This book focuses on the applications in engineering science that require expertise in mathematics, physics, and chemistry. Its mission is to become a voice of the applied science community, addressing researchers and practitioners in different areas ranging from mathematics, physics, and chemistry to all related branches of the engineering, presenting verifiable computational methods, findings, and solutions.

It is resulted from the 4th International Conference on Applied Sciences and Engineering 2025 organized in Ulaanbaatar, Mongolia in Central Asia from June 9 to 10. The conference plays a significant role in promoting the work of Mongolian researchers on the global stage and facilitating the exchange of experiences with researchers from many other countries. Researchers, scientists, engineers, and graduate students in the fields of engineering, mathematics, physics, and chemistry will find this book helpful to learn new ideas and experiences.