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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 02, 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
31,146
World Rank
101
Country Rank
1
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Bioprocess Engineering | Biotechnology | Environmental Engineerin
Bioprocess Engineering | Biotechnology | Environmental Engineerin
H-Index Metrics
-
H-Index74
-
i10 Index192
-
Citation Counts19,652
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* Total H Index Rankings
Rankings
65,089
World Rank
217
Country Rank
9
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Membrane Processes | Water Reuse | Water Treatment | Wastewater Treatmen
Membrane Processes | Water Reuse | Water Treatment | Wastewater Treatmen
H-Index Metrics
-
H-Index57
-
i10 Index204
-
Citation Counts11,562
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* Total H Index Rankings
Rankings
84,700
World Rank
308
Country Rank
6
University
Ranking Based On Selection:
3
* Total H Index Rankings
Rankings
95,082
World Rank
379
Country Rank
6
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
Air Pollution | persistent organic pollutant
Air Pollution | persistent organic pollutant
H-Index Metrics
-
H-Index50
-
i10 Index82
-
Citation Counts7,510
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* Total H Index Rankings
Rankings
97,597
World Rank
397
Country Rank
3
University
Ranking Based On Selection:
5
* Total H Index Rankings
Rankings
99,806
World Rank
414
Country Rank
6
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
Membrane Processes | water and wastewater recovery | biotechnolog
Membrane Processes | water and wastewater recovery | biotechnolog
H-Index Metrics
-
H-Index49
-
i10 Index117
-
Citation Counts7,697
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* Total H Index Rankings
Rankings
100,012
World Rank
416
Country Rank
16
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
çevre kimyası | kimyasal arıtma prosesleri | ileri oksidasyon prosesleri | ozonlama | su ve atıksu arıtım
çevre kimyası | kimyasal arıtma prosesleri | ileri oksidasyon prosesleri | ozonlama | su ve atıksu arıtım
H-Index Metrics
-
H-Index49
-
i10 Index119
-
Citation Counts9,421
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* Total H Index Rankings
Rankings
100,346
World Rank
419
Country Rank
5
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
membrane processes | water/wastewater treatment | reuse | clean production | DBP
membrane processes | water/wastewater treatment | reuse | clean production | DBP
H-Index Metrics
-
H-Index49
-
i10 Index74
-
Citation Counts8,085
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* Total H Index Rankings
Rankings
115,511
World Rank
527
Country Rank
1
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Environmental science and technology | nanoremediation | Water pollution control | Advanced treatmen
Environmental science and technology | nanoremediation | Water pollution control | Advanced treatmen
H-Index Metrics
-
H-Index46
-
i10 Index92
-
Citation Counts11,271
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* Total H Index Rankings
Rankings
144,954
World Rank
768
Country Rank
15
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
anaerobik aerobik arıtma | ekotoksikoloji | toksik kirleticiler | endüstri atıks
anaerobik aerobik arıtma | ekotoksikoloji | toksik kirleticiler | endüstri atıks
H-Index Metrics
-
H-Index42
-
i10 Index83
-
Citation Counts6,164
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* Total H Index Rankings
Rankings
151,914
World Rank
831
Country Rank
36
University
Ranking Based On Selection:
11
* Total H Index Rankings
Rankings
180,334
World Rank
1,112
Country Rank
49
University
Ranking Based On Selection:
12
* Total H Index Rankings
Rankings
189,361
World Rank
1,196
Country Rank
43
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Biotechnology | Activated Sludge Modeling | Industrial Pollution Control | Reuse-Recover
Environmental Engineering | Biotechnology | Activated Sludge Modeling | Industrial Pollution Control | Reuse-Recover
H-Index Metrics
-
H-Index37
-
i10 Index105
-
Citation Counts5,035
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* Total H Index Rankings
Rankings
191,123
World Rank
1,219
Country Rank
25
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Water Treatment | Wastewater Treatment | Environmental Biotechnology | Adsorption Processes | Effects of Hazardous Substances on Bi
Water Treatment | Wastewater Treatment | Environmental Biotechnology | Adsorption Processes | Effects of Hazardous Substances on Bi
H-Index Metrics
-
H-Index37
-
i10 Index57
-
Citation Counts4,141
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* Total H Index Rankings
Rankings
198,323
World Rank
1,294
Country Rank
50
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Water and water treatment | Water chemistry | Industrial Waste Managemen
Environmental Engineering | Water and water treatment | Water chemistry | Industrial Waste Managemen
H-Index Metrics
-
H-Index36
-
i10 Index72
-
Citation Counts4,600
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* Total H Index Rankings
Rankings
199,810
World Rank
1,310
Country Rank
37
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Environmental biotechnology | bioenergy | green chemistr
Environmental biotechnology | bioenergy | green chemistr
H-Index Metrics
-
H-Index36
-
i10 Index58
-
Citation Counts5,353
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* Total H Index Rankings
Rankings
211,467
World Rank
1,462
Country Rank
54
University
Ranking Based On Selection:
17
* Total H Index Rankings
Rankings
211,984
World Rank
1,475
Country Rank
9
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
environmental engineering | air pollution and control | atmospheric deposition | exchange processe
environmental engineering | air pollution and control | atmospheric deposition | exchange processe
H-Index Metrics
-
H-Index35
-
i10 Index81
-
Citation Counts4,175
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* Total H Index Rankings
Rankings
212,807
World Rank
1,489
Country Rank
63
University
Ranking Based On Selection:
19
* Total H Index Rankings
Rankings
216,797
World Rank
1,529
Country Rank
55
University
Ranking Based On Selection:
20
Engineering & Technology / Environmental Science & Engineering
wastewater treatment | anaerobic biotechnology | membrane technology | anaerobic membrane bioreactor | dynamic membran
wastewater treatment | anaerobic biotechnology | membrane technology | anaerobic membrane bioreactor | dynamic membran
H-Index Metrics
-
H-Index34
-
i10 Index66
-
Citation Counts4,781
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* Total H Index Rankings
Rankings
221,306
World Rank
1,579
Country Rank
38
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
Environmental Biotechnology | Resource Recover
Environmental Biotechnology | Resource Recover
H-Index Metrics
-
H-Index34
-
i10 Index58
-
Citation Counts3,590
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* Total H Index Rankings
Rankings
233,055
World Rank
1,725
Country Rank
37
University
Ranking Based On Selection:
22
Engineering & Technology / Environmental Science & Engineering
atmospheric pollution | aerosol | remote sensin
atmospheric pollution | aerosol | remote sensin
H-Index Metrics
-
H-Index33
-
i10 Index52
-
Citation Counts3,588
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* Total H Index Rankings
Rankings
234,195
World Rank
1,735
Country Rank
19
University
Ranking Based On Selection:
23
* Total H Index Rankings
Rankings
249,252
World Rank
1,951
Country Rank
20
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
indoor air quality | environmental exposure and risk assessmen
indoor air quality | environmental exposure and risk assessmen
H-Index Metrics
-
H-Index32
-
i10 Index52
-
Citation Counts3,505
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* Total H Index Rankings
Rankings
249,478
World Rank
1,954
Country Rank
40
University
Ranking Based On Selection:
25
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