Classification
ETA - Energy storage
180
CNWK - Electric batteries
17
ETC - Energy conversion
11
CNW - Electrochemical energy production and conversion
6
ESB - Hydrogen energy
6
ETF - Fuel cells - general
5
FMXG - Metal hydrogen systems - specific aspects, specific systems
4
TKJ - Traffic
4
EUA - Energy conservation - general
3
THM - Heat transfer, mass transfer - technical aspects
3
EIA - Solar energy - general
2
EIP - Photovoltaics
2
EKA - Wind energy
2
ENA - Energy from biomass and waste
2
EXA - Energy policy
2
FGN - Nanotechnology
2
FNPE - Nanostructured materials
2
FNX - Carbon, carbon materials
2
GDA - Engineering geology - general
2
TBV - Electronic devices
2
TED - Electric power - industrial aspect
2
CBR - Inorganic synthesis and reactions of metals and their compounds
1
CH - Physical chemistry
1
CNE - Electrochemistry
1
CNR - Electrodes
1
CXX - Hydrogen production - chemistry and technology
1
EHA - Renewable energy sources
1
EIC - Solar thermal energy conversion
1
EIS - Solar cells
1
ELA - Geothermal energy
1
EMA - Hydroelectric, tidal energy
1
ETFD - Solid oxide fuel cells ( SOFC )
1
EUC - Energy conservation - civil engineering
1
EVP - Energy models, energy system analysis
1
FNPD - Hard materials, refractory compounds
1
FNPH - Ceramics for specific applications
1
GKAB - Geothermics
1
GKK - Geophysics - applications
1
GKKF - Geothermic methods
1
TEJ - Electric devices, mechanical devices, magnets, dielectrics
1
TKD - Air conditioning, refrigeration
1
TNLC - Nuclear fuel cycle
1
UA - Environment - general
1
UEF - Sustainability
1
UHCH - Urban areas
1