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DTSTART;TZID=America/New_York:20210726T120000
DTEND;TZID=America/New_York:20210726T130000
DTSTAMP:20260406T184805
CREATED:20210520T135334Z
LAST-MODIFIED:20210520T135334Z
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SUMMARY:PSOC Webinar: Indrajit Tah & David Li
DESCRIPTION:Join Zoom Meeting: \nhttps://upenn.zoom.us/j/99334915941?pwd=eDRXV1lITDlySXFyRHUyUzdmRldoQT09 \nMeeting ID: 993 3491 5941 \nPasscode: 189247 \nPSOC@Penn Summer Webinars 2021 \nContact manu@seas.upenn.edu with any questions \nIndrajit Tah 12:00-12:30 PM \nDavid Li 12:30-1:00 PM
URL:https://seasevents.nmsdev7.com/event/psoc-webinar-indrajit-tah-david-li/
LOCATION:https://upenn.zoom.us/j/96715197752
CATEGORIES:Seminar,Postdoctoral
ORGANIZER;CN="PSOC":MAILTO:manu@seas.upenn.edu
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DTSTART;TZID=America/New_York:20210727T103000
DTEND;TZID=America/New_York:20210727T120000
DTSTAMP:20260406T184805
CREATED:20210712T181144Z
LAST-MODIFIED:20210712T181144Z
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SUMMARY:MEAM Seminar: "Some Investigations of Phase Transitions in Rod-like Macro-molecules and Fibrous Gels"
DESCRIPTION:Stress-induced solid-to-solid phase transitions form a large class of phase transitions in nature. They occur in materials that can exhibit different crystal structures under different conditions (stress and temperature)\, and when the stress and temperature condition changes\, the material may undergo a transformation from one phase to another. Despite its considerable potential in application\, some fundamental aspects about the basic physical mechanisms of stress-induced solid–solid phase transitions remain poorly understood. In this work we are particularly interested in phase transitions in macromolecules and fibrous gels. \nFirst\, we conduct Langevin dynamics calculations on a chain of masses and bistable springs in a viscous fluid and extract a temperature dependent kinetic relation by observing that the dissipation at a phase boundary can be estimated by performing an energy balance. Using this kinetic relation\, we solve boundary value problems for a bistable bar immersed in a constant temperature bath and show that the resultant force-extension relation matches very well with the Langevin dynamics results. We estimate the force fluctuations at the pulled end of the bar due to thermal kicks from the bath by using a partition function. We also show rate dependence of hysteresis in cyclic loading of the bar arising from the stick-slip kinetics. \nSecond\, we use a double-well stored energy function in a chemo-elastic model of gels to capture the existence of two phases of the network. We model cyclic compression/decompression experiments on fibrous gels and show that they exhibit propagating interfaces and hysteretic stress-strain curves that have been observed in experiments. We can capture features in the rate-dependent response of these fibrous gels without recourse to finite element calculations.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-some-investigations-of-phase-transitions-in-rod-like-macro-molecules-and-fibrous-gels/
LOCATION:Zoom – Email MEAM for Link\, peterlit@seas.upenn.edu
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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DTSTART;TZID=America/New_York:20210728T161500
DTEND;TZID=America/New_York:20210728T171500
DTSTAMP:20260406T184805
CREATED:20210723T184204Z
LAST-MODIFIED:20210723T184204Z
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SUMMARY:Climate & Diplomacy: How cities around the world collaborate on science-based climate solutions
DESCRIPTION:PIRE REACT Summer Student Program presents a talk for summer student researchers in STEM and their graduate student mentors; all are welcome. \n“Climate & Diplomacy: How cities around the world collaborate on science-based climate solutions.”  The speaker\, Ms. Lolita Jackson\, is a Penn Engineering alum and now with Sustainable Dev. Capital\, LLP (recent interview in a Scotland-based media forum: https://www.holyrood.com/inside-politics/view\,making-change-happen-interview-with-lolita-jackson and PWH bio: https://global.upenn.edu/perryworldhouse/person/lolita-k-jackson).
URL:https://seasevents.nmsdev7.com/event/climate-diplomacy-how-cities-around-the-world-collaborate-on-science-based-climate-solutions/
LOCATION:PA
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