The passage discusses advancements in the measurement and analysis of acoustic data, including the use of digital computers, transfer noise, and transfer matrix methods for hydraulic piping systems. It highlights the importance of sound field analysis, coherence techniques, and the measurement of sound power levels. The text also mentions the progress in international standardization of aircraft contour calculations and noise reduction measures in various industries, such as office, machinery, and construction. Additionally, it reviews the content of a symposium and introduces two books: "Introduction to Applied Mathematics" by G. Strang and "Advanced Mechanics of Materials" by A.P. Boresi and O.M. Sidebottom, emphasizing their contributions to applied mathematics and mechanics of materials, respectively.The passage discusses advancements in the measurement and analysis of acoustic data, including the use of digital computers, transfer noise, and transfer matrix methods for hydraulic piping systems. It highlights the importance of sound field analysis, coherence techniques, and the measurement of sound power levels. The text also mentions the progress in international standardization of aircraft contour calculations and noise reduction measures in various industries, such as office, machinery, and construction. Additionally, it reviews the content of a symposium and introduces two books: "Introduction to Applied Mathematics" by G. Strang and "Advanced Mechanics of Materials" by A.P. Boresi and O.M. Sidebottom, emphasizing their contributions to applied mathematics and mechanics of materials, respectively.