TJ Mechanical engineering and machinery 442 Technology: general issues 387 History of engineering and technology 304 Mechanical engineering & materials 150 Materials science 140 Research & information: general 118 human 115 TA Engineering (General). Civil engineering (General) 109 Humans 100 History of engineering & technology 84 TP Chemical technology 84 Tensile strength 63 Article 57 Mechanical properties 57 Chemistry 54 controlled study 54 male 52 Physics 51 chemistry 49 female 49 Scanning electron microscopy 47 Compressive strength 45 Microstructure 43 Research and information: general 41 procedures 40 adult 39 Male 38 Female 36 Mechanical engineering 36 Mechanical engineering and materials 35