World Scientist and University Rankings 2025
Japan Engineering & Technology 369 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Mar 02, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (941.641) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Biological wastewater treatment
Biofilm
Anaerobic digestion
Anammox
MBR
Metrics
H-Index
i10 Index
Citation Counts
86
450
29,440
* Total H IndexRankings
Ranking Based On Selection: 2
Urban Analytics
Urban Policy
Sustainable Operations
Climate Change Economics
Wellbeing
Metrics
H-Index
i10 Index
Citation Counts
84
413
32,525
* Total H IndexRankings
Ranking Based On Selection: 3
Climate
climate modelling
ice sheet dynamics
paleoclimatology
pale oceanography
Metrics
H-Index
i10 Index
Citation Counts
80
222
22,553
* Total H IndexRankings
Ranking Based On Selection: 4
Climate Change
Monsoon
Metrics
H-Index
i10 Index
Citation Counts
80
200
38,041
* Total H IndexRankings
Ranking Based On Selection: 5
Climate change
Integrated Assessment Models
Energy modeling
Metrics
H-Index
i10 Index
Citation Counts
76
189
30,126
* Total H IndexRankings
Ranking Based On Selection: 6
Plant-microbe interactions
rhizobial ecology
genome evolution
Metrics
H-Index
i10 Index
Citation Counts
61
175
12,999
* Total H IndexRankings
Ranking Based On Selection: 7
oceanography
biogeochemistry
geochemistry
carbon cycle
climate change
Metrics
H-Index
i10 Index
Citation Counts
60
152
22,003
* Total H IndexRankings
Ranking Based On Selection: 8
Environmental Science
Metrics
H-Index
i10 Index
Citation Counts
59
152
10,770
* Total H IndexRankings
Ranking Based On Selection: 9
Metrics
H-Index
i10 Index
Citation Counts
58
148
10,183
* Total H IndexRankings
Ranking Based On Selection: 10
Waste and wastewater treatment
biogasification
nutrients removal and recovery
heavy metals
Metrics
H-Index
i10 Index
Citation Counts
56
215
11,661
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* Total H IndexRankings
Ranking Based On Selection: 11
climate change
biogeochemistry
inverse modeling
data assimilation
remote sensing
Metrics
H-Index
i10 Index
Citation Counts
55
176
16,137
* Total H IndexRankings
Ranking Based On Selection: 12
Environmental Toxicology
Chemical Pollution
Environmental Chemistry
Ecotoxicology
Aquatic Toxicology
Metrics
H-Index
i10 Index
Citation Counts
55
184
12,460
* Total H IndexRankings
Ranking Based On Selection: 13
Environmental Virology
Wastewater-based Epidemiology
Metrics
H-Index
i10 Index
Citation Counts
54
114
13,262
* Total H IndexRankings
Ranking Based On Selection: 14
Building Enviromental Engineering
Metrics
H-Index
i10 Index
Citation Counts
54
241
11,623
* Total H IndexRankings
Ranking Based On Selection: 15
Fuel Cells
Electrolyzers
Sensors
Batteries
Metrics
H-Index
i10 Index
Citation Counts
54
152
10,186
* Total H IndexRankings
Ranking Based On Selection: 16
Climate Science
Metrics
H-Index
i10 Index
Citation Counts
53
133
13,664
* Total H IndexRankings
Ranking Based On Selection: 17
environmental studies
Metrics
H-Index
i10 Index
Citation Counts
51
146
13,278
* Total H IndexRankings
Ranking Based On Selection: 18
Metrics
H-Index
i10 Index
Citation Counts
51
115
7,800
* Total H IndexRankings
Ranking Based On Selection: 19
eDNA Research
Freshwater Ecology
Ecology of Infectious Diseases
Animal Physiology
Metrics
H-Index
i10 Index
Citation Counts
50
118
11,809
* Total H IndexRankings
Ranking Based On Selection: 20
GIScience
spatial analysis
health geographies
crime epidemiology
Metrics
H-Index
i10 Index
Citation Counts
49
149
9,103
* Total H IndexRankings
Ranking Based On Selection: 21
Water
hydrology
floods
droughts
environmental flows
Metrics
H-Index
i10 Index
Citation Counts
49
118
13,748
* Total H IndexRankings
Ranking Based On Selection: 22
Nitrification inhibition
Biological nitrification inhibition
nitrous oxide emissions
global warming
climate change
Metrics
H-Index
i10 Index
Citation Counts
49
85
9,694
* Total H IndexRankings
Ranking Based On Selection: 23
Environmental Sciences
Mineralogy
Geochemistry
Metrics
H-Index
i10 Index
Citation Counts
49
113
9,543
* Total H IndexRankings
Ranking Based On Selection: 24
Environmental Science
Remote Sensing
GIS
REDD+
Sustainability Science
Metrics
H-Index
i10 Index
Citation Counts
48
144
8,620
* Total H IndexRankings
Ranking Based On Selection: 25
wastewater treatment
stirred tank
photocatalyst
zero-valent iron
Fenton process
Metrics
H-Index
i10 Index
Citation Counts
48
151
8,045
李玉友|李 玉友, Gyokuyu RI
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
86
450
29,440
Biological wastewater treatment
Biofilm
Anaerobic digestion
Anammox
MBR
Shunsuke Managi
Kyushu University
Fukuoka, Japan
Metrics
H-Index
i10-Index
Citation Counts
84
413
32,525
Urban Analytics
Urban Policy
Sustainable Operations
Climate Change Economics
Wellbeing
Ayako Abe Ouchi
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
80
222
22,553
Climate
climate modelling
ice sheet dynamics
paleoclimatology
pale oceanography
Akio Kitoh
Japan Meteorological Agency
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
80
200
38,041
Climate Change
Monsoon
Shinichiro Fujimori
Kyoto University
Kyoto, Japan
Metrics
H-Index
i10-Index
Citation Counts
76
189
30,126
Climate change
Integrated Assessment Models
Energy modeling
Kiwamu Minamisawa
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
61
175
12,999
Plant-microbe interactions
rhizobial ecology
genome evolution
Yukihiro Nojiri
Hirosaki University
Hirosaki, Japan
Metrics
H-Index
i10-Index
Citation Counts
60
152
22,003
oceanography
biogeochemistry
geochemistry
carbon cycle
climate change
Shigeki Masunaga
Yokohama National University
Yokohama, Japan
Metrics
H-Index
i10-Index
Citation Counts
59
152
10,770
Environmental Science
Zhongfang Lei
University of Tsukuba
Tsukuba, Japan
Metrics
H-Index
i10-Index
Citation Counts
56
215
11,661
Waste and wastewater treatment
biogasification
nutrients removal and recovery
heavy metals
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Shamil Maksyutov
Metrics
H-Index
i10-Index
Citation Counts
55
176
16,137
climate change
biogeochemistry
inverse modeling
data assimilation
remote sensing
Hisato Iwata
Ehime University
Matsuyama, Japan
Metrics
H-Index
i10-Index
Citation Counts
55
184
12,460
Environmental Toxicology
Chemical Pollution
Environmental Chemistry
Ecotoxicology
Aquatic Toxicology
Masaaki Kitajima
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
54
114
13,262
Environmental Virology
Wastewater-based Epidemiology
Shinsuke Kato
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
54
241
11,623
Building Enviromental Engineering
Takashi Hibino
Nagoya University
Nagoya, Japan
Metrics
H-Index
i10-Index
Citation Counts
54
152
10,186
Fuel Cells
Electrolyzers
Sensors
Batteries
Hideo Shiogama
Metrics
H-Index
i10-Index
Citation Counts
53
133
13,664
Takashi Kunito
Shinshu University
Matsumoto, Japan
Metrics
H-Index
i10-Index
Citation Counts
51
115
7,800
Toshifumi Minamoto
Kobe University
Kobe, Japan
Metrics
H-Index
i10-Index
Citation Counts
50
118
11,809
eDNA Research
Freshwater Ecology
Ecology of Infectious Diseases
Animal Physiology
Tomoki Nakaya
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
49
149
9,103
GIScience
spatial analysis
health geographies
crime epidemiology
Vladimir Smakhtin
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
49
118
13,748
Water
hydrology
floods
droughts
environmental flows
Subbarao Guntur
Metrics
H-Index
i10-Index
Citation Counts
49
85
9,694
Nitrification inhibition
Biological nitrification inhibition
nitrous oxide emissions
global warming
climate change
Satoshi Utsunomiya
Kyushu University
Fukuoka, Japan
Metrics
H-Index
i10-Index
Citation Counts
49
113
9,543
Environmental Sciences
Mineralogy
Geochemistry
Environmental Science
Remote Sensing
GIS
REDD+
Sustainability Science
Yoshinori Kawase
Toyo University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
48
151
8,045
wastewater treatment
stirred tank
photocatalyst
zero-valent iron
Fenton process