[ASME ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference - Portland, Oregon, USA (Sunday 4 August 2013)] Volume 4: 18th Design for Manufacturing and the Life Cycle Conference; 2013 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications - Second Order Accuracy Finite Difference Methods for Fractional Diffusion Equations