Engineering & Materials Science
Fuel cells
100%
Proton exchange membrane fuel cells (PEMFC)
92%
Lipids
59%
Design of experiments
54%
Biofuels
42%
Biomass
40%
Algae
38%
Metal forming
30%
Biogas
29%
Microwaves
27%
Soils
26%
Cooling
25%
Electrolytes
24%
Waste heat utilization
23%
Anaerobic digestion
23%
Carbon dioxide
22%
Adsorption
22%
Hydrogen storage
21%
Feedstocks
21%
Methane
21%
Renewable energy resources
21%
Finite element method
21%
Cooling systems
20%
Geometry
20%
Solid-State Batteries
20%
Hot Temperature
19%
Temperature
18%
Hydrogen
18%
Membranes
17%
Fossil fuels
17%
Waste paper
16%
Particle swarm optimization (PSO)
16%
Waste heat
16%
Economics
15%
Lignocellulosic biomass
15%
Protons
15%
Cell membranes
15%
Biodiesel
15%
Piezoelectric materials
14%
Lead acid batteries
14%
Construction industry
14%
Lead
14%
Urea
13%
Battery storage
13%
Gas emissions
13%
Engineering education
13%
Graphene
13%
Supercapacitor
13%
Temperature control
13%
Desalination
13%
Earth & Environmental Sciences
waste paper
30%
fuel cell
25%
biomass
21%
methane
15%
battery
15%
solar cell
15%
magnetic reversal
14%
cost analysis
14%
biofuel production
14%
wind turbine
12%
computational fluid dynamics
11%
energy
11%
biogas
11%
digestion
11%
stack
10%
alternative energy
10%
pyrolysis
10%
material
10%
respiration
10%
carbon dioxide
10%
electric vehicle
9%
microwave
9%
experimental study
9%
particle size
8%
market
8%
cooling
8%
cold
8%
economics
7%
biofuel
7%
food
7%
adsorption
7%
acid
7%
nuclear magnetic resonance
7%
silicon
6%
effect
6%
oil
6%
fossil fuel
6%
modeling
5%
cost
5%
groundnut
5%
membrane
5%
oxide
5%
evaluation
5%
copper
5%
heating
5%
temperature
5%
telluride
5%
heat storage
5%
torque
5%
Chemistry
Cooling
30%
Energy
21%
Industry
19%
Application
18%
Shape
17%
Waste Heat
17%
Shape Memory Alloys
16%
Inoculum
15%
Turbine
15%
Current
14%
Hydrogen
14%
Simulation
14%
Voltage
12%
Microwave
12%
Energy Storage
12%
Flow Kinetics
11%
Fuel
11%
Metal
11%
Food
10%
Fossil Fuel
10%
Heat
9%
Polarity
9%
Methane
9%
Chemical Stability
8%
Resistance
8%
Biofuel
8%
Single Crystalline Solid
8%
Nuclear Power Plant
8%
Graphene
8%
Internal Pressure
8%
Strain
7%
Surface
7%
Air Pollution
7%
Proton
7%
Thermal Stability
6%
Reaction Yield
6%
Solar Energy
6%
Adsorption
5%
Pump
5%
Heat Storage
5%
Time
5%
Ionic Conductivity
5%
Energy Balance
5%
Force
5%