Past Events

  • Department Colloquium:

    Andrew Hamilton, University of Colorado Boulder

  • Basic Vacuum and Leak Detection Principles

    Singh Center for Nanotechnology 3205 Walnut St Room 221

    Rob Wilson (Sales/Systems Engineer from Pascal Technologies)

    Short Course which will cover topics

    * Pressure, measurement, viscous flow, molecular flow

    * The common ways to create a vacuum - different pumps and where they
    are used

    * Different kinds of pressure gauges and where they are used
    * Leak detectors - leak detection methods - real leaks Vs. virtual leaks
    * Deposition techniques

    Rob's presentation will be followed by a Q&A period.

    --Lunch provided--

  • Condensed Matter seminar: "Grain Growth: materials, curvature flow, topology"

    DRL A4

    David Srolovitz, Penn Materials Science & Engineering

    Grain growth is the process through which a polycrystalline material coarsens.  Large grains grow, small grains shrink and disappear; the average grain size increases. This process is driven by the surface tension of the grain boundaries.  The idealization of this is simply mean curvature flow on a cellular network. Beautiful exact results in 2d, derived by von Neumann and Mullins, take the problem from geometry to topology. Several years ago, we extended these results to all dimensions.

  • Astrophysics and Cosmology Seminar

    DRL A6

    Stefano Anselmi (Case Western)

  • Condensed Matter seminar: "High-dimensional surprises near the glass and the jamming transitions"

    DRL A4

    Patrick Charbonneau, Duke University

    The glass problem is notoriously hard and controversial. Even at the mean-field level, there is little agreement about how a fluid turns sluggish while exhibiting but unremarkable structural changes. It is clear, however, that the process involves self-caging, which provides an order parameter for the transition. Contrasting caging and force balance also suggests how one can embed jamming within the glass description.

  • Astrophysics and Cosmology Seminar

    DRL A6

    Paul Sutter (Ohio State University/IAP)

  • Department Colloquium

    Room A4, DRL

    Scott Tremaine, Institute for Advanced Study - RITTENHOUSE LECTURE
  • Evolution Cluster Faculty Search Seminar: "The Rise and Fall of Fishes: How Macroecology and Global Events Shape Vertebrate Evolution"

    Lynch Lecture Hall (Chemistry)

    Lauren Sallan, University of Michigan

    Biological evolution was originally understood as a gradual, internally-driven process, and standing biodiversity entirely the result of the slow accumulation of positive changes. It is now clear that macroevolution (above species level) proceeds in booms and busts. It is influenced by emergent multiscale processes, which can turn short-term positive traits into long-term negatives and alter rates of evolutionary change.

  • Evolution Cluster Faculty Search Seminar: "Life and Death in a Petersham Cemetery: Dispersal and Demography Among the Fungi"

    Fagin Hall 116

    Anne Pringle, Harvard University

    Fungi are uniquely organized biological systems: apparently immortal, growing with modular and indeterminate body architectures, and able to use a range of seemingly unusual genetic mechanisms, including parasexuality, to generate genetic diversity. I use fungi as tools to test core principles of evolution and ecology. The dispersal of fungi is often perceived as passive; spores appear to drift with wind or water. In this talk I will describe experiments to challenge that perception; in fact, fungi actively manipulate local environments to reach new habitats.

  • Astrophysics and Cosmology Seminar

    DRL A6

    Meng Su