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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210802T120000
DTEND;TZID=America/New_York:20210802T130000
DTSTAMP:20260406T165100
CREATED:20210520T140001Z
LAST-MODIFIED:20210520T140001Z
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SUMMARY:PSOC Webinar: Lindsey Fernandez & Mai Wang
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 \nLindsey Fernandez 12:00-12:30 PM \nMai Wang 12:30-1:00 PM
URL:https://seasevents.nmsdev7.com/event/psoc-webinar-lindsey-fernandez-mai-wang/
LOCATION:https://upenn.zoom.us/j/96715197752
CATEGORIES:Seminar,Doctoral,Graduate,Student
ORGANIZER;CN="Bioengineering":MAILTO:be@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210802T133000
DTEND;TZID=America/New_York:20210802T153000
DTSTAMP:20260406T165100
CREATED:20210707T132644Z
LAST-MODIFIED:20210707T132644Z
UID:10006819-1627911000-1627918200@seasevents.nmsdev7.com
SUMMARY:BE Doctoral Dissertation: "Quantitative Methods for Guiding Epilepsy Surgery from Intracranial EEG" (John Bernabei)
DESCRIPTION:The Department of Bioengineering at the University of Pennsylvania and Dr. Brian Litt are pleased to announce the Doctoral Dissertation Defense of John Bernabei.\n\n \nTitle: Quantitative methods for guiding epilepsy surgery from intracranial EEG\nDate: August 2\, 2021\nTime: 1:30 PM \nLocation: 337 Towne Building\n \nThe defense will also be available via zoom at the link below:\nhttps://upenn.zoom.us/j/95425194465
URL:https://seasevents.nmsdev7.com/event/be-doctoral-dissertation-quantitative-methods-for-guiding-epilepsy-surgery-from-intracranial-eeg-john-bernabei/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Doctoral,Graduate,Student,Dissertation or Thesis Defense
ORGANIZER;CN="Bioengineering":MAILTO:be@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210803T103000
DTEND;TZID=America/New_York:20210803T120000
DTSTAMP:20260406T165100
CREATED:20210726T195154Z
LAST-MODIFIED:20210726T195154Z
UID:10006839-1627986600-1627992000@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Exploiting Interface Patterning for Adhesion Control"
DESCRIPTION:Surface force-mediated adhesion\, e.g. van der Waals forces\, is critical for direct bonding of bulk solids in the absence of an adhesive layer. However\, no two surfaces are ideally flat or perfectly conformal due to surface roughness or intentional patterning. When in the adhered state\, non-zero surface tractions arise wherever the local separation of the surfaces differs from an intrinsic equilibrium separation\, for which surface tractions vanish\, hence regions of tensile and compressive loads are induced across the interface. A fundamental understanding of such imperfect adhesion is important and unlocks opportunities to control interfacial strength and toughness in various applications including MEMS/NEMS\, micro-transfer printing\, and processes to manufacture advanced 3D integrated-circuits. The aim of this work is to understand the fundamentals of direct adhesion of non-conformal surfaces by examining the interplay of (1) the intrinsic adhesive properties of traction-separation relation (TSR)\, (2) interface geometry\, and (3) elastic deformation of the adhered bulk solids. The TSR we adopted accounts for strong repulsion when the interface separation is less than the equilibrium separation\, and only the normal surface tractions were considered. The effective TSR properties\, including the effective adhesion strength and work of separation\, are determined from numerical calculations. Simple closed-form solutions are obtained when assuming rigid bulk solids. A finite element model utilizing cohesive elements in a periodic cell was constructed to study cases with non-uniform deformation in the elastic solids under pure normal separation without shear.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-exploiting-interface-patterning-for-adhesion-control/
LOCATION:Zoom – Email MEAM for Link\, peterlit@seas.upenn.edu
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210803T120000
DTEND;TZID=America/New_York:20210803T130000
DTSTAMP:20260406T165100
CREATED:20210709T201412Z
LAST-MODIFIED:20210709T201412Z
UID:10006831-1627992000-1627995600@seasevents.nmsdev7.com
SUMMARY:MEAM PhD Thesis Defense: "Controlled Levitation of Nanostructured Thin Films for Sun-Powered Near-Space Flight"
DESCRIPTION:Earth’s mesosphere is the least studied part of our atmosphere. The data it contains within itself can help develop more comprehensive and accurate models of the atmosphere and can help us understand our climate better. The main challenge before scientists is the inaccessibility of this region. The pressure is not high enough for aircraft and balloons and it is too high for satellites. There are remote sensing methods as well as transient rockets to collect data\, though they are expensive and collect data for a few minutes at a time. In this thesis\, we present photophoresis or light-driven motion as an alternative flight mechanism for long-duration access to this region. \nPhotophoretic force has long been studied for micron scale particles. However\, in order to leverage photophoresis to levitate large microflyers capable of carrying useful payloads under sunlight\, the structure of microflyers need to be ultralight\, with areal densities of no more than a few g/m2. Creating a large scale structure with thicknesses that result in temperature difference and weigh only a few g/m2 is a challenge. The approach we present in this thesis is to generate photophoretic force that leverages heat transfer between gas molecules and surface molecules/structure. By altering this heat transfer on either side of a thin disc we can generate large photophoretic forces that can levitate cm-scale samples with several milligrams of payload. \nIn this work we propose and validate a predictive theoretical framework that accounts for conductive\, convective\, and radiative heat transfer and determines the temperature of illuminated thin disc microflyers as well as their lift force and payload capacity with sizes ranging from millimeters to centimeters over pressures ranging from 10 to 120 pascals. \nWe used cheap and fast methods to fabricate cm-scale thin disc microflyers with areal density of ~ 1 g/m2 and test them in vacuum and under variable light intensity. We fabricated four generations of microflyers starting by dropcasting carbon nanotubes onto thin disc-shaped mylar films. Atomic layer deposition and laser micromachining enabled stiffer continuous and porous samples to be created as well. Moreover\, we used different microfabrication techniques to improve the performance of microflyers and increase their range of operation. Lastly\, we used our validated theoretical model to predict the performance of the microflyers in upper atmosphere under natural sunlight\, and we further propose different approaches that can lead to better performance and higher payload carrying capabilities.
URL:https://seasevents.nmsdev7.com/event/meam-phd-thesis-defense-controlled-levitation-of-nanostructured-thin-films-for-sun-powered-near-space-flight/
LOCATION:Zoom – Email MEAM for Link\, peterlit@seas.upenn.edu
CATEGORIES:Doctoral,Dissertation or Thesis Defense
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210806T103000
DTEND;TZID=America/New_York:20210806T120000
DTSTAMP:20260406T165100
CREATED:20210727T132132Z
LAST-MODIFIED:20210727T132132Z
UID:10006840-1628245800-1628251200@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "A Differential Homogenization Framework for Precipitation Strengthened Metals"
DESCRIPTION:Precipitation-strengthened alloys are a commercially important class of materials because their mechanical properties can be altered by changing the microstructure through heat-treatment. Specifically\, precipitates are introduced into the bulk (matrix) material to interact with dislocations and affect their mobility. It is known that the size\, shape\, orientation and stiffness of the precipitates\, which can be altered during the age-hardening process\, have a strong influence on the alloy and its plastic behavior. In this talk\, I will discuss a differential homogenization framework that has been developed to model elasto-viscoplastic particulate composites which exhibit hardening at the local scale. The new homogenization estimates incorporate the second moments of the local hardening fields and improve on existing formulations which only take into account the first moment. First\, we’ll consider the simple case of linear viscoelasticity and show that by using differential equations instead of difference equations\, the new formulation is more robust than earlier incremental approaches and recovers exact results for certain classes of composites. Next\, we provide estimates for creeping single crystals with elastic particles and find that neglecting the elasticity of the crystal\, an assumption which is typically made\, can lead to an overestimation of the effective creep-rate. Last\, we examine the role of microstructure on the effective workhardening of precipitation-strengthened crystals. We focus on the interplay between crystallographic and morphological anisotropy and how these can reduce the overall anisotropy\, as well as how the choice of the crystal matrix(either FCC or HCP) leads to markedly different work-hardening behavior.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-a-differential-homogenization-framework-for-precipitation-strengthened-metals/
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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