Past Events

  • Astrophysics and Cosmology Seminar

    DRL A6

    Jenny Greene (Princeton University)

  • Condensed Matter seminar: "Effects of substrate geometry on neuronal growth"

    DRL A4

    Cristian Staii, Tufts University

    Physical stimuli (stiffness of the growth substrate, gradients of various molecular species, geometry of the surrounding environment, traction forces etc.) play a key role in the wiring up of the nervous system. I will present a systematic experimental and theoretical investigation of neuronal growth on substrates with asymmetric geometries and textures. The experimental results show unidirectional axonal growth on these substrates.

  • "Physical Principles Underlying the Fractional Quantum Hall Effect"

    Towne 337

    Professor Juerg Froelich, Institute for Advanced Study


  • 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