TA Engineering (General). Civil engineering (General) 108 TJ Mechanical engineering and machinery 92 QA Mathematics 24 TK Electrical engineering. Electronics Nuclear engineering 24 Finite element method 22 T Technology (General) 8 Q Science (General) 6 TP Chemical technology 6 Unspecified 6 Mechanics applied to machinery. Dynamics 5 TL Motor vehicles. Aeronautics. Astronautics 4 QH301 Biology 3 R Medicine (General) 3 TH Building construction 3 QA76 Computer software 2 QC Physics 2 QH Natural history 2 RD Surgery 2 TG Bridge engineering 2 Vibration 2 3D printing 1 Additive manufacturing 1 Aerodynamics 1 Aeronautics. Aeronautical engineering 1 Aerospace 1 Aircraft 1 Airway (Medicine) 1 Ambulatory blood pressure monitoring 1 Analysis 1 Analytical methods used in the solution of physical problems 1