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December 2021

MEAM Seminar: “Continuum Mechanics of Non-equilibrium Phenomena: A Journey Through Space and Time Scales”

December 7 at 10:00 AM - 11:30 AM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

The fascinating diversity of material behavior at the macroscopic scale, including plasticity, phase transformations, viscoelasticity or diffusion, can only emerge from the underlying atomistic or particle behavior. Yet, the direct connection between these two scales for non-equilibrium phenomena remains an extremely challenging quest from both a theoretical and computational perspective. This knowledge gap currently hinders predictive simulations and material discovery, and leads to large economic losses and barriers to innovation in many industrial sectors. In this talk, we will discuss…

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MEAM Seminar: “Architected Nanoscale Plates for Thermionic Energy Conversion and Relativistic Interstellar Travel”

December 14 at 10:00 AM - 11:30 AM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

Architected plates feature geometrical patterns that provide advantageous mechanical properties, such as an enhanced bending stiffness or a reduced tendency to tear. In this talk I will introduce our research group’s multiscale hexagonally patterned corrugated plates, which have nano-scale film thicknesses, micron-scale total heights, and square-centimeter-scale lateral area dimensions. I will first explain how we use these plates in direct thermionic heat-to-electricity generators and show that new corrugation modalities provide several-fold reductions in the plates’ thermal conductivity, leading to greater…

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January 2022

MEAM Seminar: “‘Tiny-but-tough’ GaN- and Graphene-based Nanoelectronics for Extreme Harsh Environments”

January 25, 2022 at 10:00 AM - 12:00 PM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

Gallium nitride (GaN) nanoelectronics have operated at temperatures as high as 1000°C making it a viable platform for robust space-grade (“tiny-but-tough”) electronics and nano-satellites. Even with these major technological breakthroughs, we have just begun the “GaN revolution.” New communities are adopting this nanoelectronic platform for a multitude of emerging device applications including the following: sensing, energy harvesting, actuation, and communication. In this talk, we will review and discuss the benefits of GaN’s two-dimensional electron gas (2DEG) over silicon’s p-n junction…

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February 2022

PICS Colloquium “Driving physics of inverted flag flapping”

February 25, 2022 at 2:00 PM - 3:00 PM
Zoom – email kathom@seas.upenn.edu

Abstract: Fluid-structure interaction (FSI) is ubiquitous in the natural and engineered world, and a better understanding of FSI systems can aid in the design of renewable energy harvesting technologies, bio-inspired propulsion vehicles, and biomedical devices (to name a few applications). In this talk we will investigate “inverted” flag flapping, in which the flag is clamped at its trailing edge with respect to the incoming uniform flow. This canonical system exhibits a diverse range of behavioral regimes, including flapping with amplitudes comparable to the…

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