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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 01, 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
4,223
World Rank
43
Country Rank
1
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Photocatalysis | Solar fuel | Advanced oxidation process | Environmental chemistry | Environmental engineerin
Photocatalysis | Solar fuel | Advanced oxidation process | Environmental chemistry | Environmental engineerin
H-Index Metrics
-
H-Index127
-
i10 Index344
-
Citation Counts82,016
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* Total H Index Rankings
Rankings
11,816
World Rank
106
Country Rank
2
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Environmental Sustainable Energy | Chemica
Environmental Sustainable Energy | Chemica
H-Index Metrics
-
H-Index97
-
i10 Index422
-
Citation Counts35,516
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* Total H Index Rankings
Rankings
12,268
World Rank
115
Country Rank
8
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
BioEnergy | Environmental Engineering | Resource Recover
BioEnergy | Environmental Engineering | Resource Recover
H-Index Metrics
-
H-Index96
-
i10 Index499
-
Citation Counts35,125
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* Total H Index Rankings
Rankings
13,872
World Rank
128
Country Rank
32
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
water | desalination | appropriate technology | lithium separatio
water | desalination | appropriate technology | lithium separatio
H-Index Metrics
-
H-Index93
-
i10 Index227
-
Citation Counts30,186
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* Total H Index Rankings
Rankings
16,083
World Rank
152
Country Rank
1
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Bioenergy production | Waste energy conversion | Water-energy-nexus | Environmental Catalys
Environmental Engineering | Bioenergy production | Waste energy conversion | Water-energy-nexus | Environmental Catalys
H-Index Metrics
-
H-Index89
-
i10 Index317
-
Citation Counts24,928
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* Total H Index Rankings
Rankings
30,192
World Rank
319
Country Rank
15
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
Environment | Nuclear Waste Treatment | New and Renewable Energ
Environment | Nuclear Waste Treatment | New and Renewable Energ
H-Index Metrics
-
H-Index74
-
i10 Index197
-
Citation Counts15,800
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* Total H Index Rankings
Rankings
31,342
World Rank
335
Country Rank
4
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Dissolved organic matter | natural organic matte
Dissolved organic matter | natural organic matte
H-Index Metrics
-
H-Index73
-
i10 Index261
-
Citation Counts17,531
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* Total H Index Rankings
Rankings
31,787
World Rank
346
Country Rank
19
University
Ranking Based On Selection:
8
* Total H Index Rankings
Rankings
32,589
World Rank
355
Country Rank
2
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Wastewater treatment | Membrane technologies | Constructed wetland | Anaerobic digestion | Environmenta
Wastewater treatment | Membrane technologies | Constructed wetland | Anaerobic digestion | Environmenta
H-Index Metrics
-
H-Index72
-
i10 Index274
-
Citation Counts19,287
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* Total H Index Rankings
Rankings
34,585
World Rank
387
Country Rank
4
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
membrane separation | water desalination | nanomaterials | hemodialysis | water-energy nexu
membrane separation | water desalination | nanomaterials | hemodialysis | water-energy nexu
H-Index Metrics
-
H-Index71
-
i10 Index253
-
Citation Counts21,088
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* Total H Index Rankings
Rankings
37,890
World Rank
434
Country Rank
36
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
Chemical engineering | Environmental engineering | Heterogeneous catalysis | Hydrogen productio
Chemical engineering | Environmental engineering | Heterogeneous catalysis | Hydrogen productio
H-Index Metrics
-
H-Index69
-
i10 Index216
-
Citation Counts15,652
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* Total H Index Rankings
Rankings
39,363
World Rank
455
Country Rank
25
University
Ranking Based On Selection:
12
Engineering & Technology / Environmental Science & Engineering
Climate | Atmosphere | climate change | El Nino | Climate Dynamic
Climate | Atmosphere | climate change | El Nino | Climate Dynamic
H-Index Metrics
-
H-Index68
-
i10 Index219
-
Citation Counts22,581
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* Total H Index Rankings
Rankings
40,938
World Rank
486
Country Rank
21
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Environmental Chemistry | Environmental Toxicolog
Environmental Chemistry | Environmental Toxicolog
H-Index Metrics
-
H-Index67
-
i10 Index198
-
Citation Counts15,313
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* Total H Index Rankings
Rankings
42,813
World Rank
512
Country Rank
100
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | Water and wastewater treatment | Advanced oxidation process | Water chemistry | Disinfectio
Environmental engineering | Water and wastewater treatment | Advanced oxidation process | Water chemistry | Disinfectio
H-Index Metrics
-
H-Index66
-
i10 Index163
-
Citation Counts15,074
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* Total H Index Rankings
Rankings
43,131
World Rank
517
Country Rank
3
University
Ranking Based On Selection:
15
* Total H Index Rankings
Rankings
44,550
World Rank
541
Country Rank
6
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Waste valorization | Sustainable chemistry | Environmental Engineering | Chemical Engineerin
Waste valorization | Sustainable chemistry | Environmental Engineering | Chemical Engineerin
H-Index Metrics
-
H-Index65
-
i10 Index250
-
Citation Counts18,310
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* Total H Index Rankings
Rankings
45,526
World Rank
559
Country Rank
110
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
climate sciences | atmospheric sciences | environmental science
climate sciences | atmospheric sciences | environmental science
H-Index Metrics
-
H-Index65
-
i10 Index197
-
Citation Counts17,222
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* Total H Index Rankings
Rankings
48,953
World Rank
616
Country Rank
19
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
Environmental nanomaterials | Water and wastewater treatment | Membrane filtratio
Environmental nanomaterials | Water and wastewater treatment | Membrane filtratio
H-Index Metrics
-
H-Index63
-
i10 Index152
-
Citation Counts12,947
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* Total H Index Rankings
Rankings
49,132
World Rank
621
Country Rank
4
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | Water treatment | Nano-technology | Mine reclamatio
Environmental engineering | Water treatment | Nano-technology | Mine reclamatio
H-Index Metrics
-
H-Index63
-
i10 Index186
-
Citation Counts12,813
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* Total H Index Rankings
Rankings
49,957
World Rank
638
Country Rank
7
University
Ranking Based On Selection:
20
* Total H Index Rankings
Rankings
52,696
World Rank
677
Country Rank
8
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
CO2RR | Water Electrolysis | Li-S Battery | Fuel Cells | Scale-up Scienc
CO2RR | Water Electrolysis | Li-S Battery | Fuel Cells | Scale-up Scienc
H-Index Metrics
-
H-Index62
-
i10 Index219
-
Citation Counts13,427
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* Total H Index Rankings
Rankings
56,531
World Rank
731
Country Rank
9
University
Ranking Based On Selection:
22
Engineering & Technology / Environmental Science & Engineering
ecotoxicity | microplastics | nanomaterials | soil toxicity | ecological risk assessmen
ecotoxicity | microplastics | nanomaterials | soil toxicity | ecological risk assessmen
H-Index Metrics
-
H-Index60
-
i10 Index187
-
Citation Counts16,853
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* Total H Index Rankings
Rankings
56,846
World Rank
739
Country Rank
34
University
Ranking Based On Selection:
23
Engineering & Technology / Environmental Science & Engineering
climate science | climate dynamics | statistical climatolog
climate science | climate dynamics | statistical climatolog
H-Index Metrics
-
H-Index60
-
i10 Index154
-
Citation Counts23,953
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* Total H Index Rankings
Rankings
58,995
World Rank
770
Country Rank
5
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
Functional Nanomaterials | Energy and Environmental applications | Wastewater Treatment | Sensor
Functional Nanomaterials | Energy and Environmental applications | Wastewater Treatment | Sensor
H-Index Metrics
-
H-Index59
-
i10 Index164
-
Citation Counts9,712
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* Total H Index Rankings
Rankings
59,072
World Rank
772
Country Rank
22
University
Ranking Based On Selection:
25
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