Special topic volume with invited peer reviewed papers only.

The 41st volume of International Journal of Engineering Research in Africa contains articles describing the research results in the fields of materials science, mechanical engineering, control, wireless sensor networks, construction materials and technologies, technological processes and materials in the chemical production, freight transportation and structural analysis of production systems. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.

We are glad to present to our readers the 37th 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, construction materials and technologies, technological processes in the chemical production and environmental engineering, network engineering and supply chain. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.

The 71st volume of the journal is dedicated to recent achievements in engineering practice and scientific research results in a wide range of industrial branches. The transport mechanism in the diffusion layer in proton exchange membrane fuel cell, mechanical characteristics and performance of various green building materials, predictive control for biomass boiler and automatic generation control in power system, and also analysis of efficient resource allocation in cloud computing are the topics of this issue. This journal's volume will be helpful to many engineers in the modern production sector and construction.

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.

This journal volume contains papers that reflect research results in materials science, power engineering, and environmental engineering. Additionally, under the focus of this volume is the study on reducing wastes formation in the construction industry. Furthermore, the presented research results may find useful for scientists and engineers deal with powder metallurgy issues and material characterization. Some papers are devoted to solving drilling issues in the oil and gas industry. Eventually, the volume presents an analysis of various algorithms that can find their application in civil and industrial engineering areas.

We present to our readers the 46th volume of "International Journal of Engineering Research in Africa." This volume contains articles reflecting the research results in the fields of materials science, applied mechanics and mechanical engineering, power engineering and power efficiency, facial expression recognition and optical communication, 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.