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  • Mar
    9

    John Gemmer, Ph.D., Wake Forest University

    McCormick-Engineering Sciences and Applied Mathematics

    4:00 PM M416, Technological Institute

    EVENT DETAILS

    Title: Why is Lettuce So Wrinkly?

    Speaker: John Gemmer, Ph.D., Wake Forest University

    Abstract: Many patterns in Nature and industry arise from the system minimizing an appropriate energy. Torn plastic sheets and growing leaves provide striking examples of pattern forming systems which can transition from single wavelength geometries (leaves) to complex fractal like shapes (lettuce). These fractal like patterns seem to have many length scales -the same amount of extra detail can be seen when looking closer (“statistical self-similarity”). It is a mystery how such complex patterns could arise from energy minimization alone. In this talk I will address this puzzle by showing that such patterns naturally arise from the sheet adopting a hyperbolic non-Euclidean geometry. However, there are many different hyperbolic geometries that the growing leaf could select. I will show using techniques from analysis, differential geometry and numerical optimization that the fractal like patterns are indeed the natural minimizers for the system.

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    TIME Monday, March 9, 2020 at 4:00 PM - 5:00 PM

    LOCATION M416, Technological Institute    map it

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    CONTACT Meelee Ahn Park    meelee.park@northwestern.edu EMAIL

    CALENDAR McCormick-Engineering Sciences and Applied Mathematics

  • Sep
    23

    Welcome & Luncheon for New Full-time Graduate Students

    McCormick School of Engineering and Applied Science

    11:00 AM Ryan Auditorium, Technological Institute

    EVENT DETAILS

    TIME Monday, September 23, 2024 at 11:00 AM - 12:30 PM

    LOCATION Ryan Auditorium, Technological Institute    map it

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    CONTACT Andi Joppie    andi.joppie@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Sep
    24

    Fall 2024 Classes Begin (No Northwestern Monday in Fall)

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Tuesday, September 24, 2024

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    30

    Last day to add a class or change a section for Fall (Last day for tuition adjustment related to enrollment changes (to or from full-time). No reductions are made to bills for dropped or swapped classes after this date)

    University Academic Calendar

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    EVENT DETAILS

    TIME Monday, September 30, 2024

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Dec
    7

    Fall classes end

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Saturday, December 7, 2024

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar