My PhD research focused on the interaction between the stratosphere and the troposphere and the surface impacts of that interaction. In particular, I have studied sudden stratospheric warmings: their impacts relative to those of the El Niño-Southern Oscillation, their interactions with ozone chemistry and transport, and their variability. I have also worked on the proposed connection between the North Atlantic Oscillation and the 11-year solar cycle. My PhD advisors were Prof. Lorenzo Polvani (Columbia University) and Dr. Gabriel Chiodo (ETH Zurich).
Much of my undergraduate research was in graph labelings, particularly L(d,1) and radio k-labelings, as part of the Babson/Olin Graph Theory Research Group supervised by Profs. Denise Troxell and Nathan Karst. My undergraduate senior capstone project was sponsored by Boston Scientific Corporation and concerned mathematical modeling of different kinds of deformations of gastrointestinal stents.
If you're interested in more details about any of this work, feel free to email me at joehrlei at fitchburgstate dot edu.
Much of my undergraduate research was in graph labelings, particularly L(d,1) and radio k-labelings, as part of the Babson/Olin Graph Theory Research Group supervised by Profs. Denise Troxell and Nathan Karst. My undergraduate senior capstone project was sponsored by Boston Scientific Corporation and concerned mathematical modeling of different kinds of deformations of gastrointestinal stents.
If you're interested in more details about any of this work, feel free to email me at joehrlei at fitchburgstate dot edu.