Self-similar disk packings as model spatial scale-free networks

The network of contacts in space-filling disk packings, such as the Apollonian packing, are examined. These networks provide an interesting example of spatial scale-free networks, where the topology reflects the broad distribution of disk areas. A wide variety of topological and spatial properties of these systems are characterized. Their potential as models for networks of connected minima on energy landscapes is discussed.Comment: 13 pages, 12 figures; some bugs fixed and further discussion of higher-dimensional packing

CDW, Superconductivity and Anomalous Metallic Behavior in 2D Transition Metal Dichalcogenides

We propose a theory for quasi-two-dimensional transition metal dichalcogenides that provides a unified microscopic picture of the charge density wave (CDW) and superconducting phases. We show, based on the electron-phonon coupling and Fermi surface topology, that a CDW order parameter with six-fold symmetry and nodes (f-wave) gives a consistent description of the available experimental data. The elementary excitations in the CDW phase are Dirac electrons. The superconducting state has its origin on the attractive interaction mediated by phonons. The theory predicts strong deviations from Fermi liquid theory in the CDW phase.Comment: 4 pages, 3 figure

Integrating Community Service Learning into the Murray State University Archaeology Program

Abstract Since 2008, Murray State University (MSU) archaeology faculty in the Geosciences Department have begun to implement community service learning into their archaeology curriculum. Community service learning allows students to take what they learn in the classroom and apply it to real-world problems while simultaneously addressing needs within their local and regional community. At MSU, service learning projects implemented in the archaeology curriculum include conducting phase I cultural resources inventories for the City of Murray, conducting geophysical exploration of unmarked cemetery graves for the City of Cadiz, and bundling human remains for reburial at Wickliffe Mounds State Historic Site. This paper describes these initiatives and evaluates their positive effect on student learning, civic engagement, and community awareness; student-faculty interaction with public stakeholders; and public awareness and perception of archaeological resources