Classification
ETA - Energy storage
122
CNWK - Electric batteries
30
EHA - Renewable energy sources
30
ETC - Energy conversion
23
EBA - Energy production, energy technology
22
CNW - Electrochemical energy production and conversion
19
EXA - Energy policy
17
ETF - Fuel cells - general
15
EIC - Solar thermal energy conversion
14
EIA - Solar energy - general
13
ESB - Hydrogen energy
11
PGN - Fusion technology, plasma devices
11
EAD - Energy - comprehensive works
8
EIP - Photovoltaics
8
EVP - Energy models, energy system analysis
8
EWA - Energy economy
8
TKJ - Traffic
8
UKA - Environmental damage and energy production
8
CNO - Electrolytes
7
CXX - Hydrogen production - chemistry and technology
6
EIK - Solar energy application
6
EUA - Energy conservation - general
6
FGN - Nanotechnology
6
EAE - Energy - general
5
EVN - Energy supply - future aspects
5
FNPE - Nanostructured materials
5
CNR - Electrodes
4
ENA - Energy from biomass and waste
4
PGH - Plasma diagnostics
4
TEJ - Electric devices, mechanical devices, magnets, dielectrics
4
CNE - Electrochemistry
3
CNU - Electrochemical synthesis, electrochemical engineering
3
ECA - Energy resources
3
EIE - Solar equipment
3
EVA - Energy demand, energy supply - comprehensive works
3
FAP - Advanced materials - development and applications
3
PGKA - Physics of thermonuclear fusion
3
PGLD - Pinch effect, pinch machines
3
PKG - Accelerators
3
THM - Heat transfer, mass transfer - technical aspects
3
EIS - Solar cells
2
EVB - Energy supply of Germany
2
FAE - Materials research - general interest
2
FNPD - Hard materials, refractory compounds
2
FNPH - Ceramics for specific applications
2
FNX - Carbon, carbon materials
2
GDA - Engineering geology - general
2
TKF - Power plants
2
TNG - Breeder reactors
2
UEF - Sustainability
2
more ...