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 Dec 30, 2025, 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 (1.131.699) 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].
Rankings
Reaction Engineering & Catalysis | Air Pollution and Waste Water Control Engineering | Fuel Technology | Nanoscience & Nanotechno
H-Index Metrics
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H-Index120
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i10 Index558
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Citation Counts56,467
Rankings
2D Materials | Photocatalysis | Green hydrogen | Energy storage | CO2 conversio
H-Index Metrics
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H-Index86
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i10 Index286
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Citation Counts21,932
Rankings
Heterogeneous Catalysts | Biodiesel | Nano-magnetic Catalysts | Bio-based Catalyst
H-Index Metrics
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H-Index84
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i10 Index338
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Citation Counts24,189
Rankings
Chemical engineering | fuel cell | hydrogen energy | drying technology | food technology
H-Index Metrics
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H-Index82
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i10 Index292
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Citation Counts26,701
Rankings
Chemical reaction | renewable energy | environmental engineering | oleochemical engineerin
H-Index Metrics
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H-Index76
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i10 Index218
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Citation Counts21,220
Rankings
Process System Engineering | Modelling and Process Optimization | Direct Methanol fuel cell | Fuel cell technolog
H-Index Metrics
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H-Index74
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i10 Index226
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Citation Counts23,188
Rankings
Renewable energy | biomass | biodiesel | bioethanol | microalga
H-Index Metrics
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H-Index71
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i10 Index167
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Citation Counts17,662
Rankings
Rankings
Biomass energy | catalysis | gasification | adsorption | environmen
H-Index Metrics
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H-Index67
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i10 Index167
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Citation Counts14,593
Rankings
Microalgae Technology | Food Waste | Biochemical Engineering | Biomass Conversio
H-Index Metrics
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H-Index67
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i10 Index217
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Citation Counts16,069
Rankings
REE detection | H2S conversion | Ionic Liquids | Metal Organic Framework(MOF) | Electrochemistr
H-Index Metrics
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H-Index65
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i10 Index230
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Citation Counts12,148
Rankings
Rankings
Oils and Fats Processing | Lipids extraction | Lipid analyses | Biofuel | Emulsion
H-Index Metrics
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H-Index60
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i10 Index140
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Citation Counts12,707
Rankings
Rankings
Rankings
Rankings
Rankings
Ionic liquids | environment | Composite & Biomaterial
H-Index Metrics
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H-Index56
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i10 Index180
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Citation Counts11,460
Rankings
Reaction Engineering | Heterogeneous catalysis | Wastewater treatment | Microbial fuel cell | CO2 reductio
H-Index Metrics
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H-Index54
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i10 Index182
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Citation Counts8,836
Rankings
Rankings
Rankings
Materials Chemistry | Environmental Chemistry | Waste to Resource
H-Index Metrics
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H-Index50
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i10 Index118
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Citation Counts11,891
Rankings
Membranes | Cultivation of Algae | Bioprocessing Engineerin
H-Index Metrics
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H-Index50
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i10 Index135
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Citation Counts9,227
Rankings
Chemical Engineering | Membrane | Absorption | Process Modeling and Scale-up | Computational Flui
H-Index Metrics
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H-Index49
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i10 Index125
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Citation Counts6,711
Rankings
Magnetic Nanoparticles | Magnetic Separation | Magnetophoresis | Colloid and Interface Scienc
H-Index Metrics
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H-Index48
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i10 Index89
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Citation Counts8,467
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