• Speaker: Rachel Domagalski, MSU
• Title: Validating and Extending Methods for Extracting the Backbone of Bipartite Projections
• Date: 04/29/2019
• Time: 3:00 PM - 4:00 PM
• Place: C517 Wells Hall

Networks are widely recognized as important for phenomena that span multiple disciplines including the diffusion of information (communication), the contagion of illness (public health), the passage of legislation (political science), the emergence of norms (sociology), the coordination of economic activities (economics & geography), the formation of relationships (developmental psychology), and detection of national security threats (intelligence). However, the challenges of collecting network data have limited the feasibility of network research in these areas. In this project, we will explore and refine the use of bipartite projections to validly infer otherwise unobserved or unobservable networks. Several formal methods for making such inferences have been proposed, however it remains unknown which models lead to valid inferences and under what circumstances. We use bipartite network data to systematically test, compare, and extend available models for inferring networks from bipartite projections.

• Speaker: Kesong Yan, MSU and Guangxi University of Finance and Economics
• Title: Local entropy for topological dynamical systems
• Date: 05/01/2019
• Time: 3:00 PM - 4:00 PM
• Place: C304 Wells Hall

In this talk, we will review the local entropy theory for topological dynamical systems.

• Speaker: Ian Jauslin, Princeton University
• Title: Time-evolution of electron emission from a metal surface
• Date: 05/02/2019
• Time: 11:00 AM - 12:00 PM
• Place: C517 Wells Hall

The electrons in a metal can be extracted from the metal by a variety of processes: for instance by applying a strong electric field (field emission), or shining an intense laser pulse (photoemission). In the case of field emission, the celebrated and widely used Fowler-Nordheim equation predicts a value for the current of electrons outside the metal. In this talk, I will show that the Fowler-Nordheim equation emerges as the long-time asymptotic solution of a Schrodinger equation with a realistic initial condition, thereby justifying the use of the Fowler Nordheim equation in real setups. As for photoemission, the expression for the current has been predicted by Faisal et al, and I will discuss ongoing work to show that this prediction emerges as the long-time asymptotic solution of a Schrodinger equation. In both cases, I will discuss the time scale of the convergence.

• Speaker: Jane Zimmerman, MSU
• Title: MTH 103A/B: Experiences from the classroom and future directions
• Date: 05/02/2019
• Time: 2:30 PM - 3:30 PM
• Place: C109 Wells Hall

No abstract available.