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.

The 65th issue of the journal includes articles that describe the latest research results in 3D printing, anaerobic digestion of solid municipal waste, analysis of building seismic performance, properties of bio-based insulation material, and soil properties for geotechnical works. There are also designed floating photovoltaic panels, and control systems for hydroponics and analyze means for equipment efficiency improvement through a lean approach in small and medium enterprises. This volume will be helpful to many engineers in machinery, manufacturing and construction.

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

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.

The 64th volume of the journal represents the research results of mechanical properties and delamination mode of a carbon-fibre-reinforced polymer composite, experimental and numerical studies of viscoelastic behaviour of bituminous mixture with a high rate of reclaimed asphalt pavement, optimisation of energy consumption for a synthetic ammonia's production, modelling of heat processes in the systems that use solar energy and energy management in a related microgrid. There are articles devoted to image processing for automatic navigation technology in agricultural machines and the development of a hybrid artificial Intelligence-based system for supporting the eco-industrialisation of complex manufacturing processes. The volume will be helpful to specialists in machinery, construction, thermal engineering, usage of solar energy, renewable energetics and industrial automation.

We present to our readers the 45th 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, ergonomics and optimization of technological parameters, power distribution and power efficiency, control, faults diagnosis 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. Cemented Carbide, Powder Metallurgy, Laser Shock Peening, Friction Stir Welding, Process Parameters, Lateritic Soil, Glass Fines, Cement, Mass Damper, Ergonomics, Postural Strain Assessment, Wind Energy, Potential Assessment, Automatic Power Generation Control, Output Vector Feedback Control, Distributed Generation, Daily Load Variation, Dynamic Matrix Control, Reactive Distillation Process, Faults Diagnosis, Discrete Event Systems, Reliability Law, Aircraft Maintenance, Error Detection, Supply Chain, Digital Transformation, Optimization, Food, Fast Fashion Materials Science, Building Materials, General Engineering.

Geotechnical engineering, civil engineering, and other allied engineering disciplines have, for a long time, shifted from problem solving to creating problems that plague our planet. This book, Sustainable Soils Re-Engineering, is here to point the world to a more environmentally friendly approach to solving problems using engineering skills. This book moved from the use of cement, which contribute hugely to global warming through the release of oxides of carbon, to the utilization of derivatives of solid-waste materials in the form of ash or powder. These are derived through direct combustion and crushing. Yet one may wonder where the oxides of carbon released during combustion is managed. This book also proposes a model through which oxides of carbon are entrapped through a controlled combustion mechanism. That way, ash is generated for use as geomaterial, and the environment is left healthy. The operation of utilizing solid waste equally rids the environment of its plaguing condition in the process. Also the more practical approach exposed in this book will assist researchers across the world to explore new and novel grounds toward helping humanity. More on this is the bringing forth of mathematical methods like the extreme vertex design adopted in modeling properties of re-engineered soils.