| Discipline name | D-Index | World Ranking | Current World Ranking | National Ranking | Current National Ranking | Publications | Citations |
|---|---|---|---|---|---|---|---|
| Earth Science | 33 | 8360 | 7756 | 257 | 243 | 140 | 4152 |
The chart shows the history of publications by Akira Usui between 1978 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Akira Usui published across 48 years, from 1978 to 2025, averaging 5.5 papers a year. Output peaked at 22 publications in 2017. 1 of the 266 publications appeared in the last two years.
266 publications in total across all disciplines
| Year | Publications |
|---|---|
| 1978 | 1 |
| 1979 | 2 |
| 1980 | 1 |
| 1981 | 0 |
| 1982 | 2 |
| 1983 | 9 |
| 1984 | 2 |
| 1985 | 4 |
| 1986 | 2 |
| 1987 | 3 |
| 1988 | 4 |
| 1989 | 4 |
| 1990 | 6 |
| 1991 | 3 |
| 1992 | 10 |
| 1993 | 10 |
| 1994 | 14 |
| 1995 | 7 |
| 1996 | 5 |
| 1997 | 8 |
| 1998 | 13 |
| 1999 | 5 |
| 2000 | 11 |
| 2001 | 5 |
| 2002 | 6 |
| 2003 | 1 |
| 2004 | 1 |
| 2005 | 2 |
| 2006 | 1 |
| 2007 | 7 |
| 2008 | 4 |
| 2009 | 6 |
| 2010 | 5 |
| 2011 | 8 |
| 2012 | 3 |
| 2013 | 7 |
| 2014 | 15 |
| 2015 | 13 |
| 2016 | 6 |
| 2017 | 22 |
| 2018 | 7 |
| 2019 | 3 |
| 2020 | 6 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 5 |
| 2024 | 0 |
| 2025 | 1 |
| Total | 266 |
The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Akira Usui sits on this spectrum.
This scientist: 140 publications — 33rd percentile
33% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 603 publications or more.
| Publications | Scientists | This scientist |
|---|---|---|
| 38–47 | 5 | |
| 48–57 | 33 | |
| 58–67 | 94 | |
| 68–77 | 161 | |
| 78–87 | 278 | |
| 88–97 | 376 | |
| 98–107 | 404 | |
| 108–117 | 484 | |
| 118–127 | 540 | |
| 128–137 | 557 | |
| 138–147 | 491 | 140 |
| 148–157 | 495 | |
| 158–167 | 458 | |
| 168–177 | 490 | |
| 178–187 | 414 | |
| 188–197 | 401 | |
| 198–207 | 333 | |
| 208–217 | 292 | |
| 218–227 | 290 | |
| 228–237 | 262 | |
| 238–247 | 243 | |
| 248–257 | 208 | |
| 258–267 | 185 | |
| 268–277 | 147 | |
| 278–287 | 128 | |
| 288–297 | 119 | |
| 298–307 | 120 | |
| 308–317 | 107 | |
| 318–327 | 93 | |
| 328–337 | 87 | |
| 338–347 | 64 | |
| 348–357 | 87 | |
| 358–367 | 60 | |
| 368–377 | 60 | |
| 378–387 | 34 | |
| 388–397 | 50 | |
| 398–407 | 44 | |
| 408–417 | 31 | |
| 418–427 | 39 | |
| 428–437 | 27 | |
| 438–447 | 36 | |
| 448–457 | 27 | |
| 458–467 | 29 | |
| 468–477 | 30 | |
| 478–487 | 19 | |
| 488–497 | 15 | |
| 498–507 | 18 | |
| 508–517 | 19 | |
| 518–527 | 16 | |
| 528–537 | 10 | |
| 538–547 | 11 | |
| 548–557 | 14 | |
| 558–567 | 11 | |
| 568–577 | 7 | |
| 578–587 | 14 | |
| 588–597 | 5 | |
| 598–602 | 4 | |
| 603+ | 100 |
The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Akira Usui sits on this spectrum.
This scientist: 33 D-Index — 11th percentile
11% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 106 D-Index or more.
| D-Index | Scientists | This scientist |
|---|---|---|
| 30 | 144 | |
| 31 | 215 | |
| 32 | 278 | |
| 33 | 379 | 33 |
| 34 | 366 | |
| 35 | 372 | |
| 36 | 389 | |
| 37 | 366 | |
| 38 | 344 | |
| 39 | 349 | |
| 40 | 296 | |
| 41 | 289 | |
| 42 | 277 | |
| 43 | 279 | |
| 44 | 248 | |
| 45 | 257 | |
| 46 | 212 | |
| 47 | 202 | |
| 48 | 207 | |
| 49 | 204 | |
| 50 | 183 | |
| 51 | 178 | |
| 52 | 182 | |
| 53 | 178 | |
| 54 | 163 | |
| 55 | 117 | |
| 56 | 163 | |
| 57 | 120 | |
| 58 | 113 | |
| 59 | 136 | |
| 60 | 135 | |
| 61 | 96 | |
| 62 | 103 | |
| 63 | 83 | |
| 64 | 103 | |
| 65 | 83 | |
| 66 | 89 | |
| 67 | 92 | |
| 68 | 89 | |
| 69 | 78 | |
| 70 | 75 | |
| 71 | 53 | |
| 72 | 62 | |
| 73 | 54 | |
| 74 | 35 | |
| 75 | 52 | |
| 76 | 50 | |
| 77 | 32 | |
| 78 | 37 | |
| 79 | 20 | |
| 80 | 33 | |
| 81 | 36 | |
| 82 | 34 | |
| 83 | 34 | |
| 84 | 24 | |
| 85 | 19 | |
| 86 | 18 | |
| 87 | 26 | |
| 88 | 30 | |
| 89 | 17 | |
| 90 | 21 | |
| 91 | 19 | |
| 92 | 15 | |
| 93 | 14 | |
| 94 | 20 | |
| 95 | 9 | |
| 96 | 10 | |
| 97 | 15 | |
| 98 | 13 | |
| 99 | 3 | |
| 100 | 13 | |
| 101 | 3 | |
| 102 | 9 | |
| 103 | 4 | |
| 104 | 6 | |
| 105 | 6 | |
| 106+ | 98 |
M. Bau;K. Schmidt;A. Koschinsky;J. Hein
Yoshio Takahashi;Alain Manceau;Nicolas Geoffroy;Matthew A. Marcus
Yoshio Takahashi;Hiroshi Shimizu;Akira Usui;Hiroyuki Kagi
Unknown
Teruhiko Kashiwabara;Yoshio Takahashi;Masaharu Tanimizu;Akira Usui
Jouni Ahopelto;A. Atsushi Yamaguchi;Kenichi Nishi;Akira Usui
Teruhiko Kashiwabara;Teruhiko Kashiwabara;Yoshio Takahashi;Matthew A. Marcus;Tomoya Uruga
Unknown
Akira Usui;Keisuke Nishi;Hisaaki Sato;Yoshio Nakasato
Michael Bau;Akira Usui;Bernhard Pracejus;Naoki Mita
Unknown
Kosuke T. Goto;Ariel D. Anbar;Gwyneth W. Gordon;Stephen J. Romaniello
N.-C. Chu;C. M. Johnson;B. L. Beard;C. R. German
Unknown
Kevin W. Mandernack;Kevin W. Mandernack;Marilyn L. Fogel;Bradley M. Tebo;Akira Usui
Hirokuni Oda;Akira Usui;Isoji Miyagi;Masato Joshima
Unknown
Akira Usui;Michael Bau;Yamazaki Toshitsugu
Unknown
Unknown
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