Classification
EHA - Renewable energy sources
91
EBA - Energy production, energy technology
8
ENA - Energy from biomass and waste
6
EIA - Solar energy - general
4
EKA - Wind energy
3
EMA - Hydroelectric, tidal energy
3
TEJ - Electric devices, mechanical devices, magnets, dielectrics
3
UEF - Sustainability
3
CNW - Electrochemical energy production and conversion
2
CNWK - Electric batteries
2
EAD - Energy - comprehensive works
2
ESB - Hydrogen energy
2
EVA - Energy demand, energy supply - comprehensive works
2
EVB - Energy supply of Germany
2
EVN - Energy supply - future aspects
2
EVP - Energy models, energy system analysis
2
FJB - Electric materials
2
TED - Electric power - industrial aspect
2
UKA - Environmental damage and energy production
2
UKE - Environment and energy resources
2
CHXP - Thermochemistry
1
CXX - Hydrogen production - chemistry and technology
1
EIP - Photovoltaics
1
EIS - Solar cells
1
ELA - Geothermal energy
1
ETA - Energy storage
1
ETC - Energy conversion
1
EUL - Heat pumps
1
EXA - Energy policy
1
FMXG - Metal hydrogen systems - specific aspects, specific systems
1
FNX - Carbon, carbon materials
1
LEL - Botany - lower plants
1
LEO - Chemical compounds from plants
1
LTN - Biotechnology - biodegradation
1
LWO - Agricultural ecology, sustainable agriculture
1
MWE - Decision theory, game theory
1
TEDD - Electric power transmission
1
TGN - Control engineering
1
UCEA - Environmental impact
1
UHCH - Urban areas
1
UKH - Environment and power plants, industrial plants
1
UMV - Climatic change
1
YRD - Technology assessment
1