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A D V A N C E D M A T E R I A L S & P R O C E S S E S | O C T O B E R 2 0 1 8 9 much quieter. The engine and exhaust system of a jet are the main sources of noise, but jet engines are far too hot for materials typically used for sound deadening such as polymer foams. One possibility for reducing aircraft engine noise is to combine regular sound in- sulation with extremely heat-resistant metal superalloys like those already used for jet turbine blades. The A*STAR team showed that reg- ular polymer foams can be used as a template from which to create heat-re- sistant, sound-suppressing superalloy metallic foams. Researchers developed a technique where they coat a slurry of the nickel-base superalloy onto a poly- mer foam, then burn off the polymer to leave behind an open-cell metallic possessing both mechanical strength and acoustic damping performance in one component, say researchers. www.a-star.edu.sg/simtech. Scanning electron micrograph of the nickel-base superalloy open-cell foam. Courtesy of Singapore Institute of Manufacturing Technology. foam with the same structure as the original polymer. Through develop- ment of a predictive model, the team found that sound absorption is usual- ly better when the pores are smaller. The tinier the pores, the longer and more difficult the sound wave’s path is through the material, and the more time the material has to damp sound energy by converting it to heat—a phenomenon known as the thermo- viscous effect. The next step is to better control the template replication process so that a tunable gradient of pore sizes can be formed within a single foam block. The improved foam could be used as the core material of a sand- wich-structured composite material, STATEMENT OF OWNERSHIP, MANAGEMENT, CIRCULATION, ETC. Required by the Act of 23 October 1962, Section 4369, Title 39, United States Code, showing the ownership, management, and circulation of Advanced Materials & Processes ®, publishes eight issues per year: January, February/March, April, May/June, July/August, September, October, and November/December at 9639 Kinsman Road, Materials Park, Ohio 44073, USPS # 762- 080. Annual subscription rate is $475. The publisher and editor are Scott D. Henry and Frances Richards, respectively, both of 9639 Kinsman Road, Materials Park, Ohio, 44073. The owner is ASM International®, Materials Park, Ohio, which is a not-for-profit educational institution, the officers being; President and Trustee, Frederick E. Schmidt, Jr; Vice President and Trustee, David U. Furrer; Secretary and CEO, William T. Mahoney; Treasurer and Trustee, Craig D. Clauser; Immediate Past President and Trustee, William E. Frazier; Trustees, Prem K. Aurora, Ellen K. Cerreta, Ryan M. Deacon, Larry D. Hanke, Roger A. Jones, Thomas M. Moore, Sudipta Seal, Judith A. Todd, and John D. Wolodko; Student Board Members Aadithya Jeyaranjan, Kenna Ritter, and Eli Vandersluis. There are no known bondholders, mortgagees, and other security holders owning or holding 1% or more of the total amount of bonds, mortgages, or other securities. The issue date for circulation data below is September 2018. The average number of copies of each issue during the pre- ceding 12 months is: (a) Total number of copies printed: 10,987; (b) Paid and/or requested circulation: (1) Paid/requested out- side-county mail subscriptions: 8,794; (2) Paid in-county subscriptions: 0; (3) Sales through dealers and carriers, street vendors, counter sales, and other non-USPS paid distribution: 1,389; (4) other classes mailed through the USPS: 0; (c) Total paid and/ or requested circulation: 10,183; (d.1) Free distribution or nominal outside-county: 332; (d.3) Free distribution by mail: 410; (e) Total free distribution: 742; (f) Total distribution: 10,925; (g) Copies not distributed: 442; (h) Total: 11,367; (i) Percent paid: 93. The actual number of copies of single issue published nearest to filing date is: (a) Total number of copies printed: 10,729; (b) Paid and/or requested circulation: (1) Paid/requested outside-county mail subscriptions: 7,826; (2) Paid in-county subscrip- tions: 0; (3) Sales through dealers and carriers, street vendors, counter sales, and other non-USPS paid distribution: 1,831; (4) other classes mailed through the USPS: 0; (c) Total paid and/or requested circulation: 9,657; (d.1) Free distribution or nominal outside-county: 481; (d.3) Free distribution by mail: 509; (e) Total free distribution: 990; (f) Total distribution: 10,647; (g) Copies not distributed: 560; (h) Total: 11,207; (i) Percent paid: 91. I certify that the statements made by me above are correct and complete. Scott D. Henry Publisher