Technology: general issues 47 History of engineering and technology 40 Research & information: general 27 Density functional theory 19 Artificial intelligence 17 QC Physics 16 History of engineering & technology 15 Algorithms and data structures 14 Computer science 14 human 14 Research and information: general 13 Information technology industries 12 Mathematical theory of computation 12 Electronic structure 11 article 10 Algorithms & data structures 9 Computation theory 9 Mathematics & science 9 Software Engineering 9 Chemistry 8 Humans 8 Political science & theory 8 QA75 Electronic computers. Computer science 8 density functional theory 8 Biology, life sciences 7 Expert systems / knowledge-based systems 7 Nuclear physics 7 QA Mathematics 7 Sociology 7 decision making 7