<p>This book explores recent developments in theoretical research and mathematical modelling of real-world complex systems, organized in four parts. </p><p> </p><p>The first part of the book is devoted to the mathematical tools for the design and analysis in engineering and social science study cases. We discuss the periodic evolutions in nonlinear chemical processes, vibro-compact systems and their behaviour, different types of metal-semiconductor self-assembled samples, made of silver nanowires and zinc oxide nanorods.</p><p>The second part of the book is devoted to mathematical description and modelling of the critical events, climate change and robust emergency scales. In three chapters, we consider a climate-economy model with endogenous carbon intensity and the behaviour of Tehran Stock Exchange market under international sanctions.</p><p>The third part of the book is devoted to fractional dynamic and fractional control problems. We discuss the novel operational matrix techn