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DTSTART;TZID=America/New_York:20191105T103000
DTEND;TZID=America/New_York:20191105T120000
DTSTAMP:20260408T112303
CREATED:20191014T183451Z
LAST-MODIFIED:20191014T183451Z
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SUMMARY:MEAM Seminar: "Multi-Stable Morphing Structures"
DESCRIPTION:Variable geometry “morphing” structures can achieve different geometric configurations through overall deformation\, but usually many actuators are required for shape control. In this talk we consider a particular type of morphing structure that is able to switch configuration with only a few actuators. It is based on the concept of embedding by design local energy minima in the configuration space of the structure. A general bar and plate structure connected by frictionless hinges can be made locally stable in a set of chosen target configurations by attaching extensional and rotational springs to the structure. The unstressed lengths and angles of the springs\, as well as their stiffnesses\, are the design parameters. We present a general theory to formulate the required equilibrium and stability conditions. Solutions of these equations provide specific values of the spring properties that correspond to local energy minima in all of the target configurations. Applications to reconfigurable antennas are also presented.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-multi-stable-morphing-structures/
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191105T110000
DTEND;TZID=America/New_York:20191105T120000
DTSTAMP:20260408T112303
CREATED:20190806T152650Z
LAST-MODIFIED:20190806T152650Z
UID:10006261-1572951600-1572955200@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Metasurface Computational Imaging"
DESCRIPTION:Modern image sensors consist of systems of cascaded and bulky spherical optics for imaging with minimal aberrations. While these systems provide high-quality images\, the improved functionality comes at the cost of increased size and weight. One route to reduce a system’s complexity is via computational imaging\, in which much of the aberration correction and functionality of the optical hardware is shifted to post-processing in the software realm. Alternatively\, a designer could miniaturize the optics by replacing them with diffractive optical elements\, which mimic the functionality of refractive systems in a more compact form factor. Metasurfaces are an extreme example of such diffractive elements\, in which quasiperiodic arrays of resonant subwavelength optical antennas impart spatially-varying changes on a wavefront. While separately both computational imaging and metasurfaces are promising avenues toward simplifying optical systems\, a synergistic combination of these fields can further enhance system performance and facilitate advanced capabilities. In this talk\, I will present a method to combine these two techniques to perform full-color imaging across the whole visible spectrum [1]. I will also discuss the use of computational techniques to design new metasurfaces [2]\, and using metasurfaces to perform computation on wavefronts\, with applications in optical information processing and sensing. \n \nFigure: (a) Hybrid cubic-quadratic metasurface; (b) Using the metasurface and computational imaging we demonstrated full-color imaging; (c) We developed inverse design methodologies for metasurfaces made of dielectric spheres. \nReferences: [1] S. Colburn\, A. Zhan\, and A. Majumdar\, “Metasurface optics for full-color computational imaging\,” Science Advances\, vol. 4\, 2018. [2] A. Zhan\, T. K. Fryett\, S. Colburn\, and A. Majumdar\, “Inverse design of optical elements based on arrays of dielectric spheres\,” Applied Optics\, vol. 57\, pp. 1437-1446\, 2018/02/20 2018.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-arka-majumdar/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191105T150000
DTEND;TZID=America/New_York:20191105T160000
DTSTAMP:20260408T112303
CREATED:20191029T152743Z
LAST-MODIFIED:20191029T152743Z
UID:10006326-1572966000-1572969600@seasevents.nmsdev7.com
SUMMARY:CIS Seminar: "Contesting Secure Development to Understand Security Mistakes"
DESCRIPTION:Abstract:  \nWith the ongoing\, frequent disclosure of the existence and exploitation of security vulnerabilities\, one might wonder: How can we can build software that is more secure? In an attempt to focus educational attention on this question\, and gather empirical evidence at the same time\, we developed the Build it\, Break it\, Fix it (BIBIFI) security-oriented programming contest. In BIBIFI\, teams aim to build specified software that should be correct\, efficient\, and secure. These goals mimic those of the real world. Security is tested when teams attempt to break other teams’ submissions. Winners are chosen from among the best builders and the best breakers. BIBIFI was designed to be open-ended — teams can use any language\, tool\, process\, etc. that they like.\n\nWe ran three 6-week contests involving a total of 156 teams from across the world\, and three different programming problems. Most participants had previous development experience and security education. Quantitative analysis from these contests found several interesting trends. For example\, the most efficient build-it submissions used C/C++\, but submissions coded in a statically-type safe language were 11× less likely to have a security flaw than C/C++ submissions. A manual\, in-depth qualitative analysis (using iterative open coding) of the vulnerabilities in 76 of these projects also revealed interesting trends. For example\, the analysis found that simple mistakes were least common: only 26% of projects introduced such an error. Conversely\, vulnerabilities arising from a misunderstanding of security concepts were significantly more common: 84% of projects introduced at least one such error. Overall\, our results have implications for improving secure-programming language choices\, API designs\, API documentation\, vulnerability-finding tools\, and security education.\n\nThis is joint work with James Parker\, Andrew Ruef\, Dan Votipka\, Kelsey Fulton\, Matthew Hou\, Michelle Mazurek\, and Dave Levin\, all at the University of Maryland
URL:https://seasevents.nmsdev7.com/event/cis-seminar-contesting-secure-development-to-understand-security-mistakes/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T150000
DTEND;TZID=America/New_York:20191106T160000
DTSTAMP:20260408T112303
CREATED:20190729T192322Z
LAST-MODIFIED:20190729T192322Z
UID:10006251-1573052400-1573056000@seasevents.nmsdev7.com
SUMMARY:CBE Seminar: "Tailoring Processes and Assembly of Nanomaterials for Electrochemical Energy Storage”
DESCRIPTION:Abstract: \nDespite their promise to mitigate many problems and offer new opportunities in energy storage systems\, nanomaterials have proven to be difficult to tailor and preserve their assembly throughout manufacturing processes when a scale-up is considered. My group has been working on understanding and modification of instability-driven processes to devise scalable manufacturing processes such as gas-assisted electrospinning and air-controlled electrospray\, which can also provide the tailored assembly of nanomaterials. I will show several examples of using these processes to assemble various nanomaterials in the development of next generation battery materials\, including: 1) thermally stable\, non-flammable polymer/ceramic hybrid separator and high capacity silicon/graphene anode for high performance Li-ion batteries; and 2) graphene coated separator and highly loaded\, layered sulfur/graphene cathode for high rate Li-sulfur batteries.
URL:https://seasevents.nmsdev7.com/event/cbe-seminar-tailoring-processes-and-assembly-of-nanomaterials-for-electrochemical-energy-storage/
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T153000
DTEND;TZID=America/New_York:20191106T163000
DTSTAMP:20260408T112303
CREATED:20191004T184556Z
LAST-MODIFIED:20191004T184556Z
UID:10006310-1573054200-1573057800@seasevents.nmsdev7.com
SUMMARY:Herman P. Schwan Distinguished Lecture: "Engineering human tissues for medical impact"
DESCRIPTION:The classical paradigm of tissue engineering involves the integrated use of human stem cells\, biomaterial scaffolds (providing a structural and logistic template for tissue formation) and bioreactors (providing environmental control\, dynamic sequences of molecular and physical signaling\, and insights into the structure and function of the forming tissues). This “biomimetic” approach results in an increasingly successful representation of the environmental milieu of tissue development\, regeneration and disease. Living human tissues are now being engineered from various types of human stem cells\, and tailored to the patient and the condition being treated. A reverse paradigm is now emerging with the development of the “organs on a chip” platforms for modeling of integrated human physiology\, using micro-tissues that are derived from human iPS cells and functionally connected by vascular perfusion. In all cases\, the critical questions relate to our ability to recapitulate the cell niches\, using bioengineering tools. To illustrate the state of the art in the field and reflect on the current challenges and opportunities\, this talk will discuss: (i) anatomically correct bone regeneration\, (ii) bioengineering of the lung\, (iii) heart repair by a cell-free therapy\, and (iv) the use of “organs on a chip” for patient-specific studies of human physiology\, injury\, healing and disease. \nFunding: NIH\, NSF\, New York State\, Mikati Foundation\, Schwartz Foundation \nCatered reception to follow.
URL:https://seasevents.nmsdev7.com/event/schwan-lecture-engineering-human-tissues-for-medical-impact/
LOCATION:Glandt Forum\, Singh Center for Nanotechnology\, 3205 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Distinguished Lecture
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191107T104500
DTEND;TZID=America/New_York:20191107T114500
DTSTAMP:20260408T112303
CREATED:20191028T143224Z
LAST-MODIFIED:20191028T143224Z
UID:10006324-1573123500-1573127100@seasevents.nmsdev7.com
SUMMARY:MSE Seminar: "Why Industrial Research Is Critical: A Brief History in the 20th and 21st Centuries"
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/mse-seminar-why-industrial-research-is-critical-a-brief-history-in-the-20th-and-21st-centuries/
LOCATION:Auditorium\, LRSM Building\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191108T140000
DTEND;TZID=America/New_York:20191108T150000
DTSTAMP:20260408T112303
CREATED:20190923T140853Z
LAST-MODIFIED:20190923T140853Z
UID:10006297-1573221600-1573225200@seasevents.nmsdev7.com
SUMMARY:PICS Seminar: "Mathematical Modeling of Thrombin-Fibrin Binding Dynamics"
DESCRIPTION:Abstract: Blood clot formation involves the coupled processes of platelet aggregation and coagulation\, which are triggered when there is break in a blood vessel. Platelet aggregation is largely a physical process while coagulation is biochemical\, consisting of a large network of reactions that culminate in the generation of the enzyme thrombin. Thrombin cleaves fibrinogen into fibrin\, which polymerizes into fibers to form a stabilizing gel matrix in and around growing platelet aggregates. Thrombin also (re)binds directly to fibrin but this interaction\, and its purpose\, is not fully understood. Thrombin-fibrin binding is often described as two independent\, single-step binding events\, one high-affinity and one low-affinity\, each through a different exosite on thrombin. However\, kinetic schemes describing these single-step binding events with reported kinetic rate constants cannot explain experimentally-observed residency times of fibrin-bound thrombin. In this work\, we study a bivalent\, sequential-step binding scheme as an alternative to the high-affinity event\, and in addition to the low-affinity one. We developed mathematical models for the single- and sequential-step schemes consisting of reaction-diffusion equations to compare to each other and to previously published experimental data. We then used Bayesian inference\, in the form of Markov Chain Monte Carlo\, to learn model parameter distributions from the experimental data. For the model to best fit the data\, we needed an additional assumption that thrombin was irreversibly sequestered; we hypothesized that this could be due to thrombin becoming physically trapped within fibrin fibers as they formed. We also discuss how our model can be used to further probe scenarios dealing with thrombin allostery.
URL:https://seasevents.nmsdev7.com/event/pics-seminar-mathematical-modeling-of-thrombin-fibrin-binding-dynamics/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
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