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DTSTART;TZID=America/New_York:20200121T103000
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DTSTAMP:20260408T051835
CREATED:20200109T221559Z
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SUMMARY:MEAM Seminar: "Plate Mechanical Metamaterials and their Applications"
DESCRIPTION:Recently\, we introduced the concept of plate mechanical metamaterials—cellular plates with carefully controlled periodic geometry and unique mechanical properties—as well as its initial realization in the form of freestanding corrugated plates made out of an ultrathin film. We used atomic layer deposition (ALD) and microfabrication techniques to make robust plates out of a single continuous ALD layer with cm-scale lateral dimensions and thicknesses between 25 and 100 nm\, creating the thinnest freestanding plates that can be picked up by hand. We also fabricated and characterized nanocardboard – plate metamaterials made from multiple layers of nanoscale thickness\, whose geometry and properties are reminiscent of honeycomb sandwich plates or corrugated paper cardboard. Ultralow weight\, mechanical robustness\, thermal insulation\, as well as chemical and thermal stability of alumina make plate metamaterials attractive for numerous applications\, including structural elements in flying microrobots and interstellar light sails\, high-temperature thermal insulation in energy converters\, photophoretic levitation\, as well as ultrathin sensors and resonators. I will briefly discuss our experimental progress on all these applications\, including demonstrations of extremely robust thermal insulators that can sustain a temperature difference of ~1000 K across a micron-scale gap\, hollow AFM cantilevers that offer greatly enhanced sensitivity and data acquisition rates\, and macroscopic plates that levitate when illuminated by light.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-plate-mechanical-metamaterials-and-their-applications/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200121T150000
DTEND;TZID=America/New_York:20200121T160000
DTSTAMP:20260408T051835
CREATED:20200117T205630Z
LAST-MODIFIED:20200117T205630Z
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SUMMARY:CIS Seminar: "Networked Systems in the Era of Programmable Dataplanes"
DESCRIPTION:Abstract:  \nEmerging networking architectures are allowing for flexible and reconfigurable packet processing at line rate both on the switch and the NIC. Despite their promising new functionality\, programmable switches and NICs are not all-powerful; they have limited state\, support limited types of operations\, and limit per-packet computation to operate at line rate. In this talk\, I will describe how to mask resource limitations using approximation techniques and new scheduling algorithms and how to build a general framework for exposing in-network computing capability to distributed applications. In addition to presenting case studies of optimizing networked systems\, I will reflect on the role of programmable dataplanes in datacenter computing.
URL:https://seasevents.nmsdev7.com/event/cis-seminar-networked-systems-in-the-era-of-programmable-dataplanes/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Computer and Information Science":MAILTO:cherylh@cis.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200122T150000
DTEND;TZID=America/New_York:20200122T160000
DTSTAMP:20260408T051835
CREATED:20191218T151547Z
LAST-MODIFIED:20191218T151547Z
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SUMMARY:CBE Seminar: "Collaboration and Competition Between Active Sheets for Self-Propelled Particles"
DESCRIPTION:Abstract: \nBiological species routinely collaborate for their mutual benefit or compete for available resources\, thereby displaying dynamic behavior that is challenging to replicate in synthetic systems. Here\, we use computational modeling to design microscopic\, chemically active sheets and self-propelled particles encompassing the appropriate synergistic interactions to exhibit bio-inspired “feeding”\, “fleeing” and “fighting”. This design couples two different mechanisms for chemically generating motion in fluid-filled microchambers: solutal buoyancy and diffusiophoresis. Catalyst-coated sheets\, which resemble crabs with four distinct “claws”\, convert reactants in solution into products\, and thereby create local variations in the density and chemical composition of the fluid. Via the solutal buoyancy mechanism\, the density variations generate fluid flows\, which modify the shape and motility of the “crabs”. Concomitantly\, the chemical variations propel the motion of the particles via diffusiophoresis and\, thus\, the crabs’ and particles’ motion becomes highly interconnected. For crabs with restricted lateral mobility\, these two mechanisms can be modulated to either drive a crab to catch and appear to “feed” on all the particles or enable the particles to “flee” from this sheet. Moreover\, by adjusting the sheet’s size and the catalytic coating\, two crabs can compete and “fight” over the motile\, diffusiophoretic particles. Alternatively\, the crabs can temporally “share” resources by shuttling the particles back and forth between themselves. With completely mobile sheets\, four crabs can collaborate to perform a function that one alone cannot accomplish. These findings provide design rules for creating chemically-driven soft robotic sheets that significantly expand the functionality of microfluidic devices.
URL:https://seasevents.nmsdev7.com/event/cbe-seminar-collaboration-and-competition-between-active-sheets-for-self-propelled-particles/
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:20200123T104500
DTEND;TZID=America/New_York:20200123T114500
DTSTAMP:20260408T051835
CREATED:20200120T000818Z
LAST-MODIFIED:20200120T000818Z
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SUMMARY:MSE Faculty Candidate Seminar: "Defect Structure Process Maps for Laser Powder Bed Fusion Additive Manufacturing"
DESCRIPTION:Additive manufacturing (AM) greatly expands the design freedom and near-net shape production of metallic components across multiple length scales. However\, defects arising from starting materials\, processing conditions\, and post-processing may significantly affect the structural integrity and operational performance of metal AM parts. This paper seeks to elucidate common defects and defect formation mechanisms encountered in typical laser powder bed fusion (LPBF) AM processes. While the defect structures of conventional joining processes such as laser welding have been studied extensively\, this talk primarily focuses on the nature of porosity transfer to the finished part exclusively for metal AM powder bed processing techniques. Multiple starting powders and analysis methods are summarized which demonstrate that the manifestation of defects within metal AM builds largely stems from the particular choice of process settings\, with some influence of powder feedstock choice and post-processing heat treatments. Practical build strategies to limit the occurrence of defects by the use of process mapping and geometric modeling are also evaluated utilizing this fundamental understanding of defect formation. Such explorations may enable the validation and calibration of models to permit process qualification without the reliance on costly trial and error type experimentation currently employed.
URL:https://seasevents.nmsdev7.com/event/mse-faculty-candidate-seminar-defect-structure-process-maps-for-laser-powder-bed-fusion-additive-manufacturing/
LOCATION:Auditorium\, LRSM Building\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
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