Engineering 81 Research 55 Telecommunication 47 Biotechnology 45 Information technology 44 Technology 43 Materials 41 יותר ... Management 39 Nanotechnology 38 Food 36 Périodiques 33 Electronics 32 Food industry and trade 31 Mechanical engineering 31 Electrical engineering 30 Zeitschrift 29 Civil engineering 27 Materials science 27 Building 25 Equipment and supplies 25 Environmental aspects 24 Power resources 23 Production engineering 23 Environmental protection 22 Automobiles 21 Manufacturing processes 21 Nutrition 21 Production management 21 Technological innovations 21 Operations research 20 פחות ...