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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 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
10,544
World Rank
3
Country Rank
1
University
Ranking Based On Selection:
1
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
98,079
World Rank
44
Country Rank
4
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Environmental chemistry | persistent organic pollutants | endocrine active chemicals | toxic heavy metals | human exposur
Environmental chemistry | persistent organic pollutants | endocrine active chemicals | toxic heavy metals | human exposur
H-Index Metrics
-
H-Index49
-
i10 Index114
-
Citation Counts9,309
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* Total H Index Rankings
Rankings
182,683
World Rank
116
Country Rank
4
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Quản lý tài nguyên rừng | chính sách lâm nghiệ
Quản lý tài nguyên rừng | chính sách lâm nghiệ
H-Index Metrics
-
H-Index37
-
i10 Index105
-
Citation Counts6,233
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* Total H Index Rankings
Rankings
241,126
World Rank
189
Country Rank
1
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
Environmental Science | Wastewater Treatment Technology | Water Quality Assessment | Climate Chang
Environmental Science | Wastewater Treatment Technology | Water Quality Assessment | Climate Chang
H-Index Metrics
-
H-Index32
-
i10 Index53
-
Citation Counts3,265
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* Total H Index Rankings
Rankings
261,190
World Rank
214
Country Rank
12
University
Ranking Based On Selection:
5
* Total H Index Rankings
Rankings
346,366
World Rank
328
Country Rank
19
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
Regional Climate Modelling and Climate Change | S2S Predictio
Regional Climate Modelling and Climate Change | S2S Predictio
H-Index Metrics
-
H-Index26
-
i10 Index55
-
Citation Counts2,299
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* Total H Index Rankings
Rankings
350,168
World Rank
337
Country Rank
13
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Remote sensing | climate change | mountain and glacier research | Environmental monitorin
Remote sensing | climate change | mountain and glacier research | Environmental monitorin
H-Index Metrics
-
H-Index26
-
i10 Index56
-
Citation Counts2,088
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* Total H Index Rankings
Rankings
366,599
World Rank
364
Country Rank
9
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
environmental science | nanotechnology | air pollution contro
environmental science | nanotechnology | air pollution contro
H-Index Metrics
-
H-Index25
-
i10 Index57
-
Citation Counts1,988
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* Total H Index Rankings
Rankings
366,867
World Rank
365
Country Rank
22
University
Ranking Based On Selection:
9
* Total H Index Rankings
Rankings
368,151
World Rank
369
Country Rank
2
University
Ranking Based On Selection:
10
* Total H Index Rankings
Rankings
392,700
World Rank
404
Country Rank
26
University
Ranking Based On Selection:
11
* Total H Index Rankings
Rankings
393,082
World Rank
406
Country Rank
11
University
Ranking Based On Selection:
12
Engineering & Technology / Environmental Science & Engineering
Environmental hydrology | Environmental modeling | hydro-meteorological extremes | Climate change | Water resources managemen
Environmental hydrology | Environmental modeling | hydro-meteorological extremes | Climate change | Water resources managemen
H-Index Metrics
-
H-Index24
-
i10 Index39
-
Citation Counts2,063
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* Total H Index Rankings
Rankings
400,870
World Rank
421
Country Rank
5
University
Ranking Based On Selection:
13
* Total H Index Rankings
Rankings
414,008
World Rank
429
Country Rank
14
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Environ. Eng. | Photocatalysis | Natural Products | Material Science | Computational Chemistr
Environ. Eng. | Photocatalysis | Natural Products | Material Science | Computational Chemistr
H-Index Metrics
-
H-Index23
-
i10 Index40
-
Citation Counts1,404
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* Total H Index Rankings
Rankings
414,033
World Rank
431
Country Rank
3
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Water Quality Water Treatment Degradation Water and Wastewater Treatment Biocha
Water Quality Water Treatment Degradation Water and Wastewater Treatment Biocha
H-Index Metrics
-
H-Index23
-
i10 Index39
-
Citation Counts2,212
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* Total H Index Rankings
Rankings
441,398
World Rank
482
Country Rank
5
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Circular economy | Wastewater treatment | Membrane separation | Desalination | Renewable energ
Circular economy | Wastewater treatment | Membrane separation | Desalination | Renewable energ
H-Index Metrics
-
H-Index22
-
i10 Index33
-
Citation Counts2,003
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* Total H Index Rankings
Rankings
472,501
World Rank
553
Country Rank
40
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
Photocatalysis | Materials | Environmental Engineerin
Photocatalysis | Materials | Environmental Engineerin
H-Index Metrics
-
H-Index21
-
i10 Index34
-
Citation Counts1,661
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* Total H Index Rankings
Rankings
480,032
World Rank
569
Country Rank
21
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
2D Materials | Hydrogen evolution reaction | Catalysis | Optoelectronic
2D Materials | Hydrogen evolution reaction | Catalysis | Optoelectronic
H-Index Metrics
-
H-Index21
-
i10 Index33
-
Citation Counts1,709
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* Total H Index Rankings
Rankings
486,216
World Rank
581
Country Rank
3
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
Nuclear physics | Applied nuclear physics | material science | environmental scienc
Nuclear physics | Applied nuclear physics | material science | environmental scienc
H-Index Metrics
-
H-Index21
-
i10 Index45
-
Citation Counts1,499
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* Total H Index Rankings
Rankings
494,037
World Rank
596
Country Rank
33
University
Ranking Based On Selection:
20
* Total H Index Rankings
Rankings
516,237
World Rank
655
Country Rank
38
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | wastewater treatment | membrane bioreactor | sludge pretreatment | biogas purificatio
Environmental engineering | wastewater treatment | membrane bioreactor | sludge pretreatment | biogas purificatio
H-Index Metrics
-
H-Index20
-
i10 Index33
-
Citation Counts1,378
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* Total H Index Rankings
Rankings
533,749
World Rank
688
Country Rank
6
University
Ranking Based On Selection:
22
* Total H Index Rankings
Rankings
540,275
World Rank
703
Country Rank
3
University
Ranking Based On Selection:
23
Engineering & Technology / Environmental Science & Engineering
Air quality monitoring/ assessment | Hazardous waste management | Climate chang
Air quality monitoring/ assessment | Hazardous waste management | Climate chang
H-Index Metrics
-
H-Index19
-
i10 Index22
-
Citation Counts1,049
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* Total H Index Rankings
Rankings
553,525
World Rank
736
Country Rank
2
University
Ranking Based On Selection:
24
* Total H Index Rankings
Rankings
571,299
World Rank
769
Country Rank
59
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Water and wastewater treatment and managemnent | waste treatmen
Environmental Engineering | Water and wastewater treatment and managemnent | waste treatmen
H-Index Metrics
-
H-Index18
-
i10 Index22
-
Citation Counts1,313
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