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DTSTART;TZID=America/New_York:20190416T103000
DTEND;TZID=America/New_York:20190416T120000
DTSTAMP:20260409T004646
CREATED:20190305T163725Z
LAST-MODIFIED:20190305T163725Z
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SUMMARY:MEAM Seminar: "Wrinkles\, Spaghetti\, and Knots"
DESCRIPTION:Buckling\, twisting and fracture are ubiquitous phenomena that\, despite having been studied for centuries\, still pose many interesting conceptual and practical challenges. In this talk\, I will summarize recent theoretical and experimental work that aims to understand the role of curvature and torsion in wrinkle pattern selection\, fragmentation cascades and knots. First\, we will show how changes in curvature can induce phase transitions and topological defects in the wrinkling patterns on curved elastic surfaces. Thereafter\, we will revisit an observation by Feynman who noted that dry spaghetti appears to fragment into at least three (but hardly ever two) pieces when placed under large bending stresses. Using a combination of experiments\, simulations and analytical scaling arguments\, we will demonstrate how twist can be used to control binary fracture of brittle elastic rods. Finally\, in the last part\, we will try to shed some light on how topology and torsion affect the stability of knots.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-wrinkles-spaghetti-and-knots/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190417T110000
DTEND;TZID=America/New_York:20190417T120000
DTSTAMP:20260409T004646
CREATED:20190412T133856Z
LAST-MODIFIED:20190412T133856Z
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SUMMARY:MEAM/MSE Special Seminar: "Scalable Functional Phase Change Materials for Displays and Photonic Non-von Neumann Computing"
DESCRIPTION:In electronics\, doping silicon results in one of the most versatile functional materials ever employed. The pursuit of such functional materials in the optical domain is an area of great interest in the photonics community. I hope to convince you that whatever route photonics takes\, a class of materials known as phase change materials\, will play a key role in its commercialization. These materials can be addressed electrically\, and whilst this can be used to control optical signals on photonic circuits this can also be used to create displays and smart windows. In this talk\, I hope to give an overview of these applications of these materials with a view towards their near-term applications in displays\, and their longer-term potential in integrated photonic memories to photonic machine-learning hardware components\, with a few of our recent results in this area.
URL:https://seasevents.nmsdev7.com/event/meam-mse-special-seminar-scalable-functional-phase-change-materials-for-displays-and-photonic-non-von-neumann-computing/
LOCATION:Reading Room\, LRSM\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190417T150000
DTEND;TZID=America/New_York:20190417T160000
DTSTAMP:20260409T004646
CREATED:20190110T203826Z
LAST-MODIFIED:20190110T203826Z
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SUMMARY:CBE Seminar: "Lipid-like Materials for RNA Delivery: A How-to Guide for Hacking Gene Expression"
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/cbe-seminar-lipid-like-materials-for-rna-delivery-a-how-to-guide-for-hacking-gene-expression/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190419T140000
DTEND;TZID=America/New_York:20190419T150000
DTSTAMP:20260409T004646
CREATED:20190325T133442Z
LAST-MODIFIED:20190325T133442Z
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SUMMARY:PICS Seminar: "Topology\, Geometry\, and Fracture in Networked Materials: A Tale of Scales"
DESCRIPTION:The skeleton of many natural and artificial structures may be abstracted as networks of nonlinearly interacting elements. Examples include rubber\, gels\, soft tissues\, and lattice materials. Understanding the multiscale nature of deformation and failure of networked structures hold key for uncovering origins of fragility in many complex systems including biological tissues and enables designing novel materials. \nI will start by an overview of our prior work on modeling polymer chains with sacrificial bonds and hidden length; a topological feature that was previously hypothesized to be responsible for increased toughness and fracture resistance in animal bone. Our model combines nonlinear entropic elasticity with transition state theory for bond breakage and formation to predict rate dependence and time dependent healing in these systems in the quasi-1D limit. I will then introduce an extension of this model  to a discrete 2D setting (at the scale of 10s of microns) that enables exploring interplay of topological and geometrical features such as coordination number\, cross linking density\, and disorder with mechanical deformation and fracture. Specifically\, we identify a non-monotonic rate dependence of the reaction force and dissipated energy as well as a transition in mode of failure from diffusive to localized with increased pulling rate. Furthermore\, we show that networks with small-world architectures\, balancing clustering and average path length\, may lead to an optimum fracture toughness. \nTo generalize our results to larger scales relevant for engineering and material science applications\, I will discuss our recent efforts in adopting an extended version of the Quasi-Continuum (QC) method to studying polymer networks across scales. In regions of high interest\, for example near defects or cracks\, each polymer chain is idealized using the worm like chain model. Away from these imperfections\, the network structure is computationally homogenized\, using Hill-Mandell’s principle\, to yield an anisotropic material tensor consistent with the underlying network structure. Dynamic adaptivity provides a seamless transition across the two models. Overall\, the proposed method provides a multi-resolution capability by retaining explicit representation of small scale heterogeneities and topological features\, where they matter near the crack tips\, while still accurately accounting for bulk elasticity and loading. We show several examples verifying our approach and illustrate the potential of the method for testing the influence of small scale features in controlling the macroscopic response.  We discuss the implications of our findings for the analysis and design of tough networks.
URL:https://seasevents.nmsdev7.com/event/pics-seminar-topology-geometry-and-fracture-in-networked-materials-a-tale-of-scales/
LOCATION:Raisler Lounge (Room 225)\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
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