1. Microphysical Mechanisms Behind the Nonlinear Elastic Response of Granular Media Open Access Author: Gao, Linying Title: Microphysical Mechanisms Behind the Nonlinear Elastic Response of Granular Media Graduate Program: Engineering Science and Mechanics (PHD) Keywords: Nonlinear acousticsgranular mediaultrasonicsDAETgeophysicsrelative humiditygrain shape File: Download Dissertation_Gao_final.pdf Committee Members: Albert Segall, Program Head/ChairChris Marone, Outside Unit & Field MemberParisa Shokouhi, Major Field MemberClifford Lissenden, Major Field MemberJacques Riviere, Chair & Dissertation Advisor