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MEAM Ph.D. Thesis Defense: “Relationships Between Structure, Dynamics, and Flow in Sheared Amorphous Materials”

Zoom - Email MEAM for Link peterlit@seas.upenn.edu

Amorphous solids, those composed of haphazardly arranged constituents, are found everywhere from our windows as silicate glass, in the ground and foundations as mud and concrete, and our grocery stores as granular piles of oranges. Even though they can be found over a huge range of length scales, it remains a challenge to systematically design […]

PSOC@Penn Seminar: Morgan Huse, PhD

Raisler Lounge (Room 225), Towne Building 220 South 33rd Street, Philadelphia, PA, United States

Physical Sciences in Oncology Center PSOC@Penn Spring 2022 Hybrid-Seminar Series Towne 225 / Raisler Lounge @ Noon (EST) For Zoom link , please contact manu@seas.upenn.edu

CBE PhD Dissertation Defense | “Understanding the relationship between clot contraction and platelet biology under hemodynamic conditions”

Greenberg Lounge (Room 114), Skirkanich Hall 210 South 33rd Street, Philadelphia, PA, United States

Abstract:  "As thrombosis proceeds, platelets in a clot can expose phosphatidylserine (PS), providing a negatively charged surface for thrombin generation. These PS+ platelets have been shown to sort to the perimeter of platelet masses via platelet contraction. However, it remains unclear how thrombin and fibrin affect PS+ platelet sorting within a clot. We used an […]

CBE PhD Dissertation Defense | “The role of clot structure and mechanics on hemodynamics and pharmacology”

Greenberg Lounge (Room 114), Skirkanich Hall 210 South 33rd Street, Philadelphia, PA, United States

Abstract:  "Hemostatic clots have a core/shell hierarchy comprised of a P-selectin positive core surrounded by a P-selectin negative shell. A new human blood microfluidic assay utilizing a 2-stage assay was developed to interrogate core/shell mechanics. By first perfusing whole blood over a collagen/TF surface and then swapping out the blood for buffer, we were able […]

MEAM Seminar: “The Statistical Mechanics of Granular Clogging”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

The gravity-driven flow of grains from a hole in a hopper is an iconic granular phenomenon. It’s different from a fluid in that the rate is independent of fill height, and more spectacularly so in that it can suddenly and unexpectedly clog. How does the susceptibility to clogging decrease with increasing hole size, and is […]

MEAM Ph.D. Thesis Defense: “Metal and Air Generate Power for Robots”

Zoom - Email MEAM for Link peterlit@seas.upenn.edu

In many cases, the size and weight of energy storage technologies required to power robotic systems are too large or massive for a robot to carry, leading to limited operational times and long recharging times over which the robot remains unused. Computer-free autonomous decision making based on environmental cues provides exciting alternatives to classic control […]

MEAM Ph.D. Thesis Defense: “Mechanical Properties of Fibrous Network Materials”

Zoom - Email MEAM for Link peterlit@seas.upenn.edu

We discuss mechanical behavior of specific fibrous network materials, including the evolution of tension in fibrin clots, compression of pulmonary emboli, and fracture of Whatman filter paper. The first material, fibrin clots, consist of random networks of fibrin fibers. When clots form by polymerization they develop tensile pre-stresses. We construct a mathematical model for the […]

Spring 2022 GRASP SFI: Georgios Georgakis, University of Pennsylvania, “Cross-modal Map Learning for Vision and Language Navigation”

Levine 512

*This will be a HYBRID Event with in-person attendance in Levine 512 and Virtual attendance via Zoom We consider the problem of Vision-and-Language Navigation (VLN) in previously unseen realistic indoor environments. Arguably, the biggest challenge in VLN is grounding the natural language to the visual input. The majority of current methods for VLN are trained end-to-end […]

CBE Seminar: John A. Quinn Distinguished Lecture – “Molecular and Colloidal Interactions in Water”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

Abstract Life occurs in water, and water-mediated interactions are central to biomolecular assembly processes.  Synthetic materials as common as soap and shampoo also rely on water-mediated interactions.  This presentation will describe experiments that highlight our lack of understanding of interactions in water.  The opportunity to formulate a refined set of design rules for self-assembly of […]