History of engineering & technology 639 Technology: general issues 290 machine learning 77 deep learning 57 mechanical properties 55 optimization 53 microstructure 48 energy efficiency 40 numerical simulation 40 sustainability 36 renewable energy 33 simulation 32 finite element analysis 31 additive manufacturing 29 artificial intelligence 29 climate change 28 Environmental science, engineering & technology 27 modeling 26 stability 25 finite element method 24 3D printing 23 Materials science 23 convolutional neural network 23 genetic algorithm 23 adsorption 22 artificial neural network 22 electric vehicle 22 nanoparticles 22 image processing 21 uncertainty 21