-order nonlinear optical properties and magnetic interactions in open-shell systems: a new paradigm for nonlinear optics.

    Masayoshi Nakano;Ryohei Kishi;Suguru Ohta;Hideaki Takahashi

  • Strong two-photon absorption of self-assembled butadiyne-linked bisporphyrin

    Kazuya Ogawa;Atsushi Ohashi;Yoshiaki Kobuke;Kenji Kamada

  • Two-photon absorption properties of symmetric substituted diacetylene: drastic enhancement of the cross section near the one-photon absorption peak

    Kenji Kamada;Koji Ohta;Yoichiro Iwase;Koichi Kondo

  • Singlet Diradical Character from Experiment

    Kenji Kamada;Koji Ohta;Akihiro Shimizu;Takashi Kubo

  • Matrix formalism for calculation of electric field intensity of light in stratified multilayered films

    Koji Ohta;Hatsuo Ishida

  • Second hyperpolarizabilities of polycyclic aromatic hydrocarbons involving phenalenyl radical units

    Masayoshi Nakano;Takashi Kubo;Kenji Kamada;Koji Ohta

  • A systematic femtosecond study on the two-photon absorbing D-π-A molecules–π-bridge nitrogen insertion and strength of the donor and acceptor groups

    Liudmil Antonov;Kenji Kamada;Koji Ohta;Fadhil S. Kamounah

  • Molecular Design for Organic Nonlinear Optics: Polarizability and Hyperpolarizabilities of Furan Homologues Investigated by Ab Initio Molecular Orbital Method†

    Kenji Kamada;Minoru Ueda;Hidemi Nagao;Keiko Tawa

  • Impact of diradical character on two-photon absorption: bis(acridine) dimers synthesized from an allenic precursor.

    Kenji Kamada;Shin-ichi Fuku-en;Shu Minamide;Shu Minamide;Koji Ohta

  • Two-photon-absorption-induced accumulated thermal effect on femtosecond Z-scan experiments studied with time-resolved thermal-lens spectrometry and its simulation

    Kenji Kamada;Kinu Matsunaga;Akihiro Yoshino;Koji Ohta

  • Synthesis and photophysical properties of new two-photon absorption chromophores containing a diacetylene moiety as the central π-bridge

    Yoichiro Iwase;Kenji Kamada;Koji Ohta;Koichi Kondo

  • Two-photon absorption properties of self-assemblies of butadiyne-linked bis(imidazolylporphyrin).

    Kazuya Ogawa;Atsushi Ohashi;Yoshiaki Kobuke;Kenji Kamada

  • Giant Enhancement of the Second Hyperpolarizabilities of Open-Shell Singlet Polyaromatic Diphenalenyl Diradicaloids by an External Electric Field and Donor–Acceptor Substitution

    Masayoshi Nakano;Takuya Minami;Kyohei Yoneda;Shabbir Muhammad

  • Erratum to: (Hyper)polarizability density analysis for open-shell molecular systems based on natural orbitals and occupation numbers

    Masayoshi Nakano;Hitoshi Fukui;Takuya Minami;Kyohei Yoneda

  • Second Hyperpolarizabilities (γ) of Bisimidazole and Bistriazole Benzenes: Diradical Character, Charged State, and Spin State Dependences

    Masayoshi Nakano;Ryohei Kishi;Nozomi Nakagawa;Suguru Ohta

  • (Hyper)polarizability density analysis for open-shell molecular systems based on natural orbitals and occupation numbers

    Unknown

Frequent Co-Authors

Kenji Kamada
Kenji Kamada National Institute of Advanced Industrial Science and Technology
Masayoshi Nakano
Masayoshi Nakano Osaka University
Takashi Kubo
Takashi Kubo Osaka University
Benoît Champagne
Benoît Champagne University of Namur
Kizashi Yamaguchi
Kizashi Yamaguchi Osaka University
Kazuhiro Nakasuji
Kazuhiro Nakasuji Osaka University
Yasushi Morita
Yasushi Morita Aichi Institute of Technology
Yoshio Okamoto
Yoshio Okamoto Nagoya University
Akihiro Shimizu
Akihiro Shimizu Osaka University
Yoshiaki Kobuke
Yoshiaki Kobuke Nara Institute of Science and Technology

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