Research & information: general 92 Technology: general issues 82 History of engineering and technology 75 QC Physics 66 Physics 65 TP Chemical technology 41 Research and information: general 23 Materials science 21 Article 18 Temperature 18 Heat transfer 17 TJ Mechanical engineering and machinery 17 Thermal 17 Thermal conductivity 17 Biology, life sciences 16 History of engineering & technology 16 Thermogravimetric analysis 16 Scanning electron microscopy 15 TA Engineering (General). Civil engineering (General) 15 chemistry 14 Condensed matter physics (liquid state and solid state physics) 13 QA Mathematics 13 Thermodynamic stability 13 Thermoelectric equipment 13 controlled study 12 nonhuman 12 Numerical methods 11 Fourier transform infrared spectroscopy 10 Magnetohydrodynamics 10 X ray diffraction 10