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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Materials Science 73 3753 3631 160 157 780 27154

Koichi Niihara publications per year

The chart shows the history of publications by Koichi Niihara between 1971 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Koichi Niihara published across 55 years, from 1971 to 2025, averaging 14.8 papers a year. Output peaked at 67 publications in 1998. 16 of the 812 publications appeared in the last two years.

No. of publications
20 40 60
Bar chart. Horizontal axis: year, 1971 to 2025. Vertical axis: number of publications, 0 to 67. Peak 67 publications in 1998. 1971: 3 publications 1972: 6 publications 1973: 5 publications 1974: 2 publications 1975: 0 publications 1976: 3 publications 1977: 7 publications 1978: 2 publications 1979: 5 publications 1980: 5 publications 1981: 0 publications 1982: 0 publications 1983: 2 publications 1984: 0 publications 1985: 0 publications 1986: 5 publications 1987: 4 publications 1988: 2 publications 1989: 9 publications 1990: 22 publications 1991: 16 publications 1992: 28 publications 1993: 8 publications 1994: 23 publications 1995: 9 publications 1996: 32 publications 1997: 26 publications 1998: 67 publications 1999: 26 publications 2000: 29 publications 2001: 21 publications 2002: 20 publications 2003: 39 publications 2004: 40 publications 2005: 38 publications 2006: 32 publications 2007: 18 publications 2008: 24 publications 2009: 13 publications 2010: 24 publications 2011: 35 publications 2012: 22 publications 2013: 18 publications 2014: 19 publications 2015: 11 publications 2016: 20 publications 2017: 8 publications 2018: 5 publications 2019: 8 publications 2020: 7 publications 2021: 18 publications 2022: 4 publications 2023: 6 publications 2024: 5 publications 2025: 11 publications
1971 2025

812 publications in total across all disciplines

View publications per year as a table
Koichi Niihara: publications per year, 1971 to 2025
Year Publications
1971 3
1972 6
1973 5
1974 2
1975 0
1976 3
1977 7
1978 2
1979 5
1980 5
1981 0
1982 0
1983 2
1984 0
1985 0
1986 5
1987 4
1988 2
1989 9
1990 22
1991 16
1992 28
1993 8
1994 23
1995 9
1996 32
1997 26
1998 67
1999 26
2000 29
2001 21
2002 20
2003 39
2004 40
2005 38
2006 32
2007 18
2008 24
2009 13
2010 24
2011 35
2012 22
2013 18
2014 19
2015 11
2016 20
2017 8
2018 5
2019 8
2020 7
2021 18
2022 4
2023 6
2024 5
2025 11
Total 812
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Koichi Niihara publications per year - data summary

  • Koichi Niihara, a Materials Science scholar from Nagaoka University of Technology, has 812 publications recorded across 55 years, from 1971 to 2025.
  • The oldest publication on record dates to 1971 and the most recent to 2025.
  • The most productive year is 1998, with 67 publications.
  • The least productive years with any output are 1974, 1978, 1983 and 1988, with 2 publications each.
  • 5 of the 55 years in the span carry no publications at all (1975, 1981, 1982, 1984 and others).
  • The rate of publication averages 14.8 papers per year over the whole span, or 16.2 per year counting only the 50 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 44 publications, 5% of the career total.
  • Split into equal eras - 1971-1989: 60 publications (3.2 per year); 1990-2008: 518 publications (27.3 per year); 2009-2025: 234 publications (13.8 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Koichi Niihara publication distribution in Materials Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Materials Science in 2026. The highlighted bar marks where Koichi Niihara sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 57 bars. Horizontal axis: publications, 50–69 to 1,163+. Vertical axis: number of scientists, 0 to 891. Most scientists, 891, have 190–209 publications. The last bar groups every scientist with 1,163 publications or more. The highlighted bar, 770–789 publications, is where this scientist sits. 50–69 publications: 28 scientists 70–89 publications: 152 scientists 90–109 publications: 356 scientists 110–129 publications: 487 scientists 130–149 publications: 723 scientists 150–169 publications: 835 scientists 170–189 publications: 850 scientists 190–209 publications: 891 scientists 210–229 publications: 862 scientists 230–249 publications: 766 scientists 250–269 publications: 726 scientists 270–289 publications: 665 scientists 290–309 publications: 593 scientists 310–329 publications: 537 scientists 330–349 publications: 477 scientists 350–369 publications: 440 scientists 370–389 publications: 356 scientists 390–409 publications: 321 scientists 410–429 publications: 256 scientists 430–449 publications: 246 scientists 450–469 publications: 216 scientists 470–489 publications: 212 scientists 490–509 publications: 174 scientists 510–529 publications: 194 scientists 530–549 publications: 162 scientists 550–569 publications: 131 scientists 570–589 publications: 111 scientists 590–609 publications: 103 scientists 610–629 publications: 99 scientists 630–649 publications: 77 scientists 650–669 publications: 92 scientists 670–689 publications: 56 scientists 690–709 publications: 53 scientists 710–729 publications: 53 scientists 730–749 publications: 38 scientists 750–769 publications: 52 scientists 770–789 publications: 43 scientists 790–809 publications: 38 scientists 810–829 publications: 34 scientists 830–849 publications: 25 scientists 850–869 publications: 18 scientists 870–889 publications: 20 scientists 890–909 publications: 24 scientists 910–929 publications: 27 scientists 930–949 publications: 20 scientists 950–969 publications: 17 scientists 970–989 publications: 10 scientists 990–1,009 publications: 16 scientists 1,010–1,029 publications: 13 scientists 1,030–1,049 publications: 12 scientists 1,050–1,069 publications: 9 scientists 1,070–1,089 publications: 8 scientists 1,090–1,109 publications: 7 scientists 1,110–1,129 publications: 9 scientists 1,130–1,149 publications: 2 scientists 1,150–1,162 publications: 5 scientists 1,163+ publications: 100 scientists
50–69 publications 1,163+

This scientist: 780 publications — 97th percentile

97% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,163 publications or more.

View publications distribution as a table
Number of Materials Science scientists by publication count, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
Publications Scientists This scientist
50–69 28
70–89 152
90–109 356
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766
250–269 726
270–289 665
290–309 593
310–329 537
330–349 477
350–369 440
370–389 356
390–409 321
410–429 256
430–449 246
450–469 216
470–489 212
490–509 174
510–529 194
530–549 162
550–569 131
570–589 111
590–609 103
610–629 99
630–649 77
650–669 92
670–689 56
690–709 53
710–729 53
730–749 38
750–769 52
770–789 43 780
790–809 38
810–829 34
830–849 25
850–869 18
870–889 20
890–909 24
910–929 27
930–949 20
950–969 17
970–989 10
990–1,009 16
1,010–1,029 13
1,030–1,049 12
1,050–1,069 9
1,070–1,089 8
1,090–1,109 7
1,110–1,129 9
1,130–1,149 2
1,150–1,162 5
1,163+ 100
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Koichi Niihara publication distribution in Materials Science in 2026 - data summary

  • The chart plots the publication count of all 12,847 Materials Science scientists ranked by Research.com in 2026, grouped into 57 ranges running from 50–69 to 1,163+ publications.
  • Koichi Niihara, a Materials Science scholar from Nagaoka University of Technology, records 780 publications - the 97th percentile of the discipline.
  • 97% of ranked Materials Science scientists score the same or lower than Koichi Niihara, and about 3% score higher.
  • The median of the discipline falls in the 250–269 publications range, and Koichi Niihara ranks above the median.
  • The most crowded range is 190–209 publications, holding 891 scientists (7% of the field).
  • 70% of the field sits in the lowest quarter of the value range (up to 330–349 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 1,163 publications or more, 100 scientists in all (<1% of the field).

Koichi Niihara D-index placement in Materials Science in 2026

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

No. of scientists
200 400 600
Bar chart with 64 bars. Horizontal axis: D-Index, 40–41 to 165+. Vertical axis: number of scientists, 0 to 667. Most scientists, 667, have 52–53 D-Index. The last bar groups every scientist with 165 D-Index or more. The highlighted bar, 72–73 D-Index, is where this scientist sits. 40–41 D-Index: 211 scientists 42–43 D-Index: 450 scientists 44–45 D-Index: 612 scientists 46–47 D-Index: 612 scientists 48–49 D-Index: 598 scientists 50–51 D-Index: 657 scientists 52–53 D-Index: 667 scientists 54–55 D-Index: 621 scientists 56–57 D-Index: 597 scientists 58–59 D-Index: 610 scientists 60–61 D-Index: 587 scientists 62–63 D-Index: 606 scientists 64–65 D-Index: 533 scientists 66–67 D-Index: 490 scientists 68–69 D-Index: 469 scientists 70–71 D-Index: 378 scientists 72–73 D-Index: 421 scientists 74–75 D-Index: 359 scientists 76–77 D-Index: 323 scientists 78–79 D-Index: 299 scientists 80–81 D-Index: 230 scientists 82–83 D-Index: 210 scientists 84–85 D-Index: 195 scientists 86–87 D-Index: 203 scientists 88–89 D-Index: 175 scientists 90–91 D-Index: 175 scientists 92–93 D-Index: 142 scientists 94–95 D-Index: 121 scientists 96–97 D-Index: 117 scientists 98–99 D-Index: 107 scientists 100–101 D-Index: 88 scientists 102–103 D-Index: 85 scientists 104–105 D-Index: 68 scientists 106–107 D-Index: 62 scientists 108–109 D-Index: 57 scientists 110–111 D-Index: 45 scientists 112–113 D-Index: 49 scientists 114–115 D-Index: 50 scientists 116–117 D-Index: 34 scientists 118–119 D-Index: 38 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 28 scientists 126–127 D-Index: 24 scientists 128–129 D-Index: 33 scientists 130–131 D-Index: 28 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 20 scientists 136–137 D-Index: 23 scientists 138–139 D-Index: 17 scientists 140–141 D-Index: 12 scientists 142–143 D-Index: 17 scientists 144–145 D-Index: 21 scientists 146–147 D-Index: 13 scientists 148–149 D-Index: 11 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 13 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 4 scientists 162–163 D-Index: 4 scientists 164 D-Index: 3 scientists 165+ D-Index: 98 scientists
40–41 D-Index 165+

This scientist: 73 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 165 D-Index or more.

View D-Index distribution as a table
Number of Materials Science scientists by D-index, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
D-Index Scientists This scientist
40–41 211
42–43 450
44–45 612
46–47 612
48–49 598
50–51 657
52–53 667
54–55 621
56–57 597
58–59 610
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378
72–73 421 73
74–75 359
76–77 323
78–79 299
80–81 230
82–83 210
84–85 195
86–87 203
88–89 175
90–91 175
92–93 142
94–95 121
96–97 117
98–99 107
100–101 88
102–103 85
104–105 68
106–107 62
108–109 57
110–111 45
112–113 49
114–115 50
116–117 34
118–119 38
120–121 37
122–123 29
124–125 28
126–127 24
128–129 33
130–131 28
132–133 21
134–135 20
136–137 23
138–139 17
140–141 12
142–143 17
144–145 21
146–147 13
148–149 11
150–151 14
152–153 13
154–155 9
156–157 10
158–159 7
160–161 4
162–163 4
164 3
165+ 98
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Koichi Niihara D-index placement in Materials Science in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 12,847 Materials Science scientists ranked by Research.com in 2026, grouped into 64 ranges running from 40–41 to 165+ D-Index.
  • Koichi Niihara, a Materials Science scholar from Nagaoka University of Technology, records 73 D-Index - the 71st percentile of the discipline.
  • 71% of ranked Materials Science scientists score the same or lower than Koichi Niihara, and about 29% score higher.
  • The median of the discipline falls in the 62–63 D-Index range, and Koichi Niihara ranks above the median.
  • The most crowded range is 52–53 D-Index, holding 667 scientists (5% of the field).
  • 68% of the field sits in the lowest quarter of the value range (up to 70–71 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 165 D-Index or more, 98 scientists in all (<1% of the field).

Overview

Koichi Niihara is affiliated with Nagaoka University of Technology in Japan and has contributed extensively to the fields of engineering and materials science. Their research encompasses multiple subfields including materials chemistry, civil and structural engineering, mechanical engineering, ceramics, composites, and biomedical engineering.

The scientist's work covers a variety of main topics such as advanced ceramic materials synthesis, advanced materials and composites, dielectric materials and actuators, vibration control and rheological fluids, concrete and cement materials research, transition metal oxide nanomaterials, and ferroelectric and piezoelectric materials.

Koichi Niihara has published frequently in several journals, with notable repeated publication venues including:

  • Journal of the American Ceramic Society
  • Ceramics International
  • Journal of the Ceramic Society of Japan
  • SSRN Electronic Journal
  • International Journal of Applied Ceramic Technology

The scientist's collaborative network includes multiple frequent co-authors such as Tadachika Nakayama, Hisayuki Suematsu, Thi Mai Dung, Ayahisa Okawa, and Son Thanh Nguyen.

Representative recent papers authored or co-authored by Koichi Niihara include:

  • Self-healing ability, strength enhancement, and high-temperature oxidation behavior of silicon carbide-dispersed ytterbium disilicate composite for environmental barrier coatings under isothermal heat treatment, 2022, Journal of the European Ceramic Society
  • Improving self-healing ability and flexural strength of ytterbium silicate-based nanocomposites with silicon carbide nanoparticulates and whiskers, 2021, Journal of the Ceramic Society of Japan
  • Autonomous crack healing ability of SiC dispersed Yb2Si2O7 by oxidations in air and water vapor, 2021, Ceramics International
  • Synthesis of β-MoO 3 whiskers by the thermal evaporation method with flowing oxygen gas, 2021, Journal of the American Ceramic Society
  • Enhancing low-temperature energy harvesting by lead-free ferroelectric Ba(Zr 0.1 Ti 0.9 )O 3, 2022, Journal of the American Ceramic Society

Best Publications

  • Formation of titanium oxide nanotube

    Tomoko Kasuga;Masayoshi Hiramatsu;Akihiko Hoson;Toru Sekino

  • Titania Nanotubes Prepared by Chemical Processing

    Tomoko Kasuga;Masayoshi Hiramatsu;Akihiko Hoson;Tohru Sekino

  • New design concept of structural ceramics―ceramic nanocomposites

    Koichi Niihara

  • A fracture mechanics analysis of indentation-induced Palmqvist crack in ceramics

    Unknown

  • Sintering Behaviors and Consolidation Process for Al2O3/SiC Nanocomposites

    Atsushi Nakahira;Koichi Niihara

  • A superplastic covalent crystal composite

    F. Wakai;Y. Kodama;S. Sakaguchi;N. Murayama

  • Reduction and Sintering of a Nickel–Dispersed‐Alumina Composite and Its Properties

    Tohru Sekino;Toshio Nakajima;Satoru Ueda;Koichi Niihara

  • Strengthening and Toughening Mechanisms of Ceramic Nanocomposites

    Tatsuki Ohji;Young-Keun Jeong;Yong-Ho Choa;Koichi Niihara

  • Wetting and interface microstructure between Sn–Zn binary alloys and Cu

    Katsuaki Suganuma;Koichi Niihara;Takeshi Shoutoku;Yoshikazu Nakamura

  • Synthesis, atomic structures and properties of carbon and boron nitride fullerene materials

    Takeo Oku;Takanori Hirano;Masaki Kuno;Takafumi Kusunose

  • Mechanical property improvement of carbon fiber reinforced epoxy composites by Al2O3 filler dispersion

    Manwar Hussain;Atsushi Nakahira;Koichi Niihara

  • Synthesis and Characterization of Photoconducting Polyaniline-TiO2 Nanocomposite

    Wei Feng;Enhai Sun;Akihiko Fujii;Hongcai Wu

  • Characterization of nanocrystalline CoCrFeNiTiAl high-entropy solid solution processed by mechanical alloying

    K.B. Zhang;Z.Y. Fu;J.Y. Zhang;W.M. Wang

  • Dense Hydroxyapatite–Zirconia Ceramic Composites with High Strength for Biological Applications

    Z. J. Shen;E. Adolfsson;M. Nygren;L. Gao

  • Tough and strong Ce-TZP/Alumina nanocomposites doped with titania

    Masahiro Nawa;Syoichi Nakamoto;Tohru Sekino;Koichi Niihara

  • The Effect of Stoichiometry on Mechanical Properties of Boron Carbide

    Koichi Niihara;Atsushi Nakahira;Toshio Hirai

  • Fabrication and mechanical behaviour of Al2O3/Mo nanocomposites

    M. Nawa;T. Sekino;K. Niihara

  • Microstructural Evolution and Mechanical Properties of Si3N4 with Yb2O3 as a Sintering Additive

    Hyoungjoon Park;Hyoun-Ee Kim;Koichi Niihara

  • Fabrication and mechanical properties of 5 vol% copper dispersed alumina nanocomposite

    Sung Tag Oh;Tohru Sekino;Koichi Niihara

  • Fabrication process and electrical behavior of novel pressure-sensitive composites

    Manwar Hussain;Yong-Ho Choa;Koichi Niihara

  • Mechanical and Electrical Properties of Silicon Nitride–Silicon Carbide Nanocomposite Material

    Akihiro Sawaguchi;Kohji Toda;Koichi Niihara

Frequent Co-Authors

Tohru Sekino
Tohru Sekino Osaka University
Weihua Jiang
Weihua Jiang Nagaoka University of Technology
Jianfeng Yang
Jianfeng Yang Xi'an Jiaotong University
Zhengyi Fu
Zhengyi Fu Wuhan University of Technology
Katsuaki Suganuma
Katsuaki Suganuma Osaka University
Tatsuki Ohji
Tatsuki Ohji National Institute of Advanced Industrial Science and Technology
Toshio Hirai
Toshio Hirai Tohoku University
Isao Tanaka
Isao Tanaka Kyoto University
Lian Gao
Lian Gao Shanghai Jiao Tong University
Masashi Yoshimura
Masashi Yoshimura Osaka University

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