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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Environmental Sciences 64 2270 2165 91 87 208 99880

Ken Takahashi publications per year

The chart shows the history of publications by Ken Takahashi between 1976 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ken Takahashi published across 50 years, from 1976 to 2025, averaging 7.6 papers a year. Output peaked at 51 publications in 2023. 16 of the 380 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1976 to 2025. Vertical axis: number of publications, 0 to 51. Peak 51 publications in 2023. 1976: 1 publication 1977: 2 publications 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 1 publication 1987: 0 publications 1988: 1 publication 1989: 1 publication 1990: 5 publications 1991: 2 publications 1992: 2 publications 1993: 6 publications 1994: 5 publications 1995: 4 publications 1996: 6 publications 1997: 5 publications 1998: 4 publications 1999: 9 publications 2000: 3 publications 2001: 6 publications 2002: 4 publications 2003: 7 publications 2004: 2 publications 2005: 6 publications 2006: 15 publications 2007: 10 publications 2008: 11 publications 2009: 8 publications 2010: 9 publications 2011: 11 publications 2012: 11 publications 2013: 8 publications 2014: 16 publications 2015: 16 publications 2016: 21 publications 2017: 15 publications 2018: 23 publications 2019: 16 publications 2020: 12 publications 2021: 10 publications 2022: 19 publications 2023: 51 publications 2024: 9 publications 2025: 7 publications
1976 2025

380 publications in total across all disciplines

View publications per year as a table
Ken Takahashi: publications per year, 1976 to 2025
Year Publications
1976 1
1977 2
1978 0
1979 0
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 1
1987 0
1988 1
1989 1
1990 5
1991 2
1992 2
1993 6
1994 5
1995 4
1996 6
1997 5
1998 4
1999 9
2000 3
2001 6
2002 4
2003 7
2004 2
2005 6
2006 15
2007 10
2008 11
2009 8
2010 9
2011 11
2012 11
2013 8
2014 16
2015 16
2016 21
2017 15
2018 23
2019 16
2020 12
2021 10
2022 19
2023 51
2024 9
2025 7
Total 380
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Ken Takahashi publications per year - data summary

  • Ken Takahashi, a Environmental Sciences scholar from University of Sydney, has 380 publications recorded across 50 years, from 1976 to 2025.
  • The oldest publication on record dates to 1976 and the most recent to 2025.
  • The most productive year is 2023, with 51 publications.
  • The least productive years with any output are 1976, 1986, 1988 and 1989, with 1 publication each.
  • 9 of the 50 years in the span carry no publications at all (1978, 1979, 1980, 1981 and others).
  • The rate of publication averages 7.6 papers per year over the whole span, or 9.3 per year counting only the 41 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 96 publications, 25% of the career total.
  • Split into equal eras - 1976-1992: 15 publications (0.9 per year); 1993-2009: 111 publications (6.5 per year); 2010-2025: 254 publications (15.9 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Ken Takahashi publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Ken Takahashi sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 66 bars. Horizontal axis: publications, 41–50 to 690+. Vertical axis: number of scientists, 0 to 617. Most scientists, 617, have 121–130 publications. The last bar groups every scientist with 690 publications or more. The highlighted bar, 201–210 publications, is where this scientist sits. 41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41–50 publications 690+

This scientist: 208 publications — 67th percentile

67% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

View publications distribution as a table
Number of Environmental Sciences scientists by publication count, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
Publications Scientists This scientist
41–50 21
51–60 62
61–70 133
71–80 257
81–90 361
91–100 440
101–110 492
111–120 541
121–130 617
131–140 544
141–150 541
151–160 539
161–170 444
171–180 444
181–190 400
191–200 377
201–210 318 208
211–220 282
221–230 263
231–240 220
241–250 217
251–260 180
261–270 181
271–280 155
281–290 130
291–300 127
301–310 130
311–320 85
321–330 106
331–340 80
341–350 83
351–360 75
361–370 69
371–380 52
381–390 54
391–400 56
401–410 44
411–420 40
421–430 36
431–440 25
441–450 25
451–460 32
461–470 29
471–480 21
481–490 26
491–500 26
501–510 17
511–520 19
521–530 15
531–540 22
541–550 12
551–560 15
561–570 11
571–580 19
581–590 9
591–600 9
601–610 7
611–620 11
621–630 5
631–640 5
641–650 6
651–660 3
661–670 3
671–680 4
681–689 4
690+ 100
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Ken Takahashi publication distribution in Environmental Sciences in 2026 - data summary

  • The chart plots the publication count of all 9,676 Environmental Sciences scientists ranked by Research.com in 2026, grouped into 66 ranges running from 41–50 to 690+ publications.
  • Ken Takahashi, a Environmental Sciences scholar from University of Sydney, records 208 publications - the 67th percentile of the discipline.
  • 67% of ranked Environmental Sciences scientists score the same or lower than Ken Takahashi, and about 33% score higher.
  • The median of the discipline falls in the 161–170 publications range, and Ken Takahashi ranks above the median.
  • The most crowded range is 121–130 publications, holding 617 scientists (6% of the field).
  • 67% of the field sits in the lowest quarter of the value range (up to 201–210 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 690 publications or more, 100 scientists in all (1% of the field).

Ken Takahashi D-index placement in Environmental Sciences in 2026

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

No. of scientists
100 200 300
Bar chart with 97 bars. Horizontal axis: D-Index, 30 to 126+. Vertical axis: number of scientists, 0 to 348. Most scientists, 348, have 45 D-Index. The last bar groups every scientist with 126 D-Index or more. The highlighted bar, 64 D-Index, is where this scientist sits. 30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 64 D-Index — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

View D-Index distribution as a table
Number of Environmental Sciences scientists by D-index, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
D-Index Scientists This scientist
30 12
31 26
32 51
33 88
34 123
35 163
36 206
37 267
38 265
39 275
40 321
41 343
42 305
43 336
44 330
45 348
46 291
47 275
48 272
49 273
50 263
51 232
52 266
53 217
54 198
55 177
56 202
57 204
58 166
59 177
60 166
61 152
62 143
63 150
64 124 64
65 119
66 120
67 118
68 82
69 98
70 94
71 105
72 74
73 84
74 70
75 67
76 78
77 60
78 59
79 52
80 47
81 38
82 48
83 42
84 42
85 43
86 29
87 37
88 29
89 30
90 34
91 20
92 22
93 17
94 19
95 24
96 21
97 20
98 24
99 17
100 17
101 21
102 25
103 18
104 26
105 20
106 15
107 10
108 13
109 15
110 12
111 8
112 7
113 9
114 6
115 12
116 7
117 8
118 3
119 5
120 7
121 2
122 4
123 8
124 7
125 9
126+ 92
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Ken Takahashi D-index placement in Environmental Sciences in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,676 Environmental Sciences scientists ranked by Research.com in 2026, grouped into 97 ranges running from 30 to 126+ D-Index.
  • Ken Takahashi, a Environmental Sciences scholar from University of Sydney, records 64 D-Index - the 77th percentile of the discipline.
  • 77% of ranked Environmental Sciences scientists score the same or lower than Ken Takahashi, and about 23% score higher.
  • The median of the discipline falls in the 51 D-Index range, and Ken Takahashi ranks above the median.
  • The most crowded range is 45 D-Index, holding 348 scientists (4% of the field).
  • 59% of the field sits in the lowest quarter of the value range (up to 54 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 126 D-Index or more, 92 scientists in all (<1% of the field).

Overview

Ken Takahashi is affiliated with the University of Sydney in Australia and has contributed extensively to the field of medicine, with a focus on multiple subfields including pulmonary and respiratory medicine, hepatology, surgery, molecular biology, and oncology. Their research spans 124 publications primarily grounded in medicine.

The scientist's work frequently appears in several notable academic venues. These include Cancers, Journal of Gastroenterology, Scientific Reports, BMC Public Health, and the International Journal of Environmental Research and Public Health. Takahashi's publication record reflects a strong engagement with research communities in these journals.

Ken Takahashi's research addresses a range of topics, such as:

  • Occupational and environmental lung diseases
  • Hepatocellular carcinoma treatment and prognosis
  • Air quality and health impacts
  • Prenatal screening and diagnostics
  • Immunotherapy and immune responses
  • Pancreatic and hepatic oncology research
  • Interstitial lung diseases and idiopathic pulmonary fibrosis

Some of the recent published papers include:

  • Recent Advances in Immunotherapy for Hepatocellular Carcinoma, 2020, Cancers
  • Pretreatment Neutrophil-to-Lymphocyte Ratio as a Predictive Marker of Response to Atezolizumab Plus Bevacizumab for Hepatocellular Carcinoma, 2021, Current Oncology
  • Artificial intelligence (AI) models for the ultrasonographic diagnosis of liver tumors and comparison of diagnostic accuracies between AI and human experts, 2022, Journal of Gastroenterology
  • Mongolia health situation: based on the Global Burden of Disease Study 2019, 2022, BMC Public Health
  • Global trends and gaps in research related to latent tuberculosis infection, 2020, BMC Public Health

The scientist has collaborated with multiple coauthors on various research projects. The most frequent collaborators include Hiroshi Seno, Yuji Eso, Atsushi Takai, Haruhiko Takeda, and Masako Mishima. These partnerships represent repeated scholarly cooperation across different studies and areas within medical research.

Best Publications

  • Global burden of 369 diseases and injuries in 204 countries and territories, 1990–2019: a systematic analysis for the Global Burden of Disease Study 2019

    Theo Vos;Theo Vos;Theo Vos;Stephen S. Lim;Cristiana Abbafati;Cristiana Abbafati;Cristiana Abbafati;Kaja M. Abbas;Kaja M. Abbas;Kaja M. Abbas

  • Global, regional, and national age-sex-specific mortality for 282 causes of death in 195 countries and territories, 1980-2017: a systematic analysis for the Global Burden of Disease Study 2017

    Gregory A Roth;Gregory A Roth;Degu Abate;Kalkidan Hassen Abate;Solomon M Abay

  • Global burden of 87 risk factors in 204 countries and territories, 1990–2019: a systematic analysis for the Global Burden of Disease Study 2019

    Christopher J.L. Murray;Christopher J.L. Murray;Christopher J.L. Murray;Aleksandr Y. Aravkin;Aleksandr Y. Aravkin;Aleksandr Y. Aravkin;Peng Zheng;Peng Zheng;Peng Zheng;Cristiana Abbafati;Cristiana Abbafati;Cristiana Abbafati

  • Global, regional, and national comparative risk assessment of 79 behavioural, environmental and occupational, and metabolic risks or clusters of risks in 188 countries, 1990-2013: A systematic analysis for the Global Burden of Disease Study 2013

    Mohammad H Forouzanfar;Lily Alexander;H Ross Anderson;Victoria F Bachman

  • Global, regional, and national incidence, prevalence, and years lived with disability for 301 acute and chronic diseases and injuries in 188 countries, 1990-2013: a systematic analysis for the Global Burden of Disease Study 2013

    Theo Vos;Ryan M. Barber;Brad Bell;Amelia Bertozzi-Villa

  • Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980–2015: a systematic analysis for the Global Burden of Disease Study 2015

    Haidong Wang;Mohsen Naghavi;Christine Allen;Ryan M Barber

  • Global, regional, and national cancer incidence, mortality, years of life lost, years lived with disability, and disability-adjusted life-years for 29 cancer groups, 1990 to 2017

    Christina Fitzmaurice;Degu Abate;Naghmeh Abbasi;Hedayat Abbastabar

  • Global, regional, and national comparative risk assessment of 84 behavioural, environmental and occupational, and metabolic risks or clusters of risks for 195 countries and territories, 1990–2017 : a systematic analysis for the Global Burden of Disease Study 2017

    Jeffrey D. Stanaway;Ashkan Afshin;Emmanuela Gakidou;Stephen S. Lim

  • Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016

    Mohsen Naghavi;Amanuel Alemu Abajobir;Cristiana Abbafati;Kaja M Abbas

  • Global, regional, and national comparative risk assessment of 79 behavioural, environmental and occupational, and metabolic risks or clusters of risks in 188 countries, 1990-2013

    Mohammad H. Forouzanfar;Lily Alexander;H. Ross Anderson;Victoria F. Bachman

  • Global, regional, and national comparative risk assessment of 84 behavioural, environmental and occupational, and metabolic risks or clusters of risks, 1990–2016: a systematic analysis for the Global Burden of Disease Study 2016

    Amanuel Alemu Abajobir;Kalkidan Hassen Abate;Cristiana Abbafati;Kaja M. Abbas

  • Global, regional, and national disability-adjusted life years (DALYs) for 306 diseases and injuries and healthy life expectancy (HALE) for 188 countries, 1990-2013 : quantifying the epidemiological transition

    Christopher J. L. Murray;Ryan M. Barber;Kyle J. Foreman;Ayse Abbasoglu Ozgoren

  • El Niño–Southern Oscillation complexity

    Axel Timmermann;Axel Timmermann;Soon Il An;Jong Seong Kug;Fei Fei Jin

  • Global, regional, and national age-sex-specific mortality and life expectancy, 1950-2017: a systematic analysis for the Global Burden of Disease Study 2017

    Daniel Dicker;Grant Nguyen;Degu Abate;Kalkidan Hassen Abate

  • ENSO and greenhouse warming

    Wenju Cai;Wenju Cai;Agus Santoso;Guojian Wang;Sang Wook Yeh

  • Increased frequency of extreme La Niña events under greenhouse warming

    Wenju Cai;Wenju Cai;Guojian Wang;Guojian Wang;Agus Santoso;Michael J. Mcphaden

  • ENSO regimes: Reinterpreting the canonical and Modoki El Niño

    Ken Takahashi;A. Montecinos;Katerina Goubanova;Boris Dewitte

  • Climate impacts of the El Niño–Southern Oscillation on South America

    Wenju Cai;Wenju Cai;Michael J. McPhaden;Alice M. Grimm;Regina R. Rodrigues

  • Record-breaking warming and extreme drought in the Amazon rainforest during the course of El Niño 2015–2016

    Juan C. Jiménez-Muñoz;Cristian Mattar;Jonathan Barichivich;Andrés Santamaría-Artigas

  • Increased variability of eastern Pacific El Niño under greenhouse warming

    Wenju Cai;Guojian Wang;Guojian Wang;Boris Dewitte;Lixin Wu

  • Probing the Fast and Slow Components of Global Warming by Returning Abruptly to Preindustrial Forcing

    Isaac M. Held;Michael Winton;Ken Takahashi;Thomas Delworth

  • Decreased Serum Free Testosterone in Workers Exposed to High Levels of Di-n-butyl Phthalate (DBP) and Di-2-ethylhexyl Phthalate (DEHP): A Cross-Sectional Study in China

    Guowei Pan;Tomoyuki Hanaoka;Mariko Yoshimura;Shujuan Zhang

  • Observing and Predicting the 2015/16 El Niño

    Michelle L. L’Heureux;Ken Takahashi;Andrew B. Watkins;Anthony G. Barnston

  • STATE OF THE CLIMATE IN 2017

    R. Abernethy;Steven A. Ackerman;R. Adler;Adelina Albanil Encarnación

Frequent Co-Authors

Maziar Moradi-Lakeh
Maziar Moradi-Lakeh Iran University of Medical Sciences
Ted R. Miller
Ted R. Miller Pacific Institute
Theo Vos
Theo Vos Institute for Health Metrics and Evaluation
Christopher J L Murray
Christopher J L Murray University of Washington
Bach Xuan Tran
Bach Xuan Tran Vietnam National University, Hanoi
Boris Dewitte
Boris Dewitte Center for Advanced Studies in Arid Zones (CEAZA)
Ali H. Mokdad
Ali H. Mokdad University of Washington
Alan D. Lopez
Alan D. Lopez University of Melbourne
Francesco S. Violante
Francesco S. Violante University of Bologna
Foad Abd-Allah
Foad Abd-Allah Cairo University

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