Classification
ETC - Energy conversion
254
EXA - Energy policy
33
ETF - Fuel cells - general
19
ETA - Energy storage
11
EHA - Renewable energy sources
10
CNW - Electrochemical energy production and conversion
8
TKJ - Traffic
8
ECA - Energy resources
7
ESB - Hydrogen energy
7
EBA - Energy production, energy technology
6
EVP - Energy models, energy system analysis
6
UHK - Traffic and environment - incl. automobile exhaust gas
6
UKB - Environmental effects and energy
6
CNWK - Electric batteries
5
UA - Environment - general
5
CNE - Electrochemistry
4
EGA - Oil shale, oil sands
4
EVA - Energy demand, energy supply - comprehensive works
4
TKF - Power plants
4
TKH - Air flight, space flight
4
CWE - Chemical engineering, chemical industry - general
3
EPK - Nuclear energy
3
LEP - Photosynthesis
3
LTE - Biotechnology - general aspects
3
LTN - Biotechnology - biodegradation
3
PGKA - Physics of thermonuclear fusion
3
TIG - Reliability, safety, quality control
3
TNA - Nuclear engineering - general
3
CH - Physical chemistry
2
CMD - Photochemistry - special aspects
2
CMDK - Excited states in molecules
2
CMDS - Photochemical processes in nature and technology
2
CXA - Coal and fossil fuel - chemistry and technology
2
EIC - Solar thermal energy conversion
2
ENA - Energy from biomass and waste
2
EUA - Energy conservation - general
2
EVN - Energy supply - future aspects
2
FJEH - Molecular electronics
2
FNP - Ceramics - specific materials
2
LEL - Botany - lower plants
2
LHH - Microbiology - methods
2
LMRC - Membrane transport
2
LMS - Bioenergetics
2
TED - Electric power - industrial aspect
2
THD - Design and construction in mechanical engineering
2
THL - Thermodynamics - technical aspects
2
THS - Turbines, pumps
2
TND - Gas cooled reactor types
2
TNG - Breeder reactors
2
UKE - Environment and energy resources
2
more ...