PrefaceChapter 1: Properties and Processing Technologies of Structural MetalsOptimizing Hot Forging of 38MnSiVS5 Steel: A Multi-Objective Approach with Grey-Fuzzy MethodResearch Progress towards the Machining of Titanium Alloy Using CNC Milling: A Technical ReviewExperimental Analysis of the Behavior of Multiple Adhesive on the Single Lap Joint StrengthChapter 2: Recycling and Applications of Bio-Based MaterialsAntifeedant Nanosuspension Formula of Tithonia diversifolia Leaf Extract by Emulsion Inverse Method to Control Crocidolomia pavonana Cabbage Pest InsectExploring the Potential of Pangasius Catfish Oil as a Base Oil for Nanoemulsion Products: Optimization and CharacterizationKinetic Studies on MB Adsorption by Graphene like Material from Coconut Shell CharcoalThe Effectiveness of Concentration of Chitosan Extracted from Tiger Shrimp Shells as a Natural Preservative of Kenyar FishFabrication of a PETG-Based Biocarrier Using Additive Manufacturing for Moving Bed Biofilm Reactor (MBBR) Applications