1. Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
2. Department of Civil and Environmental Engineering, and Center for Nonlinear Analysis, Carnegie Mellon University, Pittsburgh, PA, USA
3. Department of Mathematical Sciences, and Center for Nonlinear Analysis, Carnegie Mellon University, Pittsburgh, PA, USA
4. Chemical Physics Interdisciplinary Program, and The Liquid Crystal Institute, Kent State University, Kent, OH, USA