Book excerpt: In the 61st volume of "International Journal of Engineering Research in Africa" are included the peer-reviewed manuscripts reflecting the research results in the fields of structural metals and composite materials, technologies of materials processing and synthesis, biomass gasification technology and numerical analysis processes of natural convection in the porous medium. Readers will also be interested in investigations in radio electronics, wind energy and energy management, building materials and geotechnics. The presented scientific articles will be appreciated by many engineers and technologists from the industrial sector, as well as academics and students majoring in engineering science.