Bulletin of the American Physical Society
2017 Annual Spring Meeting of the APS Ohio-Region Section
Volume 62, Number 6
Friday–Saturday, May 5–6, 2017; Ypsilanti, Michigan
Session B3: Contributed Posters: Computational Physics and Condensed Matter |
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Chair: David Pawlowski, Eastern Michigan University Room: Pray-Harrold 217 |
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B3.00001: Refining emission line fitting in NGC 4552 for black hole mass determination Shota Hodono, Jason Pinkney The elliptical galaxy NGC 4552 is about 15.6 Mpc away and shows signs of nuclear activity. A supermassive black hole (BH) is surely present, but a secure BH mass is not yet published for this galaxy. A dataset from the Space Telescope Imaging Spectrograph (STIS) shows promise for providing a BH mass using the gas kinematics method. Here we report on the emission line fitting which is a prerequisite for the gas kinematical modelling. We fit gaussians to the lines using chi-squared minimization. For some of the spectral extractions the fitting is problematic because of either noise, non-gaussian line profiles, or a strong blending of narrow lines with broad lines from the active nucleus. We present our final rotation curves which look consistent with a disk of excited gas rotating about a central dark mass. [Preview Abstract] |
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B3.00002: Effects of the Burkert Dark Matter Density Profile on Dwarf Spheroidal Galaxies Alexander Staron, Benjamin Amend, Michael Zito, Stephen Alexander We present a computational model for calculating the motion of stars in Milky Way dwarf spheroidal galaxies (dSphs) using distributions of baryonic and dark matter. We explicitly calculate the motion of nearly ten-thousand stars in a spherically symmetric gravitational potential. We utilize a Burkert dark matter halo and a Hernquist density profile to model the distributions of dark and baryonic matter respectively. From our simulation, we statistically obtain both the line-of-sight bulk velocity dispersion and dispersion profile for “classical” Milky Way dSphs. We compare our data with the observations of Walker et al. and the results presented in Salucci et al. We will also compare our data with the Modified Newtonian Dynamics (MOND) calculations made previously with our simulation in Alexander et al. [Preview Abstract] |
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B3.00003: Effects of Solar Irradiance on the Atmosphere of Mars Jonah Pollens-Dempsey The MAVEN spacecraft has been in orbit around Mars for more than two years.~This study focuses on variability in the neutral density observations obtained by MAVEN's accelerometer between February 2015 and April 2016. The main objective has been to quantify the correlation of these measurements with the solar irradiance, one of the main inputs to the Mars upper atmosphere. The correlation was examined for several short periods when the spacecraft was orbiting on the planet's dayside. The results indicate that Mars's upper atmosphere is more often under solar control when the radiation input from the Sun is more significant. [Preview Abstract] |
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B3.00004: One-Dimensional Photochemical Model of Mars's Upper Atmosphere Andrew Richardson The goal of this study is to create a one-dimensional photochemical computer model of Mars's upper atmosphere. With this model, we hope to be able to study the effects of solar variability on the upper atmosphere. Simulations will be performed that look at the ionization processes that shape the atmosphere and how the atmospheric composition changes. I will present on the early stages of computational model building and an overview of my model. [Preview Abstract] |
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B3.00005: Superconducting properties of Zr-doped Ni$_{\mathrm{2}}$ZrGa$_{\mathrm{1-}}_{x}$Ge$_{x}$ Heather Statt, Ben Amend, Adam Coon, Rebeca Garcia De Jesus, Sam George, Abby Hurley, Kefeng Jiang, Micah Morris, Nick Porter, Jayson Rook, Yukun Wang, Ziwei Zhang, Tiago Schaeffer, Saad Alzahrani, Jeffrey Brock, Mahmud Khan ZrNi$_{\mathrm{2}}$Ga is a Heusler compound of AB$_{\mathrm{2}}$C formula that exhibits type-II superconductivity with a critical temperature of 2.9 K. The critical temperature of this compound has been attributed to its valence electron concentration of 6.75. It is interesting to investigate the effect of increased valence electron concentration on the critical temperature. In light of this, we have performed an experimental investigation on a series of Ni$_{\mathrm{2}}$ZrGa$_{\mathrm{1-}}_{x}$Ge$_{x}$ Heusler alloys by means of X-ray diffraction, magnetization, and electrical resistivity measurements. All alloys were found to primarily crystallize in the L2$_{\mathrm{1}}$ cubic structure at room temperature, with some secondary phases in samples with $x$ \textgreater 0.15. The magnetization and electrical resistivity measurements revealed that all samples exhibit type-II superconductivity despite the increase in structural disorder across the series, and that the critical temperature decreases with Ge content. The experimental results and conjectures as to the role of Ge in determining the superconducting properties will be discussed. [Preview Abstract] |
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B3.00006: Reaction-Diffusion Waves and Obstacles: Influence on Wave Speed Alexander Gould, Niklas Manz We analyzed the effect of various sized rhombuses and elliptical obstacles on the propagation speed of reaction-diffusion waves. Through numerical simulations with a cellular automaton we found that the obstacle size has an influence on the wave speed of the reaction diffusion waves whereas no difference was found between rhombuses and ellipses of the same size. To create simulations similar to real wave behavior of the chemical model system, the Belousov-Zhabotinsky reaction, required operations with the standard, squared-cell cellular automata method which seemed to be non-physical. Therefore, we introduced a hexagonal structure to produce results which are more physically accurate to be comparable with planed experimental work. [Preview Abstract] |
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