Engineering 122 Research 54 Telecommunication 47 Technology 45 Information technology 43 Management 40 Biotechnology 39 المزيد ... Nanotechnology 37 Materials 36 Food 35 Périodiques 35 Study and teaching 35 Electronics 34 Electrical engineering 33 Mechanical engineering 33 Zeitschrift 32 Civil engineering 30 Building 26 Food industry and trade 26 Equipment and supplies 25 Materials science 24 Environmental aspects 23 Industrial engineering 21 Production engineering 21 Computer networks 20 Nutrition 20 Production management 20 Environmental protection 19 Operations research 19 Automobiles 18 أقل ...