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World Scientist and University Rankings 2026
Japan Engineering & Technology / Environmental Science & Engineering 366 Scientists Subject Rankings
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 211 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 5 years. As of Jan 03, 2026, 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 (1.131.752) 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 Index Rankings
Rankings
14,281
World Rank
185
Country Rank
10
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Biological wastewater treatment | Biofilm | Anaerobic digestion | Anammox | MB
Biological wastewater treatment | Biofilm | Anaerobic digestion | Anammox | MB
H-Index Metrics
-
H-Index92
-
i10 Index509
-
Citation Counts33,850
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* Total H Index Rankings
Rankings
14,851
World Rank
200
Country Rank
7
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Urban Analytics | Urban Policy | Sustainable Operations | Climate Change Economics | Wellbein
Urban Analytics | Urban Policy | Sustainable Operations | Climate Change Economics | Wellbein
H-Index Metrics
-
H-Index91
-
i10 Index452
-
Citation Counts38,664
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* Total H Index Rankings
Rankings
19,903
World Rank
292
Country Rank
28
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Climate | climate modelling | ice sheet dynamics | paleoclimatology | pale oceanograph
Climate | climate modelling | ice sheet dynamics | paleoclimatology | pale oceanograph
H-Index Metrics
-
H-Index84
-
i10 Index245
-
Citation Counts25,585
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* Total H Index Rankings
Rankings
21,933
World Rank
329
Country Rank
1
University
Ranking Based On Selection:
4
* Total H Index Rankings
Rankings
22,346
World Rank
339
Country Rank
30
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
Climate change | Integrated Assessment Models | Energy modelin
Climate change | Integrated Assessment Models | Energy modelin
H-Index Metrics
-
H-Index81
-
i10 Index202
-
Citation Counts36,600
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* Total H Index Rankings
Rankings
46,824
World Rank
784
Country Rank
12
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
Waste and wastewater treatment | biogasification | nutrients removal and recovery | heavy metal
Waste and wastewater treatment | biogasification | nutrients removal and recovery | heavy metal
H-Index Metrics
-
H-Index64
-
i10 Index236
-
Citation Counts13,751
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* Total H Index Rankings
Rankings
50,384
World Rank
854
Country Rank
48
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Plant-microbe interactions | rhizobial ecology | genome evolutio
Plant-microbe interactions | rhizobial ecology | genome evolutio
H-Index Metrics
-
H-Index63
-
i10 Index182
-
Citation Counts13,909
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* Total H Index Rankings
Rankings
53,312
World Rank
935
Country Rank
2
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
oceanography | biogeochemistry | geochemistry | carbon cycle | climate chang
oceanography | biogeochemistry | geochemistry | carbon cycle | climate chang
H-Index Metrics
-
H-Index62
-
i10 Index159
-
Citation Counts23,237
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* Total H Index Rankings
Rankings
58,053
World Rank
1,047
Country Rank
5
University
Ranking Based On Selection:
9
* Total H Index Rankings
Rankings
60,847
World Rank
1,111
Country Rank
8
University
Ranking Based On Selection:
10
* Total H Index Rankings
Rankings
62,846
World Rank
1,145
Country Rank
4
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
climate change | biogeochemistry | inverse modeling | data assimilation | remote sensin
climate change | biogeochemistry | inverse modeling | data assimilation | remote sensin
H-Index Metrics
-
H-Index58
-
i10 Index189
-
Citation Counts18,964
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* Total H Index Rankings
Rankings
65,446
World Rank
1,199
Country Rank
5
University
Ranking Based On Selection:
12
* Total H Index Rankings
Rankings
65,459
World Rank
1,200
Country Rank
39
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Environmental Virology | Wastewater-based Epidemiolog
Environmental Virology | Wastewater-based Epidemiolog
H-Index Metrics
-
H-Index57
-
i10 Index123
-
Citation Counts14,830
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* Total H Index Rankings
Rankings
70,510
World Rank
1,286
Country Rank
78
University
Ranking Based On Selection:
14
* Total H Index Rankings
Rankings
71,148
World Rank
1,312
Country Rank
8
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Environmental Toxicology | Chemical Pollution | Environmental Chemistry | Ecotoxicology | Aquatic Toxicolog
Environmental Toxicology | Chemical Pollution | Environmental Chemistry | Ecotoxicology | Aquatic Toxicolog
H-Index Metrics
-
H-Index56
-
i10 Index190
-
Citation Counts13,040
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* Total H Index Rankings
Rankings
71,466
World Rank
1,323
Country Rank
44
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Environmental Science | Remote Sensing | GIS | REDD+ | Sustainability Scienc
Environmental Science | Remote Sensing | GIS | REDD+ | Sustainability Scienc
H-Index Metrics
-
H-Index55
-
i10 Index158
-
Citation Counts11,174
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* Total H Index Rankings
Rankings
74,841
World Rank
1,400
Country Rank
68
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
Fuel Cells | Electrolyzers | Sensors | Batterie
Fuel Cells | Electrolyzers | Sensors | Batterie
H-Index Metrics
-
H-Index55
-
i10 Index154
-
Citation Counts10,551
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* Total H Index Rankings
Rankings
75,229
World Rank
1,406
Country Rank
25
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
eDNA Research | Freshwater Ecology | Ecology of Infectious Diseases | Animal Physiolog
eDNA Research | Freshwater Ecology | Ecology of Infectious Diseases | Animal Physiolog
H-Index Metrics
-
H-Index54
-
i10 Index129
-
Citation Counts14,107
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* Total H Index Rankings
Rankings
76,767
World Rank
1,422
Country Rank
1
University
Ranking Based On Selection:
19
* Total H Index Rankings
Rankings
79,543
World Rank
1,491
Country Rank
82
University
Ranking Based On Selection:
20
Engineering & Technology / Environmental Science & Engineering
GIScience | spatial analysis | health geography | crime geography | spatial epidemiolog
GIScience | spatial analysis | health geography | crime geography | spatial epidemiolog
H-Index Metrics
-
H-Index53
-
i10 Index169
-
Citation Counts10,358
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* Total H Index Rankings
Rankings
84,085
World Rank
1,587
Country Rank
4
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
Water | hydrology | floods | droughts | environmental flow
Water | hydrology | floods | droughts | environmental flow
H-Index Metrics
-
H-Index52
-
i10 Index125
-
Citation Counts15,432
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* Total H Index Rankings
Rankings
90,270
World Rank
1,737
Country Rank
58
University
Ranking Based On Selection:
22
Engineering & Technology / Environmental Science & Engineering
Environmental Sciences | Mineralogy | Geochemistr
Environmental Sciences | Mineralogy | Geochemistr
H-Index Metrics
-
H-Index51
-
i10 Index113
-
Citation Counts10,441
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* Total H Index Rankings
Rankings
90,987
World Rank
1,761
Country Rank
8
University
Ranking Based On Selection:
23
* Total H Index Rankings
Rankings
93,731
World Rank
1,812
Country Rank
9
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
Nitrification inhibition | Biological nitrification inhibition | nitrous oxide emissions | global warming | climate chang
Nitrification inhibition | Biological nitrification inhibition | nitrous oxide emissions | global warming | climate chang
H-Index Metrics
-
H-Index50
-
i10 Index89
-
Citation Counts10,707
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* Total H Index Rankings
Rankings
100,388
World Rank
1,980
Country Rank
2
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
wastewater treatment | stirred tank | photocatalyst | zero-valent iron | Fenton proces
wastewater treatment | stirred tank | photocatalyst | zero-valent iron | Fenton proces
H-Index Metrics
-
H-Index49
-
i10 Index152
-
Citation Counts8,326
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Premium Data
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