Classification
EXA - Energy policy
33
CXX - Hydrogen production - chemistry and technology
6
ETFD - Solid oxide fuel cells ( SOFC )
4
EUA - Energy conservation - general
4
UMV - Climatic change
4
ESB - Hydrogen energy
3
ETA - Energy storage
3
UED - Environmental policy
3
EBA - Energy production, energy technology
2
EEA - Coal - general
2
EHA - Renewable energy sources
2
GWBA - Raw material resources, raw material reserves
2
TIH - Ergonomics, man machine systems
2
CXRU - Synthetic fuels
1
DYA - Artificial intelligence
1
EFA - Petroleum, natural gas
1
EGA - Oil shale, oil sands
1
EIK - Solar energy application
1
EIM - Solar architecture
1
EUC - Energy conservation - civil engineering
1
EVN - Energy supply - future aspects
1
EWA - Energy economy
1
GRBA - Climatology - general
1
GWA - Raw material economy, raw material policy
1
GWAA - Raw material programs
1
PGN - Fusion technology, plasma devices
1
TNJB - Nuclear reactor materials
1
UHK - Traffic and environment - incl. automobile exhaust gas
1
UKB - Environmental effects and energy
1
UPN - Water protection, water quality, clean water
1