| Index | Example of keywords | Number |
|---|
| 0-9 | 3D Flash Memory (1), 3D structure analysis (1), 3D extrusion bioprinting (1), 3D bioprinting (1), 3D food printer (1), 3D extrusion printing (1) , etc | 9 |  |
|---|
| A | Adsorption (9), ammonia (5), Artificial Intelligence (4), adhesion (3), Activated Carbon (3), ALD (2) , etc | 145 | |
|---|
| B | biomass (6), biologics (4), bio-oil (3), Battery (2), Biomass-based solvent (2), Binder (2) , etc | 74 | |
|---|
| C-CH | Carbon dioxide (11), CFD (10), Carbon Neutral (5), carbon nanotube (5), Catalyst (4), carbon membrane (3) , etc | 147 | |
|---|
| CI-CZ | crystallization (10), CO2 capture (5), CO2 (5), CO2 utilization (4), CO2 methanation (4), core-shell particle (3) , etc | 172 | |
|---|
| D | Drying (9), Dehydrogenation (4), degradation (4), Dispersion (3), DBD plasma (3), Discussion (3) , etc | 132 | |
|---|
| E | extraction (8), equation of state (5), Emulsion (4), energy system (3), ethanol (3), enzyme (3) , etc | 111 | |
|---|
| F | Fluidized Bed (7), Fuel cell (6), fouling (3), forward osmosis (3), Food loss (2), flotation (2) , etc | 100 | |
|---|
| G | Gas Separation (5), Graphene oxide (5), gold (5), Gas permeation (3), Gate adsorption (3), Granulation (3) , etc | 74 | |
|---|
| H | hydrogen (6), hydrogel (5), Hot compressed water (3), hydrogen production (3), HFO-1234ze(E) (2), Heat transfer (2) , etc | 119 | |
|---|
| I | Ionic liquid (6), interfacial polymerization (3), impedance measurement (2), immunosensor (2), immobilized enzyme (2), Image analysis (2) , etc | 77 | |
|---|
| J | Janus wettability (1), JX Nippon Mining & Metals (1), JBE (1) | 3 | |
|---|
| K | kinetics model (2), kaolinite (1), Kesennuma Bay (1), Keeling model (1), Keratin plug (1), Kinetic study (1) , etc | 7 | |
|---|
| L | Lithium ion battery (6), Latent Heat Storage (4), Lithium-ion Battery (4), Life Cycle Assessment (3), liquid marble (2), Layered Double Hydroxide (2) , etc | 80 | |
|---|
| M-MH | machine learning (22), membrane (8), membrane reactor (8), Materials Informatics (6), manufacturing (5), metabolic engineering (4) , etc | 138 | |
|---|
| MI-MZ | Mixing (13), MOFs (6), Microfluidic device (6), microgel (4), Molecular dynamics simulation (4), microcapsule (4) , etc | 139 | |
|---|
| N | nanoparticles (9), nanoparticle (8), numerical simulation (5), Nanofiltration (3), Nano dispersion (2), Nitrogen fixation (2) , etc | 104 | |
|---|
| O | optimization (5), Oxygen reduction reaction (3), OpenFOAM (2), oxidation (2), Operando (2), operating conditions (1) , etc | 56 | |
|---|
| P-PH | peptide (5), Paclitaxel (3), Phase change material (3), Phase Equilibrium (3), P/L reaction (2), Particle method (2) , etc | 89 | |
|---|
| PI-PZ | polymer electrolyte fuel cell (11), process simulation (5), polymer (5), Pyrolysis (4), Polymer coating (4), plasma (4) , etc | 156 | |
|---|
| Q | quicklime (1), Quenchbody (1), Quantum Chemistry (1), quantum dot (1), quantum chemical calculation (1), quaternary ammonium (1) , etc | 6 | |
|---|
| R | Renewable Energy (3), rheology (3), Reinforcement Learning (3), Renewable hydrogen (3), reactive crystallization (2), Ru catalyst (2) , etc | 73 | |
|---|
| S-SO | Simulation (8), Solubility (6), Self-assembly (6), slurry (5), Scale-Up (3), solvent extraction (3) , etc | 147 | |
|---|
| SP-SZ | Supercritical CO2 (7), Structured catalyst (6), Surface modification (5), Subcritical water (5), Supercritical Carbon Dioxide (5), Supercritical (4) , etc | 115 | |
|---|
| T | thermal plasma (4), thermal conductivity (3), Transdermal drug delivery (3), Taylor-Couette flow (2), Thermochemical heat storage (2), Transport of active materials (2) , etc | 85 | |
|---|
| U | ultrasound (3), Ultrasonic atomization (2), Upcycling system (1), Upgreading (1), Upgrading (1), Unsupervised learning (1) , etc | 18 | |
|---|
| V | vaccine (7), viscosity (4), Vibration (3), vanillin (2), Viscous fingering (2), virus-like particle (1) , etc | 40 | |
|---|
| W | Woody biomass (3), waste concrete (2), water treatment (2), water (2), Water Condition (1), waste iron recycling (1) , etc | 31 | |
|---|
| X | X-ray computed tomography (1), X-ray Absorption Spectroscopy (1), Xanthophyllomyces dendrorhous (1), X-ray CT imaging (1) | 4 | |
|---|
| Y | Yield stress fluids (1), Yttrium doping (1) | 2 | |
|---|
| Z | Zeolite (15), ZSM-5 (2), ZIF-8 (2), Zwitterionic Polymer (1), zinc plating wastewater (1), zeolite membrane (1) , etc | 32 | |
|---|
| Non alphanum. | * (9) | 9 | |
|---|
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