The idea of 29th BARCELONA International Conference on Latest Trends in Engineering, Technology and Natural Sciences (LTETN-25) on Jan. 8-10, 2025 Barcelona (Spain) is for the scientists, scholars, engineers and students from the Universities all around the world and the industry to present ongoing research activities, and hence to foster research relations between the Universities and the industry. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration. LLTETN-25 is sponsored by Universal Researchers in Engineering (URENG). All full paper submissions will be peer reviewed and evaluated based on originality, technical and/or research content/depth, correctness, relevance to conference, contributions, and readability.