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  • CSP Lunch Seminar Sep 28, 2021

    Quantum Algorithm for Wang-Landau Sampling - Part II

    Guest: Garrett Floyd, Center for Simulational Physics, University of Georgia
    Tuesday, September 28, 2021 12:45 pm - 1:45 pm
    Location: Zoom Meeting

  • Departmental Colloquium Sep 30, 2021

    Chronicles of the Unknown: Webb Science across the Universe into the Solar System

    Guest: Dr. Stefanie N. Milam, NASA Goddard Space Flight Center, Astrochemistry Laboratory
    Thursday, September 30, 2021 3:55 pm - 4:55 pm
    Location: Zoom Meeting

    In late 2021, scientific innovation will take the next step into space exploration and journey. The James Webb Space Telescope (sometimes called JWST or Webb), an orbiting infrared observatory that will complement and extend the discoveries of the Hubble Space Telescope but with longer wavelength coverage and greatly improved sensitivity, will launch into space on an Ariane 5 rocket from French Guiana. Webb will be the premier observatory of the next decade, serving thousands of astronomers and planetary scientist worldwide. It will study every phase in the history of our Universe, ranging from the first luminous glows after the Big Bang, to the formation of solar systems capable of supporting life on planets like Earth, to the evolution of our own Solar System. The discovery space for small bodies in the Solar System with Webb is unprecedented and will reveal new insights to planetesimal formation, composition, and distribution. Physically characterizing planetesimals throughout the solar system is often challenging via remote observations because of their combination of dark surfaces, extreme distances, and some diagnostic spectral features only distinguishable beyond Earth’s atmosphere. JWST's discoveries for these small bodies are expected to reveal the presence of previously unseen molecular gases and ices, constrain their physical state (e.g., crystalline phase and grain-size), and measure isotopic ratios of volatile elements (H, O, C, N). Additionally, imaging at longer wavelengths can be used to study temperature variations on larger bodies (Parker et al. 2016). In this talk, I will provide a status update of the Webb Telescope, briefly review the main science themes for JWST, and conclude with anticipated science from JWST's exploration of the objects in our Solar System, namely small bodies.

  • Special Colloquium Oct 1, 2021

    Millimeter/submillimeter spectroscopic detection of desorbed ices

    Guest: Stephanie Milam, NASA Goddard Space Flight Center, Astrochemistry Laboratory
    Friday, October 1, 2021 10:20 am - 11:20 am
    Location: Room 322, Zoom Meeting

  • CSP Lunch Seminar Oct 5, 2021

    3D Radiative transfer & Phoenix/3D

    Guest: Peter Hauschildt, Department of Physics, University of Hamburg, Germany
    Tuesday, October 5, 2021 12:45 pm - 1:45 pm
    Location: Zoom Meeting

  • CSP Lunch Seminar Oct 12, 2021

    Simulation of quantum many-body systems with tensor networks

    Guest: Glen Evenly, School of Physics, Georgia Institute of Technology
    Tuesday, October 12, 2021 12:45 pm - 1:45 pm
    Location: Zoom Meeting

  • Departmental Colloquium Oct 14, 2021

    Breaking Speed and Resolution Limitations of AFM

    Guest: Prof. Simon Scheuring, Weill Cornell Medicine, Department of Anesthesiology, Department of Physiology and Biophysics, New York
    Thursday, October 14, 2021 3:55 pm - 4:55 pm
    Location: Zoom Meeting

    High-speed atomic force microscopy (HS-AFM) is a powerful technique that provides dynamic movies of biomolecules at work. We successfully used HS-AFM to take movies – and determine dynamic parameters – of membrane trafficking systems such as ESCRT-III and clathrin, transporters and channels.

    To break current temporal limitations to characterize molecular dynamics using HS-AFM, we developed HS-AFM height spectroscopy (HS-AFM-HS), a technique whereby we oscillate the HS-AFM tip at a fixed position and detect the motions of the molecules under the tip. This gives sub- nanometer spatial resolution combined with microseconds temporal resolution of molecular fluctuations. HS-AFM-HS can be used in conjunction with HS-AFM imaging modes, thus giving access to a wide dynamic range.

    To break current resolution limitations, we developed Localization AFM (LAFM). By applying localization image reconstruction algorithms to peak positions in high-speed AFM and conventional AFM data, we increase the resolution beyond the limits set by the tip radius and reach quasi-atomic resolution on soft protein surfaces in native and dynamic conditions. The LAFM method allows the calculation of high-resolution maps from either images of many molecules or many images of a single molecule acquired over time, opening new avenues for single molecule structural analysis.

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