TK Electrical engineering. Electronics Nuclear engineering 172 TJ Mechanical engineering and machinery 65 TA Engineering (General). Civil engineering (General) 33 QA75 Electronic computers. Computer science 21 TP Chemical technology 16 QA76 Computer software 12 TL Motor vehicles. Aeronautics. Astronautics 11 T Technology (General) 8 TH Building construction 8 HE Transportation and Communications 7 Q Science (General) 7 QA Mathematics 6 HD Industries. Land use. Labor 5 HD28 Management. Industrial Management 5 NA Architecture 5 G70.212-70.215 Geographic information system 4 QC Physics 4 QD Chemistry 4 Simulation 4 TK7885-7895 Computer engineer. Computer hardware 4 Unspecified 4 T58.5-58.64 Information technology 3 TK5101-6720 Telecommunication 3 TS Manufactures 3 Digital Forensics 2 Digital evidence 2 EEG 2 FPGA 2 Framework 2 IEC 61499 2