1. Cockrell School of Engineering, University of Texas at Austin, Austin, USA
2. School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, People’s Republic of China
3. School of arts and sciences, Brandeis University, Waltham, USA
4. Nanjing Foreign Languages School, Nanjing, People’s Republic of China
5. College of Art and Science, Vanderbilt University, Nashville, USA
6. Keystone Academy, Beijing, People’s Republic of China