Earth & Environmental Sciences
fuel cell
81%
engine
67%
vehicle
57%
oxide
54%
combustion engine
48%
flight
31%
liquid
29%
power generation
25%
methanol
24%
shaft
24%
train
22%
lithium
13%
battery
12%
energy
11%
inspection
11%
stack
11%
polymer
9%
combustion
9%
water resource
9%
crop
8%
agriculture
8%
oxidation
7%
degradation
7%
air
6%
Engineering & Materials Science
Engine pistons
100%
Solid oxide fuel cells (SOFC)
79%
Unmanned aerial vehicles (UAV)
67%
Engines
35%
Hybrid powertrains
26%
Liquid fuels
20%
Internal combustion engines
17%
Power generation
15%
Methanol fuels
13%
Liquids
12%
Water resources
11%
Fueling
11%
Crops
10%
Agriculture
10%
Lithium-ion batteries
9%
Methanol
9%
Oxidation
8%
Durability
7%
Inspection
6%
Degradation
6%
Air
5%
Testing
4%
Chemical Compounds
Fuel
60%
Internal Combustion Engine
55%
Shaft
50%
Nitromethane
42%
Liquid
39%
Combustion Engine
30%
Methanol
22%
Energy
17%
Volume
10%
Mixture
8%
Time
6%
Application
5%