1. School of Engineering and Applied Science, Harvard University; Cambridge MA 02138 USA
2. Department of Material Science and Mechanical Engineering; Universitá degli Studi di Cagliari; Italy
3. Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz; 15827 Blankenfelde-Mahlow Germany
4. Rolls-Royce Energy; 9545 Cote de Liesse Dorval Québec H9P 1A5 Canada
5. School of Engineering and Applied Science; Harvard University; Cambridge MA 02138 USA
6. Kavli Institute, Harvard University; Cambridge MA 02138 USA