The 45th volume of the journal "Advanced Engineering Forum" contains peer-reviewed papers that present the engineering solutions and research results in dye-sensitized solar cell, mechanical properties of welded rail joints and designing of morphing air wing with flexure hinge, construction mechanics, assessment of effectivity of two types of biofilters in a constructed wetland for the wastewater treatment. For readers will be interesting also the results of using the bio inhibiter for corrosion prevention, the conceptual design of the high-voltage transformer for scientific and industrial applications, results of cost-reduced optimisation of the hybrid renewable energy microgrid, and the design of cloud architecture for the cyber-manufacturing systems. The professionals, students, and scientific investigators working in the various engineering fields will find this volume of value.