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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
8,153
World Rank
13
Country Rank
1
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Pyrolysis | Microwave Pyrolysis | Waste and Biomass Recovery | Water & Wastewater Treatment | Biocha
Pyrolysis | Microwave Pyrolysis | Waste and Biomass Recovery | Water & Wastewater Treatment | Biocha
H-Index Metrics
-
H-Index107
-
i10 Index474
-
Citation Counts38,724
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* Total H Index Rankings
Rankings
8,821
World Rank
67
Country Rank
26
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Environmental microbiology and biotechnology | MBR | Biological wastewater treatmen
Environmental microbiology and biotechnology | MBR | Biological wastewater treatmen
H-Index Metrics
-
H-Index105
-
i10 Index335
-
Citation Counts41,854
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* Total H Index Rankings
Rankings
10,542
World Rank
3
Country Rank
1
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Hydrogen | Catalysis | Reforming | Photocatalysis | Fischer-Tropsch synthesi
Hydrogen | Catalysis | Reforming | Photocatalysis | Fischer-Tropsch synthesi
H-Index Metrics
-
H-Index100
-
i10 Index422
-
Citation Counts35,729
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* Total H Index Rankings
Rankings
10,660
World Rank
80
Country Rank
33
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | water | reuse | solid waste | recyclin
Environmental engineering | water | reuse | solid waste | recyclin
H-Index Metrics
-
H-Index100
-
i10 Index295
-
Citation Counts43,235
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* Total H Index Rankings
Rankings
12,253
World Rank
17
Country Rank
2
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
Droughts | Climate Change | Statistical hydrology | Groundwater hydrology | Hydrologica
Droughts | Climate Change | Statistical hydrology | Groundwater hydrology | Hydrologica
H-Index Metrics
-
H-Index96
-
i10 Index382
-
Citation Counts28,748
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* Total H Index Rankings
Rankings
14,929
World Rank
20
Country Rank
3
University
Ranking Based On Selection:
6
* Total H Index Rankings
Rankings
18,315
World Rank
142
Country Rank
48
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Environmental Science | Chemical Engineering | Nanomaterial
Environmental Engineering | Environmental Science | Chemical Engineering | Nanomaterial
H-Index Metrics
-
H-Index86
-
i10 Index200
-
Citation Counts26,548
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* Total H Index Rankings
Rankings
23,313
World Rank
181
Country Rank
95
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
Cardiovascular diseases | Air pollution | Meta-analysi
Cardiovascular diseases | Air pollution | Meta-analysi
H-Index Metrics
-
H-Index80
-
i10 Index208
-
Citation Counts31,499
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* Total H Index Rankings
Rankings
24,263
World Rank
51
Country Rank
10
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Water Resources | Optimization Model | Dam Operation | Artificial Neural networ
Water Resources | Optimization Model | Dam Operation | Artificial Neural networ
H-Index Metrics
-
H-Index79
-
i10 Index336
-
Citation Counts22,895
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* Total H Index Rankings
Rankings
26,239
World Rank
60
Country Rank
3
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
Bioprocessing | Biorefinery | Food processing | Microalgae technology | Sustainabilit
Bioprocessing | Biorefinery | Food processing | Microalgae technology | Sustainabilit
H-Index Metrics
-
H-Index77
-
i10 Index199
-
Citation Counts21,739
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* Total H Index Rankings
Rankings
28,572
World Rank
66
Country Rank
1
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
Biopolymers | Composite Biomaterials | Activated Carbon | Adsorption | Response Surface Methodolog
Biopolymers | Composite Biomaterials | Activated Carbon | Adsorption | Response Surface Methodolog
H-Index Metrics
-
H-Index75
-
i10 Index183
-
Citation Counts14,288
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* Total H Index Rankings
Rankings
32,578
World Rank
74
Country Rank
3
University
Ranking Based On Selection:
12
* Total H Index Rankings
Rankings
33,366
World Rank
247
Country Rank
79
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
wastewater treatment | recreational water quality | public health | environmental microbiology | biofilm
wastewater treatment | recreational water quality | public health | environmental microbiology | biofilm
H-Index Metrics
-
H-Index72
-
i10 Index170
-
Citation Counts18,249
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* Total H Index Rankings
Rankings
36,342
World Rank
271
Country Rank
90
University
Ranking Based On Selection:
14
* Total H Index Rankings
Rankings
36,712
World Rank
273
Country Rank
91
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Membrane Separation | Environmental Nanotechnology | Water and Desalination | Environmental Material
Environmental Engineering | Membrane Separation | Environmental Nanotechnology | Water and Desalination | Environmental Material
H-Index Metrics
-
H-Index70
-
i10 Index178
-
Citation Counts18,098
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* Total H Index Rankings
Rankings
44,627
World Rank
116
Country Rank
9
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Waste and wastewater treatment | Phytoremediation | Waste Audit and Management | Waste Recovery and Mini
Environmental Engineering | Waste and wastewater treatment | Phytoremediation | Waste Audit and Management | Waste Recovery and Mini
H-Index Metrics
-
H-Index65
-
i10 Index287
-
Citation Counts17,746
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* Total H Index Rankings
Rankings
45,954
World Rank
347
Country Rank
186
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
Water and Wastewater Treatment | Water Reuse | Membrane Technology | Green Infrastructur
Water and Wastewater Treatment | Water Reuse | Membrane Technology | Green Infrastructur
H-Index Metrics
-
H-Index65
-
i10 Index154
-
Citation Counts12,516
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* Total H Index Rankings
Rankings
46,697
World Rank
123
Country Rank
1
University
Ranking Based On Selection:
18
* Total H Index Rankings
Rankings
48,929
World Rank
366
Country Rank
122
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
Water and Wastewater Treatment | Waste Treatmen
Water and Wastewater Treatment | Waste Treatmen
H-Index Metrics
-
H-Index63
-
i10 Index181
-
Citation Counts13,588
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* Total H Index Rankings
Rankings
50,266
World Rank
51
Country Rank
1
University
Ranking Based On Selection:
20
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | membrane technology | solid waste managmen
Environmental Engineering | membrane technology | solid waste managmen
H-Index Metrics
-
H-Index63
-
i10 Index188
-
Citation Counts13,561
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* Total H Index Rankings
Rankings
57,310
World Rank
171
Country Rank
24
University
Ranking Based On Selection:
21
* Total H Index Rankings
Rankings
64,821
World Rank
201
Country Rank
18
University
Ranking Based On Selection:
22
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Waste to Energy | Bioenergy | Emission Control | Methane Ga
Environmental Engineering | Waste to Energy | Bioenergy | Emission Control | Methane Ga
H-Index Metrics
-
H-Index57
-
i10 Index180
-
Citation Counts10,840
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* Total H Index Rankings
Rankings
68,927
World Rank
75
Country Rank
7
University
Ranking Based On Selection:
23
Engineering & Technology / Environmental Science & Engineering
Environmental governance | climate change adaptation | sustainability science | knowledge systems | narrative
Environmental governance | climate change adaptation | sustainability science | knowledge systems | narrative
H-Index Metrics
-
H-Index56
-
i10 Index162
-
Citation Counts25,015
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* Total H Index Rankings
Rankings
70,289
World Rank
511
Country Rank
271
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
Environment | Optimization | Applied Mat
Environment | Optimization | Applied Mat
H-Index Metrics
-
H-Index56
-
i10 Index138
-
Citation Counts12,252
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* Total H Index Rankings
Rankings
71,922
World Rank
236
Country Rank
1
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
Microbial degradation | Fungal metabolism | Persistent organic pollutant | Pollutant transformatio
Microbial degradation | Fungal metabolism | Persistent organic pollutant | Pollutant transformatio
H-Index Metrics
-
H-Index55
-
i10 Index175
-
Citation Counts10,419
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