The 55th volume of "International Journal of Engineering Research in Africa" is compiled from the peer-reviewed manuscripts that present the research results in applied and fluid flow mechanics, computational analysis of heat and mass transfer processes, and investigation of the chaotic systems. This volume also considered the conceptual model for mitigating security vulnerabilities in smart grid electric energy distribution systems. The last research results in materials science and materials processing technologies, anti-corrosive coating, biodiesel synthesis, wastewater treatment technologies, and waste recycling are presented.

We are glad to present our readers with the 40th volume of International Journal of Engineering Research in Africa. This volume contains articles describing the research results in the fields of materials science, mechanical engineering, power distribution and power control, construction materials and technologies, technological processes in the wastewater treatment and industrial engineering. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.

Automation and Control of Mechanical Systems and Technological Processes Special topic volume with invited peer reviewed papers only.

For your attention is presented the 23rd volume of International Journal of Engineering Research in Africa. In this issue collected manuscripts which describe the results of research and engineering decisions in many branches of engineering knowledge and practice such as materials and processing technologies in mechanical engineering, construction and in architecture; design and research of machines and mechanisms; modern methods and algorithms of optimization and data mining and latest researches in area of organization of manufacture. We hope this volume will be useful for a wide audience of readers, from students to practicing engineers.

Special topic volume with invited peer reviewed papers only.

We present the 53rd volume of the "International Journal of Engineering Research in Africa" to our readers. This volume contains the articles reflecting the research results in the fields of structural alloys, applied mechanics and mechanical engineering, assessment of the potential efficiency of use the cleaner electricity generation, materials and technologies in construction, biofuel production and chemical treatment of the industrial wastewater, remote sensing, and industrial engineering. The articles will be useful for many engineers as well as for academic teachers and students majoring in the mentioned fields of engineering science.

We are glad to present the 35th volume of International Journal of Engineering Research in Africa. This volume contains articles describing the research results in the fields of materials science in the mechanical engineering, construction materials, technological processes in the chemical production, power distribution and engineering management. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.