We present for our readers the 33rd volume of the International Journal of Engineering Research in Africa which contains articles describing the results of engineering research and solutions in the fields of the applied mechanics, research of materials and processing technologies in the mechanical engineering, construction materials and technologies, equipment design, power electronics, power distribution, technological processes in the chemical production, environmental engineering and engineering management. The articles will be useful for the professionals concerned with mechanical engineering, materials science, chemical engineering, power production and engineering management as well as for academic teachers and students majoring in these fields of engineering science.

We present the 56th volume of the "International Journal of Engineering Research in Africa" to our readers. The collection contains the articles reflecting the research results in the fields of structural steel and alloys, development of composites, applied mechanics and mechanical engineering, experimental investigations of cement and concrete properties, assessment of the seismic resistance of structures, reliable preventive maintenance scheduling in power systems, cloud computing technology in Cloud of Things, evaluation of sustainable transportation system. The articles will be helpful for many engineers, academic teachers, and students majoring in the mentioned branches of engineering science.

This periodical edition includes peer-reviewed papers based on results of scientific research and engineering solutions in different areas of modern engineering science.

The 51st volume of "International Journal of Engineering Research in Africa" includes peer-reviewed manuscripts reflecting the research results in the fields of materials science, applied mechanics, mechanical and power engineering, biomass processing, communication, construction, engineering management, and applied use of computational procedures and optimization methods in the research practice. The presented scientific articles can be appreciated by the majority of engineers, academic teachers, and students majoring in the fields of engineering science.

The 30th volume of the International Journal of Engineering Research in Africa presents the articles that describe the results of engineering research and solutions in the fields of applied mechanics, structural and building materials, materials and equipment for alternative and conventional energy engineering, chemical engineering, biotechnologies and engineering management of modern production. The articles will be useful for professionals concerned with mechanical engineering, materials science, chemical engineering, engineering management as well as for academic teachers and students majoring in related fields.

The 50th volume of "International Journal of Engineering Research in Africa" contains peer-reviewed manuscripts reflecting the research results in the fields of materials science, applied mechanics and mechanical engineering. Such issues as Steel Reinforcement, Strain Based Approach, Temperature, Thermo-Physical Properties, Vehicle Dynamics, Water Resources are raised in the volume. The presented scientific papers can be appreciated by the majority of engineers, researchers, academic teachers and students majoring in the fields of engineering science.

The 39th volume of International Journal of Engineering Research in Africa contains articles describing the research results in the fields of materials science, mechanical engineering, power engineering, construction materials and technologies, technological processes in the chemical production, planning and scheduling of production system. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.