Bulletin of the American Physical Society
2019 Annual Spring Meeting of the APS Ohio-Region Section
Volume 64, Number 7
Friday–Saturday, March 29–30, 2019; The College of Wooster in Wooster, Ohio
Session A01: Plenary Talks I and II |
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Chair: John F. Lindner, The College of Wooster Room: Wishart Hall 001 (Lean Lecture Hall) |
Friday, March 29, 2019 1:15PM - 2:00PM |
A01.00001: Consider the Icicle Invited Speaker: Stephen Morris Icicles are harmless and picturesque winter phenomena, familiar to anyone who lives in a cold climate. The shape of an icicle emerges from a subtle feedback between ice formation, which is controlled by the release of latent heat, and the flow of water over the evolving shape. Ideal icicles are predicted to have a universal "platonic" shape, independent of growing conditions. In addition, many natural icicles exhibit a ripply texture, which is the result of a morphological instability. The wavelength of the ripples is also remarkably independent of the growing conditions. Similar shape and ripple phenomena are also observed on stalactites, although certain details of their formation differ. We built a laboratory icicle growing machine to explore icicle physics. We learned what it takes to make a platonic icicle and the surprising origin of the ripples. The results of this study are available online in a giant open access database called the Icicle Atlas.\\ \\ In collaboration with: Antony Szu-Han Chen (SAIT) and John Ladan (University of Toronto). [Preview Abstract] |
Friday, March 29, 2019 2:00PM - 2:45PM |
A01.00002: Galaxies across cosmic time - What shapes galaxies and their evolution? Invited Speaker: Swara Ravindranath Galaxies are the basic building blocks of the observable Universe, exhibiting a wide range of shapes, and varying by orders of magnitude in their mass and size. Over cosmic time, galaxies have undergone significant metamorphosis driven by a variety of physical processes, which include gas accretion, star formation, and feedback effects. In dense environments, galaxy interactions and mergers can completely transform the morphology and internal properties of galaxies. The presence of supermassive black holes at their centers also influences the growth of galaxies. The progress in our understanding of galaxy formation and evolution is the result of ambitious observational surveys done with the Hubble Space Telescope, and some of the largest ground-based telescopes. The interpretation of these observations are aided by extensive cosmological simulations that incorporate the detailed physics that govern galaxy growth and assembly. In this talk, I will give an overview of how the various physical processes affect galaxy evolution, and highlight some of the missing pieces of the puzzle of galaxy transformations. [Preview Abstract] |
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